HJ 2027-2013Technical specifications of catalytic combustion method for industrial organic emissions treatment project (English PDF)

3.1 Industrial organic emissions

Refers to gaseous pollutants containing volatile organic compounds emitted by industrial processes.

3.2 Explosion limit explosive limit

Also known as the explosive concentration limit. The concentration range in which a combustible gas or vapor can be exploded after mixing with air is called the explosion limit.

3.3 Lower explosive limit lower explosive limit

Refers to the lowest concentration value of the explosion limit.

3.4 Oxidation catalyst

Refers to a catalyst that catalyzes the oxidation of organic compounds by catalysis.

3.5 Heat storage heat regenerator

Refers to a structure that contains a relatively porous hole, utilizes the structure and specific surface area of the hole, and combines the material of the material itself to achieve heat storage and exchange function.

Inorganic non-metallic solid materials.

3.6 Catalyst poisoning catalyst poisoning

Refers to the phenomenon that the catalytic activity of the catalyst is degraded or lost due to the action of certain substances.

3.7 Catalytic burner catalytic oxidizer

Refers to the use of solid catalysts to convert pollutants in the exhaust gas into compounds such as carbon dioxide and water through oxidation, and to purify pollutants in the exhaust gas.

Equipment and its ancillary facilities. Catalytic combustion devices typically consist of a catalytic reaction chamber, a heat exchange chamber, and a heating chamber.

3.8 Conventional catalytic combustion device

Refers to a catalytic combustion device that uses a gas-gas heat exchanger for indirect heat exchange.

3.9 Regenerative catalytic oxidizer (RCO)

Refers to a catalytic combustion device that uses a regenerative heat exchanger for direct heat exchange, referred to as RCO.

3.10 Ignition temperature

Refers to the temperature at the inlet of the catalytic reactor when the conversion rate of a certain pollutant reaches 50%.

3.11 Self-sustained combustion

Refers to the heat generated by the catalytic combustion of organic matter in the exhaust gas to maintain the reaction temperature of the catalyst bed, or the temperature of the exhaust gas itself.

The light-off temperature of the catalyst has been reached or exceeded without the need for a catalytic combustion process to preheat the exhaust gases.

3.12 Space velocity

Refers to the volumetric flow rate of exhaust gas per unit volume of catalyst treated per unit time, called space velocity, referred to as space velocity. The unit is. m3/(h·m3), Abbreviated as h-1.

3.13 Purification efficiency

Refers to the ratio of the amount of contaminant captured by the purification equipment to the amount of contaminant before treatment, expressed as a percentage. Calculated as follows.

2211 ×-=

Snsn

QCQCeta

In the formula.

eta--purification efficiency of purification equipment,%;

C1, C2 - concentration of pollutants at the inlet and outlet of the purification equipment, mg/m3;

Qsn1, Qsn2 - dry gas flow rate at the inlet and outlet of the purification equipment, m3/h.

5.1 General provisions

5.1.1 The governance project shall meet the requirements of the Environmental Protection Design Regulations for Construction Projects and the Environmental Protection Management Regulations for Construction Projects.

5.1.2 The governance project should follow the principles of comprehensive management, recycling, emission standards, and total amount control. Governance process design should be mature Relying on advanced technology and economical application principles, and considering energy saving, safety, and easy operation, the main process flow is determined.

5.1.3 The treatment project should be compatible with the production process level, and the production enterprise should manage the treatment equipment as part of the production system.

The equipment should operate in synchronism with the corresponding production equipment that produces the exhaust.

5.1.4 The discharged pollutants after treatment shall comply with the national or local relevant air pollutant discharge standards.

5.1.5 The treatment and discharge of waste gas, waste water, waste residue and other pollutants generated during the construction and operation of the treatment project shall be implemented in the country.

Or local environmental protection regulations and standards to prevent secondary pollution.

5.1.6 Governance engineering shall install online continuous monitoring equipment in accordance with the requirements of relevant national laws and regulations.

5.2 Engineering composition

5.2.1 The governance project consists of the main project and the auxiliary project.

5.2.2 Main works usually include exhaust gas collection, pretreatment and catalytic combustion units. If secondary pollutants are produced during the treatment process, they should also include Secondary pollutant treatment facilities.

5.2.3 Auxiliary works include inspection and process control, electrical instrumentation and water supply and drainage.

5.3 Site selection and general layout

5.3.1 Site selection and general layout should be carried out in accordance with the provisions of the standard GB 50187.

5.3.2 Site selection should follow the principles of convenient construction, operation and maintenance, and leave fire exits and safety protection distances in accordance with fire protection requirements.

5.3.3 The arrangement of the treatment equipment should consider the influence of the dominant wind direction to reduce the environmental impact of harmful gases and noise.

5.3.4 Catalytic combustion equipment should be kept away from the storage place of flammable and explosive hazardous chemicals, and the safety distance should meet the national or relevant industry standards.

6.1 General requirements

6.1.1 The treatment capacity of the treatment project should be determined according to the treatment volume of the exhaust gas, and the design air volume should be designed according to 120% of the maximum exhaust gas emissions.

6.1.2 The purification efficiency of the catalytic combustion device shall not be less than 97%.

6.1.3 The design of the exhaust pipe should meet the requirements of GB 50051.

6.2 Selection of process routes

6.2.1 The process route should be selected based on comprehensive analysis of the source, properties (temperature, pressure, composition) and flow rate of the exhaust gas.

6.2.2 According to the different heating methods of exhaust gas, the catalytic combustion process can be divided into the conventional catalytic combustion process (see Figure 1) and the thermal storage catalytic combustion.

Process (see Figure 2).

Figure 1 Conventional catalytic combustion process

Figure 2 Regenerative catalytic combustion process

6.2.3 The heat balance calculation should be performed when selecting the catalytic combustion process. When the organic matter contained in the exhaust gas is burned, the heat generated can be dimensionally when the catalyst bed is self-sustained, the conventional catalytic combustion process should be adopted; when the organic matter contained in the exhaust gas is burned, the heat generated cannot be when the catalyst bed self-sustaining combustion is maintained, a regenerative catalytic combustion process is preferably employed.

6.3 Process design requirements

6.3.1 Exhaust gas collection

6.3.1.1 The design of the exhaust gas collection system shall comply with the provisions of GB 50019.

6.3.1.2 Exhaust gas should be coordinated with the production process and should not affect the process operation. Under the premise of ensuring the collection ability, the structure should be simplified.

Single, easy to install and maintain management.

6.3.1.3 When determining the position, structure and gas flow rate of the suction port of the collector hood, the hood shall be in a state of micro-negative pressure and the negative pressure inside the hood shall be uniform.

6.3.1.4 The suction direction of the gas collecting hood should be as consistent as possible with the direction of the moving airflow to prevent the airflow around the suction hood from being disordered, avoiding or reducing the influence of weak interference airflow and air supply airflow on the intake airflow.

6.3.1.5 When there are many exhaust gas generation points and they are far away from each other, multiple collection systems should be appropriately divided.

6.3.2 Pretreatment

6.3.2.1 The pretreatment equipment shall be selected according to the composition, nature and content of the pollutants.

6.3.2.2 When the content of particulate matter in the exhaust gas before entering the catalytic combustion device is higher than 10 mg/m3, it shall be pretreated by filtration or the like.

6.3.2.3 A differential pressure gauge shall be installed at both ends of the filter device. When the resistance of the filter exceeds the specified value, the filter material shall be cleaned or replaced in time.

6.3.2.4 When the concentration of organic matter in the exhaust gas is high, it should be adjusted to meet the requirements of 4.1 by dilution.

6.3.3 Catalytic combustion

6.3.3.1 The working temperature of the catalyst should be lower than 700 ° C, and can withstand high temperature impact of 900 ° C for a short time. Catalyst life under design conditions the life should be greater than 8500h.

6.3.3.2 The service life of the thermal storage body in the regenerative catalytic combustion device under design conditions shall be greater than 24000 h.

Combustion chamber I Combustion chamber II

6.3.3.3 The design space velocity of the catalytic combustion device should be greater than 10000h-1, but should not be higher than 40,000h-1.

6.3.3.4 The temperature of the gas entering the combustion chamber shall reach the light-off temperature of the gas component on the catalyst, and the mixed gas shall have the highest light-off temperature.

The composition is determined.

6.3.3.5 The pressure loss of the catalytic combustion unit shall be less than 2 kPa.

6.3.3.6 The high temperature flue gas generated after treatment should be recycled.

6.4 Secondary pollution control

6.4.1 Waste water from waste gas pretreatment should be treated centrally and discharged after meeting the corresponding discharge standards.

6.4.2 The dust and waste residue from pretreatment and the replacement of the filter material and catalyst shall be treated in accordance with the National Solid Waste Treatment and Disposal Office.

Relevant regulations.

6.4.3 When secondary pollutants are generated after catalytic combustion, they should be treated by absorption and other methods to achieve standard discharge.

6.4.4 Noise control shall meet the requirements of GB J 87 and GB 12348.

6.5 Security measures

6.5.1 The treatment system shall have an automatic alarm device for accidents and comply with the relevant provisions on safety production and accident prevention.

6.5.2 The pipe system between the treatment system and the main production device shall be equipped with a flame arrester (fire damper). The performance of the flame arrester shall be in accordance with HJ/T Inspection is carried out in accordance with 5.4 of 389-2007.

6.5.3 Fans, motors and electrical instruments placed on site shall not be lower than the explosion-proof rating of the site.

6.5.4 The concentration dilution facility should be set up before the exhaust fan. When the reactor outlet temperature reaches 600 ° C, the control system should be able to alarm and automatically open the waste flushing facility dilutes the exhaust gas.

6.5.5 The catalytic combustion device shall have an overheat protection function.

6.5.6 The catalytic combustion device shall be insulated as a whole, and the external surface temperature shall not be higher than 60 °C.

6.5.7 The explosion-proof pressure relief design of the piping system and catalytic combustion equipment shall comply with the requirements of GB 50160.

6.5.8 The treatment equipment shall have short-circuit protection and grounding protection function, and the grounding resistance shall be less than 4ohm.

6.5.9 Fire-fighting facilities should be installed near the catalytic combustion unit.

6.5.10 The outdoor catalytic combustion device shall be installed with lightning protection devices in accordance with GB 50057.

8.1 Testing

8.1.1 The treatment equipment shall be provided with a permanent sampling port. The sampling port shall be set in accordance with HJ/T 1. The sampling method shall meet the requirements of GB/T 16157.

The sampling frequency and test items should be determined according to process control requirements.

8.1.2 A multi-point temperature detecting device with automatic alarm function shall be installed in the heating chamber and the reaction chamber of the catalytic combustion device. Temperature Sensor it should be used after calibration according to JJF 1049.

8.2 Process Control

8.2.1 The treatment project should be started before the production process equipment that produces the exhaust gas, and then stopped in the production process equipment, and realize the chain control.

8.2.2 On-site control should be set up on site to achieve local control. The local control cabinet should have a centralized control port with a connection to the centralized control room Function, in the control cabinet shows the operating status of the device.

9.1 Electrical system

9.1.1 The power supply system can be directly connected to the production main engineering power distribution system, and the neutral point grounding method should be consistent with the production main project.

9.1.2 The electrical system design should meet the requirements of GB 50058.

9.2 Water supply, drainage and fire protection systems

9.2.1 The water supply and drainage design of the treatment project shall comply with the relevant provisions of the relevant industrial water supply and drainage design specifications.

9.2.2 The fire protection design of the treatment project shall be incorporated into the overall design of the fire protection system of the plant.

9.2.3 Fire exits, fire separation, safe evacuation design and fire hydrant arrangements shall comply with the provisions of GB 50016.

9.2.4 The treatment project shall be equipped with a mobile fire extinguisher in accordance with the provisions of GB 50140.

10.1 Engineering Construction

10.1.1 The engineering design and construction unit shall have the corresponding national engineering design and construction qualifications.

10.1.2 The construction of the project shall comply with the requirements of the national and industrial construction procedures and management documents.

10.1.3 The construction of the project shall be carried out according to the design documents. The change of the project shall be carried out after obtaining the design change document of the engineering design unit.

work.

10.1.4 The equipment, materials and components used in the construction shall comply with the corresponding national standards.

10.1.5 Construction and acceptance of equipment, piping and fittings that require corrosion-resistant materials shall be in accordance with HGJ 229.

10.1.6 In addition to complying with relevant construction technical specifications, the construction unit shall also abide by the labor safety and environmental protection issued by the relevant state departments.

Requirements for mandatory standards such as sanitation and fire protection.

10.2 Project Acceptance

10.2.1 The acceptance of the project shall be organized in accordance with the "Measures for Completion and Acceptance of Construction Projects (Engineering)".

10.2.2 After the installation and construction of the project, the relevant instruments and meters should be verified first, and then the sub-programming and overall according to the process flow.

debugging.

10.2.3 Through the overall commissioning, each system is operating normally, and the technical indicators meet the design and contract requirements before starting the trial operation.

10.3 Completion of environmental protection acceptance

10.3.1 The acceptance of environmental protection for completion shall be carried out in accordance with the provisions of the "Administrative Measures on Environmental Protection Acceptance for Completion of Construction Projects".

10.3.2 The project before the acceptance of the project shall be tested and performance tested. The contents of the performance test mainly include.

a) the concentration of contaminants at the import and export of non-methane total hydrocarbons in the exhaust gas and national or local relevant emission standards (at least three times);

b) air volume;

c) purification efficiency of the catalytic combustion unit;

d) system pressure drop;

e) Power consumption or gas consumption.

11.1 General requirements

11.1.1 The treatment equipment shall be operated in synchronism with the production process equipment that produces the exhaust gas. The treatment equipment is stopped due to accidents or equipment mainte...