HJ 2028-2013General technical specification for electrostatic precipitation engineering (English PDF)

3.1 Electrostatic precipitator electrostatic precipitator

Refers to the dust collector that uses the high-voltage electric field to adsorb the charged dust and separate the dust from the dust-containing gas.

3.2 Design efficiency design collection efficiency

Refers to the theoretical dust removal efficiency of the precipitator calculated according to the following formula.

QAe/1 ---= omegaeta (1) where. eta-dust removal efficiency, %;

Q-dust flow, m3/s;

A- total dust collection area, m2;

ohm-drive speed, m/s.

3.3 Ensure efficiency collection efficiency

Refers to the guaranteed dust removal efficiency guarantee value agreed upon in the contract.

3.4 Dust specific resistance dust resistivity

Refers to the resistance value of the dust per unit area at unit thickness, in ohm·cm.

3.5 Specific collection area

Refers to the dust collection area to which the dust flow gas per unit flow is distributed. It is equal to the ratio of the dust collection area to the flow rate of the dust-containing gas.

The bit is m2/m3/s.

3.6 Flue gas tempering ash adjustive

A process for injecting a chemical tempering agent into the flue gas to improve the specific resistance of the flue gas.

3.7 Standard State Standard State

Refers to the state where the gas temperature is 273K and the pressure is 101325Pa, which is referred to as "standard state".

4.1 Contaminants

4.1.1 The specific resistance of dust-containing gas dust suitable for electrostatic precipitator treatment is generally 1×104~1×1013ohm·cm. When the specific resistance is too high when the dust-containing gas can be quenched and tempered, or the dust collection area is increased, the electrical performance is improved, and the new technology of the rotating plate is adopted.

And other measures to ensure dust removal efficiency.

4.1.2 The temperature of the dust-containing gas at the inlet of the electrostatic precipitator should be less than or equal to 400 °C. When the temperature of the dust-containing gas is higher than the upper limit, it should be taken.

Take cooling measures.

4.1.3 The dust concentration of the dust-containing gas at the inlet of the electrostatic precipitator should be less than or equal to 50g/m3. Pre-dusting should be set above the upper limit facility.

4.1.4 The main application areas of electrostatic precipitators include.

a) Power industry. boiler flue gas dedusting;

b) Metallurgical industry. sintering machine head, sintering machine tail, ironmaking blast furnace gas, steelmaking converter gas, whole grain, screening, Ducts and other stations and environmental dust removal;

c) Building materials industry. kiln head, kiln tail, coal mill and other dusting points;

d) Chemical industry. acid production;

e) Paper industry. alkali recovery;

f) Other industries. industrial boiler flue gas dedusting, special industrial furnace, dusty exhaust particulate matter recovery, air purification Wait.

4.2 Pollution load

4.2.1 should understand the basic conditions and requirements of production process, equipment, work system, maintenance and repair, and master the discharge of pollutants Causes, types and physical and chemical properties, location and quantity, emission patterns and pathways, emissions and emission intensity, emission regulations Law, etc., as the original data and basis of engineering design.

4.2.2 Conduct a comprehensive and in-depth investigation of pollution sources, and collect physical and chemical properties of dust-containing gases according to engineering design needs.

The original information mainly includes the following contents.

a) the amount of dusty gas discharged from the pollution source (normal dust content, maximum dust content, minimum dust content);

b) gas temperature and range of variation (maximum temperature, normal temperature, minimum temperature, dew point temperature);

c) dust concentration;

d) gas composition and concentration (SO2, NOX, O2, CO2, CO, etc.);

e) gas pressure and moisture content;

f) dust composition (SiO2, Al2O3, Fe2O3, CaO, MgO, Na2O, K2O, TiO2, P2O5, MnO2 Li2O, SO3, etc.);

g) dust particle size, specific resistance, true density, bulk density, flammability, explosiveness, adhesion, wear, rest Angle, etc.

h) The type, quantity and working system of the equipment that produces the pollutants.

4.2.3 The parameters of dust-containing gas are mainly based on test reports and design data. When the user is unable to provide the raw materials of the dusty gas and the data can be obtained by.

a) commission a professional test unit to conduct the test;

b) analogy of projects of the same type and size;

c) engineering experience and formula calculation;

d) Simulation test.

4.2.4 Design load and design margin should be approved according to pollutant characteristics, pollution intensity, emission standards and environmental impact assessment the requirements of the document are comprehensively determined.

4.2.5 Design load and design margin should fully consider the pollution load in the largest and most unfavorable conditions for the electrostatic precipitator the effect is ensured to ensure stable operation and to ensure design efficiency.

4.2.6 Exhaust volume of pollution source, amount of exhaust gas discharged from production equipment, air volume of inlet and outlet of heat exchanger, air volume treated by electrostatic precipitator, the design and selection of the air volume of the induced draft fan should be calculated according to the working air volume. Performance tests and test results should be performed in a standard state Accounting.

5.1 General provisions

5.1.1 Electrostatic precipitator works shall be designed, manufactured and installed by units with corresponding national qualifications.

5.1.2 The design of the electrostatic precipitator project should adopt mature and stable technology, safe, reliable and economical process and equipment.

5.1.3 The configuration of the electrostatic precipitator project should not be lower than the equipment level of the production process equipment and be included in the production system management. Electric elimination Dust systems and equipment should be able to adapt to changes and fluctuations in the production process and should operate in synchronism with the corresponding production process equipment.

5.1.4 The electric dust removal process, technical level, configuration, automatic control and testing should be compatible with the production process and system of the enterprise.

And in line with the requirements of national technical policies and standards.

5.1.5 The design period of the electric dust removal project should be compatible with the design life of the production process, and the design life of the electrostatic precipitator should not be low.

In 30 years. The main structural parts of the electrostatic precipitator guarantee a service life of 30 years, and the electronic control equipment guarantees a service life of more than 10 years.

5.1.6 The design of voltage and seismic fortification of electric dust removal engineering should meet the requirements of national and industrial design codes and regulations.

5.1.7 The construction scale of the electric dust removal project should be based on the pollution source status, emission standards, technical level, engineering grade, and economic status.

Factors such as conditions and engineering conditions are considered together and the following principles are followed.

a) Master the pollution intensity, quantity, distribution form, etc. of the pollution source, and determine the maximum processing capacity of the electric dust removal system;

b) When the production process may be expanded, the design of the electrostatic precipitator system and the selection of the main equipment should be reserved with appropriate margin.

5.1.8 The construction of electric dust removal project shall take measures to prevent secondary pollution, waste water, waste gas, waste residue, noise and other pollution.

Emissions should be in accordance with appropriate national or local emission standards.

5.1.9 The electric dust removal project shall be in accordance with relevant national policies and regulations, air pollutant discharge standards and local environmental protection departments.

A continuous monitoring system for pollutant discharge is required.

5.1.10 When the electric dust removal project is used to treat flammable and explosive dusty gas, reliable fireproof and explosion-proof measures shall be taken to ensure the dust removal system.

Continuous and stable operation.

5.2 General layout

5.2.1 The general layout of the main equipment, auxiliary facilities, etc. of the electric dust removal project shall comply with GBZ 1, GB J 16, GB 50187 Provisions.

5.2.2 The layout of the flat surface of the electric dust removal project shall save land. Prevent harmful gases, smoke, dust, strong vibrations and high noise the harm of the sound to the surrounding environment.

5.2.3 For new projects, a moderate amount of open space should be reserved. The main equipment should be arranged according to the process of the process, as close as possible to pollution source.

5.2.4 There should be sufficient installation and maintenance space between and around the main equipment of the ESP project to facilitate construction and maintenance.

Maintenance and transportation.

5.2.5 Electrostatic dust removal engineering pipe racks include inlet and outlet flue pipes, ash conveying pipes, cable trays, etc. and their supports. The arrangement of the pipe rack should Meet the following requirements.

a) The clearance height and foundation position of the pipe rack shall not affect transportation, fire fighting and overhaul;

b) should not hinder the natural lighting and ventilation of the building.

5.2.6 The minimum horizontal spacing between pipe racks and buildings and structures shall comply with the provisions of Table A.1 of Appendix A.

5.2.7 The minimum vertical spacing of pipe racks across railways and roads shall be in accordance with Table A.2 of Appendix A.

5.2.8 The indoor floor elevation of the building such as the control room and the top surface elevation of the equipment foundation should be higher than the outdoor ground by 0.15m.

The indoor and outdoor elevation difference of buildings with vehicles entering and leaving is generally 0.15~0.30m; indoor and outdoor height differences without vehicle access can be More than 0.30m.

5.2.9 The main equipment area of the ESP project shall be poured with concrete floor. The site is flat and the slope is generally 0.5~2.0%.

5.2.10 The fire separation distance of the building (structure) shall meet the requirements of GB J 16 . Fire-fighting passages shall be provided around the main equipment.

And meet the requirements of the design specifications.

5.2.11 ESPs that purify flammable and explosive dust should be placed in separate buildings and fireproofed with the plant the distance should meet the requirements of GB 15577 and GB J 16.

6.1 General requirements

6.1.1 The electric dust removal project should be reasonably configured according to the production process and emission requirements. Dust removal system particulate matter emissions should be in line with the country or local air pollutant discharge standards, construction project environmental impact assessment documents and total amount control provisions. Post dust concentration should meet the requirements of GBZ 1, GBZ 2 limits.

6.1.2 The basic components of the electric dust removal project are. collecting hood, electrostatic precipitator body, control device, unloading ash device, dust removal Pipes, fans, chimneys.

6.1.3 The electrostatic precipitator system should adopt a negative pressure system. In special cases, a positive pressure system can be used.

6.2 Process

6.2.1 According to the status and form of the pollution source, the common process of electrostatic precipitator is shown in Figure 1.

a) Negative piezoelectric dust removal process

b) Positive piezoelectric dust removal process

Figure 1 Common ESP process

6.2.2 Electrostatic dust removal process In addition to the basic composition described above, insulation and pipe support should be configured according to the specific conditions of the project.

Auxiliary facilities such as hangers and automatic control monitoring devices.

6.3 Pollution (dust) source control

6.3.1 A gas collecting hood shall be provided for dust-free gas that is not discharged from the organization. The form and arrangement of the gas collecting hood should meet the production operation and inspection Repair requirements.

Dust

gas

ESP

Body

Fan chimney

Unloading

Gas collecting hood

Other pollution

Dyeing

Unit

ESP

Body fan

Unloading

Chimney dusty gas

Conditioner

Gas collecting hood

6.3.2 For production equipment and parts that produce dusty gas, priority should be given to using a closed or exhaust cabinet and keeping it constant.

Negative pressure. When a closed cover is not available or inconvenient, a semi-closed cover or an external collecting hood may be selected according to the production operation requirements, and Surround or close to the source of pollution as much as possible, and if necessary, add a soft curtain enclosure to prevent dust from spilling out. Escape type hot dust the collecting of the body should preferably adopt the top collecting hood; the pollution range is large, and the blowing suction hood can be adopted in the occasion of frequent production operations;

It is not possible to set a fixed collector hood, and in the case of intermittent operation, an active (moving) hood can be used.

6.3.3 The exhaust vent of the collector hood should not be close to the open hole (such as operation hole, observation hole, discharge port, etc.) to avoid inhalation.

Amount of air or material.

6.3.4 The design of the gas collecting hood should fully consider the airflow structure to avoid the dusty airflow passing through the human breathing zone.

6.3.5 When designing the gas collecting hood, the influence of interference airflow such as the wind on the smoke exhausting effect should be considered.

6.3.6 When the outer dimensions and volume of the gas collecting hood and roof collecting hood are large, the hood should be provided with multiple exhaust outlets. Gas collecting hood the shrinkage angle should not be greater than 60°.

6.3.7 The amount of exhaust air from the collector hood shall be determined in accordance with the principle of preventing the diffusion of dust or harmful gases into the environmental space. Exhaust air volume is the working air volume and the exhaust air volume can be obtained by the following methods.

a) production equipment;

b) actual measurement or simulation test;

c) engineering analogy and empirical data;

d) Design manual and theoretical calculations.

6.3.8 The gas collection hood should be able to achieve the collection effect of dusty gas (dust), and the capture rate is not lower than.

a) 100% closed cover;

b) semi-closed cover 95%;

c) blowing the hood 90%;

d) 90% of the roof exhaust hood;

e) 100% control equipment containing toxic, harmful, flammable and explosive sources.

6.3.9 Where the gas collecting hood may enter the debris, the grille shall be provided with a grille.

6.4 Flue gas conditioning

6.4.1 In the coal used in coal-fired boilers, the sulfur...