DL/T 5790-2019Technical specification for flue gas purification plant in thermal power plant (English PDF)

2.0.1 Dust collector

A device or equipment that separates and captures dust from dusty gas.

2.0.2 Wet scrubber

An electric precipitator that separates dust by the washing effect of liquid.

2.0.3 Dust removal efficiency

In unit time, the mass of dust collected by the precipitator accounts for the percentage of the mass of dust entering the precipitator.

2.0.4 Air leakage rate

Under standard conditions, the difference between the outlet gas flow rate and the inlet gas flow rate accounts for the percentage of the inlet gas flow rate.

2.0.5 Dust collector tightness

The gas sealing performance of the precipitator housing is the performance of the precipitator housing to maintain no leakage under operating pressure conditions, and its indicators are often it is expressed as the gas leakage rate when the pressure difference between the inside and outside of the precipitator reaches the specified value when the external flange of the precipitator housing is sealed.

2.0.6 Anode plate

The constituent unit of the anode system is the ground electrode of the electrostatic precipitator. The negatively charged dust moves towards and is adsorbed on it under the action of the electric field force.

2.0.7 Cathode rays

The component unit of the cathode system is set corresponding to the anode plate and is powered by a negative high voltage power supply. An electric field is established in the electrostatic precipitator to ionize the gas into the dust A member that is charged and generates an electric field effect.

2.0.8 Vibrating device

A device that generates shock vibration or jitter to make the dust adsorbed on the pole plate shake off.

2.0.9 the rotation pulse jet bag filter A bag-type dust collector that rotates the injection pipe in a concentric circle and pulses the filter bags arranged in this concentric circle to clean dust.

2.0.10 Pipe type pulse line arrangement spray cleaning dust device

It is a mechanism for pulse blowing and cleaning the filter bag row by row through a fixed nozzle.

2.0.11 Clean flue gas chamber

Clean flue gas chamber after filter bag treatment.

2.0.12 Dust chamber

Dust-containing flue gas warehouse without dust removal treatment.

2.0.13 Reactor

A device that uses selective catalytic reduction (SCR) to remove nitrogen oxides from boiler flue gas.

2.0.14 Flow deflector

A device for uniform airflow distribution in the flue.

2.0.15 Rectifying grille

A relatively uniform device that adjusts the flue gas flowing in the horizontal direction to flow vertically downwards and can integrate the flue gas velocity distribution.

2.0.16 Ash retaining net

Installed on the top of the catalyst to prevent large ash blocks from clogging the catalyst network structure device.

2.0.17 Ammonia injection grid

A grille device used to evenly spray diluted ammonia gas from an ammonia air mixer or a pyrolysis furnace into the flue.

2.0.18 Catalyst

A substance that accelerates the reduction reaction between ammonia gas and NOx in flue gas.

2.0.19 Gaseous ammonia buffer tank

A container equipment that uses the volume of the ammonia storage container to reduce the ammonia pressure fluctuations of the ammonia users.

2.0.20 Urea decomposition device

The equipment used to decompose a certain concentration of urea solution to form gaseous ammonia. The main types are urea hydrolysis reactor and urea pyrolysis furnace.

formula.

2.0.21 Absorber

The equipment that uses physical and chemical methods to remove SO2 in the flue gas is the main monomer equipment in the wet flue gas desulfurization process.

2.0.22 Mist eliminator

In the wet desulfurization process, the equipment used to remove moisture entrained in the wet flue gas.

2.0.23 High Efficiency Dust and Fog Removal Device

By further combining with the demister of the absorption tower, the local turbulence of the flue gas and the improvement of the clean water on the surface of the equipment are enhanced to achieve high-efficiency washing and removal.

Dust, defogging function device.

2.0.24 Booster fan

Equipment set up to overcome the system resistance of the desulfurization device

2.0.25 Wet ball mill

Equipment for preparing granular limestone into limestone slurry of qualified fineness.

2.0.26 Hydro-cycione

It is a monomer equipment that spins out the granular solids in the slurry according to the required size. Used to screen limestone slurry and concentrated gypsum with qualified fineness Slurry.

2.0.27 Lifting technology of cut-off tower

In order to meet the technical transformation requirements of desulfurization, it is necessary to adopt a jacking mode to increase the construction process of the absorption tower after the existing absorption tower is cut and disconnected.

2.0.28 Drying tower

In the zero discharge process of desulfurization wastewater, a drying device that relies on the waste heat of flue gas to achieve further evaporation and concentration of wastewater.

2.0.29 Desulphurization wastewater

The discharge wastewater containing heavy metals, impurities, acids and other substances discharged from the wet desulfurization system during operation.

2.0.30 Double Circulation

In order to improve the desulfurization efficiency, on the basis of the existing first-level flue gas treatment process, a desulfurization process of recirculation for flue gas treatment is performed simultaneously.

2.0.31 Diversion cone

In order to meet the technical requirements of single tower and double circulation, a cone-shaped flue gas diversion device is installed in the upper flue gas zone of the absorption tower.

2.0.32 Collecting bowls

In order to meet the technical requirements of single tower and double circulation, a bowl-shaped device for collecting the secondary reaction slurry is installed on the upper part of the absorption tower.

2.0.33 Desulphurizer

In the flue gas desulfurization system, the reagents used to remove sulfur oxides in the flue gas mainly include limestone, lime powder, soda ash, calcium carbide slag, Magnesium oxide, sea water and ammonia and other substances.

3.1 General rules

3.1.1 The construction unit undertaking the installation of the flue gas purification device of the thermal power plant should have the corresponding capacity; the construction site should have an approved construction organization Technical documents such as design and construction plans; special equipment should be notified to the corresponding government management department before the start of construction.

3.1.2 The construction drawings should be checked by relevant units before installation.

3.1.3 The installation project of the flue gas purification device of the thermal power plant shall be constructed according to the design and equipment technical documents. In addition to complying with this specification, related pumps, pipelines, the welding and other parts of the construction should still comply with the relevant national and industry standards.

1 The installation of pumps, fans and compressors shall comply with the provisions of GB 50275 "Code for Construction and Acceptance of Fans, Compressors and Pump Installation Engineering";

2 The installation of steam pipes and industrial water pipes shall be carried out in accordance with DL/T 5190.5 "Technical Specifications for Construction of Electric Power Part 5: Pipes and Systems", DL/T 1113 "Acceptance Regulations for Pipe Supports and Hangers in Thermal Power Plants" and GB 50235 "Code for Construction of Industrial Metal Pipelines";

3 The welding work in the preparation and installation of pressure-bearing pipelines shall comply with the provisions of DL/T 869 "Welding Technical Regulations for Thermal Power Plants";

4 The installation of lifting equipment, etc. shall be carried out in accordance with GB 50278 "Code for Construction and Acceptance of Lifting Equipment Installation Engineering" and GB 50231 "Machine Equipment Safety "General Code for Construction and Acceptance of Installation Engineering";

5 Steel structure welding shall comply with the provisions of DL/T 678 "General Technical Conditions for Electric Power Steel Structure Welding";

6 The start-up and acceptance of the flue gas purification device shall comply with this code and DL/T 5437 "Regulations for start-up trial operation and acceptance of thermal power generation construction projects" Provisions;

7 The processing and preparation of the flue gas purification device shall comply with the provisions of DL 5190.8 "Technical Specifications for Power Construction Construction Part 8: Processing and Preparation".

8 For other cited standards, see the list of cited standards.

3.1.4 Denitration catalysts, filter bags, anti-corrosion and wear-resistant materials, alloy steel materials, thermal insulation materials, etc. shall be re-inspected according to relevant national and industry standards.

3.1.5 The equipment involved in the "Special Equipment Safety Supervision Regulations" shall be accompanied by the design documents required by the safety technical specifications and the product quality Qualification certificate, installation and maintenance instructions, supervision and inspection certificate and other documents.

3.1.6 For products and equipment that adopt the "five new" technology, if the manufacturer has no clear requirements, the construction unit, supervision unit, design unit, manufacturing unit the construction unit and the construction unit jointly study and formulate the construction plan and follow the implementation.

3.1.7 Before installation of the flue gas purification device, the equipment should be re-examined according to this specification. If any manufacturing defect is found, it should be submitted to the construction unit, the supervision unit and the manufacturer.

The manufacturing unit researches, processes and visas.

3.1.8 The finished or semi-finished products processed on site (including flue ducts, etc.) shall be inspected in accordance with the requirements of this code and current industry standards.

3.1.9 Before the installation of the flue gas purification device starts, the installation site should meet the following conditions.

1 Complete the equipment foundation, underground trenches and underground facilities, as well as the concrete platforms of each layer in the workshop. The ground should be backfilled and compacted, and concrete should be made Rough ground, complete the access to the factory building, and meet the requirements of the construction organization design;

2 The equipment foundation shall be inspected according to GB 50204 "Code for Acceptance of Concrete Structure Engineering Construction Quality", the acceptance shall be qualified and the handover procedures shall be handled;

Do not bear weight when the strength does not reach 70% of the design value;

3 The positioning axis and elevation of the foundation have been marked and protected on the foundation;

4 The holes and openings on the building should have reliable covers or railings;

5 The installation site should have reliable fire-fighting facilities, lighting and drainage facilities;

6 After the construction plan is approved by the supervisor and the owner, the plan preparer shall organize the safety and technical clarification of the operators, and the personnel of special types of work shall Work with a certificate.

3.1.10 During the equipment installation process, inspection and acceptance should be carried out in time; if the previous process has not passed the inspection and acceptance, the construction of the next process shall not be carried out.

The concealment project must pass inspection and acceptance before concealment, and apply for a visa. In order to ensure the quality of the installation, the concealment of the inspection and the visa is not checked as required no project shall be concealed without authorization.

3.1.11 The following technical documents shall be available after the installation of the flue gas purification device.

1 Equipment defect record and visa;

2 Design change information;

3 Intermediate acceptance records and visas;

4 Installation technical records and visas;

5 Quality acceptance form.

3.1.12 Do not arbitrarily punch holes in the building. When required for construction, it should be confirmed by the design department and appropriate drilling tools should be selected.

3.1.13 After the anchor bolts are installed, corresponding protection should be added.

3.1.14 Reliable isolation facilities should be provided between adjacent construction areas, and safety protection measures should be taken in construction and installation cross-construction areas.

3.2 Green construction

3.2.1 The green construction plan shall be approved.

3.2.2 The power consumption control indicators for production, living, office and construction equipment are set separately at the construction site, and measurement, accounting, and comparative analysis are performed on a regular basis.

And there are preventive and corrective measures.

3.2.3 The layout is required to be reasonable and compact, so as to reduce waste land and dead space while meeting the requirements of environment, occupational health and safety, and civilized construction.

Corner, the effective utilization rate of the temporary facilities is greater than 90%.

3.2.4 The construction site shall determine water quota indicators for domestic water and engineering water, and measure and manage them separately. Non-traditional water sources and the reuse rate of circulating water is greater tha...