CN217092856U - Denitration process device with double systems combined - Google Patents

Abstract

The application discloses aDenitration process units that dual system allies oneself with usefulness relate to the environmental protection equipment field. The system sequentially comprises an efficient heat exchange system, a main pipeline, an SNCR (selective non catalytic reduction) denitration A tower and an SCR denitration B tower along the flue gas flow direction; the SNCR denitration A tower comprises a mixed first area, a mixed second area and a mixed third area along the airflow direction; a primary pipeline, a secondary pipeline and a tertiary pipeline are divided between the main pipeline and the SNCR denitration A tower; three fluid systems are arranged on the secondary pipeline and the tertiary pipeline; the SCR denitration B tower comprises a mixed fourth area, a mixed fifth area and an SCR reaction area along the airflow direction, and the terminal of the SCR denitration B tower is connected with a flue gas inlet and outlet system; this application adopts SNCR and the compound denitration device of SCR to ally oneself with usefulness, has that energy-conservation is showing, denitration efficiency is high, ammonia escape is low, be convenient for detect, flue gas zero escape is more environmental protection, installation maintenance detects the advantage that manufacturability is good, has realized energy saving and emission reduction, NO _X And the purpose of standard emission of ammonia.

Description

Denitration process device with double systems combined

Technical Field

The application relates to the field of environment-friendly equipment, in particular to a denitration process device with double systems combined.

Background

Currently, three environmental issues facing the world include: greenhouse effect, acid precipitation and ozone layer depletion; among the pollutants responsible for the above-mentioned atmospheric environmental problems, NO _X Occupies a very important proportion, and is sufficient for greatly influencing the nature. NO _X The compound is not only the basis of nitric acid type acid rain, but also one of main substances which form photochemical smog and destroy the ozone layer, has strong toxicity, and has great harm to human bodies, environment and ecology and great damage to social economy.

Denitration of flue gas, i.e. the removal of NO produced _X Reduction to N ₂ Thereby removing NO in the flue gas _X The flue gas denitration technology mainly comprises a dry method and a wet method. Wherein the dry denitration process comprises a selective non-catalytic reduction method SNCR and a selective catalytic reduction method SCR; and the wet denitration process is mainly an ozone oxidation absorption method. Compared with the wet method, the dry method has the main advantages that: low investment, simple equipment and technological process, and NO removal _X The efficiency is higher, no wastewater and waste treatment is caused, and secondary pollution is not easy to cause. Among numerous denitration technologies, the selective catalytic reduction SCR has the highest denitration efficiency which can reach 80-90%, and becomes the most mature denitration technology at present.

Currently, strict NO is established in a plurality of provinces and regions in China _X The emission standard requires that the denitration efficiency is required to reach 97-99.5%, the requirement on ammonia escape indexes is more and more strict, and the traditional denitration technology can not meet new standards any more.

Disclosure of Invention

In order to solve the technical problems, the application provides a denitration process device with a dual-system combination, and the technical problems of the application are realized through the following technical scheme: a dual-system combined denitration process device sequentially comprises an efficient heat exchange system, a main pipeline, an SNCR denitration A tower and an SCR denitration B tower along the flue gas flow direction; the SNCR denitration A tower comprises a mixed first area, a mixed second area and a mixed third area along the airflow direction; the main pipeline and the SNCR denitration A tower are divided into a primary pipeline, a secondary pipeline and a tertiary pipeline, and the primary pipeline is connected with an air mixing pipeline and a natural gas pipeline in parallel and then is connected into a mixing first area; the secondary pipeline is connected into the mixing second area; the third-stage pipeline is connected into a third mixing zone; three fluid systems are arranged on the secondary pipeline and the tertiary pipeline; the SCR denitration B tower comprises a mixed fourth area, a mixed fifth area and an SCR reaction area along the airflow direction, and the SCR denitration B tower terminal is connected with a flue gas inlet and outlet system.

Further, high-efficient heat transfer system includes flue gas distribution B pipeline, indirect heating equipment and flue gas distribution A pipeline along the flue gas flow direction in proper order, flue gas distribution A connects the trunk line behind the pipeline.

Further, the secondary pipeline and the tertiary pipeline comprise an initially shared branch pipeline, a three-fluid spray gun is arranged on the branch pipeline, and the three-fluid spray gun is used for spraying the secondary pipeline and the tertiary pipeline simultaneously; the pipeline system is characterized in that a first proportional regulating valve is arranged on the first-stage pipeline, a second proportional regulating valve is arranged on the second-stage pipeline, and a third manual regulating valve is arranged on the third-stage pipeline.

Furthermore, a high-pressure blower, a manual regulating valve and a proportion regulating valve are sequentially arranged on the air mixing pipeline along the air flowing direction.

Furthermore, a gas main valve, a manual gas valve, a gas electromagnetic valve and an air-fuel proportional valve are sequentially arranged on the natural gas pipeline along the gas inlet direction of the natural gas; the tail of the natural gas pipeline is provided with a heating burner, the heating burner is arranged in a mixed first area of the SNCR denitration A tower, and the air mixing pipeline is communicated with the heating burner.

Further, the communicating space between the second mixing area and the secondary pipeline is an annular cavity A; the intercommunication space that mixes third district and tertiary pipeline is annular B cavity, set up the spinning disk in the annular A cavity, mix the external high temperature flue gas pipeline in third district.

Further, an umbrella-shaped outlet and a standby detection port A are arranged in the mixed fourth area, and a homogenization layer A is arranged at the bottom of the mixed fourth area; and a catalyst initial smoke temperature detection port is arranged in the fifth mixing area, and a homogenization layer B is arranged at the bottom of the fifth mixing area. Further, the SCR reaction zone sequentially comprises a first layer of catalyst, a second layer of catalyst, a third layer of catalyst and a standby layer of catalyst along the airflow direction; and the SCR reaction zone is externally wrapped by a heat-insulating B layer and is connected with a flue gas inlet and outlet system through a fixed support.

Further, the three-fluid system comprises a compressed air system, a reducing agent rough adjusting system and a reducing agent fine adjusting system, the compressed air system comprises a compressed air pipeline connected to the three-fluid spray gun, and an air pressure manual ball valve, an air source triple piece and a manual adjusting needle valve are sequentially arranged on the compressed air pipeline along the air inlet direction.

In summary, the present application has the following beneficial effects:

this application adopts SNCR and the compound denitration device of SCR to ally oneself with usefulness, has that energy-conservation is showing, the denitration is efficient, ammonia escape is low, be convenient for detect, flue gas zero escape more environmental protection, installation maintenance detect the advantage that manufacturability is good.

Drawings

FIG. 1 is a schematic view of a denitration process apparatus according to the present application;

FIG. 2 is a schematic view of a three stage flue gas system of the present application;

FIG. 3 is a schematic structural diagram of an SNCR denitration A tower;

FIG. 4 is a schematic structural diagram of an SCR multifunctional denitration B tower;

FIG. 5 is a schematic view of a three-fluid spray gun system.

Description of reference numerals:

1. a high efficiency heat exchange system; 101. a flue gas distribution A pipeline; 102. heat exchange equipment; 103. a flue gas distribution pipeline B;

2. a main pipeline; 201. a branch pipe;

3. a primary pipeline; 301. a proportional regulating valve;

4. a secondary pipeline; 401. a proportional regulating valve;

5. a tertiary pipeline; 501. a manual regulating three valve;

6. an air mixing duct; 601. a high pressure blower; 602. manually adjusting a valve; 603. a proportional regulating valve;

7. a natural gas pipeline; 701. a gas main valve; 702. a manual gas valve; 703. a gas solenoid valve; 704. an air-fuel ratio valve; 705. heating the burner;

8. an SNCR denitration A tower; 801. a mixing first zone; 802. a mixing second zone; 803. a third zone of mixing; 804. an annular cavity A; 805. an annular cavity B; 806. a spinning disk; 807. a secondary flue gas outlet; 808. A third-stage flue gas outlet; 809. insulating the layer A; 810. a high temperature flue gas duct;

9. SCR denitration B tower;

901. a mixing fourth zone; 9011. homogenizing the layer A; 9012. an umbrella-shaped outlet; 9013. detecting an A port for later use;

902. a mixed fifth zone; 9021. homogenizing the B layer; 9022. a catalyst initial smoke temperature detection port;

903. an SCR reaction zone; 9031. a first layer of catalyst; 9032. a second layer of catalyst; 9033. a third layer of catalyst; 9034. a spare layer catalyst; 9035. insulating the layer B; 9036. fixing a bracket;

10. a compressed air system; 1001. a pneumatic manual ball valve; 1002. an air source triplet; 1003. manually adjusting the needle valve; 1004. a compressed air conduit;

11. a reductant coarse tuning system; 1101. a pin remover vat; 1102. an ammonia supplementing pump; 1103. a pin remover keg; 1104. an ammonia spraying A pump; 1105. a denitration agent A pipeline; 1106. coarse adjustment of the ball valve; 1107. a pressure stabilizing valve is roughly adjusted; 1108. manually coarsely adjusting the needle valve;

12. a reductant fine-tuning system; 1201. an ammonia spraying B pump; 1202. a denitration agent B pipeline; 1203. finely adjusting the ball valve; 1204. finely adjusting a pressure stabilizing valve; 1205. manually fine-adjusting the needle valve;

13. a three-fluid spray gun.

14. Flue gas enters and exits the system; 1401. an air inlet pipe; 1402. and (4) exhausting the gas.

Detailed Description

The present application is described in further detail below with reference to the attached drawings. Referring to fig. 1 to 5, a denitration process apparatus in which two systems are combined, wherein fluid flow direction schematic diagrams refer to fig. 1:

the hollow single arrow indicates the flow direction of the flue gas before the catalyst is introduced;

the solid double arrow indicates the flow direction of the reducing agent;

the hollow double-arrow is the flow direction of the catalyzed flue gas;

the hollow three-arrow is the natural gas flow direction;

the solid three arrows indicate the direction of the condensed water.

The denitration process device with the combined double systems sequentially comprises a high-efficiency heat exchange system 1, a main pipeline 2, an SNCR denitration A tower 8 and an SCR denitration B tower 9 along the flue gas flow direction; the SNCR denitration A tower 8 comprises a mixing first zone 801, a mixing second zone 802 and a mixing third zone 803 in the airflow direction; a primary pipeline 3, a secondary pipeline 4 and a tertiary pipeline 5 are divided between the main pipeline 2 and the SNCR denitration A tower 8, and the primary pipeline 3, an air mixing pipeline 6 and a natural gas pipeline 7 are connected in parallel and then are connected into a mixing first area 801; the secondary pipe 4 is connected into a mixing second area 802; the tertiary pipe 5 is connected to a third mixing zone 803; a three-fluid system is arranged on the secondary pipeline 4 and the tertiary pipeline 5; the SCR denitration B tower 9 comprises a mixed fourth area 901, a mixed fifth area 902 and an SCR reaction area 903 along the airflow direction, and the terminal of the SCR denitration B tower 9 is connected with a flue gas inlet and outlet system 14.

The flue gas inlet and outlet system 14 comprises an inlet pipe 1401 and an outlet pipe 1402, and both pipelines are located on the same side of the SCR denitration B tower 9.

The high-efficiency heat exchange system 1 sequentially comprises a flue gas distribution B pipeline 103, a heat exchange device 102 and a flue gas distribution A pipeline 101 along the flow direction of flue gas, and the rear part of the flue gas distribution A pipeline 101 is connected with a main pipeline 2.

Referring to fig. 2, the secondary pipe 4 and the tertiary pipe 5 include an initially common branch pipe 201, and a three-fluid spray gun 13 is disposed on the branch pipe 201, and the three-fluid spray gun 13 is used for spraying the secondary pipe 4 and the tertiary pipe 5 simultaneously; the first-level pipeline 3 is provided with a first proportional regulating valve 301, the second-level pipeline 4 is provided with a second proportional regulating valve 401, and the third-level pipeline 5 is provided with a third manual regulating valve 501.

The air mixing pipe 6 is provided with a high pressure blower 601, a manual regulating valve 602 and a proportional regulating valve 603 in sequence along the air flowing direction.

A gas main valve 701, a manual gas valve 702, a gas electromagnetic valve 703 and an air-fuel ratio valve 704 are sequentially arranged on the natural gas pipeline 7 along the natural gas inlet direction; and a heating burner 705 is arranged at the tail part of the natural gas pipeline 7, the heating burner 705 is arranged in a mixing first area 801 of the SNCR denitration A tower 8, and the air mixing pipeline 6 is communicated with the heating burner 705.

Referring to fig. 3, a heat preservation layer a 809 is arranged outside the SNCR denitration a tower 8, the first mixing zone 801 is a combustion space of primary flue gas, air and natural gas, and a communication space between the second mixing zone 802 and the secondary pipeline 4 is an annular cavity a 804; the gas in the mixed first area 801 enters the mixed second area 802 from the secondary flue gas outlet 807, and the gas in the mixed second area 802 comprises high-temperature flue gas, secondary flue gas and gaseous denitration reducing agent generated by combustion in the mixed first area 801.

The communicating space between the third mixing zone 803 and the third-stage pipeline 5 is an annular cavity B805, the annular cavity B805 is communicated with the third mixing zone 803 through a third-stage flue gas outlet 808, a cyclone plate 806 is arranged in the annular cavity A804, and the third mixing zone 803 is externally connected with a high-temperature flue gas pipeline 810.

Referring to fig. 4, an umbrella-shaped outlet 9012 and a standby detection port a 9013 are arranged in the mixed fourth region 901, and a homogenization layer a 9011 is arranged at the bottom of the mixed fourth region 901; a catalyst initial smoke temperature detection port 9022 is arranged in the fifth mixing area 902, and a homogenization layer B9021 is arranged at the bottom of the fifth mixing area.

The SCR reaction zone 903 sequentially comprises a first layer of catalyst 9031, a second layer of catalyst 9032, a third layer of catalyst 9033 and a standby layer of catalyst 9034 along the airflow direction; the SCR reaction region 903 is externally wrapped by a heat preservation B layer 9035, and the SCR reaction region 903 is connected to the flue gas inlet and outlet system 14 through a fixing support 9036.

Referring to fig. 5, the three-fluid system includes a compressed air system 10, a reducing agent rough adjustment system 11 and a reducing agent fine adjustment system 12, the compressed air system 10 includes a compressed air pipe 1004 connected to a three-fluid spray gun 13, and a pneumatic manual ball valve 1001, an air supply triple piece 1002 and a manual adjustment needle valve 1003 are sequentially arranged on the compressed air pipe 1004 along an air inlet direction.

The reducing agent coarse adjustment system 11 comprises a reducing agent main pipeline and a marketing agent A pipeline 1105, the reducing agent main pipeline is sequentially provided with a marketing agent vat 1101, an ammonia supplementing pump 1102 and a marketing agent keg 1103, the marketing agent keg 1103 is connected with an ammonia spraying A pump 1104 and the marketing agent A pipeline 1105 at the back, and a coarse adjustment ball valve 1106, a coarse adjustment pressure stabilizing valve 1107 and a manual coarse adjustment needle valve 1108 are arranged on the marketing agent A pipeline 1105 along the fluid direction; the end of the strip A line 1105 opens into the three-fluid lance 13.

The reducing agent fine adjustment system 12 comprises an ammonia spraying B pump 1201 and a denitration agent B pipeline 1202, the ammonia spraying B pump 1201 is connected with a denitration agent keg 1103, and a fine adjustment ball valve 1203, a fine adjustment pressure stabilizing valve 1204 and a manual fine adjustment needle valve 1205 are arranged on the denitration agent B pipeline 1202 along the fluid direction; the terminal end of the denitration agent B pipe 1202 opens into the three-fluid lance 13.

And the bottom of the annular cavity A804, the bottom of the mixed fourth area 901 and the bottom of the efficient heat exchange system 1 are provided with condensed water U-shaped pipes for discharging condensed water vapor generated in the system.

This application sets up a plurality of observing and controling systems in SNCR denitration A tower 8, SCR denitration B tower 9, if: the system comprises a flue gas temperature measurement and control system, a flue gas component measurement system, a flue gas flow control system and a denitration reducing agent control system.

The flue gas temperature measurement and control system comprises an SNCR reaction zone flue gas temperature measurement and control system, a catalyst initial flue gas temperature measurement and control system, a catalyst tail end flue gas temperature measurement and control system, a flue gas standard emission temperature measurement system, an initial flue gas temperature measurement system and a plurality of standby port temperature measurement systems;

the smoke component measuring system consists of initial smoke component measurement and smoke emission component measurement reaching the standard;

the smoke flow control system is composed of initial smoke flow measurement and smoke discharge flow measurement reaching the standard;

the denitration reducing agent control system is composed of denitration reducing agent rough adjustment control, denitration reducing agent fine adjustment control and denitration reducing agent metering control.

The measurement and control system is selectively installed and used according to the actual situation.

The utility model discloses a theory of operation does: after the pretreated flue gas enters the high-efficiency heat exchange system 1 through the gas inlet pipe 1401, the temperature of the flue gas is further raised, the flue gas is divided into three stages, wherein the atomized denitration liquid sprayed by the three-fluid spray gun 13 is mixed with the flue gas to form two-stage and three-stage flue gas. The primary flue gas is heated by the heating burner 705 to realize low-nitrogen combustion, so that more NO is prevented from being generated in the heating process of the flue gas _X The SNCR denitration treatment of the first-stage flue gas and the second-stage flue gas is completed in the mixed second area 802, the initial concentration of NOx in the flue gas is reduced by 10% -20%, and the difficulty of the next denitration treatment is reduced.

The first, second and third-stage flue gases are converged and mixed for a plurality of times, enter the SCR denitration B tower 9 after being homogenized, are subjected to catalytic denitration and then are discharged after reaching the standard through the exhaust pipe 1402. Wherein the smoke parameters (flow, smoke temperature and NO) measured by the detection device on the air inlet pipe 1401 _X Concentration of the denitration reducing agent) to calculate and control the usage of the denitration reducing agent coarse adjustment system 11 to 90-95% of the rational usage, and strictly controlling the usage not to be excessive, and simultaneously measuring the flue gas temperature and the flue gas parameters (flow and NO) by a detection device on the exhaust pipe 1402 _X Concentration of (3), NH ₃ Concentration) to calculate and control the amount of nox reduction agent fine tuning system 12 within a normal range.

The above is a preferred embodiment of the present application, and the present application is not limited to the above-mentioned structure, and may have various modifications, and may be applied to more similar fields, and in short, all modifications and changes that do not depart from the design idea, mechanical structure form, and intelligent driving control manner of the present application fall within the scope of the present application.

Claims (9)

1. A denitration process units that dual system allies oneself with uses which characterized in that: the system sequentially comprises an efficient heat exchange system (1), a main pipeline (2), an SNCR denitration A tower (8) and an SCR denitration B tower (9) along the flue gas flow direction; the SNCR denitration A tower (8) comprises a mixing first zone (801), a mixing second zone (802) and a mixing third zone (803) along the airflow direction; the main pipeline (2) and the SNCR denitration A tower (8) are divided into a primary pipeline (3), a secondary pipeline (4) and a tertiary pipeline (5), and the primary pipeline (3), an air mixing pipeline (6) and a natural gas pipeline (7) are connected in parallel and then are connected into a mixing first area (801); the secondary pipeline (4) is connected into a mixing second area (802); the third-stage pipeline (5) is connected into a third mixing zone (803); a three-fluid system is arranged on the secondary pipeline (4) and the tertiary pipeline (5); the SCR denitration B tower (9) comprises a mixed fourth area (901), a mixed fifth area (902) and an SCR reaction area (903) along the airflow direction, and the terminal of the SCR denitration B tower (9) is connected with a flue gas inlet and outlet system (14).

2. The denitration process device combined with two systems according to claim 1, wherein: the high-efficiency heat exchange system (1) sequentially comprises a flue gas distribution B pipeline (103), heat exchange equipment (102) and a flue gas distribution A pipeline (101) along the flow direction of flue gas, and the flue gas distribution A pipeline (101) is connected with a main pipeline (2) in the rear.

3. The denitration process device combined with two systems according to claim 1, wherein: the secondary pipeline (4) and the tertiary pipeline (5) comprise an initial shared branch pipeline (201), a three-fluid spray gun (13) is arranged on the branch pipeline (201), and the three-fluid spray gun (13) is used for spraying the secondary pipeline (4) and the tertiary pipeline (5) simultaneously; the device is characterized in that a first proportional regulating valve (301) is arranged on the first-level pipeline (3), a second proportional regulating valve (401) is arranged on the second-level pipeline (4), and a third manual regulating valve (501) is arranged on the third-level pipeline (5).

4. The denitration process device of claim 1, wherein: the air mixing pipeline (6) is sequentially provided with a high-pressure blower (601), a manual regulating valve (602) and a proportional regulating valve (603) along the air flowing direction.

5. The denitration process device combined with two systems according to claim 4, wherein: a gas main valve (701), a manual gas valve (702), a gas electromagnetic valve (703) and an air-fuel proportional valve (704) are sequentially arranged on the natural gas pipeline (7) along the natural gas inlet direction; the tail of the natural gas pipeline (7) is provided with a heating burner (705), the heating burner (705) is arranged in a mixing first area (801) of the SNCR denitration A tower (8), and the air mixing pipeline (6) is communicated with the heating burner (705).

6. The denitration process device combined with two systems according to claim 1, wherein: the communicating space between the mixing second area (802) and the secondary pipeline (4) is an annular cavity A (804); the intercommunication space that mixes third district (803) and tertiary pipeline (5) is annular B cavity (805), set up spinning disk (806) in annular A cavity (804), mix external high temperature flue gas pipeline (810) in third district (803).

7. The denitration process device combined with two systems according to claim 1, wherein: an umbrella-shaped outlet (9012) and a standby detection A port (9013) are arranged in the mixed fourth area (901), and a homogenization A layer (9011) is arranged at the bottom of the mixed fourth area (901); a catalyst initial smoke temperature detection port (9022) is arranged in the fifth mixing area (902), and a homogenization layer B (9021) is arranged at the bottom of the fifth mixing area.

8. The denitration process device combined with two systems according to claim 7, wherein: the SCR reaction zone (903) sequentially comprises a first layer of catalyst (9031), a second layer of catalyst (9032), a third layer of catalyst (9033) and a spare layer of catalyst (9034) along the airflow direction; and a heat preservation B layer (9035) is wrapped outside the SCR reaction region (903), and the SCR reaction region (903) is connected to the flue gas inlet and outlet system (14) through a fixing support (9036).

9. The denitration process device combined with two systems according to claim 3, wherein: the three-fluid system comprises a compressed air system (10), a reducing agent rough adjusting system (11) and a reducing agent fine adjusting system (12), wherein the compressed air system (10) comprises a compressed air pipeline (1004) connected to a three-fluid spray gun (13), and an air pressure manual ball valve (1001), an air source triple piece (1002) and a manual adjusting needle valve (1003) are sequentially arranged on the compressed air pipeline (1004) along the air inlet direction.

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