CN115301078A - Denitration system for pyrolyzing urea by utilizing energy of exhaust-heat boiler blowdown system - Google Patents
Denitration system for pyrolyzing urea by utilizing energy of exhaust-heat boiler blowdown system Download PDFInfo
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- CN115301078A CN115301078A CN202210762494.1A CN202210762494A CN115301078A CN 115301078 A CN115301078 A CN 115301078A CN 202210762494 A CN202210762494 A CN 202210762494A CN 115301078 A CN115301078 A CN 115301078A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/343—Heat recovery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8696—Controlling the catalytic process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/88—Handling or mounting catalysts
- B01D53/885—Devices in general for catalytic purification of waste gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention discloses a denitration system for pyrolyzing urea by utilizing energy of a waste heat boiler blow-down system, which improves the waste heat boiler blow-down system and the denitration system and solves the problem that the existing waste heat boiler denitration system is required to be provided with a high-temperature booster fan. The waste heat boiler waste heat treatment system comprises a waste heat boiler waste heat removal system and a denitration system, wherein the waste heat boiler waste heat removal system comprises a high-pressure steam drum, a medium-pressure steam drum, a low-pressure steam drum, a continuous-row flash tank and a fixed-row flash tank; saturated steam generated by the exhaust system of the waste heat boiler is used for extracting high-temperature flue gas through the Venturi mixer, and the high-temperature flue gas is sent into the urea pyrolysis tank for urea pyrolysis. The invention fully utilizes the energy of the exhaust system of the waste heat boiler, reduces the discharged sewage amount, reduces the waste of working media and heat, can save investment for the denitration system of the waste heat boiler, and has simple operation and maintenance.
Description
Technical Field
The invention relates to a denitration system for pyrolyzing urea by utilizing energy of a waste heat boiler exhaust system, and belongs to the technical field of denitration systems.
Background
The application of the gas-steam combined cycle unit in China is more and more extensive, and because the national environmental protection requirement is higher and higher, waste heat boilers in the combined cycle unit are all provided with denitration systems. The denitration system generally pyrolyzes urea solution into ammonia gas as a denitration reducing agent, the heat source adopts a high-temperature booster fan to extract high-temperature flue gas from an inlet of the waste heat boiler, the high-temperature flue gas enters a pyrolysis tank to be mixed with the urea solution, and the urea is pyrolyzed into the ammonia gas and then is sent into an inlet of a denitration catalyst layer of the waste heat boiler to be subjected to denitration, which is a configuration mode of the conventional waste heat boiler denitration system. The method has the disadvantages that a high-temperature booster fan is required to be independently configured to extract high-temperature flue gas, and the temperature of the high-temperature flue gas at the inlet of the waste heat boiler is as high as over 600 ℃, so that the cooling and sealing requirements and the high-temperature performance of materials of the high-temperature booster fan are high, and the equipment investment is increased.
At present, the energy recovery of the waste heat boiler blow-down system generally introduces continuous blow-down water into a continuous blow-down flash tank, saturated steam generated by the flash tank is introduced into a low-pressure steam drum to recover working media and heat, the blow-down water enters a constant-pressure flash tank, the upper part of the constant-pressure flash tank is connected with the atmosphere, and the lower part of the constant-pressure flash tank is connected with a blow-down pool.
How to make full use of waste heat boiler blowdown system's energy as the power supply, replace high temperature booster fan to extract high temperature flue gas, prior art still remains to be improved and developed.
Disclosure of Invention
The invention aims to overcome the defect that a high-temperature booster fan needs to be arranged in a denitration system in the prior art, and provides a denitration system for pyrolyzing urea by utilizing the energy of a waste heat boiler blow-down system. The waste heat boiler denitration system can utilize the energy of the sewage discharge system to pyrolyze the urea and send the urea into the denitration layer of the boiler to perform denitration, and the waste heat boiler denitration system has the advantages of investment saving, simplicity and convenience in operation and capability of fully utilizing the sewage discharge energy of the waste heat boiler.
The technical scheme adopted by the invention for solving the problems is as follows: a denitration system for pyrolyzing urea by utilizing energy of a waste heat boiler blowdown system is characterized by comprising the waste heat boiler blowdown system and a denitration system, wherein the waste heat boiler blowdown system comprises a high-pressure steam drum, a medium-pressure steam drum, a low-pressure steam drum, a continuous-row flash tank and a fixed-row flash tank, and the denitration system comprises a Venturi mixer, a urea pyrolysis tank and a waste heat boiler flue; the high-pressure steam drum is connected with the continuous-discharge flash tank through a first steam-water pipeline, a first electric stop valve and a first electric regulating valve are installed on the first steam-water pipeline, the medium-pressure steam drum is connected with the continuous-discharge flash tank through a second steam-water pipeline, a second electric stop valve and a second electric regulating valve are installed on the second steam-water pipeline, the low-pressure steam drum is connected with the continuous-discharge flash tank through a third steam-water pipeline, a third electric regulating valve is installed on the third steam-water pipeline, the venturi mixer is connected with the continuous-discharge flash tank through a fourth steam-water pipeline, a fourth electric regulating valve is installed on the fourth steam-water pipeline, the urea pyrolysis tank is connected with the venturi mixer through a fifth steam-water pipeline, the continuous-discharge flash tank is connected with the fixed-discharge flash tank through a sixth steam-water pipeline, a fifth electric regulating valve is installed on the sixth steam-water pipeline, the venturi mixer is connected with an inlet of a flue of the waste heat boiler through a seventh flue gas pipeline, a check valve and an electric butterfly valve are installed on the seventh flue gas pipeline, a waste heat boiler flue is provided with a urea supply solution layer, and an urea supply solution is connected with the third electric regulating valve and an electric butterfly valve.
Furthermore, the first electric stop valve controls whether the first steam-water pipeline circulates or not, and the first electric regulating valve controls the sewage discharge amount of the high-pressure steam pocket introduced into the continuous drainage flash tank.
Furthermore, the second electric stop valve controls whether a second steam-water pipeline circulates or not, and the second electric regulating valve controls the sewage discharge amount of the medium-pressure steam pocket introduced into the continuous-discharge flash tank.
Furthermore, the electric control valve controls the steam quantity entering the low-pressure steam pocket of the continuous-discharge flash tank in a three-control mode.
Furthermore, the electric control valve controls the steam quantity entering the Venturi mixer from the continuous discharge flash tank.
Furthermore, the electric regulating valve five controls the sewage discharge amount of the continuous discharge flash tank introduced into the fixed discharge flash tank, and can regulate the steam-water pressure in the continuous discharge flash tank.
Furthermore, the electric butterfly valve controls the circulation of the No. seven flue gas pipeline, and the check valve can prevent steam from flowing back to the inlet of the waste heat boiler flue.
Furthermore, the third electric stop valve can control the circulation of the urea solution supply pipeline, and the sixth electric regulating valve can regulate the flow of the urea solution.
Compared with the prior art, the invention has the following advantages and effects: according to the invention, the Venturi mixer is used for replacing a high-temperature booster fan to extract high-temperature flue gas from the inlet of the flue of the waste heat boiler, the extracted high-temperature flue gas enters the urea solution pyrolysis tank to pyrolyze the urea solution into ammonia gas, and enters the denitration layer of the waste heat boiler to carry out flue gas denitration, so that the initial investment of the high-temperature booster fan can be saved, and the operation and maintenance workload in the operation process can be reduced. The invention uses the steam energy of the waste heat boiler blow-down system as a power source, and does not need to provide extra power, thereby saving auxiliary power.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
In the figure: a waste heat boiler blow-down system 101 and a denitration system 102; the system comprises a high-pressure steam drum 1, a medium-pressure steam drum 2, a low-pressure steam drum 3, a continuous-row flash tank 4, a Venturi mixer 5, a urea pyrolysis tank 6, a waste heat boiler flue 7, a fixed-row flash tank 8 and a denitration layer 9; the device comprises an electric stop valve I11, an electric regulating valve I12, an electric stop valve II 13, an electric regulating valve II 14, an electric regulating valve III 15, an electric regulating valve IV 16, an electric regulating valve V17, a check valve 18, an electric butterfly valve 19, an electric regulating valve VI 20 and an electric stop valve III 21; a first steam-water pipeline 31, a second steam-water pipeline 32, a third steam-water pipeline 33, a fourth steam-water pipeline 34, a fifth steam-water pipeline 35, a sixth steam-water pipeline 36, a seventh flue gas pipeline 37, an eighth flue gas pipeline 38 and a urea solution supply pipeline 39.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1, in the embodiment, a denitration system for pyrolyzing urea by using energy of a waste heat boiler exhaust system includes a waste heat boiler exhaust system 101 and a denitration system 102, the waste heat boiler exhaust system 101 includes a high-pressure steam drum 1, a medium-pressure steam drum 2, a low-pressure steam drum 3, a continuous-exhaust flash tank 4 and a fixed-exhaust flash tank 8, and the denitration system 102 includes a venturi mixer 5, a urea pyrolysis tank 6 and a waste heat boiler flue 7; the high-pressure steam pocket 1 is connected with the continuous-discharge flash tank 4 through a first steam-water pipeline 31, a first electric stop valve 11 and a first electric regulating valve 12 are installed on the first steam-water pipeline 31, the medium-pressure steam pocket 2 is connected with the continuous-discharge flash tank 4 through a second steam-water pipeline 32, a second electric stop valve 13 and a second electric regulating valve 14 are installed on the second steam-water pipeline 32, the low-pressure steam pocket 3 is connected with the continuous-discharge flash tank 4 through a third steam-water pipeline 33, a third electric regulating valve 15 is installed on the third steam-water pipeline 33, the venturi mixer 5 is connected with the continuous-discharge flash tank 4 through a fourth steam-water pipeline 34, a fourth electric regulating valve 16 is installed on the fourth steam-water pipeline 34, the urea pyrolysis tank 6 is connected with the venturi mixer 5 through a fifth steam-water pipeline 35, the continuous-discharge flash tank 4 is connected with the fixed-discharge flash tank 8 through a sixth steam-water pipeline 36, a fifth electric regulating valve 17 is installed on the sixth steam-water pipeline 36, the venturi mixer 5 is connected with the inlet of the exhaust-heat boiler 7 through a seventh steam pipeline 37, a seventh electric stop valve 18 and an electric butterfly valve 19 are installed on the seventh steam-flue pipe 9, a denitration boiler 6, a urea-denitration steam-supply pipeline 39 and an urea solution supply layer 20 are installed on the urea-denitration layer 9, and an urea-supply layer 21 are installed on the urea-denitration layer.
Specifically, the first electric stop valve 11 controls whether the first steam-water pipeline 31 is communicated or not, and the first electric regulating valve 12 controls the sewage discharge amount of the high-pressure steam pocket 1 introduced into the continuous drainage flash tank 4. The second electric stop valve 13 controls whether the second steam-water pipeline 32 circulates or not, and the second electric regulating valve 14 controls the sewage discharge amount of the medium-pressure steam drum 2 introduced into the continuous-discharge flash tank 4. And the third electric regulating valve 15 controls the steam quantity entering the low-pressure steam pocket 3 from the continuous discharge flash tank 4. The electric regulating valve four 16 controls the steam quantity entering the venturi mixer 5 from the continuous discharge flash tank 4, thereby controlling the suction smoke quantity of the venturi mixer 5. The fifth electric regulating valve 17 controls the sewage discharge amount of the continuous discharge flash tank 4 introduced into the fixed discharge flash tank 8, and can regulate the steam-water pressure in the continuous discharge flash tank 4. An electric butterfly valve 19 controls the circulation of the No. seven smoke pipeline 37, and a check valve 18 prevents steam from flowing back to the inlet of the waste heat boiler flue 7. The third electric stop valve 21 controls the flow of the urea solution supply pipe 39, and the sixth electric control valve 20 controls the flow rate of the urea solution.
The working principle is as follows: high pressure steam pocket 1 and medium pressure steam pocket 2's blowdown water gets into and even arranges flash tank 4 and carries out the dilatation decompression, even arrange the saturated steam part that flash tank 4 produced and get into low pressure steam pocket 3, the part gets into venturi mixer 5, saturated steam gets into venturi mixer 5 and produces local low pressure and extract high temperature flue gas from the entry of exhaust-heat boiler flue 7, the high temperature flue gas after the mixture enters into urea pyrolysis tank 6 and carries out the pyrolysis to urea solution, the mist that contains the ammonia after the pyrolysis gets into denitration layer 9 and carries out the denitration.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (2)
1. A denitration system for pyrolyzing urea by utilizing energy of a waste heat boiler blowdown system is characterized by comprising the waste heat boiler blowdown system (101) and a denitration system (102), wherein the waste heat boiler blowdown system (101) comprises a high-pressure steam drum (1), a medium-pressure steam drum (2), a low-pressure steam drum (3), a continuous-discharge flash tank (4) and a fixed-discharge flash tank (8), and the denitration system (102) comprises a Venturi mixer (5), a urea pyrolysis tank (6) and a waste heat boiler flue (7); high pressure steam pocket (1) is connected through soda pipeline (31) and continuous discharge flash tank (4), install electric stop valve (11) and electric control valve (12) on soda pipeline (31), medium pressure steam pocket (2) are connected with continuous discharge flash tank (4) through No. two soda pipeline (32), install electric stop valve two (13) and electric control valve two (14) on No. two soda pipeline (32), low pressure steam pocket (3) are connected with continuous discharge flash tank (4) through No. three soda pipeline (33), install electric control valve three (15) on No. three soda pipeline (33), venturi mixer (5) are connected with continuous discharge flash tank (4) through No. four soda pipeline (34), install electric control valve four (16) on No. four soda pipeline (34), urea tank (6) are connected with venturi mixer (5) through No. five pipeline (35), continuous discharge flash tank (4) are connected with continuous discharge flash tank (7) through No. six soda pipeline (36) and continuous discharge flash tank (17), no. 8) are connected with No. six flash tank (17) through No. six steam pipeline (36), no. 17) and No. 7 are connected with continuous discharge flash tank (17) through No. five steam pipe (17), no. 16) are connected with flue gas inlet (17) through No. 7) and flue gas inlet (17), no. 7) and No. 7 are connected with No. 16 The waste heat boiler comprises a valve (19), wherein a denitration layer (9) is arranged in a waste heat boiler flue (7), an outlet of a urea pyrolysis tank (6) is connected with the denitration layer (9) through an eighth flue gas pipeline (38), the urea pyrolysis tank (6) is connected with a urea solution supply pipeline (39), and an electric stop valve III (21) and an electric regulating valve VI (20) are installed on the urea solution supply pipeline (39);
high-pressure steam pocket (1) and the blowdown water of medium pressure steam pocket (2) get into and even arrange flash tank (4) and carry out the dilatation decompression, even arrange the saturated steam part that flash tank (4) produced and get into low pressure steam pocket (3), the part gets into venturi mixer (5), saturated steam gets into venturi mixer (5) and produces local low pressure and extract the high temperature flue gas from the entry of exhaust-heat boiler flue (7), the high temperature flue gas after the mixture gets into urea pyrolysis tank (6) and carries out the pyrolysis to urea solution, the mist that contains the ammonia after the pyrolysis gets into denitration layer (9) and carries out the denitration.
2. The denitration system for pyrolyzing urea by using the energy of the exhaust system of the waste heat boiler as claimed in claim 1, wherein the first electric stop valve (11) controls whether the first steam-water pipeline (31) is communicated or not, and the first electric regulating valve (12) controls the amount of sewage discharged from the high-pressure steam drum (1) into the continuous drainage flash tank (4); the second electric stop valve (13) controls whether the second steam-water pipeline (32) circulates or not, and the second electric regulating valve (14) controls the sewage discharge amount of the medium-pressure steam pocket (2) introduced into the continuous drainage flash tank (4); the electric regulating valve III (15) controls the steam quantity entering the low-pressure steam pocket (3) from the continuous discharge flash tank (4); the fourth electric regulating valve (16) controls the steam quantity entering the Venturi mixer (5) from the continuous discharge flash tank (4); the electric regulating valve V (17) controls the sewage discharge amount of the continuous discharge flash tank (4) introduced into the fixed discharge flash tank (8), and can regulate the steam-water pressure in the continuous discharge flash tank (4); the electric butterfly valve (19) controls whether the No. seven smoke pipeline (37) circulates or not, and the check valve (18) prevents steam from flowing back to an inlet of a flue (7) of the waste heat boiler; the third electric stop valve (21) controls the circulation of the urea solution supply pipeline (39), and the sixth electric regulating valve (20) regulates the flow of the urea solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210762494.1A CN115301078B (en) | 2022-06-30 | 2022-06-30 | Utilize exhaust-heat boiler drain energy pyrolysis urea's deNOx systems |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210762494.1A CN115301078B (en) | 2022-06-30 | 2022-06-30 | Utilize exhaust-heat boiler drain energy pyrolysis urea's deNOx systems |
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| CN115301078A true CN115301078A (en) | 2022-11-08 |
| CN115301078B CN115301078B (en) | 2023-06-23 |
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