CN215086173U - External heating urea pyrolysis denitration device - Google Patents
External heating urea pyrolysis denitration device Download PDFInfo
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- CN215086173U CN215086173U CN202023141076.6U CN202023141076U CN215086173U CN 215086173 U CN215086173 U CN 215086173U CN 202023141076 U CN202023141076 U CN 202023141076U CN 215086173 U CN215086173 U CN 215086173U
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- gas
- urea pyrolysis
- heat exchanger
- urea
- pipeline
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000004202 carbamide Substances 0.000 title claims abstract description 46
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 41
- 238000010438 heat treatment Methods 0.000 title claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 32
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003546 flue gas Substances 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 239000007921 spray Substances 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 9
- 239000000243 solution Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000001321 HNCO Methods 0.000 description 2
- OWIKHYCFFJSOEH-UHFFFAOYSA-N Isocyanic acid Chemical compound N=C=O OWIKHYCFFJSOEH-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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Abstract
The utility model provides an external heating urea pyrolysis denitrification facility, by gas heat exchanger, electric heater, the urea pyrolysis oven links to each other through the pipeline and forms, gas heat exchanger comprises gas collecting drum and finned tube bank, gas collecting drum arranges the drum including cylindrical level from top to bottom, finned tube bank shell is equipped with the thermal-arrest fin, vertical arrangement finned tube bank and horizontal boiler flue gas heat transfer, gas heat exchanger upper end meets with cold wind, the lower extreme meets with the urea pyrolysis oven through the pipeline, electric heater arranges on the hot-blast by-pass pipeline of export, the urea pyrolysis oven adopts vertical cylindrical barrel, hot-blast urea pyrolysis oven that gets into by the bobbin top after the heat transfer, 50% urea solution is arranged by the annular diagonal angle and is spouted into the urea pyrolysis oven on the lateral wall, get into follow-up denitration reaction. The heat exchanger has the advantages of simple structure, high heat exchange efficiency and the like.
Description
Technical Field
The utility model belongs to the technical field of the SCR denitration is administered in environmental protection atmosphere pollution, a external heating urea pyrolysis denitrification facility is related to.
Background
The SCR denitration technology and the selective catalytic reduction denitration technology are mainstream denitration technologies, liquid ammonia, ammonia water or urea are used as reducing agents, denitration catalytic reduction reaction is carried out under the action of a catalyst, and nitrogen oxides NOx in smoke are removed.
The urea is used as a reducing agent to prepare ammonia, and the pyrolysis reaction principle of the urea is as follows:
CO(NH2)2→NH3+HNCO
HNCO+H2O→NH3+CO2
the common urea pyrolysis process comprises the steps of pumping 50% urea solution to a furnace area metering and distributing module through a solution delivery pump, and spraying the urea solution into a pyrolysis furnace through a spray gun after metering and distributing; the method comprises the steps of taking hot primary air of a boiler at a temperature of 200-300 ℃ as a heat source, heating the hot primary air to 350-600 ℃ by a high-power electric heater, spraying the hot primary air into a pyrolysis furnace for urea pyrolysis to generate ammonia gas with the concentration of less than 5%, and spraying the ammonia gas into an SCR reactor by an injection system for denitration reaction.
The urea pyrolysis mainly adopts two modes of heat exchange of high-temperature flue gas (or hot air) and cold air. The denitration system can adopt a built-in heat exchanger for denitration of the boiler, has high heat exchange efficiency, and has large construction workload because the boiler steering chamber and the flue need to be disassembled and modified.
Disclosure of Invention
The problem to built-in heat exchanger, the utility model provides a process systems is simple, the investment is low, the external heating urea pyrolysis denitrification facility that the power consumption working costs is low of saving.
The utility model discloses a realize through following technical scheme: the utility model provides an external heating urea pyrolysis denitrification facility is formed by gas heat exchanger, electric heater, urea pyrolysis oven linking to each other through the pipeline, its characterized in that: the gas-gas heat exchanger consists of a gas-collecting boiler barrel and a fin tube bundle, the gas-collecting boiler barrel comprises an upper cylindrical and a lower cylindrical horizontally-arranged boiler barrel, cold air and hot air are collected and gathered by the upper and the lower gas-collecting boiler barrels, high-temperature flue gas transversely enters and exits, the shell of the finned tube bundle is provided with heat collecting fins, the finned tube bundle is vertically arranged to exchange heat with the flue gas of a transverse boiler, the gas-gas heat exchanger is arranged outside a heat source chamber close to the boiler, the upper end of the gas-gas heat exchanger is connected with cold primary air, the lower end of the gas-gas heat exchanger is connected with the urea pyrolysis furnace through a pipeline, the electric heater is arranged on an outlet hot air bypass pipeline, the urea pyrolysis furnace adopts a vertical cylindrical barrel, hot air enters the urea pyrolysis furnace from the top of the barrel after heat exchange, 50% urea solution is sprayed into the urea pyrolysis furnace through spray guns arranged on the side wall of the barrel in opposite angles, and ammonia-air mixed gas generated by hot air pyrolysis is discharged from the bottom of the urea pyrolysis furnace and enters subsequent denitration reaction.
The utility model has the advantages that: the primary cold air is heated by fully utilizing the high-temperature flue gas or hot air heat source, and the energy consumption of the electric heater is saved. The outdoor air heat exchanger has simple structure and high heat exchange efficiency. The gas-gas heat exchanger and the outlet hot air bypass pipeline are additionally provided with electric heaters for standby, and the structure is reasonable.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the present invention.
In the figure: 1. the method comprises the following steps of (1) cold primary air, 2 an air collecting drum, 3 an air-gas heat exchanger, 4 a finned tube bundle, 5 a high-temperature flue gas inlet, 6 a high-temperature flue gas outlet, 7 an electric heater, 8 outlet hot air, 9 and 50% urea solution, 10 a urea pyrolysis furnace and 11 ammonia-air mixed gas.
Detailed Description
The detailed description is described in conjunction with the appended drawings:
the utility model relates to an external heating urea pyrolysis denitrification facility includes in the drawing: the device comprises a cold primary air 1, a gas collection drum 2, a gas-gas heat exchanger 3, a finned tube bundle 4, a high-temperature flue gas inlet 5, a high-temperature flue gas outlet 6, an electric heater 7, outlet hot air 8, a 50% urea solution 9, a urea pyrolysis furnace 10 and ammonia-air mixed gas 11. The object of denitration is achieved as follows.
The gas-gas heat exchanger 3 is arranged outside the high-temperature flue gas or hot air heat source, cold primary air 1 is collected by a gas collection drum 2 at the upper part of the gas-gas heat exchanger 3 and respectively enters a plurality of staggered arc-shaped vertically arranged fin tube bundles 4, the shell of each fin tube bundle 4 is used for transverse high-temperature flue gas-gas heat exchange, heated hot air is collected by the gas collection drum 2 at the bottom part and enters the urea pyrolysis furnace through a pipeline; an electric heater 7 is arranged on an outlet hot air 8 pipeline in a bypass mode, hot air temperature is higher than 500 ℃ and directly enters the urea pyrolysis furnace 9 for pyrolysis, the electric heater 4 is started for auxiliary heating when the temperature is lower than 500 ℃, 50% urea solution 8 is sprayed into the urea pyrolysis furnace 9 through a spray gun annularly arranged on the cylindrical side wall of the urea pyrolysis furnace 9, and is pyrolyzed by hot air to generate ammonia air-mixed synthetic product gas which is discharged from the bottom of the urea pyrolysis furnace 9 and enters subsequent denitration reaction, so that the aim of denitration is fulfilled.
Claims (1)
1. The utility model provides an external heating urea pyrolysis denitrification facility is formed by gas heat exchanger (3), electric heater (7), urea pyrolysis oven (10) linking to each other through the pipeline, its characterized in that: the gas-gas heat exchanger (3) consists of a gas collection drum (2) and a fin tube bundle (4), the gas collection drum (2) comprises an upper cylindrical horizontally-arranged drum and a lower cylindrical horizontally-arranged drum, cold air and hot air are collected and gathered by the upper and lower gas collection drums, high-temperature flue gas transversely enters and exits, a shell of the fin tube bundle (4) is provided with heat collection fins, the fin tube bundle (4) is vertically arranged to exchange heat with the flue gas of a transverse boiler, the gas-gas heat exchanger (3) is arranged outside a heat source chamber close to the boiler, the upper end of the gas-gas heat exchanger is connected with cold primary air (1), the lower end of the gas-gas heat exchanger is connected with a urea pyrolysis furnace (10) through a pipeline, an electric heater (7) is arranged on an outlet hot air (8) pipeline, a bypass pipe (10) of the urea pyrolysis furnace adopts a vertical cylindrical barrel, hot air enters the urea pyrolysis furnace (10) from the top after heat exchange, 50% of urea solution is sprayed into the urea pyrolysis furnace (10) through a spray gun arranged on the side wall of the barrel diagonally, the ammonia-air mixed gas (11) generated by hot air pyrolysis is discharged from the bottom of the urea pyrolysis furnace (10) and enters the subsequent denitration reaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023141076.6U CN215086173U (en) | 2020-12-23 | 2020-12-23 | External heating urea pyrolysis denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023141076.6U CN215086173U (en) | 2020-12-23 | 2020-12-23 | External heating urea pyrolysis denitration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215086173U true CN215086173U (en) | 2021-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023141076.6U Active CN215086173U (en) | 2020-12-23 | 2020-12-23 | External heating urea pyrolysis denitration device |
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|---|---|
| CN (1) | CN215086173U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114644349A (en) * | 2022-04-26 | 2022-06-21 | 贵州黔东电力有限公司 | Denitration pyrolysis system utilizing pure flue gas for heating under full-load section |
| CN114733341A (en) * | 2022-03-15 | 2022-07-12 | 华电电力科学研究院有限公司 | System and method for preventing crystallization blockage of denitration urea pyrolysis furnace of gas turbine |
-
2020
- 2020-12-23 CN CN202023141076.6U patent/CN215086173U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114733341A (en) * | 2022-03-15 | 2022-07-12 | 华电电力科学研究院有限公司 | System and method for preventing crystallization blockage of denitration urea pyrolysis furnace of gas turbine |
| CN114644349A (en) * | 2022-04-26 | 2022-06-21 | 贵州黔东电力有限公司 | Denitration pyrolysis system utilizing pure flue gas for heating under full-load section |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An External Heated Urea Pyrolysis Denitration Device Effective date of registration: 20221212 Granted publication date: 20211210 Pledgee: Dalian Branch of Shanghai Pudong Development Bank Co.,Ltd. Pledgor: DALIAN BEST ENVIRONMENT EQUIPMENT Co.,Ltd. Registration number: Y2022980026415 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20240103 Granted publication date: 20211210 Pledgee: Dalian Branch of Shanghai Pudong Development Bank Co.,Ltd. Pledgor: DALIAN BEST ENVIRONMENT EQUIPMENT Co.,Ltd. Registration number: Y2022980026415 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An external heating urea pyrolysis denitrification device Granted publication date: 20211210 Pledgee: Dalian Branch of Shanghai Pudong Development Bank Co.,Ltd. Pledgor: DALIAN BEST ENVIRONMENT EQUIPMENT Co.,Ltd. Registration number: Y2024980001872 |