CN112169593A - Accurate pyrolysis device that directly spouts suitable for combustion engine SCR denitration - Google Patents
Accurate pyrolysis device that directly spouts suitable for combustion engine SCR denitration Download PDFInfo
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- CN112169593A CN112169593A CN202011248460.8A CN202011248460A CN112169593A CN 112169593 A CN112169593 A CN 112169593A CN 202011248460 A CN202011248460 A CN 202011248460A CN 112169593 A CN112169593 A CN 112169593A
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- direct injection
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- metering valve
- injection pyrolysis
- urea solution
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 51
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 44
- 239000007924 injection Substances 0.000 claims abstract description 44
- 239000007921 spray Substances 0.000 claims abstract description 36
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000004202 carbamide Substances 0.000 claims abstract description 28
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000000243 solution Substances 0.000 claims abstract description 22
- 239000000523 sample Substances 0.000 claims abstract description 16
- 238000000738 capillary electrophoresis-mass spectrometry Methods 0.000 claims abstract description 12
- 239000003054 catalyst Substances 0.000 claims abstract description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003546 flue gas Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 239000002918 waste heat Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000007689 inspection Methods 0.000 abstract 4
- 229910021529 ammonia Inorganic materials 0.000 description 7
- 238000005192 partition Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001754 furnace pyrolysis Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses an accurate direct injection pyrolysis device suitable for SCR denitration of a combustion engine, wherein a direct injection pyrolysis spray gun group, a catalyst layer and all probes in inspection CEMS9 are sequentially arranged along the flow direction of flue gas, a flue at the outlet of the combustion engine is divided into a plurality of subareas, one subarea corresponds to one probe, a metering valve group and a plurality of direct injection pyrolysis spray guns in the inspection CEMS, one probe in the inspection CEMS, the corresponding metering valve group and the direct injection pyrolysis spray guns are positioned in the corresponding subareas, a urea solution pipeline and a demineralized water pipeline are communicated with inlets of all metering valve groups, outlets of all metering valve groups are communicated with inlets of the corresponding direct injection pyrolysis spray guns, an output end of the inspection CEMS is communicated with an input end of a control system, an output end of the control system is connected with control ends of all metering valve groups, the device realizes accurate control of boiler nitrogen oxide emission, and has simple equipment, the maintenance amount is small.
Description
Technical Field
The invention belongs to the technical field of SCR denitration, and relates to an accurate direct injection pyrolysis device suitable for SCR denitration of a gas turbine.
Background
Most of the existing gas turbine waste heat boiler SCR denitration devices in China adopt liquid ammonia or ammonia water to prepare reducing agents, and liquid ammonia is easy to leak and cause explosion in the links of transportation and storage, so that the state energy agency sends out notices respectively in 2019 and 2020, and requires power generation enterprises to actively develop major hazard source treatment in liquid ammonia tank areas and accelerate the progress of urea replacement, upgrading and transformation.
The prior art for preparing ammonia from urea comprises the art for preparing ammonia from urea through pyrolysis and hydrolysis. Relatively speaking, the two technologies have complex systems and large operation and maintenance amount, and cannot realize accurate control on the emission of the nitrogen oxides of the boiler.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an accurate direct injection pyrolysis device suitable for SCR denitration of a combustion engine, which realizes accurate control of boiler nitrogen oxide emission, and has simple equipment and small maintenance amount.
In order to achieve the above purpose, the accurate direct injection pyrolysis device suitable for the SCR denitration of the combustion engine comprises a metering module, a urea solution pipeline, a desalted water pipeline, a direct injection pyrolysis spray gun group, a combustion engine outlet flue, a catalyst layer and a patrol CEMS9, wherein the metering module comprises a plurality of metering valve groups, wherein each probe in the direct injection pyrolysis spray gun group, the catalyst layer and the patrol CEMS9 is sequentially arranged along the flow direction of flue gas, the combustion engine outlet flue is divided into a plurality of partitions, one partition corresponds to one probe, one metering valve group and a plurality of direct injection pyrolysis spray guns in the patrol CEMS, one probe in the patrol CEMS, the corresponding metering valve group and the corresponding direct injection pyrolysis spray guns are all positioned in the corresponding partitions, the urea solution pipeline and the desalted water pipeline are communicated with inlets of the metering valve groups, and outlets of the metering valve groups are communicated with inlets of the corresponding direct injection pyrolysis spray guns, the output end of the patrol CEMS is communicated with the input end of the control system, and the output end of the control system is connected with the control end of each metering valve group.
The metering valve group comprises a first manual valve, a second manual valve, a mixer, an automatic regulating valve and a self-operated pressure reducing valve, wherein a urea solution pipeline is communicated with an inlet of the mixer through the first manual valve and the automatic regulating valve, a demineralized water pipeline is communicated with an inlet of the mixer through the second manual valve and the self-operated pressure reducing valve, an outlet of the mixer is communicated with an inlet of a direct injection pyrolysis spray gun, and a control system is connected with a control end of the automatic regulating valve.
The number of the direct injection pyrolysis spray guns in the same subarea is two.
The cross-sectional dimensions of the partitions are the same.
During operation, the direct injection pyrolysis spray gun atomizes and sprays urea solution, the urea solution is pyrolyzed by using the heat of high-temperature flue gas, ammonia gas generated after pyrolysis and nitric oxide in the flue gas are mixed and then enter a waste heat boiler, and denitration reaction is carried out on the surface of the catalyst.
And during operation, the urea solution flow of the direct injection pyrolysis spray gun is correspondingly adjusted according to the data detected by each probe.
The invention has the following beneficial effects:
when the accurate direct injection pyrolysis device suitable for SCR denitration of the gas turbine is in specific operation, high-temperature flue gas in an inlet flue of a waste heat boiler of the gas turbine is used for heating and decomposing urea solution, compared with the traditional urea pyrolysis furnace pyrolysis technology, the accurate direct injection pyrolysis device does not need to be provided with a urea pyrolysis furnace, a high-temperature dilution fan, an ammonia injection grid, a manual butterfly valve and other equipment, and is simple in system and low in energy consumption; compared with the prior urea hydrolysis technology, the device does not need a hydrolysis reactor, a high-temperature dilution fan, an ammonia injection grid, a manual butterfly valve and other equipment, and has the advantages of simple system, high response speed and low energy consumption. At the same time, the present invention canThe method is better suitable for the characteristic of high starting and stopping speed of the gas turbine, and can realize rapid denitration in a full-load section. In addition, when the ammonia injection amount is controlled, the invention adopts the ideas of subarea detection and subarea control, so that the flow of the urea solution injected by subareas can be quickly adjusted under different working conditions, and further, good NH (ammonia) at the inlet section of the catalyst is obtained3The distribution uniformity of the mol ratio of the NOx enables the distribution of the nitrogen oxides at the outlet of the waste heat boiler to be very uniform, the accurate control of the emission of the nitrogen oxides of the boiler is realized, the equipment is simple, and the maintenance amount is small.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a metering module 1 of the present invention;
fig. 3 is a schematic view of a direct injection pyrolysis spray gun stack 2 of the present invention.
Wherein, 1 is a metering module, 2 is a direct injection thermal spray gun group, 3 is a gas turbine outlet flue, 4 is a catalyst layer, 5 is a first manual valve, 6 is an automatic regulating valve, 7 is a mixer, 8 is a self-operated pressure reducing valve, 9 is a survey CEMS, and 10 is a probe.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 to 3, the accurate direct injection pyrolysis device suitable for SCR denitration of a combustion engine of the present invention includes a metering module 1, a urea solution pipeline, a demineralized water pipeline, a direct injection pyrolysis spray gun group 2, a combustion engine outlet flue 3, a catalyst layer 4, and a patrol CEMS9, wherein the metering module 1 includes a plurality of metering valve groups, wherein each probe 10 in the direct injection pyrolysis spray gun group 2, the catalyst layer 4, and the patrol CEMS9 is sequentially disposed along a flue gas flow direction, the combustion engine outlet flue 3 is divided into a plurality of partitions, one partition corresponds to one probe 10 in the patrol CEMS9, one metering valve group, and a plurality of direct injection pyrolysis spray guns, one probe 10 in the patrol CEMS9, the corresponding metering valve group metering spray gun, and the direct injection pyrolysis spray gun are located in the corresponding partition, the urea solution pipeline and the demineralized water pipeline are communicated with inlets of each metering valve group, outlets of each pyrolysis metering valve group are communicated with inlets of the corresponding direct injection pyrolysis spray guns, the output end of the patrol CEMS9 is communicated with the input end of the control system, and the output end of the control system is connected with the control end of each metering valve group.
Metering valve group includes first manual valve 5, the manual valve of second, blender 7, automatically regulated valve 6 and self-operated relief pressure valve 8, and wherein, the urea solution pipeline is linked together through the entry of first manual valve 5 and automatically regulated valve 6 with blender 7, and the demineralized water pipeline is linked together through the entry of the manual valve of second and self-operated relief pressure valve 8 with blender 7, and the export of blender 7 is linked together with the entry of directly spouting pyrolysis spray gun, and control system is connected with automatically regulated valve 6's control end.
The number of the direct-injection pyrolysis spray guns in the same subarea is two, and the cross section sizes of all the subareas are the same.
Directly spout the pyrolysis spray gun and spout after atomizing urea solution, utilize the heat of high temperature flue gas with urea solution pyrolysis, the ammonia that generates after the pyrolysis gets into the exhaust-heat boiler with nitrogen oxide mixture back in the flue gas, takes place denitration reaction on the catalyst surface. The direct injection pyrolysis spray gun is arranged in a subarea mode, the outlet of the waste heat boiler is correspondingly arranged in a subarea mode for inspecting the CEMS9, and the urea solution flow of the direct injection pyrolysis spray gun is correspondingly adjusted according to the data detected by the probes.
It is to be understood that the above embodiments are merely examples for clarity of description and are not to be construed as limiting the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (8)
1. An accurate direct injection pyrolysis device suitable for SCR denitration of a combustion engine is characterized by comprising a metering module (1), a urea solution pipeline, a desalted water pipeline, a direct injection pyrolysis spray gun group (2), a combustion engine outlet flue (3), a catalyst layer (4) and a patrol CEMS (9), wherein the metering module (1) comprises a plurality of metering valve groups, each probe (10) in the direct injection pyrolysis spray gun group (2), the catalyst layer (4) and the patrol CEMS (9) are sequentially arranged along the flow direction of flue gas, the combustion engine outlet flue (3) is divided into a plurality of subareas, one subarea corresponds to one probe (10) in the patrol CEMS (9), one metering valve group and a plurality of direct injection pyrolysis spray guns, one probe (10) in the patrol CEMS (9) and the corresponding metering valve group and direct injection pyrolysis spray guns are all located in the corresponding subareas, the urea solution pipeline and the desalted water pipeline are communicated with inlets of the metering valve groups, the outlet of each metering valve group is communicated with the inlet of the corresponding direct injection pyrolysis spray gun, the output end of the patrol CEMS (9) is communicated with the input end of the control system, and the output end of the control system is connected with the control end of each metering valve group.
2. The device of claim 1, wherein the metering valve set comprises a mixer (7), an automatic regulating valve (6) and a self-operated pressure reducing valve (8), wherein a urea solution pipeline is communicated with an inlet of the mixer (7) through the automatic regulating valve (6), a demineralized water pipeline is communicated with an inlet of the mixer (7) through the self-operated pressure reducing valve (8), an outlet of the mixer (7) is communicated with an inlet of the direct injection pyrolysis spray gun, and a control system is connected with a control end of the automatic regulating valve (6).
3. The apparatus according to claim 2, wherein the urea solution conduit is connected to the inlet of the mixer (7) via a first manual valve (5) and a self-regulating valve (6).
4. The apparatus of claim 3, wherein the demineralized water pipeline is communicated with the inlet of the mixer (7) through a self-operated pressure reducing valve (8).
5. The apparatus of claim 1, wherein the number of direct injection pyrolysis spray guns in a zone is two.
6. The apparatus of claim 1, wherein the zones have the same cross-sectional dimensions.
7. The accurate direct injection pyrolysis device suitable for SCR denitration of a combustion engine of claim 1, wherein in operation, the direct injection pyrolysis spray gun atomizes and injects the urea solution, the urea solution is pyrolyzed by using heat of high-temperature flue gas, and ammonia gas generated after pyrolysis and nitrogen oxide in the flue gas are mixed and then enter a waste heat boiler, so that denitration reaction occurs on the surface of the catalyst.
8. The apparatus of claim 1, wherein during operation, the flow rate of the urea solution is controlled by adjusting the direct injection thermal spray gun according to data detected by each probe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011248460.8A CN112169593A (en) | 2020-11-10 | 2020-11-10 | Accurate pyrolysis device that directly spouts suitable for combustion engine SCR denitration |
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| CN202011248460.8A CN112169593A (en) | 2020-11-10 | 2020-11-10 | Accurate pyrolysis device that directly spouts suitable for combustion engine SCR denitration |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113230871A (en) * | 2021-05-08 | 2021-08-10 | 西安热工研究院有限公司 | Spraying layer partition adjusting desulfurization absorption tower based on concentration field distribution at outlet of absorption tower |
| WO2021184786A1 (en) * | 2020-03-16 | 2021-09-23 | 西安热工研究院有限公司 | Urea direct-injection pyrolysis denitrification device arranged inside outlet flue duct of gas turbine |
| CN115144231A (en) * | 2022-06-21 | 2022-10-04 | 浙江兴核智拓科技有限公司 | Urea direct injection partition measurement and control system suitable for denitration device of gas turbine waste heat boiler |
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| CN115144231A (en) * | 2022-06-21 | 2022-10-04 | 浙江兴核智拓科技有限公司 | Urea direct injection partition measurement and control system suitable for denitration device of gas turbine waste heat boiler |
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