CN211837273U - Arrange inside urea of combustion engine export flue and directly spout pyrolysis denitrification facility - Google Patents
Arrange inside urea of combustion engine export flue and directly spout pyrolysis denitrification facility Download PDFInfo
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- CN211837273U CN211837273U CN202020330041.8U CN202020330041U CN211837273U CN 211837273 U CN211837273 U CN 211837273U CN 202020330041 U CN202020330041 U CN 202020330041U CN 211837273 U CN211837273 U CN 211837273U
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Abstract
The utility model discloses a urea direct injection pyrolysis denitration device arranged in a gas turbine outlet flue, wherein the gas turbine outlet flue is communicated with an inlet of a chimney through a waste heat boiler, a catalyst module is arranged in the waste heat boiler, each urea direct injection pyrolysis spray gun is positioned in the gas turbine outlet flue, each urea direct injection pyrolysis spray gun is uniformly distributed on the same cross section of the gas turbine outlet flue, one metering module corresponds to one urea direct injection pyrolysis spray gun, the metering module comprises a mixer, a first manual valve, a second manual valve, an automatic regulating valve and a self-operated pressure reducing valve, a urea solution input pipeline is communicated with the inlet of the mixer through the first manual valve and the automatic regulating valve, a demineralized water input pipeline is communicated with the inlet of the mixer through the second manual valve and the self-operated pressure reducing valve, and the outlet of the mixer is communicated with the inlet of the urea direct injection pyrolysis spray gun, the device can realize automatic partition adjustment and has low energy consumption.
Description
Technical Field
The utility model belongs to the technical field of the SCR denitration, a arrange inside urea of gas turbine outlet flue and directly spout pyrolysis denitration device is related to.
Background
The gas-steam combined cycle power generation technology is widely applied in China due to the characteristics of cleanness and high efficiency. In recent years, with the improvement of national environmental protection standards, more strict requirements are put on NOx emission of combustion engines in many regions, such as Shenfu issued by people's government in Shenzhen city [2017]No. 1 document 'Shenzhen city atmospheric environment quality promotion plan (2017 and 2020)' requires that NOx emission concentration of newly-built gas generating set is controlled to be 15mg/m3The NOx emission concentration of the grade E gas generator set is controlled to be 25mg/m before 20203The NOx emission concentration of the F-grade gas generator set is controlled to be 15mg/m3The following. In such cases, it is difficult to meet NOx emission requirements by means of gas turbine-only low-nitrogen combustion technology. The SCR denitration technology is a feasible scheme.
Generally, the reducing agent for the SCR denitration reaction can be selected from liquid ammonia, ammonia water and urea. The ammonia production technology by liquid ammonia evaporation is mature and reliable, the investment and operation cost is low, but the liquid ammonia is a great hazard source, and the application of the ammonia production technology by liquid ammonia is limited. The ammonia water is generally 20% ammonia water, so that the transportation cost is high, the source of the ammonia water is not wide, and the application of the ammonia water-to-ammonia technology is limited to a certain extent. Therefore, the urea-to-ammonia process is receiving more and more attention in the SCR denitration technology. The prior art for preparing ammonia from urea comprises the art for preparing ammonia from urea through pyrolysis and hydrolysis. For a gas-steam combined cycle unit, the traditional urea pyrolysis ammonia production technology can lead high-temperature flue gas out of a flue at an outlet of a gas turbine by a high-temperature dilution fan and send the high-temperature flue gas into a urea pyrolysis furnace, atomized urea solution is sprayed into the urea pyrolysis furnace, the urea solution is pyrolyzed by utilizing the heat of the high-temperature flue gas to generate a reducing agent required by denitration reaction, then the reducing agent is sent into an ammonia spraying grid arranged in a waste heat boiler, and the reducing agent is sprayed out of the ammonia spraying grid and mixed with the flue gas to generate the denitration reaction on the surface of a catalyst. The urea hydrolysis ammonia production technology is characterized in that urea solution is subjected to hydrolysis reaction in a hydrolysis reactor by using steam with certain temperature and pressure (0.4-0.6 MPa and 140-160 ℃), then high-temperature flue gas is led out in a waste heat boiler through a high-temperature dilution fan, the high-temperature flue gas and hydrolysis reaction product gas are mixed in a mixer and then enter an ammonia spraying grid arranged in the waste heat boiler, and the mixed gas is sprayed out from the ammonia spraying grid and mixed with the flue gas to generate denitration reaction on the surface of a catalyst. The two urea ammonia production technologies have the advantages of more required equipment, complex system, large operation and maintenance workload, certain energy consumption and higher initial investment for realizing the partition regulation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a arrange at the inside urea of combustion engine export flue directly spout pyrolysis denitration device, the device can realize automatic subregion and adjust, and the energy consumption is lower.
In order to achieve the purpose, the urea direct injection pyrolysis denitration device arranged in the gas turbine outlet flue comprises the gas turbine outlet flue, a urea solution input pipeline, a desalted water input pipeline, a waste heat boiler, a chimney, a plurality of urea direct injection pyrolysis spray guns and a plurality of metering modules;
the gas turbine export flue is linked together through the entry of exhaust-heat boiler with the chimney, wherein, is provided with catalyst module among the exhaust-heat boiler, and each urea is directly spouted the pyrolysis spray gun and all is located gas turbine export flue, and each urea is directly spouted the pyrolysis spray gun and is followed evenly distributed on the same cross section of gas turbine export flue, and a metering module corresponds a urea and directly spouts the pyrolysis spray gun, metering module includes blender, first manual valve, the manual valve of second, automatically regulated valve and self-operated relief pressure valve, and urea solution input pipeline is linked together through the entry of first manual valve and automatically regulated valve with the blender, and demineralized water input pipeline is linked together through the manual valve of second and self-operated relief pressure valve and the entry of blender, and the export of blender is linked together with the urea entry of directly.
The spraying direction of the urea direct-spraying pyrolysis spray gun is the same as the flowing direction of the flue gas.
The mixed solution sprayed by each urea direct-spraying pyrolysis spray gun covers the whole cross section of the outlet flue of the combustion engine.
When the catalyst module works, the flow of the solution entering each urea direct injection pyrolysis spray gun is automatically adjusted according to the distribution condition of NOx concentration on the cross section of the outlet of the waste heat boiler, so that NH on the cross section of the inlet of the catalyst module3The mol ratio of/NOx is uniform.
The utility model discloses following beneficial effect has:
the utility model discloses a arrange the inside direct injection pyrolysis denitrification facility of urea of combustion engine export flue when concrete operation, each direct injection pyrolysis spray gun of urea all is located combustion engine export flue, the demineralized water of demineralized water input pipeline output passes through the manual valve of second and the pressure-regulating of formula of relying on oneself relief pressure valve in proper order and enters into the blender, the urea solution of urea solution input pipeline output passes through the manual valve of first and the automatic regulating valve automatically regulated in proper order and enters into the blender, the mixed solution of blender output is sprayed into combustion engine export flue and is heated pyrolysis through the direct injection pyrolysis spray gun of urea, compare with traditional urea pyrolysis or urea hydrolysis technology, the utility model does not need equipment such as urea pyrolysis stove or hydrolysis reactor, high temperature dilution fan, ammonia injection grid and the preceding valves of ammonia injection grid, the system is simple, the energy consumption is lower, through the mixed solution independent control of each direct injection pyrolysis spray gun output of urea, so as to realize automatic zone adjustment and obtain good catalyst inlet section NH under different working conditions3Uniformity of distribution of mol ratio of NOx, and start-up and working condition variation of denitration deviceIt should be fast.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the metering module 1 of the present invention;
fig. 3 is a distribution diagram of each urea direct injection pyrolysis spray gun 2 of the present invention.
The system comprises a metering module 1, a urea direct injection pyrolysis spray gun 2, a combustion engine outlet flue 3, a catalyst module 4, a first manual valve 51, a second manual valve 52, an automatic regulating valve 6, a mixer 7, a self-operated pressure reducing valve 8, a waste heat boiler 9, a chimney 10, a urea solution input pipeline 11 and a desalted water input pipeline 12.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, fig. 2 and fig. 3, the urea direct injection pyrolysis denitration device disposed inside the gas turbine outlet flue of the present invention includes a gas turbine outlet flue 3, a urea solution input pipeline 11, a demineralized water input pipeline 12, a waste heat boiler 9, a chimney 10, a plurality of urea direct injection pyrolysis spray guns 2 and a plurality of metering modules 1; the gas turbine outlet flue 3 is communicated with the inlet of a chimney 10 through a waste heat boiler 9, wherein the waste heat boiler 9 is provided with a catalyst module 4, each urea direct injection pyrolysis spray gun 2 is positioned in the gas turbine outlet flue 3, and the urea direct-injection pyrolysis spray guns 2 are uniformly distributed on the same cross section along the gas turbine outlet flue 3, one metering module 1 corresponds to one urea direct-injection pyrolysis spray gun 2, metering module 1 includes blender 7, first manual valve 51, the manual valve 52 of second, automatically regulated valve 6 and self-operated relief pressure valve 8, and urea solution input pipeline 11 is linked together through the entry of first manual valve 51 and automatically regulated valve 6 with blender 7, and demineralized water input pipeline 12 is linked together through the entry of the manual valve 52 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 the direct injection pyrolysis spray gun 2 of urea.
The spraying direction of the urea direct-spraying pyrolysis spray gun 2 is the same as the flowing direction of the flue gas, and the mixed solution sprayed by each urea direct-spraying pyrolysis spray gun 2 coversWhen the whole cross section of the gas turbine outlet flue 3 is covered, the flow of the solution entering each urea direct injection pyrolysis spray gun 2 is adjusted according to the distribution condition of NOx concentration on the cross section of the waste heat boiler 3 during operation, so that NH on the inlet section of the catalyst module 43The mol ratio of/NOx is uniform.
The demineralized water output by the demineralized water input pipeline 12 sequentially enters the mixer 7 through the pressure regulation of the second manual valve 52 and the self-operated pressure reducing valve 8, the urea solution with the mass concentration of 30% -50% output by the urea solution input pipeline 11 sequentially enters the mixer 7 through the automatic regulation of the first manual valve 51 and the automatic regulating valve 6, the mixed solution output by the mixer 7 is sprayed into the outlet flue 3 of the combustion engine through the urea direct injection pyrolysis spray gun 2 for heating and pyrolysis, and then enters the waste heat boiler 9 along with the flue gas, and then the SCR denitration reaction is carried out under the catalytic action of the catalyst module 4 to generate harmless N2And H2O, is discharged to the atmosphere via a stack 10.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit 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 changes and modifications can be made without departing from the scope of the invention.
Claims (4)
1. A urea direct-injection pyrolysis denitration device arranged in an outlet flue of a combustion engine is characterized by comprising the outlet flue (3) of the combustion engine, a urea solution input pipeline (11), a desalted water input pipeline (12), a waste heat boiler (9), a chimney (10), a plurality of urea direct-injection pyrolysis spray guns (2) and a plurality of metering modules (1);
the inlet of a chimney (10) is communicated with an outlet flue (3) of the combustion engine through a waste heat boiler (9), wherein a catalyst module (4) is arranged in the waste heat boiler (9), each urea direct-injection pyrolysis spray gun (2) is positioned in the outlet flue (3) of the combustion engine, each urea direct-injection pyrolysis spray gun (2) is uniformly distributed on the same cross section of the outlet flue (3) of the combustion engine, one metering module (1) corresponds to one urea direct-injection pyrolysis spray gun (2), the metering module (1) comprises a mixer (7), a first manual valve (51), a second manual valve (52), an automatic regulating valve (6) and a self-operated reducing valve (8), a urea solution input pipeline (11) is communicated with the inlet of the mixer (7) through the first manual valve (51) and the automatic regulating valve (6), a demineralized water input pipeline (12) is communicated with the inlet of the mixer (7) through the second manual valve (52) and the self-operated reducing valve (8), the outlet of the mixer (7) is communicated with the inlet of the urea direct injection pyrolysis spray gun (2).
2. The urea direct-injection pyrolysis denitration device arranged inside an outlet flue of a combustion engine according to claim 1, characterized in that the injection direction of the urea direct-injection pyrolysis spray gun (2) is the same as the flow direction of flue gas.
3. The urea direct-injection pyrolysis denitration device arranged inside an outlet flue of a combustion engine according to claim 1, characterized in that the mixed solution injected by each urea direct-injection pyrolysis spray gun (2) covers the entire cross section of the outlet flue (3) of the combustion engine.
4. The urea direct-injection thermal denitration device arranged in the outlet flue of the combustion engine according to claim 1, wherein in operation, the flow rate of the solution entering each urea direct-injection thermal denitration spray gun (2) is automatically adjusted according to the distribution of the NOx concentration on the outlet cross section of the waste heat boiler (9), so that NH is arranged on the inlet cross section of the catalyst module (4)3The mol ratio of/NOx is uniform.
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| CN202020330041.8U CN211837273U (en) | 2020-03-16 | 2020-03-16 | Arrange inside urea of combustion engine export flue and directly spout pyrolysis denitrification facility |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111229039A (en) * | 2020-03-16 | 2020-06-05 | 西安西热锅炉环保工程有限公司 | Arrange inside urea of combustion engine export flue and directly spout pyrolysis denitrification facility |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111229039A (en) * | 2020-03-16 | 2020-06-05 | 西安西热锅炉环保工程有限公司 | Arrange inside urea of combustion engine export flue and directly spout pyrolysis denitrification facility |
| 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 |
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