CN216395900U - Energy-saving urea hydrolysis ammonia preparation denitrification facility based on combustion engine SCR denitration - Google Patents
Energy-saving urea hydrolysis ammonia preparation denitrification facility based on combustion engine SCR denitration Download PDFInfo
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- CN216395900U CN216395900U CN202121640418.0U CN202121640418U CN216395900U CN 216395900 U CN216395900 U CN 216395900U CN 202121640418 U CN202121640418 U CN 202121640418U CN 216395900 U CN216395900 U CN 216395900U
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Abstract
The utility model discloses an energy-saving urea hydrolysis ammonia production denitration device based on gas turbine SCR denitration, which comprises a urea solution preparation system, a urea hydrolysis ammonia production reactor and a denitration reaction system, wherein the urea hydrolysis ammonia production reactor is communicated with an ammonia injection grid through an ammonia-smoke mixer. The method has the advantages that the urea hydrolysis ammonia preparation is used for SCR denitration of the gas turbine, so that the problems of corrosion and crystallization blockage of a high-temperature fan for preparing ammonia by pyrolysis of the urea pyrolysis furnace are solved; the heating ammonia production of the urea hydrolysis ammonia production reactor is carried out by using the waste heat of the flue gas of the waste heat boiler to replace a steam coil or electric tracing, so that the heating energy consumption of the hydrolyzer for producing ammonia is saved; the high-temperature flue gas and the finished gas are mixed and then are conveyed to an ammonia-flue gas mixer together, so that the temperature for conveying the finished gas is increased, and the risk of conveying blockage of a finished gas pipeline is reduced; high-temperature flue gas after heat exchange of the urea hydrolysis ammonia production reactor is conveyed to the urea solution dissolving tank and the urea solution storage tank for auxiliary heat tracing, so that the heat tracing energy consumption is reduced; the whole device is efficient, stable, energy-saving and suitable for popularization and use.
Description
Technical Field
The utility model belongs to the technical field of SCR denitration, and particularly relates to an energy-saving type urea hydrolysis ammonia preparation denitration device based on combustion engine SCR denitration.
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 increase of national environmental standards, many regions have made stricter demands on NOx emissions of combustion engines, and in such a case, it is difficult to achieve the NOx emission demands only by the low nitrogen combustion technology of a gas turbine. 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 severely limited. The ammonia water generally selects 20% mass concentration ammonia water as raw material, the transportation cost is high, the source of the ammonia water is not wide, and the application of ammonia water ammonia-making technology is limited to a certain extent. The urea ammonia preparation has certain safety, and the SCR denitration technology is concerned more and more.
For a gas-steam combined cycle unit, urea pyrolysis and hydrolysis ammonia production can both meet the SCR denitration of a gas turbine, the urea pyrolysis ammonia production technology can lead high-temperature flue gas out of a flue at the outlet of the 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, and the heat of the high-temperature flue gas is utilized to pyrolyze the urea solution to generate a reducing agent required by the denitration reaction. The main problems of the urea pyrolysis technology are that the energy consumption is large and the operation cost is high. The urea conversion rate in the pyrolysis furnace is low due to uneven flow field and temperature distribution in the pyrolysis furnace, the side reaction is complex, and the urea consumption is high. The energy consumption is greatly reduced compared with the energy consumption for preparing ammonia by hydrolyzing urea, but a large amount of high-temperature steam is still needed for preparing ammonia by heating a hydrolyzer, and the high-temperature flue gas of a gas turbine and other hot boilers has no dust and high heat, and can be fully utilized, so that the energy consumption for preparing ammonia by hydrolyzing is reduced to the maximum extent. Meanwhile, the urea hydrolysis finished product gas often cannot meet the requirement due to heat tracing temperature, and hydrolysis reverse reaction occurs, so that ammonium carbamate is generated, and a pipeline system is corroded and blocked.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model aims to provide an energy-saving type ammonia denitration device for urea hydrolysis based on SCR denitration of a combustion engine.
In order to achieve the purpose and achieve the technical effect, the utility model adopts the technical scheme that:
the utility model provides an energy-saving urea hydrolysis ammonia production denitrification facility based on denitration of gas turbine SCR, includes urea solution preparation system, urea hydrolysis ammonia production reactor and the denitration reaction system that communicates in proper order, denitration reaction system includes along flue gas flow direction ammonia injection grid and the denitration catalyst that sets gradually, and urea hydrolysis ammonia production reactor passes through ammonia cigarette blender and ammonia injection grid intercommunication.
Further, urea solution preparation system includes urea warehouse, urea solution dissolving tank, urea solution feed pump, urea solution holding vessel, measurement distribution tank and hydrolysis catalyst holding vessel, urea warehouse, urea solution dissolving tank and urea solution holding vessel communicate in proper order, set up urea solution feed pump on the pipeline between urea solution dissolving tank and the urea solution holding vessel, and urea solution holding vessel and hydrolysis catalyst holding vessel communicate urea hydrolysis ammonia production reactor again with measurement distribution tank 5 intercommunication respectively.
Further, urea hydrolysis system ammonia reactor export sets up first ammonia cigarette blender, along the flue gas flow direction, and first ammonia cigarette blender feeds through the ammonia injection grid again with second ammonia cigarette blender intercommunication, and denitration reaction system passes through first high temperature fan and first ammonia cigarette blender intercommunication, and second ammonia cigarette blender and second high temperature fan intercommunication, second high temperature fan and denitration reaction system intercommunication.
Further, denitration reaction system includes exhaust-heat boiler and sets gradually guide plate, ammonia injection grid and denitration catalyst in the exhaust-heat boiler along the flue gas flow direction, urea hydrolysis ammonia production reactor closes on the arrangement with exhaust-heat boiler, outside flue gas passes through in the guide plate gets into the exhaust-heat boiler, high temperature flue gas III in the exhaust-heat boiler gets into in the first ammonia gas blender through first high temperature fan and then gets into in the second ammonia gas blender with the finished product gas of urea hydrolysis ammonia production reactor export in first ammonia gas blender after mixing, high temperature flue gas II in the exhaust-heat boiler gets into in the second ammonia gas blender through second high temperature fan, get into in the exhaust-heat boiler through second ammonia gas blender and ammonia injection grid, utilize the denitration catalyst to accomplish the denitration.
Further, the exhaust-heat boiler is connected with a high-temperature flue gas heat exchange coil at the bottom of the urea hydrolysis ammonia production reactor through a third high-temperature fan, high-temperature flue gas I in the exhaust-heat boiler is blown into the high-temperature flue gas heat exchange coil through the third high-temperature fan and is used for providing energy for hydrolysis ammonia production of the urea hydrolysis ammonia production reactor, the pressure of a gas-liquid two-phase balance system in the urea hydrolysis ammonia production reactor is 0.48-0.6 MPa, and the temperature is 130-150 ℃.
Furthermore, the outer peripheries of the urea solution dissolving tank and the urea solution storage tank are respectively coated with heat-insulating cotton, a flue gas heat exchange coil and an electric tracing band are arranged in the heat-insulating cotton, and the inlet of the flue gas heat exchange coil is connected with the outlet of a high-temperature flue gas heat exchange coil at the bottom of the urea hydrolysis ammonia production reactor.
Further, the thickness of the heat preservation cotton is not more than 15 mm.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model discloses an energy-saving urea hydrolysis ammonia production denitration device based on gas turbine SCR denitration, which comprises a urea solution preparation system, a urea hydrolysis ammonia production reactor and a denitration reaction system which are sequentially communicated, wherein the denitration reaction system comprises an ammonia injection grid and a denitration catalyst which are sequentially arranged along the flow direction of flue gas, and the urea hydrolysis ammonia production reactor is communicated with the ammonia injection grid through an ammonia-smoke mixer. The method for preparing ammonia by urea hydrolysis is used for SCR denitration of the gas turbine, so that the problems of corrosion and crystallization blockage of a high-temperature fan for preparing ammonia by urea pyrolysis in a urea pyrolysis furnace are solved; the heating ammonia production of the urea hydrolysis ammonia production reactor is carried out by using the waste heat of the waste heat boiler flue gas (high-temperature flue gas I of the gas turbine power plant) to replace a steam coil or electric tracing, so that the heating energy consumption of the hydrolyzer ammonia production is saved; the high-temperature flue gas is introduced into the outlet of the urea hydrolysis ammonia production reactor, so that the high-temperature flue gas and the finished gas are conveniently mixed and then are conveyed to the ammonia-flue gas mixer together, the temperature for conveying the finished gas is increased, and the risk of conveying and blocking the finished gas pipeline is reduced; the finished product gas is diluted by directly utilizing the high-temperature flue gas, so that the hot air heat exchange dilution is avoided, and the energy consumption is saved; high-temperature flue gas after heat exchange of the urea hydrolysis ammonia production reactor is conveyed to the urea solution dissolving tank and the urea solution storage tank for auxiliary heat tracing, so that the heat tracing energy consumption of the urea solution dissolving tank and the urea solution storage tank is saved; the whole device is efficient, stable and energy-saving, and is suitable for industrial popularization and use.
Drawings
FIG. 1 is a schematic structural view of the present invention;
wherein, 1-urea storage; 2-urea solution dissolving tank; 3-urea solution feed pump; 4-urea solution storage tank; 5-a metering distribution tank; 6-hydrolysis catalyst storage tank; 7-urea hydrolysis ammonia production reactor; 8-a first ammonia fume mixer; 9-a first high temperature fan; 10-a baffle; 11-ammonia injection grid; 12-a denitration catalyst; 13-a waste heat boiler; 14-a second high temperature fan; 15-a third high temperature fan; 16-second ammonia fume mixer.
Detailed Description
The following detailed description of the embodiments of the present invention is provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, and to clearly and clearly define the scope of the present invention.
As shown in figure 1, an energy-saving urea hydrolysis ammonia production denitration device based on combustion engine SCR denitration comprises a urea storage bin 1, a urea solution dissolving tank 2, a urea solution feeding pump 3, a urea solution storage tank 4, a metering distribution tank 5, a hydrolysis catalyst storage tank 6, a urea hydrolysis ammonia production reactor 7, a first ammonia-smoke mixer 8, a first high-temperature fan 9, a guide plate 10, an ammonia injection grid 11, a denitration catalyst 12, a waste heat boiler 13, a second high-temperature fan 14, a third high-temperature fan 15 and a second ammonia-smoke mixer 16, wherein the urea storage bin 1, the urea solution dissolving tank 2 and the urea solution storage tank 4 are sequentially communicated, a urea solution feeding pump 3 is arranged on a pipeline between the urea solution dissolving tank 2 and the urea solution storage tank 4, the urea solution storage tank 4 and the hydrolysis catalyst storage tank 6 are respectively communicated with the metering distribution tank 5 and then communicated with the urea hydrolysis ammonia production reactor 7, a first ammonia-smoke mixer 8 is arranged at the outlet of the urea hydrolysis ammonia production reactor 7, the first ammonia-smoke mixer 8 is communicated with a second ammonia-smoke mixer 16 and then communicated with an ammonia injection grid 11 along the flow direction of smoke, a guide plate 10, the ammonia injection grid 11 and a denitration catalyst 12 are sequentially arranged in a waste heat boiler 13 along the flow direction of smoke, the first ammonia-smoke mixer 8 is communicated with a first high-temperature fan 9, high-temperature smoke III in the waste heat boiler 13 enters the first ammonia-smoke mixer 8 through the first high-temperature fan 9, the high-temperature smoke III is mixed with the finished product gas at the outlet of the urea hydrolysis ammonia production reactor 7 in the first ammonia-smoke mixer 8 and then enters a second ammonia-smoke mixer 16 and then enters the waste heat boiler 13 through the ammonia injection grid 11, the smoke enters the waste heat boiler 13 through the guide plate 10, denitration is completed by the denitration catalyst 12, the second high-temperature fan 14 is communicated with the second ammonia-smoke mixer 16, and high-temperature smoke II in the waste heat boiler 13 enters the second ammonia-smoke mixer 16 through a second high-temperature fan 14, the gas in the second ammonia-smoke mixer 16 is mixed with the gas from the first ammonia-smoke mixer 8 and then enters the waste heat boiler 13 through the ammonia spraying grid 11, and the high-temperature flue gas I in the waste heat boiler 13 is blown to the urea hydrolysis ammonia production reactor 7 through the third high-temperature fan 15 to provide energy for the urea hydrolysis ammonia production reactor 7 to produce ammonia through hydrolysis.
The metering and distributing tank 5 adopts the existing product, and only needs to ensure that the hydrolysis solution can be quantitatively output to the urea hydrolysis ammonia production reactor 7.
In order to ensure the uniformity of the distribution of the flue gas in the waste heat boiler 13, a plurality of sections of guide plates 10 are arranged at the inlet section of the waste heat boiler 13, so that the flue gas is fully distributed on the cross section of the whole flue, the included angle between two adjacent guide plates 10 is controlled within 40 degrees, and the outer surfaces of the guide plates 10 are coated with activated carbon adsorption layers with the thickness of 1-3 mm.
The urea hydrolysis ammonia production reactor 7 is arranged close to the waste heat boiler 13, so that the flue gas conveying distance is reduced, and the energy consumption loss is reduced.
The urea solution dissolving tank 2 and the urea solution storage tank 4 are externally and peripherally coated with heat preservation cotton respectively, a flue gas heat exchange coil and an electric tracing band are arranged in the heat preservation cotton, the thickness of the heat preservation cotton is not more than 15mm, the heat preservation effect is good, the urea particles are favorably and quickly dissolved, secondary crystallization and separation are prevented, an inlet of the flue gas heat exchange coil is connected with an outlet of a high-temperature flue gas heat exchange coil at the bottom of the urea hydrolysis ammonia production reactor 7, high-temperature flue gas I flows through the high-temperature flue gas heat exchange coil at the bottom of the urea hydrolysis ammonia production reactor 7, the pressure of a gas-liquid two-phase balance system in the urea hydrolysis ammonia production reactor 7 is kept to be 0.48-0.6 MPa, and the temperature is 130-150 ℃.
The hydrolysis catalyst solution is preferably sodium acetate solution, which can reduce the activation energy required by the hydrolysis reaction, thereby reducing the reaction temperature required by the hydrolysis reaction by about 10-30 ℃ and simultaneously improving the conversion rate of urea hydrolysis.
The working principle of the utility model is as follows:
urea particles are added into a urea solution dissolving tank 2 from a urea storage bin 1, the urea particles are dissolved into a urea solution with the mass concentration of 50% by using deionized water in the urea solution dissolving tank 2, then the urea solution is conveyed into a urea solution storage tank 4 through a urea solution feeding pump 3 and then enters a metering distribution tank 5, the urea solution in the metering distribution tank 5 and a hydrolysis catalyst solution from a hydrolysis catalyst storage tank 6 are uniformly mixed in the metering distribution tank 5 and pumped into a urea hydrolysis ammonia production reactor 7 according to the amount for hydrolysis ammonia production, a product gas generated by urea hydrolysis reaction is discharged from an outlet of the urea hydrolysis ammonia production reactor 7 and then mixed with a high-temperature flue gas III in a first ammonia-flue gas mixer 8 and then conveyed into a second ammonia-flue gas mixer 16, a first high-temperature fan 9 is used for accelerating the mixing of the product gas and the high-temperature flue gas III, and the product gas from the first ammonia-flue gas mixer 8 are mixed in the second ammonia-flue gas mixer 16, then enters a waste heat boiler 13 through an ammonia injection grid 11, completes denitration under the action of a denitration catalyst 12, and is discharged.
Urea hydrolysis to NH in urea hydrolysis ammonia production reactor 73、H2O and CO2The chemical reaction formula is as follows:
the chemical reaction formula (1) is the reverse reaction of urea production, the reaction rate is a function of temperature and concentration, the flue gas temperature of the high-temperature flue gas I generated after denitration catalysis of the waste heat boiler 13 is 250-350 ℃, and energy is provided for the hydrolysis reaction in the urea hydrolysis ammonia-making reactor 7.
The smoke temperature of the high-temperature smoke II is 140-160 ℃, and the high-temperature smoke II is mixed in the second ammonia-smoke mixer 16 and then is sent into the ammonia injection grid 11 so as to be uniformly injected.
The temperature of the high-temperature flue gas III is 160-180 ℃, and the temperature of the high-temperature flue gas III is increased to 140-160 ℃ after the high-temperature flue gas III and the finished product gas at the outlet of the urea hydrolysis ammonia-making reactor 7 are mixed in the first ammonia-flue gas mixer 8, so that the situation that the intermediate product generated by the hydrolysis reverse reaction blocks a conveying pipeline due to too low temperature in the conveying process of the finished product gas is avoided.
The parts of the utility model not specifically described can be realized by adopting the prior art, and the details are not described herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. The utility model provides an energy-saving urea hydrolysis ammonia production denitrification facility based on denitration of gas turbine SCR, a serial communication port, including the urea solution preparation system that communicates in proper order, urea hydrolysis ammonia production reactor and denitration reaction system, denitration reaction system includes along ammonia injection grid and the denitration catalyst that the flue gas flow direction set gradually, and urea hydrolysis ammonia production reactor passes through ammonia cigarette blender and ammonia injection grid intercommunication, and urea solution dissolving tank and urea solution holding vessel outside cladding have the heat preservation cotton respectively all around, have arranged flue gas heat transfer coil and electric tracing band in the heat preservation cotton, and the entry of flue gas heat transfer coil is connected with the export of the high temperature flue gas heat transfer coil of urea hydrolysis ammonia production reactor bottom.
2. The energy-saving urea hydrolysis ammonia production denitration device based on gas turbine SCR denitration of claim 1, wherein the urea solution preparation system comprises a urea storage bin, a urea solution dissolving tank, a urea solution feeding pump, a urea solution storage tank, a metering distribution tank and a hydrolysis catalyst storage tank, the urea storage bin, the urea solution dissolving tank and the urea solution storage tank are sequentially communicated, the urea solution feeding pump is arranged on a pipeline between the urea solution dissolving tank and the urea solution storage tank, and the urea solution storage tank and the hydrolysis catalyst storage tank are respectively communicated with the metering distribution tank and then communicated with the urea hydrolysis ammonia production reactor.
3. The energy-saving urea hydrolysis ammonia production denitration device based on combustion engine SCR denitration of claim 1, wherein a first ammonia-smoke mixer is arranged at an outlet of the urea hydrolysis ammonia production reactor, the first ammonia-smoke mixer is communicated with a second ammonia-smoke mixer along a flow direction of flue gas and then communicated with an ammonia injection grid, the denitration reaction system is communicated with the first ammonia-smoke mixer through a first high-temperature fan, the second ammonia-smoke mixer is communicated with a second high-temperature fan, and the second high-temperature fan is communicated with the denitration reaction system.
4. The energy-saving urea hydrolysis ammonia production denitration device based on gas turbine SCR denitration of claim 1 or 3, characterized in that, the denitration reaction system comprises a waste heat boiler, and a guide plate, an ammonia injection grid and a denitration catalyst which are arranged in the waste heat boiler in sequence along the flue gas flow direction, and the urea hydrolysis ammonia production reactor is arranged adjacent to the waste heat boiler.
5. The energy-saving urea hydrolysis ammonia production denitration device based on gas turbine SCR denitration of claim 4, wherein the exhaust-heat boiler is connected with a high-temperature flue gas heat exchange coil at the bottom of the urea hydrolysis ammonia production reactor through a third high-temperature fan, and a gas-liquid two-phase equilibrium system in the urea hydrolysis ammonia production reactor has a pressure of 0.48-0.6 MPa and a temperature of 130-150 ℃.
6. The energy-saving type ammonia denitration device by urea hydrolysis based on combustion engine SCR denitration of claim 1, wherein the thickness of the heat insulation cotton is not more than 15 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115715928A (en) * | 2022-11-18 | 2023-02-28 | 江苏华南新能源科技有限公司 | Denitration equipment for gas turbine waste heat boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115715928A (en) * | 2022-11-18 | 2023-02-28 | 江苏华南新能源科技有限公司 | Denitration equipment for gas turbine waste heat boiler |
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