CN210522209U - Device for vaporizing ammonia water by low-temperature flue gas - Google Patents
Device for vaporizing ammonia water by low-temperature flue gas Download PDFInfo
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- CN210522209U CN210522209U CN201920886886.2U CN201920886886U CN210522209U CN 210522209 U CN210522209 U CN 210522209U CN 201920886886 U CN201920886886 U CN 201920886886U CN 210522209 U CN210522209 U CN 210522209U
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Abstract
The utility model relates to a device of low temperature flue gas vaporization aqueous ammonia, include: supply ammonia pump, coil pipe heat exchanger, liquid/gas separator, surge damping valve, ammonia/flue gas blender, high temperature dilution fan, its characterized in that: the tubular heat exchanger is arranged in a front flue of an inlet of the SCR reactor, an ammonia water tank is connected with an inlet of the tubular heat exchanger through an ammonia supply pump and an adjusting valve, an outlet of the tubular heat exchanger is connected with a liquid/gas separator, a gas outlet is arranged at the upper part of the liquid/gas separator, the gas outlet of the liquid/gas separator is connected with an air inlet of an ammonia/flue gas mixer through a pressure stabilizing valve, an air inlet of a high-temperature dilution fan is connected with an outlet flue of the SCR reactor, an air outlet of the high-temperature dilution fan is connected with an air inlet of the ammonia/flue gas mixer, and an air outlet of the ammonia/flue gas. The utility model discloses the device need not provide the heat source and has reduced heat energy consumption, is particularly useful to the nervous enterprise of energy. The utility model discloses have the reduction energy consumption, reduce the investment, reduce equipment operation maintenance cost.
Description
Technical Field
The utility model discloses the technique relates to a device of low temperature flue gas vaporization aqueous ammonia is applicable to Selective Catalytic Reduction (SCR) low temperature denitration technology.
Background
The SCR low-temperature flue gas denitration technology widely applied in China occupies a very large proportion in the flue gas desulfurization market, and occupies a proportion of over 95 percent in the denitration markets of steel, cement and industrial kilns.
The denitration technology represented by SCR low-temperature denitration is mature, the operation is stable, and the denitration efficiency is high. In the past, low-pressure steam heating or electric heating is generally adopted for ammonia water heating, but the energy supply of some enterprises is short, and if the process is adopted, the equipment investment is increased. Therefore, the investment cost and the operation cost are greatly increased, economic burden is brought to enterprises, and hidden danger of power utilization is increased.
Disclosure of Invention
The utility model aims at making up the defects of the prior art and providing a device for vaporizing ammonia water by low-temperature flue gas. The device provided by the utility model have and further improve low temperature denitration application condition, reduce equipment operation maintenance cost when not influencing denitration efficiency. The utility model discloses an increase coil pipe heat exchanger on traditional aqueous ammonia gasification technology, adopt high temperature dilution fan suction flue gas simultaneously, dilute the ammonia with the low temperature flue gas, avoid adding too much messenger's flue gas temperature because of the mixed air in the traditional technology and have obvious decline, reduced the efficiency of boiler. The mixed low-temperature flue gas further improves the vaporization effect of the ammonia water and reduces the explosion risk of the ammonia gas.
The utility model discloses the technical scheme who takes does:
a device for vaporizing ammonia water by low-temperature flue gas comprises: supply ammonia pump, coil pipe heat exchanger, liquid/gas separator, surge damping valve, ammonia/flue gas blender, high temperature dilution fan, its characterized in that: the tubular heat exchanger is arranged in a front flue of an inlet of the SCR reactor, the ammonia water tank is connected with an inlet of the tubular heat exchanger through an ammonia supply pump and a regulating valve, an outlet of the tubular heat exchanger is connected with the liquid/gas separator, a gas outlet is arranged at the upper part of the liquid/gas separator, the gas outlet of the liquid/gas separator is connected with an air inlet of the ammonia/flue gas mixer through a pressure stabilizing valve, an air inlet of the high-temperature dilution fan is connected with an outlet flue of the SCR reactor, an air outlet of the high-temperature dilution fan is connected with an air inlet of the ammonia/flue gas mixer, and an air outlet of the ammonia/flue gas.
The utility model utilizes the smoke in the front flue of the inlet of the SCR reactor to heat and vaporize the ammonia water, the vaporized ammonia gas is subjected to gas-liquid separation through the liquid/gas separator, and the separated ammonia gas is stably delivered to the ammonia/smoke gas mixer within a certain pressure range through the pressure stabilizing valve; the flue gas pressurized and conveyed by the high-temperature dilution fan and ammonia gas are fully mixed in an ammonia/flue gas mixer, and the mixed ammonia/flue gas mixed gas is sprayed into a front flue of the SCR reactor through an ammonia spraying grid and enters the SCR reactor for denitration reaction after being fully mixed with the flue gas.
The coil heat exchanger is made of stainless steel pipelines.
The liquid/gas separator is internally provided with a wire mesh and a coalescence plate, and the shell of the liquid/gas separator and the wire mesh and the coalescence plate inside the shell of the liquid/gas separator are all made of stainless steel materials.
The liquid/gas separator is provided with a safety valve at the top and a discharge valve at the bottom. When the pressure in the tank is high, the safety valve automatically releases the pressure, and the released ammonia gas is recovered to an ammonia gas dilution tank; when the liquid level in the gas-liquid separation tank is higher than a certain liquid level, the discharge valve can be manually opened to discharge the ammonia water to the trench, and the ammonia water is conveyed to the waste ammonia water tank from the trench to be collected.
The function of the ammonia/flue gas mixer is to fully mix the ammonia gas and the diluted flue gas. And (4) extracting the flue gas in the rear flue of the SCR reactor by using a high-temperature dilution fan to mix with the vaporized ammonia gas. An interface for connecting ammonia gas and flue gas is reserved on the ammonia/flue gas mixer and is respectively connected with an ammonia gas pipeline behind the pressure stabilizing valve and a diluted flue gas pipeline at the outlet of the high-temperature dilution fan. The flue gas extraction port is arranged at a proper position behind the SCR reactor, and the temperature of the extraction port is required to be stabilized at about 180 ℃. The flue is provided with a flange interface which is connected with the high-temperature dilution fan.
The utility model discloses the device need not provide the heat source and has reduced heat energy consumption, is particularly useful to the nervous enterprise of energy. The utility model discloses have the reduction energy consumption, reduce the investment, reduce equipment operation maintenance cost.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings.
As shown in fig. 1, the utility model comprises: supply ammonia pump 2, coil pipe heat exchanger 4, liquid/gas separator 5, surge damping valve 6, ammonia/flue gas blender 7, high temperature dilution fan 8, its characterized in that: the tubular heat exchanger 4 is arranged in a front flue of an inlet of the SCR reactor, the ammonia water tank 1 is connected with an inlet of the tubular heat exchanger 4 through an ammonia supply pump 2 and a regulating valve 3, an outlet of the tubular heat exchanger 4 is connected with a liquid/gas separator 5, the upper part of the liquid/gas separator 5 is provided with a gas outlet, the gas outlet of the liquid/gas separator 5 is connected with an air inlet of an ammonia/flue gas mixer 7 through a pressure stabilizing valve 6, an air inlet of a high-temperature dilution fan 8 is connected with the outlet flue of the SCR reactor, an air outlet of the high-temperature dilution fan 8 is connected with the air inlet of the ammonia/flue gas mixer 7, and an air outlet of the ammonia/flue gas mixer. The coil heat exchanger is made of stainless steel pipelines. The liquid/gas separator is internally provided with a wire mesh and a coalescence plate, and the shell of the liquid/gas separator and the wire mesh and the coalescence plate inside the shell of the liquid/gas separator are all made of stainless steel materials.
The utility model heats and vaporizes ammonia water by utilizing smoke in a front flue of an inlet of an SCR reactor, the vaporized ammonia gas is subjected to gas-liquid separation by a liquid/gas separator, and the separated ammonia gas is stably delivered to an ammonia/smoke gas mixer within a certain pressure range by a pressure stabilizing valve; the flue gas pressurized and conveyed by the high-temperature dilution fan and ammonia gas are fully mixed in an ammonia/flue gas mixer, and the mixed ammonia/flue gas mixed gas is sprayed into a front flue of the SCR reactor through an ammonia spraying grid and enters the SCR reactor for denitration reaction after being fully mixed with the flue gas.
The process flow of the utility model is as follows:
the ammonia supply pump 2 sends ammonia water with a certain concentration stored in the ammonia water tank 1 to the pipe-coil heat exchanger 4 to exchange heat with the smoke generator, the heat of the smoke is utilized to heat the ammonia water, the heated and vaporized ammonia water enters the liquid/gas separator, gas-liquid separation is carried out in the liquid/gas separator, when ammonia passes through the wire mesh and the coalescence plate layer of the liquid/gas separator, fine fog drops carried by the ammonia are blocked, the ammonia gas passing through the wire mesh and the coalescence plate layer is led out from the upper outlet of the liquid/gas separator and enters an ammonia/flue gas mixer 7, diluting and fully mixing the mixed ammonia gas with the flue gas sent by a high-temperature dilution fan 8 in an ammonia/flue gas mixer 7, wherein the ammonia content in the diluted flue gas is less than or equal to 5 percent, the mixed ammonia gas is uniformly sprayed into a flue in front of an SCR reactor through an ammonia spraying grid, the NOx is removed by the quick reaction of the SCR low-temperature catalyst and the NOx in the flue gas after being uniformly mixed with the flue gas in the flue.
The utility model discloses in not having the equipment structure of specific description, be existing equipment, directly purchase on the market.
Example 1
The flue gas denitration and denitration process of the sintering machine adopts a traditional SCR low-temperature denitration process, the flue gas amount is 27 ten thousand standard square, and the content of inlet NOx is 300-600 mg/Nm3The content of outlet NOx is less than 100mg/Nm3. A low-temperature flue gas ammonia water vaporization device is adopted in the traditional low-temperature denitration process.
And (2) conveying ammonia water with the concentration of 20% stored in an ammonia water tank to a pipe disc heat exchanger by an ammonia supply pump, wherein the pipe disc heat exchanger is arranged at a place with the smoke temperature of 200 ℃ at an SCR denitration inlet, the ammonia water is heated and vaporized by utilizing the heat of smoke, the ammonia water is heated to 120-150 ℃, the heated ammonia/water vapor mixture enters a liquid/gas separator, gas-liquid separation is carried out in the liquid/gas separator, and fine fog drops carried by the ammonia gas passing through the liquid/gas separator are blocked. The ammonia gas after gas-liquid separation is diluted and fully mixed with the smoke gas sucked by the high-temperature dilution fan in the ammonia/smoke gas mixer, the mixed smoke gas is uniformly sprayed into a flue in front of the SCR reactor through an ammonia spraying grid, and the mixed smoke gas is uniformly mixed with the smoke gas in the flue and then rapidly reacts with NOx in the smoke gas through an SCR low-temperature catalyst to achieve the aim of removing NOx.
Claims (4)
1. A device for vaporizing ammonia water by low-temperature flue gas comprises: supply ammonia pump, coil pipe heat exchanger, liquid/gas separator, surge damping valve, ammonia/flue gas blender, high temperature dilution fan, its characterized in that: the tubular heat exchanger is arranged in a front flue of an inlet of the SCR reactor, an ammonia water tank is connected with an inlet of the tubular heat exchanger through an ammonia supply pump and an adjusting valve, an outlet of the tubular heat exchanger is connected with a liquid/gas separator, a gas outlet is arranged at the upper part of the liquid/gas separator, the gas outlet of the liquid/gas separator is connected with an air inlet of an ammonia/flue gas mixer through a pressure stabilizing valve, an air inlet of a high-temperature dilution fan is connected with an outlet flue of the SCR reactor, an air outlet of the high-temperature dilution fan is connected with an air inlet of the ammonia/flue gas mixer, and an air outlet of the ammonia/flue gas.
2. The device for vaporizing ammonia water by using low-temperature flue gas as claimed in claim 1, wherein: the coil heat exchanger is made of stainless steel pipelines.
3. The device for vaporizing ammonia water by using low-temperature flue gas as claimed in claim 1, wherein: the liquid/gas separator is internally provided with a wire mesh and a coalescence plate, and the shell of the liquid/gas separator and the wire mesh and the coalescence plate inside the shell of the liquid/gas separator are all made of stainless steel materials.
4. The device for vaporizing ammonia water by using low-temperature flue gas as claimed in claim 3, wherein: the liquid/gas separator is provided with a safety valve at the top and a discharge valve at the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920886886.2U CN210522209U (en) | 2019-06-13 | 2019-06-13 | Device for vaporizing ammonia water by low-temperature flue gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920886886.2U CN210522209U (en) | 2019-06-13 | 2019-06-13 | Device for vaporizing ammonia water by low-temperature flue gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111871194A (en) * | 2020-07-27 | 2020-11-03 | 重庆鲍斯净化设备科技有限公司 | High concentration nitrogen oxide tail gas treatment system |
| CN112090274A (en) * | 2020-09-09 | 2020-12-18 | 西安热工研究院有限公司 | Denitration SCR system reductant moisture is reported to police and discharge system |
| CN114669193A (en) * | 2022-04-07 | 2022-06-28 | 天津中材工程研究中心有限公司 | Reducing agent supply system for low-temperature SCR denitration of cement plant and control method |
-
2019
- 2019-06-13 CN CN201920886886.2U patent/CN210522209U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111871194A (en) * | 2020-07-27 | 2020-11-03 | 重庆鲍斯净化设备科技有限公司 | High concentration nitrogen oxide tail gas treatment system |
| CN112090274A (en) * | 2020-09-09 | 2020-12-18 | 西安热工研究院有限公司 | Denitration SCR system reductant moisture is reported to police and discharge system |
| CN114669193A (en) * | 2022-04-07 | 2022-06-28 | 天津中材工程研究中心有限公司 | Reducing agent supply system for low-temperature SCR denitration of cement plant and control method |
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