CN210303111U - Ammonia production device of denitration system of power plant - Google Patents
Ammonia production device of denitration system of power plant Download PDFInfo
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- CN210303111U CN210303111U CN201920437560.1U CN201920437560U CN210303111U CN 210303111 U CN210303111 U CN 210303111U CN 201920437560 U CN201920437560 U CN 201920437560U CN 210303111 U CN210303111 U CN 210303111U
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Abstract
The utility model relates to an ammonia production device of a denitration system of a power plant, which comprises a discharge compressor, a liquid ammonia storage tank, a liquid ammonia supply pump, a liquid ammonia evaporation tank, an ammonia buffer tank, a dilution fan, a mixer, a discharge system, a nitrogen purging system and an ammonia leakage detection device; the liquid ammonia storage tank is connected with the liquid ammonia evaporation tank through a liquid ammonia supply pump, the liquid ammonia evaporation tank is connected with the mixer through an ammonia buffer tank, and the dilution fan is connected with the mixer; the discharge compressor is used for inputting liquid ammonia into the liquid ammonia storage tank from the liquid ammonia tank wagon; the liquid ammonia supply pump is used for conveying the liquid ammonia in the liquid ammonia storage tank into the liquid ammonia evaporation tank; the liquid ammonia evaporation tank is used for evaporating liquid ammonia into ammonia gas and conveying the ammonia gas to the ammonia gas buffer tank; the ammonia buffer tank is used for controlling the pressure and flow of ammonia; the mixer is used for evenly mixing the ammonia gas and the dilution air, and sending the mixed gas into a denitration system for flue gas denitration treatment. The utility model discloses can guarantee deNOx systems's safe operation.
Description
Technical Field
The utility model belongs to the technical field of thermal power, especially, relate to a denitration system ammonia plant of power plant device.
Background
The denitration reducing agent of the denitration system of the power plant mainly adopts three ammonia preparation raw materials such as liquid ammonia, urea and ammonia water. Wherein, liquid ammonia is the most widely applied one in the flue gas denitration technology of the thermal power plant. The ammonia district preparation ammonia gas that current power plant liquid ammonia is generally supplied to power plant ammonia by chemical plant (chemical fertilizer plant) through the liquid ammonia pipeline and supplies the deNOx systems to use, in case chemical plant's shut down or supply ammonia system trouble, the liquid ammonia will stop the supply, will cause deNOx systems environmental protection incident, consequently, need improve current ammonia system to guarantee the safe operation of deNOx systems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a denitration system ammonia plant device to solve above-mentioned technical problem.
The utility model provides an ammonia production device of a denitration system of a power plant, which comprises a discharge compressor, a liquid ammonia storage tank, a liquid ammonia supply pump, a liquid ammonia evaporation tank, an ammonia buffer tank, a dilution fan, a mixer, a discharge system, a nitrogen purging system and an ammonia leakage detection device;
the liquid ammonia storage tank is connected with the liquid ammonia evaporation tank through a liquid ammonia supply pump, the liquid ammonia evaporation tank is connected with the mixer through an ammonia buffer tank, and the dilution fan is connected with the mixer;
the discharge compressor is used for inputting liquid ammonia into the liquid ammonia storage tank from the liquid ammonia tank wagon for conveying the liquid ammonia; the liquid ammonia supply pump is used for conveying the liquid ammonia in the liquid ammonia storage tank into the liquid ammonia evaporation tank; the liquid ammonia evaporation tank is used for evaporating liquid ammonia into ammonia gas and conveying the ammonia gas to the ammonia gas buffer tank; the ammonia buffer tank is used for controlling the pressure and flow of ammonia through a pressure control valve and a flow control valve; the mixer is used for uniformly mixing the ammonia gas conveyed by the ammonia gas buffer tank and the dilution air conveyed by the dilution fan, and conveying the mixed gas into a denitration system for flue gas denitration treatment;
the discharge system comprises an ammonia gas dilution tank, a wastewater pool and a wastewater pump, wherein the ammonia gas dilution tank is connected with the liquid ammonia evaporation tank and is used for absorbing ammonia gas emergently discharged by the liquid ammonia evaporation tank and then discharging the ammonia gas to the wastewater pool, and the wastewater pool conveys wastewater in the wastewater pool to a wastewater treatment plant for treatment through the wastewater pump;
the nitrogen purging system comprises a nitrogen purging pipeline matched with the discharge compressor, the liquid ammonia storage tank, the liquid ammonia evaporation tank and the ammonia buffer tank;
the ammonia gas leakage detection device is arranged at the periphery of the liquid ammonia storage tank, the liquid ammonia evaporation tank and the ammonia gas buffer tank.
Further, the liquid ammonia storage jar is installed overflow valve, check valve, emergency shut-off valve and relief valve.
Further, a thermometer, a pressure gauge, a liquid level meter and a high liquid level alarm instrument are further installed on the liquid ammonia storage tank.
Furthermore, the outlet of the liquid ammonia storage tank, the inlet of the liquid ammonia evaporation tank and the inlet of the mixer are provided with cut-off valves.
Furthermore, the ammonia gas dilution tank is a water tank, and water is sprayed from the top of the ammonia gas dilution tank and enters from the side of the ammonia gas dilution tank.
Borrow by above-mentioned scheme, through power plant's deNOx systems ammonia preparation device, when chemical plant can not normally supply liquid ammonia, can guarantee deNOx systems's safe operation through liquid ammonia storage jar and liquid ammonia conveying system continuous supply liquid ammonia.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
FIG. 1 is the utility model discloses denitration system of power plant ammonia plant's schematic structure.
Reference numbers in the figures:
1-a liquid ammonia storage tank; 2-liquid ammonia supply pump; 3-liquid ammonia evaporation tank; 4-a pressure control valve; 5-a flow control valve; 6-dilution fan; 7-a mixer; 8-a shut-off valve; 9-discharge system.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Referring to fig. 1, the embodiment provides an ammonia production device of a denitration system of a power plant, which includes a discharge compressor, a liquid ammonia storage tank 1, a liquid ammonia supply pump 2, a liquid ammonia evaporation tank 3, an ammonia buffer tank, a dilution fan 6, a mixer 7, an exhaust system 9, a nitrogen purging system and an ammonia leakage detection device;
a liquid ammonia storage tank 1 is connected with a liquid ammonia evaporation tank 3 through a liquid ammonia supply pump 2, the liquid ammonia evaporation tank 3 is connected with a mixer 7 through an ammonia buffer tank, and a dilution fan 6 is connected with the mixer 7;
the discharge compressor is used for inputting liquid ammonia into the liquid ammonia storage tank 1 from a liquid ammonia tank car for transporting the liquid ammonia; the liquid ammonia supply pump 2 is used for conveying the liquid ammonia in the liquid ammonia storage tank 1 into the liquid ammonia evaporation tank 3; the liquid ammonia evaporation tank 3 is used for evaporating liquid ammonia into ammonia gas and conveying the ammonia gas to the ammonia gas buffer tank; the ammonia buffer tank is used for controlling the pressure and flow of ammonia through a pressure control valve 4 and a flow control valve 5; the mixer 7 is used for uniformly mixing the ammonia gas conveyed by the ammonia gas buffer tank and the dilution air conveyed by the dilution fan 6, and sending the mixed gas into a denitration system for flue gas denitration treatment;
the discharge system 9 comprises an ammonia gas dilution tank, a wastewater pool and a wastewater pump, wherein the ammonia gas dilution tank is connected with the liquid ammonia evaporation tank and is used for absorbing ammonia gas emergently discharged by the liquid ammonia evaporation tank and then discharging the ammonia gas into the wastewater pool, and the wastewater pool conveys wastewater in the wastewater pool to a wastewater treatment plant for treatment through the wastewater pump;
the nitrogen purging system comprises a nitrogen purging pipeline matched with the discharge compressor, the liquid ammonia storage tank, the liquid ammonia evaporation tank and the ammonia buffer tank;
the ammonia gas leakage detection device is arranged at the periphery of the liquid ammonia storage tank, the liquid ammonia evaporation tank and the ammonia gas buffer tank.
Through this denitration system ammonia plant device of power plant, when chemical plant can not normally supply liquid ammonia, can guarantee denitration system's safe operation through liquid ammonia storage jar and liquid ammonia conveying system continuous supply liquid ammonia.
In the present embodiment, the liquid ammonia storage tank 1 is equipped with an excess flow valve, a check valve, an emergency shut-off valve, and a safety valve.
In this embodiment, the liquid ammonia storage tank 1 is further provided with a thermometer, a pressure gauge, a liquid level gauge and a high liquid level alarm.
In this embodiment, the outlet of the liquid ammonia storage tank 1, the inlet of the liquid ammonia evaporation tank 3, and the inlet of the mixer 7 are provided with shut-off valves 8.
In this embodiment, the ammonia gas dilution tank is a water tank, and the ammonia gas dilution tank is sprayed with water from the tank top and fed with water from the tank side.
The present invention will be described in further detail below.
Through this denitration system ammonia plant system ammonia device of power plant can provide the ammonia and supply denitration reaction to use. The supply of liquid ammonia is transported by the liquid ammonia tank wagon, utilizes the liquid ammonia compressor of unloading to import liquid ammonia in the liquid ammonia holding vessel with the tank wagon, carries the liquid ammonia in the liquid ammonia storage vessel to evaporate for the ammonia in the liquid ammonia evaporation tank with the liquid ammonia supply pump, controls certain pressure and flow through the ammonia buffer tank, then with dilute the air misce bene in the blender, deliver to deNOx systems again. And ammonia gas emergently discharged from the liquid ammonia evaporation tank is discharged into an ammonia gas dilution tank, is discharged into a wastewater tank through water absorption, and is conveyed to a wastewater treatment plant for treatment through a wastewater pump.
(1) Unloading compressor
And the discharge compressor extracts liquid ammonia in the liquid ammonia storage tank, and pushes the liquid ammonia of the tank car into the liquid ammonia storage tank after compression. In this example, 2 discharge compressors were provided, and 1 was used as a backup.
(2) Liquid ammonia storage jar
In this example, 2 additional 60m ammonia zones were installed3The liquid ammonia storage tank can meet the requirement that one unit of a power plant is used for 7-10 days under the condition of 60% load under the accident condition of one storage tank. An overflow valve, a check valve, an emergency shut-off valve and a safety valve are arranged on the liquid ammonia storage tank and used for liquid ammonia leakage protection. The liquid ammonia storage jar still is equipped with thermometer, manometer, level gauge, high liquid level alarm instrument and corresponding changer and sends the denitration control system with the signal, reports to the police when liquid ammonia storage jar interior temperature or pressure are high. An industrial water spraying pipeline and a nozzle are arranged on the periphery of the liquid ammonia storage tank, and when the temperature of the tank body of the liquid ammonia storage tank is overhigh, an automatic water spraying device is started to automatically spray and reduce the temperature of the tank body; when a trace amount of ammonia gas is leaked, the automatic water spraying device can be started to absorb the ammonia gas, control the ammonia gas and prevent pollution. The liquid ammonia storage tank is not provided with a heat insulation or cooling device, and the storage temperature of the liquid ammonia is 50 DEG CConsider. And the liquid ammonia storage tank is arranged indoors in consideration of the anti-freezing and heat-preserving requirements.
(3) Liquid ammonia supply pump
Liquid ammonia enters a liquid ammonia evaporation tank and can be realized by using pressure difference and the gravitational potential energy of the liquid ammonia; liquid ammonia supply pumps may also be used for supply. In order to ensure uninterrupted supply of liquid ammonia, a liquid ammonia supply pump adopts 1 for 1.
(4) Liquid ammonia evaporation tank
The heat required for the vaporization of liquid ammonia is provided by steam. The liquid ammonia evaporation tank is provided with a pressure control valve for controlling the pressure of ammonia gas within a certain range, and when the outlet pressure is too high, the liquid ammonia feeding is cut off. The ammonia gas outlet pipeline is provided with a temperature detector, liquid ammonia is cut off when the temperature is too low, ammonia gas is enabled to reach the ammonia gas buffer tank to maintain proper temperature and pressure, and the liquid ammonia evaporation tank is provided with a safety valve, so that abnormal overhigh pressure of equipment can be prevented. (5) Ammonia buffer tank
The ammonia flow evaporated from the liquid ammonia evaporation tank enters an ammonia buffer tank, is decompressed into a certain pressure through a pressure control valve, and is sent to a denitration system at the boiler side through an ammonia conveying pipeline. The liquid ammonia buffer tank can satisfy and supply stable ammonia for the SCR system. In order to avoid being influenced by the unstable operation of the liquid ammonia evaporation tank, the ammonia buffer tank is provided with a safety valve for protecting equipment.
(6) Ammonia gas dilution tank
The ammonia gas dilution tank is a water tank with a certain volume, the liquid level of the water tank is maintained by an overflow pipeline, and the ammonia gas dilution tank is sprayed by the tank top and is fed by the tank side. The ammonia gas discharged from each discharge part of the ammonia production device is collected by a pipeline and enters from the lower part of the ammonia gas dilution tank, the ammonia gas is dispersed into the water of the ammonia gas dilution tank through the dispersion pipe, and the ammonia gas discharged by the safety valve is absorbed by a large amount of water.
(7) Dilution fan
The ammonia sprayed into the boiler flue is a mixed gas containing about 5% of ammonia after being diluted by air. The selected fan should meet the requirement of removing the maximum NOx in the flue gas, and a certain margin is left. Dilution fans were set at 100% dilution air capacity (one for one and one for each reactor) required.
(8) Discharge system
The ammonia preparation area is provided with a discharge system, so that an ammonia discharge pipeline is a closed system, ammonia wastewater is absorbed by an ammonia gas dilution tank and then discharged to a wastewater tank, and then the ammonia wastewater is pumped to a wastewater treatment plant through a wastewater pump.
(9) Nitrogen purging system
Maintaining the tightness of the ammonia plant to prevent leakage of ammonia gas and mixing of ammonia gas with air to cause an explosion is the most critical safety issue. The discharge compressor, the liquid ammonia storage tank, the ammonia evaporation tank, the ammonia buffer tank and the like of the device are all equipped with nitrogen purging pipelines. Before liquid ammonia is unloaded, strict system tightness inspection and nitrogen purging are respectively carried out on the equipment through a nitrogen purging pipeline, and the danger caused by ammonia leakage and residual air mixing in the system is prevented.
(10) Ammonia gas leakage detection device
An ammonia gas detector is arranged at the periphery of the ammonia making device to detect the leakage of the ammonia gas and display the concentration of the ammonia in the atmosphere. When the detector detects that the ammonia concentration in the atmosphere is too high, an alarm is sent out in a control room of the unit, and an operator takes necessary measures to prevent the abnormal condition of ammonia gas leakage.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (5)
1. An ammonia production device of a denitration system of a power plant is characterized by comprising a discharge compressor, a liquid ammonia storage tank, a liquid ammonia supply pump, a liquid ammonia evaporation tank, an ammonia buffer tank, a dilution fan, a mixer, an exhaust system, a nitrogen purging system and an ammonia leakage detection device;
the liquid ammonia storage tank is connected with the liquid ammonia evaporation tank through the liquid ammonia supply pump, the liquid ammonia evaporation tank is connected with the mixer through the ammonia buffer tank, and the dilution fan is connected with the mixer;
the discharge compressor is used for inputting liquid ammonia into the liquid ammonia storage tank from a liquid ammonia tank wagon for transporting liquid ammonia; the liquid ammonia supply pump is used for conveying the liquid ammonia in the liquid ammonia storage tank into the liquid ammonia evaporation tank; the liquid ammonia evaporation tank is used for evaporating liquid ammonia into ammonia gas and conveying the ammonia gas to the ammonia gas buffer tank; the ammonia buffer tank is used for controlling the pressure and flow of ammonia through a pressure control valve and a flow control valve; the mixer is used for uniformly mixing the ammonia gas conveyed by the ammonia gas buffer tank and the dilution air conveyed by the dilution fan, and sending the mixed gas into a denitration system for flue gas denitration treatment;
the discharge system comprises an ammonia gas dilution tank, a wastewater pool and a wastewater pump, wherein the ammonia gas dilution tank is connected with the liquid ammonia evaporation tank and is used for absorbing ammonia gas emergently discharged by the liquid ammonia evaporation tank and then discharging the ammonia gas to the wastewater pool, and the wastewater pool conveys wastewater in the wastewater pool to a wastewater treatment plant for treatment through the wastewater pump;
the nitrogen purging system comprises a nitrogen purging pipeline matched with the discharge compressor, the liquid ammonia storage tank, the liquid ammonia evaporation tank and the ammonia buffer tank;
the ammonia gas leakage detection device is arranged at the periphery of the liquid ammonia storage tank, the liquid ammonia evaporation tank and the ammonia buffer tank.
2. The power plant denitration system ammonia plant of claim 1, wherein the liquid ammonia storage tank is equipped with an excess flow valve, a check valve, an emergency shut-off valve and a safety valve.
3. The ammonia plant denitration system of claim 2, wherein the liquid ammonia storage tank is further equipped with a thermometer, a pressure gauge, a level gauge and a high level alarm.
4. The ammonia plant denitration system of claim 1, wherein the outlet of the liquid ammonia storage tank, the inlet of the liquid ammonia evaporation tank and the inlet of the mixer are provided with a shut-off valve.
5. The ammonia plant denitration system ammonia plant device of claim 1, wherein the ammonia gas dilution tank is a water tank, and the ammonia gas dilution tank is sprayed with water from the top of the tank and fed with water from the side of the tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920437560.1U CN210303111U (en) | 2019-04-02 | 2019-04-02 | Ammonia production device of denitration system of power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920437560.1U CN210303111U (en) | 2019-04-02 | 2019-04-02 | Ammonia production device of denitration system of power plant |
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| Publication Number | Publication Date |
|---|---|
| CN210303111U true CN210303111U (en) | 2020-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920437560.1U Expired - Fee Related CN210303111U (en) | 2019-04-02 | 2019-04-02 | Ammonia production device of denitration system of power plant |
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| Country | Link |
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| CN (1) | CN210303111U (en) |
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2019
- 2019-04-02 CN CN201920437560.1U patent/CN210303111U/en not_active Expired - Fee Related
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Granted publication date: 20200414 Termination date: 20210402 |