CN210934456U - Energy-efficient denitration reductant gasification system - Google Patents
Energy-efficient denitration reductant gasification system Download PDFInfo
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- CN210934456U CN210934456U CN201920947556.XU CN201920947556U CN210934456U CN 210934456 U CN210934456 U CN 210934456U CN 201920947556 U CN201920947556 U CN 201920947556U CN 210934456 U CN210934456 U CN 210934456U
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Abstract
The utility model discloses a high-efficient energy-conserving denitration reductant gasification system, this system includes: an ammonia water preparation unit; an ammonia water storage unit connected to the ammonia water preparation unit; the ammonia water flash distillation unit, it connects in ammonia water storage unit, the output of ammonia water flash distillation unit is connected in power plant deNOx systems. Be applied to power plant's deNOx systems with this system, because energy-efficient denitration reductant gasification system has aqueous ammonia flash distillation unit, can be high-efficient, quick carry out the flash distillation to low concentration aqueous ammonia and let aqueous ammonia concentration promote to 50% to improve the efficiency of denitration, reduce the life-span influence to catalyst in the denitration device. For the original power plant adopting liquid ammonia vaporization, the technology can use the lowest investment to reform the ammonia area, replace class B hazard sources such as a liquid ammonia tank and the like, and eliminate the hidden danger of combustion and explosion.
Description
Technical Field
The utility model belongs to the technical field of the denitration technique of power plant and specifically relates to a high-efficient energy-saving denitration reductant gasification system is related to.
Background
The haze of China is very serious, the government places great importance on ecological environment protection, and the beautiful home with sky blue, earth green and water purification is a dream of each Chinese.
The pollution of the thermal power industry in China to the atmosphere is the first place, and the current thermal power plant enforces an ultra-clean discharge policy of desulfurization, denitrification and dust removal, so that the atmospheric pollution is reduced, and the environment is improved.
At present, most of denitration processes of thermal power plants in China adopt a catalytic reduction (SCR) method with ammonia as a reducing agent, and several methods of an ammonia gas manufacturing system comprise the following steps:
1. a water bath method: and heating liquid ammonia by using medium-temperature water to generate gas ammonia. The method has low evaporation efficiency and large gasification equipment volume.
2. An ammonia water method: the ammonia water directly sprays into the flue, a large amount of water also enters the flue to be evaporated, the energy consumption is large, and the service life of the catalyst is shortened.
3. The urea method comprises the following steps: the hydrolysis or pyrolysis of urea to produce liquid ammonia or ammonia gas, however, has high energy consumption and high operation cost.
In order to further enhance the supervision and management of electric power safety production and continuously promote the comprehensive safety management of dangerous chemicals in the electric power industry, the national energy agency issues an emergency notice (hereinafter referred to as notice) for practically enhancing the comprehensive safety management work of dangerous chemicals in the electric power industry on a near day basis, so that the active development of the management of major dangerous sources in a liquid ammonia tank area is required, and the promotion of the progress of urea replacement, upgrading and reconstruction is accelerated.
Although urea replaces no great dangerous source of a liquid ammonia tank area after upgrading and transformation, the ammonia water with low concentration has the following disadvantages for the denitration work of a power plant:
1. because the ammonia water concentration is low (20% ammonia water), the denitration efficiency is low;
2. the low-concentration ammonia water also contains a large amount of water, so that the service life of the catalyst is reduced along with the reduction of the service life of the catalyst;
3. the ammonia water with low concentration contains a large amount of water, and a large amount of heat is easily taken away in vaporization of the ammonia water, so that the integral energy consumption of the denitration process is high, and the operation cost is high.
From the current situation of supply of denitration reducing agent in the existing power plant, the reducing agent is mainly from (1) liquid ammonia (2) urea (3) ammonia water, wherein the problem that the liquid ammonia exists mainly lies in: according to 'identification of major hazard sources of hazardous chemicals', the critical amount of liquid ammonia storage is as follows: 10 t. More than 10t is a significant source of danger. And liquid ammonia is adopted, so that the safety is low and a safety interval is required. The problems with urea are mainly: (1) the raw material cost is high, and the operation cost is high; (2) the dissolution and the storage are inconvenient, the energy consumption is large, and a large amount of heat sources are needed; (3) the labor intensity is high, and the field condition is poor; (4) large occupied area and high investment; (5) the water sprayed into the boiler and the catalyst is more than (6), and the pipe is easy to block, thus causing shutdown maintenance. The main problems of ammonia are: (1) because the ammonia water concentration is low (about 20%), a large amount of heat energy is taken away in the operation. (2) Easily cause catalyst poisoning and reduce the service life of the catalyst.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an energy-efficient denitration reductant gasification system, it can avoid power plant dangerous explosive sources such as liquid ammonia tank to appear, can not influence the life of denitration equipment catalyst when improving denitration efficiency.
In order to solve the technical problem, the utility model provides an energy-efficient denitration reductant gasification system, it includes: the ammonia water preparation unit (10) comprises an ammonia water preparation device (100), wherein the ammonia water preparation device is provided with an ammonia source inlet and an outlet, and the outlet is sequentially provided with an ammonia water circulating pump (102) and an ammonia water cooling device (101); the ammonia water storage unit comprises an ammonia water storage tank (200), and the input end of the ammonia water storage tank is connected with the output end of the ammonia water cooling device; aqueous ammonia flash distillation unit (30), it includes first aqueous ammonia delivery pump (301a), first flash heater (302a), first flash tank (303a), the input of first aqueous ammonia delivery pump (301a) connect in the output of aqueous ammonia storage tank (200), the output of first aqueous ammonia delivery pump (301a) connect in first flash heater (302a), first flash heater connect in first flash tank (303a), the aqueous ammonia gas output of first flash tank connect in aqueous ammonia buffer tank (304), the output of aqueous ammonia buffer tank (304) is connected in the aqueous ammonia user end.
Compared with the prior art, the high-efficiency energy-saving denitration reducing agent gasification system provided by the utility model can eliminate major burning and explosion sources, and for enterprises such as power plants, the ammonia tanks and other major burning and explosion sources are not needed to be arranged in the plant, so that the safety is effectively improved; the energy consumption of a denitration system of a power plant can be reduced, the proportion of water is reduced while the ammonia gas with the concentration of 50% is provided by the flash evaporation system, a large amount of water can be prevented from entering a hearth and carrying a large amount of heat to be discharged out of equipment, and the problem that the service life of a catalyst in the hearth is shortened too fast due to the large amount of water can be avoided while the proportion of water is reduced; the whole system has good social benefit, and the ammonia area of the power plant in China is transformed to replace a liquid ammonia tank, so that the safety of the operation of the plant area can be effectively improved; the operation cost of the system is low, the operation burden can not be brought to enterprises, the construction cost of the system is low, the enterprises can use the system more economically, and the modification cost is more reasonable.
The utility model discloses an energy-efficient denitration reductant gasification system still includes: a second ammonia water delivery pump (301b), a second flash heater (302b), and a second flash tank (303 b);
the input of second ammonia delivery pump (301b) connect in the aqueous ammonia exit linkage of first flash tank (303a) in second flash heater (302b), the output of second flash heater (302b) is connected second flash tank (303b), the ammonia output of second flash tank (303b) connect in aqueous ammonia buffer tank (304), the aqueous ammonia delivery outlet of second flash tank (303b) is connected in aqueous ammonia cooler (305).
The utility model discloses an energy-efficient denitration reductant gasification system still includes: weak aqua ammonia recovery system, weak aqua ammonia recovery system includes: the dilute ammonia water storage tank (201), the output of dilute ammonia water storage tank (201) is connected in the aqueous ammonia preparation ware, the input of dilute ammonia water storage tank (201) is connected in aqueous ammonia cooler (305).
The utility model discloses an among the energy-efficient denitration reductant gasification system, rare aqueous ammonia recovery system still includes: the ammonia gas generator comprises a desalted water diluting tank (202), wherein the output end of the desalted water diluting tank (202) is connected to a dilute ammonia water storage tank (201), and the input end (202a) of the desalted water diluting tank (202) is connected to an ammonia water preparation device, an ammonia water storage tank and an ammonia water flash system safety valve to diffuse an ammonia gas end.
The utility model discloses an among the energy-efficient denitration reductant gasification system, the input of aqueous ammonia buffer tank (304) is connected with pipeline over heater (305').
The utility model discloses an among the energy-efficient denitration reductant gasification system, the ammonia source access connection of aqueous ammonia preparation ware (100) has unloading oil filling riser (40).
The utility model discloses an among the energy-efficient denitration reductant gasification system, the ammonia source of ammonia source import adopts liquid ammonia tank wagon (50) to carry.
The utility model discloses an among the energy-efficient denitration reductant gasification system, aqueous ammonia storage tank (200) have second ammonia source input interface, second ammonia source input interface connects in manufacturer's aqueous ammonia supply pipe.
The utility model discloses an among the energy-efficient denitration reductant gasification system, aqueous ammonia cooling device includes but not only is limited to the aqueous ammonia cooler.
An application of a high-efficiency energy-saving denitration reducing agent gasification system is applied to a power plant denitration system, and the high-efficiency energy-saving denitration reducing agent gasification system is provided with an ammonia water flash evaporation unit.
The utility model discloses utilize liquid ammonia tank wagon transportation raw materials, the online preparation aqueous ammonia adopts 20% aqueous ammonia storage, and during the use, the aqueous ammonia flash distillation is concentrated, spouts the ammonia of concentration 50% to furnace.
Compare through table 1, table 2 below the utility model discloses and prior art between advantage:
table 1 disadvantages of the prior art
TABLE 2 advantages of the utility model
The utility model discloses following beneficial effect has:
(1) can ensure that dangerous explosion sources such as ammonia tanks do not appear in the power plant and improve the production safety of the power plant.
(2) Can be high-efficient, quick carry out the flash distillation to low concentration aqueous ammonia and let aqueous ammonia concentration promote to 50% to improve the efficiency of denitration, reduce the life-span influence to catalyst in the denitration device.
Utilize the utility model discloses can solve following problem: 1. liquid ammonia transportation, but liquid ammonia storage is not needed, so that a major hazard source is eliminated, the transportation amount of raw materials is small, and the cost is low; 2. the ammonia water is stored, and the device is anti-freezing, does not accompany heat and is not blocked; 3. The energy consumption is low, and the energy consumption of urea hydrolysis and pyrolysis is much higher than that of the method; 4. the moisture entering the catalyst is less, only 1/2 moisture of the urea method is used, the influence on the flue is small, and the influence on the environment is small; the occupied area is smaller than that of urea hydrolysis and pyrolysis; 5. compared with liquid ammonia, the device has no safety distance requirement, is easy to arrange and reduces safety evaluation; 6. the working environment is improved, the automation degree is high, and the labor intensity of operators is low; 7. 100 percent of recycling, zero pollution discharge and realization of no waste ammonia gas, waste water and waste residue discharge in the whole process; 8. the pipeline can not be blocked by the crystal, and the operation is more stable.
Drawings
Fig. 1 is a schematic diagram of an efficient and energy-saving denitration reducing agent gasification system in an embodiment of the present invention.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention will be further described with reference to the following embodiments.
Example 1: enterprises such as power plants and the like generally need to arrange an ammonia tank as a supply of a denitration reducing agent of the power plant, but with the development of the society, the ammonia tank is used as a second type of dangerous explosion source, and is extremely destructive to a plant area after explosion occurs, and how to eliminate the dangerous explosion source such as the ammonia tank of the plant area of the power plant is a development direction vigorously advocated by the nation.
An embodiment of the utility model provides an energy-efficient denitration reductant gasification system, this system can avoid installing this kind of explosion source of ammonia gas jar at factory areas such as power plant, specifically says, see fig. 1, and this system includes: the ammonia water preparation unit 10, the ammonia water storage unit belonging to a non-explosive source, and the ammonia water flash evaporation unit for rapidly increasing low-concentration (for example, 20% concentration ammonia water) ammonia water to high-concentration (for example, 50% concentration ammonia water), it should be noted that 50% concentration ammonia gas is output by the ammonia water flash evaporation unit.
In fig. 1, the ammonia water preparation unit 10 includes an ammonia water preparation device 100, the ammonia water preparation device is provided with an ammonia source inlet (provided with a control valve) and an output port, the ammonia source inlet of the ammonia water preparation device 100 is connected with an unloading crane pipe 40, the ammonia source of the ammonia source inlet adopts a liquid ammonia tank wagon 50 for transportation, and an ammonia water circulating pump 102 and an ammonia water cooling device 101 are sequentially installed at the output port of the ammonia water preparation device 100. The ammonia water preparation unit prepares the liquid ammonia conveyed by the liquid ammonia tank car into 20% ammonia water, wherein the ammonia water with the concentration of less than 25% (e.g. penta-type dangerous source) does not appear as an explosion source any more, the storage is safer, and an explosion-proof isolation area is not required to be established.
The ammonia water preparation ware is the equipment in order to realize liquid ammonia preparation aqueous ammonia, and this ammonia water preparation ware adopts the mode of scaling mixing to prepare the aqueous ammonia, and the aqueous ammonia preparation reaction principle: NH (NH)3+H2O＝NH3·H2O。
Liquid ammonia and desalinized water carry out the preparation aqueous ammonia fast through the liquid drop collision in the aqueous ammonia preparation ware, and liquid ammonia and water mixing process are exothermic reaction, and the heat that the reaction was emitted is greater than the gasification latent heat of liquid ammonia gasification, therefore, the temperature rise in the aqueous ammonia preparation ware, gasify part liquid ammonia, are designed with high-efficient regular packing in the aqueous ammonia preparation ware, and the ammonia that does not absorb after the gasification is absorbed through the mode of countercurrent mass transfer absorption with water and is made the aqueous ammonia.
With continued reference to fig. 1, the ammonia storage unit includes one or more ammonia tanks 200, and here, an ammonia tank 200 is taken as an example, an input end of the ammonia tank is connected to an output end of the ammonia cooling device, and a control valve is installed on an output pipeline of the ammonia tank. The ammonia water storage tank is used for storing 20% ammonia water, and the raw materials do not have explosion property, so that the dangerous source of installing an ammonia gas tank in a factory can be replaced.
In fig. 1, the ammonia water flash evaporation unit 30 includes a first ammonia water delivery pump 301a, a first flash evaporation heater 302a, a first flash evaporation tank 303a, an input end of the first ammonia water delivery pump 301a is connected to an output end of the ammonia water storage tank 200, an output end of the first ammonia water delivery pump 301a is connected to the first flash evaporation heater 302a, the first flash evaporation heater is connected to the first flash evaporation tank 303a, an ammonia water gas output end of the first flash evaporation tank is connected to the ammonia water gas buffer tank 304, and an output end of the ammonia water gas buffer tank 304 is connected to an ammonia water gas using end. The ammonia water flash evaporation unit quickly promotes low-concentration ammonia water to high-concentration gasified ammonia water, so that the ammonia water is directly conveyed to an ammonia gas material end.
From the above, the high-efficiency energy-saving denitration reducing agent gasification system provided by the utility model can eliminate major fuel and explosion sources, for enterprises such as power plants, the ammonia tanks and other major fuel and explosion sources are not needed to be arranged in the plant, and the safety is effectively improved; the energy consumption of a denitration system of a power plant can be reduced, the proportion of water is reduced while the ammonia gas with the concentration of 50% is provided by the flash evaporation system, a large amount of water can be prevented from entering a hearth and carrying a large amount of heat to be discharged out of equipment, and the problem that the service life of a catalyst in the hearth is shortened too fast due to the large amount of water can be avoided while the proportion of water is reduced; the whole system has good social benefit, and the ammonia area of the power plant in China is transformed to replace a liquid ammonia tank, so that the safety of the operation of the plant area can be effectively improved; the system has the advantages that the operation cost is low, the operation burden can not be brought to enterprises, the construction cost is low, the enterprises can use more economically, the modification cost is more reasonable, and the system is particularly suitable for modification of the original ammonia area of the power plant.
It is worth mentioning, the utility model discloses an energy-efficient denitration reductant gasification system adopts two-stage flash evaporation structure, so this system still includes second ammonia delivery pump 301b, second flash heater 302b, second flash tank 303b, second ammonia delivery pump 301 b's input connect in first flash tank 303 a's aqueous ammonia exit linkage in second flash heater 302b, second flash heater 302 b's output is connected second flash tank 303b, second flash tank 303 b's ammonia output connect in aqueous ammonia buffer tank 304, the aqueous ammonia delivery outlet of second flash tank 303b connects in aqueous ammonia cooler 305. This partial structure can carry out the secondary flash distillation to the aqueous ammonia of first flash tank, can give the higher efficient feed for deNOx systems.
In addition, energy-efficient denitration reductant gasification still includes weak aqua ammonia recovery system, weak aqua ammonia recovery system includes weak aqua ammonia storage tank 201, the output of weak aqua ammonia storage tank 201 is connected in the aqueous ammonia preparation ware, the input of weak aqua ammonia storage tank 201 is connected in aqueous ammonia cooler 305.
Of course, the dilute ammonia water recovery system may further include a desalted water dilution tank 202, an output end of the desalted water dilution tank 202 is connected to the dilute ammonia water storage tank 201, and an input end 202a of the desalted water dilution tank 202 is connected to the ammonia water preparation device, the ammonia water storage tank, and the ammonia gas end diffused by the ammonia water flash system safety valve. The desalted water dilution tank provides desalted water for ammonia water preparation, and absorbs ammonia gas released by the ammonia water preparation device and the ammonia water metering tank, so that whole-process closed operation is realized, and no waste gas or waste water is discharged. The dilute ammonia storage tank 201 is intended to store the solution after the flash evaporation in the second flash tank (second flash tank 303b), and to deliver the solution to the ammonia preparation device.
It should be noted that the material of the dilute ammonia storage tank 201 is, for example, SS304, and the material of the flash tank of the two-stage flash system can also be considered as SS 304.
As can be seen from fig. 1, the input end of the ammonia water buffer tank 304 is connected with a pipeline superheater 305' for stabilizing the output.
The steam inlets P of the first flash heater 302a and the second flash heater 302b are shown in fig. 1. The piping of each steam inlet is fitted with control valves, it being noted that six are shown in fig. 1 and five are shown in fig. 1.
It should be noted that the ammonia water storage tank 200 has a second ammonia source input interface, and the second ammonia source input interface is connected to an ammonia water supply pipeline of a manufacturer. Therefore, the ammonia source can be transported by using the tank car, and the ammonia source can be directly supplied to the ammonia storage tank by an ammonia water production enterprise near a power plant through a pipeline.
The utility model discloses an aqueous ammonia preparation ware, it has following advantage: the ammonia water can be rapidly prepared on line, the concentration of the prepared ammonia water is stable, and a liquid ammonia tank car can be prepared within 2-3 hours; basically no leakage point and low failure rate, and the operation is safe and stable; no waste ammonia gas is discharged in the ammonia water preparation process, and the ammonia gas is completely utilized; the equipment has small volume, can be arranged in a prying way and occupies small area; liquid ammonia does not need to be stored, and the liquid ammonia can be unloaded to directly prepare ammonia water; the ammonia water preparation device is normal pressure equipment and does not need an explosion-proof isolation area.
The utility model discloses be applied to the denitration system of power plant with energy-efficient denitration reductant gasification system, can avoid the problem that the explosion source appears in the power plant factory, can be very effective to the transformation of original ammonia district major hazard, accord with the requirement of eliminating as early as possible major hazard of energy bureau regulation.
The utility model discloses as follows with prior art's contrast conclusion:
1. compared with liquid ammonia gasification, a great danger source is eliminated.
2. The process is simple and reliable, the working environment is good, the automation degree is high, and the labor intensity is low.
3. The amount of water sprayed into the catalyst was reduced by 50% compared to urea hydrolysis and pyrolysis.
4. Compared with urea hydrolysis and pyrolysis, the method saves a large amount of cost in three aspects of raw material consumption, energy consumption and investment every year, and saves about 1000 ten thousand yuan for a 600mw power plant.
The utility model discloses an area equallyd divide into the triplex:
1. ammonia water skid with length × mm and width 7000mm × 5400mm
The occupied area is about: 38m2
2. Ammonia water flash sled with length × width 8000mm × 7500mm
The occupied area is about: 60m2
3. Can be modified by using an original ammonia area.
The ammonia water preparation unit 10 (ammonia water preparation sled), the ammonia water flash distillation unit 30 (ammonia water flash distillation sled), sled dress integral structure, equipment performance stability is good, and installation, transportation are simple and convenient, and the site operation time is short. All equipment, instruments, valves and pipelines in the ammonia water preparation system are integrated into a pry according to a production process flow chart, the pry is installed on a chassis of the equipment, the whole ammonia water preparation system is transported to the site, and a user only needs to connect an inlet and an outlet of the equipment during installation. The design and construction are simple, and the construction period is short.
In the embodiment, ammonia water is selected as a denitration reducing agent of a power plant, the denitration reducing agent is stored safely at the concentration of about 20%, and when the denitration reducing agent is used, the denitration reducing agent is concentrated to more than 50% through secondary flash evaporation and is sprayed into a flue, and the water content is half less than that of a urea method. The liquid ammonia unloading is adopted to directly prepare the ammonia water and store the ammonia water, so that the problem of a great hazard source of the liquid ammonia storage tank is solved. The ammonia water is concentrated by adopting a flash evaporation and concentration mode of the ammonia water, and the concentration of the ammonia can be increased to 50 wt%. And the gas after flash evaporation is used for a denitration process, and the diluted ammonia water after flash evaporation returns to the front-end ammonia water preparation system for recycling to prepare ammonia water.
Example 2: the difference from embodiment 1 is that, in order to ensure continuous and normal operation of the denitration ammonia supply system of the power plant, the adjusting valve, the flow meter and the pump in the ammonia water preparation, the ammonia water storage and the ammonia water flash evaporation system in this embodiment are all designed to be used and used, for example, the adjusting valve, the flow meter and the pump are arranged at the output end of the ammonia water preparation device 100.
In consideration of the safety of the system, the ammonia water preparation device 100 and the ammonia water storage tank 200 are respectively provided with a safety diffusing device, the primary flash tank 303a, the secondary flash tank 303b and the ammonia buffer tank 304 are respectively provided with a safety valve, and diffused ammonia gas enters the desalted water dilution tank 202 for secondary absorption, so that the ammonia water preparation and the ammonia water storage are realized without waste ammonia gas and waste water discharge, and zero emission is realized.
After liquid ammonia is conveyed to a factory through a tank car, a liquid ammonia unloading crane pipe directly conveys the liquid ammonia to an ammonia water preparation device to be mixed with desalted water according to a certain proportion, ammonia water with a certain concentration is rapidly prepared, the ammonia water in the ammonia water preparation device is output through an ammonia water pump, and after being cooled by an ammonia water cooler, a part of the ammonia water flows back to the ammonia water preparation device to be subjected to secondary absorption, and a part of the ammonia water enters an ammonia water storage tank to be stored.
The ammonia water densimeter is used for detecting, and the desalted water amount and the reflux amount can be adjusted according to the detection result, so that the ammonia water discharge is maintained within the required concentration range.
The ammonia water is heated by the ammonia water delivery pump and the primary flash heater and then is introduced into the primary flash tank, and the liquid after flash evaporation is delivered by the primary flash pump and heated by the secondary flash heater and then is introduced into the secondary flash tank. And mixing the ammonia gas flashed by the secondary flash tank with the ammonia gas flashed by the primary flash tank, and then feeding the mixture into a denitration system for use.
And conveying the solution flashed by the secondary flash tank to a dilute ammonia storage tank by self-pressure. And pumping the diluted ammonia water into an ammonia water preparation device to be used as spray water of the ammonia water preparation device.
And the ammonia gas released by the system completely enters a desalted water diluting tank for reabsorption, and is pumped into a dilute ammonia water tank for storage through a desalted water pump.
It is worth mentioning that the system can also be provided with a control system, a PLC is used as a control core, the PLC controller is installed in a control cabinet, and the control cabinet is in an explosion-proof structure and is installed on a field prying body. All be equipped with automatic valve, teletransmission instrument etc. at the key position of aqueous ammonia preparation, aqueous ammonia storage, aqueous ammonia flash distillation, for example, at the automatic valve of the output pipeline erection joint in PLC of aqueous ammonia preparation ware 100, at the output installation teletransmission manometer of ammonia buffer tank, communication interface is reserved to the switch board, can reach owner's DCS system with the signal teletransmission, remote operation to but key opens and stops, unmanned on duty can be accomplished to the scene, full automatic operation.
The control system consists of a PLC, a liquid crystal true color touch screen, configuration software and electrical elements, displays a process flow chart of the total-station process and measurement values of various parameters on a control cabinet, has an alarm function, realizes report functions of recording, inquiring and the like, and can modify the parameters on the touch screen conveniently.
In conclusion, the utility model is applied to the denitration system of the power plant, because the liquid ammonia tank car is unloaded to directly and rapidly prepare the ammonia water, no liquid ammonia is stored on site, the safety is high, no major hazard source exists, no safety interval requirement exists, and the occupied area is small; the one-time investment cost is low. And also has the following advantages:
(1) compared with urea pyrolysis and urea hydrolysis, the method has the advantages of low energy consumption, low operation cost and no blocking risk.
(2) No safety space and small occupied area.
(3) The ammonia water preparation, the ammonia water storage and the ammonia water flash process have high automation degree and low labor intensity, and unattended operation can be realized.
(4) The whole processes of the ammonia water preparation, the ammonia water storage and the ammonia water flash evaporation are closed operation, no waste ammonia gas and waste water are discharged, and zero emission is realized in a real sense.
(5) The ammonia water is concentrated by adopting an ammonia water flash evaporation concentration mode, the concentration of the ammonia can be improved to 50 percent by weight, and the water amount sprayed into a boiler and a catalyst is reduced by 50 percent compared with that of urea under the condition of the same ammonia supply amount.
It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.
Claims (8)
1. The utility model provides an energy-efficient denitration reductant gasification system which characterized in that, it includes:
the ammonia water preparation unit (10) comprises an ammonia water preparation device (100), wherein the ammonia water preparation device is provided with an ammonia source inlet and an outlet, and the outlet is sequentially provided with an ammonia water circulating pump (102) and an ammonia water cooling device (101);
the ammonia water storage unit comprises an ammonia water storage tank (200), and the input end of the ammonia water storage tank is connected with the output end of the ammonia water cooling device;
aqueous ammonia flash distillation unit (30), it includes first aqueous ammonia delivery pump (301a), first flash heater (302a), first flash tank (303a), the input of first aqueous ammonia delivery pump (301a) connect in the output of aqueous ammonia storage tank (200), the output of first aqueous ammonia delivery pump (301a) connect in first flash heater (302a), first flash heater connect in first flash tank (303a), the aqueous ammonia gas output of first flash tank connects in aqueous ammonia buffer tank (304), and the output of aqueous ammonia buffer tank (304) is connected in the aqueous ammonia user end.
2. The energy-efficient denitration reducing agent gasification system according to claim 1, further comprising: a second ammonia water delivery pump (301b), a second flash heater (302b), and a second flash tank (303 b);
the input of second ammonia delivery pump (301b) connect in the aqueous ammonia exit linkage of first flash tank (303a) in second flash heater (302b), the output of second flash heater (302b) is connected second flash tank (303b), the ammonia output of second flash tank (303b) connect in aqueous ammonia buffer tank (304), the aqueous ammonia delivery outlet of second flash tank (303b) is connected in aqueous ammonia cooler (305).
3. The energy-efficient denitration reducing agent gasification system according to claim 1 or 2, further comprising: weak aqua ammonia recovery system, weak aqua ammonia recovery system includes: the dilute ammonia water storage tank (201), the output of dilute ammonia water storage tank (201) is connected in the aqueous ammonia preparation ware, the input of dilute ammonia water storage tank (201) is connected in aqueous ammonia cooler (305).
4. The efficient and energy-saving denitration reducing agent gasification system according to claim 3, wherein the dilute ammonia water recovery system further comprises: the ammonia gas generator comprises a desalted water diluting tank (202), wherein the output end of the desalted water diluting tank (202) is connected to a dilute ammonia water storage tank (201), and the input end (202a) of the desalted water diluting tank (202) is connected to an ammonia water preparation device, an ammonia water storage tank and an ammonia water flash system safety valve to diffuse an ammonia gas end.
5. The efficient and energy-saving denitration reducing agent gasification system according to claim 1, wherein the input end of the ammonia water gas buffer tank (304) is connected with a pipeline superheater (305').
6. The efficient energy-saving denitration reducing agent gasification system according to claim 1, wherein an ammonia source inlet of the ammonia water preparation device (100) is connected with an unloading crane pipe (40).
7. The efficient and energy-saving denitration reducing agent gasification system according to claim 1, wherein the ammonia source at the ammonia source inlet is delivered by a liquid ammonia tanker (50).
8. The efficient and energy-saving denitration reducing agent gasification system according to claim 1, wherein the ammonia water storage tank (200) is provided with a second ammonia source input interface, and the second ammonia source input interface is connected to an ammonia water supply pipeline of a manufacturer.
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| CN118371107A (en) * | 2024-06-24 | 2024-07-23 | 国能龙源环保有限公司 | Desulfurization and denitrification system and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118371107A (en) * | 2024-06-24 | 2024-07-23 | 国能龙源环保有限公司 | Desulfurization and denitrification system and method thereof |
| CN118371107B (en) * | 2024-06-24 | 2024-09-10 | 国能龙源环保有限公司 | Desulfurization and denitrification system and method thereof |
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