CN112426859A - Ammonia water regulating system for SNCR (selective non-catalytic reduction) denitration - Google Patents
Ammonia water regulating system for SNCR (selective non-catalytic reduction) denitration Download PDFInfo
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- CN112426859A CN112426859A CN202011425712.XA CN202011425712A CN112426859A CN 112426859 A CN112426859 A CN 112426859A CN 202011425712 A CN202011425712 A CN 202011425712A CN 112426859 A CN112426859 A CN 112426859A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
- B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
- B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
- B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses an ammonia water regulating system for SNCR (selective non-catalytic reduction) denitration, which comprises an ammonia water tank, a water storage tank, a deionized water tank, a dilution tank, a hydraulic mixer, an atomizing spray gun, a boiler and an air compressor, wherein the water storage tank is arranged above the ammonia water tank; the liquid outlet of ammonia jar and hydraulic mixer's first feed inlet intercommunication, the gas outlet of ammonia jar and the air inlet intercommunication of water storage tank, the liquid outlet of deionized water jar and the liquid outlet of water storage tank all communicate with hydraulic mixer's second feed inlet, hydraulic mixer's first discharge gate and the inlet intercommunication of diluting the jar, the gas outlet of diluting the jar and the air inlet intercommunication of water storage tank, the liquid outlet of diluting the jar and the confession liquid mouth intercommunication of atomizing spray gun, the nozzle of atomizing spray gun and the furnace chamber of boiler intercommunication, the air supply port of atomizing spray gun and air compressor's gas transmission mouth intercommunication. The invention can dilute and mix ammonia water, simultaneously avoids ammonia gas escape, improves the treatment effect and efficiency of denitration, saves cost, and belongs to the technical field of denitration.
Description
Technical Field
The invention relates to the technical field of denitration, in particular to an ammonia water adjusting system for SNCR denitration.
Background
The flue gas generated by the thermal power plant often contains Nitrogen Oxides (NOX) such as NO, NO2, etc., and the flue gas needs to be subjected to denitration treatment before being discharged to the atmosphere through a chimney, and reaches a certain emission standard. The denitration agents commonly used at present comprise liquid ammonia, urea, ammonia water with the mass fraction of 20% (referred to as ammonia water for short) and the like. Ammonia water is the most commonly used denitration agent due to its advantages of high safety, simple preparation, etc. According to the ammonia water denitration principle, ammonia water is conveyed to the position near a boiler furnace chamber through a pipeline by an ammonia water conveying pump to be mixed with dilution water conveyed by a dilution water conveying pump, then the mixture is sprayed into the furnace chamber through a double-fluid atomization spray gun (the temperature is about 850-1100 ℃), under the action of high temperature, NH3 gas is rapidly decomposed by the ammonia water, the ammonia water reacts with NOX in smoke, N2 and H2O are generated, and NOX removal is completed. The prior art needs many devices, pipelines, valves and instruments, in addition, when a plurality of boilers operate at medium and low loads or the content of NOx in smoke is low, the consumption of ammonia water required by SNCR denitration is very small (such as 10kg/h-100kg/h), at the moment, the requirement on an ammonia water pipeline adjusting valve is very high, the precision of a domestic adjusting valve is often difficult to meet accurate adjustment at small flow, the injection quantity of ammonia water is small, NOx can be discharged beyond the standard, the injection quantity of ammonia water is small and large, energy is wasted, ammonia escape exceeds the standard easily, the environment is polluted, and meanwhile, the escaped NH3 reacts with SO3 in the smoke to produce (NH4)2SO4, SO that the air preheater is blocked and the like.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to: the invention provides an ammonia water adjusting system for SNCR denitration, which can dilute and mix ammonia water and simultaneously avoid ammonia gas escape, improve the denitration treatment effect and efficiency and save the cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
an ammonia water regulating system for SNCR denitration comprises an ammonia water tank, a water storage tank, a deionized water tank, a dilution tank, a hydraulic mixer, an atomization spray gun, a boiler and an air compressor; the boiler is provided with a furnace chamber for storing flue gas, the hydraulic mixer is provided with a first feeding hole, a second feeding hole and a first discharging hole, and the atomizing spray gun is provided with a liquid supply port, an atomizing port and a gas supply port;
the liquid outlet of ammonia jar with hydraulic mixer's first feed inlet intercommunication, the gas outlet of ammonia jar with the air inlet intercommunication of water storage tank, the liquid outlet of deionized water jar with the liquid outlet of water storage tank all with hydraulic mixer's second feed inlet intercommunication, hydraulic mixer's first discharge gate with dilute the inlet intercommunication of jar, dilute the jar the gas outlet with the air inlet intercommunication of water storage tank, dilute the jar the liquid outlet with atomizing spray gun's confession liquid mouth intercommunication, atomizing spray gun's nozzle with the furnace chamber intercommunication of boiler, atomizing spray gun's air supply opening with air compressor's gas transmission mouth intercommunication.
Further, the ammonia water regulating system for SNCR denitration also comprises a first conveying pipe; one end of the first conveying pipe is connected to a liquid outlet of the ammonia water tank, the other end of the first conveying pipe is connected to a first material inlet of the hydraulic mixer, and a first manual ball valve, a first pneumatic ball valve and a first flow meter are arranged on the first conveying pipe.
Further, the ammonia water adjusting system for SNCR denitration also comprises a second conveying pipe; one end of the second conveying pipe is connected to a liquid outlet of the deionized water tank, the other end of the second conveying pipe is connected to a second feeding port of the hydraulic mixer, and a second manual ball valve, a second pneumatic ball valve and a second flowmeter are arranged on the second conveying pipe.
Further, install the level gauge on the dilution tank, the level gauge with first pneumatic ball valve signal connection.
Further, the ammonia water regulating system for SNCR denitration further comprises a third conveying pipe, a fourth conveying pipe and a fifth conveying pipe which are sequentially connected; the third conveying pipe is connected to a liquid outlet of the dilution tank, the fifth conveying pipe is connected to a liquid supply opening of the atomization spray gun, and the third conveying pipe is provided with a conveying pump.
Furthermore, a third manual ball valve, a third flow meter, an electric regulating valve and a pressure transmitter are arranged on the fourth conveying pipe.
Further, the ammonia water adjusting system for SNCR denitration also comprises a sixth conveying pipe; be equipped with the manual ball valve of fourth on the sixth conveyer pipe, first side opening and second side opening have on the fourth conveyer pipe, the manual ball valve of third with the third flowmeter and electrical control valve all is located between first side opening and the second side opening, the one end of sixth conveyer pipe is connected the first side opening department of fourth conveyer pipe, the other end of sixth conveyer pipe is connected the second side opening department of fourth conveyer pipe.
Further, a first stop valve and a float flowmeter are arranged on the fifth conveying pipe.
Further, the ammonia water regulating system for SNCR denitration also comprises an air supply pipe; be equipped with fifth manual ball valve and second stop valve and manometer on the air supply pipe, the one end of air supply pipe is connected the air feed mouth department of atomizing spray gun, the other end of air supply pipe is connected air compressor's gas transmission mouth department.
Further, be equipped with first breather valve on the aqueous ammonia jar, be equipped with the second breather valve on the dilution jar.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the ammonia water and the dilution water are firstly diluted and mixed to a certain mass fraction, and then the mixture is conveyed to the furnace cavity of the boiler through the conveying pump, the electric regulating valve is adopted to control the required ammonia water injection amount, the ammonia water and the dilution water are firstly diluted and mixed, the ammonia water conveying amount can be increased, the regulation and control of the regulating valve are convenient, and the problems that the ammonia escape exceeds the standard, equipment and valves are blocked and the like due to the fact that the ammonia water injection amount is small and is difficult to regulate and control in the prior art are solved. Mix in the aqueous ammonia in the dilution jar at aqueous ammonia before the aqueous ammonia delivery pump and dilute easy operation for aqueous ammonia injection volume is controlled easily. The ammonia that ammonia jar and dilution jar overflowed can flow the water storage tank again and make the aqueous ammonia, improves the utilization ratio of aqueous ammonia, practices thrift the cost.
Drawings
FIG. 1 is a schematic connection diagram of an ammonia conditioning system for SNCR denitration.
In the figure, 1 is an ammonia water tank, 2 is a water storage tank, 3 is a deionized water tank, 4 is a dilution tank, 5 is a hydraulic mixer, 6 is an atomizing spray gun, 7 is a boiler, 8 is an air compressor, 9 is a first delivery pipe, 10 is a first manual ball valve, 11 is a first pneumatic ball valve, 12 is a first flow meter, 13 is a second delivery pipe, 14 is a second manual ball valve, 15 is a second pneumatic ball valve, 16 is a second flow meter, 17 is a liquid level meter, 18 is a third delivery pipe, 19 is a fourth delivery pipe, 20 is a fifth delivery pipe, 21 is a delivery pump, 22 is a third manual ball valve, 23 is a third flow meter, 24 is an electric control valve, 25 is a pressure transmitter, 26 is a sixth delivery pipe, 27 is a fourth manual ball valve, 28 is a first stop valve, 29 is a float flow meter, 30 is an air supply pipe, 31 is a fifth manual ball valve, 32 is a second stop valve, 33 is a pressure gauge, 34 is a first breathing valve, 35 is a second breather valve, 36 is a liquid supply pipe, 37 is a liquid supply pump, 38 is an ammonia water vehicle, 39 is a seventh delivery pipe, and 40 is a sixth manual ball valve.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with 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.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For convenience of description, unless otherwise noted, the up-down direction described below coincides with the up-down direction of fig. 1 itself, and the left-right direction described below coincides with the left-right direction of fig. 1 itself.
SNCR is a selective non-catalytic reduction (selective non-catalytic reduction) and is carried out at high temperature, no catalyst is needed, and the cost is low. The selective non-catalytic reduction means that under the action of no catalyst, a reducing agent is sprayed into a temperature window suitable for denitration reaction to reduce nitrogen oxides in the flue gas into harmless nitrogen and water. The technology generally adopts ammonia, urea or hydrogen ammonia acid sprayed in a furnace as a reducing agent to reduce NOx. The reductant reacts only with NOx in the flue gas and generally does not react with oxygen, and this technique does not employ a catalyst, so this method is referred to as selective non-catalytic reduction (SNCR). Since the process does not use a catalyst, the reducing agent must be added in the high temperature zone. The reductant is sprayed into the furnace chamber area and is rapidly thermally decomposed into NH3, which reacts with NOx in the flue gas to form N2 and water.
As shown in fig. 1, the embodiment provides an ammonia water regulation system for SNCR denitration, which includes an ammonia water tank 1, a water storage tank 2, a deionized water tank 3, a dilution tank 4, a hydraulic mixer 5, an atomizing spray gun 6, a boiler 7, and an air compressor 8; the boiler 7 is provided with a furnace chamber for storing flue gas, the hydraulic mixer 5 is provided with a first feeding hole, a second feeding hole and a first discharging hole, and the atomizing spray gun 6 is provided with a liquid supply hole, an atomizing spray hole and a gas supply hole; ammonia tank 1 has the sealed chamber that is used for saving the aqueous ammonia, and ammonia tank 1 is equipped with inlet and liquid outlet and gas outlet, and ammonia tank 1's inlet department is equipped with feed tube 36, installs feed pump 37 on the feed tube 36, and aqueous ammonia car 38 is through feed tube 36 and ammonia tank 1's sealed chamber intercommunication, carries the aqueous ammonia for ammonia tank 1 through aqueous ammonia car 38. The pure water is stored in the water storage tank 2 and used for absorbing the emitted ammonia gas to reform the ammonia water, and the water storage tank 2 is provided with an ammonia gas inlet and an ammonia water outlet. Dilute jar 4 and be used for diluting the aqueous ammonia, dilute jar 4 and have the gas outlet that the ammonia flows out and the liquid outlet that the aqueous ammonia flows out. The deionized water tank 3 stores deionized water.
The liquid outlet of ammonia jar 1 and the first feed inlet intercommunication of hydraulic mixer 5, the gas outlet of ammonia jar 1 and the air inlet intercommunication of water storage tank 2, the liquid outlet of deionized water jar 3 and the liquid outlet of water storage tank 2 all communicate with the second feed inlet of hydraulic mixer 5, the first discharge gate of hydraulic mixer 5 and the inlet intercommunication of dilution tank 4, the gas outlet of dilution tank 4 and the air inlet intercommunication of water storage tank 2, the liquid outlet of dilution tank 4 and the confession liquid mouth intercommunication of spray gun 6, the nozzle of spray gun 6 and the furnace chamber intercommunication of boiler 7, the air supply opening of spray gun 6 and air compressor 8's gas transmission mouth intercommunication. The ammonia gas in the ammonia water tank 1 can be emitted, the ammonia gas emitted by the ammonia water tank 1 flows to the water storage tank 2 from the gas outlet of the ammonia water tank 1 to form the ammonia water again, and the ammonia gas emitted by the dilution tank 4 flows to the water storage tank 2 from the gas outlet of the dilution tank 4 to form the ammonia water again. The ammonia water in the water storage tank 2, the ammonia water in the ammonia water tank 1 and the deionized water in the deionized water tank 3 are mixed by the hydraulic mixer 5 to form a mixed liquid which is sent to the dilution tank 4. And finally, the mixed liquid flows to the atomizing spray gun 6 from the dilution tank 4, and the compressed air has an atomizing effect on the ammonia water and has a cooling effect on the inside of the atomizing spray gun 6. The ammonia water atomized by the atomizing spray gun 6 is sprayed into a hearth of the boiler 7 to perform chemical reaction with NOx in the flue gas, so that the flue gas denitration process is completed.
Specifically, in one embodiment, the temperature of the furnace chamber of the boiler 7 is 850 ℃ to 1100 ℃.
Specifically, in one embodiment, the ammonia water conditioning system for SNCR denitration further includes a first delivery pipe 9; one end of the first delivery pipe 9 is connected with the liquid outlet of the ammonia water tank 1, the other end of the first delivery pipe 9 is connected with the first feed inlet of the hydraulic mixer 5, and the first delivery pipe 9 is provided with a first manual ball valve 10, a first pneumatic ball valve 11 and a first flowmeter 12. The ammonia jar 1 sets gradually along the circulation direction of aqueous ammonia through the first feed inlet of first conveyer pipe 9 with hydraulic mixer 5, first manual ball valve 10 and first pneumatic ball valve 11 and first flowmeter 12, and first manual ball valve 10 and first pneumatic ball valve 11 all are used for controlling the flow of aqueous ammonia, and first flowmeter 12 is used for calculating the flow of aqueous ammonia in real time, the control of the aqueous ammonia flow of being convenient for.
Specifically, in one embodiment, the ammonia water regulation system for SNCR denitration further includes a second delivery pipe 13; one end of a second delivery pipe 13 is connected with the liquid outlet of the deionized water tank 3, the other end of the second delivery pipe 13 is connected with the second feed inlet of the hydraulic mixer 5, and a second manual ball valve 14, a second pneumatic ball valve 15 and a second flow meter 16 are arranged on the second delivery pipe 13. Deionized water flows from the outlet of the ionized water tank through a second delivery pipe 13 to the second inlet of the hydraulic mixer 5. Deionized water and ammonia were mixed in a hydraulic mixer 5. The second manual ball valve 14 and the second pneumatic ball valve 15 are sequentially disposed along the flow direction of the deionized water, and the second flow meter 16 is disposed. The second manual ball valve 14 and the second pneumatic ball valve 15 are used for adjusting the flow of the deionized water, and the second flow meter 16 is used for calculating the flow of the deionized water in real time, so that accurate control is realized.
Specifically, in one embodiment, a seventh delivery pipe 39 is disposed at the liquid outlet of the water storage tank 2, the seventh delivery pipe 39 of the liquid outlet of the water storage tank 2 is communicated with the second feed inlet of the hydraulic mixer 5, and the ammonia gas is saturated by the water storage tank 2 and then discharged to the dilution tank 4. The aqueous ammonia outflow through the sixth manual ball valve 40 control water storage tank 2 the inside, and the aqueous ammonia of water storage tank 2 and the aqueous ammonia of 1 the inside of ammonia jar cooperate each other and provide the aqueous ammonia to hydraulic mixer 5 altogether, guarantees that the aqueous ammonia in hydraulic mixer 5 can not be too much and too little, the dilution concentration of accurate control aqueous ammonia.
Specifically, in one embodiment, the ammonia water flowing into the dilution tank 4 is diluted to dilute ammonia water having a mass fraction of 20%. The ammonia gas emitted from the dilution tank 4 can flow back to the water storage tank 2 to be absorbed and reformed into ammonia water.
Specifically, in one embodiment, a liquid level meter 17 is mounted on the dilution tank 4, and the liquid level meter 17 is in signal connection with the first pneumatic ball valve 11. The level gauge 17 is long-range level gauge 17, and level gauge 17 has upper limit response end and lower limit response, and upper limit response end is through last liquid pipe and the inner chamber intercommunication of dilution tank 4, and lower limit response end is through the inner chamber intercommunication of downcomer and dilution tank 4, and last liquid pipe is located the top of downcomer. When the liquid in the dilution tank 4 is full, the upper limit induction end senses the liquid, and the liquid level meter 17 transmits a signal to the first pneumatic ball valve 11, so that the first pneumatic ball valve 11 is automatically closed. When the liquid in the dilution tank 4 is running low, the lower limit induction end does not induce the liquid, and the liquid level meter 17 transmits a signal to the first pneumatic ball valve 11 to enable the first pneumatic ball valve 11 to be automatically opened.
Specifically, in one embodiment, the ammonia water regulation system for SNCR denitration further includes a third delivery pipe 18, a fourth delivery pipe 19 and a fifth delivery pipe 20 which are connected in sequence; the third delivery pipe 18 is connected with the liquid outlet of the dilution tank 4, the fifth delivery pipe 20 is connected with the liquid supply of the atomizing spray gun 6, and the third delivery pipe 18 is provided with a delivery pump 21. The diluted ammonia water is pumped by a delivery pump 21, flows through a third delivery pipe 18, a fourth delivery pipe 19 and a fifth delivery pipe 20 in sequence, and is sprayed out of the atomizing spray gun 6 to the furnace chamber to react with NOX in the flue gas. The ammonia water is mixed and diluted in the dilution tank 4 before passing through the delivery pump 21, the cost is saved, the operation is simple, and the injection amount of the ammonia water is easy to control.
Specifically, in one embodiment, there are two third delivery pipes 18, two third delivery pipes 18 are spaced up and down, and two third delivery pipes 18 are connected to the fourth delivery pipe 19 and are both provided with delivery pumps 21, so as to improve the delivery efficiency of the ammonia water.
Specifically, in one embodiment, the fourth delivery pipe 19 is provided with a third manual ball valve 22, a third flow meter 23, an electric control valve 24 and a pressure transmitter 25. The third manual ball valve 22, the third flow meter 23, the electric regulator valve 24, and the pressure transmitter 25 are sequentially provided along the flow direction of the ammonia water. The third flow meter 23 controls the ammonia injection amount by controlling the electric control valve 24 according to the detection value of NOx in the flue gas at the outlet of the chimney and the ammonia escape value. The pressure transducer 25 can convert the sensed physical pressure parameter of the fluid into a standard electrical signal for supply to the electrical control valve 24 or to secondary instruments such as an indicator alarm, recorder, regulator, etc. for measurement, indication and process regulation.
Specifically, in one embodiment, the ammonia water conditioning system for SNCR denitration further includes a sixth delivery pipe 26; the sixth delivery pipe 26 is a spare pipe. A fourth manual ball valve 27 is arranged on the sixth delivery pipe 26, the fourth delivery pipe 19 is provided with a first side hole and a second side hole, the third manual ball valve 22, the third flowmeter 23 and the electric regulating valve 24 are positioned between the first side hole and the second side hole, one end of the sixth delivery pipe 26 is connected with the first side hole of the fourth delivery pipe 19, and the other end of the sixth delivery pipe 26 is connected with the second side hole of the fourth delivery pipe 19. When the ammonia water flows only through the fourth delivery pipe 19, the ammonia water sequentially passes through the third manual ball valve 22, the third flow meter 23, the electric control valve 24 and the pressure transmitter 25, and when the ammonia water flows through the sixth delivery pipe 26, the ammonia water sequentially passes through the fourth manual ball valve 27 and the pressure transmitter 25.
Specifically, in one embodiment, the ammonia conditioning system for SNCR denitration further includes a gas supply pipe 30; the air supply pipe 30 is provided with a fifth manual ball valve 31, a second stop valve 32 and a pressure gauge 33, one end of the air supply pipe 30 is connected to the air supply port of the atomizing spray gun 6, and the other end of the air supply pipe 30 is connected to the air delivery port of the air compressor 8. The fifth manual ball valve 31 and the second shutoff valve 32 are sequentially disposed along the flow direction of the ammonia water, and the pressure gauge 33 is communicated with the second shutoff valve 32.
Specifically, in one embodiment, the fifth delivery pipe 20 is provided with a first shut-off valve 28 and a float flow meter 29. The fifth conveying pipe 20 and the atomizing spray guns 6 are multiple in number, the fifth conveying pipes 20 correspond to the atomizing spray guns 6 one by one, the fifth conveying pipes 20 are arranged at intervals, and the atomizing spray guns 6 are arranged at intervals. The number of the gas supply pipes 30 is plural, and the plural gas supply pipes 30 correspond to the plural atomizing spray guns 6 one by one. Each of the fifth transport pipes 20 is provided with a first shut-off valve 28 and a float flow meter 29 for regulating the amount of ammonia water in each of the fifth transport pipes 20 to be substantially equal.
Specifically, in one embodiment, the atomizing spray gun 6 is a two-fluid atomizing spray gun 6, the atomizing spray gun 6 has two air supply ports into which compressed air enters, one end of the air supply pipe 30 is connected to an output end of the air compressor 8, and the other end of the air supply pipe 30 is branched into two branch pipes which are respectively connected to the two air supply ports.
Specifically, in one embodiment, the ammonia water tank 1 is provided with a first breather valve 34, and the dilution tank 4 is provided with a second breather valve 35. The first breather valve 34 keeps the difference between the internal and external pressures of the ammonia tank 1 within an allowable range, preventing the inside of the ammonia tank 1 from generating vacuum. The second breather valve 35 keeps the difference in the internal and external air pressures of the dilution tank 4 within an allowable range, preventing the generation of a vacuum inside the dilution tank 4.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides an aqueous ammonia governing system of SNCR denitration which characterized in that: comprises an ammonia water tank, a water storage tank, a deionized water tank, a dilution tank, a hydraulic mixer, an atomizing spray gun, a boiler and an air compressor; the boiler is provided with a furnace chamber for storing flue gas, the hydraulic mixer is provided with a first feeding hole, a second feeding hole and a first discharging hole, and the atomizing spray gun is provided with a liquid supply port, an atomizing port and a gas supply port;
the liquid outlet of ammonia jar with hydraulic mixer's first feed inlet intercommunication, the gas outlet of ammonia jar with the air inlet intercommunication of water storage tank, the liquid outlet of deionized water jar with the liquid outlet of water storage tank all with hydraulic mixer's second feed inlet intercommunication, hydraulic mixer's first discharge gate with dilute the inlet intercommunication of jar, dilute the jar the gas outlet with the air inlet intercommunication of water storage tank, dilute the jar the liquid outlet with atomizing spray gun's confession liquid mouth intercommunication, atomizing spray gun's nozzle with the furnace chamber intercommunication of boiler, atomizing spray gun's air supply opening with air compressor's gas transmission mouth intercommunication.
2. The ammonia water conditioning system for SNCR denitration of claim 1, wherein: the device also comprises a first conveying pipe; one end of the first conveying pipe is connected to a liquid outlet of the ammonia water tank, the other end of the first conveying pipe is connected to a first material inlet of the hydraulic mixer, and a first manual ball valve, a first pneumatic ball valve and a first flow meter are arranged on the first conveying pipe.
3. The ammonia water conditioning system for SNCR denitration of claim 1, wherein: the device also comprises a second conveying pipe; one end of the second conveying pipe is connected to a liquid outlet of the deionized water tank, the other end of the second conveying pipe is connected to a second feeding port of the hydraulic mixer, and a second manual ball valve, a second pneumatic ball valve and a second flowmeter are arranged on the second conveying pipe.
4. The ammonia water conditioning system for SNCR denitration of claim 2, wherein: and a liquid level meter is installed on the dilution tank and is in signal connection with the first pneumatic ball valve.
5. The ammonia water conditioning system for SNCR denitration of claim 1, wherein: the conveying device also comprises a third conveying pipe, a fourth conveying pipe and a fifth conveying pipe which are connected in sequence; the third conveying pipe is connected to a liquid outlet of the dilution tank, the fifth conveying pipe is connected to a liquid supply opening of the atomization spray gun, and the third conveying pipe is provided with a conveying pump.
6. The ammonia water conditioning system for SNCR denitration of claim 5, wherein: and a third manual ball valve, a third flow meter, an electric regulating valve and a pressure transmitter are arranged on the fourth conveying pipe.
7. The ammonia water conditioning system for SNCR denitration of claim 6, wherein: the device also comprises a sixth conveying pipe; be equipped with the manual ball valve of fourth on the sixth conveyer pipe, first side opening and second side opening have on the fourth conveyer pipe, the manual ball valve of third with the third flowmeter and electrical control valve all is located between first side opening and the second side opening, the one end of sixth conveyer pipe is connected the first side opening department of fourth conveyer pipe, the other end of sixth conveyer pipe is connected the second side opening department of fourth conveyer pipe.
8. The ammonia water conditioning system for SNCR denitration of claim 5, wherein: and a first stop valve and a float flowmeter are arranged on the fifth conveying pipe.
9. The ammonia water conditioning system for SNCR denitration of claim 1, wherein: also comprises a gas supply pipe; be equipped with fifth manual ball valve and second stop valve and manometer on the air supply pipe, the one end of air supply pipe is connected the air feed mouth department of atomizing spray gun, the other end of air supply pipe is connected air compressor's gas transmission mouth department.
10. The ammonia water conditioning system for SNCR denitration of claim 1, wherein: be equipped with first breather valve on the ammonia water jar, be equipped with the second breather valve on the dilution jar.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011425712.XA CN112426859A (en) | 2020-12-08 | 2020-12-08 | Ammonia water regulating system for SNCR (selective non-catalytic reduction) denitration |
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| CN202011425712.XA CN112426859A (en) | 2020-12-08 | 2020-12-08 | Ammonia water regulating system for SNCR (selective non-catalytic reduction) denitration |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115006980A (en) * | 2022-05-20 | 2022-09-06 | 广东五洲药业有限公司 | SNCR flue gas denitration system |
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2020
- 2020-12-08 CN CN202011425712.XA patent/CN112426859A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115006980A (en) * | 2022-05-20 | 2022-09-06 | 广东五洲药业有限公司 | SNCR flue gas denitration system |
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