CN111135714A - Method for using ammonium bicarbonate as SCR denitration reducing agent - Google Patents

Method for using ammonium bicarbonate as SCR denitration reducing agent Download PDF

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CN111135714A
CN111135714A CN202010044451.0A CN202010044451A CN111135714A CN 111135714 A CN111135714 A CN 111135714A CN 202010044451 A CN202010044451 A CN 202010044451A CN 111135714 A CN111135714 A CN 111135714A
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ammonium bicarbonate
denitration
bicarbonate solution
ammonium
flue
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袁英刚
高徐平
陈苏
宗瑾涛
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Anhui Chenxi Clean Technology Co ltd
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Anhui Chenxi Clean Technology Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/90Injecting reactants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8621Removing nitrogen compounds
    • B01D53/8625Nitrogen oxides
    • B01D53/8631Processes characterised by a specific device
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F21/00Dissolving
    • B01F21/10Dissolving using driven stirrers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/80After-treatment of the mixture
    • B01F23/811Heating the mixture
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05Stirrers
    • B01F27/11Stirrers characterised by the configuration of the stirrers
    • B01F27/112Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1125Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis
    • B01F27/11251Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis having holes in the surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/90Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms 
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01CAMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00Ammonia; Compounds thereof
    • C01C1/02Preparation, purification or separation of ammonia
    • C01C1/026Preparation of ammonia from inorganic compounds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/20Reductants
    • B01D2251/206Ammonium compounds
    • B01D2251/2062Ammonia
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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Abstract

The invention provides a method for using ammonium bicarbonate as a reducing agent for SCR denitration. The method for using ammonium bicarbonate as the SCR denitration reducing agent comprises the following steps: s1, selecting a denitration inlet flue, a denitration reactor, a denitration outlet flue, an ammonium bicarbonate powder bin, a star-shaped discharge valve, an ammonium bicarbonate solution tank, an ammonium bicarbonate stirrer, an ammonium bicarbonate solution pump, an ammonium bicarbonate evaporator, an overflow pipeline and a thermometer; and S2, adding purchased ammonium bicarbonate powder into an ammonium bicarbonate powder bin. According to the method for using the ammonium bicarbonate as the SCR denitration reducing agent, ammonia gas is obtained by decomposing the ammonium bicarbonate by using the heat of the flue gas for denitration, the method is simple, and a heating device is not required; and the ammonium bicarbonate is adopted as a reducing agent, so that the ammonium bicarbonate is very convenient to purchase, transport and store, and accords with the actual conditions of small-smoke-gas-volume device enterprises; the ammonia gas generated after the decomposition of the ammonium bicarbonate, the carbon dioxide and the water vapor directly enter the flue gas to be mixed, so that the problems of leakage and safety do not exist.

Description

Method for using ammonium bicarbonate as SCR denitration reducing agent
Technical Field
The invention relates to the field of SCR denitration, in particular to a method for taking ammonium bicarbonate as an SCR denitration reducing agent.
Background
A certain amount of dust and SO are generated in the production processes of coal burning, coking, glass and the like2Nitrogen Oxide (NO)X) Harmful metal elements and the like, NO in flue gasXEmission ratio of (3)2The harm to environment is more serious, and a large amount of Nitrogen Oxide (NO)X) The emission of (2) causes a series of environmental problems such as acid rain, photochemical smog, ozone layer damage, greenhouse effect and the like, particularly the serious 'haze' phenomenon which appears in most places in recent years is the root of Nitric Oxide (NO)X) To control atmospheric Nitrogen Oxides (NO)X) The emission of (b) has attracted global attention and is also a key point and difficulty of protection in the current atmospheric environment, and therefore, NOXIs particularly important.
Along with the increasingly strict environmental protection policy and the vigorous development of energy conservation and emission reduction work, NO is treated by the nationXThe emission requirements are more and more strict, which results in that more and more small-sized devices with the emission of flue gas of thousands to tens of thousands need to be newly built with a denitration device, such as an airport gas boiler, a steel mill gas boiler and the like. Most of the small smoke gas devices are in the industries of non-coal, steel and chemical industry;
according to the maturity of the current domestic SCR denitration technology, the denitration of the small-smoke-gas-quantity device has no technical problem, but the reducing agents ammonia gas, ammonia water or urea used for SCR denitration are used in the non-coal, steel and chemical industries to cause some problems.
As for ammonia and ammonia water as reducing agents, firstly, the reducing agents are rarely used in the industry, and the property of the ammonia and the ammonia water is less understood by the owner, so that certain dangers exist in the use; secondly, the demand of the reducing agent of the small smoke gas device is generally small, and the transportation and storage of ammonia gas and ammonia water in enterprises of the type are problematic; finally, industrial ammonia is a hazardous chemical, and most owners have concerns about the safety of the use of such reducing agents, and are reluctant to use ammonia-based reducing agents.
The urea is used as the reducing agent, ammonia is decomposed after urea pyrolysis or hydrolysis to participate in SCR denitration reaction, the urea pyrolysis or hydrolysis needs high temperature and heat, and most non-coal, steel and chemical enterprises do not have urea pyrolysis or hydrolysis conditions. Even if conditions are met, a large amount of heat is consumed.
Therefore, it is necessary to provide a method of using ammonium bicarbonate as a reducing agent for SCR denitration to solve the above technical problems.
Disclosure of Invention
The invention provides a method for using ammonium bicarbonate as a SCR denitration reducing agent, which solves the problems of complex process, additional heating device, leakage and safety damage caused by the adoption of urea, ammonia gas and ammonia water as reducing agents in the prior art.
In order to solve the technical problem, the method for using ammonium bicarbonate as the SCR denitration reducing agent provided by the invention comprises the following steps:
s1, selecting a denitration inlet flue, a denitration reactor, a denitration outlet flue, an ammonium bicarbonate powder bin, a star-shaped discharge valve, an ammonium bicarbonate solution tank, an ammonium bicarbonate stirrer, an ammonium bicarbonate solution pump, an ammonium bicarbonate evaporator, an overflow pipeline and a thermometer;
s2, adding purchased ammonium bicarbonate powder into an ammonium bicarbonate powder bin, then quantitatively adding the purchased ammonium bicarbonate powder into an ammonium bicarbonate solution tank through a star-shaped discharge valve, then adding a water source, and then stirring the ammonium bicarbonate powder and the water source through an ammonium bicarbonate stirrer to form an ammonium bicarbonate solution with a certain concentration;
s3, pressurizing and conveying the ammonium bicarbonate solution in the S2 to an ammonium bicarbonate evaporator through an ammonium bicarbonate solution pump;
s4, heating the ammonium bicarbonate solution in the ammonium bicarbonate evaporator by using the high-temperature flue gas in the denitration inlet flue, so that ammonia gas and carbon dioxide are decomposed from the ammonium bicarbonate solution, and water in the ammonium bicarbonate solution is evaporated into steam;
and S5, the mixed gas of ammonia gas, carbon dioxide and water vapor decomposed and evaporated by the ammonium bicarbonate solution in the S3 enters the denitration inlet flue through the emptying pipe, is mixed with the flue gas in the flue, and then enters the denitration reactor, so that the ammonia gas in the mixed gas participates in the SCR denitration reaction.
Preferably, the concentration of the ammonium bicarbonate powder in the S2 is more than or equal to 40%, the concentration of the ammonium bicarbonate solution is 18-35%, and the internal temperature of the ammonium bicarbonate solution tank is 50-70 ℃.
The ammonia gas obtained by decomposing the ammonium bicarbonate by utilizing the heat of the flue gas is used for denitration, and the method is simple and does not need to be additionally provided with a heating device.
And the ammonium bicarbonate is adopted as a reducing agent, so that the purchase, the transportation and the storage of the ammonium bicarbonate are very convenient, and the ammonium bicarbonate meets the actual conditions of small-smoke-gas-volume device enterprises.
Ammonia gas generated by decomposing ammonium bicarbonate, carbon dioxide and water vapor directly enter flue gas to be mixed, so that leakage and safety problems do not exist;
preferably, the ammonium bicarbonate evaporator in S3 is a normal pressure heat exchange device, and the ammonium bicarbonate evaporator is installed inside the denitration inlet flue.
Preferably, the upper part of the ammonium bicarbonate evaporator in the S3 is provided with a plurality of groups of vent pipes which are uniformly distributed in the cross section of the flue.
Preferably, the ammonium bicarbonate evaporator in S4 is provided with an overflow pipe, the device is fluctuated in operation, and when the solution in the evaporator is excessive, the excessive solution can flow back to the ammonium bicarbonate solution tank through the overflow pipe for recycling.
Preferably, when the method of using ammonium bicarbonate as a reducing agent for SCR denitration needs to be operated, the method further comprises the following steps: the denitration device comprises a denitration inlet flue, an ammonium bicarbonate solution pump and an ammonium bicarbonate solution tank;
an absorption port of the ammonium bicarbonate solution pump is communicated with an absorption pipe, a discharge port of the ammonium bicarbonate solution pump is communicated with a discharge pipe, one end of the discharge pipe penetrates through the denitration inlet flue and extends to the inside of the denitration inlet flue, and an ammonium bicarbonate evaporator is arranged at one end of the discharge pipe extending to the inside of the denitration inlet flue;
an ammonium bicarbonate powder bin is arranged on one side of the top of the ammonium bicarbonate solution tank, a star-shaped discharge valve is arranged at the bottom of the ammonium bicarbonate powder bin, and an ammonium bicarbonate stirrer is arranged on the other side of the top of the ammonium bicarbonate solution tank;
one end of the denitration inlet flue is provided with a denitration reactor, and the bottom of the denitration reactor is provided with a denitration outlet flue.
Preferably, the absorption pipe is communicated with the inside of the ammonium bicarbonate solution tank, and two sides of the ammonium bicarbonate evaporator are respectively arranged on two sides of the inner wall of the denitration inlet flue.
Preferably, one side of the ammonium bicarbonate evaporator is provided with an overflow pipeline, and one end of the overflow pipeline is communicated with the inside of the ammonium bicarbonate solution tank.
Preferably, the top of ammonium acid solution tank is provided with the motor case, one side fixedly connected with motor of the inner wall of motor case, the output shaft fixedly connected with (mixing) shaft of motor, the bottom of (mixing) shaft runs through ammonium acid solution tank and extends to the inside of ammonium acid solution tank, the (mixing) shaft extends to the equal fixedly connected with in both sides of the inside of ammonium acid solution tank stirs the leaf, so the (mixing) shaft is located the both sides of the inside of ammonium acid solution tank all are provided with arc clearance piece, and are located the bottom of first stirring leaf.
Preferably, both sides of the inner wall of the ammonium solution tank are provided with second stirring blades, and the front surfaces of the second stirring blades and the first stirring blades are provided with through holes.
Compared with the related art, the method for using ammonium bicarbonate as the SCR denitration reducing agent has the following beneficial effects:
the invention provides a method for taking ammonium bicarbonate as a SCR denitration reducing agent, which comprises the steps of discharging an ammonium bicarbonate solution into an ammonium bicarbonate evaporator, heating the ammonium bicarbonate solution in the ammonium bicarbonate evaporator by using high-temperature flue gas in a denitration inlet flue, decomposing ammonia gas and carbon dioxide from the ammonium bicarbonate solution, evaporating water in the ammonium bicarbonate solution into steam, and finally enabling mixed gas of the ammonia gas, the carbon dioxide and the steam decomposed and evaporated from the ammonium bicarbonate solution to enter the denitration inlet flue through an emptying pipe, be mixed with the flue gas in the flue and then enter a denitration reactor to enable the ammonia gas in the mixed gas to participate in SCR denitration reaction;
the ammonia gas is obtained by decomposing the ammonium bicarbonate by utilizing the heat of the flue gas for denitration, the method is simple, and no additional heating device is needed; and the ammonium bicarbonate is adopted as a reducing agent, so that the ammonium bicarbonate is very convenient to purchase, transport and store, and accords with the actual conditions of small-smoke-gas-volume device enterprises; ammonia gas generated by decomposing ammonium bicarbonate, carbon dioxide and water vapor directly enter flue gas to be mixed, so that leakage and safety problems do not exist; the method adjusts the adding amount of the ammonium bicarbonate in a bidirectional way through the concentration of the ammonium bicarbonate solution and the adding amount of the ammonium bicarbonate solution, and ensures that the reducing agent is supplied stably.
Drawings
FIG. 1 is a schematic structural diagram of a method for using ammonium bicarbonate as a reducing agent for SCR denitration provided by the present invention;
FIG. 2 is a schematic structural view of the ammonium bicarbonate solution tank of FIG. 1 according to the present invention.
Reference numbers in the figures: 1. denitration import flue, 2, ammonium bicarbonate solution pump, 3, ammonium bicarbonate solution tank, 4, the absorption tube, 5, the delivery pipe, 6, ammonium bicarbonate evaporimeter, 7, ammonium bicarbonate powder storehouse, 8, star type discharge valve, 9, ammonium bicarbonate agitator, 10, denitration reactor, 11, denitration export flue, 12, overflow pipeline, 13, motor case, 14, the motor, 15, (mixing) shaft, 16, first stirring leaf, 17, arc clearance piece, 18, second stirring leaf, 19, through-hole.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
Referring to fig. 1 and fig. 2 in combination, wherein fig. 1 is a schematic structural diagram of a method for using ammonium bicarbonate as a reducing agent for SCR denitration according to the present invention; FIG. 2 is a schematic structural view of the ammonium bicarbonate solution tank of FIG. 1 according to the present invention. The method for using ammonium bicarbonate as the SCR denitration reducing agent comprises the following steps:
s1, selecting a denitration inlet flue 1, a denitration reactor 10, a denitration outlet flue 11, an ammonium bicarbonate powder bin 7, a star-shaped discharge valve 8, an ammonium bicarbonate solution tank 3, an ammonium bicarbonate stirrer 9, an ammonium bicarbonate solution pump 2, an ammonium bicarbonate evaporator 6, an overflow pipeline 12 and a thermometer;
s2, adding purchased ammonium bicarbonate powder into an ammonium bicarbonate powder bin 7, then quantitatively adding the purchased ammonium bicarbonate powder into an ammonium bicarbonate solution tank 3 through a star-shaped discharge valve 8, then adding a water source, and then stirring the ammonium bicarbonate powder and the water source through an ammonium bicarbonate stirrer 9 to form an ammonium bicarbonate solution;
s3, pressurizing and conveying the ammonium bicarbonate solution in the S2 to an ammonium bicarbonate evaporator 6 through an ammonium bicarbonate solution pump 2;
s4, heating the ammonium bicarbonate solution in the ammonium bicarbonate evaporator 6 by using the high-temperature flue gas in the denitration inlet flue 1, so that ammonia gas and carbon dioxide are decomposed from the ammonium bicarbonate solution, and water in the ammonium bicarbonate solution is evaporated into steam;
s5, the mixed gas of ammonia gas, carbon dioxide and water vapor decomposed and evaporated by the ammonium bicarbonate solution in the S3 enters the denitration inlet flue 1 through the emptying pipe, is mixed with the flue gas in the flue, and then enters the denitration reactor 10, so that the ammonia gas in the mixed gas participates in the SCR denitration reaction;
the ammonium bicarbonate solution in S2 forms a concentrated ammonium bicarbonate solution due to the added water source.
The concentration of the ammonium bicarbonate powder in the S2 is more than or equal to 40%, the concentration of the ammonium bicarbonate solution is 18-35%, and the internal temperature of the ammonium bicarbonate solution tank 3 is 50-70 ℃.
The ammonia gas obtained by decomposing the ammonium bicarbonate by utilizing the heat of the flue gas is used for denitration, and the method is simple and does not need to be additionally provided with a heating device.
And the ammonium bicarbonate is adopted as a reducing agent, so that the purchase, the transportation and the storage of the ammonium bicarbonate are very convenient, and the ammonium bicarbonate meets the actual conditions of small-smoke-gas-volume device enterprises.
The ammonia gas generated after the decomposition of the ammonium bicarbonate, the carbon dioxide and the water vapor directly enter the flue gas to be mixed, so that the problems of leakage and safety do not exist.
The method regulates the adding amount of the ammonium bicarbonate in a bidirectional way through the concentration of the ammonium bicarbonate solution and the adding amount of the ammonium bicarbonate solution, and ensures that the reducing agent is supplied stably;
ammonium sulfate, colorless, translucent, hard crystals or powder, readily soluble in water, insoluble in ethanol, concentrated ammonia water and carbon disulfide; ammonium bicarbonate is unstable in air and gradually becomes ammonium bicarbonate and ammonium carbamate; the dried product is easily decomposed at 58 ℃ to release ammonia and carbon dioxide; the aqueous solution starts to decompose at 70 ℃;
adding purchased ammonium bicarbonate powder (with concentration not less than 40%) into an ammonium bicarbonate powder bin 7, quantitatively adding water into an ammonium bicarbonate solution tank 3 through a star-shaped discharge valve 8 by calculating the mixture ratio, stirring and mixing the ammonium bicarbonate solution with concentration of 18-35% through an ammonium bicarbonate stirrer 9, arranging a thermometer in the ammonium bicarbonate solution tank 3, and controlling the temperature to be less than 70 DEG C
Ammonium bicarbonate evaporator 6 in S3 is normal pressure heat transfer device, and ammonium bicarbonate evaporator 6 installs the inside at denitration import flue 1.
And a plurality of groups of emptying pipes are arranged at the upper part of the ammonium bicarbonate evaporator 6 in the S3 and are uniformly distributed in the section of the flue.
And an overflow pipeline 12 is arranged on the ammonium bicarbonate evaporator 6 in the S4, the operation of the device has fluctuation, and when the solution in the evaporator is excessive, the excessive solution can flow back to the ammonium bicarbonate solution tank 3 through the overflow pipeline 12 for recycling.
When the method for using the ammonium bicarbonate as the SCR denitration reducing agent needs to be operated, the method further comprises the following steps: a denitration inlet flue 1, an ammonium bicarbonate solution pump 2 and an ammonium bicarbonate solution tank 3;
an absorption port of the ammonium bicarbonate solution pump 2 is communicated with an absorption pipe 4, a discharge port of the ammonium bicarbonate solution pump 2 is communicated with a discharge pipe 5, one end of the discharge pipe 5 penetrates through the denitration inlet flue 1 and extends to the inside of the denitration inlet flue 1, and one end of the discharge pipe 5 extending to the inside of the denitration inlet flue 1 is provided with an ammonium bicarbonate evaporator 6;
an ammonium bicarbonate powder bin 7 is arranged on one side of the top of the ammonium bicarbonate solution tank 3, a star-shaped discharge valve 8 is arranged at the bottom of the ammonium bicarbonate powder bin 7, and an ammonium bicarbonate stirrer 9 is arranged on the other side of the top of the ammonium bicarbonate solution tank 3;
ammonium bicarbonate solution pump 2, ammonium bicarbonate evaporimeter 6, star type discharge valve 8 and ammonium bicarbonate agitator 9 all adopt current ripe device for the denitration work.
A denitration reactor 10 is arranged at one end of the denitration inlet flue 1, and a denitration outlet flue 11 is arranged at the bottom of the denitration reactor 10;
the flue gas and the mixed gas can be subjected to denitration reaction through the denitration reactor 10, and finally discharged through the denitration outlet flue 11.
The absorption pipe 4 is communicated with the interior of the ammonium bicarbonate solution tank 3, and two sides of the ammonium bicarbonate evaporator 6 are respectively arranged on two sides of the inner wall of the denitration inlet flue 1;
the ammonium bicarbonate solution in the ammonium bicarbonate solution tank 3 is absorbed by the absorption pipe 4.
An overflow pipeline 12 is arranged on one side of the ammonium bicarbonate evaporator 6, and one end of the overflow pipeline 12 is communicated with the interior of the ammonium bicarbonate solution tank 3;
through the arrangement of the overflow pipeline 12, when the solution in the ammonium bicarbonate evaporator 6 is excessive, the excessive solution can flow back to the ammonium bicarbonate solution tank 3 through the overflow pipeline 12 for recycling.
A motor box 13 is arranged at the top of the ammonium salt solution tank 3, a motor 14 is fixedly connected to one side of the inner wall of the motor box 13, an output shaft of the motor 14 is fixedly connected with a stirring shaft 15, the bottom end of the stirring shaft 15 penetrates through the ammonium salt solution tank 3 and extends into the ammonium salt solution tank 3, and first stirring blades 16 are fixedly connected to both sides of the stirring shaft 15 extending into the ammonium salt solution tank 3, so that arc-shaped cleaning blocks 17 are arranged on both sides of the stirring shaft 15 positioned in the ammonium salt solution tank 3 and positioned at the bottom of the first stirring blades 16;
motor 14 is connected with external power and control switch, and is just reversing the motor for it is rotatory to drive (mixing) shaft 15, indirectly drives first stirring leaf 16 and rotates, thereby cooperation second stirring leaf 18 fully stirs ammonium bicarbonate powder and water source, and the rotation of (mixing) shaft 15 can drive arc clearance piece 17 and rotate moreover, thereby can drive or clear up the bottom in ammonium bicarbonate solution tank, the integration of ammonium bicarbonate powder and water source of being convenient for.
Two sides of the inner wall of the ammonium solution tank 3 are both provided with second stirring blades 18, and the front surfaces of the second stirring blades 18 and the first stirring blades 16 are provided with through holes 19;
the water source in the mixing of being convenient for carries ammonium bicarbonate powder to move, the integration of ammonium bicarbonate powder and water source of being convenient for more through-hole 19.
The working principle of the method for using ammonium bicarbonate as the SCR denitration reducing agent is as follows:
adding purchased ammonium bicarbonate powder into an ammonium bicarbonate powder bin 7, quantitatively adding the purchased ammonium bicarbonate powder into an ammonium bicarbonate solution tank 3 through a star-shaped discharge valve 8, adding a water source, and stirring the ammonium bicarbonate powder and the water source through starting an ammonium bicarbonate stirrer 9 to form an ammonium bicarbonate solution;
discharging the ammonium bicarbonate solution in the ammonium bicarbonate solution tank 3 into an ammonium bicarbonate evaporator 6 through an ammonium bicarbonate solution pump 2, and heating the ammonium bicarbonate solution in the ammonium bicarbonate evaporator 6 by using high-temperature flue gas in a denitration inlet flue 1, so that ammonia gas and carbon dioxide are decomposed from the ammonium bicarbonate solution, and water in the ammonium bicarbonate solution is evaporated into steam;
the mixed gas of ammonia gas, carbon dioxide and water vapor decomposed and evaporated by the ammonium bicarbonate solution enters the denitration inlet flue 1 through the vent pipe, is mixed with the flue gas in the flue and then enters the denitration reactor 10, so that the ammonia gas in the mixed gas participates in the SCR denitration reaction.
Compared with the related art, the method for using ammonium bicarbonate as the SCR denitration reducing agent has the following beneficial effects:
discharging the ammonium bicarbonate solution into an ammonium bicarbonate evaporator 6, heating the ammonium bicarbonate solution in the ammonium bicarbonate evaporator 6 by using high-temperature flue gas in a denitration inlet flue 1, so that ammonia gas and carbon dioxide are decomposed from the ammonium bicarbonate solution, water in the ammonium bicarbonate solution is evaporated into steam, and finally, mixed gas of the ammonia gas, the carbon dioxide and the steam decomposed and evaporated from the ammonium bicarbonate solution enters the denitration inlet flue 1 through an emptying pipe, is mixed with the flue gas in the flue, and then enters a denitration reactor 10, so that the ammonia gas in the mixed gas participates in SCR denitration reaction;
the ammonia gas is obtained by decomposing the ammonium bicarbonate by utilizing the heat of the flue gas for denitration, the method is simple, and no additional heating device is needed; and the ammonium bicarbonate is adopted as a reducing agent, so that the ammonium bicarbonate is very convenient to purchase, transport and store, and accords with the actual conditions of small-smoke-gas-volume device enterprises; ammonia gas generated by decomposing ammonium bicarbonate, carbon dioxide and water vapor directly enter flue gas to be mixed, so that leakage and safety problems do not exist; the method adjusts the adding amount of the ammonium bicarbonate in a bidirectional way through the concentration of the ammonium bicarbonate solution and the adding amount of the ammonium bicarbonate solution, and ensures that the reducing agent is supplied stably.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A method for using ammonium bicarbonate as a reducing agent for SCR denitration is characterized by comprising the following steps:
s1, selecting a denitration inlet flue, a denitration reactor, a denitration outlet flue, an ammonium bicarbonate powder bin, a star-shaped discharge valve, an ammonium bicarbonate solution tank, an ammonium bicarbonate stirrer, an ammonium bicarbonate solution pump, an ammonium bicarbonate evaporator, an overflow pipeline and a thermometer;
s2, adding purchased ammonium bicarbonate powder into an ammonium bicarbonate powder bin, then quantitatively adding the purchased ammonium bicarbonate powder into an ammonium bicarbonate solution tank through a star-shaped discharge valve, then adding a water source, and then stirring the ammonium bicarbonate powder and the water source through an ammonium bicarbonate stirrer to form an ammonium bicarbonate solution;
s3, pressurizing and conveying the ammonium bicarbonate solution in the S2 to an ammonium bicarbonate evaporator through an ammonium bicarbonate solution pump;
s4, heating the ammonium bicarbonate solution in the ammonium bicarbonate evaporator by using the high-temperature flue gas in the denitration inlet flue, so that ammonia gas and carbon dioxide are decomposed from the ammonium bicarbonate solution, and water in the ammonium bicarbonate solution is evaporated into steam;
and S5, the mixed gas of ammonia gas, carbon dioxide and water vapor decomposed and evaporated by the ammonium bicarbonate solution in the S3 enters the denitration inlet flue through the emptying pipe, is mixed with the flue gas in the flue, and then enters the denitration reactor, so that the ammonia gas in the mixed gas participates in the SCR denitration reaction.
2. The method of claim 1, wherein the concentration of the ammonium bicarbonate powder in the S2 is equal to or more than 40%, the concentration of the ammonium bicarbonate solution is 18-35%, and the internal temperature of the ammonium bicarbonate solution tank is 50-70 ℃.
3. The method of claim 1, wherein the ammonium bicarbonate evaporator in S3 is a normal pressure heat exchange device, and the ammonium bicarbonate evaporator is installed inside the denitration inlet flue.
4. The method of claim 1, wherein a plurality of sets of blow-down pipes are arranged at the upper part of the ammonium bicarbonate evaporator in the S3 and are uniformly distributed in the cross section of the flue.
5. The method of claim 1, wherein an overflow pipe is provided on the ammonium bicarbonate evaporator in S4, the device is operated in a fluctuating way, and when the solution in the evaporator is too much, the excess solution can be returned to the ammonium bicarbonate solution tank through the overflow pipe for recycling.
6. The method of claim 1, wherein when the method of ammonium bicarbonate as a reducing agent for SCR denitration requires operation, further comprising: the denitration device comprises a denitration inlet flue, an ammonium bicarbonate solution pump and an ammonium bicarbonate solution tank;
an absorption port of the ammonium bicarbonate solution pump is communicated with an absorption pipe, a discharge port of the ammonium bicarbonate solution pump is communicated with a discharge pipe, one end of the discharge pipe penetrates through the denitration inlet flue and extends to the inside of the denitration inlet flue, and an ammonium bicarbonate evaporator is arranged at one end of the discharge pipe extending to the inside of the denitration inlet flue;
an ammonium bicarbonate powder bin is arranged on one side of the top of the ammonium bicarbonate solution tank, a star-shaped discharge valve is arranged at the bottom of the ammonium bicarbonate powder bin, and an ammonium bicarbonate stirrer is arranged on the other side of the top of the ammonium bicarbonate solution tank;
one end of the denitration inlet flue is provided with a denitration reactor, and the bottom of the denitration reactor is provided with a denitration outlet flue.
7. The method of claim 6, wherein the absorption pipe is communicated with the inside of the ammonium bicarbonate solution tank, and two sides of the ammonium bicarbonate evaporator are respectively arranged on two sides of the inner wall of the denitration inlet flue.
8. The method of claim 6, wherein an overflow pipe is provided at one side of the ammonium bicarbonate evaporator, and one end of the overflow pipe is communicated with the inside of the ammonium bicarbonate solution tank.
9. The method of claim 6, wherein a motor box is arranged at the top of the ammonium acid solution tank, a motor is fixedly connected to one side of the inner wall of the motor box, a stirring shaft is fixedly connected to the output shaft of the motor, the bottom end of the stirring shaft penetrates through the ammonium acid solution tank and extends to the inside of the ammonium acid solution tank, and first stirring blades are fixedly connected to both sides of the stirring shaft extending to the inside of the ammonium acid solution tank, so that arc-shaped cleaning blocks are arranged on both sides of the stirring shaft located in the inside of the ammonium acid solution tank and located at the bottom of the first stirring blades.
10. The method of claim 9, wherein the two sides of the inner wall of the ammonium carbonate solution tank are provided with second stirring blades, and the front surfaces of the second stirring blades and the first stirring blades are provided with through holes.
CN202010044451.0A 2020-01-15 2020-01-15 Method for using ammonium bicarbonate as SCR denitration reducing agent Pending CN111135714A (en)

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CN201537458U (en) * 2009-11-24 2010-08-04 辽宁科林环保工程有限责任公司 Industrial device for reducing nitrogen oxide in fire coal station boiler flue gas with ammonium bicarbonate
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CN201537458U (en) * 2009-11-24 2010-08-04 辽宁科林环保工程有限责任公司 Industrial device for reducing nitrogen oxide in fire coal station boiler flue gas with ammonium bicarbonate
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