CN205145960U - Joint demercuration device based on SNCR - Google Patents
Joint demercuration device based on SNCR Download PDFInfo
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- CN205145960U CN205145960U CN201520896897.0U CN201520896897U CN205145960U CN 205145960 U CN205145960 U CN 205145960U CN 201520896897 U CN201520896897 U CN 201520896897U CN 205145960 U CN205145960 U CN 205145960U
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Abstract
The utility model provides a joint demercuration device based on SNCR can effectively combine two kinds of flue gas processing technique, in reduce cost, reaches the purpose of denitration demercuration. It includes connects one set of solution preparation system at two sets of measurement system outputs by two sets of measurement system that the difference is independent to and connect gradually solution conveying system and the solution injection system at solution preparation system output, solution injection system is including spraying import and spray gun, spraying the import and setting up on the furnace in the SNCR system, the spray gun is connected and is gone up and stretch into the furnace setting spraying the import, two sets of measurement system are used for respectively measuring urea and ammonium chloride solid according to the demand of desorption NOx and zeroth order mercury. Join together demercuration technique with SNCR, obtain the superiority of two unifications of technique, develop advance SNCR technology, on the basis of original facility, except that measurement system, do not increase extra manufacturing equipment, make technology economy simple and convenient more, practice thrift and support the cost.
Description
Technical field
The utility model relates to flue gas combined pollutant removing technical field, is specially a kind of associating mercury removal device based on SNCR.
Background technology
Mercury is due to its severe toxicity, high volatile volatile and in biological chain, have the characteristics such as accumulation property, has become global cyclic polluting element, has received the very big concern of Chinese scholars in recent years.Coal-burning power plant discharge Hg can account for anthropogenic discharge's 70%, and therefore mercury pollution emission control in coal-burning power plant's becomes the another focus of current environmental protection.In China's coal, the average content of mercury is approximately 0.22mg/kg, far above world average level 0.13mg/kg, so China's coal-burning power plant's mercury pollution controls to face more acid test.In coal-burning power plant's discharge Hg, nonvalent mercury (Hg0) is main form of export, because its stable in properties is removed more difficult.Therefore, to effective control of nonvalent mercury, to remove be key link in coal-fired flue gas mercury removal technology.
Existing SNCR system is not only simple and initial cost is low, applies comparatively widely in states such as America and Europes, is the selective process that industrial furnace reduces NOx emission, engineering is more and more applied.What require along with environmental protection index improves constantly and the development of energy-saving and cost-reducing economizing economy, has higher requirement to the coal-burning power plant's pollutant combined removal technology based on SNCR technique.
Current Problems existing is: although SNCR technique denitration efficiency is difficult to promote further again, it has very high flexibility and simplicity, can with other technologies conbined usage.In addition, existing demercuration technical costs is higher, and the operating cost as active carbon demercuration is just quite high, and to reach the demercuration efficiency of 90%, often processing one pound of mercury needs 25000-70000 dollar.
Utility model content
For problems of the prior art, the utility model provides a kind of associating mercury removal device based on SNCR, two kinds of fume treatment technology effective can be combined, while reducing costs, reach the object of denitration demercuration.
The utility model is achieved through the following technical solutions:
A kind of associating mercury removal device based on SNCR of the utility model, comprise two covers metering system independently, be connected to a set of solution preparation system of two cover metering system outputs, and be connected to solution delivery system and the solution spraying system of solution preparation system output in turn; Solution spraying system comprises injection import and spray gun; Spraying import is arranged on the burner hearth in SNCR system, and spray gun is connected to spray in import and stretch into burner hearth and arranges; Two described cover metering systems are respectively used to by removing NO
xwith the demand of nonvalent mercury, urea and chloride solid are measured.
Preferably, solution preparation system comprises solution preparation tank; Solution preparation tank comprises the housing being provided with steam jacket, is arranged on the material inlet at top, stretches into the shaft in solution preparation tank from top along axis, and is communicated with the external circulating system of solution preparation tank upper and lower; The main shaft that shaft is coaxially arranged and auxiliary axle, main shaft and auxiliary axle are staggeredly equipped with mixing arm and/or stirring vane; The upper end of main shaft arranges demineralized water import, and the part that main shaft stretches into solution preparation tank is circumferentially provided with apopore; Material inlet is used for adding by removing NO
xthe urea measured with the demand of nonvalent mercury and chloride solid; The bottom of housing is provided with the discharging opening of mixed solution, and side is provided with the steam inlet be communicated with steam jacket.
Further, solution preparation tank adopts drum type brake stirred tank.
Further, solution preparation tank is provided with the temperature sensor for controlling to input in steam inlet quantity of steam.
Further, the inside top of solution preparation tank is provided with spraying system; Input and the demineralized water inlet communication of spraying system are arranged, and the spray gun of spraying system is evenly arranged on the inside top of solution preparation tank.
Preferably, solution preparation system connects heating steam carrier pipe respectively, demineralized water carrier pipe, the urea metering efferent duct of common output and ammonium chloride metering efferent duct; The output of solution preparation system connects the solution savings pipe in solution delivery system through solution pump, the output of solution savings pipe sprays import through circulating pump connection.
Compared with prior art, the utility model has following useful technique effect:
The chloride solid of the utility model by introducing, under the impregnable prerequisite of guarantee denitration efficiency, demercuration technology and SNCR are joined together, the superiority that acquisition technology is two-in-one, the SNCR technique that development is advanced, on the basis of existing facility, except metering system, do not increase extra process equipment, make the easier economy of technique, at least save initial cost cost 10%.The ammonium chloride solution added utilizes the high temperature generation chemical reaction of burner hearth to generate HCl, nonvalent mercury is oxidized to bivalent mercury and carries out adsorbing and removing again, obtain higher demercuration rate, not only meet the requirement of fossil-fuel power plant atmospheric pollutant emission standard, also can be applicable to existing SNCR process and technology innovation, there is boundless application and promotion prospect; Flexible and convenient, successful, initial cost cost is low, transformation is convenient, do not increase extra equipment pipe, decompose by ammonium chloride the ammonia obtained can act synergistically together with the ammonia after urea decomposition, add the expense and space that just can eliminate other equipment of interpolation together simultaneously by means of only raw material; Facilitate the transformation of the old and new's engineering.
Further, by the setting of common solution preparing tank, steam is utilized to carry out continuous heating to mixed solution, prevention crystallisation by cooling while promoting raw material to dissolve, coordinate two mode stirring outer circulation, with certain mixing speed, promote the dissolving of raw material ammonium chloride particle and urea granules.Many groups mixing arm on two shafts and blade composition agitating device, ensure that in cylindrical shell, mixed material reaches longitudinally and axial abundant mixing object within the shortest time.The mode of outer circulation can make the liquid mixing in dissolving tank more abundant, and persistent loop mode also can be avoided, in tank, crystallization or blockage problem locally occur.
Further, utilize the spraying system that solution preparation tank top is arranged, the dust kicked up when effectively compacting feeds intake, reduce material loss, guarantee environmental requirement.
Accompanying drawing explanation
Fig. 1 is the process chart of a kind of associating demercuration method based on SNCR in the utility model example.
Fig. 2 is the structural representation of the solution preparation tank described in the utility model example.
In figure: 1 is heating steam carrier pipe; 2 is demineralized water carrier pipe; 3 is urea metering carrier pipe; 4 is ammonium chloride metering carrier pipe; 5 is solution preparation tank; 6 is solution reservoir; 7 is solution pump; 8 is circulating pump; 9 for spraying import; 10 is SNCR system; 11 is spray gun; 51 is demineralized water import; 52 is material inlet; 53 is temperature sensor; 54 is spraying system; 55 is housing; 56 is main shaft; 57 is auxiliary axle; 58 is external circulating system; 59 is steam inlet.
Detailed description of the invention
Below in conjunction with specific embodiment, the utility model is described in further detail, described in be to explanation of the present utility model instead of restriction.
A kind of associating mercury removal device based on SNCR of the utility model, as shown in Figure 1, it comprises two covers metering system independently, be connected to a set of solution preparation system of two cover metering system outputs, and be connected to solution delivery system and the solution spraying system of solution preparation system output in turn; Solution spraying system comprises injection import 9 and spray gun 11; Spraying import 9 is arranged on the burner hearth in SNCR system 10, and spray gun 11 is connected to spray in import 9 and stretch into burner hearth and arranges; Two cover metering systems are respectively used to by removing NO
xwith the demand of nonvalent mercury, urea and chloride solid are measured.In this preferred embodiment, solution preparation system connects heating steam carrier pipe 1 respectively, demineralized water carrier pipe 2, the urea metering efferent duct 3 of common output and ammonium chloride metering efferent duct 4; The output of solution preparation system connects the solution savings pipe 6 in solution delivery system through solution pump 7, the output of solution savings pipe 6 connects injection import 9 through circulating pump 8.
The utility model, by joining in SNCR system as raw material using solid ammonium chloride together with urea, forms the mixed solution of urea and ammonium chloride, is then together ejected in corresponding flue through SNCR system, the NH obtained by urea and ammonium chloride decomposes
3to NO in flue gas
xcarry out reduction to remove, the HCl obtained by ammonium chloride decomposes carries out oxidation removal to nonvalent mercury in flue gas.When being joined in SNCR system as raw material together with urea by solid ammonium chloride, solid ammonium chloride and urea add in after required ratio mixing or add successively in required ratio.
As depicted in figs. 1 and 2, solution preparation system comprises solution preparation tank 5; Solution preparation tank 5 comprises the housing 55 being provided with steam jacket, is arranged on the material inlet 52 at top, stretches into the shaft in solution preparation tank 5 from top along axis, and is communicated with the external circulating system 58 of solution preparation tank 5 upper and lower; The main shaft 56 that shaft is coaxially arranged and auxiliary axle 57, main shaft 56 and auxiliary axle 57 are staggeredly equipped with mixing arm and/or stirring vane; The upper end of main shaft 56 arranges demineralized water import 51, and the part that main shaft 56 stretches into solution preparation tank 5 is circumferentially provided with apopore; Material inlet 52 is for adding by removing NO
xthe urea measured with the demand of nonvalent mercury and chloride solid; The bottom of housing 55 is provided with the discharging opening of mixed solution, and side is provided with the steam inlet 59 be communicated with steam jacket.In this preferred embodiment, solution preparation tank 5 adopts drum type brake stirred tank.Solution preparation tank 5 is provided with the temperature sensor 53 for controlling to input in steam inlet 59 quantity of steam.The inside top of solution preparation tank 5 is provided with spraying system 54; The input of spraying system 54 is communicated with demineralized water import 51 and arranges, and the spray gun of spraying system 54 is evenly arranged on the inside top of solution preparation tank 5.
Concrete, when the utility model uses, by the NH introduced
4cl solution, when its to mix with urea spray in furnace chamber time, start when being heated to 100 DEG C to decompose, when 337.8 DEG C, be decomposed into ammonia and hydrogen chloride gas completely, the temperature section meeting ammonium chloride decomposition reaction just can obtain the oxidant HCl of nonvalent mercury, carries out demercuration process; Meanwhile, urea CO (NH
2)
2when temperature generates NH higher than starting hydrolysis when 60 DEG C
3and CO
2.Wherein NH
4the urea liquid of Cl solution and SNCR, shares a set of solution allocation system, a set of dissolving induction system, a set of solution spraying system, utilizes existing urea liquid compounding system, induction system and spraying system, do not increase extra e-quipment and pipe; The last same position spraying into burner hearth in the lump, under burner hearth high temperature, obtains oxidant HCl and the denitrification reducing agent NH of mercury respectively
3, the course of reaction related to is as follows:
CO(NH
2)
2+H
2O→CO
2+NH
3
NH
4Cl→NH
3+HCl
4NH
3+4NO+O
2→4N
2+6H
2O
4NH
3+2NO+2O
2→3N
2+6H
2O
8NH
3+6NO→7N
2+12H
2O
The ammonium chloride charging of the program and urea charging, when carrying out solution preparation, a preferred shared solution preparation tank is drum type brake stirred tank, and the shell of tank passes into thermal source, on-the-spot inferior steam can be utilized to carry out continuous heating to mixed solution, prevention crystallisation by cooling while promoting raw material to dissolve.Solution preparation tank tank deck arranges a material inlet, as the common feed mouth of ammonium chloride particle and urea granules, and the charging aperture of a demineralized water, a liquid level gauge, a temperature indicator, there is a solution delivery outlet pot bottom side, connecting conveying pipe road; The demineralized water charging aperture of tank deck is arranged on agitator boss rod, after metering, enter in tank from the inner core of agitator boss rod, on the boss rod stretching into tank inside, 360 ° of directions are uniformly distributed inlet opening, when making agitator work, the each aspect of water inlet all directions is evenly three-dimensional, ensures that the problem not having the reunion of charging dry powder occurs.
The agitator of solution preparation tank adopts two mode stirring outer circulation, with certain mixing speed, promotes the dissolving of raw material ammonium chloride particle and urea granules.Many groups mixing arm on two shafts and blade composition agitating device, ensure that in cylindrical shell, mixed material reaches longitudinally and axial abundant mixing object within the shortest time.The mode of outer circulation can make the liquid mixing in dissolving tank more abundant, and persistent loop mode also can be avoided, in tank, crystallization or blockage problem locally occur.
During first start, ensure the charging when there being the water yield of certain liquid level, according to amount of calculation uniform feeding, at the uniform velocity intake simultaneously, utilize moment of resistance information during agitator constant rotational speed to regulate inflow, coarse adjustment mixed solution concentration, until raw material ammonium chloride, raw material urea, demineralized water all reach amount of calculation, after stirring certain hour, the density of sampling and measuring mixed solution on the spot, fine setting mixed solution density is until burden requirement.
Dissolving tank top cover arranges spraying system, the dust kicked up when effectively compacting feeds intake, and reduces material loss, guarantees environmental requirement.The heating source of dissolving tank is the inlet amount being controlled heating steam by the automatic temperature-sensed device that tank is subsidiary, automatically can stop when in-tank mixing solution temperature reaches design temperature, or automatically open when not reaching design temperature, make that the temperature of dissolving tank is constant all the time is just establishing temperature.
At same solution preparation tank, successively add the urea raw material through metering and ammonium chloride raw material, wherein, urea raw material is packed solid particle, and ammonium chloride raw material is packed solid particle, all meets the certified products parameter request that dispatches from the factory; Share a set of dissolving induction system, the mixed material solution namely after dissolving tank dissolves, after being measured, is pumped into spraying system by measuring pump; Share a set of spraying system, namely mixed solution is through being pumped into spraying system, directly mixed solution is transported to burner hearth jet, and jet shares;
Raw material ammonium chloride and urea after each self-measuring, according to design requirement, for NO in smoke treatment
xthe reduction of discharging requirement of concentration and mercury concentration, adjusts different charging proportionings, obtains different mixed solution matched proportion densities with this, thus obtains the NH of variable concentrations
3denitration demercuration reaction is carried out with HCl.
Successively add successively at its top feed mouth of dissolving tank, or under room temperature, mixing adds, charging rate evenly at a slow speed, unite and dissolve insufficient problem appearance as much as possible by reduction dry powder.
At fire box temperature 900 is 1150 DEG C, the urea liquid decomposes sprayed into is NH
3and CO
2, the ammonium chloride solution decomposes sprayed into is NH
3and HCl, wherein, NH
3nO in flue gas
xreducing agent, HCl is the oxidant of nonvalent mercury in flue gas; Based on the demercuration technology of SNCR, ammonium chloride solution and urea liquid are sprayed into burner hearth in the lump, the product NH after pyrolytic
3denitration demercuration process can be carried out with HCl simultaneously; Can there is redox reaction in NH3 and HCl obtained, reacted cigarette can meet the denitration demercuration discharge index of environmental requirement respectively; Initial cost cost is low, transformation is convenient, does not increase extra equipment pipe, suitable other fume treatment technology of use in conjunction, and the denitration transformation of especially old factory of coal-burning power plant has application prospect comparatively widely.
The a set of public raw material dissolution system of the utility model, a set of public solution delivery system, a set of public solution spraying system are formed; Urea raw material and ammonium chloride raw material, respectively through after metering, dissolve, form the mixed solution of urea and ammonium chloride in the drum type brake dissolving tank carrying heating and agitating function; Mixed solution, by being pumped into spraying system, is sprayed into certain position of burner hearth after flow measurement simultaneously by spraying system; Spray into the mixed solution after burner hearth to be heated and to react, after decomposition, obtain NH
3with HCl gas; NH in suitable temperature window
3as denitrification reducing agent, with the NO of flue gas
xreaction transforms, and reaches NO
xcoal-fired flue-gas pollutant emission requirement; In suitable temperature range, the mercury generation oxidation reaction in HCl and flue gas, nonvalent mercury is converted into the laggard row relax of bivalent mercury, the discharge standard of mercury in meet the requirement of environmental protection; Wherein, the amount of denitrification reducing agent is regulated and controled by the number of urea liquid inlet amount, and the amount of mercury oxidation agent is regulated and controled by the number of ammonium chloride solution inlet amount;
As shown in Figure 2, the tank body external shell 55 of solution preparation tank 5 passes into steam through steam inlet 59 and carries out Heat preservation to the mixed solution in tank, promotes the dissolving of mixed solution simultaneously.Solution preparation tank 5 adopts two agitating mode, is made up of main and auxiliary two shafts, two axles is arranged many group mixing arms and blade, can ensure that in cylindrical shell, mixed material reaches longitudinally and axial abundant mixing object within the shortest time.Dissolving tank adopts external circulating system 58 to carry out outer circulation, and make the liquid mixing in solution preparation tank 5 more abundant, persistent loop mode is avoided, in tank, crystallization or blockage problem locally occur.Solution preparation tank 5 top cover arranges spraying system 54, the dust kicked up when effectively compacting feeds intake, and reduces material loss, guarantees environmental requirement.The temperature sensor 53 of dissolving tank controls the inlet amount of heating steam according to temperature in tank, automatically can stop when in-tank mixing solution temperature reaches design temperature, or automatically open when not reaching design temperature, make that the temperature of dissolving tank is constant all the time is just establishing temperature.
Claims (6)
1. the associating mercury removal device based on SNCR, it is characterized in that, comprise two covers metering system independently, be connected to a set of solution preparation system of two cover metering system outputs, and be connected to solution delivery system and the solution spraying system of solution preparation system output in turn; Solution spraying system comprises injection import (9) and spray gun (11); Spraying import (9) is arranged on the burner hearth in SNCR system (10), and spray gun (11) is connected to injection import (9) and goes up and stretch into burner hearth setting;
Two described cover metering systems are respectively used to by removing NO
xwith the demand of nonvalent mercury, urea and chloride solid are measured.
2. a kind of associating mercury removal device based on SNCR according to claim 1, it is characterized in that, described solution preparation system comprises solution preparation tank (5);
Solution preparation tank (5) comprises the housing (55) being provided with steam jacket, be arranged on the material inlet (52) at top, stretch into the shaft in solution preparation tank (5) from top along axis, and be communicated with the external circulating system (58) of solution preparation tank (5) upper and lower;
The main shaft (56) that shaft is coaxially arranged and auxiliary axle (57), main shaft (56) and auxiliary axle (57) are staggeredly equipped with mixing arm and/or stirring vane; The upper end of main shaft (56) arranges demineralized water import (51), and the part that main shaft (56) stretches into solution preparation tank (5) is circumferentially provided with apopore;
Material inlet (52) is for adding by removing NO
xthe urea measured with the demand of nonvalent mercury and chloride solid;
The bottom of housing (55) is provided with the discharging opening of mixed solution, and side is provided with the steam inlet (59) be communicated with steam jacket.
3. a kind of associating mercury removal device based on SNCR according to claim 2, is characterized in that, solution preparation tank (5) adopts drum type brake stirred tank.
4. a kind of associating mercury removal device based on SNCR according to claim 2, is characterized in that, solution preparation tank (5) is provided with the temperature sensor (3) for controlling input quantity of steam in steam inlet (59).
5. a kind of associating mercury removal device based on SNCR according to claim 2, is characterized in that, the inside top of solution preparation tank (5) is provided with spraying system (54); The input of spraying system (54) is communicated with demineralized water import (51) and arranges, and the spray gun of spraying system (54) is evenly arranged on the inside top of solution preparation tank (5).
6. a kind of associating mercury removal device based on SNCR according to claim 1, it is characterized in that, solution preparation system connects respectively heating steam carrier pipe (1), demineralized water carrier pipe (2), urea metering efferent duct (3) of common output and ammonium chloride metering efferent duct (4); The solution that the output of solution preparation system connects in solution delivery system through solution pump (7) saves pipe (6), and the output of solution savings pipe (6) connects injection import (9) through circulating pump (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520896897.0U CN205145960U (en) | 2015-11-11 | 2015-11-11 | Joint demercuration device based on SNCR |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520896897.0U CN205145960U (en) | 2015-11-11 | 2015-11-11 | Joint demercuration device based on SNCR |
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| Publication Number | Publication Date |
|---|---|
| CN205145960U true CN205145960U (en) | 2016-04-13 |
Family
ID=55681703
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|---|---|---|---|
| CN201520896897.0U Expired - Fee Related CN205145960U (en) | 2015-11-11 | 2015-11-11 | Joint demercuration device based on SNCR |
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|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268300A (en) * | 2015-11-11 | 2016-01-27 | 中国华能集团公司 | Joint mercury removing method and device based on SNCR |
-
2015
- 2015-11-11 CN CN201520896897.0U patent/CN205145960U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268300A (en) * | 2015-11-11 | 2016-01-27 | 中国华能集团公司 | Joint mercury removing method and device based on SNCR |
| CN105268300B (en) * | 2015-11-11 | 2017-11-14 | 中国华能集团公司 | A kind of joint demercuration method and device based on SNCR |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160413 Termination date: 20171111 |