CN202237748U - SNCR (selective non catalytic reduction) flue gas denitration device taking carbamide as reducing agent - Google Patents
SNCR (selective non catalytic reduction) flue gas denitration device taking carbamide as reducing agent Download PDFInfo
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- CN202237748U CN202237748U CN201120294665XU CN201120294665U CN202237748U CN 202237748 U CN202237748 U CN 202237748U CN 201120294665X U CN201120294665X U CN 201120294665XU CN 201120294665 U CN201120294665 U CN 201120294665U CN 202237748 U CN202237748 U CN 202237748U
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Abstract
The utility model discloses an SNCR (selective non catalytic reduction) flue gas denitration device taking carbamide as a reducing agent, which comprises a solid carbamide tanker, a hose, a movable joint, a solid carbamide adjusting valve, a solid carbamide storage tank, a solid carbamide feeding machine, a compressed air header pipe, a compressed air adjusting valve, a stirrer, a carbamide solution preparing tank, a heater, an industrial water header pipe, an industrial water adjusting valve, a carbamide transporting pump, a carbamide solution storage tank, a carbamide jetting pump, a mixer, a carbamide backflow adjusting valve, a pressurized industrial water adjusting valve, an industrial water pump, a carbamide dilute solution adjusting valve, an atomization steam adjusting valve, an atomization steam header pipe and a carbamide jetting unit. When carbamide is canned, the fully-automatic continuous feeding can be realized, the concentration and the uniformity of a carbamide solution can be ensured, and the carbamide flow can be automatically adjusted according to the NOx discharging amount of burning equipment, so that the NOx discharging amount of the burning equipment can be controlled in a certain range and the denitration effect can reach 60 percent; and when carbamide in bags is supplied, the carbamide is supplied to the carbamide solution preparing tank manually, and the carbamide preparation can be carried out discontinuously.
Description
Technical field
The utility model relates to a kind of equipment for denitrifying flue gas, and particularly relating to a kind of is the SNCR equipment for denitrifying flue gas of reducing agent with urea.
Background technology
In the denitrating flue gas field, SCR (SCR) and two kinds of methods of non-selective catalytic reduction (SNCR) have obtained extensive use.These two kinds of methods are all with NH
3Deng being reducing agent, be reduced to harmless N to NOx
2And H
2O.The SNCR method is that the reducing agent aqueous solution such as ammonia or urea are sprayed in the middle of 850 ~ 1150 ℃ the flue gas, realizes the reduction reaction of NOx.Because it does not take the space of combustion apparatus basically, the retrofit work amount is little, and the transformation cycle is short, thereby obtains bigger application.Because the urea good stability is nontoxic, safe, be convenient to storage, therefore adopting urea is optimal selection as the reducing agent of SNCR method.Because urea is solid particle, dissolving needs heat absorption in water, and has certain corrosivity, and especially concentration, uniformity and the atomizing particle size distribution after the dilution, the temperature window that sprays into etc. are very big to the denitration effect influence.At present the actual denitration efficiency of SNCR technology only about 30%, and sprayed into position water-wall corrosion situation, and this has restricted the SNCR The Application of Technology.
Summary of the invention
In order to solve the problem that exists in the background technology; It is the SNCR equipment for denitrifying flue gas of reducing agent with urea that the purpose of the utility model is to provide a kind of; Solve problems such as solid urea particle dissolving, mixing and injection, realize the work of SNCR plant automation high efficient and reliable.
The utility model solves the technical scheme that its technical problem adopted:
The utility model comprises agitator, urea liquid preparation jar, heater, industry water house steward, industry water control valve, urea delivery pump, urea liquid holding vessel, urea-spray pump, blender, urea return valve, pressurization industry water control valve, industrial water pump, urea weak solution control valve, atomizing steam control valve, atomizing steam house steward and urea-spray unit; Urea liquid prepares jar top and is connected through industry water control valve and industry water house steward, is equiped with primary heater and agitator in the urea liquid preparation jar, makes the connection of urea liquid preparation jar and urea liquid holding vessel through the urea delivery pump; In the urea liquid holding vessel secondary heater is set; The urea-spray pump intake is connected with the bottom of urea liquid holding vessel; The urea-spray pump discharge links to each other with an end of blender and urea return valve respectively, and the other end of urea return valve is connected with the top of urea liquid holding vessel; The centre of blender is connected with an end of pressurization industry water control valve, and the other end of pressurization industry water control valve is connected with the industrial water pump outlet, and the import of industrial water pump is connected with the industry water house steward; The other end of blender is communicated with an end of urea weak solution control valve, and the other end of urea weak solution control valve is connected with the urea-spray unit; The urea-spray unit also is communicated with an end of atomizing steam control valve, and the other end of atomizing steam control valve is communicated with the atomizing steam house steward.
Also be communicated with solid urea storage tank lower end through the solid urea batcher in a described urea liquid preparation jar upper end, solid urea storage tank upper end is connected with the solid urea tank car through solid urea control valve, articulation, flexible pipe.
Described blender: comprise urea mouth, water pipe and combining nozzle; The big end macropore of urea mouth links to each other with the urea-spray pump discharge, and the small end outside of urea mouth is tapered, and cone-shaped internal part has aperture, and urea mouth macropore and aperture are connected; The entrance point of combining nozzle matches with the convex shoulder of urea mouth; The combining nozzle entrance point is macropore, taper hole, aperture successively outside port of export direction; Combining nozzle port of export inside have with the combining nozzle entrance point in the macropore that is connected of aperture; The inner macropore of combining nozzle entrance point is connected with an end of water pipe, and the other end of water pipe is connected with an end of pressurization industry water control valve, and the combining nozzle port of export is communicated with an end of urea weak solution control valve.
Described urea-spray unit: comprise urea spray gun, two comb plate, comb joints, two framed side wallboards, cover plate and water-cooling wall tube banks; First comb plate, comb joint, first framed side wallboard, second comb plate, comb joint, second framed side wallboard surround the cube frame; One side cover of cube frame has cover plate; The opposite side of cube frame is a side of water-cooling wall tube bank; The opposite side of water-cooling wall tube bank is a high-temperature flue gas, and every water screen tube is installed in the comb shape board slot locatees; Wherein water screen tube of water-cooling wall tube bank is crooked to cover plate circular arc, and the cover plate center has circular hole, and the urea spray gun passes cover plate center hole and water-cooling wall tube bank circular arc space.
Described two heaters adopt electrical heating or adopt Steam Heating.Described urea-spray unit is installed on 850 ~ 1150 ℃ of flue gas places of combustion apparatus.Described urea-spray unit is a unit or the parallel connection of a plurality of unit.
The beneficial effect that the utlity model has is:
Possessing under the condition of canned urea; Can realize the full-automatic continuous-feeding of canned urea; And the concentration and the uniformity of assurance urea liquid, regulate the urea flow automatically according to combustion apparatus NOx discharge capacity, make combustion apparatus NOx discharge capacity in control range; Denitration effect and effectively prevents the corrosion of water-cooling wall about 60%.Under the condition of packed urea supply, directly packed urea orcible entry is dropped into urea liquid preparation jar by manual work, urea production adopts the intermitten service mode, and all the other are identical with the mode that possesses canned urea.
Description of drawings
Fig. 1 is that the SNCR urea system of the utility model is arranged sketch map.
Fig. 2 is the blender front view of the utility model.
Fig. 3 is the A-A cutaway view that the SNCR urea system of the utility model is arranged sketch map.
Among the figure: 1, solid urea tank car, 2, flexible pipe, 3, articulation, 4, the solid urea control valve, 5, the solid urea storage tank, 6, the solid urea batcher; 7, pneumatic manifold, 8, compressed air regulating valve, 9, agitator, 10, urea liquid preparation jar, 11, heater, 12, the industry water house steward; 13, industry water control valve, 14, the urea delivery pump, 15, the urea liquid holding vessel, 16, the urea-spray pump, 17, blender; 18, urea return valve, 19, pressurization industry water control valve, 20, industrial water pump, 21, urea weak solution control valve, 22, the atomizing steam control valve; 23, atomizing steam house steward, 24, the urea-spray unit, 25, the urea mouth, 26, water pipe, 27, combining nozzle; 28, urea spray gun, 29, comb plate, comb joint, 30, framed side wallboard, 31, cover plate, 32, the water-cooling wall tube bank.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Like Fig. 1, Fig. 2, shown in Figure 3, the utility model comprises agitator 9, urea liquid preparation jar 10, heater 11, industry water house steward 12, industry water control valve 13, urea delivery pump 14, urea liquid holding vessel 15, urea-spray pump 16, blender 17, urea return valve 18, pressurization industry water control valve 19, industrial water pump 20, urea weak solution control valve 21, atomizing steam control valve 22, atomizing steam house steward 23, urea-spray unit 24.Urea liquid preparation jar 10 tops are connected with industry water house steward 12 through industry water control valve 13 and corresponding pipeline.Urea liquid preparation jar 10 interior installing primary heaters 11 and agitator 9.Realize the connection of urea liquid preparation jar 10 and urea liquid holding vessel 15 through urea delivery pump 14 and corresponding pipeline.Secondary heater 11 is set in the urea liquid holding vessel 15.Urea-spray pump 16 inlets are connected through the bottom of pipeline with urea liquid holding vessel 15; 16 outlets of urea-spray pump link to each other with an end of blender 17 and urea return valve 18 respectively through pipeline, and the other end of urea return valve 18 is connected with the top of urea liquid holding vessel 15.The centre of blender 17 is connected through the end of pipeline with pressurization industry water control valve 19, and the other end of pressurization industry water control valve 19 is connected with industrial water pump 20 outlets, and the import of industrial water pump 20 is connected with industry water house steward 12.The other end of blender 17 is communicated with an end of urea weak solution control valve 21 through pipeline, and the other end of urea weak solution control valve 21 is connected with urea-spray unit 24.Urea-spray unit 24 also is communicated with an end of atomizing steam control valve 22 through pipeline, and the other end of atomizing steam control valve 22 is communicated with atomizing steam house steward 23.
As shown in Figure 1, if possessing under the condition of canned urea, it also comprises solid urea tank car 1, flexible pipe 2, articulation 3, solid urea control valve 4, solid urea storage tank 5, solid urea batcher 6, pneumatic manifold 7, compressed air regulating valve 8; Through flexible pipe 2, articulation 3, solid urea control valve 4 and corresponding pipeline solid urea tank car 1 and solid urea storage tank 5 are connected; Carry and to deliver to solid urea in the solid urea storage tank 5 through strength; Be connected on solid urea storage tank 5 bottoms and urea liquid preparation jar 10 tops to solid urea batcher 6 through pipeline, solid urea storage tank 5 bottoms are connected with pneumatic manifold 7 through compressed air regulating valve 8 and corresponding pipeline.
As shown in Figure 2, said blender 17: comprise urea mouth 25, water pipe 26 and combining nozzle 27; The big end macropore of urea mouth 25 links to each other with 16 outlets of urea-spray pump, and the big end outside of urea mouth 25 is a cylinder, and inside has macropore, and the small end outside of urea mouth 25 is tapered, and cone-shaped internal part has aperture, and urea mouth 25 macropores and aperture are connected; The entrance point of combining nozzle 27 matches with the convex shoulder of urea mouth 25; Combining nozzle 27 outsides are cylinder; Combining nozzle 27 entrance points are macropore, taper hole, aperture successively outside port of export direction; Combining nozzle 27 port of export inside have with combining nozzle 27 entrance points in the macropore that is connected of aperture; The inner macropore of combining nozzle 27 entrance points is connected with an end of water pipe 26, and the other end of water pipe 26 is connected with an end of pressurization industry water control valve (19), and combining nozzle 27 ports of export are communicated with an end of urea weak solution control valve 21.
Like Fig. 1, shown in Figure 3, described urea-spray unit 24: comprise urea spray gun 28, two comb plate, comb joints 29, two framed side wallboards 30, cover plate 31 and water-cooling wall tube banks 32; First comb plate, comb joint 29, first framed side wallboard 30, second comb plate, comb joint 29, second framed side wallboard 30 surround the cube frame; One side cover of cube frame has cover plate 31; The opposite side of cube frame is a side of water-cooling wall tube bank 32; The opposite side of water-cooling wall tube bank 32 is high-temperature flue gas, and every water screen tube is installed in the comb shape board slot locatees; Water-cooling wall tube bank 32 wherein one crooked to cover plate 31 circular arcs, cover plate 31 centers have circular hole, urea spray gun 28 passes the cover plate center hole and water-cooling wall is restrained 32 circular arc spaces.
Described two heaters 11 adopt electrical heating or adopt Steam Heating.Described urea-spray unit 24 is installed on 850 ~ 1150 ℃ of flue gas places of combustion apparatus.Described urea-spray unit 24 is a unit or the parallel connection of a plurality of unit.
The course of work of the utility model is following:
One, possessing under the condition of canned urea:
Can be delivered to solid urea storage tank 5 to canned urea through strength; Realize the even continuously metering feed of solid urea through solid urea batcher 6; And adopt compressed air can guarantee the reliability of solid urea particle feed, avoid urea owing to the long-pending piece of the moisture absorption causes feed to stop up.Because urea dissolving in water needs heat absorption, thus urea liquid preparation jar 10 configuration heaters 11, control its temperature about 50 ℃, configuration agitator 9 can quicken the urea dissolving.It is subsequent use that the urea liquid for preparing is got to urea liquid holding vessel 15 through urea delivery pump 14, and liquid level and the urea concentration that can keep urea liquid preparation jar 10 through adjusting industry water control valve 13 apertures and solid urea batcher 6 feeding coals are constant.Urea liquid holding vessel 15 is equipped with heater 11, to keep temperature-resistant.Adopt urea-spray pump 16, industrial water pump 20 and 17 pairs of urea liquids of blender to dilute; Generally speaking; Guarantee that through pressurization industry water control valve the pressure before the blender 17 is constant; Discharge capacity according to combustion apparatus NOx is regulated urea weak solution concentration through urea return valve 18, guarantees that NOx is emitted in the control range.The combining nozzle import of blender 17 is punctured into aperture gradually by macropore, reduces the pressure of mixing point on the one hand through throttling, helps enlarging the pressure adjustable range of urea liquid, helps urea liquid on the other hand and mixes with the even of industry water.The urea-spray unit comprises urea spray gun 28, comb plate, comb joint 29, framed side wallboard 30, cover plate 31, water-cooling wall tube bank 32; Form urea spray gun fixed support by comb plate, comb joint 29, framed side wallboard 30, cover plate 31, water-cooling wall tube bank 32; Guarantee the spray gun geometric position, avoid urea to be sprayed onto water screen tube and cause its corrosion.Adopt atomizing steam that the urea weak solution is atomized, accomplish that the thickness particle arranges in pairs or groups on request, improve the mixed effect of urea weak solution and flue gas.Technology more than adopting can realize the full-automatic operation continuously of SNCR system, and assurance denitration rate is effectively avoided the corrosion of water-cooling wall about 60%.
Two, under the condition of packed urea supply:
Cancellation solid urea tank car 1, flexible pipe 2, articulation 3, solid urea control valve 4, solid urea storage tank 5, solid urea batcher 6, pneumatic manifold 7, compressed air regulating valve 8; Directly packed urea orcible entry is dropped into urea liquid preparation jar 10 by manual work; Urea production adopts the intermitten service mode, promptly at first regulates and keep the temperature and the liquid level of urea liquid preparation jar 10, calculates industry water weight according to liquid level gauge; By the artificial urea that drops into corresponding weight of concentration requirement; Start agitator 8 then and move certain hour, at last urea liquid is got to urea liquid holding vessel 15 through urea delivery pump 14, other is identical with the condition that possesses canned urea.
The above-mentioned specific embodiment is used for the utility model of explaining; Rather than the utility model limited; In the protection domain of the spirit of the utility model and claim,, all fall into the protection domain of the utility model to any modification and the change that the utility model is made.
Claims (7)
1. one kind is the SNCR equipment for denitrifying flue gas of reducing agent with urea, it is characterized in that: comprise the preparation of agitator (9), urea liquid jar (10), a heater (11), industry water house steward (12), industry water control valve (13), urea delivery pump (14), urea liquid holding vessel (15), urea-spray pump (16), blender (17), urea return valve (18), pressurization industry water control valve (19), industrial water pump (20), urea weak solution control valve (21), atomizing steam control valve (22), atomizing steam house steward (23) and urea-spray unit (24); Urea liquid preparation jar (10) top is connected through industry water control valve (13) and industry water house steward (12); Be equiped with primary heater and agitator (9) in the urea liquid preparation jar (10), make the connection of urea liquid preparation jar (10) and urea liquid holding vessel (15) through urea delivery pump (14); The urea liquid holding vessel is provided with secondary heater in (15); Urea-spray pump (16) inlet is connected with the bottom of urea liquid holding vessel (15); Urea-spray pump (16) outlet links to each other with the end of blender (17) with urea return valve (18) respectively, and the other end of urea return valve (18) is connected with the top of urea liquid holding vessel (15); The centre of blender (17) is connected with an end of pressurization industry water control valve (19), and the other end of pressurization industry water control valve (19) is connected with industrial water pump (20) outlet, and the import of industrial water pump (20) is connected with industry water house steward (12); The other end of blender (17) is communicated with an end of urea weak solution control valve (21), and the other end of urea weak solution control valve (21) is connected with urea-spray unit (24); Urea-spray unit (24) also is communicated with an end of atomizing steam control valve (22), and the other end of atomizing steam control valve (22) is communicated with atomizing steam house steward (23).
2. according to claim 1 a kind of be the SNCR equipment for denitrifying flue gas of reducing agent with urea; It is characterized in that: also be communicated with solid urea storage tank (5) lower end through solid urea batcher (6) in described urea liquid preparation jar (a 10) upper end, solid urea storage tank (5) upper end is connected with solid urea tank car (1) through solid urea control valve (4), articulation (3), flexible pipe (2).
3. according to claim 1 a kind of be the SNCR equipment for denitrifying flue gas of reducing agent with urea, it is characterized in that: described blender (17) comprises urea mouth (25), water pipe (26) and combining nozzle (27); The big end macropore of urea mouth (25) links to each other with urea-spray pump (16) outlet, and the small end outside of urea mouth (25) is tapered, and cone-shaped internal part has aperture, and urea mouth (25) macropore and aperture are connected; The entrance point of combining nozzle (27) matches with the convex shoulder of urea mouth (25); Combining nozzle (27) entrance point is macropore, taper hole, aperture successively outside port of export direction; Combining nozzle (27) port of export inside has the macropore that is connected with the interior aperture of combining nozzle (27) entrance point; The inner macropore of combining nozzle (27) entrance point is connected with an end of water pipe (26); The other end of water pipe (26) is connected with an end of pressurization industry water control valve (19), and combining nozzle (27) port of export is communicated with an end of urea weak solution control valve (21).
4. according to claim 1 a kind of be the SNCR equipment for denitrifying flue gas of reducing agent with urea, it is characterized in that: described urea-spray unit (24) comprises urea spray gun, two comb plate, comb joints, two framed side wallboards, cover plate (31) and water-cooling walls tube banks (32); First comb plate, comb joint, first framed side wallboard, second comb plate, comb joint, second framed side wallboard surround the cube frame; One side cover of cube frame has cover plate (31); The opposite side of cube frame is a side of water-cooling wall tube bank (32); The opposite side of water-cooling wall tube bank (32) is a high-temperature flue gas, and every water screen tube is installed in the comb shape board slot locatees; Wherein water screen tube of water-cooling wall tube bank (32) is crooked to cover plate (31) circular arc, and cover plate (31) center has circular hole, and urea spray gun (28) passes cover plate center hole and water-cooling wall tube bank (32) circular arc space.
5. according to claim 1 a kind of be the SNCR equipment for denitrifying flue gas of reducing agent with urea, it is characterized in that: described two heaters adopt electrical heating or adopt Steam Heating.
6. according to claim 1 a kind of be the SNCR equipment for denitrifying flue gas of reducing agent with urea, it is characterized in that: described urea-spray unit (24) is installed on 850 ~ 1150 ℃ of flue gas places of combustion apparatus.
7. according to claim 1 a kind of be the SNCR equipment for denitrifying flue gas of reducing agent with urea, it is characterized in that: described urea-spray unit (24) is the parallel connection of a unit or a plurality of unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120294665XU CN202237748U (en) | 2011-08-15 | 2011-08-15 | SNCR (selective non catalytic reduction) flue gas denitration device taking carbamide as reducing agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120294665XU CN202237748U (en) | 2011-08-15 | 2011-08-15 | SNCR (selective non catalytic reduction) flue gas denitration device taking carbamide as reducing agent |
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| Publication Number | Publication Date |
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| CN202237748U true CN202237748U (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120294665XU Withdrawn - After Issue CN202237748U (en) | 2011-08-15 | 2011-08-15 | SNCR (selective non catalytic reduction) flue gas denitration device taking carbamide as reducing agent |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102274687A (en) * | 2011-08-15 | 2011-12-14 | 浙江大学 | SNCR (Selective Non-Catalytic Reduction) flue gas denitration device taking urea as reducting agent |
| CN102824841A (en) * | 2012-08-21 | 2012-12-19 | 杨建华 | Selective non-catalytic reduction (SNCR) denitration system of coal-fired circulating fluidized bed boiler |
| CN102921284A (en) * | 2012-10-11 | 2013-02-13 | 浙江省环境保护科学设计研究院 | Method and device for controlling NOx concentration in smoke gas of cement kiln |
| CN104524949A (en) * | 2015-01-07 | 2015-04-22 | 东莞市红树林环保科技有限公司 | SNCR denitration method for urea solutions of double concentrations |
| CN106292270A (en) * | 2016-09-09 | 2017-01-04 | 淮南矿业(集团)有限责任公司 | A kind of CFBB denitration automaton and method thereof |
-
2011
- 2011-08-15 CN CN201120294665XU patent/CN202237748U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102274687A (en) * | 2011-08-15 | 2011-12-14 | 浙江大学 | SNCR (Selective Non-Catalytic Reduction) flue gas denitration device taking urea as reducting agent |
| CN102824841A (en) * | 2012-08-21 | 2012-12-19 | 杨建华 | Selective non-catalytic reduction (SNCR) denitration system of coal-fired circulating fluidized bed boiler |
| CN102824841B (en) * | 2012-08-21 | 2015-04-29 | 郑州电力高等专科学校 | Selective non-catalytic reduction (SNCR) denitration system of coal-fired circulating fluidized bed boiler |
| CN102921284A (en) * | 2012-10-11 | 2013-02-13 | 浙江省环境保护科学设计研究院 | Method and device for controlling NOx concentration in smoke gas of cement kiln |
| CN102921284B (en) * | 2012-10-11 | 2014-10-08 | 浙江省环境保护科学设计研究院 | Method and device for controlling NOx concentration in smoke gas of cement kiln |
| CN104524949A (en) * | 2015-01-07 | 2015-04-22 | 东莞市红树林环保科技有限公司 | SNCR denitration method for urea solutions of double concentrations |
| CN106292270A (en) * | 2016-09-09 | 2017-01-04 | 淮南矿业(集团)有限责任公司 | A kind of CFBB denitration automaton and method thereof |
| CN106292270B (en) * | 2016-09-09 | 2019-03-19 | 淮南矿业(集团)有限责任公司 | A kind of circulating fluidized bed boiler denitration automatic control device and its method |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20120530 Effective date of abandoning: 20130522 |
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| RGAV | Abandon patent right to avoid regrant |