CN201978740U - Urea solution hydrolytic ammonia preparing kettle type reactor - Google Patents
Urea solution hydrolytic ammonia preparing kettle type reactor Download PDFInfo
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- CN201978740U CN201978740U CN2011200464898U CN201120046489U CN201978740U CN 201978740 U CN201978740 U CN 201978740U CN 2011200464898 U CN2011200464898 U CN 2011200464898U CN 201120046489 U CN201120046489 U CN 201120046489U CN 201978740 U CN201978740 U CN 201978740U
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Abstract
The utility model discloses a urea solution hydrolytic ammonia preparing kettle type reactor which mainly consists of a horizontal long cylinder type reaction kettle, a plurality of U-shaped heat exchanging coil pipes arranged at the inner part of the horizontal long cylinder type reaction kettle, a product gas outlet pipe and a urea solution injecting port, wherein the product gas outlet pipe and the urea solution injecting port are arranged on the outer wall of the horizontal long cylinder type reaction kettle. The reactor adopts a kettle type cylindrical structure; with the adoption of such structure, the reacting quantity of solution at the inner part of the reactor can be quickly reduced, the escaping degree of ammonia in the denitration process can be effectively lowered and the safety performance of a subsequent smoke denitration (denitrification) device can be improved. Moreover, as the reaction adopts the kettle type structure, more U-shaped heat exchanging coil pipes and reactor solution can be contained and more ammonia gas can be generated through reaction. The U-shaped heat exchanging coil pipes are completely soaked in heat-transferred liquid, so that the liquid at the cold side carries out self-circulation from bottom to top at the inner part after being heated, the heating is uniform, the coefficient of heat transfer is large and the urea ammonia preparing reaction efficiency is high. The reactor meets the characteristics that a smoke denitration system needs a large quantity of ammonia and great changes take place in loads of the ammonia.
Description
Technical field
The utility model relates to a kind of denitrating flue gas (nitrogen) device, specifically is meant urea liquid hydrolysis system ammonia tank reactor.
Background technology
The present generating set overwhelming majority of China is coal-fired unit.A large amount of coal burnings can discharge a large amount of atmosphere pollution-nitrogen oxide.Remove nitrogen oxide and generally adopt selective catalytic reduction (being SCR).
Selective catalytic reduction is meant under the effect of catalyst, with NH
3Be reducing agent, with nontoxic, the free of contamination N of reaction of nitrogen oxides generation in the flue gas
2And H
2O.Can produce denitrification reducing agent NH
3Material three kinds in liquefied ammonia, ammoniacal liquor and urea is arranged.
Liquefied ammonia has another name called anhydrous ammonia, is hazardous chemical.Liquefied ammonia leaks in the air, forms cloud with airborne water, is difficult for diffusion, and near people personal safety is worked the mischief.The explosion limit of ammonia steam and air mixture is 15.7% ~ 27.4%, and ammonia and air mixture reach above-mentioned concentration range chance naked light and can burn and explode, and exist if any oils and other inflammable substances, and then danger is higher.Ammoniacal liquor also belongs to dangerous material, and the ammonia concn that is used for denitration is generally 20% ~ 29%, and ammoniacal liquor is comparatively safe than liquefied ammonia, has explosion danger too but airborne ammonia reaches above-mentioned explosion limit.Therefore liquefied ammonia and ammoniacal liquor have strict provisions of laws and regulations in country aspect storage, transportation and the use.
With respect to liquefied ammonia and ammoniacal liquor, urea is nontoxic, harmless chemicals, is convenient to transportation and storage, available train or automobile transportation, and transportation and storage process do not need special safety measure.Urea allows environmental friendliness as denitrification reducing agent, causes danger in the time of can avoiding leaking in storage, conveying and use.Therefore, increasing thermal power plant wishes to use urea as denitrification reducing agent.
The total emission volumn of thermal power plant's nitrogen oxide will be estimated to be increased to 1,200 ten thousand tons by 1,050 ten thousand tons in 2010 during " 12 ", the Eleventh Five-Year Plan period China has formulated thermal power plant's nitrogen oxide control technology policy, strengthened the control to thermoelectricity industry discharged nitrous oxides, discharge standard is strict more.Power plants nitrogen oxide in 2010 reduces discharging total amount and is about 300 tons, is 2015 to " 12 " end, estimates that thermal power plant's nitrogen oxide CER will reach 5,000,000 tons, account for 40% of whole thermal power plant discharged nitrous oxides total amount.During " 12 ", China's thermoelectricity denitration industry development process will significantly be accelerated, and the market of denitrification reducing agent also will continue to increase." thermal power plant's nitrogen oxide Prevention Technique policy ", " coal steam-electric plant smoke denitration engineering legislation " are all to using the urea technique for production of ammonia as done clearly regulation for the ammonia new technology.
The utility model content
Technical problem to be solved in the utility model provides a kind of denitrating flue gas equipment of big load, it is nitrogen urea liquid hydrolysis system ammonia reactor, this kind consersion unit can be with aqueous solution of urea under the effect of thermal source, quick a large amount of cleaning flue gases denitration (nitrogen) reducing agent-ammonia of output; And can be along with the variation of need ammonia amount the rapid adjustment amonia yield, thereby reduce the escaping of ammonia of denitrating system.
The technical scheme in the invention for solving the above technical problem is: urea liquid hydrolysis system ammonia tank reactor, and mainly by horizontal long cartridge type reactor and be arranged on some U type heat exchange coils of horizontal long cartridge type reactor inside and the product gas outlet pipe and the urea solution jet charging aperture that are arranged on the horizontal long cartridge type reactor outer wall constitute.
Mainly the reactor cylindrical shell end socket at the cylindrical shell two ends constitutes described horizontal long cartridge type reactor by cylindrical shell and sealing and fixing.
Described reactor cylindrical shell end socket adds the heavy caliber pipe by end socket and is connected with the heat medium in-out apparatus.
Described U type heat exchange coil connects reactor cylindrical shell end socket and extends to end socket and adds heavy caliber pipe inside, and described U type heat exchange coil is connected with the heat medium in-out apparatus.
Described heat medium in-out apparatus is a large diameter pipeline, its inside is divided into two parts up and down by dividing plate, described two parts up and down are respectively arranged with heat medium inlet tube, thermal medium condensation discharge pipe, and described two parts up and down also are connected with the import and export two ends of U type heat exchange coil respectively.
Be provided with gas-liquid separator in the described product gas outlet pipe, and described product gas outlet pipe also is provided with seal cover away from an end of horizontal long cartridge type reactor, described seal cover offers product gas outlet.
Described urea solution jet charging aperture is provided with feed distributor, and described feed distributor is the channel-section steel that offers some through holes, the described through hole formation dispensing orifice that evenly distributes.The channel-section steel closed at both ends, the fluting direction is connected with the sealing of urea solution jet charging aperture, the diameter of its dispensing orifice is 10 ~ 15mm, for urea liquid is evenly distributed on the whole U type heat exchange coil tube bank length, the width of described feed distributor is not less than 1.5 times of urea solution jet charging aperture mouth diameter, and the perforate sectional area summation of feed distributor is slightly larger than the sectional area of entrance sleeve.
Described reactor cylindrical shell end socket outer wall also is provided with the gas phase temperature meter, spies on the border, liquid thermometer.
Described cylinder body outer wall also is provided with solution outlet, relief valve connection device, teletransmission Pressure gauge, Pressure gauge, radar level gauge and saddle on the spot.
Described urea liquid hydrolysis system ammonia reactor integral body is horizontal columnar structured.The heat medium in-out apparatus is heat medium turnover district; End socket adds the heavy caliber pipe and adds the reactor cylindrical shell end socket formation heat medium coil pipe bonding pad that the heavy caliber pipe is connected with end socket; Cylindrical shell is a hydrolysis reaction zone.Change and maintenance for making things convenient for heat exchange pipeline to extract out, heat medium coil pipe bonding pad adopts flange to be connected with heat medium turnover district.
Urea is produced denitration (nitrogen) reducing agent, two kinds of methods is arranged usually: pyrolysis and hydrolysis.Pyrolysismethod is that the urea liquid after the direct Fast Heating atomizing decomposes, and decomposes not exclusively but pyrolysismethod is frequent, influences the efficient of denitrating flue gas (nitrogen).Hydrolyze method is in the certain reaction facility, and aqueous solution of urea is decomposed under the effect of thermal source, and to produce denitrating flue gas (nitrogen) reducing agent, this facility is a urea liquid hydrolysis system ammonia tank reactor.
U type heat exchange coil tube bank in the described hydrolysis reaction zone is dipped in the urea liquid, and urea liquid goes out CO at the interbank pyrohydrolysis that is subjected to of U type heat exchange coil
2And NH
3, the CO that the urea liquid that is heated simultaneously produces together with hydrolysis
2And NH
3Together move upward, gas breaks away from liquid level liquid and then loops back the bottom from U type heat exchange coil tube bank both sides, forms uneven shuttling movement on the space.
Because this self-loopa is arranged, hydrolysis of urea system ammonia reactor can not install agitator additional in addition in the urea liquid hydrolysis system ammonia tank reactor, the possibility that can reduce investment outlay and also avoid agitator sealing place to leak.According to the difference that denitrating flue gas needs ammonia to load, U type heat exchange coil tube pitch is 1 ~ 2 times of U type heat exchange coil external diameter.Liquid level exceeds 50 ~ 100mm than heating tube bundle upper surface in the urea liquid hydrolysis system ammonia tank reactor.Steady for the assurance course of reaction under the continued operation condition, will there be enough separated spaces the liquid level top, enough urea liquid volumes also to be arranged as buffering in the urea liquid hydrolysis system ammonia tank reactor, the center line of U type heat exchange coil tube bank head tube to the distance at cylindrical shell top is not less than 40% of barrel diameter, and the free space height at urea liquid liquid level top to cylindrical shell top is not less than 0.25m.
The beneficial effects of the utility model are.
1, maintenance and cleaning are convenient.
The utility model adopts tank reactor, and the U type heat exchange coil in the urea liquid hydrolysis system ammonia tank reactor can conveniently be extracted out and clean and change.U type heat exchange coil is extracted out and is also made things convenient for cleaning reaction device inside.
2, heat transfer area is big, the reaction efficiency height.
The utility model adopts tank reactor, and U type heat exchange coil is soaked in fully by in the heat transfer liquids, cold side heated liquid inside carrying out from down to up self-loopa, be heated evenly, heat transfer coefficient is big, urea system ammoniacal liquor is separated the reaction efficiency height.
3, the reaction load is big, and operating flexibility is big.
The tank reactor that the utility model adopts more can satisfy big, the big characteristics of need ammonia load variations of flue gas denitrification system need ammonia amount than vertical reactor.Tank reactor of the present utility model under the long-pending situation of equivalent responses body can hold more heat exchange coil and reactor solution, can reflect more ammonia.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is a cutaway view of the present utility model.
Fig. 3 is the structural representation of the utility model feed distributor.
Label among the figure is expressed as respectively: 1, heat medium in-out apparatus; 2, end socket adds the heavy caliber pipe; 3, horizontal long cartridge type reactor; 4, product gas outlet pipe; 5, reactor cylindrical shell end socket; 6, feed distributor; 7, product gas; 8, liquid; 11, heat medium inlet tube; 12, thermal medium condensation discharge pipe; 31, U type heat exchange coil; 32, solution outlet; 33, urea solution jet charging aperture; 34, relief valve connection device; 35, teletransmission Pressure gauge; 36, Pressure gauge on the spot; 37, radar level gauge; 38, saddle; 41, gas-liquid separator; 42, product gas outlet; 51, gas phase temperature meter; 52, spy on the border; 53, liquid thermometer.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.
Present embodiment is referring to shown in Fig. 1,2, and urea liquid hydrolysis system ammonia tank reactor is mainly by horizontal long cartridge type reactor 3 and be arranged on some U type heat exchange coils 31 of horizontal long cartridge type reactor 3 inside and the product gas outlet pipe 4 and the urea solution jet charging aperture 33 that are arranged on horizontal long cartridge type reactor 3 outer walls constitute.
By urea solution jet charging aperture 33 urea liquid is sprayed the inner barrel that enters into the horizontal long cartridge type reactor 3 of reactor through the effect of feed distributor 6.Thermal medium by in the U type heat exchange coil 31 carries out heat exchange, and urea liquid is heated, and is hydrolyzed.The product gas 7 that obtains, liquid 8 is separated in 41 effects through gas-liquid separator.Product gas 7 is discharged from through product gas outlet 42.Liquid 8 continues to get back to and participates in hydrolysis in the urea liquid.
Mainly the reactor cylindrical shell end socket 5 at the cylindrical shell two ends constitutes horizontal long cartridge type reactor 3 by cylindrical shell and sealing and fixing.Reactor cylindrical shell end socket 5 adds heavy caliber pipe 2 by end socket and is connected with heat medium in-out apparatus 1.U type heat exchange coil 31 connects reactor cylindrical shell end socket 5 again and extends to end socket and adds heavy caliber pipe 2 inside, and U type heat exchange coil 31 is connected with heat medium in-out apparatus 1.Heat medium forms a thermal source return-flow system by heat medium in-out apparatus 1, U type heat exchange coil.
Heat medium in-out apparatus 1 is a large diameter pipeline, its inside is divided into two parts up and down by dividing plate, two parts are respectively arranged with heat medium inlet tube 11, thermal medium condensation discharge pipe 12 up and down, and two parts also are connected with the import and export two ends of U type heat exchange coil 31 respectively up and down.
Be provided with gas-liquid separator 41 in the product gas outlet pipe 4, and product gas outlet pipe 4 also is provided with seal cover away from an end of horizontal long cartridge type reactor 3, described seal cover offers product gas outlet 42.
Reactor cylindrical shell end socket 5 outer walls also are provided with gas phase temperature meter 51, spy on border 52, liquid thermometer 53.
Cylinder body outer wall also is provided with solution outlet 32, relief valve connection device 34, teletransmission Pressure gauge 35, Pressure gauge 36, radar level gauge 37 on the spot.Whole facility is provided with two saddles 38 and is used for supporting.
Shown in Fig. 2,3, urea solution jet charging aperture 33 is provided with feed distributor 6, and described feed distributor 6 is for offering the channel-section steel of some through holes, the through hole formation dispensing orifice that evenly distributes.The width of feed distributor 6 is 1.5 times of 33 mouthfuls of diameters of urea solution jet charging aperture.
As mentioned above, just can realize the utility model preferably.
Claims (10)
1. urea liquid hydrolysis system ammonia tank reactor, it is characterized in that, mainly by horizontal long cartridge type reactor (3) and be arranged on the inner some U type heat exchange coils (31) of horizontal long cartridge type reactor (3) and be arranged on product gas outlet pipe (4) and urea solution jet charging aperture (33) formation on horizontal long cartridge type reactor (3) outer wall.
2. urea liquid hydrolysis system ammonia tank reactor according to claim 1 is characterized in that, mainly the reactor cylindrical shell end socket (5) at the cylindrical shell two ends constitutes described horizontal long cartridge type reactor (3) by cylindrical shell and sealing and fixing.
3. urea liquid hydrolysis system ammonia tank reactor according to claim 2 is characterized in that, described reactor cylindrical shell end socket (5) adds heavy caliber pipe (2) by end socket and is connected with heat medium in-out apparatus (1).
4. urea liquid hydrolysis system ammonia tank reactor according to claim 3, it is characterized in that, described U type heat exchange coil (31) connects reactor cylindrical shell end socket (5) and extends to end socket and adds heavy caliber pipe (2) inside, and described U type heat exchange coil (31) is connected with heat medium in-out apparatus (1).
5. urea liquid hydrolysis system ammonia tank reactor according to claim 4, it is characterized in that, described heat medium in-out apparatus (1) is a large diameter pipeline, its inside is divided into two parts up and down by dividing plate, described two parts up and down are respectively arranged with heat medium inlet tube (11), thermal medium condensation discharge pipe (12), and described two parts up and down also are connected with the import and export two ends of U type heat exchange coil (31) respectively.
6. urea liquid hydrolysis system ammonia tank reactor according to claim 1, it is characterized in that, be provided with gas-liquid separator (41) in the described product gas outlet pipe (4), and described product gas outlet pipe (4) also is provided with seal cover away from an end of horizontal long cartridge type reactor (3), and described seal cover offers product gas outlet (42).
7. urea liquid hydrolysis system ammonia tank reactor according to claim 1, it is characterized in that, described urea solution jet charging aperture (33) is provided with feed distributor (6), and described feed distributor (6) is for offering the channel-section steel of some through holes, the described through hole formation dispensing orifice that evenly distributes.
8. urea liquid hydrolysis system ammonia tank reactor according to claim 7 is characterized in that, the width of described feed distributor (6) is more than or equal to 1.5 times of urea solution jet charging aperture (33) mouthful diameter.
9. according to any described urea liquid hydrolysis system ammonia tank reactor among the claim 2-5, it is characterized in that described reactor cylindrical shell end socket (5) outer wall also is provided with gas phase temperature meter (51), spies on border (52), liquid thermometer (53).
10. according to any described urea liquid hydrolysis system ammonia tank reactor among the claim 2-5, it is characterized in that described cylinder body outer wall also is provided with solution outlet (32), relief valve connection device (34), teletransmission Pressure gauge (35), Pressure gauge (36), radar level gauge (37) and saddle (38) on the spot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200464898U CN201978740U (en) | 2011-02-24 | 2011-02-24 | Urea solution hydrolytic ammonia preparing kettle type reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200464898U CN201978740U (en) | 2011-02-24 | 2011-02-24 | Urea solution hydrolytic ammonia preparing kettle type reactor |
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| Publication Number | Publication Date |
|---|---|
| CN201978740U true CN201978740U (en) | 2011-09-21 |
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|---|---|---|---|
| CN2011200464898U Ceased CN201978740U (en) | 2011-02-24 | 2011-02-24 | Urea solution hydrolytic ammonia preparing kettle type reactor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102631879A (en) * | 2012-05-07 | 2012-08-15 | 中国电力工程顾问集团华北电力设计院工程有限公司 | Flue gas denitrification steady flow type urea hydrolysis ammonia reactor |
| CN102921369A (en) * | 2012-11-28 | 2013-02-13 | 宁夏宝塔石化集团有限公司 | Novel alkylation stirring reactor of horizontal type built-in heat exchanging pipe |
| CN105665343A (en) * | 2016-03-10 | 2016-06-15 | 北京新叶能源科技有限公司 | Online cleaning device and method for urea catalytic hydrolysis reaction device |
| CN105948075A (en) * | 2016-04-29 | 2016-09-21 | 中国计量大学 | Kettle type urea-based ammonia preparation system used for SCR denitrification |
| CN106669580A (en) * | 2017-03-06 | 2017-05-17 | 广西防城港市明良长富石化科技有限公司 | Reaction device for industrial synthetic gypsum |
| CN110422860A (en) * | 2019-07-16 | 2019-11-08 | 中国华电科工集团有限公司 | A kind of hydrolysis of urea ammonia reaction unit |
| CN110436480A (en) * | 2019-08-14 | 2019-11-12 | 中国华电科工集团有限公司 | A kind of circulation disturbance urea hydrolysis device and operating method |
| CN111215010A (en) * | 2020-02-27 | 2020-06-02 | 东方电气集团东方锅炉股份有限公司 | Urea hydrolysis reactor utilizing hydrophobic waste heat and urea hydrolysis method thereof |
| CN114715915A (en) * | 2022-05-09 | 2022-07-08 | 北京新叶科技有限公司 | Novel urea catalytic hydrolysis method and device |
-
2011
- 2011-02-24 CN CN2011200464898U patent/CN201978740U/en not_active Ceased
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102631879A (en) * | 2012-05-07 | 2012-08-15 | 中国电力工程顾问集团华北电力设计院工程有限公司 | Flue gas denitrification steady flow type urea hydrolysis ammonia reactor |
| CN102921369A (en) * | 2012-11-28 | 2013-02-13 | 宁夏宝塔石化集团有限公司 | Novel alkylation stirring reactor of horizontal type built-in heat exchanging pipe |
| CN105665343A (en) * | 2016-03-10 | 2016-06-15 | 北京新叶能源科技有限公司 | Online cleaning device and method for urea catalytic hydrolysis reaction device |
| CN105948075A (en) * | 2016-04-29 | 2016-09-21 | 中国计量大学 | Kettle type urea-based ammonia preparation system used for SCR denitrification |
| CN105948075B (en) * | 2016-04-29 | 2018-01-05 | 中国计量大学 | A kind of SCR denitration autoclave ammonia preparation system from urea |
| CN106669580A (en) * | 2017-03-06 | 2017-05-17 | 广西防城港市明良长富石化科技有限公司 | Reaction device for industrial synthetic gypsum |
| CN110422860A (en) * | 2019-07-16 | 2019-11-08 | 中国华电科工集团有限公司 | A kind of hydrolysis of urea ammonia reaction unit |
| CN110436480A (en) * | 2019-08-14 | 2019-11-12 | 中国华电科工集团有限公司 | A kind of circulation disturbance urea hydrolysis device and operating method |
| CN111215010A (en) * | 2020-02-27 | 2020-06-02 | 东方电气集团东方锅炉股份有限公司 | Urea hydrolysis reactor utilizing hydrophobic waste heat and urea hydrolysis method thereof |
| CN114715915A (en) * | 2022-05-09 | 2022-07-08 | 北京新叶科技有限公司 | Novel urea catalytic hydrolysis method and device |
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| GR01 | Patent grant | ||
| IW01 | Full invalidation of patent right |
Decision date of declaring invalidation: 20160601 Decision number of declaring invalidation: 29211 Granted publication date: 20110921 |