CN207085651U - Urea alcoholysis prepares denitrification reducing agent coproduction ethylene（Third）The device of alkene ester - Google Patents
Urea alcoholysis prepares denitrification reducing agent coproduction ethylene（Third）The device of alkene ester Download PDFInfo
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- CN207085651U CN207085651U CN201720810438.5U CN201720810438U CN207085651U CN 207085651 U CN207085651 U CN 207085651U CN 201720810438 U CN201720810438 U CN 201720810438U CN 207085651 U CN207085651 U CN 207085651U
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Abstract
The utility model discloses the device that a kind of urea alcoholysis prepares denitrification reducing agent coproduction ethylene (third) alkene ester, belong to flue gas in power station boiler denitration field, the product gas outlet of urea alcoholysis reaction unit connects with the entrance of condenser, the condensate outlet of condenser connects with the condensate inlet of urea alcoholysis reaction unit, the ammonia outlet of condenser is communicated to the ammonia entrance of NH3/ air mixers, NH through vavuum pump3The mixed gas outlet of/air mixer connects with the reducing agent entrance of the reducing agent injection device of selective catalytic reduction flue gas denitration system, and the liquid product of urea alcoholysis reaction unit exports is communicated to follow-up ethylene (third) alkene ester processing unit through transfer pipeline.The utility model can not only meet the needs of SCR denitration system is to reducing agent ammonia, moreover it is possible to which coproduction prepares ethylene (third) alkene ester and is used as other commercial uses, improves urea desorption column, and reaching reduces SCR denitration device operating cost purpose.
Description
Technical field
The utility model belongs to flue gas in power station boiler denitration field.
Background technology
Selective catalytic reduction flue gas denitration technique（Abbreviation SCR denitration technique）It is widely used in the flue gas of thermal power plant
The removing of nitrogen oxides.The reducing agent of SCR denitration technique mainly has three kinds of liquefied ammonia, ammoniacal liquor and urea.
Liquefied ammonia is toxic chemical（GB12268-90 provides No. 23003 dangerous poisonous substances）, toxicity and explosion hazard
Larger, vigorous combustion and blast can be occurred by meeting naked light.According to《Hazardous chemical Major Hazard Installations Identifying》（GB18218-2009）
It is hazardous chemical that middle table 1, which lists ammonia, and its critical value is defined as 10t, more than 10t, then belongs to major hazard source.Ammonia in recent years
Leakage or explosion accident take place frequently, such as on June 3rd, 2013, the A leak of liquefied ammonia blast of Dehui City of Jilin Province Bao Yuanfengqin industry Co., Ltd
Concurrently light a fire calamity, cause that 121 people are dead, 76 people are injured, direct economic loss is more than 1.8 hundred million yuan；The same year August 31 days, upper Hypon
A leak of liquefied ammonia accident occurs for mountain area father-in-law's board refrigeration Industrial Co., Ltd., causes 15 people death, 26 people injured；November 11 the same year,
Liquefied ammonia explosion accident occurs for the steel steel construction Co., Ltd of Urumqi City Xinjiang eight, causes more people's killed or woundeds, economical
Suffer heavy losses.Therefore, the use of liquefied ammonia has become increasingly limited.And ammoniacal liquor because its transport, storage safety issue with
And investment operating cost is occupied high and applied less.
According to《Thermal power plant denitrating flue gas designing technique code》DL/T 5480-2013：Positioned at big and medium-sized cities and the suburbs
The power plant in area, urea is preferably selected as reducing agent.Urea is nontoxic chemicals, is the conventional fertilizer of agricultural, no blast
Danger, used more and more by power plant.
For urea as SCR denitration reducing agent, currently used technique has urea pyrolysis ammonia and hydrolysis Ammonia Process.Its is anti-
The equation is answered to be：
CO(NH2)2 + H2O ↔ 2NH3 ↑ + CO2 ↑
As can be seen from the above equation, urea is used for SCR denitration work with water reaction generation ammonia and carbon dioxide, ammonia
Skill, carbon dioxide are finally exhausted to air after denitration flue.Calculated according to reactivity 100%, then 1kg urea is most lifelong
Into about 0.57kg ammonias and 0.73kg carbon dioxide, for urea desorption column less than 50%, operating cost is higher, and economy is poor.
Utility model content
The purpose of this utility model is：It is proposed that a kind of urea alcoholysis prepares denitrification reducing agent coproduction ethylene carbonate or carbon
The device of acid propylene ester, can not only meet the needs of SCR denitration system is to reducing agent ammonia, moreover it is possible to coproduction prepare ethylene carbonate or
Propene carbonate is used as other commercial uses, improves urea desorption column, and reaching reduces SCR denitration device operating cost purpose.
The purpose of this utility model is realized by following technical proposals：
A kind of urea alcoholysis prepares the device of denitrification reducing agent coproduction ethylene carbonate or propene carbonate, including urea alcohol
Solve reaction unit, circulating pump, heater, condenser, vavuum pump, NH3/ air mixer and reducing agent injection device, urea
The product gas outlet of alcoholysis reaction device connects with the entrance of condenser, and condensate outlet and the urea alcoholysis of condenser react
The condensate inlet connection of device, the ammonia outlet of condenser are communicated to NH through vavuum pump3The ammonia entrance of/air mixer,
NH3The reduction of the mixed gas outlet of/air mixer and the reducing agent injection device of selective catalytic reduction flue gas denitration system
Agent entrance connects, and urea alcoholysis reaction unit is provided with liquid product outlet, liquid product loop exit and liquid product and is recycled into
Mouthful, liquid product outlet is communicated to follow-up ethylene carbonate or propene carbonate processing unit through transfer pipeline, and liquid product follows
Ring exports sets circulating pump and heater between liquid product loop head.
Alternatively, in addition to ammonia surge tank and flow regulator, the ammonia outlet of condenser connect through vavuum pump
To ammonia surge tank entrance, the outlet of ammonia surge tank is communicated to NH through flow regulator3The ammonia entrance of/air mixer.
As further selection, flow regulator is Flow-rate adjustment valve group.In the program, ammonia surge tank is through ammonia flow regulating valve
Group adjusts appropriate ammonia（Matched with boiler load）Into ammonia/air mixer.NH3/ air mixer is to by reducing agent
Ammonia and air are sufficiently mixed and by reducing agent NH3The safe concentration being diluted to（Such as less than 5%）.
Alternatively, heater is reboiler or circulation heat exchanger.In the program, the material of urea alcoholysis reaction unit
Heated with circulating pump forced circulation to reboiler or circulation heat exchanger（Such as 160 1 180 DEG C of heating-up temperature of control）Afterwards, then
Return to urea alcoholysis reaction unit.
Alternatively, the reducing agent injection device of selective catalytic reduction flue gas denitration system is located at Denitration in Boiler flue
It is interior.As further selection, static mixing device is additionally provided with after reducing agent injection device.In the program, denitrification reducing agent note
Injection device by denitrification reducing agent being evenly injected into denitration gas approach.Static mixing device is to by denitrification reducing agent ammonia
It is well mixed with flue gas before SCR denitration reactor is entered.
The foregoing main scheme of the utility model and its each further selection scheme can be with independent assortments to form multiple schemes,
The scheme that can be used and be claimed for the utility model；And the utility model,（Each non conflicting selection）Between selection and
Can also independent assortment between other selections.Those skilled in the art are after the present invention program is understood according to prior art and public affairs
Know that general knowledge can understand there are multiple combinations, be the claimed technical scheme of the utility model, do not do exhaustion herein.
Workflow of the present utility model：The utility model provides a kind of denitrification reducing agent urea alcoholysis and prepares co-production carbon
The device of vinyl acetate or propene carbonate, i.e., by urea and second（Third）Glycol is sent into urea alcoholysis reaction unit, is being catalyzed
Urea alcoholysis reaction is carried out under the conditions of agent is existing, generates ethylene carbonate or propene carbonate and ammonia, the ammonia of generation is used
It is used for other production technologies as denitrification reducing agent, the ethylene carbonate or propene carbonate of generation in SCR flue gas denitrification systems
Or finished product sale is made.
The beneficial effects of the utility model：Ethylene carbonate or propene carbonate are that a kind of higher boiling of function admirable is molten
Agent, surfactant base and organic synthesis intermediate, have the advantages that nontoxic, corrosivity is small, be referred to as 21 century green base
Plinth industrial chemicals, it is widely used in production battery, chemical fertilizer, fiber and is answered in the multiple fields such as organic synthesis and pharmacy, market
It is boundless with prospect.
Urea and second are used in this patent（Third）Glycol prepares denitrification reducing agent ammonia, substitution transport and storage safety as raw material
Property poor liquefied ammonia and ammoniacal liquor Ammonia Process, substantially increase the safe for operation of SCR denitration device or even whole thermal power plant
Property.
Conventional urea is pyrolyzed and the carbon dioxide of hydrolysis of urea Process Production directly discharges, and urea desorption column is low, economy
Poor, the product NH of alcoholysis reaction generation occurs for the utility model urea3For SCR denitration technique, while coproduction ethylene carbonate
Ester or propene carbonate make other commercial uses, can not only greatly improve urea desorption column, moreover it is possible to SCR denitration device is greatly reduced
Operating cost.
Brief description of the drawings
Fig. 1 is the device schematic flow sheet of the utility model embodiment；
In figure, 1-urea alcoholysis reaction unit, 2-circulating pump, 3-reboiler or circulation heat exchanger, 4-condenser,
5-vavuum pump, 6-ammonia surge tank, 7-Flow-rate adjustment valve group, 8-delivery pump, 9-NH3/ air mixer, 10-reduction
Agent injection device, 11-static mixing device, 12- denitration flues, 13-SCR Benitration reactors.
Embodiment
The utility model is further described with reference to specific embodiments and the drawings.
With reference to shown in figure 1, a kind of urea alcoholysis prepares the dress of denitrification reducing agent coproduction ethylene carbonate or propene carbonate
Put, including urea alcoholysis reaction unit 1, circulating pump 2, heater, condenser 4, vavuum pump 5, NH3/ air mixer 9 and also
Former agent injection device 10, the product gas outlet of urea alcoholysis reaction unit 1 connect with the entrance of condenser 4, condenser 4 it is cold
Condensate outlet is connected with the condensate inlet of urea alcoholysis reaction unit 1, and the ammonia outlet of condenser 4 is communicated to through vavuum pump 5
NH3The ammonia entrance of/air mixer 9, NH3The mixed gas outlet and selective catalytic reduction flue gas denitration of/air mixer 9
The reducing agent entrance connection of the reducing agent injection device 10 of system, preferably, reducing agent injection device 10 is located at Denitration in Boiler
In flue 12, static mixing device 11 is additionally provided with after reducing agent injection device 10.Urea alcoholysis reaction unit 1 produces provided with liquid
Thing outlet, liquid product loop exit and liquid product loop head, liquid product outlet connect through delivery pump 8 with transfer pipeline
To follow-up ethylene carbonate or propene carbonate processing unit, set between liquid product loop exit and liquid product loop head
Circulating pump 2 and heater are put, preferably, heater is reboiler or circulation heat exchanger 3.Alternatively, such as this implementation
Shown in example accompanying drawing, in addition to ammonia surge tank 6 and flow regulator, the ammonia outlet of condenser 4 are communicated to ammonia through vavuum pump 5
The entrance of gas surge tank 6, ammonia surge tank 6 exports is communicated to NH through flow regulator3The ammonia entrance of/air mixer 9, make
To be preferred, flow regulator is Flow-rate adjustment valve group 7.
The utility model provides a kind of denitrification reducing agent urea alcoholysis and prepares co-production ethylene carbonate or propene carbonate
Device, i.e., by urea and second（Third）Glycol is sent into urea alcoholysis reaction unit 1, is urinated under the conditions of existing for catalyst
Plain alcoholysis reaction, generates ethylene carbonate or propene carbonate and ammonia, the ammonia of generation are used for SCR denitration technique, generation
Ethylene carbonate or propene carbonate are used for other production technologies or finished product sale are made.Its key reaction formula is：
Preferred urea and second in above-mentioned reaction（Third）Glycol mol ratio is 1：1—5；The mass ratio of preferred catalyst and urea
For 0.1% -20%, reaction temperature is 100~250 DEG C, and reaction pressure can be negative pressure, normal pressure or malleation.
Above-mentioned reaction can use the ammonia that nitrogen or inert gas or carbon dioxide load-reaction generate, so as to improve
Conversion rate of urea.
Urea alcoholysis reaction unit 1 can be vertical or horizontal vessel in above-mentioned reaction, can set a urea alcoholysis
Reaction unit or more urea alcoholysis reaction units are used in series.
Catalyst in above-mentioned reaction can be the carbonate or metal oxygen of sodium, potassium, magnesium, aluminium, calcium, zinc, iron, lithium, zirconium etc.
Compound or chloride or the mixture being formulated by two kinds and the above carbonate, metal oxide or chloride or magnetic
Nanocatalyst or catalyst compounded grade or modified catalyst.
Urea alcoholysis reaction raw materials are urea, second（Third）Glycol and catalyst, above-mentioned raw materials can be respectively configured technique and set
Standby, pipe valve and control system are delivered to urea alcoholysis reaction unit, material mixer can also be set to press above-mentioned raw materials
Configured according to certain proportion and be heated to be delivered to urea alcoholysis reaction unit after certain temperature.
NH is set3/ air mixer 9 is reducing agent ammonia and air to be sufficiently mixed and by reducing agent NH3Be diluted to 5% with
Under safe concentration.
Denitrification reducing agent injection device 10 is set, denitrification reducing agent is evenly injected into denitration flue, after being
Continuous flue gas is well mixed to create favorable conditions.
In denitration flue entrance, static mixing device 11 is set, to by denitrification reducing agent ammonia and flue gas into SCR
It is well mixed before Benitration reactor 13, to ensure high denitration efficiency, low the escaping of ammonia and denitrating system exhaust pass section NOx
The uniformity of concentration.
Above-mentioned process system further sets corresponding DCS control systems, measures distribution system, pipeline, valve, instrument and
Annex etc., so that denitrification reducing agent urea alcoholysis prepares co-production ethylene carbonate or propene carbonate process system possesses company
Continue ammonia ability and adjustability processed, and adapt to the change of boiler load.
Specifically, with reference to shown in figure 1, urea, second（Third）Glycol and catalyst transport to urea alcoholysis reaction unit 1,
Reacted material is through 2 a part of forced circulation of circulating pump to reboiler or circulation heat exchanger 3 in urea alcoholysis reaction unit 1
Middle heating, a part of material（Ethylene carbonate or propene carbonate and other accessory substances）Enter through delivery pump 8 into follow-up process
Row rectifying separating treatment, urea can be continued on for by reclaiming catalyst simultaneously for final recovery product ethylene carbonate or propene carbonate
Alcoholysis reaction.Wherein in Matter Transfer, urea, second（Third）Glycol and catalyst transport are urinated to the bottom of urea alcoholysis reaction unit 1
The material of plain alcoholysis reaction device 1 is heated with the forced circulation of circulating pump 2 to reboiler or circulation heat exchanger 3, control heating
After 160~180 DEG C of temperature, then reenter from the top of urea alcoholysis reaction unit 1.Except the partial material of foregoing circulation
Outside, urea alcoholysis reaction unit 1, which exports, also discharges a part of product, and its discharge rate ensures that material is filling by tower reactor Liquid level
Residence time in putting is to meet required conversion rate of urea and carbonic acid third or the yield of vinyl acetate；After the product of discharge enters
Continuous catalyst separation system removes to separate the catalyst in product, is left the mixing of third or ethylene glycol and carbonic acid third or vinyl acetate
Thing, it can be separated into follow-up distillation system, third or ethylene glycol isolated can return to urea alcoholysis reaction unit.
Material after reboiler or circulation heat exchanger 3 heat returns to urea alcoholysis reaction unit 1 and continues to participate in reaction,
Ammonia caused by reaction and the second of part vaporization（Third）Glycol enters condenser 4, second from the top of urea alcoholysis reaction unit 1（Third）
Urea alcoholysis reaction unit 1 is back to after glycol is condensed, ammonia is then drawn into ammonia surge tank 6 by vavuum pump 5, through ammonia
Flow-rate adjustment valve group 7 adjusts appropriate ammonia（Matched with boiler load）Into ammonia/air mixer 9, reduced after through denitration
Agent injection device 10 enters denitration flue 12 after evenly distributing, and static mixing device 11 is set in the entrance of denitration flue 12, from
And be well mixed denitrification reducing agent ammonia with flue gas, subsequent ammonia enters SCR denitration reactor 13 with flue gas gaseous mixture, in catalyst
In the presence of, the purpose of SCR denitration is finally realized with the reaction of nitrogen oxides in boiler smoke.Product ethylene carbonate or carbonic acid
It is used for other production technologies after propylene is recovered or is packaged into finished product sale.
The device further sets corresponding DCS control systems, measures distribution system, and matches somebody with somebody circuits, valve, instrument and
Annex, so that denitrification reducing agent urea alcoholysis prepares co-production ethylene carbonate or propene carbonate process system possesses company
Continue ammonia ability and adjustability processed, and adapt to the change of boiler load.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (6)
1. a kind of urea alcoholysis prepares the device of denitrification reducing agent coproduction ethylene carbonate or propene carbonate, it is characterised in that：
Including urea alcoholysis reaction unit, circulating pump, heater, condenser, vavuum pump, NH3/ air mixer and reducing agent injection
Device, the product gas outlet of urea alcoholysis reaction unit connect with the entrance of condenser, the condensate outlet and urine of condenser
The condensate inlet connection of plain alcoholysis reaction device, the ammonia outlet of condenser are communicated to NH through vavuum pump3/ air mixer
Ammonia entrance, NH3The mixed gas outlet of/air mixer and the reducing agent injection of selective catalytic reduction flue gas denitration system fill
The reducing agent entrance connection put, urea alcoholysis reaction unit are provided with liquid product outlet, liquid product loop exit and liquid production
Thing loop head, liquid product outlet are communicated to follow-up ethylene carbonate or propene carbonate processing unit, liquid through transfer pipeline
State product circulation exports sets circulating pump and heater between liquid product loop head.
2. urea alcoholysis as claimed in claim 1 prepares the dress of denitrification reducing agent coproduction ethylene carbonate or propene carbonate
Put, it is characterised in that：Also include ammonia surge tank and flow regulator, the ammonia outlet of condenser is communicated to ammonia through vavuum pump
Gas surge tank entrance, the outlet of ammonia surge tank are communicated to NH through flow regulator3The ammonia entrance of/air mixer.
3. urea alcoholysis as claimed in claim 2 prepares the dress of denitrification reducing agent coproduction ethylene carbonate or propene carbonate
Put, it is characterised in that：Flow regulator is Flow-rate adjustment valve group.
4. urea alcoholysis as claimed in claim 1 prepares the dress of denitrification reducing agent coproduction ethylene carbonate or propene carbonate
Put, it is characterised in that：Heater is reboiler or circulation heat exchanger.
5. urea alcoholysis as claimed in claim 1 prepares the dress of denitrification reducing agent coproduction ethylene carbonate or propene carbonate
Put, it is characterised in that：The reducing agent injection device of selective catalytic reduction flue gas denitration system is in Denitration in Boiler flue.
6. urea alcoholysis as claimed in claim 5 prepares the dress of denitrification reducing agent coproduction ethylene carbonate or propene carbonate
Put, it is characterised in that：Static mixing device is additionally provided with after reducing agent injection device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720810438.5U CN207085651U (en) | 2017-07-06 | 2017-07-06 | Urea alcoholysis prepares denitrification reducing agent coproduction ethylene（Third）The device of alkene ester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720810438.5U CN207085651U (en) | 2017-07-06 | 2017-07-06 | Urea alcoholysis prepares denitrification reducing agent coproduction ethylene（Third）The device of alkene ester |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113426153A (en) * | 2021-06-25 | 2021-09-24 | 中国成达工程有限公司 | Production device and method for producing urea for liquid vehicle and urea solution for denitration |
| CN114917891A (en) * | 2022-05-26 | 2022-08-19 | 山东海科新源材料科技股份有限公司 | Synthetic method and application of non-noble metal supported catalyst |
-
2017
- 2017-07-06 CN CN201720810438.5U patent/CN207085651U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113426153A (en) * | 2021-06-25 | 2021-09-24 | 中国成达工程有限公司 | Production device and method for producing urea for liquid vehicle and urea solution for denitration |
| CN114917891A (en) * | 2022-05-26 | 2022-08-19 | 山东海科新源材料科技股份有限公司 | Synthetic method and application of non-noble metal supported catalyst |
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