CN209428145U - Urea hydrolysis ammonia producing system - Google Patents
Urea hydrolysis ammonia producing system Download PDFInfo
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- CN209428145U CN209428145U CN201822015391.0U CN201822015391U CN209428145U CN 209428145 U CN209428145 U CN 209428145U CN 201822015391 U CN201822015391 U CN 201822015391U CN 209428145 U CN209428145 U CN 209428145U
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- urea
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Abstract
The utility model discloses a kind of urea hydrolysis ammonia producing systems.It includes urea dissolution/holding vessel, the steam stream that steam-heating system generates is divided into two strands, one steam stream is passed through in heating coil by connecting pipeline, heating coil is located in hydrolysis reactor, another burst of steam stream is passed through stripped vapor spraying system by connecting pipeline, and stripped vapor spraying system is located at the bottom of hydrolysis reactor；Heating coil water outlet is connected to dissolution heating tube, and dissolution heating tube is located in urea dissolution/holding vessel；Urea dissolution/holding vessel water outlet lead to water inlet connecting pipeline on be successively arranged circulation conveying pump, the second solenoid electric valve；Urea dissolution/holding vessel is equipped with the connecting pipeline towards hydrolysis reactor；Hydrolysis reactor upper end is connected to nozzle, and nozzle is passed through ammonia mixer.The utility model has the advantages that low energy consumption, ammonia high conversion rate, at low cost.
Description
Technical field
The utility model relates to technical field of air pollution control, more specifically say it is urea hydrolysis ammonia producing system.More
Specifically say it is a kind of system that hydrolysis of urea ammonia is used for flue gas SCR (selective catalytic reduction system operating) denitration.
Background technique
China's power supply is based on coal-fired thermal power generation, and heat power plant boiler burning generates a large amount of flue gas,
Wherein the oxynitrides NOx of NOx is the major pollutants for causing photochemical fog and acid rain.Formally implement within 2012 " fire
Power plant's atmosphere pollutants emission standards " it requires, all fossil fuel fired boilers must be provided with denitrification apparatus, to control NOx pairs
The influence of environment.
And most common SCR denitration process technology is under the action of metallic catalyst, using ammonia by the NOx in flue gas
Also original production N2, to realize the qualified discharge of NOx.
The method for preparing ammonia at present mainly has liquefied ammonia/ammonium hydroxide ammonia, urea pyrolysis ammonia, the side such as hydrolysis of urea ammonia
Method.Liquefied ammonia/ammonium hydroxide belongs to dangerous material, and there are biggish risks in transport and storage.Urea is a kind of colourless chemicals, easily
In transport, storage is highly suitable as the raw materials for production of ammonia, but urea pyrolysis ammonia equipment is asked there are operating cost is higher
Topic, hydrolysis of urea have operation energy consumption low, safety, and stable feature increasingly receives an acclaim.
Existing Chinese Patent Application No. is 201710151844.X, and patent name is a kind of " urea seeding using waste heat
Hydrolyze ammonia system and method processed ", this method uses heat source of the hot-air as ammonium hydroxide solution, because the heat enthalpy value of hot-air is opposite
Small, the air quantity needed is big, thereby increases and it is possible to which there are hydrolysis to be not thorough, the slower problem of hydrolytic process；
Existing Chinese Patent Application No. is 201410490482.3, and patent name is a kind of " urea using boiler gas
Hydrolyze ammonia method and apparatus processed ", the heat source using boiler smoke as ammonium hydroxide solution, there are smoke components complexity (containing flying dust,
SO2Deng), after being passed through hydrolysis system, impurity can be generated, impurity cannot be excluded effectively, influence the use of hydrolytic decomposition pot, cause spray ammonia logical
The problems such as road blocks.
Current hydrolysis of urea system mostly uses the high-quality steam of power plant to be heated, but that there are heat utilization ratios is low,
The problems such as use cost is high.Therefore, now need to research and develop that a kind of heating efficiency is higher, and low energy consumption, ammonia high conversion rate is at low cost
Urea hydrolysis ammonia producing system.
Summary of the invention
The purpose of this utility model is to provide for a kind of urea hydrolysis ammonia producing system, and heating efficiency is higher, energy consumption
Low, ammonia high conversion rate is at low cost, overcomes heating efficiency in prior art technology not high, and it is direct to solve hydrolysis of urea waste liquid
The problem of waste caused by exhausting and pollution.
To achieve the goals above, the technical solution of the utility model are as follows: urea hydrolysis ammonia producing system, it is characterised in that:
Including urea dissolution/holding vessel, hydrolysis reactor and steam-heating system, the steam stream that steam-heating system generates is divided into two
Stock, one steam stream are passed through in heating coil by connecting pipeline, and the heating coil is located in the hydrolysis reactor, another
Stock steam stream is passed through stripped vapor spraying system by connecting pipeline, and the stripped vapor spraying system is located at the hydrolysis
The bottom of device；
The heating coil water outlet is connected to by connecting pipeline with dissolution heating tube, and the dissolution heating tube is located at described
In urea dissolution/holding vessel；
Urea dissolution/holding vessel the water outlet is equipped with the first connecting pipeline of connection water inlet, first connection
Circulation conveying pump and the second solenoid electric valve are successively arranged on pipeline；
There is hydrolysis reactor water inlet to be set to the hydrolysis reactor lower end, the urea dissolution/holding vessel, which is equipped with, to be connected
Lead to the second connecting pipeline of the hydrolysis reactor；The circulation conveying pump, first are successively arranged on second connecting pipeline
Solenoid electric valve and energy-saving heat exchanger；
The hydrolysis reactor lower end is equipped with hydrolysis reactor liquid outlet, and the hydrolysis reactor liquid outlet is logical
It crosses third connecting pipe to be connected with gas-liquid separator, the third connecting pipe is connected with the energy-saving heat exchanger；
The gas-liquid separator upper end is equipped with gas discharge outlet, and the gas discharge outlet is connected with the ammonia mixer
Logical, lower end is equipped with gas-liquid separator liquid outlet, the gas-liquid separator liquid outlet and the urea dissolution/holding vessel
It is connected；
The hydrolysis reactor upper end is connected to nozzle, and the nozzle is passed through ammonia mixer；Dilution air passes through connection
Pipeline is connected with the ammonia mixer；The ammonia mixer is equipped with the pipeline towards flue denitrating system.
In the above-mentioned technical solutions, the connecting pipeline of the gas-liquid separator and the urea dissolution/holding vessel is equipped with
Third solenoid electric valve.
In the above-mentioned technical solutions, the water inlet of the urea dissolution/holding vessel is set to the top of water outlet.
In the above-mentioned technical solutions, the dissolution heating tube water outlet is connected to by connecting pipeline with waste water treatment system.
In the above-mentioned technical solutions, the steam stream that the steam-heating system generates is passed through on the connecting pipeline of heating coil
Equipped with cooling decompression device.
The utility model has the advantages that
(1) the utility model heating efficiency is higher, and the utility model energy consumption is 0.9MJ/kg NH3, the utility model
Energy consumption reduces by 7~10% than the prior art, and the utility model conversion ratio is 99%, and the yield of the utility model is mentioned than the prior art
High by 5% or more, the utility model energy consumption is lower, and ammonia high conversion rate, cost is relatively low；
(2) the utility model steam-heating system is divided into two strands, and wherein one steam stream is passed through in heating coil and urea
Solution carries out indirect heat exchange, and the condensate liquid after heat exchange still contains higher temperature, is introduced into urea dissolving tank, for heating
Dissolving tank promotes the dissolution (urea dissolves about 40 DEG C of required temperature) of urea, improves the utilization rate of energy；Another burst of steam stream is made
It is directly sprayed into hydrolysis of urea reactor by spray head for stripped vapor, accelerates NH in urea liquid3The release of gaseous mixture, takes away
The NH of the dissolution that hydrolysis of urea generates in the solution3And CO2, while urea liquid is disturbed, is stirred, solution is heated evenly,
Keep hydrolysis of urea more thorough, heat transfer efficiency is high, and the waste heat of stripped vapor can also keep the temperature ammonia gas mixture conveyance conduit,
Anti- non-return is solidifying；
(3) waste heat of poor urea liquid is used as the preheating of urea feedstock solution by the utility model, promotes the benefit of waste heat
With energy-efficient effect can be played, the poor urea liquid (almost pure water contains certain temperature) after heat exchange utilizes is reused for
The dissolution of urea reduces the use of dissolution demineralized water and the investment of heat to a certain extent.
Detailed description of the invention
FIG. 1 is a schematic structural view of the utility model.
1- urea dissolution/holding vessel in figure, 1.1- water inlet, 1.2- water outlet, the first connecting pipeline of 1.3-, 1.4- second
Connecting pipeline, 2- circulation conveying pump, 3- energy-saving heat exchanger, 4- hydrolysis reactor, 4.1- hydrolysis reactor liquid outlet, 4.2-
Third connecting pipe, 4.3- hydrolysis reactor water inlet, 5- cooling decompression device, 6- ammonia mixer, 7- dilution air, 8- gas
Liquid/gas separator, 8.1- gas discharge outlet, 8.2- gas-liquid separator liquid outlet, 9- nozzle, the first solenoid electric valve of 10-, 11-
Heating coil, 12- stripped vapor spraying system, 13- dissolve heating tube, the second solenoid electric valve of 14-, 15- third Electromagnetic Control
Valve, 16- waste water treatment system, 17- steam-heating system, 18- DW system demineralized water system, 19- urea system.
Specific embodiment
The performance that according to the present invention will be described in detail below with reference to the accompanying drawings, but they are not constituted to the utility model
It limits, it is only for example.The advantages of making the utility model by explanation simultaneously, is more clear and is readily appreciated that.
Refering to known to attached drawing: urea hydrolysis ammonia producing system, including urea dissolution/holding vessel 1, hydrolysis reactor 4 and steam
Heating system 17, the flow of superheated steam that steam-heating system 17 generates are divided into two strands, one steam stream is passed through by connecting pipeline
In heating coil 11, the heating coil 11 is located in the hydrolysis reactor 4, and another burst of steam stream is passed through by connecting pipeline
Stripped vapor spraying system 12, the stripped vapor spraying system 12 are located at the bottom of the hydrolysis reactor 4, stripped vapor spray
The NH of dissolution can be taken away by penetrating system 123And CO2, play the role of disturbance, stirring is heated evenly solution, moreover it is possible to mixed
Ammonia gas mixture body is kept the temperature, and anti-non-return is solidifying；
11 water outlet of heating coil is connected to by connecting pipeline with dissolution heating tube 13, and described dissolution heating tube 13
In in the urea dissolution/holding vessel 1；In hydrolysis of urea tank after the steam condensation of indirect heating, temperature still with higher,
It is introduced into urea dissolving tank, for dissolving by heating tank, the dissolution of urea is can promote, improves the utilization rate of energy；
1 water outlet 1.2 of urea dissolution/holding vessel is equipped with the first connecting pipeline 1.3 of connection water inlet 1.1, institute
It states and is successively arranged circulation conveying pump 2 and the second solenoid electric valve 14 on the first connecting pipeline 1.3, circulation conveying pump 2 can promote urine
Circulation of the plain solution in pipeline, accelerates course of dissolution, and the urea liquid dissolved delivers into hydrolysis of urea system；
There is hydrolysis reactor water inlet 4.3 to be set to 4 lower end of hydrolysis reactor, is set on the urea dissolution/holding vessel 1
There is the second connecting pipeline 1.4 for being connected to the hydrolysis reactor 4,1.4 both ends of the second connecting pipeline are separately connected 1.2 He of water outlet
Hydrolysis reactor water inlet 4.3；It is successively arranged the circulation conveying on the pipeline and pumps the 2, first solenoid electric valve 10 and energy conservation
Heat exchanger 3, energy-saving heat exchanger are changed as the poor urea liquid in urea liquid preheating device, with the second connecting pipeline 1.4
Heat；
4 lower end of hydrolysis reactor is equipped with hydrolysis reactor liquid outlet 4.1, the hydrolysis reactor liquid discharge
Mouth 4.1 is connected by third connecting pipe 4.2 with gas-liquid separator 8, and the third connecting pipe 4.2 exchanges heat with the energy conservation
Device 3 is connected, and energy-saving heat exchanger exchanges heat as urea liquid preheating device with poor urea liquid；
8 upper end of gas-liquid separator is equipped with gas discharge outlet 8.1, and the gas discharge outlet 8.1 is mixed with the ammonia
Device 6 is connected, lower end is equipped with gas-liquid separator liquid outlet 8.2, the gas-liquid separator liquid outlet 8.2 and the urine
Plain dissolution/holding vessel 1 is connected, and liquid is discharged into urea dissolving tank, uses (urea containing minute quantity) as demineralized water, is reused for urinating
The dissolution of element, reduces the use of dissolution demineralized water and the investment of heat to a certain extent；
4 upper end of hydrolysis reactor is connected to nozzle 9, and the nozzle 9 is passed through ammonia mixer 6；Dilution air 7 passes through
Connecting pipeline is connected with the ammonia mixer 6；The ammonia mixer 6 is equipped with the pipeline towards flue denitrating system.
The connecting pipeline of the gas-liquid separator 8 and the urea dissolution/holding vessel 1 is equipped with third solenoid electric valve
15。
The water inlet 1.1 of the urea dissolution/holding vessel 1 is set to the upper of 1 water outlet 1.2 of urea dissolution/holding vessel
It is square, it is equipped with circulation conveying between inlet and outlet and pumps, circulation conveying pump can promote circulation of the urea liquid in pipeline, add
Fast course of dissolution, the urea liquid dissolved deliver into hydrolysis of urea system.
13 water outlet of dissolution heating tube is connected to by connecting pipeline with waste water treatment system 16.
The connecting pipeline that the steam stream that the steam-heating system 17 generates is passed through heating coil 11 is equipped with cooling decompression
Device 5 is adjusted to meeting demand the temperature and pressure of steam stream.
The hydrolysis of urea method of urea hydrolysis ammonia producing system described in the utility model, includes the following steps:
Urea granules in urea system 19 are added to urine by corresponding entrance with the demineralized water in DW system demineralized water system 18
In plain dissolution/holding vessel 1, urea granules are configured to urea liquid；The heat of urea dissolving tank is by hydrolysis reactor coil pipe
Condensate liquid provides (control heat-exchange temperature is 40 DEG C) by the dissolution heating tube in urea dissolution/holding vessel 1, and urea is dissolved as
The endothermic reaction, heating can promote the dissolution of urea, and dissolution heating tube is discharged into waste water treatment system；
It is provided with energy-saving heat exchanger 3 on transfer pipeline, as urea liquid preheating device, is changed with poor urea liquid
Heat, energy-saving heat exchanger 3 increase the urea solution temperature on the second connecting pipeline 1.4；
It is provided with steam-heating system in hydrolysis reactor, for providing the heat of hydrolysis of urea, controls hydrolysis reactor
Temperature is to meeting the requirements；Steam-heating system herein is exactly the heating coil of hydrolysis reactor, because the medium that the inside is walked is exactly
Steam provides heat by coil heat exchange for hydrolysis；
4 bottom of hydrolysis reactor is provided with stripped vapor spraying system 12, can take away the NH of dissolution3And CO2, disturbance is played,
The effect of stirring, is heated evenly solution, moreover it is possible to keep the temperature to mixed ammonia gas mixture body, anti-non-return is solidifying；
Hydrolysis reactor 4 is discharged by nozzle 9 in the ammonia gas mixture generated in hydrolysis reactor 4, and ammonia gas mixture passes through
Nozzle 9 is sent into ammonia mixer 6, pressure reduction of the ammonia gas mixture at nozzle 9；
Air is sent into ammonia mixer 6 by dilution air 7, after diluting in ammonia gas mixture in ammonia mixer 6, is sent into
Flue denitrating system；
The poor urea liquid generated after hydrolysis is discharged by outlet, and poor urea liquid carries out waste heat benefit through energy-saving heat exchanger
With rear, into gas-liquid separator 8, the gas of generation imports ammonia mixer pipeline, and liquid is discharged into urea dissolution/holding vessel 1, when
Demineralized water is done with (urea containing minute quantity, the liquid area content is less than 0.5%, NH3It is about 7ppm).
Other unaccounted parts belong to the prior art.
Claims (5)
1. urea hydrolysis ammonia producing system, it is characterised in that: including urea dissolution/holding vessel (1), hydrolysis reactor (4) and steam
Heating system (17), the steam stream that steam-heating system (17) generates are divided into two strands, one steam stream is passed through by connecting pipeline
In heating coil (11), the heating coil (11) is located in the hydrolysis reactor (4), and another burst of steam stream passes through communicating pipe
Road is passed through stripped vapor spraying system (12), and the stripped vapor spraying system (12) is located at the bottom of the hydrolysis reactor (4)
Portion；
Heating coil (11) water outlet is connected to by connecting pipeline with dissolution heating tube (13), the dissolution heating tube (13)
In the urea dissolution/holding vessel (1)；
The urea dissolution/holding vessel (1) water outlet (1.2) is equipped with the first connecting pipeline of connection water inlet (1.1)
(1.3), circulation conveying pump (2) and the second solenoid electric valve (14) are successively arranged on first connecting pipeline (1.3)；
There are hydrolysis reactor water inlet (4.3) on the hydrolysis reactor (4) lower end, the urea dissolution/holding vessel (1)
Equipped with the second connecting pipeline (1.4) for being connected to the hydrolysis reactor (4)；It is successively arranged on second connecting pipeline (1.4)
The circulation conveying pump (2), the first solenoid electric valve (10) and energy-saving heat exchanger (3)；
Hydrolysis reactor (4) lower end is equipped with hydrolysis reactor liquid outlet (4.1), the hydrolysis reactor liquid discharge
Mouthful (4.1) are connected by third connecting pipe (4.2) with gas-liquid separator (8), the third connecting pipe (4.2) with it is described
Energy-saving heat exchanger (3) is connected；
Gas-liquid separator (8) upper end is equipped with gas discharge outlet (8.1), the gas discharge outlet (8.1) and ammonia mixer
(6) it is connected, lower end is equipped with gas-liquid separator liquid outlet (8.2), the gas-liquid separator liquid outlet (8.2) and institute
Urea dissolution/holding vessel (1) is stated to be connected；
Hydrolysis reactor (4) upper end is connected to nozzle (9), and the nozzle (9) is passed through ammonia mixer (6)；Dilution air
(7) it is connected by connecting pipeline with the ammonia mixer (6)；The ammonia mixer (6), which is equipped with, leads to flue denitration
The pipeline of system.
2. urea hydrolysis ammonia producing system according to claim 1, it is characterised in that: the gas-liquid separator (8) with it is described
Urea dissolution/holding vessel (1) connecting pipeline is equipped with third solenoid electric valve (15).
3. urea hydrolysis ammonia producing system according to claim 1 or 2, it is characterised in that: the urea dissolution/holding vessel
(1) water inlet (1.1) is set to the top of water outlet (1.2).
4. urea hydrolysis ammonia producing system according to claim 3, it is characterised in that: dissolution heating tube (13) water outlet
It is connected to by connecting pipeline with waste water treatment system (16).
5. urea hydrolysis ammonia producing system according to claim 4, it is characterised in that: the steam-heating system (17) generates
Steam stream be passed through heating coil (11) connecting pipeline be equipped with cooling decompression device (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822015391.0U CN209428145U (en) | 2018-12-03 | 2018-12-03 | Urea hydrolysis ammonia producing system |
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| CN201822015391.0U CN209428145U (en) | 2018-12-03 | 2018-12-03 | Urea hydrolysis ammonia producing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109279625A (en) * | 2018-12-03 | 2019-01-29 | 武汉龙净环保工程有限公司 | Urea hydrolysis ammonia producing system and its hydrolysis ammonia method processed |
| CN114505044A (en) * | 2022-02-23 | 2022-05-17 | 西安热工研究院有限公司 | Filling type urea catalytic hydrolysis system and method |
-
2018
- 2018-12-03 CN CN201822015391.0U patent/CN209428145U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109279625A (en) * | 2018-12-03 | 2019-01-29 | 武汉龙净环保工程有限公司 | Urea hydrolysis ammonia producing system and its hydrolysis ammonia method processed |
| CN109279625B (en) * | 2018-12-03 | 2024-02-02 | 武汉龙净环保工程有限公司 | Urea hydrolysis ammonia production system and hydrolysis ammonia production method thereof |
| CN114505044A (en) * | 2022-02-23 | 2022-05-17 | 西安热工研究院有限公司 | Filling type urea catalytic hydrolysis system and method |
| CN114505044B (en) * | 2022-02-23 | 2023-10-20 | 西安热工研究院有限公司 | Filling urea catalytic hydrolysis system and method |
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