CN209752623U - Online debugging and switching device for urea hydrolysis system - Google Patents
Online debugging and switching device for urea hydrolysis system Download PDFInfo
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- CN209752623U CN209752623U CN201920341600.2U CN201920341600U CN209752623U CN 209752623 U CN209752623 U CN 209752623U CN 201920341600 U CN201920341600 U CN 201920341600U CN 209752623 U CN209752623 U CN 209752623U
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 239000004202 carbamide Substances 0.000 title claims abstract description 40
- 230000007062 hydrolysis Effects 0.000 title claims abstract description 29
- 238000006460 hydrolysis reaction Methods 0.000 title claims abstract description 29
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 114
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 39
- 238000010790 dilution Methods 0.000 claims abstract description 24
- 239000012895 dilution Substances 0.000 claims abstract description 24
- 230000001105 regulatory effect Effects 0.000 claims abstract description 20
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 238000002955 isolation Methods 0.000 claims description 2
- 230000006872 improvement Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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- Exhaust Gas After Treatment (AREA)
Abstract
The utility model discloses an online debugging and switching device for a urea hydrolysis system, wherein an ammonia gas pipe A, an outlet of which is connected with one end of a regulating valve group B, the other end of the regulating valve group B is connected with an inlet of an ammonia air mixer C, and an outlet of the ammonia air mixer C is connected with a flue D through a valve F1; the inlet of the dilution air pipe G is connected with air, and the outlet of the dilution air pipe G is connected with the inlet of the ammonia-air mixer C; an outlet of the ammonia pipe A1 is connected with one end of an adjusting valve group B1, the other end of the adjusting valve group B1 is connected with an inlet of an ammonia air mixer C1, and an outlet of the ammonia air mixer C1 is connected with a temporary ammonia spraying branch pipe D1 through a valve F2 and a valve F3; the inlet of the dilution air pipe G1 is connected with air, and the outlet of the dilution air pipe G1 is connected with the inlet of the ammonia-air mixer C1; the temporary conduit E is connected at one end to the conduit after the valve F1 and at the other end to the conduit between the valve F2 and the valve F3. The utility model discloses can carry out the switching of system debugging and liquid ammonia system and urea system of hydrolysising when the unit does not shut down.
Description
Technical Field
The utility model relates to a urea technical field that hydrolysises particularly, relates to an online debugging and auto-change over device for urea system of hydrolysising.
background
The SCR denitration technology is more and more widely used in thermal power generating units in China, and the SCR denitration technology is adopted for more than 98% of newly-built units. The SCR denitration reducing agent ammonia is prepared from liquid ammonia, urea and ammonia water. Ammonia is both a toxic gas and a combustible gas, and is prone to explosion. Compared with ammonia evaporation and liquid ammonia evaporation technologies, the preparation of ammonia gas by taking urea as a raw material has higher safety, and in recent years, urea gradually replaces liquid ammonia as a raw material for preparing a reducing agent. The technology for preparing ammonia from urea is mature at present, urea pyrolysis and urea hydrolysis are adopted for preparing ammonia, and compared with the urea pyrolysis, the technology for preparing ammonia from urea hydrolysis has the advantages of low energy consumption, safety and convenience in use and the like, and is gradually popularized and applied. In urea hydrolysis transformation engineering, after urea hydrolysis system installation is accomplished, during urea hydrolysis system debugging, need unit independent debugging after stopping, liquid ammonia and urea hydrolysis system's switching must let the unit shut down for a long time, just can switch over the operation completely after urea hydrolysis system debugging is accomplished, the long-time shut down of unit had both brought huge influence for the cost and the economic benefits of power plant, also does not benefit to the industrial production and the resident power consumption of enterprise.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, an object of the present invention is to provide an online debugging and switching device for urea hydrolysis system, which can realize the debugging of equipment system under the condition that the unit is not shut down, and can switch the liquid ammonia system and the urea hydrolysis system online.
the utility model provides an online debugging and auto-change over device for urea system of hydrolysising, include:
An outlet of an ammonia gas pipe A of the liquid ammonia system is connected with one end of a regulating valve group B, the other end of the regulating valve group B is connected with an ammonia gas inlet of an ammonia-air mixer C, a mixed gas outlet of the ammonia-air mixer C is connected with a flue D in front of an SCR reactor through a valve F1, and a valve F22 is arranged on a pipeline between the regulating valve group B and the ammonia-air mixer C;
an inlet of a dilution air pipe G of the liquid ammonia system is connected with air, and an outlet of the dilution air pipe G is connected with an air inlet of the ammonia-air mixer C;
An outlet of an ammonia gas pipe A1 of the urea hydrolysis system is connected with one end of a regulating valve group B1, the other end of the regulating valve group B1 is connected with an ammonia gas inlet of an ammonia-air mixer C1, a mixed gas outlet of the ammonia-air mixer C1 is connected with a temporary ammonia spraying branch pipe D1 through a valve F2 and a valve F3, and a valve F5 is arranged on a pipeline between the regulating valve group B1 and the ammonia-air mixer C1;
An inlet of a dilution air pipe G1 of the urea hydrolysis system is connected with air, and an outlet of the dilution air pipe G1 is connected with an air inlet of the ammonia air mixer C1;
One end of the temporary pipeline E is connected to the pipeline behind the valve F1, the other end of the temporary pipeline E is connected to the pipeline between the valve F2 and the valve F3, and one end of the temporary pipeline E, close to the valve F1, is provided with a valve F4.
As a further improvement, the flue D is provided with a hole matched with the temporary pipeline E, and the opening is provided with an isolation door.
as a further improvement of the present invention, the dilution air duct G is sequentially provided with an air blower H, a valve F6, a valve F7 and a valve F8, and the dilution air duct G1 is sequentially provided with an air blower H1, a valve F9, a valve F10 and a valve F11.
as a further improvement of the present invention, the valve F6, the valve F8, the valve F8 and the valve F11 are stop valves, the valve F6 and the valve F9 are check valves, the valve F7 and the valve F10 are pneumatic butterfly valves.
as a further improvement of the present invention, the regulating valve group B includes: valve F12, valve F13, valve F14, valve F15 and valve F16, and valve bank B1 includes: valve F17, valve F18, valve F19, valve F20, and valve F21.
As a further improvement of the present invention, said valve F12, said valve F15, said valve F16, said valve F17, said valve F20 and said valve F21 are stop valves.
as a further improvement of the present invention, the valve F13 and the valve F18 are both solenoid valves.
As a further improvement of the present invention, the valve F14 and the valve F19 are both pneumatic control valves.
As a further improvement of the present invention, the valve F1, the valve F2, the valve F3 and the valve F4 are stop valves, and the valve F5 and the valve F22 are check valves.
The utility model has the advantages that:
The urea hydrolysis system can realize the debugging of the equipment system under the condition that the unit does not shut down, and the on-line switching of the liquid ammonia system and the urea hydrolysis system is carried out. The debugging cost of the equipment is reduced, the debugging time is saved, the generating time of the unit is prolonged, and the shutdown times are reduced.
Drawings
Fig. 1 is a schematic structural diagram of an online debugging and switching device for a urea hydrolysis system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
The utility model discloses an online debugging and auto-change over device for urea system of hydrolysising, the debugging is in the unit operation, behind the empty blender of ammonia to the interim pipeline of debugging of mother's pipe department increase between the system valve, connects to the flue before near SCR reactor, and the isolating gate is add in the flue trompil, and the valve is established at easy operating position. The temporary heat preservation protection work is done on the pipeline and the flue, the ammonia supply performance of the urea hydrolysis system is tested and adjusted through the temporary pipeline, and the temporary pipeline is dismantled after the debugging is finished.
As shown in fig. 1, includes:
An outlet of an ammonia gas pipe A of the liquid ammonia system is connected with one end of an adjusting valve group B, the other end of the adjusting valve group B is connected with an ammonia gas inlet of an ammonia-air mixer C, a mixed gas outlet of the ammonia-air mixer C is connected with a flue D in front of the SCR reactor through a valve F1, a valve F22 is arranged on a pipeline between the adjusting valve group B and the ammonia-air mixer C, a hole matched with the temporary pipeline E is formed in the flue D, and an isolating door is arranged at the hole;
An inlet of a dilution air pipe G of the liquid ammonia system is connected with air, and an outlet of the dilution air pipe G is connected with an air inlet of the ammonia-air mixer C;
An outlet of an ammonia gas pipe A1 of the urea hydrolysis system is connected with one end of an adjusting valve group B1, the other end of an adjusting valve group B1 is connected with an ammonia gas inlet of an ammonia air mixer C1, a mixed gas outlet of the ammonia air mixer C1 is connected with a temporary ammonia spraying branch pipe D1 through a valve F2 and a valve F3, and a valve F5 is arranged on a pipeline between the adjusting valve group B1 and the ammonia air mixer C1;
An inlet of a dilution air pipe G1 of the urea hydrolysis system is connected with air, and an outlet of the dilution air pipe G1 is connected with an air inlet of an ammonia-air mixer C1;
one end of the temporary pipeline E is connected to the pipeline behind the valve F1, the other end of the temporary pipeline E is connected to the pipeline between the valve F2 and the valve F3, and one end of the temporary pipeline E close to the valve F1 is provided with a valve F4.
Wherein, the dilution air pipe G is sequentially provided with a blower H, a valve F6, a valve F7 and a valve F8, and the dilution air pipe G1 is sequentially provided with a blower H1, a valve F9, a valve F10 and a valve F11. The valve F6 and the valve F9 are check valves, and the valve F8 and the valve F11 are stop valves. Both valve F7 and valve F10 are pneumatic butterfly valves.
The regulating valve group B includes: valve F12, valve F13, valve F14, valve F15 and valve F16, and valve bank B1 includes: valve F17, valve F18, valve F19, valve F20, and valve F21. Valve F12, valve F15, valve F16, valve F17, valve F20 and valve F21 are all stop valves. Both valve F13 and valve F18 are solenoid valves. Both valve F14 and valve F19 are pneumatic regulating valves.
The valve F1, the valve F2, the valve F3 and the valve F4 are all stop valves, and the valve F5 and the valve F22 are all check valves.
the utility model discloses a concrete application method of on-line debugging and auto-change over device for urea system of hydrolysising:
according to the concentration of nitrogen oxides and ammonia at the outlet of the SCR reactor, opening a valve F2 at an ammonia supply outlet of the urea hydrolysis system, slowly opening a valve F5 for controlling the flow of ammonia injection, introducing the ammonia mixed by the ammonia air mixer C1 into a temporary pipeline E, closing a valve F2 after the urea hydrolysis system reacts stably, and carrying out hot standby.
Slowly opening a valve F4 on a temporary pipeline E, gradually switching ammonia gas into the liquid ammonia system through the temporary pipeline E, entering an ammonia injection grid in a flue D in front of the SCR reactor, gradually closing an adjusting valve group B, and gradually putting the liquid ammonia system into hot standby and the urea hydrolysis system into full use.
wherein, the ammonia consumption of the urea hydrolysis system is set to be the same as that of the liquid ammonia system. The flow rate, the pressure and the like of the ammonia gas entering from the ammonia gas inlet of the ammonia air mixer C1 are adjusted through the adjusting valve group B1, the flow rate, the pressure and the like of the air entering from the air inlet of the ammonia air mixer C1 are adjusted through a valve on the dilution air pipe G1, and after the adjustment, the ammonia consumption output from the mixed gas outlet of the ammonia air mixer C1 meets the requirements. The ammonia gas entering from the ammonia gas inlet of the ammonia air mixer C is subjected to flow rate, pressure and the like regulation through the regulating valve group B, the air entering from the air inlet of the ammonia air mixer C is subjected to flow rate, pressure and the like regulation through the valve on the dilution air pipe G, and after regulation, the ammonia consumption output from the mixed gas outlet of the ammonia air mixer C meets the requirements.
When the urea hydrolysis system and the liquid ammonia system are switched on line, the ammonia injection amount may be changed due to the rapid change of the ammonia flow when the switching is too fast, so that the denitration efficiency of a unit is influenced, the switching of the two systems needs to be slowly carried out, and the emission is prevented from exceeding the standard.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An on-line commissioning and switching device for a urea hydrolysis system, comprising:
an outlet of an ammonia gas pipe A of the liquid ammonia system is connected with one end of a regulating valve group B, the other end of the regulating valve group B is connected with an ammonia gas inlet of an ammonia-air mixer C, a mixed gas outlet of the ammonia-air mixer C is connected with a flue D in front of an SCR reactor through a valve F1, and a valve F22 is arranged on a pipeline between the regulating valve group B and the ammonia-air mixer C;
An inlet of a dilution air pipe G of the liquid ammonia system is connected with air, and an outlet of the dilution air pipe G is connected with an air inlet of the ammonia-air mixer C;
An outlet of an ammonia gas pipe A1 of the urea hydrolysis system is connected with one end of a regulating valve group B1, the other end of the regulating valve group B1 is connected with an ammonia gas inlet of an ammonia-air mixer C1, a mixed gas outlet of the ammonia-air mixer C1 is connected with a temporary ammonia spraying branch pipe D1 through a valve F2 and a valve F3, and a valve F5 is arranged on a pipeline between the regulating valve group B1 and the ammonia-air mixer C1;
An inlet of a dilution air pipe G1 of the urea hydrolysis system is connected with air, and an outlet of the dilution air pipe G1 is connected with an air inlet of the ammonia air mixer C1;
One end of the temporary pipeline E is connected to the pipeline behind the valve F1, the other end of the temporary pipeline E is connected to the pipeline between the valve F2 and the valve F3, and one end of the temporary pipeline E, close to the valve F1, is provided with a valve F4.
2. The on-line debugging and switching device according to claim 1, wherein said flue D is opened with a hole matching with said temporary pipeline E, and an isolation door is provided at the opened hole.
3. The on-line debugging and switching device of claim 1, wherein said dilution air duct G is sequentially provided with a blower H, a valve F6, a valve F7 and a valve F8, and said dilution air duct G1 is sequentially provided with a blower H1, a valve F9, a valve F10 and a valve F11.
4. The online debugging and switching device of claim 3, wherein said valve F8 and said valve F11 are both stop valves, said valve F6 and said valve F9 are both check valves, and said valve F7 and said valve F10 are both pneumatic butterfly valves.
5. The on-line commissioning and switching device of claim 1, wherein said regulating valve block B comprises: valve F12, valve F13, valve F14, valve F15 and valve F16, and valve bank B1 includes: valve F17, valve F18, valve F19, valve F20, and valve F21.
6. The online debugging and switching device of claim 5, wherein said valve F12, said valve F15, said valve F16, said valve F17, said valve F20 and said valve F21 are all stop valves.
7. The on-line debugging and switching device of claim 5, wherein said valve F13 and said valve F18 are both solenoid valves.
8. The on-line commissioning and switching device of claim 5, wherein said valve F14 and said valve F19 are both pneumatic regulating valves.
9. The online commissioning and switching device of claim 1, wherein said valve F1, said valve F2, said valve F3, and said valve F4 are all stop valves, and said valve F5 and said valve F22 are all check valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920341600.2U CN209752623U (en) | 2019-03-18 | 2019-03-18 | Online debugging and switching device for urea hydrolysis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920341600.2U CN209752623U (en) | 2019-03-18 | 2019-03-18 | Online debugging and switching device for urea hydrolysis system |
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| Publication Number | Publication Date |
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| CN209752623U true CN209752623U (en) | 2019-12-10 |
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| CN201920341600.2U Active CN209752623U (en) | 2019-03-18 | 2019-03-18 | Online debugging and switching device for urea hydrolysis system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109833774A (en) * | 2019-03-18 | 2019-06-04 | 大唐环境产业集团股份有限公司 | It is a kind of for the on-line debugging and switching device of hydrolysis of urea system, method |
-
2019
- 2019-03-18 CN CN201920341600.2U patent/CN209752623U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109833774A (en) * | 2019-03-18 | 2019-06-04 | 大唐环境产业集团股份有限公司 | It is a kind of for the on-line debugging and switching device of hydrolysis of urea system, method |
| CN109833774B (en) * | 2019-03-18 | 2024-08-27 | 大唐环境产业集团股份有限公司 | Online debugging and switching device and method for urea hydrolysis system |
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