CN219400178U - Urea pyrolysis ammonia production system for SCR denitration - Google Patents
Urea pyrolysis ammonia production system for SCR denitration Download PDFInfo
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- CN219400178U CN219400178U CN202320777224.8U CN202320777224U CN219400178U CN 219400178 U CN219400178 U CN 219400178U CN 202320777224 U CN202320777224 U CN 202320777224U CN 219400178 U CN219400178 U CN 219400178U
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Abstract
The utility model provides a urea pyrolysis ammonia production system for SCR denitration, which comprises a urea solution feeding module, a urea flow regulating module, a urea solution injection module and a control system which are sequentially communicated through pipelines, wherein the urea solution feeding module comprises a urea feeding tank, a urea solution feeding valve group and a feeding pump, the outlet end of the urea feeding tank is connected with the inlet end of the feeding pump through the urea feeding valve group, an automatic clear water flushing module is arranged between the outlet end of the urea solution feeding valve group and the inlet end of the feeding pump, the automatic clear water flushing module comprises a clear water flushing valve group, and the clear water flushing valve group is respectively connected with the outlet end of the urea solution feeding valve group and the inlet end of the feeding pump. According to the utility model, no matter in a production or stop state, no urea solution residue exists in a system pipeline by adding the automatic flushing module, so that urea crystallization in the pipeline is avoided, and the stable flow of the urea solution is ensured to enter the urea pyrolysis chamber.
Description
Technical Field
The utility model relates to the technical field of SCR denitration, in particular to a urea pyrolysis ammonia production system for SCR denitration.
Background
The most effective means of reducing the emission of nitrogen oxides in flue gas is the SCR process of selective catalytic reduction, which uses amino reducing agents such as: liquid ammonia, ammonia water and urea. The liquid ammonia is simple to use, but is a dangerous chemical, and has a plurality of restrictions during use. The ammonia water has lower ammonia content, large equipment volume and higher transportation cost. Urea has been widely used in denitration devices due to its safety, stability and easy storage characteristics.
However, in the production or stop state, the urea solution is very easy to crystallize and separate out in the pipeline, so that the problems of blocking the pipeline, wearing the impeller and the mechanical seal of the pump and the like are caused, and meanwhile, the flow of urea is reduced, so that the production requirement cannot be met.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides the urea pyrolysis ammonia production system for SCR denitration, which effectively solves the problem that high-concentration urea is easy to crystallize during production, and greatly prolongs the service life and the precision of pumps and control valves in the system.
The utility model adopts the following technical scheme for solving the technical problems:
the urea pyrolysis ammonia production system comprises a urea solution feeding module, a urea flow regulating module, a urea solution injection module and a control system which are communicated sequentially through pipelines, wherein the urea solution feeding module comprises a urea feeding tank, a urea solution feeding valve group and a feeding pump, the outlet end of the urea feeding tank is connected with the inlet end of the feeding pump through the urea solution feeding valve group, and an automatic clear water flushing module is arranged between the outlet end of the urea solution feeding valve group and the inlet end of the feeding pump; the automatic clear water flushing module comprises a clear water flushing valve group, the clear water flushing valve group is respectively connected with the outlet end of the urea solution feeding valve group and the inlet end of the feeding pump, and the clear water flushing valve group comprises a clear water supplementing automatic cut-off valve and a check valve.
Further, the urea flow regulating module comprises a pressure stabilizing reflux control valve, a urea solution pressure gauge, a urea solution flowmeter and a urea solution flow regulating valve.
Further, the urea solution injection module comprises a urea pyrolysis chamber and a two-fluid atomizer, wherein the two-fluid atomizer is installed in the urea pyrolysis chamber.
Further, an inlet end of the urea feeding tank is connected with the urea flow regulating module through a pipeline provided with a urea solution reflux valve.
Further, an atomization compressed air adjusting module is arranged between the urea solution flow adjusting valve and the urea solution injection module.
Further, the atomizing compressed air conditioning module comprises a compressed air flow meter, a compressed air flow rate regulating valve and a compressed air pressure meter.
Further, the atomization compressed air conditioning module is connected with an outlet of the feed pump through a purging pipe, and a purging control valve is arranged on the purging pipe.
Further, the number of the feeding pumps is two, and the two feeding pumps are arranged in parallel.
Compared with the prior art, the utility model has the following technical advantages:
according to the urea pyrolysis ammonia production system for SCR denitration, provided by the utility model, no urea solution residue is generated in a pipeline of the system no matter in a production or stop state by adding the automatic flushing module, so that urea crystallization in the pipeline is avoided, and the urea solution can enter a urea pyrolysis chamber at a stable flow rate.
Drawings
FIG. 1 is a schematic diagram of a urea pyrolysis ammonia production system for SCR denitration according to the present utility model;
wherein the reference numerals are as follows:
a urea feed tank 1; flushing the valve group 2 with clear water; urea solution feeding valve group 3; a feed pump 4; a urea solution return valve 5; a pressure stabilizing reflux control valve 6; a urea solution pressure gauge 7; a urea solution flowmeter 8; a urea solution flow regulating valve 9; a compressed air flowmeter 10; a compressed air flow rate regulating valve 11; a urea pyrolysis chamber 12; a two-fluid atomizer 13; a purge control valve 14; a purge pipe 15; a compressed air pressure gauge 16.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
Referring to fig. 1, the embodiment provides a urea pyrolysis ammonia production system for SCR denitration, which comprises a urea solution feeding module, a urea flow regulating module, a urea solution injection module and a control system which are sequentially communicated through pipelines, wherein the urea solution feeding module comprises a urea feeding tank 1, a urea solution feeding valve group 3 and a feeding pump 4, an outlet end of the urea feeding tank 1 is connected with an inlet end of the feeding pump 4 through the urea solution feeding valve group 3, and an automatic clear water flushing module is arranged between an outlet end of the urea solution feeding valve group 3 and an inlet end of the feeding pump 4; the automatic clear water flushing module comprises a clear water flushing valve group 2, the clear water flushing valve group 2 is respectively connected with the outlet end of the urea solution feeding valve group 3 and the inlet end of the feeding pump 4, and the clear water flushing valve group 2 comprises a clear water supplementing automatic cut-off valve and a check valve.
In this embodiment, the urea flow regulating module includes a regulated pressure backflow control valve 6, a urea solution pressure gauge 7, a urea solution flow meter 8, and a urea solution flow regulating valve 9.
In this embodiment, the urea solution injection module comprises a urea pyrolysis chamber 12 and a two-fluid atomizer 13, the two-fluid atomizer 13 being mounted in the urea pyrolysis chamber 12.
In this embodiment, an inlet end of the urea feed tank 1 is connected with the urea flow regulating module through a pipeline provided with a urea solution backflow valve 5, and by regulating the opening of the urea solution backflow valve 5, the urea feed tank is interlocked with the pressure entering the urea flow regulating valve 9 (the interlocking control among the urea solution pressure gauge 7, the urea solution backflow valve 5 and the urea flow regulating valve 9 is the prior art), so that the pressure before entering the urea flow regulating valve 9 is maintained to be constant, the regulating and controlling precision of the valve is ensured, the urea use flow is stably and accurately controlled, and the efficiency of the denitration system and the lowest ammonia escape rate are ensured.
In this embodiment, an atomization compressed air conditioning module is disposed between the urea solution flow rate adjusting valve 9 and the urea solution injection module, and the atomization compressed air conditioning module includes a compressed air flow meter 10, a compressed air flow rate adjusting valve 11, and a compressed air pressure gauge 16. The urea flow regulating module is used for regulating the synchronous flow of the urea solution and the atomization compressed air regulating module to enter the two-fluid atomizer 13, and the urea solution is injected into the urea pyrolysis chamber 12 to be pyrolyzed to prepare ammonia under the action of the two-fluid atomizer 13.
In this embodiment, the atomization compressed air conditioning module is connected to the outlet of the feed pump 4 through a purge pipe 15, and a purge control valve 14 is disposed on the purge pipe 15.
In this embodiment, the control system is electrically connected with the feed pump 4, the urea solution reflux valve 5, the regulated pressure reflux control valve 6, the urea solution pressure gauge 7, the urea solution flowmeter 8, the urea solution flow rate regulating valve 9, the compressed air flowmeter 10, the compressed air flow rate regulating valve 11, the purge control valve 14 and the compressed air pressure gauge 1, and the control system is in the prior art.
As a preferred example, the number of the feeding pumps 4 is two, and the two feeding pumps 4 are arranged in parallel.
The SCR denitration urea pyrolysis ammonia production system provided by the utility model operates:
the urea solution in the urea feed tank 1 is sequentially conveyed to a two-fluid atomizer 13 through a urea solution feed valve group 3, a feed pump 4, a urea solution reflux valve 5, a pressure stabilizing reflux control valve 6, a urea solution pressure gauge 7, a urea solution flowmeter 8 and a urea solution flow regulating valve 9, and then the urea solution is injected into a urea pyrolysis chamber 12 to be pyrolyzed to prepare ammonia under the action of the two-fluid atomizer 13.
And when the machine is stopped each time, the control system automatically starts a cleaning mode: the urea solution feeding valve group 3, the urea solution feeding pump 4 and the urea solution reflux valve 5 are automatically closed, the clean water flushing valve group 2 is automatically opened to a set time and then closed, the urea solution remained in the pipe is replaced to the urea cracking chamber 12 of the denitration device, and the urea solution is evaporated and decomposed by utilizing waste heat. The clean water flushing through the whole flow of the pipeline can ensure that the pipeline basically has no urea residue in the system shutdown state, and in addition, when the system is shut down for a long time, the compressed air purging valve 14 on the purging pipe 15 can be manually opened to purge the solution in the pipeline.
Wherein, by adjusting the opening of the urea solution flow regulating valve 9 and the atomization compressed air regulating valve 11, the pressure ratio of the control compressed air and the urea solution is about: 0.8-1.2; the volume ratio of the control compressed air flowmeter 10 to the urea solution flowmeter 8 is: 400-600. Under these conditions it is ensured that the urea is optimally atomized when entering the two-fluid atomizer 13.
In summary, according to the urea pyrolysis ammonia production system for SCR denitration provided by the utility model, the automatic flushing module and the return pipe are added to ensure that no urea solution remains in the pipeline of the system in the production or stop state, so that urea crystallization in the pipeline is avoided, and the stable flow of urea solution can be ensured to enter the urea pyrolysis chamber.
The foregoing description is only illustrative of the preferred embodiments of the present utility model and is not to be construed as limiting the scope of the utility model, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present utility model, and are intended to be included within the scope of the present utility model.
Claims (8)
1. The urea pyrolysis ammonia production system for SCR denitration comprises a urea solution feeding module, a urea flow regulating module, a urea solution injection module and a control system which are communicated sequentially through pipelines, and is characterized in that the urea solution feeding module comprises a urea feeding tank (1), a urea solution feeding valve group (3) and a feeding pump (4), the outlet end of the urea feeding tank (1) is connected with the inlet end of the feeding pump (4) through the urea solution feeding valve group (3), and an automatic clear water flushing module is arranged between the outlet end of the urea solution feeding valve group (3) and the inlet end of the feeding pump (4); the automatic clear water flushing module comprises a clear water flushing valve group (2), and the clear water flushing valve group (2) is respectively connected with the outlet end of the urea solution feeding valve group (3) and the inlet end of the feeding pump (4); the clean water flushing valve group (2) comprises a clean water supplementing automatic cut-off valve and a check valve.
2. Urea pyrolysis ammonia production system for SCR denitration according to claim 1, characterized in that the urea flow regulation module comprises a regulated pressure reflux control valve (6), a urea solution pressure gauge (7), a urea solution flow meter (8) and a urea solution flow regulation valve (9).
3. Urea pyrolysis ammonia production system for SCR denitration according to claim 1, characterized in that the urea solution injection module comprises a urea pyrolysis chamber (12) and a two fluid atomizer (13), the two fluid atomizer (13) being mounted in the urea pyrolysis chamber (12).
4. Urea pyrolysis ammonia system for SCR denitration according to claim 1, characterized in that an inlet end of the urea feed tank (1) is connected to the urea flow regulating module by means of a pipe provided with a urea solution return valve (5).
5. Urea pyrolysis ammonia production system for SCR denitration according to claim 2, characterized in that an atomized compressed air conditioning module is provided between the urea solution flow regulating valve (9) and the urea solution injection module.
6. Urea pyrolysis ammonia production system for SCR denitration according to claim 5, characterized in that the atomizing compressed air conditioning module comprises a compressed air flow meter (10), a compressed air flow regulating valve (11) and a compressed air pressure meter (16).
7. Urea pyrolysis ammonia production system for SCR denitration according to claim 5 or 6, characterized in that the atomizing compressed air conditioning module is connected to the outlet of the feed pump (4) through a purge pipe (15), the purge pipe (15) being provided with a purge control valve (14).
8. Urea pyrolysis ammonia production system for SCR denitration according to claim 1, characterized in that the feed pumps (4) are two and the two feed pumps (4) are arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320777224.8U CN219400178U (en) | 2023-04-11 | 2023-04-11 | Urea pyrolysis ammonia production system for SCR denitration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320777224.8U CN219400178U (en) | 2023-04-11 | 2023-04-11 | Urea pyrolysis ammonia production system for SCR denitration |
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| CN219400178U true CN219400178U (en) | 2023-07-25 |
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| CN202320777224.8U Active CN219400178U (en) | 2023-04-11 | 2023-04-11 | Urea pyrolysis ammonia production system for SCR denitration |
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