CN217928256U - Ammonia supply system for denitration SCR (selective catalytic reduction) area of unit - Google Patents
Ammonia supply system for denitration SCR (selective catalytic reduction) area of unit Download PDFInfo
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- CN217928256U CN217928256U CN202221827224.6U CN202221827224U CN217928256U CN 217928256 U CN217928256 U CN 217928256U CN 202221827224 U CN202221827224 U CN 202221827224U CN 217928256 U CN217928256 U CN 217928256U
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Abstract
And an ammonia supply system for the denitration SCR area of the unit. Among the existing equipment, the ammonia purification valve of the mother pipe from the liquid ammonia storage tank to the outlet of the ammonia buffer tank has no pressure regulation function, and can not meet the stable operation requirement of the ammonia supply pressure of the unit SCR region under any working condition and season condition. The utility model discloses constitute including liquid ammonia storage tank (6), discharge compressor (8) and ammonia buffer tank (1), the ammonia buffer tank reserve the mouth with the entry of the compressor of unloading between communicate through contact pipeline (5), the export of the compressor of unloading with the air inlet of liquid ammonia storage tank pass through air supply line (7) intercommunication. The utility model is used for unit denitration SCR district supplies ammonia.
Description
The technical field is as follows:
the invention relates to the technical field of environmental protection denitration of liquid ammonia, in particular to an ammonia supply system of a unit denitration SCR (selective catalytic reduction) zone.
The background art comprises the following steps:
the steam pipeline of the ammonia zone evaporation tank is designed to be a single-line running standby-free steam pipeline. The steam is used as the only heat source of the evaporation tank in the ammonia area, and the liquid ammonia can be gasified into ammonia gas by absorbing the heat of the steam. When ammonia district evaporation tank adopted steam heating and for the single line steam pipe way, if the evaporation tank will normally be put into operation because of losing the heat source when the steam pipe line takes place unusually, the evaporation tank will be forced to withdraw from the operation, and ammonia buffer tank pressure also will normally not be supplied with, does not guarantee unit deNOx systems normal operating.
In winter, the liquid level of the liquid ammonia storage tank is lower than 1.5 meters or the outdoor environment temperature is low (when the environment temperature is-5 to-30 ℃), the pressure of the liquid ammonia storage tank is reduced to 0.25MPa or below, the pressure of an ammonia supply main pipe in the SCR region is lower than 0.10MPa, and a pneumatic door before an ammonia spraying valve in the denitration region is automatically alarmed and interlocked to be closed, so that the denitration ammonia spraying system in the SCR region is quitted to operate. When the liquid ammonia delivery pump is adopted to pressurize the liquid ammonia in the ammonia supply pipeline, the liquid ammonia delivery pump has to quit operation and maintenance due to frequent leakage defect caused by pressure build-up, cavitation and other reasons, at the moment, the pressure instability of an ammonia main pipe in an SCR region can be influenced by the ammonia pressure of a liquid ammonia evaporation tank (vaporizer), a denitration system is quitted to operate, and a unit is subject to load reduction or possibly causes the emission of environmental pollutants to exceed the standard and is checked and blamed by an environmental protection department.
Liquid ammonia (anhydrous ammonia) has high volatility, the pressure of a liquid ammonia storage tank is continuously increased (the action pressure of a safety valve of the liquid ammonia storage tank is 2.16 MPa) due to the fact that heat in the environment is continuously absorbed and gasified along with the increase of the environmental temperature, and according to the technical requirements of the operation regulations of the liquid ammonia storage tank in an ammonia area, when the temperature of the liquid ammonia storage tank is more than or equal to 40 ℃ or the pressure of the liquid ammonia storage tank is more than or equal to 1.6MPa, the liquid ammonia storage tank needs to be sprayed (industrial water) for cooling and depressurization, so that the liquid ammonia storage tank is ensured to operate at non-overpressure and over-temperature (the technical requirements of the operation regulations).
Among the existing equipment, the ammonia purification valve of liquid ammonia storage tank to ammonia buffer tank export mother pipe does not have pressure regulating function, when any operating mode and seasonal condition, all can't satisfy the unit SCR district and supply the steady operation requirement of ammonia pressure.
The utility model has the following contents:
the utility model aims at solving the problem of above-mentioned existence, provide a unit denitration SCR district and supply ammonia system.
The above purpose is realized by the following technical scheme:
the ammonia supply system for the denitration SCR area of the unit comprises a liquid ammonia storage tank, a discharge compressor and an ammonia buffer tank, wherein a reserved opening of the ammonia buffer tank is communicated with an inlet of the discharge compressor through a communication pipeline, and an outlet of the discharge compressor is communicated with an air inlet of the liquid ammonia storage tank through an air supply pipeline.
The unit denitration SCR district supply ammonia system, the connecting line on install hand-operated gate, pneumatic fast valve and governing valve.
Has the beneficial effects that:
1. the utility model discloses the reservation mouth of ammonia buffer tank installs the contact pipeline additional with the compressor entry of unloading, makes ammonia buffer tank and liquid ammonia storage tank gas phase pipeline be linked together. When ambient temperature changes and system pressure changes, can open manual door, quick-closing valve and the governing valve on this pipeline, start the compressor operation of unloading, with leading-in liquid ammonia storage tank after ammonia boosts through the compression in the ammonia buffer tank, increase liquid ammonia storage tank pressure. According to the pressure rise of the pipeline to the liquid ammonia storage tank, the ammonia supply of the liquid ammonia evaporation tank is ensured to be normal, the pressure of the buffer tank is ensured to be 0.15-0.24 MPa, and the ammonia supply pressure of the denitration SCR area of the unit can stably run.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention;
in the figure: 1. an ammonia buffer tank; 2. a manual door; 3. a pneumatic quick-closing valve; 4. adjusting a valve; 5. a communication pipeline; 6. a liquid ammonia storage tank; 7. a gas supply line; 8. a discharge compressor; 9. a liquid ammonia evaporation tank; 10. and (6) connecting the door.
The specific implementation mode is as follows:
referring to fig. 1, the ammonia supply system for the denitration SCR area of the unit comprises a liquid ammonia storage tank 6, a discharge compressor 8 and an ammonia buffer tank 1, wherein a reserved opening of the ammonia buffer tank is communicated with an inlet of the discharge compressor through a connecting pipeline 5, and an outlet of the discharge compressor is communicated with an air inlet of the liquid ammonia storage tank through an air supply pipeline 7.
The utility model discloses a contact pipeline is installed additional with the compressor entry of unloading to the reservation mouth of ammonia buffer tank, makes ammonia buffer tank and liquid ammonia storage tank gas phase pipeline be linked together. When ambient temperature changes and system pressure changes, can open manual door 2, quick-closing valve 3 and governing valve 4 on this pipeline, start the compressor operation of unloading, with ammonia in the ammonia buffer tank leading-in liquid ammonia storage tank after stepping up through the compression, increase liquid ammonia storage tank pressure. According to the pressure rise of the pipeline to the liquid ammonia storage tank, the ammonia supply of the liquid ammonia evaporation tank is ensured to be normal, the pressure of the buffer tank is ensured to be 0.15-0.24 MPa, and the ammonia supply pressure of the denitration SCR area of the unit can stably run.
During normal operation in summer: liquid ammonia storage tank → liquid ammonia evaporation tank → ammonia buffer tank → to boiler side SCR region;
the use process and the function are as follows:
in winter and spring, the liquid level of the liquid ammonia storage tank is lower than 1.5 meters or the pressure of the liquid ammonia storage tank is reduced to 0.24MPa, at the moment, the ammonia purification valve of the liquid ammonia storage tank supplies ammonia to the SCR region through the ammonia buffer tank outlet main pipe, and the liquid ammonia pump cannot run due to leakage or other defects, the standby evaporation tank can be put into operation, the standby side ammonia buffer tank outlet door is closed, the standby ammonia buffer tank is opened, the ammonia buffer tank is connected to the unloading compressor inlet adjusting valve, the manual isolating valve is arranged at the inlet of the unloading compressor after the adjusting valve, the ammonia pipeline connecting doors 10 of the two unloading compressors are closed, one of the inlet doors of the unloading compressors and the ammonia outlet pneumatic valve and the manual valve of the running liquid ammonia storage tank are opened. When the pressure of the standby ammonia buffer tank is equal to or close to the pressure of the running liquid ammonia storage tank, starting the unloading compressor to pump the ammonia in the ammonia buffer tank after pressurization and temperature rise to the running liquid ammonia storage tank, and gradually starting to slowly rise the pressure and the temperature of the liquid ammonia storage tank to about 0.8 MPa. The pressure of a liquid ammonia evaporation tank (vaporizer) and an ammonia buffer tank in operation is increased gradually to 0.26MPa by the pressure of a liquid ammonia storage tank, the opening degree of a liquid ammonia valve at an inlet of the liquid ammonia evaporation tank (vaporizer) is gradually reduced, and the pressure of ammonia from an outlet mother pipe of the ammonia buffer tank to an SCR area is also increased and tends to be stable, so that normal ammonia supply of a unit is ensured. When the pressure of the liquid ammonia storage tank is increased to 0.8MPa, the operation of the unloading compressor can be stopped, and when the pressure of the liquid ammonia storage tank is reduced to 0.3 MPa, the operation of the unloading compressor is started. The compressor of unloading under this operating mode can use PLC to carry out program control, can realize according to the liquid ammonia storage tank pressure automatic start in the operation, so can ensure liquid ammonia storage tank pressure and SCR district and supply ammonia pressure steady operation reciprocating.
Summer, when autumn festival ambient temperature is high, influenced by ambient temperature, if liquid ammonia storage tank pressure reaches 1.0MPa or liquid ammonia storage tank temperature reaches 40 ℃, can open liquid ammonia storage tank ammonia export manual door, ammonia export pneumatic valve, compressor ammonia pipeline of unloading contact door, the manual isolating valve behind ammonia buffer tank to the compressor entry governing valve of unloading, reserve ammonia buffer tank reserve mouth department manual door, the manual door of reserve ammonia buffer tank export, according to liquid ammonia storage tank pressure, reserve side ammonia buffer tank pressure and unit SCR district supply ammonia mother's pipe pressure, through adjusting ammonia buffer tank to the compressor entry governing valve aperture of unloading, reach and reduce liquid ammonia storage tank pressure (or liquid ammonia storage tank temperature), increase ammonia buffer tank pressure, stabilize SCR district supply ammonia mother's pipe pressure, ensure that the liquid ammonia storage tank is not superpressure, do not overtemperature's operation.
When the ammonia storage tank operates under the working condition, the ammonia buffer tank can adopt PLC program control to the inlet regulating valve of the unloading compressor, the pressure and the temperature of the liquid ammonia storage tank and the pressure of the ammonia buffer tank on the standby side are introduced for logic control, and the regulating valve can realize automatic control so as to meet the requirement of stable operation of the pressure and the temperature of the liquid ammonia storage tank and the pressure of the ammonia supply main pipe in the SCR area.
Claims (2)
1. The ammonia supply system for the denitration SCR area of the unit comprises a liquid ammonia storage tank, a discharging compressor and an ammonia buffer tank, and is characterized in that: the reserved opening of the ammonia buffer tank is communicated with the inlet of the unloading compressor through a communication pipeline, and the outlet of the unloading compressor is communicated with the air inlet of the liquid ammonia storage tank through an air supply pipeline.
2. The unit denitration SCR area ammonia supply system of claim 1, wherein: and the connecting pipeline is provided with a manual valve, a pneumatic quick-closing valve and a regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221827224.6U CN217928256U (en) | 2022-07-16 | 2022-07-16 | Ammonia supply system for denitration SCR (selective catalytic reduction) area of unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221827224.6U CN217928256U (en) | 2022-07-16 | 2022-07-16 | Ammonia supply system for denitration SCR (selective catalytic reduction) area of unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217928256U true CN217928256U (en) | 2022-11-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221827224.6U Active CN217928256U (en) | 2022-07-16 | 2022-07-16 | Ammonia supply system for denitration SCR (selective catalytic reduction) area of unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217928256U (en) |
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2022
- 2022-07-16 CN CN202221827224.6U patent/CN217928256U/en active Active
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| TR01 | Transfer of patent right |
Effective date of registration: 20230926 Address after: 831100 Huadian Hutubi Energy Co., Ltd. Thermal Power Plant, West Side of Longwangmiao Road, Wugongtai Town, Hutubi County, Changji Hui Autonomous Prefecture, Xinjiang Uygur Autonomous Region Patentee after: Huadian Hutubi Energy Co.,Ltd. Address before: 831200 West of Longwangmiao Road, Wugongtai Town, Hutubi County, Changji Hui Autonomous Prefecture, Xinjiang Uygur Autonomous Region Patentee before: Thermal power plant of Huadian Hutubi Energy Co.,Ltd. |