CN203703140U - Nitrogen sealing device - Google Patents
Nitrogen sealing device Download PDFInfo
- Publication number
- CN203703140U CN203703140U CN201420067508.9U CN201420067508U CN203703140U CN 203703140 U CN203703140 U CN 203703140U CN 201420067508 U CN201420067508 U CN 201420067508U CN 203703140 U CN203703140 U CN 203703140U
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- nitrogen
- pressure
- low
- pressure nitrogen
- pid controller
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Abstract
Disclosed is a nitrogen sealing device. The nitrogen sealing device comprises a nitrogen source, a high-pressure nitrogen conveying part, a low-pressure nitrogen conveying part, a nitrogen exhausting part, a control part and a PID controller. The high-pressure nitrogen conveying part is connected with the nitrogen source and enables the nitrogen source to be conveyed to the position of the inner sealed edge of a shaft neck of a cylinder. The low-pressure nitrogen conveying part is connected with the high-pressure nitrogen conveying part, and reduces the pressure of high-pressure nitrogen to enable the high-pressure nitrogen to be low-pressure nitrogen to be conveyed to the position of the outer sealed edge of the shaft neck of the cylinder. The nitrogen exhausting part exhausts the nitrogen out through a diffusion pipeline, wherein the nitrogen is led out from the position of the sealed middle section of the shaft neck. The control part comprises a pressure difference control part controlling the pressure value of the high-pressure nitrogen and the pressure value of the low-pressure nitrogen. The PID controller is connected with the pressure difference control part and the PID controller feeds back control signals to a nitrogen regulating valve. By using the nitrogen sealing device, fuel gas zero leakage of a compressor is realized, the problem of sealing of the rotation shaft neck position of the combustible and poisonous gas compressor is solved, and the nitrogen sealing device has important significance for unit safety operation, staff occupational health and environmental protection.
Description
Technical field
The utility model relates to steam electric power technical field, especially relates to a kind ofly being regulated pressure reduction, complete between pivot journal and compressor housing sealing, being guaranteed the nitrogen gas seal equipment of coal gas zero leakage by setting.
Background technique
Gas-steam Combined Cycle generating is that the exhaust of gas turbine is introduced to exhaust heat boiler, the high temperature of generation, high pressure steam driving steam turbine, and drive steam turbine generator generating.Because its fuel system adopts mixed gas compressor, be industrial gas to be brought up to 2.35Mpa supply with the gas turbine production of generating electricity, gas compression pump is three sections of 10 grades of compact models of two cylinders.Gas enters first paragraph cooler and gas-liquid separator at low pressure (LP) cylinder after one section 3 grades compressions in parallel, then enter high-pressure cylinder second segment and enter two-step cooling device after 3 grades of compressions, again after the 3rd section of 4 grades of compressions to discharge state, rated point place discharge state gas pressure is 2.35Mpa ± 0.05 Mpa, and gas temperature is 235 DEG C ± 10 DEG C.Owing to adopting double-cylinder structure, the entrance of entrance, outlet and the high-pressure cylinder of low pressure (LP) cylinder, outlet only adopt conventional balanced dish to add labyrinth sealing mode and have the disadvantage that gas leakage is serious, unit cannot normally be worked in pivot journal place.
Summary of the invention
The purpose of this utility model is to overcome the shortcoming existing in prior art, a kind of nitrogen gas seal equipment of realizing coal gas zero leakage of introducing by nitrogen is provided, the technological scheme adopting is: a kind of nitrogen gas seal equipment, is characterized in that: described seal arrangement comprises: source nitrogen; Be connected, source nitrogen be delivered to the high pressure nitrogen transport portion at cylinder body journal packing inner edge place with source nitrogen; Be connected, formation low-pressure nitrogen after high pressure nitrogen decompression be delivered to the low-pressure nitrogen transport portion at cylinder body journal packing outer rim place with high pressure nitrogen transport portion; The nitrogen that journal packing middle section is drawn is through the outer row's of diffuse channel nitrogen discharge part; Control section, described control section comprises the pressure reduction controlling component of controlling described high pressure nitrogen and low-pressure nitrogen force value size, with the PID controller that described pressure reduction controlling component is connected, control signal is fed back to nitrogen adjustment valve by PID controller.
Technical characteristics of the present utility model also has: described pressure reduction controlling component is pressure difference transmitter.
The beneficial effects of the utility model are: in order to solve the gas leakage problem existing in gas compression pump, on conventional balanced Pan Jia labyrinth sealing mechanism basis, increase this nitrogen gas seal equipment, prevent that by passing into of high pressure nitrogen coal gas is from cylinder body toward external leakage, and the use of PID controller realizes the real-time detection of controlling and has automatically regulated.Use of the present utility model has realized the zero leakage of compressor coal gas, has solved a difficult problem flammable, the sealing of toxic gas compressor rotating shaft neck place, and realization, employee's occupational health and environmental protection to unit safety operation are significant.
Brief description of the drawings
Accompanying drawing 1 is the utility model structural representation, wherein 1 is low pressure (LP) cylinder entry end, the 2nd, low pressure (LP) cylinder outlet end, the 3rd, high-pressure cylinder entry end, the 4th, high-pressure cylinder outlet end, the 5th, Balance disc and be located at the labyrinth sealing mechanism on Balance disc, the 6th, source nitrogen, the 7th, diffuse female pipe, the 8th, PID controller I, the 9th, pressure difference transmitter I, the 10th, pressure difference transmitter II, the 11st, nitrogen adjustment valve I, the 12nd, nitrogen adjustment valve II, the 13rd, nitrogen adjustment valve III, the 14th, PID controller II, the 15th, PID controller III, the 16th, low pressure (LP) cylinder, the 17th, high-pressure cylinder, the 18th, pressure difference transmitter.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described.The utility model discloses a kind of nitrogen gas seal equipment, this application of installation on the gas centrifugal formula compressor at 2-3Mpa, for the sealing between pivot journal and compressor housing, regulates pressure reduction by setting at outlet pressure, guarantees coal gas zero leakage.Specifically comprise: source nitrogen 6; The high pressure nitrogen transport portion being connected with source nitrogen 6, nitrogen is delivered to cylinder body journal packing inner edge place by high pressure nitrogen transport portion; Formation low-pressure nitrogen after high pressure nitrogen decompression is delivered to the low-pressure nitrogen transport portion at cylinder body journal packing outer rim place; Nitrogen discharge part, the nitrogen that nitrogen discharge part is drawn journal packing middle section is through diffusing female pipe 7 outer rows; Control section, control section comprises the pressure reduction controlling component of controlling high pressure nitrogen and low-pressure nitrogen force value size, the PID controller being connected with pressure reduction controlling component, control signal is fed back to nitrogen adjustment valve by PID controller.In the present embodiment, pressure reduction controlling component is pressure difference transmitter.
When use, high pressure nitrogen is delivered to after nitrogen adjustment valve to the cylinder body journal packing inner edge of low pressure (LP) cylinder 16 and high-pressure cylinder 17 from source nitrogen 6, elevated pressure nitrogen source of the gas is delivered to the cylinder body journal packing outer rim place of low pressure (LP) cylinder 16 and high-pressure cylinder 17 after decompression, and detect the force value at cylinder body journal packing inner edge place and cylinder body journal packing outer rim place by pressure difference transmitter, force value is flowed to PID controller by pressure difference transmitter, and realize and regulating according to the output control nitrogen adjustment valve detecting by PID control device, arrange except the nitrogen of drawing is after diffusing female pipe 7 from journal packing stage casing.When actual use, the high pressure nitrogen force value passing into should exceed certain numerical value than the force value of leakage gas, general approximately 60,000 Pa.
This device not only can be used on the multistage gas compression pump of twin-tub, certainly also can be applicable on other machines with similar structure and application requirements.
Certainly; above-mentioned explanation is not limitation of the utility model; the utility model is also not limited only to above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art make in essential scope of the present utility model, also belong to protection domain of the present utility model.
Claims (2)
1. a nitrogen gas seal equipment, is characterized in that: described seal arrangement comprises: source nitrogen; Be connected, source nitrogen be delivered to the high pressure nitrogen transport portion at cylinder body journal packing inner edge place with source nitrogen; Be connected, formation low-pressure nitrogen after high pressure nitrogen decompression be delivered to the low-pressure nitrogen transport portion at cylinder body journal packing outer rim place with high pressure nitrogen transport portion; The nitrogen that journal packing middle section is drawn is through the outer row's of diffuse channel nitrogen discharge part; Control section, described control section comprises the pressure reduction controlling component of controlling described high pressure nitrogen and low-pressure nitrogen force value size, with the PID controller that described pressure reduction controlling component is connected, control signal is fed back to nitrogen adjustment valve by PID controller.
2. according to nitrogen gas seal equipment claimed in claim 1, it is characterized in that: described pressure reduction controlling component is pressure difference transmitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420067508.9U CN203703140U (en) | 2014-02-17 | 2014-02-17 | Nitrogen sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420067508.9U CN203703140U (en) | 2014-02-17 | 2014-02-17 | Nitrogen sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203703140U true CN203703140U (en) | 2014-07-09 |
Family
ID=51053585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420067508.9U Expired - Fee Related CN203703140U (en) | 2014-02-17 | 2014-02-17 | Nitrogen sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203703140U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113594528A (en) * | 2021-07-27 | 2021-11-02 | 上海恒劲动力科技有限公司 | High-voltage operation system and method of electric pile system |
-
2014
- 2014-02-17 CN CN201420067508.9U patent/CN203703140U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113594528A (en) * | 2021-07-27 | 2021-11-02 | 上海恒劲动力科技有限公司 | High-voltage operation system and method of electric pile system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20200217 |