CN215170223U - Cogeneration system - Google Patents
Cogeneration system Download PDFInfo
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- CN215170223U CN215170223U CN202121057259.1U CN202121057259U CN215170223U CN 215170223 U CN215170223 U CN 215170223U CN 202121057259 U CN202121057259 U CN 202121057259U CN 215170223 U CN215170223 U CN 215170223U
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- pressure cylinder
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
Abstract
The utility model discloses a combined heat and power generation system specifically is newly-increased peak shaver high-pressure bypass all the way between two high-pressure jar steam input pipelines and two high-pressure jar steam output pipelines, with intermediate pressure jar steam output pipeline connection heating connecting line, newly-increased peak shaver low pressure bypass all the way between two intermediate pressure jar steam input pipelines and heating connecting line, with heating connecting line and heating tube coupling, two intermediate pressure jar steam input pipelines are connected with start low pressure bypass through starting low side connecting line, start low pressure bypass and industry extraction steam line connection. The utility model discloses when the degree of depth peak shaving reduces the power generation load, can satisfy industry air feed demand, can provide higher heating heat supply again, realized the participation effect of the degree of depth peak shaving of steam power plant, avoided the harmful effects that boiler low-load burning brought under the current peak shaving operating mode, solved under the peak shaving operating mode that the industry was taken out vapour and the nervous condition of heat supply.
Description
Technical Field
The utility model relates to a cogeneration technical field of thermal power plant, concretely relates to cogeneration system.
Background
The cogeneration project was primarily applied in the industrial field at the earliest time, and then developed to the central heating of residents. In recent years, cogeneration projects in various regions are built and put into production, so that the urban heat supply capacity of China is continuously improved.
The temperature is lower in winter in northern China, the heat supply of a cogeneration system needs to be increased along with the reduction of the environmental temperature, and the electric load is increased along with the increase of the heat supply of the cogeneration system. Under the deep peak regulation working condition of the thermal power plant, the thermal power generating unit needs to reduce the power generation load, the reduction of the power generation load on the traditional technical level can influence the heat supply output, and the industrial steam supply amount is reduced.
Therefore, how to reduce the power generation load when the degree of depth peak regulation, when satisfying the degree of depth peak regulation operating mode requirement, can satisfy industry air feed demand, can provide higher heat supply again, be the technical problem that needs solve at present urgently.
Disclosure of Invention
The utility model aims at overcoming the not enough of prior art existence, provide a combined heat and power generation system, it can satisfy industry air feed demand when the degree of depth peak shaving reduces the electricity generation load, can provide higher heat supply again.
The utility model aims at realizing through the following technical scheme: a combined heat and power generation system comprises a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder, wherein an upper steam inlet and a lower steam inlet of the high-pressure cylinder are connected with an upper high-pressure cylinder steam input pipeline and a lower high-pressure cylinder steam input pipeline, two steam outlets of the high-pressure cylinder steam input pipeline and the two high-pressure cylinder steam output pipelines are connected with a starting high-pressure bypass, the high-pressure cylinder steam output pipeline is connected with a steam inlet of a boiler reheater, an upper steam inlet and a lower steam inlet of the intermediate-pressure cylinder are connected with an upper intermediate-pressure cylinder steam input pipeline and a lower intermediate-pressure cylinder steam input pipeline, a steam outlet of the boiler reheater is connected with the intermediate-pressure cylinder steam input pipeline, a steam outlet of the intermediate-pressure cylinder is connected with an intermediate-pressure cylinder steam output pipeline, a steam inlet of the low-pressure cylinder is connected with a low-pressure cylinder steam input pipeline, and the intermediate-pressure cylinder steam output pipeline is connected with the low-pressure cylinder steam input pipeline, two high pressure cylinder steam input pipeline and two be connected with the peak shaver high pressure bypass between the high pressure cylinder steam output pipeline, heating connecting line is connected to the intermediate pressure cylinder steam output pipeline, two the intermediate pressure cylinder steam input pipeline with be connected with the peak shaver low pressure bypass between the heating connecting line, heating connecting line and heating pipe connection, two the intermediate pressure cylinder steam input pipeline is connected with a start low pressure bypass through starting low side connecting line, start low pressure bypass and industry extraction pipeline connection.
The starting high-pressure bypass is provided with a first desuperheater and a starting high-pressure bypass valve.
The peak-shaving high-pressure bypass is provided with a second desuperheater and a peak-shaving high-pressure bypass valve.
The peak-regulating low-pressure bypass is provided with a fourth desuperheater and a peak-regulating low-bypass valve.
The starting low-pressure bypass is provided with a third desuperheater, and the starting low-bypass connecting pipeline is provided with a starting low-bypass valve.
And a low-pressure cylinder steam inlet adjusting valve is arranged between the low-pressure cylinder steam input pipeline and the steam inlet of the low-pressure cylinder.
The heating connecting pipeline is provided with a heating connecting valve.
The utility model has the advantages that: the utility model discloses when the degree of depth peak shaving reduces the power generation load, can satisfy industry air feed demand, can provide higher heating heat supply again, realized the participation effect of the degree of depth peak shaving of steam power plant, avoided the harmful effects that boiler low-load burning brought under the current peak shaving operating mode, solved under the peak shaving operating mode that the industry was taken out vapour and the nervous condition of heat supply.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1-a high pressure cylinder; 2-intermediate pressure cylinder; 3-low pressure cylinder; 4-high pressure cylinder steam input pipeline; 5-high pressure cylinder steam output pipeline; 6-steam input pipeline of intermediate pressure cylinder; 7-intermediate pressure cylinder steam output pipeline; 8-low pressure cylinder steam input pipeline; 9-low pressure cylinder steam input valve; 10-heating connecting pipeline; 11-heating connecting valve; 12-starting a high-pressure bypass; 13-a first desuperheater; 14-starting a high bypass valve; 15-peak regulation high pressure bypass; 16-a second desuperheater; 17-peak regulation high-side valve; 18-start low pressure bypass; 19-a third desuperheater; 20-starting a low bypass valve; 21-peak shaving low pressure bypass; 22-a fourth desuperheater; 23-peak regulation low-side valve; 24-an industrial extraction line; 25-heating pipeline; 26-starting a low bypass connecting pipeline; 27-a middle pressure cylinder steam inlet adjusting valve.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, a cogeneration system comprises a high pressure cylinder 1, an intermediate pressure cylinder 2 and a low pressure cylinder 3, wherein the upper and lower steam inlets of the high pressure cylinder 1 are connected with an upper and a lower high pressure cylinder steam input pipeline 4, the two steam outlets of the high pressure cylinder 1 are connected with two high pressure cylinder steam output pipelines 5, a starting high pressure bypass 12 is connected between the two high pressure cylinder steam input pipelines 4 and the two high pressure cylinder steam output pipelines 5, the high pressure cylinder steam output pipeline 5 is connected with a steam inlet of a boiler reheater, the upper and lower steam inlets of the intermediate pressure cylinder 2 are connected with an upper and a lower intermediate pressure cylinder steam input pipelines 6, a steam outlet of the boiler reheater is connected with an intermediate pressure cylinder steam input pipeline 6, the steam outlet of the intermediate pressure cylinder 2 is connected with an intermediate pressure cylinder steam output pipeline 7, the steam inlet of the low pressure cylinder 3 is connected with a low pressure cylinder steam input pipeline 8, and the intermediate pressure cylinder steam output pipeline 7 is connected with a low pressure cylinder steam input pipeline 8, the peak-shaving high-pressure bypass 15 is connected between the two high-pressure cylinder steam input pipelines 4 and the two high-pressure cylinder steam output pipelines 5, the intermediate-pressure cylinder steam output pipeline 7 is connected with the heating connecting pipeline 10, the peak-shaving low-pressure bypass 21 is connected between the two intermediate-pressure cylinder steam input pipelines 6 and the heating connecting pipeline 10, the heating connecting pipeline 10 is connected with the heating pipeline 25, the two intermediate-pressure cylinder steam input pipelines 6 are connected with a starting low-pressure bypass 18 through a starting low-pressure bypass connecting pipeline 26, and the starting low-pressure bypass 18 is connected with an industrial steam extraction pipeline 24.
Referring to fig. 1, the startup high pressure bypass 12 is provided with a first desuperheater 13 and a startup high bypass valve 14. The peak shaver high pressure bypass 15 is provided with a second desuperheater 16 and a peak shaver high bypass valve 17. The peaking low pressure bypass 21 is provided with a fourth desuperheater 22 and a peaking low side valve 23. The startup low pressure bypass 18 is provided with a third desuperheater 19 and the startup low side connection line 26 is provided with a startup low side valve 20. A low-pressure cylinder steam inlet adjusting valve 9 is arranged between the low-pressure cylinder steam input pipeline 8 and the steam inlet of the low-pressure cylinder 3. The heating connection pipe 10 is provided with a heating connection valve 11.
When the deep peak shaving is carried out, the air inflow of the steam turbine is reduced by opening the peak shaving high-pressure bypass 15, and after the peak shaving low-pressure bypass 21 is opened, steam is introduced into the heating pipeline 25 for heat supply, so that the load of the generated steam is transferred to the heat supply. In the peak shaving process, the low-pressure bypass 18 is started to supply industrial extraction steam, and the characteristics of load reduction without heat extraction and stable combined supply of extraction steam and heat supply under the low load of the steam turbine are realized.
Referring to fig. 1, a cogeneration method comprises the following steps:
a. the starting high-pressure bypass 12 is only used during starting, a peak-shaving high-pressure bypass 15 is newly added between two high-pressure cylinder steam input pipelines 4 and two high-pressure cylinder steam output pipelines 5, an intermediate-pressure cylinder steam output pipeline 7 is connected with a heating connecting pipeline 10, a peak-shaving low-pressure bypass 21 is newly added between two intermediate-pressure cylinder steam input pipelines 6 and the heating connecting pipeline 10, the heating connecting pipeline 10 is connected with a heating pipeline 25, the two intermediate-pressure cylinder steam input pipelines 6 are connected with a starting low-pressure bypass 18 through a starting low-pressure bypass connecting pipeline 26, and the starting low-pressure bypass 18 is connected with an industrial steam extraction pipeline 24;
b. starting a drain valve from the starting low-pressure bypass 18 to the industrial extraction pipeline, draining condensed water in the pipeline, slowly starting the starting low-pressure bypass 18 to the industrial extraction pipeline valve, ensuring that the steam temperature from the starting low-pressure bypass 18 to the industrial extraction pipeline is less than 300 ℃ through a desuperheater until the industrial extraction flow is more than 40 tons/hour and the extraction pressure is more than 0.7MPa, and meeting the industrial production requirements of users;
c. starting the low-pressure bypass 18 until the opening of the valve of the industrial extraction pipeline reaches 70 percent and still does not meet the user requirement, or starting the drain valve of the pipeline of the peak-adjusting high-pressure bypass 15 when the ratio of the pressure ratio of the adjusting-level pressure P1 of the high-pressure cylinder 1 to the second-stage extraction pressure P2 of the intermediate pressure cylinder 2 is less than 5, draining the condensate water of the pipeline, slowly opening the pipeline valve of the peak-adjusting high-pressure bypass 15, ensuring the temperature of the steam of the pipeline of the peak-adjusting high-pressure bypass 15 to be between 330 ℃ and 350 ℃ through a desuperheater until the industrial extraction flow is more than 70 tons/hour and the extraction pressure is more than 0.7MPa, and meeting the user industrial production requirement;
d. opening a drain valve from the peak-shaving low-pressure bypass 21 to a heating pipeline 25, emptying condensed water in the pipeline, slowly opening a valve from the peak-shaving low-pressure bypass 21 to the heating pipeline 25, ensuring that the steam temperature from the peak-shaving low-pressure bypass 21 to the heating pipeline 25 is less than 200 ℃ through a desuperheater, simultaneously monitoring the change of the pressure ratio, when the pressure ratio is lower than 5.2, opening a pipeline valve from the peak-shaving high-pressure bypass 15, increasing the pressure ratio to be more than 5.7, then opening the valve opening from the peak-shaving low-pressure bypass 21 to the heating pipeline 25, when the pressure ratio is lower than 5.2 again, then opening a pipeline valve from the peak-shaving high-pressure bypass 15, performing reciprocating operation in such a way, and maintaining the pressure ratio between 5 and 6 so as to ensure that the pressure at the position of the steam turbine set is matched, the axial thrust balance of the high and medium pressure cylinders 2 of the steam turbine set is ensured, and the operation safety of the turbine set is ensured until the heat in the heating pipeline 25 is more than 400GJ/h, the heating requirement of a user is met;
e. when the opening degrees of the pipeline valve of the peak-shaving high-pressure bypass 15, the valve opening degrees of the peak-shaving low-pressure bypass 21 to the heating pipeline 25 reach more than 90 percent and still cannot meet the requirement of a heat supply network user, the steam inlet adjusting valve 27 of the intermediate pressure cylinder of the steam input pipeline 6 of the intermediate pressure cylinder is slowly turned down, the pressure ratio is monitored at the same time, the pressure ratio is kept between 5 and 6 until the opening degree of the steam inlet adjusting valve 27 of the intermediate pressure cylinder is reduced to 30 percent, if the opening degree of the steam inlet adjusting valve 27 of the intermediate pressure cylinder cannot meet the requirement of the heating user, the steam inlet adjusting valve 9 of the low pressure cylinder is slowly turned down until the opening degree of the steam inlet adjusting valve 9 of the low pressure cylinder is reduced to 20 percent, and the air inlet pressure of the low pressure cylinder 3 is ensured to be more than 0.01 MPa, so that the heating heat quantity reaches 600GJ/h under the condition that the electric load reaches 25 percent of the rated installed capacity.
During the peak period of heat supply, the regulating valve in the combined unit supplies heat with large load, and the ratio of the pressure P1 of the regulating stage of the high-pressure cylinder 1 to the pressure P2 of the second-stage steam extraction of the intermediate-pressure cylinder 2 is introduced in the regulating process as a regulating reference so as to ensure the axial thrust balance of the high-pressure cylinder 2 and the intermediate-pressure cylinder 2 of the steam turbine unit and ensure the operation safety of the unit.
It should be finally noted that the above only serves to illustrate the technical solution of the present invention, and not to limit the scope of the present invention, and that simple modifications or equivalent replacements performed by those skilled in the art to the technical solution of the present invention do not depart from the spirit and scope of the technical solution of the present invention.
Claims (7)
1. A combined heat and power generation system comprises a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder, wherein an upper steam inlet and a lower steam inlet of the high-pressure cylinder are connected with an upper high-pressure cylinder steam input pipeline and a lower high-pressure cylinder steam input pipeline, two steam outlets of the high-pressure cylinder steam input pipeline and the two high-pressure cylinder steam output pipelines are connected with a starting high-pressure bypass, the high-pressure cylinder steam output pipeline is connected with a steam inlet of a boiler reheater, an upper steam inlet and a lower steam inlet of the intermediate-pressure cylinder are connected with an upper intermediate-pressure cylinder steam input pipeline and a lower intermediate-pressure cylinder steam input pipeline, a steam outlet of the boiler reheater is connected with the intermediate-pressure cylinder steam input pipeline, a steam outlet of the intermediate-pressure cylinder is connected with an intermediate-pressure cylinder steam output pipeline, a steam inlet of the low-pressure cylinder is connected with a low-pressure cylinder steam input pipeline, and the intermediate-pressure cylinder steam output pipeline is connected with the low-pressure cylinder steam input pipeline, the method is characterized in that: two high pressure cylinder steam input pipeline and two be connected with the peak shaver high pressure bypass between the high pressure cylinder steam output pipeline, heating connecting line is connected to the intermediate pressure cylinder steam output pipeline, two the intermediate pressure cylinder steam input pipeline with be connected with the peak shaver low pressure bypass between the heating connecting line, heating connecting line and heating pipe connection, two the intermediate pressure cylinder steam input pipeline is connected with a start low pressure bypass through starting low side connecting line, start low pressure bypass and industry extraction pipeline connection.
2. A cogeneration system according to claim 1, wherein: the starting high-pressure bypass is provided with a first desuperheater and a starting high-pressure bypass valve.
3. A cogeneration system according to claim 2, wherein: the peak-shaving high-pressure bypass is provided with a second desuperheater and a peak-shaving high-pressure bypass valve.
4. A cogeneration system according to claim 3, wherein: the peak-regulating low-pressure bypass is provided with a fourth desuperheater and a peak-regulating low-bypass valve.
5. A cogeneration system according to claim 4, wherein: the starting low-pressure bypass is provided with a third desuperheater, and the starting low-bypass connecting pipeline is provided with a starting low-bypass valve.
6. A cogeneration system according to claim 5, wherein: and a low-pressure cylinder steam inlet adjusting valve is arranged between the low-pressure cylinder steam input pipeline and the steam inlet of the low-pressure cylinder.
7. A cogeneration system according to claim 6, wherein: the heating connecting pipeline is provided with a heating connecting valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121057259.1U CN215170223U (en) | 2021-05-18 | 2021-05-18 | Cogeneration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121057259.1U CN215170223U (en) | 2021-05-18 | 2021-05-18 | Cogeneration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215170223U true CN215170223U (en) | 2021-12-14 |
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ID=79370765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121057259.1U Expired - Fee Related CN215170223U (en) | 2021-05-18 | 2021-05-18 | Cogeneration system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215170223U (en) |
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2021
- 2021-05-18 CN CN202121057259.1U patent/CN215170223U/en not_active Expired - Fee Related
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| 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: 20211214 |