CN214891511U - Flow regulating device of heat supply unit - Google Patents
Flow regulating device of heat supply unit Download PDFInfo
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- CN214891511U CN214891511U CN202121566931.XU CN202121566931U CN214891511U CN 214891511 U CN214891511 U CN 214891511U CN 202121566931 U CN202121566931 U CN 202121566931U CN 214891511 U CN214891511 U CN 214891511U
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Abstract
The application discloses heat supply unit flow control device includes: the device comprises a low-pressure cylinder, an intermediate-pressure cylinder, a main communicating pipe, a bypass communicating pipe, a main regulating valve, a bypass regulating valve and a Roots vacuum pump, wherein an outlet of the intermediate-pressure cylinder is divided into two paths, one path is communicated with an inlet of the main communicating pipe, the other path is communicated with an inlet of the bypass communicating pipe, an outlet of the main communicating pipe is communicated with an inlet of a steam inlet pipe of the low-pressure cylinder, an outlet of the bypass communicating pipe is communicated with an inlet of the steam inlet pipe of the low-pressure cylinder, an outlet of the steam inlet pipe of the low-pressure cylinder is communicated with an inlet of the low-pressure cylinder, and the pipe diameter of the bypass communicating pipe is larger than a preset value; the main communicating pipe and the bypass communicating pipe are respectively provided with the main regulating valve and the bypass regulating valve to regulate the flow of the steam entering the low pressure cylinder; and the outlet of the low pressure cylinder is provided with the roots vacuum pump to pump air in the low pressure cylinder.
Description
Technical Field
The application relates to the technical field of heat supply units, in particular to a flow regulating device of a heat supply unit.
Background
With the rapid development of renewable energy, China adheres to the development direction of clean, low-carbon, safe and efficient energy sources, and develops clean energy sources such as wind energy and solar energy vigorously. However, wind energy and solar energy power generation has the characteristics of randomness, intermittence and quick change, the peak regulation difficulty of a power grid is increased along with the increase of the specific gravity of new energy power generation and the excess of the traditional coal electricity capacity, and the wind and light abandonment in some areas is serious, so that new requirements are provided for improving the operation flexibility and the deep peak regulation capability of an active thermal power generating unit.
In order to meet new requirements, a common scheme is a low-pressure cylinder zero-output operation scheme, and usually only a small amount of cooling steam is reserved to enter a low-pressure cylinder, so that the low-pressure rotor zero-output operation is realized, more steam enters a heating system to improve the heating capacity, and the electric load is reduced. However, when the existing heat supply unit is used for low-pressure cylinder zero-output transformation, the pipe diameter of the bypass is small, continuous adjustment of the steam inlet quantity of the low-pressure cylinder cannot be achieved, and the steam exhaust back pressure of the low-pressure cylinder is high, so that the low-pressure cylinder cannot be continuously adjusted without disturbance.
SUMMERY OF THE UTILITY MODEL
The application discloses heat supply unit flow adjusting device to solve the problem that the higher and less pipe diameter of bypass communicating pipe of backpressure that present low pressure jar leads to unable steam flow continuous adjustment to getting into the low pressure jar.
In order to solve the above problems, the following technical solutions are adopted in the present application:
the embodiment of the application discloses heat supply unit flow control device includes: the device comprises a low-pressure cylinder, an intermediate-pressure cylinder, a main communicating pipe, a bypass communicating pipe, a main regulating valve, a bypass regulating valve and a Roots vacuum pump, wherein an outlet of the intermediate-pressure cylinder is divided into two paths, one path is communicated with an inlet of the main communicating pipe, the other path is communicated with an inlet of the bypass communicating pipe, an outlet of the main communicating pipe is communicated with an inlet of a steam inlet pipe of the low-pressure cylinder, an outlet of the bypass communicating pipe is communicated with an inlet of the steam inlet pipe of the low-pressure cylinder, an outlet of the steam inlet pipe of the low-pressure cylinder is communicated with an inlet of the low-pressure cylinder, and the pipe diameter of the bypass communicating pipe is larger than a preset value; the main communicating pipe and the bypass communicating pipe are respectively provided with the main regulating valve and the bypass regulating valve to regulate the flow of the steam entering the low pressure cylinder; and the outlet of the low pressure cylinder is provided with the roots vacuum pump to pump air in the low pressure cylinder.
The technical scheme adopted by the application can achieve the following beneficial effects:
the embodiment of the application discloses a flow regulating device of a heat supply unit, which can extract air in a low pressure cylinder by adding a Roots vacuum pump, so that the low pressure cylinder can operate under a vacuum condition, thereby reducing the back pressure of the low pressure cylinder, gradually reducing the steam flow entering the low pressure cylinder, continuously regulating the steam inlet flow of the low pressure cylinder under the condition of sufficiently low back pressure, switching the low pressure cylinder to zero output force in the heat supply process, closing a main regulating valve at the moment, using the steam of an intermediate pressure cylinder for heat supply, introducing a small amount of cooling steam through a bypass communicating pipe with a large pipe diameter, regulating the steam flow through a bypass regulating valve, continuously regulating the steam flow entering the bypass communicating pipe, and smoothly and continuously entering the low pressure cylinder through a steam inlet pipe of the low pressure cylinder, therefore, the zero-output operation of the low-pressure cylinder can be realized, and the peak regulation capacity and the heat supply capacity of the heat supply unit can be improved. Therefore, through this kind of mode, the heat supply unit flow adjusting device that this application embodiment disclosed can solve the higher and less pipe diameter that leads to of the communicating pipe of bypass of backpressure of present low pressure jar and can't lead to the steam flow continuous adjustment's that gets into the low pressure jar problem.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a flow regulating device of a heating unit disclosed in an embodiment of the present application.
Description of reference numerals:
101-low pressure cylinder, 102-intermediate pressure cylinder, 103-main communicating pipe, 104-bypass communicating pipe, 105-main regulating valve, 106-bypass regulating valve, 107-roots vacuum pump, 108-low pressure cylinder steam inlet pipe, 109-flow detection mechanism, 110-water spray mechanism, 1101-first water spray pipeline, 1102-second water spray pipeline, 1103-first water spray regulating valve, 1104-second water spray regulating valve, 111-blade monitoring mechanism, 112-heat network steam supply pipeline, 113-heat network heater, 114-heat network heater steam inlet pipeline, 115-heat network steam supply regulating valve and 116-high pressure cylinder.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Technical solutions disclosed in the embodiments of the present application are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present application discloses a heat supply unit flow adjusting device, where the disclosed heat supply unit flow adjusting device includes: a low pressure cylinder 101, an intermediate pressure cylinder 102, a main communication pipe 103, a bypass communication pipe 104, a main regulator valve 105, a bypass regulator valve 106, and a roots vacuum pump 107, wherein,
the outlet of the intermediate pressure cylinder 102 is divided into two paths, one path is communicated with the inlet of the main communicating pipe 103, the other path is communicated with the inlet of the bypass communicating pipe 104, the outlet of the main communicating pipe 103 is communicated with the inlet of the low pressure cylinder steam inlet pipe 108, the outlet of the bypass communicating pipe 104 is communicated with the inlet of the low pressure cylinder steam inlet pipe 108, the outlet of the low pressure cylinder steam inlet pipe 108 is communicated with the inlet of the low pressure cylinder 101, and the pipe diameter of the bypass communicating pipe 104 is larger than the preset value. Main connection pipe 103 and bypass connection pipe 104 are provided with a main control valve 105 and a bypass control valve 106, respectively, for controlling the flow rate of steam entering low pressure cylinder 101.
By increasing the pipe diameter of the bypass communicating pipe 104, the pipe diameter of the bypass communicating pipe 104 is larger than a preset value, so that steam with a larger flow rate can be introduced into the low pressure cylinder 101, during heat supply, under normal conditions, steam introduced into the intermediate pressure cylinder 102 can be used for heat supply, meanwhile, a small amount of cooling steam can be introduced through the bypass communicating pipe 104, so that blast heat generated by rotation of a low pressure rotor in the low pressure cylinder 101 can be taken away, the low pressure cylinder 101 runs in an idle running mode under a vacuum condition, zero output of the low pressure cylinder 101 is realized, when the low pressure cylinder 101 is switched, the main regulating valve 105 is closed, so that the steam flow can be regulated by rotating the bypass regulating valve 106, and the steam flow entering the low pressure cylinder 101 can be continuously regulated. The manner of opening or closing the main regulating valve 105 and the bypass regulating valve 106 may be manual operation or program control, and the embodiment of the present application is not particularly limited thereto.
By increasing the pipe diameter of the bypass communication pipe 104, the pipe diameter of the bypass communication pipe 104 is larger than a preset value, so that the bypass communication pipe 104 can accommodate more flows of steam. For example, the pipe diameter of the bypass communicating pipe 104 may be increased to increase the steam flow entering the bypass communicating pipe 104 from 20T/H to 250T/H, so that after the main adjusting valve 105 is closed, the steam flow may be adjusted by rotating the bypass adjusting valve 106, so that the steam flow gradually and continuously enters the low pressure cylinder steam inlet pipe 108 from 250T/H and enters the low pressure cylinder 101 without disturbance, thereby avoiding the situation that the steam flow is directly and rapidly closed from 170T/H to 20T/H, which may cause the intermediate flow not to be continuously adjusted.
A roots vacuum pump 107 is provided at an outlet of the low pressure cylinder 101 to pump air in the low pressure cylinder 101, so that the low pressure cylinder 101 can be in a vacuum state, and thus the exhaust pressure, i.e., back pressure, of the low pressure cylinder 101 can be reduced. It should be noted that only if the back pressure of the low pressure cylinder 101 is ensured to be low enough, the steam flow entering the low pressure cylinder 101 can be continuously adjusted, for example, when the back pressure of the low pressure cylinder 101 is lower than 4.9KPa, the steam inlet flow of the low pressure cylinder is 170T/H, the steam flow can be gradually reduced along with the reduction of the back pressure, and when the back pressure is reduced to 1KPa, the steam flow can be reduced to 120T/H, so that the steam flow entering the low pressure cylinder 101 can stay at any position, thereby continuously adjusting the steam flow entering the low pressure cylinder 101, and enabling the low pressure cylinder 101 to operate under a vacuum condition.
The embodiment of the application discloses a flow regulating device of a heat supply unit, which can extract air in a low pressure cylinder by adding a Roots vacuum pump, so that the low pressure cylinder can operate under a vacuum condition, thereby reducing the back pressure of the low pressure cylinder, gradually reducing the steam flow entering the low pressure cylinder, continuously regulating the steam inlet flow of the low pressure cylinder under the condition of sufficiently low back pressure, switching the low pressure cylinder to zero output force in the heat supply process, closing a main regulating valve at the moment, using the steam of an intermediate pressure cylinder for heat supply, introducing a small amount of cooling steam through a bypass communicating pipe with a large pipe diameter, regulating the steam flow through a bypass regulating valve, continuously regulating the steam flow entering the bypass communicating pipe, and smoothly and continuously entering the low pressure cylinder through a steam inlet pipe of the low pressure cylinder, therefore, the zero-output operation of the low-pressure cylinder can be realized, and the peak regulation capacity and the heat supply capacity of the heat supply unit can be improved. Therefore, through this kind of mode, the heat supply unit flow adjusting device that this application embodiment disclosed can solve the higher and less pipe diameter that leads to of the communicating pipe of bypass of backpressure of present low pressure jar and can't lead to the steam flow continuous adjustment's that gets into the low pressure jar problem.
In a further technical solution, the heat supply unit flow adjusting device disclosed in the embodiment of the present application may include: the flow detection mechanism 109 and the flow detection mechanism 109 can be disposed at the steam inlet pipe 108 of the low pressure cylinder and close to the low pressure cylinder 101, and the flow detection mechanism 109 can detect whether the steam flow entering the low pressure cylinder 101 reaches the flow value required by the user according to the requirement under the full operation condition.
In one implementation, different measurement points are arranged on the low-pressure cylinder steam inlet pipe 108, a low-pressure cylinder steam inlet pressure measurement point, a low-pressure cylinder steam inlet temperature measurement point and a unit pressure extraction measurement point are adopted, and the calculation is carried out through a Friedel's formulaTo the steam flow entering low pressure cylinder 101. Specifically, can measure low pressure cylinder steam inlet flow, low pressure cylinder steam inlet pressure, 5 sections extraction pressure and low pressure cylinder steam inlet temperature through different sensors, certainly, also can measure through other devices, this application embodiment does not do specific restriction to this, after obtaining data, can pass through the stay guerre formula:
the flow of steam into the low pressure cylinder 101 is obtained, wherein GLPinFor low cylinder inlet flow, PLPinIs the inlet pressure of the low-pressure cylinder, P#5Is 5-stage pumping pressure, TLPinThe steam inlet temperature of the low-pressure cylinder is a constant, and a and b are constants, so that the steam flow entering the low-pressure cylinder 101 can be calculated, the steam flow entering the low-pressure cylinder 101 can be detected, the low-pressure cylinder 101 can be ensured to be filled with steam with normal flow, and the low-pressure cylinder can work safely.
In an embodiment of the present application, a heat supply unit flow adjusting device disclosed in the present application may further include: it should be noted that, as the steam inflow rate of the low pressure cylinder 101 decreases, the steam exhaust volume of the low pressure cylinder 101 decreases, so that the last stage blade in the low pressure cylinder 101 generates a blowing phenomenon, which causes an excessively high steam exhaust temperature, and in order to solve this technical problem, the water spray mechanism 110 may be added, so as to cool the low pressure cylinder 101.
In addition, when the steam inlet flow of the low pressure cylinder 101 is small, the working conditions of the two sides of the low pressure cylinder 101 are different, so that the generated heat is different, if the water injection is controlled by only one adjusting valve, the temperature of the high temperature side of the low pressure cylinder 101 is reduced, and meanwhile, the temperature of the low temperature side of the low pressure cylinder 101 is lower, and further, the temperature is lower than the saturation temperature, so that the vanes in the low pressure cylinder 101 are corroded. In order to solve this technical problem, in an alternative solution, the water spraying mechanism 110 may include: the hydraulic cylinder is provided with a first water spray pipe 1101 and a second water spray pipe 1102, wherein the first water spray pipe 1101 is communicated with one side of the low pressure cylinder 101, the second water spray pipe 1102 is communicated with the other side of the low pressure cylinder 101, and the first water spray pipe 1101 and the second water spray pipe 1102 are arranged oppositely. The water spray mechanism 110 may further include: the first and second sprinkler adjusting valves 1103 and 1104 are respectively disposed on the first and second water spraying pipes 1101 and 1102 to adjust the amount of water sprayed into the low pressure cylinder 101.
In this way, the first spray regulating valve 1103 and the second spray regulating valve 1104 can respectively regulate the first spray pipe 1101 and the second spray pipe 1102 to control the amount of water sprayed into both sides of the low pressure cylinder 101, so that the blade corrosion caused by excessive spraying of water from one side can be prevented while the low pressure cylinder 101 is cooled.
In an implementation manner, the heat supply unit flow adjusting device disclosed in the embodiment of the present application may further include: blade monitoring means 111, which is provided inside low pressure cylinder 101, monitors the amplitude and/or frequency of the blade in low pressure cylinder 101, and thereby can monitor the operating state of the blade in low pressure cylinder 101 in real time. Specifically, different probes may be provided near the vane of the low pressure cylinder 101, so that different parameters such as the amplitude and/or frequency of the vane may be monitored to determine the operating state of the vane. In this way, the operating state of low pressure cylinder 101 can be monitored, ensuring that low pressure cylinder 101 can operate properly.
In the heat supply unit flow rate adjusting device disclosed in the embodiment of the present application, the outlet of the main communicating pipe 103 may be communicated with the inlet of the heat supply network steam supply pipeline 112, and the heat supply network steam supply pipeline 112 is communicated with the heat supply network heater 113. In the heating process, the steam introduced into the intermediate pressure cylinder 102 is introduced into the heating network heater 113, so that the purpose of heating can be achieved.
In addition, a heat supply network heater steam inlet pipeline 114 can be arranged between the heat supply network steam supply pipeline 112 and the heat supply network heater 113, the inlet of the heat supply network heater steam inlet pipeline 114 is communicated with the outlet of the heat supply network steam supply pipeline 112, and the outlet of the heat supply network heater steam inlet pipeline 114 is communicated with the heat supply network heater 113. So that the steam led out from the intermediate pressure cylinder 102 can be passed through the heat supply network steam supply pipe 112 and the heat supply network heater steam inlet pipe 114 in turn to the heat supply network heater 113 to realize heat supply.
In a further technical scheme, a heat supply network steam supply adjusting valve 115 may be disposed on the heat supply network steam supply pipeline 112 to adjust the flow rate of steam entering the heat supply network heater 113, so that the flow rate of steam entering the heat supply network heater 113 may be continuously adjusted by adjusting the heat supply network steam supply adjusting valve 115.
In this application embodiment, the heating unit flow adjusting device disclosed in this application embodiment may further include: and the high-pressure cylinder 116, the high-pressure cylinder 116 and the intermediate-pressure cylinder 102 are connected together, and the low-pressure cylinder 101, the intermediate-pressure cylinder 102 and the high-pressure cylinder 116 are coaxially distributed.
In addition, the heating unit flow control device that this application embodiment disclosed can also include: and the condenser is communicated with the outlet of the low-pressure cylinder 101 and receives the steam discharged by the low-pressure cylinder 101. After the low pressure cylinder 101 does work on the steam, the residual steam is discharged to the condenser, so that the discharged steam of the low pressure cylinder 101 can be condensed into water for reuse of a heat supply unit, resources can be saved, and the purpose of recycling the resources is achieved.
In the embodiments of the present application, the difference between the embodiments is described in detail, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in view of brevity of the text.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A heating unit flow regulating device, characterized by includes: a low pressure cylinder (101), an intermediate pressure cylinder (102), a main communicating pipe (103), a bypass communicating pipe (104), a main regulating valve (105), a bypass regulating valve (106) and a roots vacuum pump (107), wherein,
the outlet of the intermediate pressure cylinder (102) is divided into two paths, one path is communicated with the inlet of the main communicating pipe (103), the other path is communicated with the inlet of the bypass communicating pipe (104), the outlet of the main communicating pipe (103) is communicated with the inlet of a low pressure cylinder steam inlet pipe (108), the outlet of the bypass communicating pipe (104) is communicated with the inlet of the low pressure cylinder steam inlet pipe (108), the outlet of the low pressure cylinder steam inlet pipe (108) is communicated with the inlet of the low pressure cylinder (101), and the pipe diameter of the bypass communicating pipe (104) is larger than a preset value;
the main communicating pipe (103) and the bypass communicating pipe (104) are respectively provided with the main regulating valve (105) and the bypass regulating valve (106) to regulate the flow of steam entering the low pressure cylinder (101);
and the roots vacuum pump (107) is arranged at the outlet of the low-pressure cylinder (101) and used for pumping air in the low-pressure cylinder (101).
2. Heating unit flow regulating device according to claim 1, characterized in that it comprises: and the flow detection mechanism (109) is arranged at the position of the low-pressure cylinder steam inlet pipe (108) close to the low-pressure cylinder (101).
3. The heating unit flow regulating device according to claim 1, further comprising: a water spray mechanism (110), the water spray mechanism (110) comprising: the hydraulic cylinder hydraulic system comprises a first water spray pipeline (1101) and a second water spray pipeline (1102), wherein the first water spray pipeline (1101) is communicated with one side of the low-pressure cylinder (101), the second water spray pipeline (1102) is communicated with the other side of the low-pressure cylinder (101), and the first water spray pipeline (1101) and the second water spray pipeline (1102) are arranged oppositely.
4. Heating unit flow regulating device according to claim 3, characterized in that said water spraying means (110) further comprise: the water spraying device comprises a first water spray adjusting valve (1103) and a second water spray adjusting valve (1104), wherein the first water spray adjusting valve (1103) and the second water spray adjusting valve (1104) are respectively arranged on a first water spraying pipeline (1101) and a second water spraying pipeline (1102) and are used for adjusting the amount of water sprayed into the low-pressure cylinder (101).
5. The heating unit flow regulating device according to claim 1, further comprising: and a blade monitoring means (111), wherein the blade monitoring means (111) is provided inside the low pressure cylinder (101) and monitors the amplitude and/or frequency of the blade.
6. The heating unit flow regulating device according to claim 1, wherein the outlet of the main communicating pipe (103) is communicated with the inlet of a heat supply network steam supply pipeline (112), and the heat supply network steam supply pipeline (112) is communicated with a heat supply network heater (113).
7. The heating unit flow regulating device according to claim 6, wherein a heating network heater steam inlet pipeline (114) is arranged between the heating network steam supply pipeline (112) and the heating network heater (113), an inlet of the heating network heater steam inlet pipeline (114) is communicated with an outlet of the heating network steam supply pipeline (112), and an outlet of the heating network heater steam inlet pipeline (114) is communicated with the heating network heater (113).
8. The heating unit flow regulating device according to claim 7, wherein a heating network steam supply regulating valve (115) is provided in the heating network steam supply pipeline (112) to regulate the flow of steam entering the heating network heater (113).
9. The heating unit flow regulating device according to claim 1, further comprising: the high-pressure cylinder (116) is connected with the intermediate-pressure cylinder (102), and the low-pressure cylinder (101), the intermediate-pressure cylinder (102) and the high-pressure cylinder (116) are distributed coaxially.
10. The heating unit flow regulating device according to claim 1, further comprising: and the condenser is communicated with an outlet of the low pressure cylinder (101) and receives the steam discharged by the low pressure cylinder (101).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121566931.XU CN214891511U (en) | 2021-07-09 | 2021-07-09 | Flow regulating device of heat supply unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121566931.XU CN214891511U (en) | 2021-07-09 | 2021-07-09 | Flow regulating device of heat supply unit |
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| CN214891511U true CN214891511U (en) | 2021-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121566931.XU Active CN214891511U (en) | 2021-07-09 | 2021-07-09 | Flow regulating device of heat supply unit |
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| CN (1) | CN214891511U (en) |
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2021
- 2021-07-09 CN CN202121566931.XU patent/CN214891511U/en active Active
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