CN210567534U - Pressure regulating system based on steam excess pressure electricity generation - Google Patents
Pressure regulating system based on steam excess pressure electricity generation Download PDFInfo
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- CN210567534U CN210567534U CN201920348380.6U CN201920348380U CN210567534U CN 210567534 U CN210567534 U CN 210567534U CN 201920348380 U CN201920348380 U CN 201920348380U CN 210567534 U CN210567534 U CN 210567534U
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Abstract
The utility model relates to a pressure governing system based on steam excess pressure electricity generation can not satisfy the defect of different industrial user's different pressure demands for solving conventional excess pressure power generation system. The utility model comprises a turbine expander, a generator, a control system and a turbine speed adjusting grid-connected cabinet; the method comprises the following steps that a high-pressure steam input interface, a steam-water separator, a flow meter and an expander inlet regulating valve are sequentially arranged on a steam inlet pipeline of a turbo expander, and an expander outlet regulating valve, a check valve and a low-pressure steam output interface are sequentially arranged on a steam outlet pipeline of the turbo expander; the turbine expander is coaxially connected with the generator, and the generator is connected with the turbine rotating speed adjusting grid-connected cabinet. The whole system is monitored and controlled by a control system, a back pressure adjusting method is adopted to meet the pressure requirements of different industrial users, and the residual pressure is used for generating electricity through a turbine; by monitoring and calculating each key parameter, the safe and stable operation of the turboexpander under the working condition of meeting different pressure requirements is ensured.
Description
Technical Field
The utility model relates to a pressure governing system based on electricity generation of steam residual pressure is applicable to industrial user's different pressure demands.
Background
Steam is used in large quantities as the primary energy transfer medium. However, due to factors such as poor design of a steam system, change of parameters of a user side and the like, a large number of problems such as mismatching of steam pressure grades, mismatching of steam yield and consumption, low steam quality and the like exist in both parties, so that a large amount of steam is used in a pressure reduction mode or directly emptied in the production and life processes, and waste is huge.
The residual pressure power generation system can efficiently recover a large amount of energy lost during pressure regulation, and convert the energy into mechanical energy, so as to be used for power generation, for example, the chinese patent with the application number of 201010162555.8. Conventional residual pressure power generation systems tend to be unable to respond to the different pressure demands of different industrial users.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that the conventional excess pressure power generation system can not meet different pressure requirements of different industrial users, and provides a pressure regulation system based on steam excess pressure power generation, which has reasonable design, adopts a back pressure regulation mode to meet the pressure requirements of different industrial users, and simultaneously uses the excess pressure to generate power through a turbine; and each key parameter is monitored and analyzed, so that the safe and stable operation of the turboexpander under the working condition of meeting different pressure requirements is ensured.
The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides a pressure governing system based on electricity generation of steam excess pressure which characterized in that: the system comprises a turboexpander, a generator, a control system and a turbine rotating speed adjusting grid-connected cabinet; the system comprises a steam inlet pipeline of a turbo expander, a high-pressure steam input interface, a steam-water separator, a flow meter, an expander inlet regulating valve, an expander inlet temperature measuring point and an expander inlet pressure measuring point, wherein the steam inlet pipeline of the turbo expander is sequentially provided with the high-pressure steam input interface, the steam-water separator, the flow meter, the expander inlet regulating valve, the expander inlet temperature measuring point and the expander inlet pressure measuring point along the steam flowing direction; the turbine expander is coaxially connected with the generator, and the generator is connected with the turbine rotating speed adjusting grid-connected cabinet; the flow meter, the expander inlet regulating valve, the expander inlet temperature measuring point, the expander inlet pressure measuring point, the generator, the expander outlet temperature measuring point, the expander outlet pressure measuring point, the expander outlet regulating valve and the turbine rotating speed regulating grid-connected cabinet are all connected with the control system.
The pressure regulation method comprises the following steps:
the steam flows through a high-pressure steam input interface, a steam-water separator, a flow meter, an expander inlet regulating valve, a turbine expander, an expander outlet regulating valve and a check valve in sequence, and is finally discharged through a low-pressure steam output interface; the connection is pipeline connection, and an air inlet and outlet pipeline is formed.
Firstly, a steam-water separator is used for ensuring that no water drops enter the system, so that the water drops are prevented from damaging blades of the turboexpander; monitoring whether the pressure exceeds a critical value or not through an expander inlet pressure measuring point, and adjusting the pressure by matching with an expander inlet adjusting valve, so as to prevent overhigh water vapor pressure from entering a turbine expander; monitoring the outlet pressure of the turbo expander through an expander outlet pressure measuring point, and adjusting the pressure to reach the pressure required by a user by matching with an expander outlet adjusting valve; the backflow of high-pressure steam outside the system is prevented through a check valve; because different pressure differences can cause different rotating speeds of the turboexpander, the high-frequency alternating current output by the generator is reduced to the frequency meeting the requirements of users by tracking the rotating speed of the turbine and adjusting the internal transformation ratio of the grid-connected cabinet.
Furthermore, the outlet pressure of different turbine expanders is adjusted through the expander outlet adjusting valve so as to meet the requirements of different industrial users; meanwhile, a control system monitors an expander inlet temperature measuring point, an expander inlet pressure measuring point and the preset highest rotating speed of the steam flow turbine, calculates the lowest pressure of the outlet of the turboexpander, and prevents the overhigh rotating speed of the turboexpander and the damage to equipment due to the fact that the outlet regulating valve of the expander is set to be over-low pressure.
Compared with the prior art, the utility model, have following advantage and effect:
1) the method aims at realizing the rapid adjustment of the supply pressure of the residual pressure power generation system for industrial users with different pressure requirements.
2) The full-automatic grid connection is realized for the residual pressure power generation systems under different working conditions.
3) By monitoring key parameters and automatically controlling, the system is protected from running stably and safely. The pressure regulation device can prevent the turbine rotating speed from exceeding a safety value when pressure is regulated due to the fact that pressure requirements of different industrial users are met.
Drawings
Fig. 1 is a schematic structural diagram in an embodiment of the present invention.
In the figure: the system comprises a high-pressure steam input interface 1, a steam-water separator 2, a flow meter 3, an expander inlet regulating valve 4, an expander inlet temperature measuring point 5, an expander inlet pressure measuring point 6, a turbine expander 7, a generator 8, an expander outlet temperature measuring point 9, an expander outlet pressure measuring point 10, an expander outlet regulating valve 11, a check valve 12, a low-pressure steam output interface 13, a control system 14 and a turbine rotating speed regulating grid-connected cabinet 15.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1, the pressure regulation system based on steam residual pressure power generation in the present embodiment includes a turboexpander 7, a generator 8, a control system 14, and a turbine speed regulation grid-connected cabinet 15.
A high-pressure steam input interface 1, a steam-water separator 2, a flow meter 3, an expander inlet regulating valve 4, an expander inlet temperature measuring point 5 and an expander inlet pressure measuring point 6 are sequentially arranged on a steam inlet pipeline of the turboexpander 7 along the steam flowing direction, and an expander outlet temperature measuring point 9, an expander outlet pressure measuring point 10, an expander outlet regulating valve 11, a check valve 12 and a low-pressure steam output interface 13 are sequentially arranged on a steam outlet pipeline of the turboexpander 7 along the steam flowing direction; the turbine expansion machine 7 is coaxially connected with a generator 8, and the generator 8 is connected with a turbine rotating speed adjusting grid-connected cabinet 15; the flow meter 3, the expander inlet regulating valve 4, the expander inlet temperature measuring point 5, the expander inlet pressure measuring point 6, the generator 8, the expander outlet temperature measuring point 9, the expander outlet pressure measuring point 10, the expander outlet regulating valve 11 and the turbine rotating speed regulating grid-connected cabinet 15 are connected with the control system 14.
The pressure regulating method of the pressure regulating system based on the steam residual pressure power generation comprises the following steps:
steam flows through a high-pressure steam input interface 1, a steam-water separator 2, a flowmeter 3, an expander inlet regulating valve 4, a turbine expander 7, an expander outlet regulating valve 11 and a check valve 12 in sequence, and is finally discharged through a low-pressure steam output interface 13; the connection is pipeline connection, and an air inlet and outlet pipeline is formed.
Firstly, the steam-water separator 2 ensures that no water drops enter the system, and further prevents the water drops from damaging the blades of the turboexpander 7; monitoring whether the pressure exceeds a critical value or not through an expander inlet pressure measuring point 6, and adjusting the pressure by matching with an expander inlet adjusting valve 4, so as to prevent overhigh steam pressure from entering a turbine expander 7; monitoring the outlet pressure of the turbo expander 7 through an expander outlet pressure measuring point 10, and adjusting the pressure to reach the pressure required by a user by matching with an expander outlet adjusting valve 11; the backflow of high-pressure steam outside the system is prevented through the check valve 12; because different pressure differences can cause different rotating speeds of the turboexpander 7, the high-frequency alternating current output by the generator is reduced to the frequency meeting the requirements of users by tracking the rotating speed of the turbine and adjusting the internal transformation ratio of the grid-connected cabinet 15.
The outlet pressure of different turboexpanders 7 is regulated through an expander outlet regulating valve 11 so as to meet the requirements of different industrial users; meanwhile, a control system 14 is used for monitoring an expander inlet temperature measuring point 5, an expander inlet pressure measuring point 6 and the preset maximum rotating speed of the steam flow turbine, and calculating the lowest pressure of the outlet of the turboexpander 7, so that the phenomenon that the rotating speed of the turboexpander 7 is too high and equipment is damaged due to the fact that the expander outlet regulating valve 11 is set to be too low pressure is avoided.
In this embodiment, the specific implementation steps are as follows:
1. turboexpander 7 inlet pressure protection. An expander inlet pressure measuring point 6 monitors the incoming flow pressure and is matched with an expander inlet regulating valve 4 to regulate the pressure, so that the safe operation of the system is ensured.
2. The turboexpander 7 outlet pressure is regulated. According to the requirement of a user, the outlet regulating valve 11 of the expansion machine regulates the outlet pressure of the system, and the outlet pressure of the system is monitored in real time through the outlet pressure measuring point 10 of the expansion machine.
3. The rotation speed of the turboexpander 7 is protected. The rotation speed of the turboexpander 7 is estimated by monitoring the inlet and outlet parameters of the turboexpander 7 through the equations (1) and (2), and the rotation speed is expressed by RPM.
dHis＝H1(P1,T1)-H2s(P2,T2)#(2)
Wherein P is1、T1For the inlet parameter, P, of turboexpander 72、T2Is the turboexpander 7 outlet parameter. If the RPM is calculated to be too high, the opening degree of the valve 11 is adjusted by adjusting the outlet of the expansion machine, so that P2Increasing, decreasing the enthalpy drop value dHis, eventually decreasing RPM to a reasonable value.
4. And (5) automatically controlling the starting operation of the residual pressure power generation. Firstly, monitoring whether the pressure exceeds a critical value through an expander inlet pressure measuring point 6, and adjusting the pressure by matching with an expander inlet adjusting valve 4 to ensure the normal operation of a turbo expander 7. The outlet pressure of the turboexpander 7 is monitored through an expander outlet pressure measuring point 10, and the pressure is adjusted to reach the pressure required by a user by matching with an expander outlet adjusting valve 11. The high-frequency alternating current output by the generator is reduced to the frequency meeting the requirements of users by tracking the rotating speed of the turbine and adjusting the internal transformation ratio of the grid-connected cabinet 15.
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of the present invention.
Claims (1)
1. The utility model provides a pressure governing system based on electricity generation of steam excess pressure which characterized in that: the system comprises a turbine expander (7), a generator (8), a control system (14) and a turbine rotating speed adjusting grid-connected cabinet (15); a high-pressure steam input interface (1), a steam-water separator (2), a flow meter (3), an expander inlet regulating valve (4), an expander inlet temperature measuring point (5) and an expander inlet pressure measuring point (6) are sequentially arranged on a steam inlet pipeline of a turbo expander (7) along the steam flowing direction, and an expander outlet temperature measuring point (9), an expander outlet pressure measuring point (10), an expander outlet regulating valve (11), a check valve (12) and a low-pressure steam output interface (13) are sequentially arranged on a steam outlet pipeline of the turbo expander (7) along the steam flowing direction; the turbine expansion machine (7) is coaxially connected with the generator (8), and the generator (8) is connected with the turbine rotating speed adjusting grid-connected cabinet (15); the flow meter (3), the expander inlet regulating valve (4), the expander inlet temperature measuring point (5), the expander inlet pressure measuring point (6), the generator (8), the expander outlet temperature measuring point (9), the expander outlet pressure measuring point (10), the expander outlet regulating valve (11) and the turbine rotating speed regulating grid-connected cabinet (15) are all connected with the control system (14).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109990202A (en) * | 2019-03-19 | 2019-07-09 | 华电电力科学研究院有限公司 | A kind of pressure regulating system and method based on steam top pressure power generation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109990202A (en) * | 2019-03-19 | 2019-07-09 | 华电电力科学研究院有限公司 | A kind of pressure regulating system and method based on steam top pressure power generation |
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