CN211819537U - Thermodynamic system for communicating steam exhaust devices of double-backpressure heat supply unit - Google Patents
Thermodynamic system for communicating steam exhaust devices of double-backpressure heat supply unit Download PDFInfo
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- CN211819537U CN211819537U CN201822115589.6U CN201822115589U CN211819537U CN 211819537 U CN211819537 U CN 211819537U CN 201822115589 U CN201822115589 U CN 201822115589U CN 211819537 U CN211819537 U CN 211819537U
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Abstract
The utility model provides a thermodynamic system for two backpressure heat supply unit steam extraction device intercommunications, the system includes low pressure steam extraction device and high pressure steam extraction device, through the female pipe intercommunication of intercommunication between low pressure steam extraction device and the high pressure steam extraction device, the intercommunication has the lateral line on the female pipe of intercommunication, is first lateral pipe, second lateral pipe and third lateral pipe respectively, sets up the female pipe shut-off valve of intercommunication on the female pipe of intercommunication, is provided with first shut-off valve on first lateral pipe, is provided with the second shut-off valve on the second lateral pipe, is provided with the third shut-off valve on the third lateral pipe. The utility model discloses can reduce unit generated power, increase heating area reduces the electricity generation coal consumption, improves hot economic nature.
Description
Technical Field
The utility model relates to a field is reformed transform to thermal power plant's heat supply unit's flexibility, concretely relates to a thermodynamic system that is used for two back pressure heat supply unit steam extraction device to communicate.
Background
With the increasing of the installed capacity of new energy in the 'three north' region, the electricity demand is slowly increased, the heat supply demand is increased year by year, the phenomena of wind and light abandonment of new energy items are increasingly serious, the online power generation of new energy is limited, the investment waste is caused, and the energy conservation and emission reduction are also very unfavorable. In order to alleviate the problem, flexibility improvement and transformation of the thermal power generating unit are very important, the original combined heat and power generation operation mode is broken through, the external heat supply capacity of the heat supply unit is improved, the power generation capacity of the power grid is reduced, and the load space of power generation on the power grid is provided for wind power and photovoltaic.
The heat supply transformation is one of the main technical directions of reducing the coal consumption of power supply of the thermal power generating unit, and particularly, the unit is transformed from pure condensation working condition operation to back pressure working condition operation, so that the external heat supply amount of the unit can be increased, the coal consumption of the unit is greatly reduced, and considerable economic benefit is brought to the thermal power generating unit.
Generally speaking, for a double-backpressure heat supply unit, two steam exhaust devices with different pressure levels need to convey low-pressure condensed water to a higher-pressure steam exhaust device through a delivery pump, so that the balance of the amount of the condensed water between the two steam exhaust devices and the relative stability of the water level are realized.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a thermodynamic system for two backpressure heat supply unit steam extraction device intercommunications to the technical problem of the condensate water balance between two steam extraction devices and water level relatively stable when solving two backpressure heat supply unit operations in winter realizes the water yield automatic balance under the different operation backpressures, does not consume extra equipment and power.
In order to realize the purpose, a thermodynamic system communicated with the steam exhaust device of the double-backpressure heat supply unit is provided, and the specific technical scheme is as follows: the system comprises a low-pressure steam exhaust device (1) and a high-pressure steam exhaust device (2), wherein the low-pressure steam exhaust device (1) is communicated with the high-pressure steam exhaust device (2) through a communication main pipe (3); branch pipelines, namely a first branch pipe (6), a second branch pipe (8) and a third branch pipe (10), are communicated with the communication main pipe (3); a communicating main pipe shut-off valve (4) is arranged on the communicating main pipe, a first shut-off valve (5) is arranged on the first branch pipe (6), a second shut-off valve (7) is arranged on the second branch pipe (8), and a third shut-off valve (9) is arranged on the third branch pipe (10).
As a preferable scheme, a low-pressure steam exhaust device pressure gauge (12) and a low-pressure steam exhaust device water level gauge (14) are connected to the steam side of the low-pressure steam exhaust device (1), and the interface of condensed water and low-pressure steam is the low-pressure steam exhaust device water level (16); the steam side of the high-pressure steam exhaust device (2) is connected with a high-pressure steam exhaust device pressure gauge (13) and a high-pressure steam exhaust device water level gauge (15), and the interface of condensed water and high-pressure steam is the high-pressure steam exhaust device water level (17).
Preferably, the communication main pipe (3) is arranged on the side surface of the high-pressure steam exhaust device (2), and the first branch pipe (6), the second branch pipe (8) and the third branch pipe (10) are horizontally connected to the side surface of the low-pressure steam exhaust device (1).
As a preferred scheme, the communication main pipe (3) is arranged at the bottom of the high-pressure steam exhaust device (2), and the first branch pipe (6), the second branch pipe (8) and the third branch pipe (10) are all connected to the bottom of the low-pressure steam exhaust device (1) and vertically enter the low-pressure steam exhaust device (1).
As a preferable scheme, the system comprises a condensate pump (11), wherein the condensate pump (11) is arranged at the bottom of the low-pressure steam exhaust device (1), and condensate water of the low-pressure steam exhaust device (1) and the high-pressure steam exhaust device (2) is conveyed to a thermodynamic system to realize thermodynamic working medium circulation.
As a preferred scheme, the difference value of the water level of the low-pressure steam exhaust device and the water level of the high-pressure steam exhaust device in the vertical direction is set to be delta h mm, and when the water level of the low-pressure steam exhaust device is higher than the water level of the high-pressure steam exhaust device, the delta h takes a negative value; when the water level of the low-pressure steam exhaust device is lower than that of the high-pressure steam exhaust device, the delta h takes a positive value;
setting the height difference between the top end of the third branch pipe (10) and the water level of the low-pressure steam exhaust device to be H mm; h ═ Δ H +1000 × Δ P/(ρ g), where Δ P is the maximum pressure difference between the two steam exhausts, Pa; rho is the average density of condensed water in the two steam exhaust devices, kg/m3(ii) a g is the acceleration of gravity, m/s2。
The vertical distances among the water level of the low-pressure steam exhaust device, the horizontal central axis of the first branch pipe (6), the horizontal central axis of the second branch pipe (8) and the horizontal central axis of the third branch pipe (10) are all H/3 mm.
As a preferable scheme, the range of the pressure difference Δ P when the two steam exhaust devices operate at different pressures is set to be 0- Δ Pmax, wherein Δ Pmax is the maximum pressure difference between the high-pressure steam exhaust device and the low-pressure steam exhaust device;
when the turbo generator set operates in a non-heating period, the delta P is 0, the first shut-off valve, the second shut-off valve and the third shut-off valve are in a shut-off state, and the communicating main pipe shut-off valve is in an open state;
when turbo generator set was operated in the heating season, two low pressure jar were moved under different exhaust steam pressure, specifically are:
when the delta P is more than 0 and less than or equal to delta Pmax/3, the steam exhaust device is communicated with the main pipe shut-off valve, the second shut-off valve and the third shut-off valve to be in a closed state, and the first shut-off valve is in an open state;
when delta Pmax/3 is less than or equal to delta P (2 delta Pmax)/3, the steam exhaust device is communicated with the main pipe shut-off valve, the first shut-off valve and the third shut-off valve to be in a closed state, and the second shut-off valve is in an open state;
when (2 delta Pmax)/3< delta P is less than or equal to delta Pmax, the steam exhaust device is communicated with the main pipe shut-off valve, the first shut-off valve and the second shut-off valve to be in a closed state, and the third shut-off valve is in an open state.
The beneficial effects of the utility model reside in that:
1) the pressure difference between the two steam exhaust devices is used for driving the condensed water at the high-pressure side to be discharged to the steam exhaust device at the low-pressure side, so that the configuration of a thermodynamic system is simplified; 2) the self-balance of the water level between the double-backpressure steam exhaust devices is realized by utilizing the pressure difference and the water level difference between the two steam exhaust devices through valve switching; 3) the configuration of a condensate water delivery pump is omitted, and the service power consumption is reduced; 4) the utility model is not only suitable for the newly built unit, but also suitable for the heat supply reconstruction of the old unit; 5) the high-pressure condensed water is conveyed to the low-pressure side steam exhaust device, so that the high-efficiency operation of a regenerative system is facilitated, and the operation reliability of a condensed water pump is improved.
Drawings
Fig. 1 is a schematic view of a thermodynamic system with a steam exhaust device of a double back pressure heat supply unit communicated (horizontally arranged) according to the present invention;
FIG. 2 is a schematic view of thermal monitoring measuring points of the steam exhaust device of the double back pressure heat supply unit of the present invention;
fig. 3 is a schematic view of a thermodynamic system with the steam exhaust devices of the double back pressure heat supply unit communicated (vertically arranged) according to the present invention;
description of reference numerals:
1. a low pressure steam exhaust; 2. a high pressure steam exhaust device; 3. the main pipe is communicated; 4. a shut-off valve communicated with the main pipe; 5. a first shut-off valve; 6. a first branch pipe; 7. a second shutoff valve; 8. a second branch pipe; 9. a third shutoff valve; 10. a third branch pipe; 11. a condensate pump; 12. a low pressure exhaust steam device pressure gauge; 13. a pressure gauge of the high-pressure steam exhaust device; 14. a low pressure steam exhaust device water level gauge; 15. a high pressure steam exhaust device water level gauge; 16. a low pressure steam exhaust device water level; 17. high pressure steam exhaust device water level.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings and examples. It should be noted that the embodiments and technical features thereof may be combined with each other in the case where there is no conflict.
Example 1
The embodiment provides a thermodynamic system of two backpressure heat supply unit steam extraction device intercommunications (horizontal arrangement), as shown in fig. 1 and 2, connect through communicating female pipe 3 between low pressure steam extraction device 1 and the high pressure steam extraction device 2, be provided with communicating female pipe shut-off valve 4 on communicating female pipe 3, the switch through this valve realizes two steam extraction device intercommunication and the flow of the condensate water when isobaric running state, realizes the water level between two steam extraction devices and the balance of the condensate water. And a condensate pump 11 is arranged at the bottom of the low-pressure steam exhaust device 1, and condensate water of the two steam exhaust devices is conveyed to a thermodynamic system to realize thermodynamic working medium circulation. The steam side of the low-pressure steam exhaust device 1 is connected with a low-pressure steam exhaust device pressure gauge 12 and a low-pressure steam exhaust device water level gauge 14, and the interface of condensed water and low-pressure steam is a low-pressure steam exhaust device water level 16; the steam side of the high-pressure steam exhaust device 2 is connected with a high-pressure steam exhaust device pressure gauge 13 and a high-pressure steam exhaust device water level gauge 15, and the interface of condensed water and high-pressure steam is a high-pressure steam exhaust device water level 17.
The main pipe 3 of the steam exhaust device is connected with branch pipes, namely a first branch pipe 6, a second branch pipe 8 and a third branch pipe 10, the first branch pipe 6 is provided with a first shut-off valve 5, the second branch pipe 8 is provided with a second shut-off valve 7, and the third branch pipe 8 is provided with a third shut-off valve 9.
The three branch pipes are all horizontally arranged and connected to the side surface of the low-pressure steam exhaust device. The height difference between the horizontal central axis of the third branch pipe 10 and the water level 16 of the low-pressure steam exhaust device is H mm; h ═ Δ H +1000 × Δ P/(ρ g), where Δ P is the maximum pressure difference between the two steam exhausts, Pa; rho is condensed water in two steam exhaust devicesAverage density, kg/m3(ii) a g is the acceleration of gravity, m/s2. The difference value of the water level 16 of the low-pressure steam exhaust device and the water level 17 of the high-pressure steam exhaust device in the vertical direction is delta h mm, and when the water level 16 of the low-pressure steam exhaust device is higher than the water level 17 of the high-pressure steam exhaust device, delta h takes a negative value; when the low pressure exhaust level 16 is lower than the high pressure exhaust level 17, Δ h takes a positive value. The vertical distances among the water level 16 of the low-pressure steam exhaust device, the horizontal central axis of the first branch pipe 6, the horizontal central axis of the second branch pipe 8 and the horizontal central axis of the third branch pipe 10 are all H/3 mm.
The pressure difference delta P of the two steam exhaust devices when the two steam exhaust devices operate at different pressures ranges from 0 to delta Pmax, wherein the delta Pmax is the maximum pressure difference between the high-pressure steam exhaust device and the low-pressure steam exhaust device.
When the steam turbine generator unit operates in a non-heating period, lower unit back pressure needs to be kept, the operating pressure of the two steam exhaust devices is the same, namely, the delta P is 0, the communicating main pipe shut-off valve is opened by closing the first shut-off valve, the second shut-off valve and the third shut-off valve, and the balance of the condensed water quantity between the two steam exhaust devices is realized.
When the turbo generator set operates in a heating season, the two low-pressure cylinders need to operate under different steam exhaust pressures, a communication pipeline and a valve between the two steam exhaust devices are switched according to pressure difference and water level difference between the two steam exhaust devices, condensed water in the high-pressure side steam exhaust device can automatically flow to the low-pressure side steam exhaust device, the self-balance of the amount of condensed water between the two steam exhaust devices is kept, the relative stability of the pressure and the water level in the two steam exhaust devices is guaranteed, and therefore the safe and stable operation of the unit under the double-back-pressure operation working condition is achieved. The method comprises the following steps:
when the delta P is more than 0 and less than or equal to delta Pmax/3, the steam exhaust device is closed to communicate the main pipe shut-off valve, the second shut-off valve and the third shut-off valve, and the first shut-off valve is opened, so that the balance of the amount of condensed water between the two steam exhaust devices is realized.
When delta Pmax/3 is less than or equal to delta P (2 delta Pmax)/3, the steam exhaust device is closed to communicate the main pipe shut-off valve, the first shut-off valve and the third shut-off valve, and the second shut-off valve is opened, so that the balance of the amount of condensed water between the two steam exhaust devices is realized.
When (2 delta Pmax)/3< delta P is less than or equal to delta Pmax, the steam exhaust device is closed to communicate the main pipe shut-off valve, the first shut-off valve and the second shut-off valve, and the third shut-off valve is opened, so that the balance of the condensed water quantity between the two steam exhaust devices is realized.
Example 2
The embodiment provides a thermodynamic system with communicated (vertically arranged) steam exhaust devices of a double-backpressure heat supply unit, as shown in fig. 3, a steam exhaust device communicated main pipe 3 is arranged at the bottom of a high-pressure steam exhaust device 2, a first branch pipe 6, a second branch pipe 8 and a third branch pipe 10 are all connected to the bottom of a low-pressure steam exhaust device and are vertically arranged inside the low-pressure steam exhaust device 1, and a first shut-off valve 5, a second shut-off valve 7 and a third shut-off valve 9 are respectively arranged on corresponding pipelines of the low-pressure steam exhaust device. The height difference between the top end of the third branch pipe 10 and the water level 16 of the low-pressure steam exhaust device is H mm, H is delta H +1000 delta P/(rho g), wherein delta P is the maximum pressure difference between the two steam exhaust devices, Pa; rho is the average density of condensed water in the two steam exhaust devices, kg/m3(ii) a g is the acceleration of gravity, m/s2. The vertical distances among the water level 16 of the low-pressure steam exhaust device, the top end of the first branch pipe 6, the top end of the second branch pipe 8 and the top end of the third branch pipe 10 which are adjacent to each other are all H/3 mm. The switching principle of the pipeline valve of the high-low pressure steam exhaust device in variable working condition operation is similar to that of the embodiment 1 (horizontal arrangement mode), and the description is omitted.
The embodiments in the above embodiments can be further combined or replaced, and the embodiments are only described in the preferred embodiments of the present invention, which are not limited to the concept and scope of the present invention, and without departing from the design concept of the present invention, various changes and improvements made by the technical solutions of the present invention by those skilled in the art all belong to the protection scope of the present invention.
Claims (7)
1. The utility model provides a thermodynamic system for two backpressure heat supply unit steam extraction device intercommunications, the system includes low pressure steam extraction device (1) and high pressure steam extraction device (2), its characterized in that: the low-pressure steam exhaust device (1) is communicated with the high-pressure steam exhaust device (2) through a communication main pipe (3); branch pipelines, namely a first branch pipe (6), a second branch pipe (8) and a third branch pipe (10), are communicated with the communication main pipe (3); a communicating main pipe shut-off valve (4) is arranged on the communicating main pipe, a first shut-off valve (5) is arranged on the first branch pipe (6), a second shut-off valve (7) is arranged on the second branch pipe (8), and a third shut-off valve (9) is arranged on the third branch pipe (10).
2. The thermodynamic system for communication between exhaust devices of a double back pressure heating unit according to claim 1, wherein: a low-pressure steam exhaust device pressure gauge (12) and a low-pressure steam exhaust device water level gauge (14) are connected to the steam side of the low-pressure steam exhaust device (1); the steam side of the high-pressure steam exhaust device (2) is connected with a high-pressure steam exhaust device pressure gauge (13) and a high-pressure steam exhaust device water level gauge (15).
3. The thermodynamic system for communication between exhaust devices of a double back pressure heating unit according to claim 1, wherein: the communication main pipe (3) is arranged on the side face of the high-pressure steam exhaust device (2), and the first branch pipe (6), the second branch pipe (8) and the third branch pipe (10) are horizontally connected to the side face of the low-pressure steam exhaust device (1).
4. The thermodynamic system for communication between exhaust devices of a double back pressure heating unit according to claim 1, wherein: the communication main pipe (3) is arranged at the bottom of the high-pressure steam exhaust device (2), and the first branch pipe (6), the second branch pipe (8) and the third branch pipe (10) are all connected to the bottom of the low-pressure steam exhaust device (1) and vertically enter the interior of the low-pressure steam exhaust device (1).
5. The thermodynamic system for communication between exhaust devices of a double back pressure heating unit according to claim 1, wherein: the system comprises a condensate pump (11), wherein the condensate pump (11) is arranged at the bottom of the low-pressure steam exhaust device (1), and condensate water of the low-pressure steam exhaust device (1) and the high-pressure steam exhaust device (2) is conveyed to a thermodynamic system to realize thermodynamic working medium circulation.
6. The thermodynamic system for communication between exhaust devices of a double back pressure heating unit according to claim 1, wherein: setting the difference value of the water level of the low-pressure steam exhaust device and the water level of the high-pressure steam exhaust device in the vertical direction to be delta h mm, and taking a negative value for delta h when the water level of the low-pressure steam exhaust device is higher than the water level of the high-pressure steam exhaust device; when the water level of the low-pressure steam exhaust device is lower than that of the high-pressure steam exhaust device, the delta h takes a positive value;
setting the height difference between the top end of the third branch pipe (10) and the water level of the low-pressure steam exhaust device as H mm, wherein H is delta H +1000 delta P/(rho g), and delta P is the maximum pressure difference between the two steam exhaust devices and Pa; rho is the average density of condensed water in the two steam exhaust devices, kg/m3(ii) a g is the acceleration of gravity, m/s2；
The vertical distances among the water level of the low-pressure steam exhaust device, the horizontal central axis of the first branch pipe (6), the horizontal central axis of the second branch pipe (8) and the horizontal central axis of the third branch pipe (10) are all H/3 mm.
7. The thermodynamic system for communication between exhaust devices of a double back pressure heating unit according to any one of claims 1 to 6, wherein:
setting the range of pressure difference delta P between two steam exhaust devices when the two steam exhaust devices operate at different pressures to be 0-delta Pmax, wherein the delta Pmax is the maximum pressure difference between the high-pressure steam exhaust device and the low-pressure steam exhaust device;
when the turbo generator set operates in a non-heating period, the delta P is 0, the first shut-off valve, the second shut-off valve and the third shut-off valve are in a shut-off state, and the communicating main pipe shut-off valve is in an open state;
when turbo generator set was operated in the heating season, two low pressure jar were moved under different exhaust steam pressure, specifically are:
when the delta P is more than 0 and less than or equal to delta Pmax/3, the steam exhaust device is communicated with the main pipe shut-off valve, the second shut-off valve and the third shut-off valve to be in a closed state, and the first shut-off valve is in an open state;
when delta Pmax/3 is less than or equal to delta P (2 delta Pmax)/3, the steam exhaust device is communicated with the main pipe shut-off valve, the first shut-off valve and the third shut-off valve to be in a closed state, and the second shut-off valve is in an open state;
when (2 delta Pmax)/3< delta P is less than or equal to delta Pmax, the steam exhaust device is communicated with the main pipe shut-off valve, the first shut-off valve and the second shut-off valve to be in a closed state, and the third shut-off valve is in an open state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822115589.6U CN211819537U (en) | 2018-12-17 | 2018-12-17 | Thermodynamic system for communicating steam exhaust devices of double-backpressure heat supply unit |
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| CN201822115589.6U CN211819537U (en) | 2018-12-17 | 2018-12-17 | Thermodynamic system for communicating steam exhaust devices of double-backpressure heat supply unit |
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