CN215982478U - Double dividing wall type heat exchanger frequency modulation device - Google Patents
Double dividing wall type heat exchanger frequency modulation device Download PDFInfo
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- CN215982478U CN215982478U CN202122393196.3U CN202122393196U CN215982478U CN 215982478 U CN215982478 U CN 215982478U CN 202122393196 U CN202122393196 U CN 202122393196U CN 215982478 U CN215982478 U CN 215982478U
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Abstract
The utility model provides a two dividing wall type heat exchanger frequency modulation device, includes the high pressure jar, the intermediate pressure jar, the low pressure jar, the condenser, condensate pump, subordinate low pressure heater, two dividing wall type heat exchanger bypass controlling means, higher level low pressure heater, the oxygen-eliminating device that is connected with higher level low pressure heater through the pipeline, the high pressure heater that is connected with the oxygen-eliminating device through the pipeline, the entry passes through the reheater that steam conduit connection high pressure jar steam outlet, export pass through steam conduit connection intermediate pressure jar steam inlet. The invention changes the load of the power plant unit, quickly responds to the frequency modulation requirement of the power grid on the power plant, avoids the frequent adjustment of the steam inlet regulating valve of the steam turbine when the unit modulates the frequency, ensures the safe and stable operation of the steam turbine, obviously improves the service life and the flexibility of the unit, and has the advantages of large frequency modulation amplitude, high safety, water saving and energy saving. Can be widely applied to the field of frequency modulation of power plants.
Description
Technical Field
The invention relates to a frequency modulation device of a double-dividing-wall type heat exchanger, which can be widely applied to the field of frequency modulation of power plants.
Background
With the adjustment of economic policies, the electricity utilization structure of China changes, and the electricity utilization requirements of a user side change every moment. In addition, with the gradual improvement of national environmental protection policies, the proportion of renewable energy sources such as wind energy, solar energy and the like is greatly improved, but the renewable energy sources have instability, and a power plant is required to adjust the load so as to ensure the balance of supply and demand of a power grid. In summary, because both the supply and demand sides of the power grid have instantaneous imbalance, the power grid and the frequency thereof are easily disturbed, and the frequency is an important technical index for the safe and stable operation of the power system.
At present, a power plant mainly responds to the frequency modulation requirement of a power grid by increasing or decreasing fuel of a boiler or adjusting the steam inlet quantity of a steam turbine, but the measures have certain limitations, such as delay of the boiler and limited regulation allowance of the steam turbine. In addition, other frequency modulation means exist, such as an energy storage frequency modulation mode of a storage battery and a heat storage tank, and an energy conversion frequency modulation mode of an electrode boiler and the like. The method has the problems of low frequency modulation response speed, high investment cost and high operating cost.
Disclosure of Invention
The invention aims to provide the double-dividing-wall type heat exchanger frequency modulation device which changes the load of a power plant unit, quickly responds to the frequency modulation requirement of a power plant by a power grid, avoids frequent adjustment of a steam inlet regulating valve of a steam turbine during the frequency modulation of the unit, ensures the safe and stable operation of the steam turbine, obviously improves the service life and flexibility of the unit, has large frequency modulation amplitude, high safety and water and energy conservation.
In order to achieve the purpose, the frequency modulation device of the double-dividing-wall type heat exchanger comprises a high-pressure cylinder, an intermediate-pressure cylinder connected with the high-pressure cylinder through a pipeline, a low-pressure cylinder connected with the intermediate-pressure cylinder through a pipeline, a condenser connected with the low-pressure cylinder through a pipeline, a condensate pump connected with the condenser through a pipeline, a lower-level low-pressure heater connected with the condensate pump through a pipeline, a double-dividing-wall type heat exchanger bypass control device connected with the lower-level low-pressure heater through a main pipeline, a higher-level low-pressure heater connected with the lower-level low-pressure heater through a main pipeline, a deaerator connected with the higher-level low-pressure heater through a main pipeline, a high-pressure heater connected with the deaerator through a pipeline, and a high-pressure cylinder steam outlet connected with the inlet through a steam pipeline, The outlet is connected with a reheater of the steam inlet of the intermediate pressure cylinder through a steam pipeline.
The invention relates to a frequency modulation device of a double-dividing-wall type heat exchanger, which comprises a first dividing-wall type heat exchanger, a first bypass automatic shutoff valve, a first bypass automatic regulating valve, a second bypass automatic regulating valve, a first automatic shutoff valve, a second automatic shutoff valve, a deaerator, a second automatic shutoff valve and a second automatic shutoff valve, wherein the first dividing-wall type heat exchanger is connected with a drain pipeline through a pipeline and is provided with a steam inlet interface, a drain interface, a water inlet interface and a water outlet interface, the first bypass automatic shutoff valve is connected with the first dividing-wall type heat exchanger through a pipeline, the second bypass automatic shutoff valve is connected with the first dividing-wall type heat exchanger through a pipeline and is connected with the deaerator through a pipeline, the second bypass automatic shutoff valve is connected with the first dividing-wall type heat exchanger through a pipeline, the second automatic shutoff valve is connected with the second automatic shutoff valve through a pipeline and is connected with the deaerator through a pipeline, A second wall type heat exchanger provided with a steam inlet interface, a water drainage interface, a water inlet interface and a water outlet interface, a third bypass lower automatic shutoff valve connected with the second wall type heat exchanger through a pipeline, a third bypass upper automatic shutoff valve connected with the third bypass lower automatic shutoff valve through a pipeline and connected with the main pipeline through a pipeline, a fourth bypass automatic shutoff valve connected with the second wall type heat exchanger through a pipeline and connected with an inlet of a reheater pipeline through a pipeline, a fifth bypass left automatic shutoff valve with one end connected with the pipeline between the third bypass lower automatic shutoff valve and the third bypass upper automatic shutoff valve, a fifth bypass right automatic shutoff valve connected with the fifth bypass left automatic shutoff valve through a pipeline, a middle connecting pipeline with one end connected with the pipeline between the first automatic shutoff valve and the second automatic shutoff valve and the other end connected with the pipeline between the fifth bypass left automatic shutoff valve and the fifth bypass right automatic shutoff valve, the automatic shutoff valve of the sixth bypass of pipeline between automatic shutoff valve under the third bypass and the automatic shutoff valve on the third bypass is connected to one end, the export of the heat supply network circulating pump that is connected with the automatic shutoff valve of the sixth bypass through the pipeline, the hot water circulating pump that is connected with the export of heat supply network circulating pump through the pipeline, the main road automatic shutoff valve installed on the main pipeline, the automatic control valve of connection at main road automatic shutoff valve both ends.
The double-dividing-wall type heat exchanger frequency modulation device provided by the invention has the advantages that a basic load also needs to be maintained when the frequency is not modulated, and the fast response of the frequency modulation is realized.
The invention relates to a frequency modulation device of a double-dividing-wall type heat exchanger, wherein a heat exchange medium of the bypass control device of the double-dividing-wall type heat exchanger is boiler condensed water or winter heat supply network circulating water.
The invention relates to a frequency modulation device of a double-dividing-wall type heat exchanger, wherein a first dividing-wall type heat exchanger and a second dividing-wall type heat exchanger are used for dividing-wall type heat exchange, and steam and water exchange heat through the heat exchangers.
The frequency modulation device of the double-dividing-wall type heat exchanger can automatically control and adjust the medium flow.
The frequency modulation device of the double-dividing-wall type heat exchanger needs to reduce the load of a steam dividing-wall type heat exchange frequency modulation bypass when the frequency of a power grid needs to be improved, namely the power generation load of a power plant is increased. The flow of the steam dividing wall type heat exchange frequency modulation bypass is reduced, more steam is used for generating power by the steam turbine, the load of a unit can be quickly improved, and the requirement of increasing the frequency of a power grid can be quickly responded. The working process is as follows:
(1) when the heat exchange medium is condensed water and the two dividing wall type heat exchangers run simultaneously, the main path automatic shutoff valve, the hot water circulating pump, the sixth bypass automatic shutoff valve, the fifth bypass right automatic shutoff valve and the fifth bypass left automatic shutoff valve are in a closed state, and the first bypass automatic shutoff valve, the first automatic shutoff valve, the second automatic shutoff valve, the third bypass lower automatic shutoff valve and the third bypass upper automatic shutoff valve are in an open state. The opening degrees of the second bypass automatic regulating valve and the fourth bypass automatic shutoff valve are reduced simultaneously, the steam extraction of the intermediate pressure cylinder and the inlet of the reheater is reduced, and drained water enters a drain pipeline of the upper-level low-pressure heater and a deaerator respectively. Because the extraction steam volume is reduced, in order to maintain the outlet water temperature of the dividing wall type heat exchanger at a design value, the flow of the condensate entering the frequency modulation bypass needs to be reduced, the opening degree of the automatic regulating valve is increased, and the opening degree of the automatic regulating valve of the first bypass is reduced.
(2) When the heat exchange medium is heat supply network circulating water and the two dividing wall type heat exchangers run simultaneously, the automatic regulating valve, the first bypass automatic regulating valve, the third bypass upper automatic shutoff valve, the fifth bypass right automatic shutoff valve and the fifth bypass left automatic shutoff valve are in a closed state, and the main path automatic shutoff valve, the first bypass automatic shutoff valve, the first automatic shutoff valve, the second automatic shutoff valve, the third bypass lower automatic shutoff valve, the hot water circulating pump and the sixth bypass automatic shutoff valve are in an open state. The opening degrees of the second bypass automatic regulating valve and the fourth bypass automatic shutoff valve are reduced simultaneously, the steam extraction of the intermediate pressure cylinder and the inlet of the reheater is reduced, and drained water enters a drain pipeline of the upper-level low-pressure heater and a deaerator respectively. Because the extraction steam volume is reduced, in order to maintain the outlet water temperature of the dividing wall type heat exchanger at a design value, the circulation water flow volume of the heat supply network entering the frequency modulation bypass needs to be reduced, and the frequency of the hot water circulation pump needs to be reduced.
(3) When the first dividing wall type heat exchanger operates independently, the difference with the simultaneous operation of two dividing wall type heat exchangers is that: the second automatic shutoff valve, the third bypass lower automatic shutoff valve and the fourth bypass automatic shutoff valve are in a closed state, and the fifth bypass left automatic shutoff valve is in an open state.
(4) When the second dividing wall type heat exchanger operates independently, the difference with the simultaneous operation of two dividing wall type heat exchangers is that: the first bypass automatic shutoff valve, the first automatic shutoff valve and the second bypass automatic regulating valve are in a closed state, the fifth bypass right automatic shutoff valve is in an open state, and other operations are the same as the principles of heating condensed water and heating network circulating water, and are not described again.
The frequency modulation device of the double-dividing-wall type heat exchanger reduces the power generation load of a power plant when the frequency of a power grid needs to be reduced, and increases the frequency modulation bypass load of the steam dividing-wall type heat exchanger. The flow of the steam dividing wall type heat exchange frequency modulation bypass is increased, and the method is used for reducing the steam generated by the steam turbine, rapidly reducing the load of a unit and rapidly responding to the requirement of reducing the frequency of a power grid. The working process is as follows:
(1) when the heat exchange medium is condensed water and the two dividing wall type heat exchangers run simultaneously, the valve switching condition is the same as the increase of the power grid frequency; the opening of the automatic shutoff valve on the second bypass automatic regulating valve and the third bypass is simultaneously increased, the steam extraction amount of the intermediate pressure cylinder and the inlet of the reheater is increased, and drain water respectively enters a drain pipeline of the upper-level low-pressure heater and the deaerator. Because the extraction steam volume increases, in order to keep the outlet water temperature of the dividing wall type heat exchanger at a design value, the flow of the condensate entering the frequency modulation bypass needs to be increased, the opening degree of the automatic regulating valve is reduced, and the opening degree of the automatic regulating valve of the first bypass is increased.
(2) When the heat exchange medium is heat supply network circulating water and the two partition wall type heat exchangers run simultaneously, the valve switching condition is the same as the increase of the power grid frequency; and the opening of the automatic shutoff valve on the second bypass automatic regulating valve and the third bypass is simultaneously increased, the steam extraction of the intermediate pressure cylinder and the inlet of the reheater is increased, and drain water respectively enters a drain pipeline of the upper-level low-pressure heater and a deaerator. Because the extraction steam quantity is increased, in order to maintain the outlet water temperature of the dividing wall type heat exchanger at a design value, the circulation water flow quantity of the heat supply network entering the frequency modulation bypass needs to be increased, and the frequency of the hot water circulation pump needs to be increased.
(3) When the first dividing wall type heat exchanger and the second dividing wall type heat exchanger operate independently, the valve closing condition is the same as the principle of increasing the power grid frequency, and other operations are the same as the principles of heating condensed water and heating network circulating water, and are not repeated.
According to the frequency modulation device of the double-dividing-wall type heat exchanger, the second dividing-wall type heat exchanger is positioned at the water outlet interface of the first dividing-wall type heat exchanger, and the steam quality of the second dividing-wall type heat exchanger is superior to that of the first dividing-wall type heat exchanger.
According to the double-dividing-wall type heat exchanger frequency modulation device, the load of a unit is changed by increasing or reducing the steam flow of the high-pressure cylinder and the medium-pressure cylinder of the steam turbine, the frequency modulation requirement of a power plant by a power grid is quickly responded, the frequent adjustment of the steam inlet regulating valve of the steam turbine during the frequency modulation of the unit is avoided, the safe and stable operation of the steam turbine is ensured, and the service life and the flexibility of the unit are obviously improved.
The double-dividing-wall type heat exchanger frequency modulation device can be provided with one or two dividing-wall type heat exchangers for frequency modulation, and once one of the two dividing-wall type heat exchangers needs to be maintained, the normal work is not influenced, so that the double-dividing-wall type heat exchanger frequency modulation device has the advantages of large frequency modulation amplitude and high safety.
The first and second dividing wall type heat exchangers can heat the boiler condensed water or the winter heat network circulating water, and the drainage of the dividing wall type heat exchanger can enter a deaerator or a low heater drainage pipeline for recycling, so that water is saved.
The double-dividing-wall type heat exchanger frequency modulation device realizes zero heat loss in the frequency modulation process, thereby saving energy.
In conclusion, the double-dividing-wall type heat exchanger frequency modulation device changes the load of a power plant unit, quickly responds to the frequency modulation requirement of a power grid on the power plant, avoids frequent adjustment of a steam inlet regulating valve of a steam turbine during frequency modulation of the unit, ensures safe and stable operation of the steam turbine, obviously improves the service life and flexibility of the unit, and has the advantages of large frequency modulation amplitude, high safety, water saving and energy saving.
Drawings
The invention will be further described with reference to the accompanying drawings and examples thereof.
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
In fig. 1, the frequency modulation device of the double dividing wall type heat exchanger of the invention comprises a high pressure cylinder 1, a middle pressure cylinder 2 connected with the high pressure cylinder through a pipeline, a low pressure cylinder 3 connected with the middle pressure cylinder through a pipeline, a condenser 4 connected with the low pressure cylinder through a pipeline, a condensate pump 5 connected with the condenser through a pipeline, a lower stage low pressure heater 6 connected with the condensate pump through a pipeline, a double dividing wall type heat exchanger bypass control device 7 connected with the lower stage low pressure heater through a main pipeline 12, a higher stage low pressure heater 8 connected with the middle pressure cylinder through a main pipeline, a deaerator 9 connected with the higher stage low pressure heater through a pipeline, and a high pressure heater 10 connected with the deaerator through a pipeline, wherein the double dividing wall type heat exchanger bypass control device is connected with the double dividing wall type heat exchanger bypass control device through a main pipeline 12, the lower stage low pressure heater is connected with the lower stage low pressure heater through a drain pipeline 13, the inlet is connected with the steam outlet of the high-pressure cylinder through a steam pipeline, and the outlet is connected with the reheater 11 of the steam inlet of the intermediate-pressure cylinder through a steam pipeline.
The invention relates to a frequency modulation device of a double-dividing-wall type heat exchanger, wherein a bypass control device 7 of the double-dividing-wall type heat exchanger comprises a first dividing-wall type heat exchanger 7-1 which is connected with a drain pipeline through a pipeline and is provided with a steam inlet interface, a drain interface, a water inlet interface and a water outlet interface, a first bypass automatic shutoff valve 7-2 which is connected with the first dividing-wall type heat exchanger through a pipeline, a first bypass automatic regulating valve 7-3 which is connected with the first bypass automatic shutoff valve through a pipeline and is also connected with a main pipeline through a pipeline, a second bypass automatic regulating valve 7-4 which is connected with the first dividing-wall type heat exchanger through a pipeline and is also connected with a steam extraction pipeline of a medium pressure cylinder through a pipeline, a first automatic shutoff valve 7-5 which is connected with the first dividing-wall type heat exchanger through a pipeline, and a second automatic shutoff valve 7-6 which is connected with the first automatic shutoff valve through a pipeline, a second double wall heat exchanger 7-7 which is connected with the second automatic shutoff valve through a pipeline, is connected with the deaerator through a pipeline and is provided with a steam inlet, a water drain, a water inlet and a water outlet, a third bypass lower automatic shutoff valve 7-8 which is connected with the second double wall heat exchanger through a pipeline, a third bypass upper automatic shutoff valve 7-9 which is connected with the third bypass lower automatic shutoff valve through a pipeline and is connected with the main pipeline through a pipeline, a fourth bypass automatic shutoff valve 7-10 which is connected with the second double wall heat exchanger through a pipeline and is connected with the inlet of the reheater pipeline through a pipeline, a fifth bypass left automatic shutoff valve 7-11 of which one end is connected with the pipeline between the third bypass lower automatic shutoff valve and the automatic shutoff valve on the third bypass, and a fifth bypass right automatic shutoff valve 7-12 which is connected with the fifth bypass left automatic shutoff valve through a pipeline, the automatic shut-off valve comprises a middle connecting pipeline 7-13, one end of the middle connecting pipeline is connected to a pipeline between a first automatic shut-off valve and a second automatic shut-off valve, the other end of the middle connecting pipeline is connected to a pipeline between a fifth bypass left automatic shut-off valve and a fifth bypass right automatic shut-off valve, a sixth bypass automatic shut-off valve 7-14, one end of the sixth bypass automatic shut-off valve is connected to a pipeline between a third bypass lower automatic shut-off valve and a third bypass upper automatic shut-off valve, a heat network circulating pump outlet 7-15, one end of the heat network circulating pump outlet 7-16, a main pipeline automatic shut-off valve 7-17 and an automatic regulating valve 7-18, wherein the main pipeline automatic shut-off valve 7-17 is installed on the main pipeline, and the automatic regulating valve 7-18 is connected to two ends of the main pipeline automatic shut-off valve.
The double-dividing-wall type heat exchanger frequency modulation device provided by the invention has the advantages that a basic load also needs to be maintained when the frequency is not modulated, and the fast response of the frequency modulation is realized.
The invention relates to a frequency modulation device of a double-dividing-wall type heat exchanger, wherein a heat exchange medium of the bypass control device of the double-dividing-wall type heat exchanger is boiler condensed water or winter heat supply network circulating water.
The invention relates to a frequency modulation device of a double-dividing-wall type heat exchanger, wherein a first dividing-wall type heat exchanger and a second dividing-wall type heat exchanger are used for dividing-wall type heat exchange, and steam and water exchange heat through the heat exchangers.
The frequency modulation device of the double-dividing-wall type heat exchanger can automatically control and adjust the medium flow.
In view of the foregoing, it is intended that the present invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims; any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention by those skilled in the art can be made without departing from the technical scope of the present invention, and still fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. The frequency modulation device is characterized by comprising a high-pressure cylinder, an intermediate-pressure cylinder connected with the high-pressure cylinder through a pipeline, a low-pressure cylinder connected with the intermediate-pressure cylinder through a pipeline, a condenser connected with the low-pressure cylinder through a pipeline, a condensate pump connected with the condenser through a pipeline, a subordinate low-pressure heater connected with the condensate pump through a pipeline, a double-dividing-wall type heat exchanger bypass control device connected with the subordinate low-pressure heater through a main pipeline, a superior low-pressure heater connected with the subordinate low-pressure heater through a main pipeline, a deaerator connected with the superior low-pressure heater through a main pipeline, a high-pressure heater connected with the deaerator through a pipeline, and a steam outlet of the high-pressure cylinder, a steam outlet, a, The outlet is connected with a reheater of the steam inlet of the intermediate pressure cylinder through a steam pipeline.
2. The fm apparatus of claim 1, wherein the bypass control device comprises a first dividing wall type heat exchanger connected to the drain line via a conduit and having an inlet port, a drain port, an inlet port and an outlet port, a first bypass automatic shutoff valve connected to the first dividing wall type heat exchanger via a conduit, a first bypass automatic control valve connected to the first bypass automatic shutoff valve via a conduit and to the main conduit, a second bypass automatic control valve connected to the first dividing wall type heat exchanger via a conduit and to the intermediate pressure cylinder extraction conduit via a conduit, a first automatic shutoff valve connected to the first dividing wall type heat exchanger via a conduit, a second automatic shutoff valve connected to the first automatic shutoff valve via a conduit, a second automatic shutoff valve connected to the deaerator via a conduit and to the deaerator via a conduit, A second wall type heat exchanger provided with a steam inlet interface, a water drainage interface, a water inlet interface and a water outlet interface, a third bypass lower automatic shutoff valve connected with the second wall type heat exchanger through a pipeline, a third bypass upper automatic shutoff valve connected with the third bypass lower automatic shutoff valve through a pipeline and connected with the main pipeline through a pipeline, a fourth bypass automatic shutoff valve connected with the second wall type heat exchanger through a pipeline and connected with an inlet of a reheater pipeline through a pipeline, a fifth bypass left automatic shutoff valve with one end connected with the pipeline between the third bypass lower automatic shutoff valve and the third bypass upper automatic shutoff valve, a fifth bypass right automatic shutoff valve connected with the fifth bypass left automatic shutoff valve through a pipeline, a middle connecting pipeline with one end connected with the pipeline between the first automatic shutoff valve and the second automatic shutoff valve and the other end connected with the pipeline between the fifth bypass left automatic shutoff valve and the fifth bypass right automatic shutoff valve, the automatic shutoff valve of the sixth bypass of pipeline between automatic shutoff valve under the third bypass and the automatic shutoff valve on the third bypass is connected to one end, the export of the heat supply network circulating pump that is connected with the automatic shutoff valve of the sixth bypass through the pipeline, the hot water circulating pump that is connected with the export of heat supply network circulating pump through the pipeline, the main road automatic shutoff valve installed on the main pipeline, the automatic control valve of connection at main road automatic shutoff valve both ends.
3. A dual-dividing wall heat exchanger fm apparatus as claimed in claim 1, wherein the dual-dividing wall heat exchanger bypass control apparatus maintains a base load even when not fm, thereby achieving fast response to fm modulation.
4. The dual-dividing-wall heat exchanger frequency modulation device as claimed in claim 1, wherein the heat exchange medium of the dual-dividing-wall heat exchanger bypass control device is boiler condensed water or winter heat network circulating water.
5. A dual dividing wall heat exchanger frequency tuning device as claimed in claim 2, wherein said first dividing wall heat exchanger is a dividing wall heat exchanger, and wherein steam and water exchange heat through the heat exchanger.
6. A dual dividing wall heat exchanger frequency tuning device as claimed in claim 2, wherein said second dividing wall heat exchanger is a dividing wall heat exchanger, and wherein steam and water exchange heat through the heat exchanger.
7. A fm apparatus for a double-dividing wall heat exchanger as claimed in claim 2, wherein said hot water circulating pump is capable of automatically controlling the flow of the conditioning medium.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122393196.3U CN215982478U (en) | 2021-09-30 | 2021-09-30 | Double dividing wall type heat exchanger frequency modulation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122393196.3U CN215982478U (en) | 2021-09-30 | 2021-09-30 | Double dividing wall type heat exchanger frequency modulation device |
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| CN215982478U true CN215982478U (en) | 2022-03-08 |
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| CN202122393196.3U Active CN215982478U (en) | 2021-09-30 | 2021-09-30 | Double dividing wall type heat exchanger frequency modulation device |
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- 2021-09-30 CN CN202122393196.3U patent/CN215982478U/en active Active
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