CN217653946U - Peak-shaving heat supply and energy-saving system of gas-steam combined cycle heat supply unit - Google Patents
Peak-shaving heat supply and energy-saving system of gas-steam combined cycle heat supply unit Download PDFInfo
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- CN217653946U CN217653946U CN202122701728.5U CN202122701728U CN217653946U CN 217653946 U CN217653946 U CN 217653946U CN 202122701728 U CN202122701728 U CN 202122701728U CN 217653946 U CN217653946 U CN 217653946U
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Abstract
The utility model provides a gas steam combined cycle heat supply unit peak regulation heat supply and economizer system realizes the unit peak regulation and stops the heat supply, returns the unit electricity generation and the waste heat utilization with heat accumulation steam, a serial communication port, include: the system comprises a saturated steam heat storage device, a superheated steam heat storage device and a natural gas preheating system, wherein the natural gas preheating system comprises a second heat exchanger, a third heat exchanger, a thermoelectric mixed heater and a pressure regulating branch; a heat medium channel inlet of the second heat exchanger is connected with an outlet of the medium-pressure economizer, and a heat medium channel outlet of the second heat exchanger is connected with a heat medium channel inlet of the third heat exchanger; the fluid channel inlet of the third heat exchanger is connected with a natural gas source, the fluid channel outlet of the third heat exchanger is connected to the fluid channel inlet of the second heat exchanger through the pressure regulating branch, and the fluid channel outlet of the second heat exchanger is connected to the gas turbine; the heat medium channel of the thermoelectric hybrid heater is connected to the main heat supply pipe, and the outlet of the fluid channel of the thermoelectric hybrid heater is merged to the heat medium pipeline between the second heat exchanger and the third heat exchanger.
Description
Technical Field
The utility model relates to an energy recuperation technique among the electric power field, concretely relates to peak shaving heat supply and economizer system of gas steam combined cycle heat supply unit.
Background
At present, a gas-steam combined cycle heat supply unit is a heat-power-fixed-electricity continuous operation unit, a starting furnace is usually arranged to meet the requirement of steam for starting the unit, and the starting furnace can be used for emergency heat supply when the unit is in an accident. Under the condition of facing high-proportion renewable energy, the combined cycle heat supply unit needs to be peak-regulated and shut down, and only the shutdown accident heat supply of the combined cycle unit and the startup boiler can be used for maintaining heat supply, the accident heat supply can only be maintained for 1 hour, and the startup boiler is lack of stability in continuous operation, so that the risk of heat supply system heat supply interruption exists. Meanwhile, in the shutdown process of the combined cycle unit, each steam bypass is opened to the condenser and the waste heat boiler for pollution discharge, and water is discharged to the fixed discharge flash tank and then is discharged to the trench after being cooled, so that heat waste is caused, and the lithium bromide refrigerator directly discharges the trench without recycling auxiliary steam, so that heat and working medium waste is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a gas steam combined cycle heat supply unit peak regulation heat supply and economizer system for the unit peak regulation is shut down the heat supply, is returned the unit electricity generation and waste heat utilization with heat accumulation steam, and it specifically realizes through following technological means:
the utility model discloses a peak regulation heat supply and economizer system of gas steam combined cycle heat supply unit includes:
the input port of the saturated steam heat storage device is connected with a low-pressure steam bypass of the unit, and the output port of the saturated steam heat storage device is connected with a first heat exchanger which is used for providing a heat source for a water body;
the input port of the superheated steam heat storage device is connected with a high-medium pressure steam bypass of the unit, and the output port of the superheated steam heat storage device is connected with a main heat supply pipe of the unit;
the natural gas preheating system comprises a second heat exchanger, a third heat exchanger, a thermoelectric mixed heater and a pressure regulating branch; a heat medium channel inlet of the second heat exchanger is connected with an outlet of the medium-pressure economizer, and a heat medium channel outlet of the second heat exchanger is connected with a heat medium channel inlet of the third heat exchanger; the fluid channel inlet of the third heat exchanger is connected with a natural gas source, the fluid channel outlet of the third heat exchanger is connected to the fluid channel inlet of the second heat exchanger through the pressure regulating branch, and the fluid channel outlet of the second heat exchanger is connected to the gas turbine; the heat medium channel of the thermoelectric hybrid heater is connected to the main heat supply pipe, and the fluid channel outlet of the thermoelectric hybrid heater is merged to the heat medium pipeline between the second heat exchanger and the third heat exchanger.
In one or more embodiments of the present invention, a first filter and a second filter are respectively disposed around the pressure regulating branch.
In one or more embodiments of the present invention, a water pump is disposed at the outlet of the fluid passage of the thermoelectric hybrid heater.
In one or more embodiments of the present invention, the superheated steam heat storage device is further connected to a solar superheated steam generator.
In one or more embodiments of the present invention, the output port of the saturated steam heat storage device is connected to the lithium bromide refrigerator to provide a heat source for the lithium bromide refrigerator.
In one or more embodiments of the present invention, the lithium bromide refrigerator is further communicated with the main heat supply pipe to obtain a heat source.
In the middle of one or more embodiments of the utility model, this lithium bromide refrigerator is equipped with and communicates to the compressor and be used for providing the cold source pipeline of cold source for it, and this first heat exchanger has and communicates to the compressor for its heat source pipeline that provides the heat source, is equipped with the electronic valve group that is controlled by compressor inlet air temperature controlling means on this cold source pipeline and the heat source pipeline respectively.
In one or more embodiments of the present invention, the outlet of the superheated steam heat storage device is connected to the inlet of the cold section of the boiler reheater.
In one or more embodiments of the utility model, still be provided with the hydrophobic collector of boiler and fourth heat exchanger, the hydrophobic collector of this boiler is to this fourth heat exchanger output drainage in order to provide the heat source for the water, the water pipe connection between this fourth heat exchanger and the first heat exchanger to realize the secondary heating of water by fourth heat exchanger and first heat exchanger.
The beneficial effects of the utility model are that:
1) The steam of the superheated steam heat storage device can be used for ensuring the stability of a heat supply system after the combined cycle unit is stopped and improving the generating capacity of the unit, the steam and the solar energy which are wasted in the starting and stopping processes of the unit are effectively utilized, and the economical efficiency of the unit is improved.
2) The natural gas temperature in front of the filter of the natural gas pressure regulating station can be guaranteed to meet, the water outlet heat of the medium-pressure economizer of the front module heater can be effectively utilized, and the water bath furnace of the natural gas pressure regulating station and the front module starting electric heater can be eliminated.
3) The steam of the saturated steam heat storage device is used as the heat source of the lithium bromide refrigerator, the steam wasted in the starting and stopping processes of the unit is effectively utilized, and the economical efficiency of the unit is improved.
4) Waste heat boiler blow-down and water discharge are used for water heating, waste heat is effectively utilized, and unit economy is improved; the waste heat boiler blowdown is retrieved, the water is discharged, and the lithium bromide refrigerator uses the heat source working medium to the water treatment, reduces the working medium waste.
Drawings
Fig. 1 is a schematic diagram of the system framework of the present invention.
Detailed Description
The application is further described below with reference to the accompanying drawings:
referring to the attached figure 1, the peak-shaving heat supply and energy-saving system of the gas-steam combined cycle heat supply unit comprises: the system comprises a saturated steam heat storage device 1, an overheated steam heat storage device 2, a natural gas preheating system 3, a main heat supply pipe 4, a condenser 5, a lithium bromide refrigerator 6, a boiler drain collector 7 and a solar overheated steam generator 8; specifically, the input port of the saturated steam heat storage device 1 is connected with a low-pressure steam bypass of the unit, and the output port of the saturated steam heat storage device is respectively connected with a first heat exchanger 11 and a lithium bromide refrigerator 6; the boiler drainage collector 7 is used for connecting and collecting boiler continuous-row drainage and fixed-row drainage, and the output port of the boiler drainage collector is connected with a fourth heat exchanger 71; the saturated steam heat storage device 1 collects low-pressure bypass steam meeting steam parameters in the starting and stopping processes of the combined cycle unit, one path of the low-pressure bypass steam provides a heat source for the lithium bromide refrigerator 6, and the other path of the low-pressure bypass steam provides a heat source for a water body through the first heat exchanger 11; considering that the energy is fully utilized and the water body flow velocity is large, the requirement of heat exchange cannot be met by only one-time heating, so that the first heat exchanger 11 and the fourth heat exchanger 71 jointly provide a heat source for the water body, the second heating from the fourth heat exchanger 71 to the first heat exchanger 11 is realized, the hot steam and the drainage of a unit are fully utilized, and the heated water body can be used by the unit or provide domestic hot water for a park through a pipeline; the steam output by the saturated steam heat storage device 1 flows to the condenser 5 after passing through the first heat exchanger 11 to obtain condensed water for recycling; draining water generated by waste heat boiler blow-down and water discharging passes through a fourth heat exchanger 71 and then is sent to chemical water for recycling treatment;
the lithium bromide refrigerator 6 respectively obtains heat media from the saturated steam heat storage device 1 and the main heat supply pipe 4, and a heat source for the heat media is applied by the lithium bromide refrigerator 6 and then is sent to the chemical water for recycling treatment; the lithium bromide refrigerator 6 is provided with a cold source pipeline 61 communicated with the compressor to provide a cold source for the compressor, the first heat exchanger 11 is provided with a heat source pipeline 12 communicated with the compressor to provide a heat source for the compressor, which is equivalent to using water heated by the first heat exchanger 11 and the fourth heat exchanger 71 as a heat medium of the compressor, and the cold source pipeline 61 and the heat source pipeline 12 are respectively provided with an electronic valve set controlled by an air inlet temperature control device 9 of the compressor. The main heat supply pipe 4 is provided with a port for connecting and starting the boiler, a port for outputting auxiliary steam and a heat supply pipe network port for outputting a heat medium.
The input port of the superheated steam heat storage device 2 is connected with a high-medium pressure steam bypass of the unit, the output port of the superheated steam heat storage device is connected with the main heat supply pipe 4 and the inlet of the cold section of the boiler reheater, and the superheated steam heat storage device 2 is connected with the solar superheated steam generator 8; the superheated steam heat storage device 2 collects high-pressure and medium-pressure bypass steam meeting steam parameters in the start-stop process of the combined cycle unit and superheated steam of the solar superheated steam generator 8, one of the high-pressure and medium-pressure bypass steam outputs a heating medium to the main heat supply pipe 4, the other one of the high-pressure and medium-pressure bypass steam outputs a heating medium to the cold section inlet of the boiler reheater, and when the steam quantity is enough or the power grid needs to increase the output of the generator, steam is provided for the unit to increase the power generation;
the natural gas preheating system 3 comprises a second heat exchanger 31, a third heat exchanger 32, a thermoelectric hybrid heater 33 and a pressure regulating branch 34; a heat medium channel inlet 31a of the second heat exchanger 31 is connected to the medium pressure economizer outlet, a heat medium channel outlet 31b thereof is connected to a heat medium channel inlet 32a of the third heat exchanger 32, and a heat medium channel outlet 32b of the third heat exchanger 32 is connected to the condenser 5; the fluid passage inlet 32c of the third heat exchanger 32 is connected with a natural gas source, the fluid passage outlet 32d thereof is connected with the fluid passage inlet 31c of the second heat exchanger 31 through the pressure regulating branch 34, and the fluid passage outlet 31d of the second heat exchanger 31 is connected with the gas turbine; a first filter 35 and a second filter 36 are respectively arranged in front of and behind the pressure regulating branch 34; the heat medium channel inlet 33a of the thermo-electric hybrid heater 33 is connected to the main heating pipe 4, the flow channel inlet 33c thereof is connected to take out the condensed water, and the flow channel outlet 33d thereof is merged to the heat medium pipe between the second heat exchanger 31 and the third heat exchanger 32.
When the unit is not operated or is in a starting stage, no heating medium is supplied to the outlet of the medium-pressure economizer, at the moment, the condensed water is heated by the thermoelectric mixed heater 33, then the natural gas is preheated by the third heat exchanger 31, so that the temperature of the natural gas before entering the first filter 35 meets the requirement, and if the heat supply of the main heat supply pipe 4 is insufficient, the condensed water can be heated by the electric heating function of the thermoelectric mixed heater 33 per se; after the unit operates stably, the medium-pressure economizer outlet can directly supply heating media to the second heat exchanger 31 and the third heat exchanger 32, and the thermoelectric hybrid heater 33 can be closed; in the embodiment, the two-stage cascade prepositive heat exchangers (namely the second heat exchanger 31 and the third heat exchanger 32) are effectively utilized to preheat the natural gas, the temperature requirement on the natural gas is met, the water bath furnace and the prepositive module starting electric heater in the natural gas pressure regulating station in the traditional scheme are omitted, and the energy conservation and emission reduction are realized.
The electronic valve sets are controlled by an upper controller and used for controlling the opening and closing or/and the flow direction of the pipeline, and the electronic valve sets comprise combinations of electromagnetic valves, check valves, lifting check valves and the like, so that the system controller can conveniently open/close the pipeline as required, or cut off the pipeline in time when an alarm occurs. For example, by using an electronic valve group for controlling the bromine lithium bromide refrigerator 6, the saturated steam heat storage device 1 and the main heat supply pipe 4, a heat supply source can be selected according to actual conditions; by utilizing an electronic valve bank between the superheated steam heat storage device 2 and the main heat supply pipe 4 and between the superheated steam heat storage device and the inlet of the cold section of the boiler reheater, heat can be supplied to the cold section of the boiler reheater, or heat can be supplied to the main heat supply pipe 4 and the boiler reheater simultaneously; the heat supply from the solar superheated steam generator 8 can be selectively started and switched on through an electronic valve bank between the solar superheated steam generator 8 and the superheated steam heat storage device 2; the connection or disconnection of the heat medium pipe between the second heat exchanger 31 and the third heat exchanger 32 can be achieved by the electronic valve block at the fluid passage outlet 33d of the thermo-electric hybrid heater 33; the connection or disconnection of the heat supply of the outlet of the medium-pressure economizer can be realized by using the electronic valve group at the heat medium channel inlet 31a and the heat medium channel outlet 31b of the second heat exchanger 31; and the electronic valve sets are switched or/and controlled in flow direction according to actual operation requirements.
The above preferred embodiments should be considered as examples of the embodiments of the present application, and technical deductions, substitutions, improvements and the like similar to, similar to or based on the embodiments of the present application should be considered as the protection scope of the present patent.
Claims (9)
1. The utility model provides a peak regulation heat supply and economizer system of gas steam combined cycle heat supply unit which characterized in that includes:
the input port of the saturated steam heat storage device is connected with a low-pressure steam bypass of the unit, and the output port of the saturated steam heat storage device is connected with a first heat exchanger which is used for providing a heat source for a water body;
the input port of the superheated steam heat storage device is connected with a high-medium pressure steam bypass of the unit, and the output port of the superheated steam heat storage device is connected with a main heat supply pipe of the unit;
the natural gas preheating system comprises a second heat exchanger, a third heat exchanger, a thermoelectric mixed heater and a pressure regulating branch; a heat medium channel inlet of the second heat exchanger is connected with an outlet of the medium-pressure economizer, and a heat medium channel outlet of the second heat exchanger is connected with a heat medium channel inlet of the third heat exchanger; the fluid channel inlet of the third heat exchanger is connected with a natural gas source, the fluid channel outlet of the third heat exchanger is connected to the fluid channel inlet of the second heat exchanger through a pressure regulating branch, and the fluid channel outlet of the second heat exchanger is connected to the gas turbine; the heat medium channel of the thermoelectric hybrid heater is connected to the main heat supply pipe, and the outlet of the fluid channel of the thermoelectric hybrid heater is merged to the heat medium pipeline between the second heat exchanger and the third heat exchanger.
2. The peak-load heating and energy-saving system of the gas-steam combined cycle heating unit as claimed in claim 1, wherein a first filter and a second filter are respectively disposed before and after the pressure regulating branch.
3. The peak load heating and energy saving system of the gas and steam combined cycle heat supply unit according to claim 1, wherein a water pump is arranged at the outlet of the fluid passage of the thermoelectric hybrid heater.
4. The peak-shaving heating and energy-saving system of the gas-steam combined cycle heating unit according to claim 1, wherein the superheated steam heat storage device is further connected with a solar superheated steam generator.
5. The peak-shaving heat supply and energy saving system of the gas-steam combined cycle heat supply unit according to claim 1, wherein an output port of the saturated steam heat storage device is connected with a lithium bromide refrigerator to provide a heat source for the saturated steam heat storage device.
6. The peak shaving heat supply and energy saving system of the gas and steam combined cycle heat supply unit of claim 5, wherein the lithium bromide refrigerator is further communicated with the primary heat supply pipe to obtain a heat source.
7. The peak-load regulation heat supply and energy saving system of the gas and steam combined cycle heat supply unit as claimed in claim 5, wherein the lithium bromide refrigerator is provided with a cold source pipeline communicated with the compressor for providing a cold source for the compressor, the first heat exchanger is provided with a heat source pipeline communicated with the compressor for providing a heat source for the compressor, and the cold source pipeline and the heat source pipeline are respectively provided with an electronic valve bank controlled by an inlet air temperature control device of the compressor.
8. The peak shaving heat supply and energy saving system of a gas and steam combined cycle heat supply unit according to claim 1, wherein the outlet of the superheated steam heat storage device is connected with the inlet of the cold section of the boiler reheater.
9. The peak-shaving heat supply and energy saving system of the gas-steam combined cycle heat supply unit according to any one of claims 1 to 8, wherein a boiler drain collector and a fourth heat exchanger are further arranged, the boiler drain collector outputs drain water to the fourth heat exchanger to provide a heat source for a water body, and the fourth heat exchanger is connected with a water body pipeline between the first heat exchanger, so that secondary heating of the water body is realized by the fourth heat exchanger and the first heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122701728.5U CN217653946U (en) | 2021-11-06 | 2021-11-06 | Peak-shaving heat supply and energy-saving system of gas-steam combined cycle heat supply unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122701728.5U CN217653946U (en) | 2021-11-06 | 2021-11-06 | Peak-shaving heat supply and energy-saving system of gas-steam combined cycle heat supply unit |
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| Publication Number | Publication Date |
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| CN217653946U true CN217653946U (en) | 2022-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122701728.5U Active CN217653946U (en) | 2021-11-06 | 2021-11-06 | Peak-shaving heat supply and energy-saving system of gas-steam combined cycle heat supply unit |
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| CN (1) | CN217653946U (en) |
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- 2021-11-06 CN CN202122701728.5U patent/CN217653946U/en active Active
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