CN214745672U - Multistage waste heat comprehensive utilization device of power plant - Google Patents
Multistage waste heat comprehensive utilization device of power plant Download PDFInfo
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- CN214745672U CN214745672U CN202120594162.8U CN202120594162U CN214745672U CN 214745672 U CN214745672 U CN 214745672U CN 202120594162 U CN202120594162 U CN 202120594162U CN 214745672 U CN214745672 U CN 214745672U
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Abstract
The utility model discloses a multistage waste heat comprehensive utilization device of power plant, including condensate line, the condenser, absorption heat pump absorber, absorption heat pump condenser, unit low pressure heater water side pipeline, lubricating oil supply pipe way, lubricating oil supply three-way valve, the lubricating oil cooler, absorption heat pump evaporimeter, the oxygen-eliminating device, oxygen-eliminating device exhaust three-way valve, oxygen-eliminating device evacuation pipeline, absorption heat pump generator, expansion valve and solution heat exchanger, the device realizes the recycle of oxygen-eliminating device exhaust and lubricating oil return waste heat, improves the condensate temperature simultaneously, eliminates the white smoke plume problem of oxygen-eliminating device exhaust.
Description
Technical Field
The utility model belongs to the technical field of waste heat recovery utilizes and energy-concerving and environment-protective of power plant, a multistage waste heat comprehensive utilization device of power plant is related to.
Background
The power plant is used as a primary energy consumer, the generating efficiency of the traditional large-scale unit is less than 50%, and the comprehensive utilization rate of energy under the heat supply working condition is still less than 60%. Among the lost energy, the energy carried away by the low-temperature circulating water or air accounts for more than 30% of the total energy consumption. The waste heat utilization is related to the important problems of energy conservation and emission reduction, comprehensive utilization of resources, ecological environment protection and the like of a power plant. At present, the research on the utilization of the waste heat of the power plant mainly focuses on high-temperature flue gas easy to recover and circulating water with high low-grade heat storage capacity, and the research on other working media with recovery values is less.
In the operation process of the steam turbine generator set, heat conducted to the bearing by steam and heat generated by rotation of the bearing need to be taken away through a lubricating oil system, lubricating oil enters the bearing bush for heat exchange at the temperature of about 40 ℃, and the oil return temperature can reach over 60 ℃. The flow of a lubricating oil system of a large-scale unit reaches 200m3Above/h, this heat is transferred to the cooling water system through the heat exchanger, causing heat loss.
The deaerator of the power plant has the function of spraying steam into water through the bubbling pipe and heating feed water to remove oxygen in the water. A part of steam and non-condensable gas mixed with oxygen are discharged into the atmosphere through a steam discharge pipe, the steam discharge amount of a large-scale unit deaerator during operation can reach 180-300 kg/h, the temperature reaches 180 ℃, a large amount of water steam and contained heat are wasted, and obvious white smoke plume is formed to cause visual pollution.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a multistage waste heat comprehensive utilization device of power plant, this dress can eliminate the white plume problem of oxygen-eliminating device steam extraction, reduces the lubricating oil temperature simultaneously, improves the condensation temperature, realizes thermal recovery.
In order to achieve the purpose, the multistage waste heat comprehensive utilization device of the power plant comprises a condensation water pipeline of an induced draft fan, a condenser, an absorption heat pump absorber, a condenser of the absorption heat pump, a water side pipeline of a unit low-pressure heater, a lubricating oil supply pipeline, a lubricating oil supply three-way valve, a lubricating oil cooler, an absorption heat pump evaporator, a deaerator exhaust three-way valve, a deaerator exhaust pipeline, an absorption heat pump generator, an expansion valve and a solution heat exchanger;
the outlet of the condensed water pipeline of the induced draft fan is divided into two paths, wherein one path is communicated with the condenser, and the other path is communicated with the water side pipeline of the low-pressure heater of the unit through the heat absorption side of the absorption heat pump absorber and the heat absorption side of the absorption heat pump condenser in sequence;
the lubricating oil supply pipeline is communicated with a first opening of the lubricating oil supply three-way valve, a second opening of the lubricating oil supply three-way valve is communicated with an inlet of the lubricating oil cooler, a third opening of the lubricating oil supply three-way valve is communicated with the lubricating oil cooler through the heat release side of the absorption heat pump evaporator, and an outlet of the lubricating oil cooler is communicated with an external steam turbine oil inlet pipeline;
the outlet of the deaerator is communicated with the first opening of the deaerator steam exhaust three-way valve, the second opening of the deaerator steam exhaust three-way valve is communicated with the deaerator emptying pipeline, and the third opening of the deaerator steam exhaust three-way valve is communicated with the deaerator emptying pipeline through the heat release side of the absorption heat pump generator;
the working medium outlet of the absorption heat pump generator is communicated with the working medium side of the absorption heat pump evaporator through the working medium side of the absorption heat pump condenser and the expansion valve, and the working medium outlet of the absorption heat pump evaporator is communicated with the working medium inlet of the absorption heat pump absorber;
the solution outlet of the absorption heat pump generator is communicated with the solution inlet of the absorption heat pump absorber through the heat release side of the solution heat exchanger, and the solution outlet of the absorption heat pump absorber is communicated with the solution inlet of the absorption heat pump generator through the heat absorption side of the solution heat exchanger.
The outlet of the condensed water pipeline of the induced draft fan is communicated with the condenser through a bypass stop valve.
The outlet of the condensed water pipeline of the induced draft fan is communicated with the heat absorption side of the absorption heat pump absorber through an inlet stop valve.
The heat absorption side of the absorption heat pump condenser is communicated with a water side pipeline of the low-pressure heater of the unit through an outlet stop valve.
The heat release side of the absorption heat pump evaporator is communicated with the lubricating oil cooler through a lubricating oil supply stop valve.
The heat release side of the absorption heat pump generator is communicated with a deaerator emptying pipeline through a deaerator steam exhaust stop valve.
The solution outlet of the absorption heat pump absorber is communicated with the heat absorption side of the solution heat exchanger through a solution pump.
The heat release side of the solution heat exchanger is communicated with the solution inlet of the absorption heat pump absorber through a pressure reducing valve.
The utility model discloses following beneficial effect has:
multistage waste heat comprehensive utilization device of power plant when concrete operation, adopt oxygen-eliminating device steam extraction drive absorption heat pump, retrieve the high temperature oil return heat of lubricating oil system, the heat that will obtain is sent to in absorption heat pump absorber and the condenser, heat the draught fan condensate water, realize the recycle of oxygen-eliminating device steam extraction and lubricating oil return waste heat, reduce the lubricating oil temperature simultaneously, reduce cooling water system's the volume of using, the power consumption of saving factory, in addition, the steam extraction release heat cooling of oxygen-eliminating device is condensed, in order to eliminate white plume, moreover, the steam generator is simple in structure, high durability and high reliability.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a condenser, 2 is a deaerator, 3 is an absorption heat pump generator, 4 is an absorption heat pump condenser, 5 is an absorption heat pump evaporator, 6 is an absorption heat pump absorber, 7 is a solution heat exchanger, 8 is a lubricating oil cooler, 9 is a draught fan condensed water bypass stop valve, 10 is an inlet stop valve, 11 is an outlet stop valve, 12 is a lubricating oil supply three-way valve, 13 is a lubricating oil supply stop valve, 14 is a deaerator exhaust three-way valve, 15 is a deaerator exhaust stop valve, 16 is an expansion valve, 17 is a pressure reducing valve, and 18 is a solution pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the multistage waste heat comprehensive utilization device of the power plant of the present invention includes a condensed water pipeline of the induced draft fan, a condenser 1, an absorption heat pump absorber 6, an absorption heat pump condenser 4, a water side pipeline of the unit low-pressure heater, a lubricating oil supply pipeline, a lubricating oil supply three-way valve 12, a lubricating oil cooler 8, an absorption heat pump evaporator 5, a deaerator 2, a deaerator exhaust three-way valve 14, a deaerator exhaust pipeline, an absorption heat pump generator 3, an expansion valve 16 and a solution heat exchanger 7; the outlet of the condensed water pipeline of the induced draft fan is divided into two paths, wherein one path is communicated with the condenser 1, and the other path is communicated with the water side pipeline of the low-pressure heater of the unit through the heat absorption side of the absorption heat pump absorber 6 and the heat absorption side of the absorption heat pump condenser 4 in sequence; the lubricating oil supply pipeline is communicated with a first opening of a lubricating oil supply three-way valve 12, a second opening of the lubricating oil supply three-way valve 12 is communicated with an inlet of a lubricating oil cooler 8, a third opening of the lubricating oil supply three-way valve 12 is communicated with the lubricating oil cooler 8 through the heat release side of the absorption heat pump evaporator 5, and an outlet of the lubricating oil cooler 8 is communicated with an external steam turbine oil inlet pipeline; the outlet of the deaerator 2 is communicated with the first opening of the deaerator exhaust three-way valve 14, the second opening of the deaerator exhaust three-way valve 14 is communicated with the deaerator exhaust pipeline, and the third opening of the deaerator exhaust three-way valve 14 is communicated with the deaerator exhaust pipeline through the heat release side of the absorption heat pump generator 3; a working medium outlet of the absorption heat pump generator 3 is communicated with a working medium side of the absorption heat pump evaporator 5 through a working medium side of the absorption heat pump condenser 4 and the expansion valve 16, and the working medium outlet of the absorption heat pump evaporator 5 is communicated with a working medium inlet of the absorption heat pump absorber 6; the solution outlet of the absorption heat pump generator 3 is communicated with the solution inlet of the absorption heat pump absorber 6 through the heat release side of the solution heat exchanger 7, and the solution outlet of the absorption heat pump absorber 6 is communicated with the solution inlet of the absorption heat pump generator 3 through the heat absorption side of the solution heat exchanger 7.
Specifically, the outlet of the condensed water pipeline of the induced draft fan is communicated with the condenser 1 through a condensed water bypass stop valve 9 of the induced draft fan; the outlet of the condensed water pipeline is communicated with the heat absorption side of the absorption heat pump absorber 6 through an inlet stop valve 10; the heat absorption side of the absorption heat pump condenser 4 is communicated with a water side pipeline of the unit low-pressure heater through an outlet stop valve 11; the heat release side of the absorption heat pump evaporator 5 is communicated with a lubricating oil cooler 8 through a lubricating oil supply stop valve 13; the heat release side of the absorption heat pump generator 3 is communicated with a deaerator emptying pipeline through a deaerator steam exhaust stop valve 15; the solution outlet of the absorption heat pump absorber 6 is communicated with the heat absorption side of the solution heat exchanger 7 through a solution pump 18; the heat release side of the solution heat exchanger 7 is communicated with the solution inlet of the absorption heat pump absorber 6 through a pressure reducing valve 17.
The utility model discloses a concrete working process does:
the steam output by the deaerator 2 enters the absorption heat pump generator 3 to release heat and reduce temperature after passing through a deaerator steam exhaust three-way valve 14, and then is exhausted from an emptying pipeline to eliminate white smoke plume;
condensed water output by a condensed water pipeline of the induced draft fan is heated by an absorption heat pump absorber 6 and an absorption heat pump condenser 4 in sequence and then enters a water side pipeline of a low-pressure heater of the unit through an outlet stop valve 11;
the lubricating oil output by the lubricating oil supply pipeline enters the absorption heat pump evaporator 5 for cooling after passing through the lubricating oil supply three-way valve 12, and then passes through the lubricating oil supply stop valve 13 and the lubricating oil cooler 8 to be led to a lubricating oil system of the unit.
In addition, during operation, the temperature of the lubricating oil at the outlet of the lubricating oil cooler 8 can be adjusted supplementarily by adjusting the parameters of the lubricating oil cooler 8.
When the system needs to be shut down, the deaerator 2 is shut down to exhaust steam, lubricating oil and condensed water of the induced draft fan in sequence, specifically, a third opening of a deaerator steam exhaust three-way valve 14 is closed, a second opening of the deaerator steam exhaust three-way valve 14 is opened at the same time, a deaerator steam exhaust stop valve 15 is closed, then a condensed water bypass stop valve 9 of the induced draft fan is opened, and an inlet stop valve 10 is closed; the second opening of the three-way valve 12 for lubricating oil supply is opened, the third opening of the three-way valve 12 for lubricating oil supply is closed at the same time, and finally the stop valve 13 for lubricating oil supply is closed.
After the device trips because of the fault, the third opening of the deaerator steam exhaust three-way valve 14 is closed earlier, the second opening of the deaerator steam exhaust three-way valve 14 is opened simultaneously, the deaerator steam exhaust stop valve 15 is closed, the draught fan condensate bypass stop valve 9 is opened, the inlet stop valve 10 is closed, and the parameter of the lubricating oil cooler 8 is adjusted, so that the lubricating oil temperature at the outlet of the lubricating oil cooler 8 is kept stable.
What need explain at last, the utility model discloses both can be used to newly-built unit, also can be used to current unit transformation, through changing 14 apertures of deaerator steam extraction three-way valve or supplementary adjustment lubricating oil cooler 8, all can be stable, the safe operation when unit normal operating or operating mode change.
Claims (8)
1. The multi-stage waste heat comprehensive utilization device of the power plant is characterized by comprising a condensation water pipeline of an induced draft fan, a condenser (1), an absorption heat pump absorber (6), an absorption heat pump condenser (4), a water side pipeline of a unit low-pressure heater, a lubricating oil supply pipeline, a lubricating oil supply three-way valve (12), a lubricating oil cooler (8), an absorption heat pump evaporator (5), a deaerator (2), a deaerator exhaust three-way valve (14), a deaerator exhaust pipeline, an absorption heat pump generator (3), an expansion valve (16) and a solution heat exchanger (7);
the outlet of the condensed water pipeline of the induced draft fan is divided into two paths, wherein one path is communicated with the condenser (1), and the other path is communicated with the water side pipeline of the low-pressure heater of the unit through the heat absorption side of the absorption heat pump absorber (6) and the heat absorption side of the absorption heat pump condenser (4) in sequence;
the lubricating oil supply pipeline is communicated with a first opening of a lubricating oil supply three-way valve (12), a second opening of the lubricating oil supply three-way valve (12) is communicated with an inlet of a lubricating oil cooler (8), a third opening of the lubricating oil supply three-way valve (12) is communicated with the lubricating oil cooler (8) through the heat release side of an absorption heat pump evaporator (5), and an outlet of the lubricating oil cooler (8) is communicated with an external steam turbine oil inlet pipeline;
the steam outlet of the deaerator (2) is communicated with the first opening of a deaerator steam exhaust three-way valve (14), the second opening of the deaerator steam exhaust three-way valve (14) is communicated with a deaerator emptying pipeline, and the third opening of the deaerator steam exhaust three-way valve (14) is communicated with the deaerator emptying pipeline through the heat release side of the absorption heat pump generator (3);
a working medium outlet of the absorption heat pump generator (3) is communicated with a working medium side of the absorption heat pump evaporator (5) through a working medium side of the absorption heat pump condenser (4) and the expansion valve (16), and the working medium outlet of the absorption heat pump evaporator (5) is communicated with a working medium inlet of the absorption heat pump absorber (6);
the solution outlet of the absorption heat pump generator (3) is communicated with the solution inlet of the absorption heat pump absorber (6) through the heat release side of the solution heat exchanger (7), and the solution outlet of the absorption heat pump absorber (6) is communicated with the solution inlet of the absorption heat pump generator (3) through the heat absorption side of the solution heat exchanger (7).
2. A power plant multi-stage waste heat comprehensive utilization device according to claim 1, characterized in that an outlet of a condensed water pipeline of the induced draft fan is communicated with the condenser (1) through a bypass stop valve (9).
3. A power plant multi-stage waste heat comprehensive utilization device according to claim 1, characterized in that an outlet of a condensation water pipeline of the induced draft fan is communicated with a heat absorption side of the absorption heat pump absorber (6) through an inlet stop valve (10).
4. A power plant multi-stage waste heat comprehensive utilization device according to claim 1, characterized in that the heat absorption side of the absorption heat pump condenser (4) is communicated with the water side pipeline of the unit low pressure heater through an outlet stop valve (11).
5. A power plant multi-stage waste heat comprehensive utilization device according to claim 1, characterized in that the heat release side of the absorption heat pump evaporator (5) is communicated with the lubricating oil cooler (8) through a lubricating oil supply stop valve (13).
6. A power plant multi-stage waste heat comprehensive utilization device according to claim 1, characterized in that the heat release side of the absorption heat pump generator (3) is communicated with the deaerator emptying pipeline through a deaerator steam exhaust stop valve (15).
7. A power plant multi-stage waste heat comprehensive utilization device according to claim 1, characterized in that a solution outlet of the absorption heat pump absorber (6) is communicated with a heat absorption side of the solution heat exchanger (7) through a solution pump (18).
8. A power plant multi-stage waste heat comprehensive utilization device according to claim 1, characterized in that the heat release side of the solution heat exchanger (7) is communicated with the solution inlet of the absorption heat pump absorber (6) through a pressure reducing valve (17).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120594162.8U CN214745672U (en) | 2021-03-23 | 2021-03-23 | Multistage waste heat comprehensive utilization device of power plant |
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| CN202120594162.8U CN214745672U (en) | 2021-03-23 | 2021-03-23 | Multistage waste heat comprehensive utilization device of power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022198922A1 (en) * | 2021-03-23 | 2022-09-29 | 西安热工研究院有限公司 | Power plant multi-stage waste heat comprehensive utilizing apparatus and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022198922A1 (en) * | 2021-03-23 | 2022-09-29 | 西安热工研究院有限公司 | Power plant multi-stage waste heat comprehensive utilizing apparatus and method |
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