CN212657690U - Energy-saving system utilizing energy of thermal power generating unit in starting stage - Google Patents
Energy-saving system utilizing energy of thermal power generating unit in starting stage Download PDFInfo
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- CN212657690U CN212657690U CN202021218538.7U CN202021218538U CN212657690U CN 212657690 U CN212657690 U CN 212657690U CN 202021218538 U CN202021218538 U CN 202021218538U CN 212657690 U CN212657690 U CN 212657690U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000003303 reheating Methods 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000009833 condensation Methods 0.000 claims abstract description 4
- 230000005494 condensation Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 abstract description 11
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
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Abstract
The utility model relates to an energy-saving system utilizing energy of a thermal power generating unit in a starting stage, which comprises a deaerator, a water feeding pump, a high-pressure heater group, a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, a condenser, a condensate pump and a low-pressure heater group; the outlet of the deaerator is connected with a water feed pump; one path of a reheat steam pipeline of the boiler is led to an inlet of the intermediate pressure cylinder, the other path is led to a deaerator, and the other path is led to a condenser; the condensation pump is connected with the low-pressure heater group, and the low-pressure heater group is connected with the deaerator; and a branch of the reheating steam pipeline introduced into the deaerator is provided with a stop valve, a regulating valve and a check valve, and the reheating steam pipeline is used for introducing all or part of reheating steam into the deaerator and heating condensed water of the deaerator. The utility model discloses can recycle the energy that produces in the unit start-up process, especially the unit of two systems operation, reach thermal power generating unit energy saving and emission reduction's purpose, improve the economic nature of unit.
Description
Technical Field
The utility model belongs to the technical field of thermal power, especially, relate to an utilize economizer system of thermal power unit start-up stage energy.
Background
In the future, energy development in China will take new energy as a theme, and fossil energy exists by effective supplement of the new energy. Under the great trend of the energy revolution, the deep exploration of the energy-saving potential of the thermal power generating unit is a topic with great significance.
At present, each large power grid in China still mainly comprises a thermal power generating unit, and the thermal power generating unit is bound to bear the important role of peak regulation in a long period of time in the future. The two-shift operation mode is one of the means for solving the peak regulation problem of the thermal power generating unit. However, the research on the two-shift operation of the thermal power generating unit is not sufficient enough.
Tests and applications of two-shift peak shaving operation modes have been practiced on 100MW units, 125MW units and 200MW units in China.
At present, an energy-saving method for a thermal power generating unit at a starting stage is still incomplete, and particularly a unit operated by two shifts inevitably faces a frequent starting problem, which is inevitable due to an operation mode of the unit. A large amount of energy loss exists in the starting and stopping process of the unit, particularly the unit which runs in two shifts. The energy-saving problem of the starting process of the two-shift running unit is very important to be researched. If, can effectively utilize the unit at the start-up stage energy, can certainly improve the holistic economic nature of unit.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an utilize economizer system of thermal power unit start-up stage energy effectively utilizes the heat of reheat steam in the steam turbine starting process to reach coal-fired thermal power unit energy saving and emission reduction, improve the purpose of its economic nature.
The utility model provides an energy-saving system utilizing energy of a thermal power generating unit in a starting stage, which comprises a deaerator, a feed pump, a high-pressure heater group, a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, a condenser, a condensate pump and a low-pressure heater group;
the outlet of the deaerator is connected with the feed pump, the outlet of the feed pump is connected with the high-pressure heater group, and the high-pressure heater group is connected with the boiler; one path of a main steam pipeline of the boiler is led to the inlet of the high-pressure cylinder, and the other path of the main steam pipeline is directly connected with a steam exhaust pipeline of the high-pressure cylinder;
one path of a reheat steam pipeline of the boiler is led to an inlet of the intermediate pressure cylinder, the other path of the reheat steam pipeline is led to the deaerator, and the other path of the reheat steam pipeline is led to the condenser; the exhaust steam of the intermediate pressure cylinder is led to the low pressure cylinder, and the exhaust steam of the low pressure cylinder is led to the condenser; the outlet of the condenser is connected with the condensate pump; a condensed water bypass system is arranged in front of the low-pressure heater group; the condensation pump is connected with the low-pressure heater group, and the low-pressure heater group is connected with the deaerator;
and a branch of the reheating steam pipeline introduced into the deaerator is provided with a stop valve, a regulating valve and a check valve, and the reheating steam pipeline is used for introducing all or part of reheating steam into the deaerator and heating condensed water of the deaerator.
By means of the scheme, the energy-saving system for energy in the starting stage of the thermal power generating unit is utilized to recycle the energy generated in the starting process of the thermal power generating unit, particularly the unit running in two shifts, so that the purposes of energy conservation and emission reduction of the thermal power generating unit are achieved, the economy of the unit is improved, and the following technical effects are achieved:
1) in the starting process of the thermal power generating unit, reheated steam is not required to be completely introduced into the condenser, but is partially or completely introduced into the deaerator and used for heating condensed water in the deaerator, and compared with a traditional mode, the starting mode is more flexible.
2) The time for raising temperature and boosting pressure of the boiler is shortened compared with the original system, and the workload of operators is reduced.
3) The safety and the flexibility of the unit are improved.
4) The thermodynamic system is simple to transform and high in feasibility.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made of preferred embodiments of the present invention.
Drawings
Fig. 1 is the utility model discloses utilize the economizer system's of thermal power unit start-up stage energy schematic diagram.
Reference numbers in the figures:
1-a deaerator; 2-a feed pump; 3-high pressure heater group; 4-a boiler; 5-high pressure cylinder; 6-intermediate pressure cylinder; 7-low pressure cylinder; 8-a generator; 9-a condenser; 10-a condensate pump; 11-low pressure heater group; 12-a stop valve; 13-a regulating valve; 14-check valve.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Referring to fig. 1, the embodiment provides an energy saving system using energy at a starting stage of a thermal power generating unit, and the energy saving system includes a deaerator 1, a water pump 2, a high-pressure heater group 3, a boiler 4, a high-pressure cylinder 5, an intermediate-pressure cylinder 6, a low-pressure cylinder 7, a generator 8, a condenser 9, a condensate pump 10, a low-pressure heater group 11, a stop valve 12, a regulating valve 13, and a check valve 14. The outlet of the deaerator 1 is connected with a water feeding pump 2. The outlet of the feed pump 2 is connected with a high-pressure heater group 3, and the high-pressure heater group 3 is connected with a boiler 4. One path of a main steam pipeline of the boiler 4 is led to an inlet of the high-pressure cylinder 5, and the other path of the main steam pipeline is directly connected with a steam exhaust pipeline of the high-pressure cylinder 5. One path of the reheating steam pipeline is led to an inlet of the intermediate pressure cylinder 6, the other path is led to the deaerator 1, and the other path is led to the condenser 9. The exhaust steam of the intermediate pressure cylinder 6 is led to the low pressure cylinder 7, and the exhaust steam of the low pressure cylinder 7 is led to the condenser 9. The outlet of the condenser 9 is connected to a condensate pump 10. A condensed water bypass system is arranged in front of the low-pressure heater group 11. The condensation pump 10 is connected with a low-pressure heater group 11, and the low-pressure heater group 11 is connected with the deaerator 1. The water supply of the deaerator 1 is taken from chemical desalted water. The branch of the low-pressure bypass into the deaerator 1 is provided with a stop valve 12, a regulating valve 13 and a check valve 14.
When the unit is started, the feed water pump 2 sends feed water to the boiler 4 to generate high-temperature and high-pressure steam. The high-temperature and high-pressure steam does not enter the steam turbine, but passes through the high-pressure bypass, is subjected to temperature reduction and pressure reduction through water spraying, is introduced into the cold re-pipeline, and is sent to the boiler 4 again to absorb heat to form reheated steam. The reheated steam passes through the low-pressure bypass, is subjected to temperature reduction and pressure reduction and then is introduced into the condenser 9 to form condensed water. Therefore, the pressure and the temperature of the main steam and the reheated steam reach the parameters of the turbine running through repeated circulation. In this process, the primary steam may be used for the auxiliary steam headers of the unit. The heat of the reheated steam cannot be effectively utilized, and the conventional coal-fired unit has the defects of less starting and stopping times and unobvious problem. However, the loss caused by the frequent start and stop of the unit running in two shifts is very obvious. In this embodiment, after the boiler is ignited, before the turbine is turned on and connected to the grid, the main steam is returned to the boiler through the high-pressure bypass after being subjected to temperature and pressure reduction. The reheated steam can be fully or partially introduced into the deaerator to be used for heating condensed water of the deaerator (the residual reheated steam is introduced into the condenser to recover working medium). The utility model discloses recycle the energy of reheat steam in the thermal power unit start-up process to reach unit energy saving and emission reduction, improved the purpose of two unit economic nature.
The operation mode of the energy-saving system utilizing the energy of the thermal power generating unit in the starting stage is as follows:
the starting process of the thermal power generating unit is realized through a high bypass and a low bypass. After the boiler 4 is ignited, the temperature and pressure of the main steam and the reheat steam cannot necessarily reach the requirement of the impulse turbine immediately. The temperature and pressure of the main steam and the reheat steam are increased by the boiler combustion, which requires one hour less and three or four hours more. The main steam generated by the boiler 4 passes through a high-pressure bypass and is directly returned to the boiler after being sprayed with water, the temperature is reduced and the pressure is reduced. The reheated steam can be partially or completely introduced into the deaerator 1 after passing through the regulating valve 13 and the check valve 14. In the deaerator 1, the reheated steam exchanges heat with the deaerator 1 water supplement and condensed water to form corresponding saturated water under the pressure. The feed water is delivered to the boiler through the feed water pump 2, and high-temperature and high-pressure main steam is formed again to complete a complete cycle.
Compare with the condenser of introducing after traditional desuperheating steam decompression, the utility model discloses there is apparent advantage. In specific implementation, the flow rate of the reheat steam introduced into the deaerator can be determined according to the actual condition of the deaerator 1. The average temperature of the reheated steam is about 300 ℃ and the average pressure of the reheated steam is about 0.4MPa during the starting process of the unit, and the temperature of the inlet of the condensing pump is assumed to be 52 ℃ and the pressure is assumed to be 14 kpa. Then a savings of about 70 ten thousand dollars per year may be initially calculated.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (1)
1. An energy-saving system utilizing energy of a thermal power generating unit in a starting stage is characterized by comprising a deaerator (1), a water feeding pump (2), a high-pressure heater group (3), a boiler (4), a high-pressure cylinder (5), a medium-pressure cylinder (6), a low-pressure cylinder (7), a generator (8), a condenser (9), a condensate pump (10) and a low-pressure heater group (11);
the outlet of the deaerator (1) is connected with the water feed pump (2), the outlet of the water feed pump (2) is connected with the high-pressure heater group (3), and the high-pressure heater group (3) is connected with the boiler (4); one path of a main steam pipeline of the boiler (4) is led to an inlet of the high-pressure cylinder (5), and the other path of the main steam pipeline is directly connected with a steam exhaust pipeline of the high-pressure cylinder (5);
one path of a reheating steam pipeline of the boiler (4) is led to an inlet of the intermediate pressure cylinder (6), and the other path of the reheating steam pipeline is led to the deaerator (1) and the other path of the reheating steam pipeline is led to the condenser (9); the exhaust steam of the intermediate pressure cylinder (6) is led to the low pressure cylinder (7), and the exhaust steam of the low pressure cylinder (7) is led to the condenser (9); the outlet of the condenser (9) is connected with the condensate pump (10); a condensed water bypass system is arranged in front of the low-pressure heater group (11); the condensation pump (10) is connected with the low-pressure heater group (11), and the low-pressure heater group (11) is connected with the deaerator (1);
a branch of the reheating steam pipeline introduced into the deaerator (1) is provided with a stop valve (12), a regulating valve (13) and a check valve (14) for introducing all or part of reheating steam into the deaerator (1) and heating condensed water of the deaerator (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021218538.7U CN212657690U (en) | 2020-06-28 | 2020-06-28 | Energy-saving system utilizing energy of thermal power generating unit in starting stage |
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| CN202021218538.7U CN212657690U (en) | 2020-06-28 | 2020-06-28 | Energy-saving system utilizing energy of thermal power generating unit in starting stage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111853754A (en) * | 2020-06-28 | 2020-10-30 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Energy-saving system and method utilizing energy of thermal power generating unit in starting stage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111853754A (en) * | 2020-06-28 | 2020-10-30 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Energy-saving system and method utilizing energy of thermal power generating unit in starting stage |
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