CN217464397U - Thermoelectric decoupling system based on boiler superheated steam reposition of redundant personnel - Google Patents
Thermoelectric decoupling system based on boiler superheated steam reposition of redundant personnel Download PDFInfo
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- CN217464397U CN217464397U CN202220952995.1U CN202220952995U CN217464397U CN 217464397 U CN217464397 U CN 217464397U CN 202220952995 U CN202220952995 U CN 202220952995U CN 217464397 U CN217464397 U CN 217464397U
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Abstract
The utility model provides a thermoelectric decoupling zero system based on boiler superheated steam shunts relates to the boiler field, including water-cooling wall, one-level over heater, second grade over heater and the tertiary over heater that connects gradually, set up one-level water spray attemperator between the export of one-level over heater and the entry of second grade over heater, set up second grade water spray attemperator between the export of second grade over heater and tertiary over heater's the entry, the water-cooling wall with set up the more than one branch flow point that is used for shunting steam on the connecting pipeline between the tertiary over heater. The amount of steam entering a steam turbine is reduced through steam shunting, the generated energy is reduced, and the thermoelectric decoupling function of the thermal power generating unit is realized; the minimum output load can be reduced to below 15% on the premise of ensuring large-scale heat supply load, a proper shunting point can be selected according to the actual steam extraction and heat utilization requirements of users, and the grade of equipment materials such as shunting pipelines, valves and the like is reduced, so that the investment cost of the system is greatly reduced.
Description
Technical Field
The utility model belongs to the boiler field especially relates to a thermoelectric decoupling zero system based on reposition of redundant personnel of boiler superheated steam.
Background
The coal-fired power generation occupation ratio is in a descending trend under the background of 'double carbon', the flexible peak regulation of the thermal power unit is normalized gradually, and meanwhile, the thermal power unit also needs to undertake the tasks of steam supply and heating in the heating period. Therefore, thermal power plants at present need to perform thermoelectric decoupling to meet the requirement of deep peak shaving. The thermoelectric decoupling can enlarge the output adjustment range of the unit and reduce the proportion of the generated energy and the calorific value in the cogeneration process.
The technology for realizing thermoelectric decoupling in the prior art mainly comprises a low-pressure cylinder cutting technology, a bypass steam heat supply technology, an electric boiler technology and a battery energy storage technology. The low-pressure cylinder cutting technology leads all the exhaust steam of the medium-pressure cylinder out through a steam extraction pipeline, only a small amount of cooling steam is reserved to enter the low-pressure cylinder, so that the low-pressure cylinder does not work, although the scheme can greatly reduce the power supply load of the unit, the total load of the unit is about 40 percent due to the high operation load of the medium-pressure cylinder, and deeper thermoelectric decoupling cannot be performed; the electric boiler technology utilizes the electric energy of the unit to generate heat energy, and has the problems of low efficiency and the like; the bypass steam heat supply technology utilizes a steam bypass system during the starting period of the unit, superheated steam is subjected to temperature reduction and pressure reduction and then is supplied with heat, the quality of the steam is reduced, the bypass system is designed under low load, the flow of the extracted steam is small, and the thermoelectric decoupling degree is insufficient; the battery energy storage technology has higher cost and potential safety hazard. Therefore, the optimization of the thermoelectric decoupling technology to realize the deeper peak regulation capability of the unit has important significance.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a thermoelectric decoupling zero system based on boiler superheated steam reposition of redundant personnel is provided, under the prerequisite of guaranteeing unit energy utilization efficiency and steam quality, realizes the deep tone ability below the unit 15%.
In order to solve the technical problem, the utility model provides a thermoelectric decoupling zero system based on boiler superheated steam shunts, including water-cooling wall, one-level over heater, second grade over heater and the tertiary over heater that connects gradually, the export of one-level over heater with set up one-level water spray attemperator between the entry of second grade over heater, the export of second grade over heater with set up second grade water spray attemperator between the entry of tertiary over heater, the water-cooling wall with set up the more than one branch flow point that is used for shunting steam on the connecting pipeline between the tertiary over heater.
Furthermore, a branch flow point is arranged on a connecting pipeline between the water wall and the tertiary superheater, and the branch flow point is positioned at an outlet of the water wall, an outlet of the primary superheater or an outlet of the secondary superheater.
Furthermore, two flow dividing points are arranged on a connecting pipeline between the water wall and the tertiary superheater, and the two flow dividing points are respectively positioned at an outlet of the water wall and an outlet of the primary superheater, an outlet of the water wall and an outlet of the secondary superheater or an outlet of the primary superheater and an outlet of the secondary superheater.
Furthermore, three shunting points are arranged on a connecting pipeline between the water wall and the tertiary superheater, and the three shunting points are respectively positioned at an outlet of the water wall, an outlet of the primary superheater and an outlet of the secondary superheater.
Furthermore, a flow regulating valve is arranged on the flow dividing pipeline connected with the flow dividing point.
Furthermore, a pressure relief valve is arranged on the flow dividing pipeline connected with the flow dividing point, and the pressure of the divided steam is adjusted through the pressure relief valve according to the requirements of users.
The method for thermoelectric decoupling by using the thermoelectric decoupling system based on boiler superheated steam shunting comprises the steps of carrying out steam shunting from shunting points when the number of the shunting points is one during thermoelectric decoupling, and selecting one shunting point from a plurality of shunting points to carry out steam shunting when the number of the shunting points is more than two.
Further, after the steam is split, the water spray attemperating device in front of the selected splitting point operates normally, and the water spray attemperating device behind the selected splitting point operates by increasing the water spray amount.
The heat that steam absorbed in the over heater is certain, if the import steam volume of over heater becomes low, then the temperature of export steam will be higher than former design value, because the material that the boiler was made all is according to the temperature everywhere, the suitable material of pressure selection, consequently in case take place the overtemperature, the material will take place to damage to the unable normal operating of boiler, consequently extract behind the steam, need carry out the water spray desuperheating before getting into the over heater, make the export temperature of over heater always within the safe value. In addition, because the steam temperature of the residual steam heated by the superheater is different due to different positions of extracted steam, in order to ensure that the temperature is always within a safe range, the water spraying amount of the water spraying temperature reducing device behind the flow dividing point needs to be controlled respectively, and the specific value of the water spraying amount is determined according to the characteristics that the extracted amount of the steam and the absorbed heat are constant.
During the non-peak-shaving period, the water spraying temperature reduction device is in a normal operation state, quantitative water is sprayed, the safe operation of the boiler is ensured, and related parameters are determined according to the design process of the boiler; during the peak regulation period, namely during the thermoelectric decoupling period, the water spraying amount of the water spraying temperature reduction device needs to be increased according to the designed steam extraction amount, the safe operation of the subsequent heating surfaces of all levels of the water spraying temperature reduction device is ensured, and potential safety hazards such as overtemperature and the like do not occur.
Further, during thermoelectric decoupling, the split steam flow at the split point does not exceed 50% of the pre-split steam flow.
Has the advantages that:
the utility model provides a thermoelectric decoupling zero system based on reposition of redundant personnel of superheated steam of boiler, including water-cooling wall, one-level over heater, second grade over heater and the tertiary over heater that connects gradually, the export of one-level over heater with set up one-level water spray attemperator between the entry of second grade over heater, the export of second grade over heater with set up second grade water spray attemperator between tertiary over heater's the entry, the water-cooling wall with set up the more than one branch stream point that is used for shunting steam on the connecting pipeline between the tertiary over heater. The amount of steam entering a steam turbine is reduced through steam shunting, the generated energy is reduced, and the thermoelectric decoupling function of the thermal power generating unit is realized; the heat energy of the steam is directly utilized, so that the conversion between energy forms, such as electric energy-heat energy conversion, is avoided, and the energy utilization efficiency of the unit is ensured; the technical scheme has no influence on the heat supply load of a boiler part, the output load can be reduced on the premise, the specific minimum output load is determined according to the minimum output load of the steam turbine, and the minimum output load of the steam turbine is about 15% under the general condition, so that the minimum output load of the unit can be reduced to below 15% on the premise of ensuring the large-scale heat supply load, a proper shunting point can be selected according to the actual steam extraction heat demand of a user, the grades of equipment materials such as shunting pipelines, valves and the like are reduced, and the investment cost of the system is greatly reduced.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a thermoelectric decoupling system based on boiler superheated steam splitting;
reference numerals:
1. a water cooled wall; 2. a primary superheater; 3. a secondary superheater; 4. a tertiary superheater; 5. a first stage water spray desuperheating device; 6. a secondary water spray temperature reduction device; 7. a flow regulating valve; 8. a first tapping point; 9. a second tapping point; 10. a third tapping point.
Detailed Description
The present invention will be further described with reference to the following detailed description. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
Example 1:
as shown in fig. 1, in a preferred embodiment, each design parameter of a certain 660MW ultra supercritical generator set is taken as a boundary condition, and a thermoelectric decoupling system based on boiler superheated steam splitting is provided, including a water wall 1, a primary superheater 2, a secondary superheater 3, a tertiary superheater 4, a primary water spray attemperating device 5, a secondary water spray attemperating device 6, and three splitting points, where the three splitting points are a first splitting point 8, a second splitting point 9, and a third splitting point 10, the first splitting point 8, the second splitting point 9, and the third splitting point 10 are respectively located at an outlet of the water wall 1, an outlet of the primary superheater 2, and an outlet of the secondary superheater 3, and flow regulating valves 7 are respectively disposed on splitting pipelines connected to the first splitting point 8, the second splitting point 9, and the third splitting point 10.
The first-stage water spraying temperature reducing device 5 is respectively connected with the outlet of the first-stage superheater 2 and the inlet of the second-stage superheater 3, and the second-stage water spraying temperature reducing device 6 is respectively connected with the outlet of the second-stage superheater 3 and the inlet of the third-stage superheater 4.
Boiler feed water becomes steam after passing through the water wall 1, and then becomes superheated steam at the outlet of the boiler after passing through the primary superheater 2, the secondary superheater 3 and the tertiary superheater 4.
The method for performing thermoelectric decoupling by using the thermoelectric decoupling system based on boiler superheated steam shunting comprises the following steps:
the boiler operates at the lowest load of 30 percent, the steam turbine operates at the lowest feasible load of about 15 percent, the mass flow, the temperature and the pressure of steam at the outlet of the water-cooled wall 1 are 565t/h, 392 ℃ and 10.29MPa respectively, 280t/h of steam is extracted from a first diversion point 8, and superheated steam of 3MPa, 320 ℃ and 280t/h can be provided for a user after pressure is released through a pressure release valve; the water spraying amount of the first-stage water spraying temperature reducing device 5 needs to be increased to 55t/h, and the water spraying amount of the second-stage water spraying temperature reducing device 6 needs to be increased to 20t/h, so that the safe operation of the system is ensured.
Example 2:
the thermoelectric decoupling system based on boiler superheated steam splitting provided in the embodiment is the same as the first embodiment, and the difference is that:
during the thermoelectric decoupling period, the boiler operates at the lowest load of 30 percent, the steam turbine operates at the lowest feasible load of about 15 percent, the mass flow, the temperature and the pressure of steam at the outlet of the primary superheater 2 are 565t/h, 420 ℃ and 10.29MPa respectively, 280t/h of steam is extracted from a second diversion point 9, and superheated steam of 3MPa, 360 ℃ and 280t/h can be provided for a user after heat exchange through the heat exchanger; the water spraying amount of the first-stage water spraying temperature reducing device 5 needs to be increased to 40t/h, and the water spraying amount of the second-stage water spraying temperature reducing device 6 needs to be increased to 20t/h, so that the safe operation of the system is ensured.
Example 3:
the thermoelectric decoupling system based on boiler superheated steam splitting provided in the embodiment is the same as the first embodiment, and the difference is that:
during the thermoelectric decoupling, the boiler operates at the lowest load of 30 percent, the steam turbine operates at the lowest feasible load of about 15 percent, the mass flow, the temperature and the pressure of steam at the outlet of the secondary superheater 3 are 565t/h, 566 ℃ and 10.29MPa respectively, 280t/h of steam is extracted from the third diversion point 10, and the superheated steam at 3MPa, 520 ℃ and 280t/h can be provided for a user after heat exchange through the heat exchanger; the first-stage water spraying temperature reduction device 5 operates normally, and the second-stage water spraying temperature reduction device 6 needs to increase the water spraying amount to 20t/h so as to ensure the safe operation of the system.
Therefore, the utility model discloses can realize thermal power generating unit's thermoelectric decoupling zero function, the minimum output load of unit under the prerequisite of guaranteeing extensive heat supply load can fall to below 15%, can select suitable shunting point according to user's actual steam extraction with the hot demand, reduces the grade of equipment materials such as reposition of redundant personnel pipeline, valve to reduce system investment cost by a wide margin.
Finally, it should be noted that: the present invention is not limited to the above embodiments, and all the equivalent structures or equivalent processes that are used in the specification and the attached drawings are transformed or directly or indirectly used in other related technical fields, and all the same principles are included in the protection scope of the present invention.
Claims (6)
1. The thermoelectric decoupling system based on boiler superheated steam shunting is characterized by comprising a water wall (1), a first-stage superheater (2), a second-stage superheater (3) and a third-stage superheater (4) which are sequentially connected, wherein a first-stage water spray attemperator (5) is arranged between an outlet of the first-stage superheater (2) and an inlet of the second-stage superheater (3), a second-stage water spray attemperator (6) is arranged between an outlet of the second-stage superheater (3) and an inlet of the third-stage superheater (4), and more than one shunting point for shunting steam is arranged on a connecting pipeline between the water wall (1) and the third-stage superheater (4).
2. The decoupling system of claim 1, wherein a splitting point is provided on a connecting pipeline between the water wall (1) and the tertiary superheater (4), and the splitting point is located at an outlet of the water wall (1), an outlet of the primary superheater (2) or an outlet of the secondary superheater (3).
3. The boiler superheated steam flow splitting-based thermoelectric decoupling system as claimed in claim 1, wherein two flow splitting points are arranged on a connecting pipeline between the water wall (1) and the tertiary superheater (4), and are respectively positioned at an outlet of the water wall (1) and an outlet of the primary superheater (2), an outlet of the water wall (1) and an outlet of the secondary superheater (3), or an outlet of the primary superheater (2) and an outlet of the secondary superheater (3).
4. The boiler superheated steam flow splitting-based thermoelectric decoupling system as claimed in claim 1, wherein three flow splitting points are arranged on a connecting pipeline between the water wall (1) and the tertiary superheater (4), and the three flow splitting points are respectively positioned at an outlet of the water wall (1), an outlet of the primary superheater (2) and an outlet of the secondary superheater (3).
5. The system for decoupling the heat and the electricity based on the diversion of the superheated steam of the boiler as claimed in claim 1, wherein a flow regulating valve (7) is arranged on a branch pipeline connected with a diversion point.
6. The system of claim 1, wherein a pressure relief valve is provided on the bypass line connected to the bypass point for relieving pressure on the bypassed steam.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659094A (en) * | 2022-04-22 | 2022-06-24 | 上海锅炉厂有限公司 | Thermoelectric decoupling system and method based on boiler superheated steam shunting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114659094A (en) * | 2022-04-22 | 2022-06-24 | 上海锅炉厂有限公司 | Thermoelectric decoupling system and method based on boiler superheated steam shunting |
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