Peak shaving device of thermal power generating unit
By using evaporation and concentration components and baffle components in thermal power units, the problems of boiler heat dissipation and wastewater treatment have been solved, achieving efficient heat absorption and resource utilization of wastewater, and improving the economic benefits of power plants.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-04-07
AI Technical Summary
When thermal power units maintain minimum load, internal heat accumulates and cannot be dissipated, and the wastewater generated cannot be effectively treated, causing coal fly ash to lose its economic value and incur additional treatment costs.
By employing evaporation and concentration components and baffle components, heat is absorbed from inside the boiler through the reheater, extending the residence time of gas in the reheater and increasing heat absorption efficiency. Steam is controlled to enter the heat exchanger through a steam flow regulating valve, thereby achieving independent evaporation and concentration of wastewater and obtaining raw materials for descaling agents.
It effectively consumes the heat generated by the boiler when it is at minimum load, improves heat absorption efficiency, avoids coal fly ash pollution, obtains high-value descaling agent raw materials, and increases power plant revenue.
Smart Images
Figure CN224091653U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of thermal power generating unit, especially a kind of thermal power generating unit peak shaving device. BACKGROUND
[0002] With the gradual increase of new energy installation scale such as photovoltaic and wind power, thermal power generating unit needs to participate in power grid peak shaving more frequently;When new energy power generation is larger, thermal power generating unit reduces load as much as possible and keeps running;Because power station boiler itself has the limitation of non-combustion minimum stable combustion load, so the minimum load of unit maintaining economic operation is usually the non-combustion minimum stable combustion load of boiler;In order to better adapt to the situation of future new energy installation continues to grow, thermal power generating unit carries out various flexible modification to further reduce its minimum output for maintaining stable operation.
[0003] On the other hand, the flue gas generated by the coal combustion of the power station boiler will produce wastewater containing corrosive chloride ions in the process of pollutant removal. The mainstream technical solution currently adopted is to spray the wastewater into high-temperature flue gas by using atomizing nozzles, evaporate and crystallize the salt contained in the wastewater under high-temperature conditions, and mix the solid particles into the coal fly ash. This brings a serious problem that the ash containing high-concentration chloride salt pollutes the entire fly ash. The coal fly ash of the thermal power plant can originally be sold to the cement plant as raw material to obtain certain economic benefits. Because the chloride ions in the fly ash exceed the standard, the coal fly ash cannot be used for cement production, so the economic value of the coal fly ash is lost, and instead an additional expense for treating "solid waste" is needed. The existing heat dissipation fins absorb part of the heat inside the boiler to reduce the accumulation of heat inside the boiler. However, due to the high moving speed of hot gas, the heat absorbed by the heat dissipation fins is reduced, resulting in low efficiency of the heat dissipation fins in absorbing the heat inside the boiler. Therefore, a thermal power generating unit peak shaving device is proposed to solve the above problems. SUMMARY
[0004] This section aims to outline some aspects of the embodiments of the present utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name. Such simplifications or omissions cannot be used to limit the scope of the utility model.
[0005] In view of the technical problems of the existing technology that the internal heat of the boiler cannot be dissipated when maintaining the minimum load and the wastewater generated by the generator set cannot be treated, the present utility model is proposed.
[0006] To solve the above technical problems, the utility model provides the following technical scheme: a thermal power generating unit peak shaving device, comprising,
[0007] An evaporation and concentration assembly includes a reheater, a cold reheat pipe disposed at the reheater inlet, and a hot reheat pipe disposed at the reheater outlet; and,
[0008] Boiler pipes located outside the reheater; and,
[0009] A barrier assembly is used to increase the time that gas remains inside the reheater.
[0010] As a preferred embodiment of the peak-shaving device for thermal power units of this utility model, the blocking component includes a guide block and a control plate, both of which are fixed to the inner surface of the boiler pipe.
[0011] As a preferred embodiment of the peak-shaving device for thermal power units of this utility model, the blocking component includes a guide column, which is disposed inside the reheater, and the reheater is staggered inside the guide column.
[0012] As a preferred embodiment of the peak-shaving device for thermal power units of this utility model, the blocking component includes an outer layer plate, an inner layer plate and a wind guide plate, wherein the inner layer plate is disposed inside the outer layer plate.
[0013] As a preferred embodiment of the peak-shaving device for thermal power units of this utility model, the air guide plate is disposed inside the reheater and the air guide plate is disposed at intervals.
[0014] As a preferred embodiment of the peak-shaving device for thermal power units of this utility model, the surface of the hot reheat pipe is connected to a steam flow regulating valve, and the other end of the steam flow regulating valve is connected to an extraction steam pipe.
[0015] As a preferred embodiment of the peak-shaving device for thermal power units of this utility model, the other end of the extraction steam pipe is connected to a heat exchanger, and the surface of the heat exchanger is connected to a condensate pipe.
[0016] As a preferred embodiment of the peak-shaving device for thermal power units of this utility model, the outer surface of the heat exchanger is provided with a housing.
[0017] As a preferred embodiment of the peak-shaving device for thermal power units of this utility model, the surface of the housing is provided with openings, and the extraction steam pipe and condensate pipe are provided with openings inside.
[0018] As a preferred embodiment of the peak-shaving device for thermal power units of this utility model, one end of the boiler pipe is connected to the interior of the boiler.
[0019] The beneficial effects of the peak-shaving device for thermal power units of this utility model are as follows: by absorbing the temperature inside the boiler through the reheater, the heat generated by the boiler when maintaining minimum load is consumed; the blocking component can slow down the flow rate of gas and prolong the residence time of hot gas inside the reheater, thereby increasing the efficiency of heat absorption by the reheater; at the same time, the amount of steam entering the heat exchanger is controlled by the steam flow regulating valve, thereby independently evaporating and concentrating chlorine-containing wastewater, effectively avoiding pollution of coal fly ash; and at the same time, it can evaporate and crystallize the salt contained in wastewater containing corrosive chloride ions to obtain raw materials for descaling agents with strong acidity, thereby improving the profitability of power plants. Attached Figure Description
[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the structure of this utility model.
[0022] Figure 2 This is a cross-sectional structural diagram of the present invention.
[0023] Figure 3 This is a schematic diagram of the structure of the first embodiment of the present utility model.
[0024] Figure 4 This is a schematic diagram of the structure of the second embodiment of the present utility model.
[0025] Figure 5 This is a cross-sectional structural diagram of the second embodiment of the present invention.
[0026] Figure 6 This is a structural schematic diagram of the third embodiment of the present utility model.
[0027] Figure 7 This is a schematic diagram of the top structure of the third embodiment of the present invention.
[0028] Figure 8 This is a cross-sectional structural diagram of the third embodiment of the present invention. Detailed Implementation
[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0030] Example 1, referring to Figures 1-8This is the first embodiment of the present invention, which provides a peak-shaving device for thermal power units, comprising:
[0031] The evaporation and concentration assembly 1 includes a reheater 11, a cold reheat pipe 12 disposed at the inlet of the reheater 11, and a hot reheat pipe 13 disposed at the outlet of the reheater 11; and,
[0032] Boiler pipes 2 located outside the reheater 11; and,
[0033] The blocking component 4 is used to increase the time that the gas stays inside the reheater 11.
[0034] The blocking component 4 slows down the gas flow rate by narrowing the gas passage path and disrupting the gas passage. By extending the residence time of the gas inside the reheater 11, the blocking component 4 prolongs the heat exchange time between the gas and the fins of the reheater 11, thereby increasing the heat absorption efficiency.
[0035] The blocking assembly 4 includes a guide block 41 and a control plate 42, both of which are fixed to the inner surface of the boiler pipe 2.
[0036] The guide block 41 is located in the middle of the control plate 42, which is located on the inner wall of the boiler pipe 2. When the gas flows, it passes between the guide block 41 and the control plate 42. As the path becomes narrower, the overall flow rate of the gas slows down, thus prolonging the residence time of the gas.
[0037] A steam flow regulating valve 31 is connected to the surface of the hot reheat pipe 13, and the other end of the steam flow regulating valve 31 is connected to the extraction steam pipe 32.
[0038] The steam flow regulating valve 31 controls the amount of steam passing through to ensure that the heat of the high-temperature gas is fully absorbed by the sewage inside the housing 34, thereby reducing the waste of high-temperature gas.
[0039] The other end of the steam extraction pipe 32 is connected to a heat exchanger 33, and a condensate pipe 35 is connected to the surface of the heat exchanger 33.
[0040] After the heat from the heat exchanger 33 is absorbed by the sewage, the internal gas temperature decreases and turns into condensate, which enters the condensate pipe 35. The condensate pipe 35 is connected to the turbine pipe to achieve recycling.
[0041] A housing 34 is provided on the outer surface of the heat exchanger 33.
[0042] The housing 34 can restrict the position of the sewage, allowing the sewage to fully contact the surface of the heat exchanger 33. At the same time, the crystals left after the sewage evaporates can remain inside the housing 34 for easy collection later.
[0043] The surface of the housing 34 is provided with openings, and the steam extraction pipe 32 and the condensate pipe 35 are provided with the interior of the openings.
[0044] The opening allows the steam extraction pipe 32 and the condensate pipe 35 to easily enter the interior of the chamber 34 from the outside, preventing sewage from overflowing, while ensuring that heat accumulates inside the chamber 34 to ensure the continuous boiling of sewage.
[0045] One end of boiler pipe 2 is connected to the inside of the boiler.
[0046] Boiler pipe 2 is directly connected to the boiler, which reduces the heat transmission channels and avoids heat loss. At the same time, it extracts heat directly from inside the boiler, which reduces the accumulation of heat inside the boiler and ensures that the boiler can maintain minimum load for a long time.
[0047] Operating Procedure: When the boiler needs to maintain minimum load, the cold reheat pipe 12 is a thick metal pipe connecting the exhaust port of the high-pressure cylinder of the steam turbine to the inlet of the reheater 11. The boiler pipe 2 is connected to the boiler interior, so the hot gas inside the boiler passes through the reheater 11 to heat it. Because the hot gas is obstructed to a certain extent by the guide block 41 and the control plate 42, the flow rate of the hot gas inside the reheater 11 slows down, increasing the contact time between the hot gas and the reheater 11, thereby increasing the conduction efficiency. The low-temperature steam that has done work in the high-pressure cylinder of the steam turbine is sent to the reheater 11 for heating through the cold reheat pipe 12. The hot reheat pipe 13 connects the outlet of the reheater 11 to the inlet of the intermediate-pressure cylinder of the steam turbine. The thick metal pipe is used to send the heated steam into the intermediate pressure cylinder of the steam turbine to do work again. After the steam volume regulating valve 31 is opened, the high-temperature steam enters the heat exchanger 33 through the extraction steam pipe 32. The heat of the steam is absorbed by the chlorine-containing wastewater in the box 34, and the wastewater boils and evaporates, increasing the concentration of the wastewater. After simple filtration, the obtained acid solution can be used as a raw material for industrial descaling agents. The extraction steam volume regulating valve 31 is gradually opened to heat the wastewater. In order to ensure a stable and orderly heating process, a water thermometer is used to monitor the temperature change of the wastewater to avoid the wastewater splashing due to excessive heating. The cooled steam condensate can be recycled into the unit condensate through the condensate pipe 35 for reuse.
[0048] Example 2, refer to Figures 1-8 This is the second embodiment of the present invention, which provides a peak-shaving device for thermal power units, comprising:
[0049] The evaporation and concentration assembly 1 includes a reheater 11, a cold reheat pipe 12 disposed at the inlet of the reheater 11, and a hot reheat pipe 13 disposed at the outlet of the reheater 11; and,
[0050] Boiler pipes 2 located outside the reheater 11; and,
[0051] The blocking component 4 is used to increase the time that the gas stays inside the reheater 11.
[0052] The blocking component 4 slows down the gas flow rate by narrowing the gas passage path and disrupting the gas passage. By extending the residence time of the gas inside the reheater 11, the blocking component 4 prolongs the heat exchange time between the gas and the fins of the reheater 11, thereby increasing the heat absorption efficiency.
[0053] The blocking assembly 4 includes a guide post 43, which is disposed inside the reheater 11, and the reheater 11 is staggered inside the guide post 43.
[0054] The guide column 43 disrupts the gas passage, causing partial turbulence as the gas passes through. This turbulence impacts the normally moving airflow, thus affecting the normal movement of the gas and slowing down its speed.
[0055] Operating procedure: When the hot air moves inside the fins on the surface of the reheater 11, it is blocked by the guide plate 43, and the hot air is diverted. The diverted hot air collides with the nearby moving hot air, thereby slowing down the movement speed of the hot air inside the reheater 11 and increasing the time that the hot air stays inside the reheater 11.
[0056] Example 3, referring to Figures 1-8 This is the third embodiment of the present invention, which provides a peak-shaving device for thermal power units, comprising:
[0057] The evaporation and concentration assembly 1 includes a reheater 11, a cold reheat pipe 12 disposed at the inlet of the reheater 11, and a hot reheat pipe 13 disposed at the outlet of the reheater 11; and,
[0058] Boiler pipes 2 located outside the reheater 11; and,
[0059] The blocking component 4 is used to increase the time that the gas stays inside the reheater 11.
[0060] The blocking component 4 slows down the gas flow rate by narrowing the gas passage path and disrupting the gas passage. By extending the residence time of the gas inside the reheater 11, the blocking component 4 prolongs the heat exchange time between the gas and the fins of the reheater 11, thereby increasing the heat absorption efficiency.
[0061] The blocking assembly 4 includes an outer layer plate 44, an inner layer plate 45, and an air guide plate 46, with the inner layer plate 45 disposed inside the outer layer plate 44.
[0062] The inner plate 45 is located in the middle of the outer plate 44. The space in the middle of the inner plate 45 is larger than the space between the outer plate 44 and the inner plate 45. Therefore, most of the gas entering the outer plate 44 enters along the inner plate 45, thereby increasing the heat near the pipe on the surface of the reheater 11 and increasing the heat exchange efficiency.
[0063] Air guide plates 46 are installed inside the reheater 11, and the air guide plates 46 are spaced apart.
[0064] The air guide plates 46 are arranged inside the reheater 11 to guide the flow direction of the gas, causing the gas at both ends of the air guide plates 46 to flow separately. At the same time, the spaced arrangement causes the gas to form turbulence, further reducing the gas flow rate.
[0065] Operating process: Hot air enters the boiler pipe 2 and moves along the outer plate 44. The hot air is then diverted by the inner plate 45. Since the space inside the inner plate 45 is larger than the space between the outer plate 44 and the inner plate 45, most of the hot air enters the inner plate 45 and enters the vicinity of the pipe on the surface of the reheater 11, thereby increasing the temperature near the pipe of the reheater 11. At the same time, the spaced air guides 46 can guide the airflow forward, and the gaps in the air guides 46 can maintain the mutual flow of some hot air, thereby conducting heat to each other and effectively increasing the temperature of the pipe of the reheater 11.
[0066] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.
[0067] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.
[0068] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.
[0069] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A peak-shaving device for thermal power units, characterized in that: include, An evaporation and concentration assembly (1) includes a reheater (11), a cold reheat pipe (12) disposed at the inlet of the reheater (11), and a hot reheat pipe (13) disposed at the outlet of the reheater (11); and, Boiler pipes (2) located outside the reheater (11); and, A baffle assembly (4) installed inside the boiler pipe (2) or reheater (11).
2. The peak-shaving device for thermal power units as described in claim 1, characterized in that: The blocking assembly (4) includes a guide block (41) and a control plate (42), both of which are fixed to the inner surface of the boiler pipe (2).
3. The peak-shaving device for thermal power units as described in claim 1, characterized in that: The blocking assembly (4) includes a guide post (43) disposed inside the reheater (11), the reheater (11) being staggered inside the guide post (43).
4. The peak-shaving device for thermal power units as described in claim 1, characterized in that: The blocking assembly (4) includes an outer layer plate (44), an inner layer plate (45), and an air guide plate (46), wherein the inner layer plate (45) is disposed inside the outer layer plate (44).
5. The peak-shaving device for thermal power units as described in claim 4, characterized in that: The air guide plate (46) is disposed inside the reheater (11), and the air guide plate (46) is spaced apart.
6. The peak-shaving device for thermal power units as described in any one of claims 2-5, characterized in that: The surface of the hot reheat pipe (13) is connected to a steam flow regulating valve (31), and the other end of the steam flow regulating valve (31) is connected to a steam extraction pipe (32).
7. The peak-shaving device for thermal power units as described in claim 6, characterized in that: The other end of the extraction pipe (32) is connected to a heat exchanger (33), and a condensate pipe (35) is connected to the surface of the heat exchanger (33).
8. The peak-shaving device for thermal power units as described in claim 7, characterized in that: The outer surface of the heat exchanger (33) is provided with a housing (34).
9. The peak-shaving device for thermal power units as described in claim 8, characterized in that: The surface of the housing (34) is provided with openings, and the steam extraction pipe (32) and condensate pipe (35) are provided with the interior of the openings.
10. The peak-shaving device for thermal power units as described in claim 9, characterized in that: One end of the boiler pipe (2) is connected to the inside of the boiler.