CN219828793U - Boiler power generation system - Google Patents

Boiler power generation system Download PDF

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Publication number
CN219828793U
CN219828793U CN202321278151.4U CN202321278151U CN219828793U CN 219828793 U CN219828793 U CN 219828793U CN 202321278151 U CN202321278151 U CN 202321278151U CN 219828793 U CN219828793 U CN 219828793U
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medium
heat exchanger
boiler
pump
outlet
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CN202321278151.4U
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田欢
杨天亮
甄晓伟
杜永斌
牛涛
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Yantai Longyuan Power Technology Co Ltd
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Yantai Longyuan Power Technology Co Ltd
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Abstract

The utility model discloses a boiler power generation system which comprises a first medium cooling tank, a first medium cooling pump, a boiler, a first medium heating tank, a first medium heat pump, a first heat exchanger and a second heat exchanger arranged on the flue gas side of the boiler, wherein the first medium cooling tank, the first medium cooling pump, the boiler, the first medium heating tank, the first medium heat pump and the second heat exchanger are sequentially connected through a first medium loop. The first medium in the first medium cooling tank is pressurized by the first medium cooling pump and then enters the second heat exchanger at the smoke side of the boiler, the temperature is raised after the smoke heat is absorbed at the second heat exchanger and then enters the first medium heating tank for storage, the first medium in the first medium heating tank exchanges heat with condensation water in the condensation water system, the condensation water after heating enters the water supply side of the boiler, the first medium after temperature reduction continuously enters the boiler to absorb the smoke heat, so that the steam quantity of the boiler entering the steam turbine from the outlet is reduced, and the peak shaving can be carried out on a power grid to adapt to the online electric quantity of new energy.

Description

Boiler power generation system
Technical Field
The utility model relates to the technical field of energy storage and flexibility peak shaving of thermal power generating units, in particular to a boiler power generation system.
Background
With the increasing of energy demands and the decreasing of traditional petrochemical resources, new energy power generation such as wind power, photovoltaic power, hydropower power and the like is rapidly developed, the national wind power installation capacity is from 1.3 hundred million kilowatts to more than 2.2 hundred million kilowatts by 2020, the solar energy power generation capacity is from 4300 ten thousand kilowatts to more than 1.1 hundred million kilowatts, the new energy power generation capacity ratio is steadily increased, and the utilization hours of a thermal power unit are continuously reduced. However, the new energy power generation system is greatly influenced by external environmental factors, the phenomena of wind abandoning and light abandoning are serious, and the stability of the power grid load and the frequency response is greatly impacted, so that the large-scale surfing of new energy is influenced.
Therefore, how to provide a boiler power generation system to adapt the online power of new energy through peak shaving is a technical problem that needs to be solved by those skilled in the art at present.
Disclosure of Invention
In view of the above, the present utility model aims to provide a boiler power generation system, which is capable of adapting the online power of new energy through peak shaving.
In order to achieve the above object, the present utility model provides the following technical solutions:
a boiler power generation system comprises a first medium cooling tank, a first medium cooling pump, a boiler, a first medium heating tank, a first medium heat pump, a first heat exchanger and a second heat exchanger arranged on the flue gas side of the boiler;
the first medium cooling tank, the first medium cooling pump, the second heat exchanger, the first medium heating tank, the first medium heat pump and the first heat exchanger are sequentially connected through a first medium loop;
the hot end loop inlet of the first heat exchanger is communicated with the outlet of the first medium heat pump, and the hot end loop outlet of the first heat exchanger is communicated with the inlet of the first medium cold tank; the cold end loop inlet of the first heat exchanger is communicated with a condensate system, and the cold end loop outlet of the first heat exchanger is communicated with the water supply side of the boiler.
Optionally, in the above boiler power generation system, the condensate system includes a condensate pump and a pressurized water pump connected in sequence, and an outlet of the pressurized water pump is communicated with a cold end loop inlet of the first heat exchanger.
Optionally, in the above boiler power generation system, the cold end loop inlet of the second heat exchanger is communicated with the outlet of the first medium cold pump, and the cold end loop outlet of the second heat exchanger is communicated with the first medium hot tank.
Optionally, in the above boiler power generation system, the second heat exchanger includes an in-furnace heat exchanger and a tail heat exchanger connected in series in sequence, a cold end loop inlet of the in-furnace heat exchanger is communicated with an outlet of the first medium cold pump, and a cold end loop outlet of the tail heat exchanger is communicated with the first medium hot tank.
Optionally, in the above boiler power generation system, an outlet of the first medium heat pump is provided with a first valve;
and the outlet of the pressurized water pump is provided with a second valve.
Optionally, in the above boiler power generation system, an outlet of the first medium cooling pump is provided with a third valve;
the inlet of the first medium heating tank is provided with a fourth valve.
Optionally, in the above boiler power generation system, the outlet pipeline of the pressurized water pump includes a first branch and a second branch, the first branch is communicated with the cold end loop inlet of the in-furnace heat exchanger, and the second branch is communicated with the cold end loop inlet of the first heat exchanger;
a fifth valve is arranged on the first branch, and a sixth valve is arranged on the second branch;
the cold end loop outlet of the tail heat exchanger is communicated with the water supply side of the boiler through a heating condensation water pipeline, and a seventh valve is arranged on the heating condensation water pipeline.
Optionally, in the above boiler power generation system, the number of heat exchangers in the furnace is at least one group;
the number of the tail heat exchangers is at least one group.
Optionally, in the above boiler power generation system, the first medium is molten salt.
Optionally, in the above boiler power generation system, the system further comprises a salt dissolving system, and the first medium cooling tank is communicated with the salt dissolving system.
The utility model provides a boiler power generation system which comprises a first medium cooling tank, a first medium cooling pump, a boiler, a first medium heating tank, a first medium heat pump, a first heat exchanger and a second heat exchanger arranged on the flue gas side of the boiler, wherein the first medium cooling tank, the first medium cooling pump, the boiler, the first medium heating tank, the first medium heat pump and the second heat exchanger are sequentially connected through a first medium loop.
According to the boiler power generation system provided by the utility model, the first medium in the first medium cooling tank is pressurized by the first medium cooling pump and then enters the second heat exchanger at the smoke side of the boiler, the temperature is raised after the smoke heat is absorbed at the second heat exchanger and then enters the first medium heating tank for storage, the first medium in the first medium heating tank exchanges heat with the condensation water in the condensation water system, the condensation water after heating enters the water supply side of the boiler, the first medium after temperature reduction continuously enters the boiler to absorb the smoke heat, so that the steam quantity entering the steam turbine from the boiler outlet is reduced, the peak of a power grid can be regulated, the network electric quantity of new energy is adapted, and a stable operation foundation of an electric power system mainly comprising new energy in the future can be laid.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a system diagram of a boiler power generation system in accordance with an embodiment of the present utility model;
fig. 2 is a second system diagram of a boiler power generation system according to an embodiment of the present utility model.
The meaning of the individual reference numerals in fig. 1-2 is as follows:
101 is a first medium cooling tank, 102 is a first medium cooling pump, 103 is a third valve, 104 is an in-furnace heat exchanger, 105 is a tail heat exchanger, 106 is a fourth valve, 107 is a first medium heating tank, 108 is a first medium heat pump, 109 is a first valve, 110 is a first heat exchanger, 111 is a salt dissolving system, 112 is a condensate pump, 113 is a ninth valve, 114 is a pressurized water pump, 115 is a second valve, 116 is a first branch, 1161 is a fifth valve, 117 is a second branch, 1171 is a sixth valve, 118 is a heated condensate pipeline, 1181 is a seventh valve, and 119 is an eighth valve.
Detailed Description
The core of the utility model is to provide a boiler power generation system which can adapt to the online electric quantity of new energy in a peak regulation mode.
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, an embodiment of the present utility model discloses a boiler power generation system, which comprises a first medium cooling tank 101, a first medium cooling pump 102, a boiler, a first medium heating tank 107, a first medium heat pump 108, a first heat exchanger 110 and a second heat exchanger arranged on the flue gas side of the boiler.
The first medium cooling tank 101, the first medium cooling pump 102, the second heat exchanger, the first medium heating tank 107, the first medium heat pump 108 and the first heat exchanger 110 are sequentially connected through a first medium loop, so as to form a first medium circulation system. The boiler is connected to a turbine, and steam in the boiler enters the turbine to generate electricity, which is not shown in the figure.
The hot end loop inlet of the first heat exchanger 110 is communicated with the outlet of the first medium heat pump 108, the hot end loop outlet of the first heat exchanger 110 is communicated with the inlet of the first medium cooling tank 101, the cold end loop inlet of the first heat exchanger 110 is communicated with the condensate system, and the cold end loop outlet of the first heat exchanger 110 is communicated with the water supply side of the boiler. That is, at the first heat exchanger 110, the first medium in the first medium heat tank 107 exchanges heat with the condensed water, the first medium enters the first medium cold tank 101 for storage after being cooled, and the condensed water enters the water supply side of the boiler after being heated. It should be noted that the specific type of the first heat exchanger 110 is not limited, and is specifically selected according to practical situations. In order to adjust the amount of condensate entering the feed side of the boiler, an eighth valve 119 may be provided on the inlet pipe of the feed side of the boiler.
The first medium in the first medium cooling tank 101 enters the boiler after being pressurized by the first medium cooling pump 102, exchanges heat with the flue gas at the second heat exchanger on the flue gas side of the boiler, enters the first medium heating tank 107 for storage after being heated, exchanges heat with the condensation water in the condensation water system, enters the water supply side of the boiler after being heated, enters the boiler for heating to become steam, then enters the steam turbine for doing work, and the output of the unit can be improved.
In one embodiment, the temperature of the condensate in the condensate system is about 40-50 ℃ and the temperature of the condensate after heating is about 170 ℃. In the condensate system of the boiler, condensate is boosted by the condensate pump 112, and then sequentially enters the shaft seal heater, the low-pressure heater, the deaerator, the feed pump, the high-pressure heater, and then enters the boiler for heating. In the utility model, the heated condensation water can directly enter the deaerator, so that the energy consumption of the low-pressure heater can be reduced. The first medium after the temperature is reduced continuously enters the boiler to absorb the heat of the flue gas, so that the steam quantity entering the steam turbine from the boiler outlet is reduced, peak regulation of a power grid can be performed, and the operation flexibility is improved. The first medium can be molten salt or other energy storage medium, and the molten salt has the characteristics of high boiling point, low viscosity, low steam pressure and high volume heat, and is an excellent heat transfer and heat storage medium.
For convenience of explanation, the description will be given below taking the type of the first medium as an example of molten salt, where the temperature of the molten salt in the first medium cooling tank 101 is low, abbreviated as cold molten salt, and in a specific embodiment, the temperature of the cold molten salt is about 260 ℃, the temperature of the molten salt in the first medium heating tank 107 is high, abbreviated as hot molten salt, and in a specific embodiment, the temperature of the hot molten salt is about 560 ℃, and the first medium circulation system is abbreviated as molten salt circulation system.
In the boiler power generation system disclosed by the embodiment of the utility model, the condensate system comprises the condensate pump 112 and the pressurizing water pump 114 which are sequentially connected, and the outlet of the pressurizing water pump 114 is communicated with the cold end loop inlet of the first heat exchanger 110, namely, in the condensate circulating system of the boiler, condensate is led out after the condensate pump 112, enters the first heat exchanger 110 to exchange heat with hot molten salt after being pressurized by the pressurizing water pump 114, and enters the water supply side of the boiler after heat exchange. The pressurization water pump 114 may be configured to overcome the resistance of the first heat exchanger 110 and related pipelines, and those skilled in the art will understand that the pressurization water pump 114 may be a fixed-frequency water pump or a variable-frequency water pump, which is specifically selected according to practical situations. In order to regulate the amount of condensate entering the pressurized water pump 114, a ninth valve 113 may be provided on the line before the pressurized water pump 114.
The boiler power generation system disclosed by the embodiment of the utility model is characterized in that a second heat exchanger is arranged in the boiler, the cold end loop inlet of the second heat exchanger is communicated with the outlet of the first medium cold pump 102, the cold end loop outlet of the second heat exchanger is communicated with the first medium heat tank 107, namely cold molten salt enters the boiler to exchange heat with flue gas at the second heat exchanger, and the flue gas heat is absorbed and then is changed into hot molten salt to enter the first medium heat tank 107 for storage, so that the redundant heat of the flue gas can be stored in the hot molten salt, the load of a steam turbine can be lower than that of the boiler, the contradiction between deep peak regulation of a thermal power unit and low-load operation of the boiler can be solved, and the deep peak regulation capacity and peak electricity-retaining capacity of the unit can be further improved. In a specific embodiment, the flow rate of the molten salt in the second heat exchanger is in the range of 2m/s-4m/s.
In a specific embodiment of the present utility model, the second heat exchanger comprises an in-furnace heat exchanger 104 and a tail heat exchanger 105 which are sequentially connected in series, specifically, the in-furnace heat exchanger 104 is arranged inside a boiler furnace, the tail heat exchanger 105 is arranged at the tail of the boiler furnace, a cold end loop inlet of the in-furnace heat exchanger 104 is communicated with an outlet of the first medium cold pump 102, and a cold end loop outlet of the tail heat exchanger 105 is communicated with the first medium hot tank 107. The cold molten salt sequentially enters the in-furnace heat exchanger 104 to perform first heat exchange with the flue gas, the heat of the flue gas is absorbed, the cold molten salt heated by the in-furnace heat exchanger 104 enters the tail heat exchanger 105 to perform second heat exchange with the flue gas, and the cold molten salt is changed into hot molten salt after being heated to enter the first medium heat tank 107 for storage. The arrangement of the heat exchanger 104 in the furnace and the heat exchanger 105 at the tail part can ensure that the cold molten salt and the flue gas in the boiler can exchange heat fully. It should be noted that, at least one group of heat exchangers 104 is provided in the furnace, at least one group of heat exchangers 105 is provided in the tail, and the specific number is specifically set according to the actual situation.
In order to facilitate adjustment of the amount of hot molten salt entering the first heat exchanger 110, in a specific embodiment of the present utility model, the outlet of the first medium heat pump 108 is provided with a first valve 109, and the amount of hot molten salt entering the first heat exchanger 110 can be adjusted by adjusting the opening of the first valve 109, so that the temperature of the condensed water heated by the first heat exchanger 110 can be controlled.
In order to facilitate the adjustment of the amount of condensate entering the first heat exchanger 110, the outlet of the pressurized water pump 114 is provided with a second valve 115, and the amount of condensate entering the first heat exchanger 110 can be adjusted by adjusting the opening of the second valve 115, so that the temperature of the cold molten salt cooled by the first heat exchanger 110 can be controlled. The second valve 115 may be omitted, and the amount of condensate entering the first heat exchanger 110 may be adjusted by adjusting the frequency of the pressurized water pump 114. The specific types of the first valve 109 and the second valve 115 are not limited, and a gate valve, a butterfly valve, etc. may be selected as long as the regulation function is provided.
In order to be able to adjust the amount of molten salt entering the boiler according to the load of the steam turbine, in a specific embodiment of the utility model the outlet of the first medium cooling pump 102 is provided with a third valve 103 and the inlet of the first medium heating tank 107 is provided with a fourth valve 106. By adjusting the opening of the third valve 103 and the fourth valve 106, the amount of molten salt entering the boiler can be adjusted according to the load of the turbine.
In order to prevent the in-boiler heat exchanger 104 and the tail heat exchanger 105 in the boiler from dry burning or over-temperature when the molten salt circulation system is out of service or in an accident condition, in a specific embodiment of the utility model, the molten salt circulation system is further provided with a standby system.
As shown in fig. 2, the outlet pipeline of the pressurized water pump 114 includes a first branch 116 and a second branch 117, the first branch 116 is communicated with the cold end loop inlet of the in-furnace heat exchanger 104, the second branch 117 is communicated with the cold end loop inlet of the first heat exchanger 110, the first branch 116 is provided with a fifth valve 1161, the second branch 117 is provided with a sixth valve 1171, the cold end loop outlet of the tail heat exchanger 105 is communicated with the water supply side of the boiler through a heating condensation water pipeline 118, and the heating condensation water pipeline 118 is provided with a seventh valve 1181.
When the molten salt circulation system is operated, the fifth valve 1161 and the seventh valve 1181 are in an off state, and the molten salt circulation system is connected with the boiler. When the molten salt circulation system is out of service or in an accident condition, the third valve 103, the fourth valve 106 and the sixth valve 1171 are in an off state, and the non-molten salt system is operated. The condensate water pressurized by the pressurizing water pump 114 enters the boiler, sequentially enters the heat exchanger 104 in the boiler and the heat exchanger 105 at the tail part to exchange heat with the flue gas, so as to prevent the heat exchanger 104 in the boiler and the heat exchanger 105 at the tail part from dry heating or over-temperature, and the heated condensate water enters the water supply side of the boiler, and in a specific embodiment, the temperature of the heated condensate water is about 200 ℃. In order to prevent vaporization of condensed water entering the boiler, the condensed water at the outlet of the pressurized water pump 114 should be in an enthalpy-lack state, and the pressure of the condensed water may be maintained between 2MPa and 5MPa, and the specific pressure value is specifically determined according to the actual situation.
In the boiler power generation system disclosed by the embodiment of the utility model, the first medium is the molten salt, the type of the molten salt can be nitrate, and other types of molten salt can be adopted, wherein in the nitrate, binary salts of potassium nitrate and sodium nitrate are preferred, and the specific type can be selected according to actual conditions.
In order to ensure that molten salt in a molten salt circulation system is in a liquid state, the boiler power generation system disclosed by the embodiment of the utility model further comprises a salt melting system 111, the first medium cooling tank 101 is communicated with the salt melting system 111, the salt melting system 111 is composed of common equipment, and the specific equipment composition and principle of the salt melting system are not repeated here. After the salt melting system 111 is completed, cold molten salt enters the first medium cooling tank 101 and enters the molten salt circulation system to participate in circulation.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
As used in the specification and in the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus. The inclusion of an element defined by the phrase "comprising one … …" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises an element.
The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the utility model. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims (10)

1. A boiler power generation system, characterized by comprising a first medium cooling tank (101), a first medium cooling pump (102), a boiler, a first medium heating tank (107), a first medium heat pump (108), a first heat exchanger (110) and a second heat exchanger arranged on the flue gas side of the boiler;
the first medium cooling tank (101), the first medium cooling pump (102), the second heat exchanger, the first medium heating tank (107), the first medium heat pump (108) and the first heat exchanger (110) are sequentially connected through a first medium loop;
the hot end loop inlet of the first heat exchanger (110) is communicated with the outlet of the first medium heat pump (108), and the hot end loop outlet of the first heat exchanger (110) is communicated with the inlet of the first medium cold tank (101); the cold end loop inlet of the first heat exchanger (110) is communicated with a condensate system, and the cold end loop outlet of the first heat exchanger (110) is communicated with the water supply side of the boiler.
2. The boiler power generation system according to claim 1, characterized in that the condensate system comprises a condensate pump (112) and a pressurized water pump (114) connected in sequence, the outlet of the pressurized water pump (114) being in communication with the cold side loop inlet of the first heat exchanger (110).
3. A boiler power generation system according to claim 2, characterized in that the cold side loop inlet of the second heat exchanger is in communication with the outlet of the first medium cold pump (102), and the cold side loop outlet of the second heat exchanger is in communication with the first medium heat tank (107).
4. A boiler power generation system according to claim 3, characterized in that the second heat exchanger comprises an in-furnace heat exchanger (104) and a tail heat exchanger (105) connected in series, the cold end loop inlet of the in-furnace heat exchanger (104) being in communication with the outlet of the first medium cold pump (102), the cold end loop outlet of the tail heat exchanger (105) being in communication with the first medium hot tank (107).
5. The boiler power generation system according to claim 4, wherein the outlet of the first medium heat pump (108) is provided with a first valve (109);
the outlet of the pressurized water pump (114) is provided with a second valve (115).
6. The boiler power generation system according to claim 5, characterized in that the outlet of the first medium cooling pump (102) is provided with a third valve (103);
the inlet of the first medium heating tank (107) is provided with a fourth valve (106).
7. The boiler power generation system according to claim 6, characterized in that the outlet line of the pressurized water pump (114) comprises a first branch (116) and a second branch (117), the first branch (116) being in communication with the cold side loop inlet of the in-furnace heat exchanger (104), the second branch (117) being in communication with the cold side loop inlet of the first heat exchanger (110);
a fifth valve (1161) is arranged on the first branch (116), and a sixth valve (1171) is arranged on the second branch (117);
the cold end loop outlet of the tail heat exchanger (105) is communicated with the water supply side of the boiler through a heating condensation water pipeline (118), and a seventh valve (1181) is arranged on the heating condensation water pipeline (118).
8. The boiler power generation system according to claim 4, wherein the number of heat exchangers (104) in the furnace is at least one group;
the number of the tail heat exchangers (105) is at least one group.
9. The boiler power generation system of any of claims 1-8, wherein the first medium is molten salt.
10. The boiler power generation system of claim 9 further comprising a salt melting system (111), said first medium cooling tank (101) being in communication with said salt melting system (111).
CN202321278151.4U 2023-05-23 2023-05-23 Boiler power generation system Active CN219828793U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202321278151.4U CN219828793U (en) 2023-05-23 2023-05-23 Boiler power generation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202321278151.4U CN219828793U (en) 2023-05-23 2023-05-23 Boiler power generation system

Publications (1)

Publication Number Publication Date
CN219828793U true CN219828793U (en) 2023-10-13

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Application Number Title Priority Date Filing Date
CN202321278151.4U Active CN219828793U (en) 2023-05-23 2023-05-23 Boiler power generation system

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CN (1) CN219828793U (en)

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