CN216894549U - Inverse heat-exchanging device for' water-molten salt-steam - Google Patents
Inverse heat-exchanging device for' water-molten salt-steam Download PDFInfo
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- CN216894549U CN216894549U CN202220605770.9U CN202220605770U CN216894549U CN 216894549 U CN216894549 U CN 216894549U CN 202220605770 U CN202220605770 U CN 202220605770U CN 216894549 U CN216894549 U CN 216894549U
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Abstract
The utility model relates to a 'water-molten salt-steam' inverse heat transfer device, which comprises a cold salt heat absorption system, a hot salt heat release system and a steam generation-steam temperature reduction, condensing and drainage cooling system; the steam generation-steam temperature reduction, condensation and drainage cooling system comprises a superheater-steam desuperheater, an evaporator-condenser and a preheater-drainage cooler which are sequentially connected in series; the salt side pipeline of the superheater-steam desuperheater is connected with a hot salt heat release system hot salt supply pipeline and a cold salt heat absorption system hot salt return pipeline, and the steam side pipeline of the superheater-steam desuperheater is respectively connected with a main steam supply pipeline, a plant/industrial steam supply pipeline and a bypass steam turbine reheating heat section steam extraction pipeline; the salt side pipeline of the preheater-drain cooler is positively connected with a cold salt supply pipeline of a cold salt heat absorption system and is reversely connected with a cold salt return pipeline of a hot salt heat release system, the water side water supply pipeline of the preheater-drain cooler is positively connected with a low-pressure water supply pipeline and a water supply pipeline of a high-pressure heater of a steam turbine respectively, and the water side drain pipeline of the preheater-drain cooler is reversely connected with a deaerator.
Description
Technical Field
The utility model relates to a design and an application method of a water-molten salt-steam two-medium inverse transformation heat device, in particular to a design and an application method of a water-molten salt-steam inverse transformation heat device, and belongs to the technical fields of flexible modification and manufacture of thermal power, active balance service, energy storage, virtual power stations, peak regulation and energy conservation.
Background
In the prior art, li ji, zhu peiwang and the like disclose that a boiler-high temperature heat storage-steam turbine integrated thermodynamic system is established by utilizing a thermodynamic equilibrium principle according to different thermodynamic characteristics of steam, water and molten salt in published thermal power unit flexibility modification technology based on high-temperature molten salt heat storage and application prospect analysis thereof, aiming at weakening original rigid connection boiler-machine coupling so as to realize deep peak regulation and flexible operation of the thermal power unit and simultaneously realize translation of boiler output at different times, but the technology has the defects that: firstly, the flexibility of the thermal power generating unit does not consider to be put into a main steam bypass system of the steam turbine when the power generated by the steam turbine is larger than the stable combustion load of the boiler; the thermal power generating unit is flexible and bypasses the main steam energy storage peak regulation operation when the generating power of the steam turbine is less than or equal to the stable combustion load thermal balance working condition of the boiler, the economy is poor, the thermoelectric decoupling capacity is small, and the peak regulation amplitude is low; and thirdly, the energy efficiency is low and the cost is high.
In addition, the balance between the boiler evaporation capacity and the steam turbine steam admission capacity is realized through setting up low pressure decompression desuperheater system to current thermal power flexibility transformation technique to provide the heating extraction that satisfies the parameter requirement in the thermoelectric decoupling period, specifically do: the main steam is sent to a reheating cold section steam pipeline after being subjected to pressure reduction and temperature reduction and then returns to a boiler reheater, so that the minimum safe flow of the reheater is ensured, and the reheater is prevented from being overtemperature; and, set up a set of pressure reduction desuperheater on the steam piping of hot section of reheating of unit, the desuperheating water comes from the condensate system, and a set of pressure reduction desuperheater makes the hot section of reheating steam supply to the heat supply network heating steam main pipe in the heat supply network head station as heat supply network heating steam after the heat supply network heating steam through the decompression desuperheating, but the shortcoming of this technique lies in: the main steam directly passes through a reheating cold section steam pipeline after pressure reduction and temperature reduction and returns to a boiler reheater, so that the energy loss is large, and the main steam is not suitable for the situation that the steam heat balance flow of the boiler reheater is smaller than the designed minimum steam flow of the boiler reheater under the target power of unit power generation; and secondly, a set of pressure reduction attemperators is arranged on a bypass steam pipeline of the reheating section of the unit, the attemperation water comes from a condensate system, the set of pressure reduction attemperators enables the bypass steam of the reheating section to be used as heating steam of a heat supply network after pressure reduction and temperature reduction, and then the heating steam is supplied to a heat supply network heating steam main pipe in a heat supply network head station, and a high-grade heat source is used for low-grade heat supply and is low in energy efficiency. And thirdly, the output of the boiler is at or below the output of the stable combustion load working condition of the boiler, the increase range of the peak shaving capacity and the heat supply capacity is small, and the load requirements of the power grid peak shaving, the cogeneration unit industry or the heating and heat supply of a novel power system are generally difficult to meet.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the present invention provides an inverse heat exchanger of water-molten salt-steam, which utilizes a set of devices with two reversible functions of absorbing and releasing heat to realize the heat conversion between two mediums.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a 'water-molten salt-steam' inverse heat transfer device comprises a cold salt heat absorption system, a hot salt heat release system and a steam generation-steam temperature reduction, condensing and drainage cooling system;
the steam generation-steam temperature reduction, condensation and drainage cooling system comprises a superheater-steam desuperheater, an evaporator-condenser and a preheater-drainage cooler which are sequentially connected in series;
the salt side pipeline of the superheater-steam desuperheater is connected with a hot salt supply pipeline of the hot salt heat release system, the steam side pipeline of the superheater-steam desuperheater is respectively connected with a main steam supply pipeline of a steam turbine, a plant/industrial steam supply pipeline and a reheating heat section steam extraction pipeline of a bypass steam turbine, the main steam supply pipeline of the steam turbine is connected with a high-pressure bypass main steam inlet pipeline of the steam turbine and is merged into main steam supply of a high-pressure cylinder of the steam turbine, and the main steam supply pipeline of the steam turbine is used for releasing heat of the hot salt heat release system and supplying the steam turbine for power generation;
the plant/industrial steam supply pipeline is connected with the plant/industrial steam system, is used for supplying plant/industrial steam after heat release and oxygen removal water supply of the hot salt heat release system are preheated, evaporated and superheated, and is used for supplying plant or industrial steam and molten salt heat absorption energy storage after the reheated steam is desuperheated by the superheater-steam desuperheater;
the bypass steam turbine reheating thermal section steam pipeline is connected with reheating thermal section steam pipeline of the boiler and bypasses the reheating thermal section steam entering the steam turbine intermediate pressure cylinder, and the bypass steam turbine reheating thermal section steam pipeline is used for steam admission of the bypass steam turbine intermediate pressure cylinder under the deep peak regulation working condition and energy storage through heat absorption of molten salt;
the salt side pipeline of the preheater-drain cooler is connected with the cold salt feeding pipeline of the cold salt heat absorption system in a forward direction, the water side water feeding pipeline of the preheater-drain cooler is respectively connected to the low-pressure water feeding pipeline and the water feeding pipeline of the steam turbine high-pressure heater water feeding system in the forward direction, and the water side drain pipeline of the preheater-drain cooler is reversely connected to the deaerator.
The 'water-molten salt-steam' inverse heat conversion device preferably comprises a cold salt tank, a cold salt pump salt supply valve, a first cold salt isolation valve, a preheater-drain cooler salt side pipeline, an evaporator-condenser salt side pipeline, a superheater-steam desuperheater salt side pipeline, a first hot salt isolation valve and a hot salt tank salt return valve, wherein the hot salt tank salt return pipeline is connected with the hot salt tank salt return valve;
the hot salt heat release system comprises a hot salt tank, a hot salt pump salt feeding valve, a first hot salt isolation valve, a salt side pipeline of a superheater-steam desuperheater, a salt side pipeline of an evaporator-condenser, a salt side pipeline of a preheater-hydrophobic cooler, a first cold salt isolation valve and a cold salt tank salt return valve which are connected with a cold salt return pipeline of the cold salt tank;
wherein, the cold salt of cold salt jar gives the salt pipeline and divides into two routes: the first path is connected with a hot salt return pipeline of the hot salt tank through the cold salt pump, a cold salt pump salt supply valve, a first cold salt isolation valve, a salt side pipeline of a preheater-drain cooler, a salt side pipeline of an evaporator-condenser, a salt side pipeline of a superheater-steam desuperheater, a first hot salt isolation valve and a hot salt tank salt return valve, and the second path is connected with a hot salt return pipeline of the hot salt tank through the cold salt pump, the cold salt pump salt supply valve, a second cold salt isolation valve, the salt side pipeline of the superheater-steam desuperheater, the first hot salt isolation valve and the hot salt tank salt return valve;
the hot salt supply pipeline of the hot salt tank is divided into two paths: the first path is connected with a cold salt return pipeline of the cold salt tank through the hot salt pump, a hot salt pump salt supply valve, a first hot salt isolation valve, a salt side pipeline of a superheater-steam desuperheater, a second hot salt isolation valve, a salt side pipeline of an evaporator-condenser, a salt side pipeline of a preheater-hydrophobic cooler, a first cold salt isolation valve and a cold salt tank salt return valve; the second path is connected with a cold salt return pipeline of the cold salt tank through the hot salt pump, the hot salt pump salt supply valve, the first hot salt isolation valve, the superheater-steam desuperheater, the second cold salt isolation valve and the cold salt tank salt return valve.
Preferably, a boiler feed pump inlet valve, a boiler feed pump and a turbine high-pressure heater water supply system are arranged on a water supply pipeline of the turbine high-pressure heater water supply system, and a water side water supply pipeline of the preheater-drain cooler is connected with the water supply pipeline of the turbine high-pressure heater water supply system through the high-pressure feed water inlet valve.
The 'water-molten salt-steam' inverse heat conversion device is preferably characterized in that a low-pressure water feed pump inlet valve, a low-pressure water feed pump and a low-pressure water feed pump outlet valve are arranged on the low-pressure water feed pipeline, and a water side water feed pipeline of the preheater-drain cooler is connected with the low-pressure water feed pipeline through the low-pressure water feed pump outlet valve; and a water side drain pipeline of the preheater-drain cooler is connected with the deaerator through a drain isolation valve.
The water-molten salt-steam inverse heat conversion device is preferably provided with a steam temperature-reducing steam supply pipeline on a steam side pipeline between the superheater-steam desuperheater and the evaporator-condenser, wherein the steam temperature-reducing steam supply pipeline is connected to a plant/industrial steam pipeline through a plant/industrial steam isolation valve and is used for supplying heat after steam extraction of a reheating section of the bypass steam turbine is subjected to temperature reduction through the superheater-steam desuperheater and heat absorption through molten salt.
Preferably, a second hot salt isolation valve is arranged on a salt side pipeline between the superheater-steam desuperheater and the evaporator-condenser, an evaporator steam side outlet valve is arranged on a steam side pipeline between the superheater-steam desuperheater and the evaporator-condenser, and a high-pressure bypass inlet stop valve and a turbine high-pressure bypass valve are arranged on the turbine high-pressure bypass pipeline.
The "water-molten salt-steam" inverse heat conversion device preferably includes a main steam isolation valve provided on a main steam supply pipeline of the turbine, a plant/industrial steam isolation valve provided on a plant/industrial steam supply pipeline, and a reheat thermal section steam extraction pressure adjustment valve and a reheat thermal section steam extraction isolation valve provided on a reheat thermal section steam extraction pipeline of the bypass turbine.
Due to the adoption of the technical scheme, the utility model has the following advantages:
1. the utility model integrates two system functions of heat absorption power function and heat release power function in a thermal power unit process diagram embedded into a high-temperature molten salt heat storage system into one device function, realizes heat transfer conversion of two media by using one device, and has two functions of bidirectional reversibility of heat absorption and heat release so as to adapt to heat absorption and heat storage in the off-peak period and heat release in the peak period of a power grid every day.
2. According to the utility model, the thermal power flexibility improved deep peak regulation ' bypass main steam pressure reduction and temperature reduction thermoelectric decoupling heat supply ' is changed into bypass steam turbine reheating hot section steam extraction pressure reduction and temperature reduction and fused salt energy storage ' thermoelectric decoupling ' heat supply ', so that the ' thermoelectric decoupling ' heat supply and peak regulation capacity and efficiency of the thermal power unit are improved.
3. The utility model realizes the mechanical furnace decoupling deep peak regulation of thermal power flexibility modification fused salt heat storage and release for the first time, uses the high energy storage efficiency in the production of high-temperature and high-pressure steam for power generation and heat supply, and the heat supply of industrial steam for production plants and the deep peak regulation, and improves the flexibility deep peak regulation operation economy of thermal power units.
Drawings
Fig. 1 is a process diagram of an apparatus for reverse heat transfer of "water-molten salt-steam" according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "forward", "reverse", "in", "out", "leading", "into", and the like refer to a directional or working fluid flow relationship and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the system or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used to define elements only for convenience in distinguishing between the elements, and unless otherwise stated have no special meaning and are not to be construed as indicating or implying any relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "assembled", "disposed" and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The forward direction refers to that the temperature of the heat storage medium is from low to high, the heat is absorbed by stored energy, and the temperature of the heat release medium is reduced from high to low enthalpy, and the heat release is vice versa.
The utility model realizes the heat conversion of two media by using a set of device, and has two functions of heat absorption and heat release which are reversible in two directions so as to adapt to the heat storage in the off-peak period and the heat release in the peak period of the power grid every day.
The following describes in detail the inverse heat exchanger of "water-molten salt-steam" in which two mediums provided by the embodiments of the present invention can be converted into each other by using a set of apparatus, with reference to the attached drawings.
As shown in figure 1, the inverse heat transfer device of water-molten salt-steam provided by the utility model comprises a cold salt heat absorption system, a hot salt heat release system and a steam generation-steam temperature reduction, condensation and drainage cooling system.
The steam generation-steam temperature reduction, condensation and drainage cooling system comprises a superheater-steam desuperheater 7, an evaporator-condenser 6 and a preheater-drainage cooler 5 which are sequentially connected in series. A salt side pipeline of the superheater-steam desuperheater 7 is connected with a hot salt supply pipeline of a hot salt heat release system, a steam side pipeline of the superheater-steam desuperheater 7 is respectively connected with a steam turbine main steam supply pipeline, a plant/industrial steam supply pipeline and a bypass steam turbine reheating hot section steam extraction pipeline, and the steam turbine main steam supply pipeline is connected with a steam turbine high-pressure bypass main steam inlet pipeline and is merged into main steam supply of a high-pressure cylinder 13-1 of a steam turbine 13 for heat release of the hot salt heat release system to supply the steam turbine to generate electricity; the plant/industrial steam supply pipeline is connected with the plant/industrial steam system, is used for supplying plant/industrial steam after heat release and oxygen removal of the hot salt heat release system and preheating, evaporation and overheating of supplied water, and is used for supplying plant or industrial steam and molten salt heat absorption and energy storage after the reheated steam is cooled by the superheater-steam desuperheater 7; the bypass steam turbine reheating section steam extraction pipeline is connected with a reheating steam supply pipeline of a boiler 12 for a steam turbine intermediate pressure cylinder 13-2, is used for absorbing heat of a cold salt heat absorption system and reducing the reheating steam inlet quantity of the steam turbine intermediate pressure cylinder 13-2, the unit is operated in a 'machine decoupling' deep peak regulation mode, a steam temperature reduction supply plant/industrial steam pipeline is connected with a plant/industrial steam pipeline 17, is used for bypass steam turbine reheating section steam extraction, and is used for reducing the temperature of molten salt heat absorption supply plant/industrial steam through a superheater-steam desuperheater 7, and the 'heat and electricity decoupling' heat supply and the deep peak regulation capacity of the unit are increased.
The salt side pipeline of the preheater-drain cooler 5 is positively connected with a cold salt feeding pipeline of a cold salt heat absorption system, the water side water feeding pipeline of the preheater-drain cooler 5 is respectively and positively connected to a low-pressure water feeding pipeline and a water feeding pipeline of a steam turbine high-pressure heater water feeding system, and the water side drain pipeline of the preheater-drain cooler 5 is reversely connected to a deaerator 8.
Therefore, when the 'water-molten salt-steam' inverse transformation heat device of the utility model reversely runs, molten salt from a hot salt tank to a cold salt tank releases heat, and deoxygenated feed water of a steam generation system is preheated, evaporated and superheated for plant use/industrial steam or main steam to run, at the same time, the flowing process of water in the 'water-molten salt-steam' inverse transformation heat device is a preheater-evaporator-superheater; when the water-molten salt-steam inverse heat transfer device of the utility model is operated in a forward direction, molten salt from a cold salt tank to a hot salt tank absorbs heat, and steam of a steam temperature-reducing, condensing and draining cooling system is subjected to temperature-reducing for plant use/industrial steam or steam is subjected to temperature-reducing, condensing and draining cooling and discharged to a deaerator to operate, at the same time, the flow process of the steam in the water-molten salt-steam inverse heat transfer device is a steam desuperheater-condenser-draining cooler.
In the above embodiment, preferably, the cold salt heat absorption system includes a cold salt tank 1, a cold salt pump 2, a cold salt pump salt feeding valve 18 and a cold salt tank salt returning valve 19, and the hot salt heat release system includes a hot salt tank 3, a hot salt pump 4, a hot salt pump salt feeding valve 24 and a hot salt tank salt returning valve 25.
Wherein, the cold salt of cold salt jar 1 gives the salt pipeline and divides into two routes: the first path is connected with a hot salt return pipeline of the hot salt tank 3 through a cold salt pump 2, a cold salt pump salt supply valve 18, a first cold salt isolation valve 20, a salt side pipeline of a preheater-drain cooler 5, a salt side pipeline of an evaporator-condenser 6, a salt side pipeline of a superheater-steam desuperheater 7, a first hot salt isolation valve 23 and a hot salt tank salt return valve 25; the second path is connected with a hot salt return pipeline of the hot salt tank 3 through a cold salt pump 2, a cold salt pump salt supply valve 18, a second cold salt isolation valve 21, a salt side pipeline of the superheater-steam desuperheater 7, a first hot salt isolation valve 23 and a hot salt tank salt return valve 25.
The hot salt supply pipeline of the hot salt tank 3 is divided into two paths: the first path is connected with a cold salt return pipeline of the cold salt tank 1 through a hot salt pump 4, a hot salt pump salt feeding valve 24, a first hot salt isolation valve 23, a salt side pipeline of a superheater-steam desuperheater 7, a second hot salt isolation valve 22, a salt side pipeline of an evaporator-condenser 6, a salt side pipeline of a preheater-drain cooler 5, a first cold salt isolation valve 20 and a cold salt tank salt return valve 19. The second path is connected with a cold salt return pipeline of the cold salt tank 1 through a hot salt pump 4, a hot salt pump salt supply valve 24, a first hot salt isolation valve 23, a superheater-steam desuperheater 7, a second cold salt isolation valve 21 and a cold salt tank salt return valve 19.
In the above embodiment, it is preferable that the boiler feed pump inlet valve 26, the boiler feed pump 9 and the turbine high-pressure heater feed system 11 are provided on the turbine high-pressure heater feed system feed line, and the water side feed line of the preheater-drain cooler 5 is connected to the turbine high-pressure heater feed system feed line through the high-pressure feed inlet valve 29.
In the above embodiment, preferably, the low-pressure water supply pump inlet valve 27, the low-pressure water supply pump 10 and the low-pressure water supply pump outlet valve 28 are installed in the water-side low-pressure water supply interface pipeline of the pre-heater hydrophobic cooler 5, and the water-side water supply pipeline of the pre-heater hydrophobic cooler 5 is connected with the low-pressure water supply pipeline through the low-pressure water supply pump outlet valve 28.
In the above embodiment, it is preferable that the drain line with the drain isolation valve 30 installed is connected to the existing deaerator 8 at the water side drain line interface of the preheater-drain cooler 5.
In the above embodiment, preferably, a steam temperature-reducing steam supply pipeline is arranged on the steam-side pipeline between the superheater-steam desuperheater 7 and the evaporator-condenser 6, and the steam temperature-reducing steam supply pipeline is connected to the plant/industrial steam pipeline 17 through a steam temperature-reducing plant/industrial steam isolation door 32, and is used for supplying heat after the steam extraction of the reheating section of the bypass turbine is subjected to temperature reduction and molten salt energy storage through the superheater-steam desuperheater 7.
In the above embodiment, it is preferable that the second hot salt isolation valve 22 is provided in the salt side pipe between the superheater-steam desuperheater 7 and the evaporator-condenser 6, the evaporator steam side outlet valve 31 is provided in the steam side pipe between the superheater-steam desuperheater 7 and the evaporator-condenser 6, and the high pressure bypass inlet stop valve 14 and the turbine high pressure bypass valve 15 are provided in the turbine high pressure bypass main steam inlet pipe.
In the above embodiment, preferably, the main steam isolation valve 33 is disposed on the main steam supply pipeline of the turbine, the plant/industrial steam isolation valve 34 is disposed on the plant/industrial steam supply pipeline, and the reheat section steam extraction pressure adjusting valve 35 and the reheat section steam extraction isolation valve 36 are disposed on the reheat section steam extraction pipeline of the bypass turbine.
When the inverse heat transfer device of water-molten salt-steam provided by the utility model is applied, the inverse heat transfer device comprises the following contents:
1) reverse application of the "water-molten salt-steam" reverse thermal conversion device:
1.1) the fused salt releases heat to supply a turbine to generate electricity:
(1) a hot salt tank-a cold salt tank, a molten salt heat release working medium flow:
a) checking a molten salt pipeline valve: the hot salt tank salt return valve 25 is closed, the cold salt pump salt supply valve 18 is closed, and the second cold salt isolation valve 21 is closed;
b) working medium flow of a hot salt tank and a cold salt tank: the method comprises the steps of heating a salt tank 3, heating a salt pump 4, opening a salt feeding valve 24 of the heating salt pump, opening a first heating salt isolation valve 23, opening a second heating salt isolation valve 22, opening a first cold salt isolation valve 20, opening a cold salt tank salt return valve 19 and returning cold salt to a cold salt tank 1.
(2) The process of water supply heat absorption-main steam supply working medium of the deaerator comprises the following steps:
a) steam-water pipeline valve inspection: the low-pressure water supply outlet valve 28 is closed, the drain isolation valve 30 is closed, the high-pressure bypass inlet stop valve 14 is closed, the steam temperature-reducing plant/industrial steam isolation door 32 and the fused salt heat-releasing plant/industrial steam isolation door 34 are closed, and the reheating hot section steam extraction isolation door 36 is closed;
b) the process of water supply heat absorption-main steam supply working medium of the deaerator comprises the following steps: the method comprises the steps of deaerator 8, boiler feed pump inlet valve 26 opening, boiler feed pump 9, turbine high-pressure heater water supply system 11, high-pressure feed water inlet valve 29 opening, preheater, evaporator steam side outlet valve 31 opening, superheater, main steam isolation valve 33 opening and turbine high-pressure cylinder 13-1.
1.2) steam for plant use/industrial steam is released by molten salt:
(1) a hot salt tank-a cold salt tank, a molten salt heat release working medium flow:
a) checking a molten salt pipeline valve: the hot salt tank salt return valve 25 is closed, the cold salt pump salt supply valve 18 is closed, and the second cold salt isolation valve 21 is closed;
b) working medium flow of a hot salt tank and a cold salt tank: the method comprises the steps of heating a salt tank 3, heating a salt pump 4, opening a salt feeding valve 24 of the heating salt pump, opening a first heating salt isolation valve 23, opening a second heating salt isolation valve 22, opening a first cold salt isolation valve 20, opening a cold salt tank salt return valve 19 and returning cold salt to a cold salt tank 1.
(2) The process of water supply and heat absorption of a deaerator-plant supply/industrial steam working medium comprises the following steps:
a) steam-water pipeline valve inspection: the high-pressure water supply inlet valve 29 is closed, the drain isolation valve 30 is closed, the steam temperature-reducing supply plant/industrial steam isolation door 32 is closed, the main steam isolation valve 33 is closed, and the reheating thermal section steam extraction isolation door 36 is closed;
b) a deaerator water supply-plant/industrial steam working medium flow: the method comprises the steps of deaerator 8, opening of an inlet valve 27 of a low-pressure water feed pump, opening of a low-pressure water feed pump 10, opening of a low-pressure water feed pump outlet valve 28, pre-heater, evaporator, opening of an outlet valve 31 on the steam side of the evaporator, superheater, opening of a fused salt heat release supply plant/industrial steam isolation door 34 and accessing of a plant/industrial steam system 17.
2) The reverse heat transfer device 'water-molten salt-steam' is applied in the forward direction:
2.1) heat supply working condition bypass steam turbine reheating heat section steam extraction temperature reduction heat supply-fused salt heat storage thermoelectric decoupling peak regulation:
(1) cold salt tank-hot salt tank, molten salt heat absorption working medium flow:
a) checking a molten salt pipeline valve: the cold salt tank salt return valve 19 is closed, the first cold salt isolation valve 20 is closed, the second hot salt isolation valve 22 is closed, and the hot salt pump salt supply valve 24 is closed;
b) working medium flow of a cold salt tank and a hot salt tank: the method comprises the steps of cooling salt tank 1, cooling salt pump 2, opening of a cooling salt pump salt supply valve 18, opening of a second cooling salt isolation valve 21, steam desuperheater, opening of a first hot salt isolation valve 23, opening of a hot salt tank salt return valve 25 and heat salt heat return to a salt tank 3.
(2) The process of reheating hot section steam extraction temperature reduction and heat release-supply/industrial steam working medium:
a) steam-water pipeline valve inspection: the main steam isolation valve 33 is closed, the main steam isolation valve 37 is closed, the fused salt heat release supply plant/industrial steam isolation valve 34 is closed, and the evaporator steam side outlet valve 31 is closed.
b) The process of reheating hot section steam extraction temperature reduction and heat release-supply/industrial steam working medium: the reheating hot section steam extraction isolation door 36 is opened, the reheating hot section steam extraction pressure regulating valve 35 is opened, the steam desuperheater is opened, the steam desuperheating plant/industrial steam isolation door 32 is opened, and the plant/industrial steam system 17 is connected.
2.2) steam extraction of a reheating hot section of a bypass turbine under a condensing condition-molten salt heat absorption:
(1) cold salt tank-hot salt tank, molten salt heat absorption working medium flow:
a) checking a molten salt pipeline valve: the cold salt tank salt return valve 19 is closed, the second cold salt isolation valve 21 is closed, and the hot salt pump salt supply valve 24 is closed;
b) working medium flow of a cold salt tank and a hot salt tank: the method comprises the steps of 1, 2, 18, 20, a first cold salt isolation valve, a drain cooler, a condenser, 22, a steam desuperheater, 23, 25, a hot salt return valve, and 3, wherein the cold salt tank is opened, the cold salt pump is opened, the cold salt supply valve is opened, the first cold salt isolation valve is opened, the drain cooler is opened, the second hot salt isolation valve is opened, the first hot salt isolation valve is opened, the hot salt tank return valve is opened, and the hot salt return valve is opened.
(2) The reheating hot section steam extraction heat release working medium flow comprises the following steps:
a) steam-water pipeline valve inspection: the main steam isolation valve 33 is closed, the main steam isolation valve 37 is closed, the steam temperature-reducing plant supply/industrial steam isolation door 32 is closed, the fused salt heat-releasing plant supply/industrial steam isolation door 34 is closed, the low-pressure water supply pump outlet valve 28 is closed, and the high-pressure water supply inlet valve 29 is closed;
b) the reheating section steam-condensed water hydrophobic working medium flow comprises the following steps: the method comprises the steps of opening a reheating thermal section steam-reheating thermal section steam extraction isolation door 36 of a boiler 12, opening a reheating thermal section steam extraction pressure regulating valve 35, opening a steam desuperheater, opening an evaporator steam side outlet valve 31, opening a condenser, a drain cooler, opening a drain isolation valve 30, and draining water to a deaerator 8.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention. For example: the molten salt energy storage and heat release is used for power generation of the steam turbine, equipment for increasing the temperature of main steam can be added according to the capacity of a molten salt energy storage and heat release system and the parameter requirements of main steam of the steam turbine, the connection point of a water supply system of the high-pressure heater can be adjusted according to the technical performance of molten salt, and the parameters of molten salt heat release and steam supply adjustment can also be used for replacing steam extraction of the high-pressure heater of the steam turbine, so that the water supply temperature of a boiler is increased, the steam extraction of the steam turbine is reduced, and the power generation efficiency of a unit is improved.
Claims (7)
1. The 'water-molten salt-steam' inverse heat conversion device is characterized by comprising a cold salt heat absorption system, a hot salt heat release system and a steam generation-steam temperature reduction, condensation and drainage cooling system;
the steam generation-steam temperature reduction, condensation and drainage cooling system comprises a superheater-steam desuperheater, an evaporator-condenser and a preheater-drainage cooler which are sequentially connected in series;
the salt side pipeline of the superheater-steam desuperheater is connected with a hot salt supply pipeline of the hot salt heat release system, the steam side pipeline of the superheater-steam desuperheater is respectively connected with a main steam supply pipeline of a steam turbine, a plant/industrial steam supply pipeline and a reheating heat section steam extraction pipeline of a bypass steam turbine, the main steam supply pipeline of the steam turbine is connected with a high-pressure bypass main steam inlet pipeline of the steam turbine and is merged into main steam supply of a high-pressure cylinder of the steam turbine, and the main steam supply pipeline of the steam turbine is used for releasing heat of the hot salt heat release system and supplying the steam turbine for power generation;
the plant/industrial steam supply pipeline is connected with the plant/industrial steam system, is used for supplying plant/industrial steam after heat release and oxygen removal water supply of the hot salt heat release system are preheated, evaporated and superheated, and is used for supplying plant or industrial steam and molten salt heat absorption energy storage after the reheated steam is desuperheated by the superheater-steam desuperheater;
the bypass steam turbine reheating thermal section steam pipeline is connected with reheating thermal section steam pipeline of the boiler and bypasses the reheating thermal section steam entering the steam turbine intermediate pressure cylinder, and the bypass steam turbine reheating thermal section steam pipeline is used for steam admission of the bypass steam turbine intermediate pressure cylinder under the deep peak regulation working condition and energy storage through heat absorption of molten salt;
the salt side pipeline of the preheater-drain cooler is connected with the cold salt feeding pipeline of the cold salt heat absorption system in a forward direction, the water side water feeding pipeline of the preheater-drain cooler is respectively connected to the low-pressure water feeding pipeline and the water feeding pipeline of the steam turbine high-pressure heater water feeding system in the forward direction, and the water side drain pipeline of the preheater-drain cooler is reversely connected to the deaerator.
2. The inverse heat exchanger water-molten salt-steam conversion device of claim 1, wherein the cold salt heat absorption system comprises a cold salt tank, a cold salt pump salt feeding valve and a hot salt tank salt returning valve, and the hot salt heat release system comprises a hot salt tank, a hot salt pump salt feeding valve and a cold salt tank salt returning valve;
wherein, the cold salt of cold salt jar gives the salt pipeline and divides into two routes: the first path is connected with a hot salt return pipeline of the hot salt tank through the cold salt pump, the cold salt pump salt supply valve, the first cold salt isolation valve, a salt side pipeline of the preheater-drain cooler, a salt side pipeline of the evaporator-condenser, a salt side pipeline of the superheater-steam desuperheater, the first hot salt isolation valve and the hot salt tank salt return valve; the second path is connected with a hot salt return pipeline of the hot salt tank through the cold salt pump, the cold salt pump salt supply valve, a second cold salt isolation valve, a salt side pipeline of the superheater-steam desuperheater, a first hot salt isolation valve and a hot salt tank salt return valve;
the hot salt supply pipeline of the hot salt tank is divided into two paths: the first path is connected with a cold salt return pipeline of the cold salt tank through the hot salt pump, a hot salt pump salt supply valve, a first hot salt isolation valve, a salt side pipeline of a superheater-steam desuperheater, a second hot salt isolation valve, a salt side pipeline of an evaporator-condenser, a salt side pipeline of a preheater-hydrophobic cooler, a first cold salt isolation valve and a cold salt tank salt return valve; the second path is connected with a cold salt return pipeline of the cold salt tank through the hot salt pump, the hot salt pump salt supply valve, the first hot salt isolation valve, the superheater-steam desuperheater, the second cold salt isolation valve and the cold salt tank salt return valve.
3. The inverse heat exchanger of water-molten salt-steam set forth in claim 2, wherein a boiler feed pump inlet valve, a boiler feed pump and a turbine high-pressure heater feed system are provided on the turbine high-pressure heater feed system feed line, and the water side feed line of the preheater-drain cooler is connected to the turbine high-pressure heater feed system feed line through the high-pressure feed inlet valve.
4. The inverse heat exchanger of water-molten salt-steam as claimed in claim 3, wherein a low pressure water feed pump inlet valve, a low pressure water feed pump and a low pressure water feed pump outlet valve are provided on the low pressure water feed pipeline, and a water side water feed pipeline of the pre-heater-drain cooler is connected with the low pressure water feed pipeline through the low pressure water feed pump outlet valve; and a water side drain pipeline of the preheater-drain cooler is connected with the deaerator through a drain isolation valve.
5. The inverse heat exchanger of water-molten salt-steam as claimed in claim 4, wherein a steam temperature-reducing steam supply pipeline is arranged on the steam-side pipeline between the superheater-steam desuperheater and the evaporator-condenser, and the steam temperature-reducing steam supply pipeline is connected to the plant/industrial steam pipeline through a plant/industrial steam isolation valve, and is used for supplying heat after the steam extraction of the reheating section of the bypass turbine is subjected to temperature reduction by the superheater-steam desuperheater and energy storage by the molten salt.
6. The inverse heat exchanger of water-molten salt-steam "as claimed in claim 5, wherein a second hot salt isolation valve is provided on the salt side pipeline between the superheater-steam desuperheater and the evaporator-condenser, an evaporator steam side outlet valve is provided on the steam side pipeline between the superheater-steam desuperheater and the evaporator-condenser, and a high pressure bypass inlet stop valve and a turbine high pressure bypass valve have been provided on the turbine high pressure bypass pipeline.
7. The inverse heat conversion device of water-molten salt-steam as claimed in claim 6, wherein a main steam isolation valve is disposed on the main steam supply pipeline of the turbine, a plant/industrial steam isolation valve is disposed on the plant/industrial steam supply pipeline, and a reheat section steam extraction pressure adjusting valve and a reheat section steam extraction isolation valve are disposed on the reheat section steam extraction pipeline of the bypass turbine.
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| CN202220605770.9U CN216894549U (en) | 2022-03-18 | 2022-03-18 | Inverse heat-exchanging device for' water-molten salt-steam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483216A (en) * | 2022-03-18 | 2022-05-13 | 吉林省众鑫能源服务有限公司 | Inverse heat transfer device for 'water-molten salt-steam' and application method thereof |
| CN116845933A (en) * | 2023-09-01 | 2023-10-03 | 山西中能天胜科技有限公司 | Power distribution system based on steam heat exchange coupling electrode heating fused salt |
-
2022
- 2022-03-18 CN CN202220605770.9U patent/CN216894549U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483216A (en) * | 2022-03-18 | 2022-05-13 | 吉林省众鑫能源服务有限公司 | Inverse heat transfer device for 'water-molten salt-steam' and application method thereof |
| CN116845933A (en) * | 2023-09-01 | 2023-10-03 | 山西中能天胜科技有限公司 | Power distribution system based on steam heat exchange coupling electrode heating fused salt |
| CN116845933B (en) * | 2023-09-01 | 2023-11-28 | 山西中能天胜科技有限公司 | Power distribution system based on steam heat exchange coupling electrode heating fused salt |
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