CN111928323A

CN111928323A - Coal-to-electricity central heating system with electric boiler combined with energy storage tank for heat storage

Info

Publication number: CN111928323A
Application number: CN202010432804.4A
Authority: CN
Inventors: 刘宇阳; 苗强; 王景富; 于海涛; 陈玉翔; 高剑; 杨海彬; 王钢; 刘晓宇; 顾阳
Original assignee: 703th Research Institute of CSIC
Current assignee: 703th Research Institute of CSIC
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2020-11-13

Abstract

The invention discloses a coal-to-electricity centralized heating system with an electric boiler combined with an energy storage tank for heat storage, which belongs to the technical field of heat supply and aims to solve the problem that no large-scale electric energy heating station can perform electric energy heating equipment in the environment of changing urban heat supply coal into electricity, and comprises an electric boiler heating mechanism, a heat exchange mechanism, a heat network circulation mechanism, a heat storage trunk road and an energy storage tank, the output end of the electric boiler heating mechanism is connected with the heat storage main line through the heat exchange mechanism, the heat source input end of the heat network circulation mechanism is connected with the heat storage main line, the heat source output end of the heat network circulation mechanism is connected with the heat supply unit, the heat input end of the heat storage mechanism is connected with the heat storage main line, the heat output end of the heat storage mechanism is connected with the heat network circulation mechanism, and the heat storage end of the heat storage mechanism is connected with the energy storage tank.

Description

Coal-to-electricity central heating system with electric boiler combined with energy storage tank for heat storage

Technical Field

The invention belongs to the technical field of heat supply, and particularly relates to a coal-to-electricity central heating system with an electric boiler combined with an energy storage tank for heat storage.

Background

Along with the continuous development of society, people pay more and more attention to environmental protection and sustainable development, each field also contributes to the effort of the people, in order to ensure the improvement of the overall level of the environment, the development of urban heat supply infrastructure is required to be synchronous with urban construction, the economy is prosperous, simultaneously, a living environment with beautiful environment and comfortable life is created, in order to meet the requirements of energy conservation and environmental protection, a coal-fired boiler is forbidden to be newly built, meanwhile, the existing low-efficiency coal-fired boiler is about to be dismantled, the town heat supply coal is urgently needed to be changed into electricity, and an electric energy heat supply station is started. The range of changing town heat supply coal into electricity comprises an electric energy heat supply station reconstructed by dismantling a low-efficiency coal-fired boiler, a newly-built distributed electric energy heat supply station and electric energy heating equipment reconstructed by a single-family heating coal-fired stove, and no large-scale electric energy heat supply station can meet the requirement at present in China.

Therefore, the development of the town heat supply coal-to-electricity centralized heating system with the combination of the electric boiler and the energy storage tank for heat storage is very practical for filling the blank of China in the field of large-scale electric energy heating stations.

Disclosure of Invention

The invention aims to solve the problem that no large-scale electric heating station can perform electric heating equipment in the environment of changing urban heat supply coal into electricity, and further provides a centralized heating system for changing the urban heat supply coal into electricity, which stores heat by combining an electric boiler with an energy storage tank;

a coal-to-electricity centralized heating system with an electric boiler combined with an energy storage tank for heat storage comprises an electric boiler heating mechanism, a heat exchange mechanism, a heat supply network circulation mechanism, a heat storage mechanism, a cold side heat exchange main road and an energy storage tank, wherein the output end of the electric boiler heating mechanism is connected with the cold side heat exchange main road through the heat exchange mechanism, the heat source input end of the heat supply network circulation mechanism is connected with the cold side heat exchange main road, the heat source output end of the heat supply network circulation mechanism is connected with a heat supply unit, the heat input end of the heat storage mechanism is connected with the cold side heat exchange main road, the heat output end of the heat storage mechanism is connected with the heat supply network circulation mechanism, and the heat storage end of the heat storage;

the cold-side heat exchange main trunk circuit comprises a cold-side heat exchange high-temperature water path and a cold-side heat exchange low-temperature water path;

furthermore, the electric boiler heating mechanism comprises a plurality of electric boiler assemblies, each electric boiler assembly comprises an electric boiler, a hot water output pipeline and a cold water return pipeline, one end of the hot water output pipeline is communicated with the electric boiler, the other end of the hot water output pipeline is connected with an inlet of a heat energy input pipeline in the heat exchange mechanism, one end of the cold water return pipeline is communicated with the electric boiler, and the other end of the cold water return pipeline is connected with an outlet of the heat energy input pipeline in the heat exchange mechanism;

furthermore, the heat exchange mechanism comprises a plurality of plate heat exchanger components, each plate heat exchanger component is arranged corresponding to one electric boiler component, each plate heat exchanger component comprises a plate heat exchanger, a heat exchange water output pipeline and a heat exchange water input pipeline, the other end of the hot water output pipeline in each electric boiler component is connected with the inlet of the heat energy input pipeline in one plate heat exchanger, the other end of the cold water return pipeline in each electric boiler component is connected with the outlet of the heat energy input pipeline in one plate heat exchanger, one end of each heat exchange water input pipeline is connected with the inlet of the heat energy output pipeline in the plate heat exchanger, the other end of the heat exchange water input pipeline is connected with the cold-side low-temperature water channel in the cold-side heat exchange main circuit, one end of each heat exchange water output pipeline is connected with the outlet of the heat energy output pipeline in the plate heat exchanger, and the other end of each heat exchange water output pipeline is connected with the cold-side high-temperature water channel in the cold-side heat exchange main circuit, an electric gate valve d1 is connected in series on each heat exchange water input pipeline, an electric gate valve d2 is connected in series on each heat exchange water output pipeline, a branch is arranged between each heat exchange water output pipeline and each heat exchange water input pipeline, and a stop valve e1 is connected in series on the branch;

further, the heat supply network circulating mechanism comprises a heat supply network water supply main line and a heat supply network water return main line;

one end of the heat supply network water supply main road is communicated with the cold side heat exchange high-temperature water path, the other end of the heat supply network water supply main road is communicated with a hot water pipe in the heat supply unit, an electric butterfly valve a1 is arranged on the heat supply network water supply main road at a position close to the communication between the heat supply network water supply main road and the cold side heat exchange high-temperature water path, and an electric butterfly valve a2 and a flow measuring device c1 are sequentially arranged on the heat supply network water supply main road at a position close to the communication between the heat supply network water supply main road and the;

one end of the heat supply network backwater main line is communicated with the cold side heat exchange low-temperature water path, the other end of the heat supply network backwater main line is communicated with a cold water pipe in the heat supply unit, an electric butterfly valve a3 and a heat supply network circulating pump set are arranged on the heat supply network backwater main line close to the communication position of the heat supply network backwater main line and the cold side heat exchange high-temperature water path, and an electric butterfly valve a4, a flow measuring device c2, a water filter L1 and an electric gate valve d8 are sequentially arranged on the heat supply network backwater main line close to the communication position of the heat supply network backwater main line;

an electric butterfly valve a5 is connected in series between the water filter L1 and the flow measuring device c2, an electric butterfly valve a6 is connected in series between the water filter L1 and the heat supply network circulating pump group, and an electric butterfly valve a7 is connected in parallel to the water filter L1, the electric butterfly valve a5 and the electric butterfly valve a 6;

the heat supply network circulation pump group comprises four heat supply network pumps which are mutually connected in parallel, two ends of each heat supply network pump are respectively connected with an electric butterfly valve a8 and an electric butterfly valve a9 in series, each heat supply network pump is connected with an electric butterfly valve a9 in series to form a check valve b1, the electric butterfly valve a8 is adjacent to a water filter L1, the electric butterfly valve a9 is adjacent to the electric butterfly valve a3, two ends of the heat supply network circulation pump group are connected with the check valves b2 in parallel, and two ends of the heat supply network circulation pump group are connected with a safety valve f1 in parallel;

the water inlet of the heat supply network pump is also connected with a heat supply network water replenishing pipe, and the heat supply network water replenishing pipe is arranged close to the electric butterfly valve a 8;

a communicating branch is arranged between one end of the heat supply network backwater main circuit close to the cold side heat exchange main circuit and one end of the heat supply network water supply main circuit close to the cold side heat exchange main circuit, and an electric butterfly valve a10 is arranged on the communicating branch;

a communicating branch is arranged between one end of the heat supply network water return main road close to the heat supply unit and one end of the heat supply network water supply main road close to the heat supply unit, and an electric butterfly valve a11 is arranged on the communicating branch;

further, the heat storage mechanism comprises a heat storage high-temperature water inlet waterway, a heat storage low-temperature water outlet waterway, a heat release high-temperature water outlet waterway, a heat release low-temperature water inlet waterway, a high-temperature water interface passage and a low-temperature water interface passage;

the heat-storage high-temperature water inlet waterway is sequentially connected with an electric butterfly valve a12, a regulating valve a13, an electric butterfly valve a14 and a check valve b3 in series from a water inlet end to a water outlet end, and the electric butterfly valve a15 is connected with an electric butterfly valve a12, an electric butterfly valve a13 and an electric butterfly valve a14 in parallel; the water inlet end of the heat-storage high-temperature water inlet waterway is communicated with the cold-side heat-exchange high-temperature waterway, and the water outlet end of the heat-storage high-temperature water inlet waterway is communicated with one end of the high-temperature water interface passage;

the heat release high-temperature water outlet waterway is sequentially connected in series with an electric butterfly valve a15, a check valve b4 and an electric gate valve d3 from the water inlet end to the water outlet end, the water inlet end of the heat release high-temperature water outlet waterway is communicated with one end of a high-temperature water interface passage, the water outlet end of the heat release high-temperature water outlet waterway is communicated with a heat supply network water return trunk passage,

the heat-releasing low-temperature water inlet waterway is sequentially connected with an electric gate valve d4, an electric butterfly valve a16, a heat storage pump set, an electric butterfly valve a17, an electric butterfly valve a18, an electric butterfly valve a19 and a check valve b5 in series from a water inlet end to a water outlet end, the electric butterfly valve 20 is connected with an electric butterfly valve a17, a regulating valve a18 and an electric butterfly valve a19 in parallel, a branch is arranged between the water outlet end of the heat-releasing low-temperature water inlet waterway and a water inlet of the heat storage pump set, a check valve b6 and an electric butterfly valve a21 are sequentially connected in series between the water inlet and the water outlet of the branch, the water inlet end of the heat-releasing low-temperature water inlet waterway is communicated with a heat supply network water;

the heat-storage low-temperature water outlet waterway is sequentially connected with an electric butterfly valve a22 and a check valve b7 in series from a water inlet end to a water outlet end, the water inlet end of the heat-storage low-temperature water outlet waterway is communicated with a water outlet of a heat-storage pump set, and a cold-side heat exchange low-temperature waterway at the water outlet end of the heat-storage low-temperature water outlet waterway is communicated;

the high-temperature water interface passage is sequentially connected with an electric butterfly valve 23, a flow measuring device c3 and an electric gate valve d5 in series from one end to the other end, one end of the high-temperature water interface passage is communicated with the water outlet end of the heat storage high-temperature water inlet waterway and the water inlet end of the heat release high-temperature water outlet waterway, and the other end of the high-temperature water interface passage is communicated with the high-temperature water interface of the heat storage tank;

the low-temperature water interface passage is sequentially connected with a flow measuring device c4 and an electric gate valve d6 in series from one end to the other end; one end of the high-temperature water interface passage is communicated with the outlet end of the heat-releasing low-temperature water inlet waterway, and the other end of the low-temperature water interface passage is communicated with the low-temperature water interface of the heat storage tank;

a branch is arranged between one end of the heat release low-temperature water inlet waterway, which is close to the heat supply network circulating mechanism, and one end of the heat release high-temperature water outlet waterway, which is close to the heat supply network circulating mechanism, and the branch is sequentially connected with an electric gate valve d7 and a check valve b8 in series from a water inlet end to a water outlet end;

the heat storage pump set comprises two heat storage pumps, wherein two ends of each heat storage pump are respectively connected with an electric butterfly valve a24 and an electric butterfly valve a25 in series, a check valve b9 is connected between each heat storage pump and the electric butterfly valve a25 in series, and two ends of each heat storage pump set are connected with a check valve b10 in parallel;

furthermore, the electric boiler assembly also comprises a chemical water supplementing pipeline and a chemical dosing pipeline, one end of the hot water output pipeline is communicated with the electric boiler, the other end of the hot water output pipeline is connected with an inlet of the heat energy input pipeline in the heat exchange mechanism, one end of the cold water return pipeline is communicated with the electric boiler, and the other end of the cold water return pipeline is connected with an outlet of the heat energy input pipeline in the heat exchange mechanism;

the hot water output pipeline is sequentially connected with a stop valve e2, a stop valve e3, a three-way electric gate valve g1, a stop valve e4 and a stop valve e6 in series from the output end to the input end, and the stop valve e5 is connected with the stop valve e3, the three-way electric gate valve g1 and the stop valve e4 in parallel;

the cold water return pipeline is sequentially connected with a stop valve e7, a stop valve e8, a circulating pump, a stop valve e9 and a stop valve e10 in series from the output end to the input end, a check valve b11 is connected between the circulating pump and the stop valve e9 in series, and a check valve b12 is connected between the stop valve e10 and the input end of the electric boiler in series;

the input end of the chemical water replenishing pipeline is connected with the chemical water replenishing device, the output end of the chemical water replenishing pipeline is connected into the constant pressure branch through a stop valve e11, and the connection position is located between the stop valve e12 and the stop valve e13 on the constant pressure branch; one end of the constant pressure branch is communicated with a cold water return pipeline through a cooling tank, and the connection position is positioned between a stop valve e7 and a stop valve e 8; the other end of the constant pressure branch is communicated with the buffer tank through a stop valve e 13;

a stop valve e14 is connected in series on the chemical dosing pipeline, one end of the chemical dosing pipeline is connected with the chemical dosing device, the other end of the chemical dosing pipeline is arranged between the constant pressure branch pipeline and the stop valve e7, and the other end of the chemical dosing pipeline is communicated with the cold water return pipeline;

a branch is arranged between the hot water output pipeline and the cold water return pipeline, and a stop valve e15 is connected in series on the branch;

further, the heat storage mechanism is a header pipe heat storage mechanism;

the heat storage mechanism comprises a plurality of sub-devices and a main pipe trunk, wherein the main pipe trunk comprises a heat release high-temperature water outlet trunk and a heat release low-temperature water inlet trunk;

each sub-device comprises a heat storage high-temperature water inlet waterway, a heat release high-temperature water outlet branch, a heat release low-temperature water inlet branch, a high-temperature water interface passage and a low-temperature water interface passage;

the heat-storage high-temperature water inlet water channel is sequentially connected with an electric butterfly valve a12, a regulating valve a13, an electric butterfly valve a14 and a check valve b3 in series from a water inlet end to a water outlet end, and the electric butterfly valve a15 is connected with an electric butterfly valve a12, an electric butterfly valve a13 and an electric butterfly valve a14 in parallel; the water inlet end of the heat-storage high-temperature water inlet waterway is communicated with the cold-side heat-exchange high-temperature waterway, and the water outlet end of the heat-storage high-temperature water inlet waterway is communicated with one end of the high-temperature water interface passage;

the heat-releasing high-temperature water outlet branch is sequentially connected with an electric butterfly valve a15 and a check valve b4 in series from a water inlet end to a water outlet end, the water inlet end of the heat-releasing high-temperature water outlet waterway is communicated with one end of the high-temperature water interface passage, and the water outlet end of the heat-releasing high-temperature water outlet waterway is communicated with the heat-releasing high-temperature water outlet trunk passage in the main pipe trunk passage;

the heat-releasing low-temperature water inlet branch is sequentially connected with an electric butterfly valve a17, an electric butterfly valve a18, an electric butterfly valve a19 and a check valve b5 in series from a water inlet end to a water outlet end, the electric butterfly valve 20 is connected with the electric butterfly valve a17, a regulating valve a18 and an electric butterfly valve a19 in parallel, the water inlet end of the heat-releasing low-temperature water inlet water channel is communicated with a heat-releasing low-temperature water inlet main channel in the main pipe trunk, and the water outlet end of the heat-releasing low-temperature water inlet branch is communicated with one end of a low;

the high-temperature water interface passage is sequentially connected with an electric butterfly valve 23, a flow measuring device c3 and an electric gate valve d5 in series from one end to the other end, one end of the high-temperature water interface passage is communicated with the water outlet end of the heat storage high-temperature water inlet waterway and the water inlet end of the heat release high-temperature water outlet waterway, and the other end of the high-temperature water interface passage is communicated with the high-temperature water interface of a heat storage tank;

the low-temperature water interface passage is sequentially connected with a flow measuring device c4 and an electric gate valve d6 in series from one end to the other end; one end of the high-temperature water interface passage is communicated with the outlet end of the heat-releasing low-temperature water inlet waterway, and the other end of the low-temperature water interface passage is communicated with a low-temperature water interface of a heat storage tank;

an electric gate valve d3 is connected in series at the position, close to the water outlet end, of the heat release high-temperature water outlet main road, and the water outlet end of the heat release high-temperature water outlet main road is communicated with the heat supply network water return main road;

the heat release low-temperature water inlet trunk is sequentially connected with an electric gate valve d4, an electric butterfly valve a16 and a heat storage pump set in series from a water inlet end to a water outlet end, a water outlet of the heat storage pump set is connected with a heat storage low-temperature water outlet waterway, the heat storage low-temperature water outlet waterway is sequentially connected with an electric butterfly valve a22 and a check valve b7 in series from the water inlet end to the water outlet end, the water inlet end of the heat storage low-temperature water outlet waterway is communicated with the water outlet of the heat storage pump set, and a cold side heat exchange low-temperature waterway at the water;

the heat storage pump set comprises four heat storage pumps, two ends of each heat storage pump are respectively connected with an electric butterfly valve a24 and an electric butterfly valve a25 in series, a check valve b9 is connected between the heat storage pump and the electric butterfly valve a25 in series, and two ends of the heat storage pump set are connected with a check valve b10 in parallel;

the outlet end of each heat release low-temperature water inlet branch is communicated with the water inlet of the heat storage pump set through a check valve b6 and an electric butterfly valve a21 in sequence;

further, the heat storage mechanism is a unit heat storage mechanism;

the heat storage mechanism comprises a plurality of heat storage units, a heat release high-temperature water outlet passage (15) and a heat release low-temperature water inlet passage;

each heat storage unit comprises a heat storage high-temperature water inlet waterway, a heat release high-temperature water outlet branch, a heat release low-temperature water inlet branch, a high-temperature water interface passage and a low-temperature water interface passage;

the heat-releasing low-temperature water inlet branch is sequentially connected with an electric butterfly valve a16, a heat-storing pump set, an electric butterfly valve a17, an electric butterfly valve a18, an electric butterfly valve a19 and a check valve b5 in series from a water inlet end to a water outlet end, the electric butterfly valve 20 is connected with the electric butterfly valve a17, an adjusting valve a18 and the electric butterfly valve a19 in parallel, a branch is arranged between the water outlet end of the heat-releasing low-temperature water inlet water channel and a water inlet of the heat-storing pump set, the branch is sequentially connected with a check valve b6 and an electric butterfly valve a21 in series from the water inlet to the water outlet, the water inlet end of the heat-releasing low-temperature water inlet water channel is communicated with the heat;

the heat storage pump set comprises two heat storage pumps, wherein two ends of each heat storage pump are respectively connected with an electric butterfly valve a24 and an electric butterfly valve a25 in series, a check valve b9 is connected between each heat storage pump and the electric butterfly valve a25 in series, and two ends of the heat storage pump set are connected with a check valve b10 in parallel;

the heat storage low-temperature water outlet waterway is sequentially connected with an electric butterfly valve a22 and a check valve b7 in series from the water inlet end to the water outlet end, the water inlet end of the heat storage low-temperature water outlet waterway is communicated with the water outlet of the heat storage pump set, and the cold side heat exchange low-temperature waterway at the water outlet end of the heat storage low-temperature water outlet waterway is communicated;

the low-temperature water interface passage is sequentially connected with a flow measuring device c4 and an electric gate valve d6 in series from one end to the other end; one end of the high-temperature water interface passage is communicated with the outlet end of the heat-releasing low-temperature water inlet waterway (8), and the other end of the low-temperature water interface passage is communicated with the low-temperature water interface of a heat storage tank;

an electric gate valve d3 is connected in series at the position, close to the water outlet, of the heat release high-temperature water outlet passage, and the water outlet end of the heat release high-temperature water outlet passage is communicated with the heat supply network water return main passage;

the water inlet end of the heat release low-temperature water inlet passage, which is close to the water inlet end, is connected in series with an electric gate valve d4, and the water inlet end of the heat release high-temperature water outlet passage is communicated with the heat supply network water return main passage;

the tail end of the heat release high-temperature water outlet passage is connected with the tail end of the heat release low-temperature water inlet passage through a branch, a check valve b13 is connected in series on the branch, and the tail end of the heat release low-temperature water inlet passage is connected with an electric gate valve d11 in series;

furthermore, an electric boiler heating mechanism in the heating system is divided into an electric boiler heating direct supply mechanism and an electric boiler heating heat storage mechanism, a cold side heat exchange main circuit is divided into a cold side heat exchange direct supply main circuit and a cold side heat exchange main circuit, a heat exchange mechanism is divided into a heat exchange direct supply mechanism and a heat exchange heat storage mechanism, the electric boiler heating direct supply mechanism is connected with the cold side heat exchange direct supply main circuit through the heat exchange direct supply mechanism, the electric boiler heating heat storage mechanism is connected with the cold side heat exchange main circuit through the heat exchange heat storage mechanism, a heat exchange water input pipeline in one plate type heat exchanger component of the heat exchange direct supply mechanism is connected with a heat exchange water input pipeline in one plate type heat exchanger component of the heat exchange heat storage mechanism through a pipeline, an electric gate valve d9 is connected in series on the pipeline, a heat exchange water output pipeline in one plate type heat exchanger component of the heat exchange direct supply mechanism is connected with a heat exchange water delivery pipeline in one plate type heat exchanger component, the pipeline is connected with an electric gate valve d10 in series;

compared with the prior art, the invention has the following beneficial effects:

the invention provides a coal-to-electricity centralized heating system with an electric boiler combined with an energy storage tank for heat storage, which fills the blank of China in the field of large-scale electric energy heating stations. Meanwhile, the method plays a role in improving and promoting the balance of a power grid, expanding clean heat supply, saving resources, reducing pollutant discharge, improving the environmental quality and the life quality of residents, has remarkable social, economic and environmental benefits, and is very necessary for the sustainable development of cities and towns.

The invention provides a town heat supply coal-to-electricity centralized heating system with an electric boiler combined with an energy storage tank for heat storage, which is divided into three parts, namely heat supply of the electric boiler, the energy storage tank and heat network circulation. The electric boiler runs at night, the energy storage tank and the heat supply network are circulated all day long, the electric boiler utilizes off-peak power to heat primary circulating water at night, indirect heat exchange is carried out between the electric boiler and the heat supply network through a plate heat exchanger, and the heat supply network after heat exchange is circulated to supply heat for users; meanwhile, the electric boiler stores heat required by the heat supply network when the power peak circulates in the energy storage tank through indirect heat exchange of the plate heat exchanger. The energy storage tank circularly releases the stored heat to the heat supply network when the power peak, the system can utilize the valley power to heat the user, simultaneously, the energy storage is carried out when the valley power, the stored energy is utilized to circularly release the heat supply network to heat the user when the power peak, and the 24-hour heating is effectively realized through the conversion between the heat storage and the heat release, thereby further ensuring the economical efficiency of the heating system.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention;

FIG. 2 is a schematic diagram of the structure of the heating element of the electric boiler of the system of the present invention;

FIG. 3 is a schematic diagram of the heat exchange assembly of the system of the present invention;

FIG. 4 is a schematic diagram of the heat supply network circulation mechanism of the system of the present invention;

FIG. 5 is a schematic diagram of the structure of the energy storage mechanism in the system of the present invention;

FIG. 6 is a schematic structural view of a water replenishing device added to an electric boiler heating mechanism in the system of the present invention;

FIG. 7 is a schematic structural view of a header energy storage mechanism in the system of the present invention;

FIG. 8 is a schematic diagram of a modular energy storage mechanism in the system of the present invention;

FIG. 9 is a schematic diagram of the overall structure of a header energy storage mechanism utilized in the system of the present invention (the electric boiler heating direct supply mechanism is in communication with the cold side of the electric boiler heat exchange and storage mechanism);

FIG. 10 is a schematic diagram of the overall structure of the energy storage mechanism utilizing a header system in the system of the present invention (the heating direct supply mechanism of the electric boiler is separated from the cold side of the heat exchange and storage mechanism of the electric boiler);

FIG. 11 is a schematic view of the overall structure of the energy storage mechanism using a unit system in the system of the present invention;

Detailed Description

The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 5, and provides a centralized heating system for converting town heating coal into electricity, wherein an electric boiler is combined with an energy storage tank for storing heat;

the heating system comprises an electric boiler heating mechanism, a heat exchange mechanism, a heat supply network circulation mechanism, a heat storage mechanism, a cold side heat exchange main road and an energy storage tank, wherein the output end of the electric boiler heating mechanism is connected with the cold side heat exchange main road through the heat exchange mechanism, the heat source input end of the heat supply network circulation mechanism is connected with the cold side heat exchange main road, the heat source output end of the heat supply network circulation mechanism is connected with a heat supply unit, the heat input end of the heat storage mechanism is connected with the cold side heat exchange main road, the heat output end of the heat storage mechanism is connected with the heat supply network circulation mechanism, and the heat storage end of the heat storage mechanism is connected;

the cold-side heat exchange main trunk circuit comprises a cold-side heat exchange high-temperature water path 1 and a cold-side heat exchange low-temperature water path 2;

the electric boiler heating mechanism comprises a plurality of electric boiler assemblies, each electric boiler assembly comprises an electric boiler, a hot water output pipeline and a cold water return pipeline, one end of each hot water output pipeline is communicated with the electric boiler, the other end of each hot water output pipeline is connected with an inlet of a heat energy input pipeline in the heat exchange mechanism, one end of each cold water return pipeline is communicated with the electric boiler, and the other end of each cold water return pipeline is connected with an outlet of the heat energy input pipeline in the heat exchange mechanism;

the heat exchange mechanism comprises a plurality of plate type heat exchanger components, each plate type heat exchanger component is arranged corresponding to one electric boiler component, each plate type heat exchanger component comprises a plate type heat exchanger, a heat exchange water output pipeline and a heat exchange water input pipeline, the other end of a hot water output pipeline in each electric boiler component is connected with an inlet of a heat energy input pipeline in one plate type heat exchanger, the other end of a cold water return pipeline in each electric boiler component is connected with an outlet of the heat energy input pipeline in one plate type heat exchanger, one end of each heat exchange water input pipeline is connected with an inlet of the heat energy output pipeline in the plate type heat exchanger, the other end of the heat exchange water input pipeline is connected with a cold side heat exchange low-temperature water channel 2 in a cold side heat exchange main circuit, one end of each heat exchange water output pipeline is connected with an outlet of the heat energy output pipeline in the plate type heat exchanger, and the other end of each heat exchange water output pipeline is connected with a heat exchange water channel high-temperature 1, an electric gate valve d1 is connected in series on each heat exchange water input pipeline, an electric gate valve d2 is connected in series on each heat exchange water output pipeline, a branch is arranged between each heat exchange water output pipeline and each heat exchange water input pipeline, and a stop valve e1 is connected in series on the branch;

the heat supply network circulating mechanism comprises a heat supply network water supply main line 3 and a heat supply network water return main line 4;

one end of the heat supply network water supply main road is communicated with the cold side heat exchange high-temperature water path 1, the other end of the heat supply network water supply main road is communicated with the heat supply unit, an electric butterfly valve a1 is arranged on the heat supply network water supply main road at a position close to the communication position of the heat supply network water supply main road and the cold side heat exchange high-temperature water path 1, and an electric butterfly valve a2 and a flow measuring device c1 are sequentially arranged on the heat supply network water supply main road at a position close to the communication position of the heat supply network water supply main road and;

one end of the heat supply network backwater main road is communicated with the cold side heat exchange low-temperature waterway 2, the other end of the heat supply network backwater main road is communicated with the heat supply unit, an electric butterfly valve a3 and a heat supply network circulating pump set are arranged on the heat supply network backwater main road close to the communication position of the heat supply network backwater main road and the cold side heat exchange high-temperature waterway 1, and an electric butterfly valve a4, a flow measuring device c2, a water filter L1 and an electric gate valve d8 are sequentially arranged on the heat supply network backwater main road close to the communication position of the heat supply network backwater main road and the heat;

the heat storage mechanism comprises a heat storage high-temperature water inlet waterway 5, a heat storage low-temperature water outlet waterway 6, a heat release high-temperature water outlet waterway 7, a heat release low-temperature water inlet waterway 8, a high-temperature water interface passage 9 and a low-temperature water interface passage 10;

the heat-storage high-temperature water inlet water channel 5 is sequentially connected with an electric butterfly valve a12, a regulating valve a13, an electric butterfly valve a14 and a check valve b3 in series from a water inlet end to a water outlet end, and the electric butterfly valve a15 is connected with an electric butterfly valve a12, an electric butterfly valve a13 and an electric butterfly valve a14 in parallel; the water inlet end of the heat-storage high-temperature water inlet waterway 5 is communicated with the cold-side heat-exchange high-temperature waterway 1, and the water outlet end of the heat-storage high-temperature water inlet waterway 5 is communicated with one end of the high-temperature water interface passage 9;

the heat release high-temperature water outlet waterway 7 is sequentially connected in series with an electric butterfly valve a15, a check valve b4 and an electric gate valve d3 from the water inlet end to the water outlet end, the water inlet end of the heat release high-temperature water outlet waterway 7 is communicated with one end of a high-temperature water interface passage 9, the water outlet end of the heat release high-temperature water outlet waterway 7 is communicated with a heat supply network water return trunk,

the heat-releasing low-temperature water inlet waterway 8 is sequentially connected with an electric gate valve d4, an electric butterfly valve a16, a heat storage pump set, an electric butterfly valve a17, an electric butterfly valve a18, an electric butterfly valve a19 and a check valve b5 in series from a water inlet end to a water outlet end, the electric butterfly valve 20 is connected with an electric butterfly valve a17, a regulating valve a18 and an electric butterfly valve a19 in parallel, a branch is arranged between the water outlet end of the heat-releasing low-temperature water inlet waterway 8 and a water inlet of the heat storage pump set, a check valve b6 and an electric butterfly valve a21 are sequentially connected in series between the water inlet and the water outlet of the branch, the water inlet end of the heat-releasing low-temperature water inlet waterway 8 is communicated with a heat supply network water return;

the heat storage low-temperature water outlet waterway 6 is sequentially connected with an electric butterfly valve a22 and a check valve b7 in series from a water inlet end to a water outlet end, the water inlet end of the heat storage low-temperature water outlet waterway is communicated with a water outlet of a heat storage pump set, and a cold side heat exchange low-temperature waterway 2 at the water outlet end of the heat storage low-temperature water outlet waterway is communicated with the water outlet end of the heat storage low-temperature water outlet;

the high-temperature water interface passage 9 is sequentially connected with an electric butterfly valve 23, a flow measuring device c3 and an electric gate valve d5 in series from one end to the other end, one end of the high-temperature water interface passage 9 is communicated with the water outlet end of the heat storage high-temperature water inlet water path 5 and the water inlet end of the heat release high-temperature water outlet water path 7, and the other end of the high-temperature water interface passage 9 is communicated with the high-temperature water interface of the heat storage tank;

the low-temperature water interface passage 10 is sequentially connected with a flow measuring device c4 and an electric gate valve d6 in series from one end to the other end; one end of the high-temperature water interface passage 9 is communicated with the outlet end of the heat-releasing low-temperature water inlet waterway 8, and the other end of the low-temperature water interface passage 10 is communicated with the low-temperature water interface of the heat storage tank;

a branch is arranged between one end of the heat release low-temperature water inlet waterway 8 close to the heat supply network circulating mechanism and one end of the heat release high-temperature water outlet waterway 7 close to the heat supply network circulating mechanism, and the branch is sequentially connected with an electric gate valve d7 and a check valve b8 in series from a water inlet end to a water outlet end;

the heat storage pump set comprises two heat storage pumps, wherein two ends of each heat storage pump are respectively connected with an electric butterfly valve a24 and an electric butterfly valve a25 in series, a check valve b9 is connected between each heat storage pump and the electric butterfly valve a25 in series, and two ends of each heat storage pump set are connected with a check valve b10 in parallel.

In this embodiment, a coal-to-electricity centralized heating system with an electric boiler combined with an energy storage tank for heat storage is provided, and when an actual project is implemented, the number of the electric boiler, a heat supply network circulating pump, a heat storage pump and the energy storage tank in the system needs to be adjusted according to actual conditions of the project. Meanwhile, the electric boiler can adopt the forms of a resistance-type electric boiler, a high-voltage electrode boiler, a solid heat storage electric boiler and the like, the energy storage part can also be replaced by other heat storage forms such as pressure-bearing water heat storage, phase change heat storage, solid heat storage and the like, and for different heat storage modes, heat exchangers and the like are correspondingly required to be added so as to extract the stored heat.

The heating system provided by the embodiment is a basic form, and in the process of practical application, the heating system can be further improved into a main pipe system and a unit system according to different heating ranges.

The basic operating principle of the present embodiment is as follows:

the electric boiler heating mechanism is used for generating heat, the heat is transferred to a cold side heat exchange high-temperature water pipe in a cold side heat exchange main line through the heat exchange mechanism, the cold side heat exchange high-temperature water pipe can convey hot water with high temperature to the heat supply network circulation mechanism for heating the heat supply unit, the cold side heat exchange high-temperature water pipe can convey the hot water with high temperature to the heat storage mechanism at the same time for storing the heat, the water with the heat can be stored in the energy storage tank and is conveyed to the heat network circulation mechanism through the heat storage mechanism at the power peak value for slowing down the power load at the power consumption peak, the low-temperature water returned by the heat network circulation mechanism after heating can return to the cold side heat exchange low-temperature water pipe in the cold side heat exchange main line for further heat exchange, and meanwhile, the low-temperature water is shunted to the energy storage tank through the heat storage mechanism;

the heat storage mechanism has two working states of heat storage and heat release:

in the heat release state, the electric butterfly valve a21, the electric butterfly valve a22, and the electric butterfly valve 14 are closed, and the electric butterfly valve a17, the electric butterfly valve a16, and the electric butterfly valve a15 are opened. The low-temperature water is pressurized in the heat storage pump set and then enters a low-temperature water interface of the energy storage tank through a low-temperature regulating valve group (a low-temperature regulating valve group consisting of an electric butterfly valve a 17-an electric butterfly valve a 20), and the high-temperature water is led to the front of a heat supply station heat network circulating pump by utilizing the height difference pressure of the tank body through the electric butterfly valve a 15. When the heat storage tank is switched from the heat release state to the heat storage state, the valve action sequence is an electric butterfly valve a22, an electric butterfly valve 14, an electric butterfly valve a17, an electric butterfly valve a21, an electric butterfly valve a16 and an electric butterfly valve a15, and the start and stop operation of a heat storage pump set is not needed in the switching process;

in the heat storage state, the electric butterfly valve a21, the electric butterfly valve a22, and the electric butterfly valve 14 are in the open state, and the electric butterfly valve a17, the electric butterfly valve a16, and the electric butterfly valve a15 are in the closed state. The low-temperature water passes through the electric butterfly valve a21 from the low-temperature water interface of the energy storage tank, enters the heat exchange mechanism through the third valve 3 after being pressurized by the heat storage pump set, and the heated high-temperature water is connected into the high-temperature water interface of the energy storage tank through the high-temperature part regulating valve (the high-temperature part regulating valve group consisting of the electric butterfly valve a12 and the electric butterfly valve a 15). When the energy storage tank is switched from a heat storage state to a heat release state, the valve action sequence is the electric butterfly valve a16, the electric butterfly valve a15, the electric butterfly valve a21, the electric butterfly valve a17, the electric butterfly valve a22 and the electric butterfly valve 14, and the start and stop operation of a heat storage pump set is not needed in the switching process.

In the embodiment, the heat storage pump group has the function of overcoming the height pressure difference of the tank body and the resistance of the pipeline for low-temperature water entering the energy storage tank when the energy storage tank releases heat; when the energy storage tank stores heat, the high-temperature water heat storage pump is replaced, the low-temperature water pressure is increased to provide power for heat storage circulation, and the low-temperature water medium parameters are low, so that the pump body does not need to be specially sealed and a cooling device is not added, the equipment construction cost is low, and the reliability is high. Meanwhile, one set of pump group drives the energy storage tank to operate, compared with an energy storage tank operation system in a peak regulation project of a thermal power plant, the energy storage tank operation system uses two sets of pump groups of a heat storage pump and a heat release pump, at least one set of pump group is saved, when the working state of the energy storage tank is switched in a heating season, the pump group is normally operated without starting and stopping, the pump group has low operation parameters, the equipment reliability is high, and the project cost is saved; when in a heat release state, low-temperature water is led out to the water inlet end of the low-temperature water inlet passage from the heat supply station return water pipe network after passing through the automatic water filter, and high-temperature water of the energy storage tank is connected to the heat supply station return water heat network circulating pump through the water outlet end of the high-temperature water outlet passage, compared with the situation that the high-temperature water of the energy storage tank is directly connected to the heat supply network water supply passage through the heat release pump in a peak regulation project of a thermal power plant, the pump set can save nearly 100.

The function of the heat supply network circulating pump group provides power when cold water in the heat supply network circulating mechanism flows back, so that the power overcomes the pressure difference in the heat supply network circulating mechanism and the resistance of a pipeline.

Meanwhile, a large number of flow and temperature monitoring devices are arranged in the embodiment and used for precisely controlling each valve through the PLC, and the water temperature of the interface of the energy storage tank is guaranteed to meet the requirement of the tank body on the stability of the inclined temperature layer.

The second embodiment is as follows: the embodiment is described with reference to fig. 3, 4, 6, 7 and 9, and provides a centralized heating system of a town heat supply coal-to-electricity main pipe-main pipe system with an electric boiler combined with an energy storage tank for heat storage;

the main pipe system central heating system comprises an electric boiler heating mechanism, a heat exchange mechanism, a heat supply network circulation mechanism, a heat storage mechanism, a cold side heat exchange main road and an energy storage tank, wherein the output end of the electric boiler heating mechanism is connected with the cold side heat exchange main road through the heat exchange mechanism, the heat source input end of the heat supply network circulation mechanism is connected with the cold side heat exchange main road, the heat source output end of the heat supply network circulation mechanism is connected with a heat supply unit, the heat input end of the heat storage mechanism is connected with the cold side heat exchange main road, the heat output end of the heat storage mechanism is connected with the heat supply network circulation mechanism, and the heat storage end of the heat storage mechanism is; the cold-side heat exchange main trunk circuit comprises a cold-side heat exchange high-temperature water path 1 and a cold-side heat exchange low-temperature water path 2;

the electric boiler heating mechanism comprises a plurality of electric boiler assemblies, each electric boiler assembly comprises an electric boiler, a hot water output pipeline, a cold water return pipeline, a chemical water supplementing pipeline and a chemical medicine adding pipeline, one end of the hot water output pipeline is communicated with the electric boiler, the other end of the hot water output pipeline is connected with an inlet of the heat energy input pipeline in the heat exchange mechanism, one end of the cold water return pipeline is communicated with the electric boiler, and the other end of the cold water return pipeline is connected with an outlet of the heat energy input pipeline in the heat exchange mechanism;

the chemical water replenishing pipeline is sequentially connected with a stop valve e11, a stop valve e12 and a cooling tank in series from the input end to the output end, the input end of the chemical water replenishing pipeline is connected with the chemical water replenishing device, the output end of the chemical water replenishing pipeline is communicated with the cold water return pipeline, and the output end of the chemical water replenishing pipeline is positioned between the stop valve e7 and the stop valve e 8; the chemical water replenishing pipeline is also provided with a buffering branch, one end of the buffering branch is communicated with the chemical water replenishing pipeline, one end of the buffering branch is arranged between the stop valve e11 and the stop valve e12, and one end of the buffering branch is communicated with the buffer tank;

a stop valve e14 is connected in series on the chemical dosing pipeline, one end of the chemical dosing pipeline is connected with the chemical dosing device, the other end of the chemical dosing pipeline is arranged between the chemical water replenishing pipeline and the stop valve e7, and the other end of the chemical dosing pipeline is communicated with the cold water return pipeline;

the heat storage mechanism is a header pipe heat storage mechanism;

the heat storage mechanism comprises a plurality of sub-devices and a main pipe trunk, wherein the main pipe trunk comprises a heat release high-temperature water outlet trunk 11 and a heat release low-temperature water inlet trunk 12;

each sub-device comprises a heat storage high-temperature water inlet waterway 5, a heat release high-temperature water outlet branch 13, a heat release low-temperature water inlet branch 14, a high-temperature water interface passage 9 and a low-temperature water interface passage 10;

the heat-releasing high-temperature water outlet branch 13 is sequentially connected in series with an electric butterfly valve a15 and a check valve b4 from a water inlet end to a water outlet end, the water inlet end of the heat-releasing high-temperature water outlet waterway 7 is communicated with one end of the high-temperature water interface passage 9, and the water outlet end of the heat-releasing high-temperature water outlet waterway 7 is communicated with the heat-releasing high-temperature water outlet trunk 11 in the main pipe trunk;

an electric butterfly valve a17, an electric butterfly valve a18, an electric butterfly valve a19 and a check valve b5 are sequentially connected in series with the heat-releasing low-temperature water inlet branch 14 from the water inlet end to the water outlet end, the electric butterfly valve 20 is connected in parallel with the electric butterfly valve a17, the regulating valve a18 and the electric butterfly valve a19, the water inlet end of the heat-releasing low-temperature water inlet water path 8 is communicated with the heat-releasing low-temperature water inlet main line 12 in the main pipe main line, and the water outlet end of the heat-releasing low-temperature water inlet branch 14 is communicated with one end of the low;

the high-temperature water interface passage 9 is sequentially connected with an electric butterfly valve 23, a flow measuring device c3 and an electric gate valve d5 in series from one end to the other end, one end of the high-temperature water interface passage 9 is communicated with the water outlet end of the heat storage high-temperature water inlet water path 5 and the water inlet end of the heat release high-temperature water outlet water path 7, and the other end of the high-temperature water interface passage 9 is communicated with the high-temperature water interface of a heat storage tank;

the low-temperature water interface passage 10 is sequentially connected with a flow measuring device c4 and an electric gate valve d6 in series from one end to the other end; one end of the high-temperature water interface passage 9 is communicated with the outlet end of the heat-releasing low-temperature water inlet waterway 8, and the other end of the low-temperature water interface passage 10 is communicated with the low-temperature water interface of a heat storage tank;

an electric gate valve d3 is connected in series at the position, close to the water outlet end, of the heat release high-temperature water outlet trunk line 11, and the water outlet end of the heat release high-temperature water outlet trunk line 11 is communicated with the heat supply network water return trunk line;

the heat release low-temperature water inlet trunk line 12 is sequentially connected in series with an electric gate valve d4, an electric butterfly valve a16 and a heat storage pump set from a water inlet end to a water outlet end, a water outlet of the heat storage pump set is connected with a heat storage low-temperature water outlet waterway 6, the heat storage low-temperature water outlet waterway 6 is sequentially connected in series with an electric butterfly valve a22 and a check valve b7 from the water inlet end to the water outlet end, the water inlet end of the heat storage low-temperature water outlet waterway is communicated with the water outlet of the heat storage pump set, and a cold side heat exchange low-temperature waterway 2 at the;

the outlet end of each heat release low-temperature water inlet branch 14 is communicated with the water inlet of the heat storage pump set through a check valve b6 and an electric butterfly valve a21 in sequence.

In the present embodiment, a heating system of a main pipe-main pipe system is provided, which is modified from the heating system provided in the first embodiment, and the first main pipe means that the same electric boiler heating mechanism is used to supply heat energy to both the heat grid circulation mechanism and the heat storage mechanism;

the second main pipe means that a plurality of energy storage tanks are adopted for working in centralized heat supply, each energy storage tank corresponds to one energy storage mechanism, in order to simplify the design cost in practical application, a heat storage pump group in each set of energy storage mechanism is omitted, a set of large-flow heat storage pump group is arranged on a low-temperature water main pipe, a plurality of energy storage tanks are driven at the same time, a set of main pipe control system is formed, high-temperature and low-temperature water of the plurality of energy storage tanks is connected to the corresponding main pipe through branch pipes, and the valve control logics of the scheme are the same when the working states of the energy storage tanks are switched;

meanwhile, during central heating, the water in the heating mechanism in the electric boiler is seriously consumed along with heat evaporation, and meanwhile, a water supplementing device is additionally arranged in each electric boiler component in the heating mechanism in the electric boiler, and the used water supplementing device is subjected to chemical treatment and is used for ensuring the sufficiency of a water source in the electric boiler.

The third concrete implementation mode: the embodiment is described with reference to fig. 3, 4, 6, 7 and 10, and is further limited by a town heat supply coal-to-main pipe centralized heating system with an electric boiler combined with an energy storage tank for heat storage in the second embodiment, the first embodiment is a unit-main pipe centralized heating system improved on the basis of the main pipe-main pipe centralized heating system, the electric boiler heating mechanism in the unit-main pipe heating system is divided into a first electric boiler heating direct supply mechanism and a second electric boiler heating heat storage mechanism, the cold side heat exchange main pipe is divided into a first cold side heat exchange direct supply main pipe and a second cold side heat exchange main pipe, the heat exchange mechanisms are divided into a first heat exchanger direct supply mechanism and a second heat exchange heat storage mechanism, the first electric boiler heating direct supply mechanism is connected with the first cold side heat exchange direct supply main pipe through the first heat exchanger direct supply mechanism, and the second electric boiler heating heat storage mechanism is connected with the second cold side heat exchange main pipe through the second heat exchange mechanism, the heat exchange water input pipeline in a plate heat exchanger assembly of the first heat exchanger direct-supply mechanism is connected with the heat exchange water input pipeline in a plate heat exchanger assembly of the second heat exchange heat storage mechanism through a pipeline, an electric gate valve d9 is connected on the pipeline in series, the heat exchange water output pipeline in a plate heat exchanger assembly of the first heat exchanger direct-supply mechanism is connected with the heat exchange water output pipeline in a plate heat exchanger assembly of the second heat exchange heat storage mechanism through a pipeline, and an electric gate valve d10 is connected on the pipeline in series. Other components are the same as in the embodiments.

In the embodiment, the heating mechanism of the electric boiler, the heat exchange mechanism and the cold-side heat exchange trunk circuit in the heating system of the main pipe and the main pipe are further optimized, the heating mechanism of the electric boiler, the heat exchange mechanism and the cold-side heat exchange trunk circuit are respectively partitioned and are specifically divided into a direct supply unit (acting on a heat network circulation mechanism) and a heat storage unit (acting on the heat storage mechanism), heat exchange water in the cold-side heat exchange trunk circuit in the original system is heated by the heat network circulation mechanism and is also used for energy storage of the heat storage mechanism, the same output source simultaneously supplies energy to the two mechanisms, the working stability of the system at the power peak value can be influenced, and once the output source has a problem, the whole system can be failed, so the embodiment further optimizes the direct supply mechanism, and supplies energy to the heat network circulation mechanism by the direct supply unit consisting of the first electric boiler heating direct supply mechanism, the first heat exchange direct supply mechanism and the first cold-side heat exchange trunk circuit, through second electric boiler heating heat accumulation mechanism, the heat accumulation unit that second heat transfer heat accumulation mechanism and second cold side heat transfer heat accumulation trunk are constituteed carries out the energy storage to heat accumulation mechanism, the stability of system work when electric power peak value has been guaranteed, the guiding device has still been increased on first heat transfer direct supply mechanism and second heat transfer heat accumulation mechanism simultaneously, when avoiding breaking down at a set of output source, lead to local system failure, can be timely carry out the alternative work through another a set of output source that carries on, the time of salvageing is striven for to the at utmost when avoiding producing the accident.

The fourth concrete implementation mode: the embodiment is described with reference to fig. 3, 4, 6, 8 and 11, and provides a centralized heating system of a unit system which changes town heating coal into electricity by combining an electric boiler with an energy storage tank for heat storage;

the unit-unit system central heating system comprises an electric boiler heating mechanism, a heat exchange mechanism, a heat supply network circulation mechanism, a heat storage mechanism, a cold side heat exchange main road and an energy storage tank, wherein the output end of the electric boiler heating mechanism is connected with the cold side heat exchange main road through the heat exchange mechanism, the heat source input end of the heat supply network circulation mechanism is connected with the cold side heat exchange main road, the heat source output end of the heat supply network circulation mechanism is connected with a heat supply unit, the heat input end of the heat storage mechanism is connected with the cold side heat exchange main road, the heat output end of the heat storage mechanism is connected with the heat supply network circulation mechanism, and the heat storage end of the heat storage mechanism is connected; the cold-side heat exchange main trunk circuit comprises a cold-side heat exchange high-temperature water path 1 and a cold-side heat exchange low-temperature water path 2;

the heat storage mechanism is a unit heat storage mechanism;

the heat storage mechanism comprises a plurality of heat storage units, a heat release high-temperature water outlet passage 15 and a heat release low-temperature water inlet passage 16;

each heat storage unit comprises a heat storage high-temperature water inlet waterway 5, a heat release high-temperature water outlet branch 13, a heat release low-temperature water inlet branch 14, a high-temperature water interface passage 9 and a low-temperature water interface passage 10;

an electric butterfly valve a16, a heat storage pump set, an electric butterfly valve a17, an electric butterfly valve a18, an electric butterfly valve a19 and a check valve b5 are sequentially connected in series with the heat release low-temperature water inlet branch 14 from the water inlet end to the water outlet end, the electric butterfly valve 20 is connected in parallel with the electric butterfly valve a17, a regulating valve a18 and the electric butterfly valve a19, a branch is arranged between the water outlet end of the heat release low-temperature water inlet water channel 8 and the water inlet of the heat storage pump set, a check valve b6 and an electric butterfly valve a21 are sequentially connected in series with the branch from the water inlet to the water outlet, the water inlet end of the heat release low-temperature water inlet water channel 8 is communicated with the heat release low-temperature water inlet channel 16;

the heat storage low-temperature water outlet waterway 6 is sequentially connected with an electric butterfly valve a22 and a check valve b7 in series from a water inlet end to a water outlet end, the water inlet end of the heat storage low-temperature water outlet waterway is communicated with a water outlet of a heat storage pump set, and a cold side heat exchange low-temperature waterway 2 at the water outlet end of the heat storage low-temperature water outlet waterway is communicated with the water outlet end of the heat storage low-temperature water;

an electric gate valve d3 is connected in series at the position, close to the water outlet end, of the heat release high-temperature water outlet passage 15, and the water outlet end of the heat release high-temperature water outlet passage 15 is communicated with the heat supply network water return main passage;

the water inlet end of the heat release low-temperature water inlet passage 16 close to the water inlet end is connected with an electric gate valve d4 in series, and the water inlet end of the heat release high-temperature water outlet passage 15 is communicated with the heat supply network water return main passage;

the tail end of the heat release high-temperature water outlet passage 15 and the tail end of the heat release low-temperature water inlet passage 16 are connected through a branch, a check valve b13 is connected in series on the branch, and the tail end of the heat release low-temperature water inlet passage 16 is connected in series with an electric gate valve d 11.

In this embodiment, a unit-unit heating system is provided, which is an improvement of the unit-header heating system provided in the third embodiment, and a plurality of energy storage tanks are mostly used for central heating, so that a unit system can be formed by matching one heat storage mechanism and one energy storage tank, and a plurality of energy storage tank systems are operated in parallel. In this embodiment, through a plurality of heat accumulation mechanisms and a plurality of energy storage tank one-to-one, be used for respectively linking to each other with the energy storage tank that corresponds, compare in unit-header system heating system, every unit (heat accumulation mechanism and heat storage tank constitute) has all set up the energy storage pump package in the unit-unit system heating system, stability when having guaranteed the system operation, in having avoided unit-header system heating system, because the energy storage pump package on the energy storage mechanism header (contrast embodiment two and figure 10) trunk line breaks down and leads to the condition emergence of system failure, with regard to system operation actual conditions simultaneously, unit system heating system compares in header system heating system also more stable in the aspect of the heat accumulation, the effect is also better.

The heating system of unit-unit system described in this embodiment can also be changed to a main pipe-unit heating system, and the electric boiler heating group is used to simultaneously supply the direct supply unit (acting on the heat network circulation mechanism) and the heat storage unit (acting on the heat storage mechanism), so that the installation is simpler and more labor-saving, and the installation is suitable for the update and reconstruction of the existing small-sized electric energy heating station, although the installation is not as good as the heating system of unit-unit system in terms of effect and maintenance degree.

Claims

1. The coal that electric boiler combines energy storage jar heat-retaining changes electric central heating system its characterized in that: the heating system comprises an electric boiler heating mechanism, a heat exchange mechanism, a heat supply network circulation mechanism, a heat storage mechanism, a cold side heat exchange main road and an energy storage tank, wherein the output end of the electric boiler heating mechanism is connected with the cold side heat exchange main road through the heat exchange mechanism, the heat source input end of the heat supply network circulation mechanism is connected with the cold side heat exchange main road, the heat source output end of the heat supply network circulation mechanism is connected with a heat supply unit, the heat input end of the heat storage mechanism is connected with the cold side heat exchange main road, the heat output end of the heat storage mechanism is connected with the heat supply network circulation mechanism, and the heat storage end of the heat storage mechanism is connected;

the cold side heat exchange main trunk comprises a cold side heat exchange high-temperature water path (1) and a cold side heat exchange low-temperature water path (2).

2. The coal-to-electricity central heating system with the electric boiler storing heat in combination with the energy storage tank as claimed in claim 1, wherein: the electric boiler heating mechanism comprises a plurality of electric boiler assemblies, each electric boiler assembly comprises an electric boiler, a hot water output pipeline and a cold water backflow pipeline, one end of each hot water output pipeline is communicated with the electric boiler, the other end of each hot water output pipeline is connected with an inlet of the heat energy input pipeline in the heat exchange mechanism, one end of each cold water backflow pipeline is communicated with the electric boiler, and the other end of each cold water backflow pipeline is connected with an outlet of the heat energy input pipeline in the heat exchange mechanism.

3. The coal-to-electricity central heating system with the electric boiler storing heat in combination with the energy storage tank as claimed in claim 2, characterized in that: the heat exchange mechanism comprises a plurality of plate type heat exchanger components, each plate type heat exchanger component is arranged corresponding to one electric boiler component, each plate type heat exchanger component comprises a plate type heat exchanger, a heat exchange water output pipeline and a heat exchange water input pipeline, the other end of a hot water output pipeline in each electric boiler component is connected with an inlet of a heat energy input pipeline in one plate type heat exchanger, the other end of a cold water return pipeline in each electric boiler component is connected with an outlet of the heat energy input pipeline in one plate type heat exchanger, one end of each heat exchange water input pipeline is connected with an inlet of the heat energy output pipeline in the plate type heat exchanger, the other end of the heat exchange water input pipeline is connected with a cold side heat exchange low-temperature water channel (2) in a cold side heat exchange main circuit, one end of each heat exchange water output pipeline is connected with an outlet of the heat energy output pipeline in the plate type heat exchanger, and the other end of each heat exchange water output pipeline is connected with a cold side heat exchange high-temperature water channel (, an electric gate valve d1 is connected in series on each heat exchange water input pipeline, an electric gate valve d2 is connected in series on each heat exchange water output pipeline, a branch is arranged between each heat exchange water output pipeline and each heat exchange water input pipeline, and a stop valve e1 is connected in series on the branch.

4. The coal-to-electricity central heating system with the electric boiler storing heat in combination with the energy storage tank as claimed in claim 3, wherein: the heat supply network circulating mechanism comprises a heat supply network water supply main line (3) and a heat supply network water return main line (4);

one end of the heat supply network water supply main road is communicated with the cold side heat exchange high-temperature water path (1), the other end of the heat supply network water supply main road is communicated with a hot water pipe in the heat supply unit, an electric butterfly valve a1 is arranged on the heat supply network water supply main road close to the communication position of the heat supply network water supply main road and the cold side heat exchange high-temperature water path (1), and an electric butterfly valve a2 and a flow measuring device c1 are sequentially arranged on the heat supply network water supply main road close to the communication position of the heat supply network water supply main road and the heat supply unit;

one end of the heat supply network backwater main road is communicated with the cold side heat exchange low-temperature waterway (2), the other end of the heat supply network backwater main road is communicated with the cold water pipe in the heat supply unit, an electric butterfly valve a3 and a heat supply network circulating pump set are arranged on the heat supply network backwater main road near the communication position of the heat supply network backwater main road and the cold side heat exchange high-temperature waterway (1), and an electric butterfly valve a4, a flow measuring device c2, a water filter L1 and an electric gate valve d8 are sequentially arranged on the heat supply network backwater main road near the communication position of the heat supply network backwater main road and the heat supply unit;

a communicating branch is arranged between one end of the heat supply network water return main road close to the heat supply unit and one end of the heat supply network water supply main road close to the heat supply unit, and an electric butterfly valve a11 is arranged on the communicating branch.

5. The coal-to-electricity central heating system with the electric boiler storing heat in combination with the energy storage tank as claimed in claim 4, wherein: the heat storage mechanism comprises a heat storage high-temperature water inlet waterway (5), a heat storage low-temperature water outlet waterway (6), a heat release high-temperature water outlet waterway (7), a heat release low-temperature water inlet waterway (8), a high-temperature water interface passage (9) and a low-temperature water interface passage (10);

the heat-storage high-temperature water inlet water channel (5) is sequentially connected with an electric butterfly valve a12, a regulating valve a13, an electric butterfly valve a14 and a check valve b3 in series from a water inlet end to a water outlet end, and the electric butterfly valve a15 is connected with an electric butterfly valve a12, an electric butterfly valve a13 and an electric butterfly valve a14 in parallel; the water inlet end of the heat-storage high-temperature water inlet waterway (5) is communicated with the cold-side heat-exchange high-temperature waterway (1), and the water outlet end of the heat-storage high-temperature water inlet waterway (5) is communicated with one end of the high-temperature water interface passage (9);

the heat release high-temperature water outlet waterway (7) is sequentially connected with an electric butterfly valve a15, a check valve b4 and an electric gate valve d3 in series from a water inlet end to a water outlet end, the water inlet end of the heat release high-temperature water outlet waterway (7) is communicated with one end of a high-temperature water interface passage (9), the water outlet end of the heat release high-temperature water outlet waterway (7) is communicated with a heat supply network water return trunk,

the heat-releasing low-temperature water inlet waterway (8) is sequentially connected with an electric gate valve d4, an electric butterfly valve a16, a heat storage pump set, an electric butterfly valve a17, an electric butterfly valve a18, an electric butterfly valve a19 and a check valve b5 in series from a water inlet end to a water outlet end, an electric butterfly valve 20, an electric butterfly valve a17, a regulating valve a18 and an electric butterfly valve a19 are connected in parallel, a branch is arranged between the water outlet end of the heat-releasing low-temperature water inlet waterway (8) and a water inlet of the heat storage pump set, a check valve b6 and an electric butterfly valve a21 are sequentially connected in series between the water inlet and the water outlet of the branch from the water inlet to the water outlet end, the water inlet end of the heat-releasing low-temperature water inlet waterway (8) is communicated with a heat supply network;

the heat storage low-temperature water outlet waterway (6) is sequentially connected with an electric butterfly valve a22 and a check valve b7 in series from a water inlet end to a water outlet end, the water inlet end of the heat storage low-temperature water outlet waterway is communicated with a water outlet of a heat storage pump set, and a cold side heat exchange low-temperature waterway (2) at the water outlet end of the heat storage low-temperature water outlet waterway is communicated;

the high-temperature water interface passage (9) is sequentially connected with an electric butterfly valve 23, a flow measuring device c3 and an electric gate valve d5 in series from one end to the other end, one end of the high-temperature water interface passage (9) is communicated with the water outlet end of the heat storage high-temperature water inlet waterway (5) and the water inlet end of the heat release high-temperature water outlet waterway (7), and the other end of the high-temperature water interface passage (9) is communicated with the high-temperature water interface of the heat storage tank;

the low-temperature water interface passage (10) is sequentially connected with a flow measuring device c4 and an electric gate valve d6 in series from one end to the other end; one end of the high-temperature water interface passage (9) is communicated with the outlet end of the heat-releasing low-temperature water inlet waterway (8), and the other end of the low-temperature water interface passage (10) is communicated with the low-temperature water interface of the heat storage tank;

a branch is arranged between one end of the heat release low-temperature water inlet waterway (8) close to the heat supply network circulating mechanism and one end of the heat release high-temperature water outlet waterway (7) close to the heat supply network circulating mechanism, and the branch is sequentially connected with an electric gate valve d7 and a check valve b8 in series from a water inlet end to a water outlet end;

6. the coal-to-electricity centralized heating system with the combination of the electric boiler and the energy storage tank for heat storage according to claim 2, wherein the electric boiler assembly further comprises a chemical water supplementing pipeline and a chemical dosing pipeline, one end of a hot water output pipeline is communicated with the electric boiler, the other end of the hot water output pipeline is connected with an inlet of a heat energy input pipeline in the heat exchange mechanism, one end of a cold water return pipeline is communicated with the electric boiler, and the other end of the cold water return pipeline is connected with an outlet of the heat energy input pipeline in the heat exchange mechanism;

a branch is arranged between the hot water output pipeline and the cold water return pipeline, and a stop valve e15 is connected in series on the branch.

7. The coal-to-electricity centralized heating system with the combination of the electric boiler and the energy storage tank for heat storage according to claim 5, wherein the heat storage mechanism is a header pipe heat storage mechanism;

the heat storage mechanism comprises a plurality of sub-devices and a main pipe trunk, wherein the main pipe trunk comprises a heat-releasing high-temperature water outlet trunk (11) and a heat-releasing low-temperature water inlet trunk (12);

each sub-device comprises a heat storage high-temperature water inlet waterway (5), a heat release high-temperature water outlet branch (13), a heat release low-temperature water inlet branch (14), a high-temperature water interface passage (9) and a low-temperature water interface passage (10);

the heat-storage high-temperature water inlet water channel (5) is sequentially connected with an electric butterfly valve a12, a regulating valve a13, an electric butterfly valve a14 and a check valve b3 in series from a water inlet end to a water outlet end, wherein the electric butterfly valve a15 is connected with an electric butterfly valve a12, an electric butterfly valve a13 and an electric butterfly valve a14 in parallel; the water inlet end of the heat-storage high-temperature water inlet waterway (5) is communicated with the cold-side heat-exchange high-temperature waterway (1), and the water outlet end of the heat-storage high-temperature water inlet waterway (5) is communicated with one end of the high-temperature water interface passage (9);

an electric butterfly valve a15 and a check valve b4 are sequentially connected in series with the heat-releasing high-temperature water outlet branch (13) from the water inlet end to the water outlet end, the water inlet end of the heat-releasing high-temperature water outlet waterway (7) is communicated with one end of the high-temperature water interface passage (9), and the water outlet end of the heat-releasing high-temperature water outlet waterway (7) is communicated with the heat-releasing high-temperature water outlet trunk (11) in the main pipe trunk;

an electric butterfly valve a17, an electric butterfly valve a18, an electric butterfly valve a19 and a check valve b5 are sequentially connected in series with the heat-releasing low-temperature water inlet branch (14) from the water inlet end to the water outlet end, the electric butterfly valve 20 is connected with the electric butterfly valve a17, the regulating valve a18 and the electric butterfly valve a19 in parallel, the water inlet end of the heat-releasing low-temperature water inlet water channel (8) is communicated with the heat-releasing low-temperature water inlet main line (12) in the main pipe main line, and the water outlet end of the heat-releasing low-temperature water inlet branch (14) is communicated with one end of the low-temperature water interface;

the high-temperature water interface passage (9) is sequentially connected with an electric butterfly valve 23, a flow measuring device c3 and an electric gate valve d5 in series from one end to the other end, one end of the high-temperature water interface passage (9) is communicated with the water outlet end of the heat storage high-temperature water inlet waterway (5) and the water inlet end of the heat release high-temperature water outlet waterway (7), and the other end of the high-temperature water interface passage (9) is communicated with the high-temperature water interface of a heat storage tank;

the low-temperature water interface passage (10) is sequentially connected with a flow measuring device c4 and an electric gate valve d6 in series from one end to the other end; one end of the high-temperature water interface passage (9) is communicated with the outlet end of the heat-releasing low-temperature water inlet waterway (8), and the other end of the low-temperature water interface passage (10) is communicated with a low-temperature water interface of a heat storage tank;

an electric gate valve d3 is connected in series at the position, close to the water outlet end, of the heat release high-temperature water outlet main line (11), and the water outlet end of the heat release high-temperature water outlet main line (11) is communicated with the heat supply network water return main line;

the heat release low-temperature water inlet trunk (12) is sequentially connected with an electric gate valve d4, an electric butterfly valve a16 and a heat storage pump set in series from the water inlet end to the water outlet end, the water outlet of the heat storage pump set is connected with a heat storage low-temperature water outlet waterway (6), the heat storage low-temperature water outlet waterway (6) is sequentially connected with an electric butterfly valve a22 and a check valve b7 in series from the water inlet end to the water outlet end, the water inlet end of the heat storage low-temperature water outlet waterway is communicated with the water outlet of the heat storage pump set, and the cold side heat exchange low-temperature waterway (2) at the;

the outlet end of each heat release low-temperature water inlet branch (14) is communicated with the water inlet of the heat storage pump set through a check valve b6 and an electric butterfly valve a21 in sequence.

8. The coal-to-electricity central heating system with an electric boiler combined with an energy storage tank for heat storage according to claim 7, wherein the heat storage mechanism is a unit heat storage mechanism;

the heat storage mechanism comprises a plurality of heat storage units, a heat release high-temperature water outlet passage (15) and a heat release low-temperature water inlet passage (16);

each heat storage unit comprises a heat storage high-temperature water inlet waterway (5), a heat storage low-temperature water outlet waterway (6), a heat release high-temperature water outlet branch (13), a heat release low-temperature water inlet branch (14), a high-temperature water interface passage (9) and a low-temperature water interface passage (10);

an electric butterfly valve a16, a heat storage pump set, an electric butterfly valve a17, an electric butterfly valve a18, an electric butterfly valve a19 and a check valve b5 are sequentially connected in series with the heat release low-temperature water inlet branch (14) from the water inlet end to the water outlet end, an electric butterfly valve 20, an electric butterfly valve a17, a regulating valve a18 and an electric butterfly valve a19 are connected in parallel, a branch is arranged between the water outlet end of the heat release low-temperature water inlet water channel (8) and the water inlet of the heat storage pump set, a check valve b6 and an electric butterfly valve a21 are sequentially connected in series with the branch from the water inlet to the water outlet, the water inlet end of the heat release low-temperature water inlet water channel (8) is communicated with the heat release low-temperature water inlet channel (16), and the water outlet end of;

an electric gate valve d3 is connected in series at the position, close to the water outlet, of the heat release high-temperature water outlet passage (15), and the water outlet end of the heat release high-temperature water outlet passage (15) is communicated with the heat supply network water return main passage;

an electric gate valve d4 is connected in series at the position, close to the water inlet end, of the heat release low-temperature water inlet passage (16), and the water inlet end of the heat release high-temperature water outlet passage (15) is communicated with the heat supply network water return main passage;

the tail end of the heat release high-temperature water outlet passage (15) is connected with the tail end of the heat release low-temperature water inlet passage (16) through a branch, a check valve b13 is connected in series on the branch, and an electric gate valve d11 is connected in series at the tail end of the heat release low-temperature water inlet passage (16).

9. The coal-to-electricity central heating system with an electric boiler combined with an energy storage tank for heat storage according to claim 1, 7 or 8, wherein the electric boiler heating mechanism in the heating system is divided into an electric boiler heating direct supply mechanism and an electric boiler heating heat storage mechanism, the cold-side heat exchange main line is divided into a cold-side heat exchange direct supply main line and a cold-side heat exchange heat storage main line, the heat exchange mechanism is divided into a heat exchange direct supply mechanism and a heat exchange heat storage mechanism, the electric boiler heating direct supply mechanism is connected with the cold-side heat exchange direct supply main line through the heat exchange direct supply mechanism and the cold-side heat exchange direct supply main line, the electric boiler heating heat storage mechanism is connected with the cold-side heat exchange heat storage main line through the heat exchange heat storage mechanism, a heat exchange water input pipe in one plate type heat exchanger component in the heat exchange direct supply mechanism is connected with a heat exchange water input pipe in one plate type heat exchanger component in the heat exchange heat storage, and a heat exchange water output pipeline in one plate heat exchanger assembly in the heat exchange direct supply mechanism is connected with a heat exchange water delivery pipeline in one plate heat exchanger assembly in the heat exchange heat storage mechanism through a pipeline, and the pipeline is connected with an electric gate valve d10 in series.