CN105841391A - A distributed energy system with active energy storage regulation and its regulation method - Google Patents

Abstract

The invention relates to the technical field of energy systems, in particular to an active energy storage regulation and control distributed energy system and a regulation and control method thereof. The invention discloses an active energy storage regulation and control distributed energy system, which comprises a gas turbine generator set, an accumulator component, an absorption refrigerator component, a phase change cold accumulator component and a flue gas-water heat exchanger component, wherein the gas turbine generator set is connected with the accumulator component; waste heat flue gas generated by the gas turbine generator set flows through the absorption refrigerator component and the flue gas-water heat exchanger component in sequence; the power load end is connected with the accumulator component in parallel and is electrically connected with the gas turbine generator set; the cold load end is connected with the phase change cold accumulator component in parallel and is connected with the absorption refrigerator component; the flue gas-water heat exchanger component is connected with the heat load end. The energy system can ensure that power supply, cold supply and heat supply always meet the dynamic change of cold, heat and electric loads, optimize the full-working-condition performance of the system and coordinate the output proportion of cold, heat and electricity, realize the reliable operation of the system under the full working condition and improve the economic benefit of the operation of the system.

Description

A distributed energy system with active energy storage regulation and its regulation method

technical field

The invention relates to the technical field of energy systems, in particular to a distributed energy system with active energy storage regulation and a regulation method thereof.

Background technique

Scientific energy use and energy conservation are becoming more and more urgent and important in today's energy shortage. At present, my country's energy utilization efficiency is low, and the overall efficiency of energy processing, conversion, storage, transportation and terminal utilization is about 33%. Advanced energy supply systems, renewable energy and greenhouse gas control related to scientific energy use are the strategic focus of my country's energy science and technology development.

The distributed energy supply system is an advanced energy supply system, and the combined cooling, heating and power supply system is its main form. In the distributed energy supply system, the high-temperature heat energy (900-1200°C) released by the chemical energy of the fuel is firstly generated through advanced micro and small power equipment, and the efficiency can reach 30%-38%. Sound, absorption refrigeration, heat pump and other methods are further converted and utilized, and the low-temperature heat that is difficult to convert is reused for heating, so it has a high energy utilization rate. The system is highly open, and its layout is determined by the user's specific requirements and local resources, economic and technical conditions. Places such as industrial parks, residential areas, and commercial areas have diverse energy demands, and usually have electricity, cooling, and heating demands at the same time, which is very suitable for the use of combined cooling, heating, and power systems.

The cooling, heating and power distributed energy system is designed to operate under rated working conditions, and the energy utilization efficiency of the system is relatively high. However, in the actual operation process, the user's demand for cooling, heating, and electricity loads varies with factors such as seasons, time, and external environments, and the energy demand and the ratio between them vary greatly. As a result, the combined cooling, heating and power system always deviates from the design operating conditions, the energy consumption of the system increases, and the energy utilization efficiency drops significantly. However, the contradiction between the design characteristics of the distributed energy system and the actual operation situation has become a major problem affecting its operation effect and popularization and application.

Contents of the invention

The purpose of the present invention is to provide a distributed energy system with active energy storage and control, which can adapt to load changes and has high energy utilization efficiency, aiming at the shortcomings of the prior art.

Another object of the present invention is to provide a control method for a distributed energy system with active energy storage control to address the shortcomings of the prior art, so that the distributed energy system can adapt to changes in load and have high energy utilization efficiency.

In order to achieve the above object, an active energy storage and control distributed energy system of the present invention includes a gas turbine generator set, and also includes an electrical accumulator assembly, an absorption refrigerator assembly, a phase change cold storage assembly, and a flue gas-water heat exchanger component; the waste heat flue gas generated by the gas turbine generator set flows through the absorption refrigerator component and the flue gas-water heat exchanger component in sequence; It is connected in parallel with the phase change cold storage assembly and is connected with the absorption refrigeration machine assembly; the flue gas-water heat exchanger assembly is connected with the heat load end.

Preferably, a phase change heat accumulator assembly is also included, and the phase change heat accumulator assembly is connected in parallel with the heat load end and is connected with the flue gas-water heat exchanger assembly.

Preferably, the temperature of the waste heat flue gas flowing out from the gas turbine generator set is 240°C-450°C; the temperature of the waste heat flue gas flowing out from the absorption refrigerator assembly is 100°C-200°C.

Preferably, the freezing point of the phase change cold storage material of the phase change cold storage assembly is 7°C-10°C.

Preferably, it also includes a heat exchanger assembly, the heat exchanger assembly and the absorption refrigerating machine assembly are connected in parallel to the delivery pipeline of the waste heat flue gas, and the heat exchanger assembly absorbs heat from the waste heat flue gas for preheating the fuel of the gas turbine generator set , the fuel flows through the heat exchanger assembly before entering the gas turbine generator set.

Preferably, it also includes a first three-way valve and a second three-way valve, the first three-way valve is arranged between the gas turbine generator set and the absorption refrigerating machine assembly, and the second three-way valve is arranged between the absorption refrigerating machine assembly and the smoke Between the air-water heat exchanger components, both ends of the heat exchanger components communicate with the first three-way valve and the second three-way valve respectively.

The control method of a distributed energy system with active energy storage regulation of the present invention, when the electric load is lower than the power generated by the generator, regulates the electric storage component to store excess electric energy; when the electric load is higher than the power generated by the generator, regulates The accumulator assembly supplies power to the electric load;

When the cooling load is lower than the cooling capacity provided by the absorption chiller assembly per unit time, the cooling capacity generated by the absorption chiller assembly is adjusted to flow through the phase change cold storage assembly, so that the phase change material of the phase change cold storage assembly is phase changed and solidified , to store cold energy in the phase change cold storage assembly; when the cooling load is higher than the cooling capacity provided by the absorption refrigerator assembly per unit time, the high-temperature return water that regulates the cooling load flows through the phase change cold storage assembly to make the solid phase change material Melt, and supply the cold energy stored in the phase change cold accumulator assembly to the cooling load;

When the heat load is lower than the heat provided by the flue gas-water heat exchanger assembly per unit time, the heat generated by the flue gas-water heat exchanger assembly is adjusted to flow through the phase change heat accumulator assembly to make the phase change heat accumulator assembly The phase change material melts and stores heat in the phase change heat storage component; when the heat load is higher than the heat provided by the flue gas-water heat exchanger component per unit time, the low temperature return water that regulates the heat load flows through the phase change heat storage The heat accumulator assembly solidifies the liquid phase change material, and supplies the heat stored in the phase change heat accumulator assembly to the heat load.

Beneficial effects of the present invention: a distributed energy system with active energy storage regulation of the present invention, by regulating the input or output power of the accumulator component and the phase-change cold storage component, the power supply, cooling and heating can always meet the cooling requirements. The dynamic changes of load, heat and electricity can optimize the performance of the system in all working conditions and coordinate the output ratio of cold, heat and electricity, realize efficient and reliable operation of the system in all working conditions, and can greatly improve the economic benefits of system operation. The control method of the distributed energy system of the active energy storage control of the present invention, through the control of the active energy storage control of the distributed energy system, the power supply, cooling and heating of the energy system can always meet the requirements of cold, heat, electricity The dynamic change of the load reduces the energy consumption of the energy system and improves the fuel utilization efficiency of the energy system.

Description of drawings

FIG. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of Embodiment 2 of the present invention.

Reference signs include:

1—gas turbine generator set 2—electric storage assembly 3—absorption chiller assembly

4—phase change cold storage assembly 5—flue gas-water heat exchanger assembly 6—phase change heat storage assembly

7—Heat exchanger assembly 8—First three-way valve 9—Second three-way valve

10—Flow path of waste heat flue gas

11—electrical load end 12—cooling load end 13—heating load end.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiment one.

As shown in Figure 1, a distributed energy system with active energy storage regulation of the present invention includes a gas turbine generator set 1, and also includes an electrical accumulator assembly 2, an absorption refrigerator assembly 3, a phase change cold storage assembly 4, and a flue gas -Water heat exchanger assembly 5; waste heat flue gas generated by gas turbine generator set 1 flows through absorption refrigerator assembly 3 and flue gas-water heat exchanger assembly 5 in sequence; power load terminal 11 is connected in parallel with electrical storage assembly 2 and It is electrically connected with the gas turbine generator set 1; the cooling load end 12 is connected in parallel with the phase change cold storage assembly 4 and both are connected with the absorption refrigerator assembly 3; the flue gas-water heat exchanger assembly 5 is connected with the heat load end 13.

In the distributed energy system with active energy storage control of the present invention, the fuel enters the gas turbine generator set 1 to burn and generate electricity, and the electric energy can be incorporated into the regional power grid to provide electric energy for users. The combustion product is waste heat flue gas with a large amount of waste heat It flows through the absorption refrigerating machine assembly 3 and the flue gas-water heat exchanger assembly 5 in sequence to realize stepwise utilization of energy. Specifically, by regulating the gas turbine generator set 1, the temperature of the waste heat flue gas discharged from the gas turbine generator set 1 is 240°C~450°C, which is high-temperature waste heat flue gas, which can be used to provide energy for the cooling of the absorption refrigerator assembly 3 , to meet the user's cooling load demand. After the high-temperature waste heat flue gas absorbs heat through the absorption refrigerator component 3, it becomes low-temperature waste heat flue gas. Enter the flue gas-water heat exchanger assembly 5, and provide users with hot water load through heat exchange, which is used to provide heating or bathing water for users. The demand for water temperature of the hot water load is lower than 100°C.

Through regulation and control, a distributed energy system with active energy storage regulation of the present invention can be used to regulate and control the accumulator assembly 2 to store excess electric energy when the electric load is lower than the power generated by the generator; when the electric load is higher than the power generated by the generator When the regulation accumulator component 2 supplies power to the electric load; when the cooling load is lower than the cooling capacity provided by the absorption chiller component 3 per unit time, regulate the cold capacity generated by the absorption chiller component 3 to flow through the phase change cold storage component 4. Make the phase change material of the phase change regenerator assembly 4 phase change and solidify, and store the cooling capacity in the phase change regenerator assembly 4; when the cooling load is higher than the cooling capacity provided by the absorption refrigerator assembly 3 per unit time, control The high-temperature return water of the cooling load flows through the phase change regenerator assembly 4 to melt the solid phase change material, and supply the cold energy stored in the phase change regenerator assembly 4 to the cooling load.

A distributed energy system with active energy storage regulation of the present invention, by regulating the input or output power of the accumulator assembly 2 and the phase-change cold storage assembly 4, the power supply, cooling and heating can always meet the requirements of cold, heat, and electricity. The dynamic change of the load can optimize the performance of the system in all working conditions and coordinate the output ratio of cooling, heating and electricity, realize efficient and reliable operation of the system in all working conditions, and can greatly improve the economic benefits of system operation.

The energy storage method of the accumulator assembly 2 may be battery energy storage, superconducting energy storage, mechanical energy storage, or capacitor energy storage. The energy density of the accumulator component 2 is high, and it can provide relatively large energy with a small volume and weight; the power density of the accumulator component 2 is high, and it can provide the compensation power required for sudden changes in system power, and has a fast response speed; energy storage High efficiency; good high and low temperature performance, able to adapt to special environments, and environmentally friendly.

The phase change regenerator assembly 4 can be an encapsulated spherical phase change regenerator assembly 4, a flat plate type phase change regenerator assembly 4, a casing type phase change regenerator assembly 4, a shell-and-tube cross-flow phase change regenerator assembly 4, Shell-and-tube parallel flow phase change cold storage assembly 4. Among them, the phase change temperature of the phase change material of the regenerator is 7-10°C, which overcomes the shortcomings of low water storage density and low operating efficiency of the ice storage refrigeration unit, and has a large energy storage density, which can increase the evaporation temperature and temperature of the refrigeration unit. 13OP value, thereby improving the energy utilization rate of the system and saving energy consumption.

Preferably, a phase change heat accumulator assembly 6 is also included, and the phase change heat accumulator assembly 6 is connected in parallel with the heat load end 13 and is connected with the flue gas-water heat exchanger assembly 5 . A distributed energy system with active energy storage regulation of the present invention can realize the regulation and control of the flue gas-water heat exchanger when the heat load is lower than the heat provided by the flue gas-water heat exchanger assembly within 5 units of time through regulation The heat generated by the component 5 flows through the phase change heat accumulator component 6 to melt the phase change material of the phase change heat accumulator component 6 and store the heat in the phase change heat accumulator component 6; when the heat load is higher than the flue gas- When the heat provided by the water heat exchanger assembly 5 per unit time, the low-temperature return water that regulates the heat load flows through the phase change heat accumulator assembly 6 to solidify the liquid phase change material, and the heat stored in the phase change heat accumulator assembly 6 is supplied to the heat load. An active energy storage and regulation distributed energy system of the present invention can make power supply and cooling supply by cooperatively regulating the input or output power of the electrical storage component 2, the phase change cold storage component 4, and the phase change heat storage component 6. and heat supply to further meet the changing demands of users.

Specifically, the temperature of the waste heat flue gas flowing out from the gas turbine generating set 1 is 240° C. to 450° C.; the temperature of the waste heat flue gas flowing out from the absorption refrigerator assembly 3 is 100° C. to 200° C.

According to the control method of the distributed energy system with active energy storage control of the present invention, when the electric load is lower than the power generated by the generator, the storage unit 2 is regulated to store excess electric energy; when the electric load is higher than the power generated by the generator, Regulating the accumulator component 2 to supply power to the electric load; when the cooling load is lower than the cooling capacity provided by the absorption refrigerating machine component 3 per unit time, regulating the refrigerating capacity generated by the absorption refrigerating machine component 3 flowing through the phase change cold storage component 4, Make the phase change material of the phase change regenerator assembly 4 phase change and solidify, and store the cooling capacity in the phase change regenerator assembly 4; when the cooling load is higher than the cooling capacity provided by the absorption refrigerator assembly 3 per unit time, control the cooling load The high-temperature return water flows through the phase change regenerator assembly 4 to melt the solid phase change material, and supply the cold energy stored in the phase change regenerator assembly 4 to the cooling load; when the heat load is lower than the flue gas-water heat exchanger assembly 5 units When the heat provided in the time is controlled, the heat generated by the flue gas-water heat exchanger assembly 5 flows through the phase change heat accumulator assembly 6 to make the phase change material of the phase change heat accumulator assembly 6 phase change and melt, and the heat is stored in the phase Variable heat accumulator assembly 6; when the heat load is higher than the heat provided by the flue gas-water heat exchanger assembly 5 per unit time, the low-temperature return water that regulates the heat load flows through the phase change heat accumulator assembly 6 to make the liquid phase change material Solidification, the heat stored in the phase change heat accumulator assembly 6 is supplied to the heat load. The control method of the distributed energy system of the active energy storage control of the present invention, through the control of the active energy storage control of the distributed energy system, the power supply, cooling and heating of the energy system can always meet the requirements of cold, heat, electricity The dynamic change of the load can optimize the performance of the system in all working conditions and coordinate the output ratio of cooling, heating and electricity, realize efficient and reliable operation of the system in all working conditions, and can greatly improve the economic benefits of system operation.

Embodiment two.

As shown in Figure 2, the difference between this embodiment and the first embodiment is that it also includes a heat exchanger assembly 7, which is connected in parallel with the absorption refrigerating machine assembly 3 to the conveying pipeline of waste heat flue gas, and the heat The heat exchanger assembly 7 absorbs heat from the waste heat flue gas to preheat the fuel of the gas turbine generator set 1 , and the fuel flows through the heat exchanger assembly 7 before entering the gas turbine generator set 1 . By preheating the fuel with the waste heat flue gas, the reuse of the waste heat flue gas is realized, the power generation efficiency of the gas turbine generator set 1 is improved, and the power supply capacity is improved; when the electricity demand increases, the heat exchanger assembly 7 is adjusted to make the A relatively high proportion of waste heat flue gas is used to preheat fuel to increase the power generation capacity of the gas turbine generator set 1, and at the same time, control the coordinated regulation of the accumulator assembly 2 to meet the demand of the electric load.

Specifically, it also includes a first three-way valve 8 and a second three-way valve 9. The first three-way valve 8 is arranged between the gas turbine generator set 1 and the absorption refrigeration machine assembly 3, and the second three-way valve 9 is arranged between the absorption refrigeration machine assembly 3. Between the type refrigerator assembly 3 and the flue gas-water heat exchanger assembly 5, both ends of the heat exchanger assembly 7 communicate with the first three-way valve 8 and the second three-way valve 9 respectively. The heat exchanger assembly 7 of the present invention is connected in parallel with the absorption refrigerating machine assembly 3, which is convenient for regulation.

In addition, a distributed energy system with active energy storage regulation of the present invention can coordinately regulate the gas turbine generator set 1, the heat exchanger assembly 7, the absorption refrigerator assembly 3, the electrical storage assembly 2, and the phase change cold storage The heat storage unit 4 and the phase change heat storage unit 6 realize more reasonable utilization of energy, balance the supply and demand of cold, heat and electricity, and can not only meet the dynamic changes of cold, heat and electricity loads, but also keep the energy supply system working at full capacity. Efficient operation can also reduce the installed capacity of the unit.

For the rest of the features of this embodiment, refer to the explanation of Embodiment 1, and will not be repeated here.

To sum up, it can be known that the present invention has the above-mentioned excellent characteristics, which enables it to improve the performance that is not available in the prior art in use, and has practicability, and becomes a product with great practical value.

The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. limits.

Claims (7)

1. a distributed energy resource system for actively accumulation of energy regulation and control, including Gas Turbine Generating Units (1), it is characterised in that: also Including electric storage means assembly (2), absorption refrigeration unit part (3), phase-change cold-storage device assembly (4), gas-water heat exchanger assembly (5)； The waste heat flue gas that Gas Turbine Generating Units (1) produces flows through absorption refrigeration unit part (3), gas-water heat exchanger package successively Part (5)；Power load end (11) is in parallel with electric storage means assembly (2) and all electrically connects with Gas Turbine Generating Units (1)；With cold negative Lotus end (12) is in parallel with phase-change cold-storage device assembly (4) and is all connected with absorption refrigeration unit part (3)；Gas-water heat exchanger package Part (5) is connected with thermic load end.

The distributed energy resource system of a kind of active accumulation of energy the most according to claim 1 regulation and control, it is characterised in that: also include phase Become storage heater assembly (6), phase change heat accumulator assembly (6) in parallel with described thermic load end and all with gas-water heat exchanger assembly (5) connect.

The distributed energy resource system of a kind of active accumulation of energy the most according to claim 1 regulation and control, it is characterised in that: from described combustion The temperature of the waste heat flue gas that gas-turbine generating set (1) flows out is 240 DEG C ~ 450 DEG C；Flow out from absorption refrigeration unit part (3) The temperature of waste heat flue gas be 100 DEG C ~ 200 DEG C.

The distributed energy resource system of a kind of active accumulation of energy the most according to claim 1 regulation and control, it is characterised in that: described phase transformation The freezing point of the phase-change material for cold storage of regenerator assembly (4) is 7 DEG C ~ 10 DEG C.

The distributed energy resource system of a kind of active accumulation of energy the most according to claim 1 regulation and control, it is characterised in that: also include heat Interchanger assembly (7), heat exchanger assemblies (7) and described absorption refrigeration unit part (3) are parallel to the conveying pipe of waste heat flue gas Road, heat exchanger assemblies (7) is used for the fuel of preheated fuel gas turbine generator group (1) from waste heat smoke absorption heat, and fuel enters Heat exchanger assemblies (7) is first flowed through before entering Gas Turbine Generating Units (1).

The distributed energy resource system of a kind of active accumulation of energy the most according to claim 5 regulation and control, it is characterised in that: also include the One triple valve (8) and the second triple valve (9), the first triple valve (8) is arranged at Gas Turbine Generating Units (1) and absorption refrigeration Between thermomechanical components (3), the second triple valve (9) be arranged at absorption refrigeration unit part (3) and gas-water heat exchanger assembly (5) it Between, the two ends of heat exchanger assemblies (7) connect with the first triple valve (8), the second triple valve (9) respectively.

7. the regulation and control method of the distributed energy resource system of active accumulation of energy regulation and control, it is characterised in that: when electric load is less than generating During machine generated output, regulation and control electric storage means assembly (2) store unnecessary electric energy；When electric load is higher than electrical power generators power, adjust Control electric storage means assembly (2) is that electric load is powered；

When the cold provided in refrigeration duty is less than absorption refrigeration unit part (3) unit interval, regulate and control absorption refrigeration unit The cold that part (3) produces flows through phase-change cold-storage device assembly (4) so that the phase-change material phase transformation solidification of phase-change cold-storage device assembly (4), Cold is stored in phase-change cold-storage device assembly (4)；There is provided within refrigeration duty is higher than absorption refrigeration unit part (3) unit interval During cold, the high-temperature tempering of regulation and control refrigeration duty flows through phase-change cold-storage device assembly (4) makes the phase-change material of solid-state melt, and phase transformation is stored The cold that cooler assembly (4) stores is supplied in refrigeration duty；

When the heat provided in thermic load is less than gas-water heat exchanger assembly (5) unit interval, regulate and control gas-water heat exchanger The heat that assembly (5) produces flows through phase change heat accumulator assembly (6) makes the phase-change material phase transformation of phase change heat accumulator assembly (6) melt, By heat storage in phase change heat accumulator assembly (6)；There is provided within thermic load is higher than gas-water heat exchanger assembly (5) unit interval Heat time, the low-temperature return water of regulation and control thermic load flows through phase change heat accumulator assembly (6) and makes the phase-change material of liquid solidify, by phase transformation The heat that storage heater assembly (6) stores is supplied in thermic load.