Combustion engine high-temperature heat pump combined cycle system

Abstract

The invention discloses a gas turbine high-temperature heat pump combined cycle system which comprises a gas turbine module, normal-temperature and normal-pressure air enters a gas compressor to be boosted and then enters a combustion chamber, and high-temperature and high-pressure gas pushes a turbine to do work; the waste heat exchanger module is used for carrying out heat exchange on the high-temperature gas tail gas generated by the gas turbine module and heating water on the other side to high-temperature water or high-temperature steam; the working medium evaporator module exchanges heat between a low-temperature heat source and a refrigerant in a loop through a working medium in an evaporator, so that the working medium evaporates and absorbs heat; the heat pump compressor module is used for pressurizing the evaporated working medium, increasing the temperature of the working medium and conveying the high-temperature and high-pressure working medium to a condenser; the working medium condenser module exchanges heat between the high-temperature and high-pressure working medium and water on the other side of the loop, releases heat and condenses the working medium into liquid; and an expansion valve module. Heat energy of the gas turbine and the heat pump can be utilized at the same time, the energy utilization efficiency is improved to the maximum extent, and carbon emission is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of industrial energy, and particularly relates to a gas turbine high-temperature heat pump combined cycle system. BACKGROUND

[0002] Low-grade industrial waste heat refers to low-temperature and low-grade waste heat energy generated in the industrial production process. The waste heat usually exists in the form of flue gas, wastewater, waste gas and the like, and the temperature is generally below 100 DEG C. Low-grade industrial waste heat is one of the main types of waste heat generated in the industrial production process, and various industries, such as metallurgy, chemical industry, textile, electric power and building materials, generate a large amount of low-grade waste heat resources. Therefore, the market of low-grade industrial waste heat has great potential and broad development space.

[0003] Although the utilization of low-grade industrial waste heat has made certain progress at present, it still faces some problems including technical maturity, investment cost, stability and the like. SUMMARY

[0004] To solve the above technical problems, one technical scheme adopted by the application is as follows:

[0005] The gas turbine high-temperature heat pump combined cycle system comprises the following modules:

[0006] The gas turbine module: normal temperature and pressure air enters the compressor for pressure boosting, and then enters the combustion chamber, and the high-temperature and high-pressure gas drives the turbine to work;

[0007] The waste heat exchanger module: the high-temperature gas tail gas generated by the gas turbine module is exchanged to heat the water on the other side, and the temperature is raised to high-temperature water or high-temperature steam;

[0008] The working medium evaporator module: the low-temperature heat source exchanges heat with the refrigerant in the circuit through the working medium in the evaporator, so that the working medium evaporates and absorbs heat;

[0009] The heat pump compressor module: the evaporated working medium is boosted and heated, and the high-temperature and high-pressure working medium is delivered to the condenser;

[0010] The working medium condenser module: the high-temperature and high-pressure working medium exchanges heat with the water on the other side of the circuit, releases heat, and the working medium condenses into liquid;

[0011] The expansion valve module: the liquid working medium is depressurized, and the valve opening degree can be fed back through the circuit temperature.

[0012] Further, the low-temperature heat source is waste heat or geothermal heat, wherein the waste heat is industrial low-grade waste heat, and the temperature of the waste heat is 40-100 DEG C.

[0013] Further, the heat pump compressor module and the gas turbine module are coaxially driven.

[0014] Further, the power level of the gas turbine is matched based on the amount of low-temperature heat source on the heat pump side to drive the high-temperature heat pump compressor.

[0015] Further, the refrigerant is a hydrofluorocarbon compound or a hydrofluoroolefin compound.

[0016] Further, in the working medium condenser module, the water on the other side is heated to high-temperature water or high-temperature steam.

[0017] Further, in the working medium condenser module, the condensed working medium is depressurized by a throttle valve and returned to the evaporator for the next heat exchange process.

[0018] Further, the working medium evaporator module and the exhaust heat exchanger of the gas turbine module are multi-stream coiled tube heat exchangers.

[0019] The beneficial effects of the present application are:

[0020] 1. Efficient energy utilization: The gas turbine high-temperature heat pump combined cycle can simultaneously utilize the heat energy of the gas turbine and the heat pump, maximizing energy utilization efficiency. The high-temperature waste heat generated by the gas turbine can be used in the heat pump cycle in stages for heat recovery and reuse, reducing energy waste.

[0021] 2. Good heat pump warming effect: The heat pump in the gas turbine high-temperature heat pump combined cycle can raise low-temperature heat energy to a high-temperature level, with good heat pump warming effect, which makes the heat pump applicable to a wider range of fields, such as industrial processes requiring high-temperature heat energy, providing a feasible solution.

[0022] 3. System flexibility: The gas turbine high-temperature heat pump combined cycle system has high flexibility, which can adjust and control the operation mode of the gas turbine and the heat pump according to actual needs, realizing flexible supply of heat energy, making the system adaptable to different loads and operating conditions. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of the combined cycle system of the present application.

[0024] The parts in the drawings are marked as follows:

[0025] 1. Gas turbine module; 2. Waste heat exchanger module; 3. Working medium evaporator module; 4. Heat pump compressor; 5. Working medium condenser; 6. Expansion valve module. DETAILED DESCRIPTION

[0026] The advantages and features of the present application can be more easily understood by those skilled in the art from the following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, where:

[0027] Embodiment 1:

[0028] As shown in the figure, a combined cycle system of gas engine and high temperature heat pump mainly includes two cycles: Figure 1

[0029] The gas engine cycle part includes:

[0030] Gas engine module 1: air at normal temperature and pressure enters the compressor for pressure increase, and then enters the combustion chamber, and high temperature and high pressure gas drives the turbine to work. The power level of the gas engine can be matched and selected based on the amount of low temperature heat source on the heat pump side, and can only drive the high temperature heat pump compressor, or can drive while the remaining power is generated;

[0031] Waste heat exchanger module 2: high temperature gas exhaust first enters the heat exchanger for heat exchange, heating the water on the other side to high temperature water or high temperature steam;

[0032] Based on the state of the low temperature heat source on the heat pump side, it is determined whether the exhaust after the heat exchanger can be further recycled.

[0033] The heat pump cycle part includes:

[0034] Working medium evaporator module 3: the high temperature heat pump receives low temperature heat source, such as waste heat or geothermal heat. The low temperature heat source exchanges heat with the refrigerant in the working medium in the evaporator, so that the working medium evaporates and absorbs heat;

[0035] Heat pump compressor 4 module: the evaporated working medium is pressurized by the compressor to increase its temperature, and the high temperature and high pressure working medium is delivered to the condenser, and the compressor is driven by the gas engine;

[0036] Working medium condenser 5 module: in the condenser, the high temperature and high pressure working medium exchanges heat with the water on the other side, releases heat, and the working medium condenses into liquid. The water on the other side is heated to high temperature water or high temperature steam;

[0037] The condensed working medium is depressurized by the throttling valve and returns to the evaporator for the next heat exchange process.

[0038] Expansion valve module 6: depressurize the liquid working medium, and the valve opening can be adjusted through the temperature feedback of the circuit.

[0039] The evaporator and the gas exhaust heat exchanger can be designed as a multi-flow high efficiency coiled tube heat exchanger, which has small floor area and small heat exchange end difference, and can further improve the heat pump efficiency. The combined cycle COP can reach at least 3. ​

[0040] The above merely illustrates the embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural transformation, or direct or indirect application in other related technical fields, made according to the content of the present application specification and drawings, are also included in the patent protection scope of the present application.

Claims

1. A gas turbine high-temperature heat pump combined cycle system, characterized in that: Includes the following modules: Gas turbine module (1): At normal temperature and pressure air enters the compressor to increase pressure, and then enters the combustion chamber. The high temperature and high pressure gas drives the turbine to do work; Waste heat exchanger module (2): The high-temperature exhaust gas generated by the gas turbine module (1) is exchanged for heat to heat the water on the other side, raising the temperature to high-temperature water or high-temperature steam. Working fluid evaporator module (3): The low-temperature heat source exchanges heat with the refrigerant in the circuit through the working fluid in the evaporator, so that the working fluid evaporates and absorbs heat; Heat pump compressor (4) module: pressurizes and heats the evaporated working fluid, and delivers the high-temperature and high-pressure working fluid to the condenser; Working fluid condenser (5) module: It exchanges heat between the high-temperature and high-pressure working fluid and the water on the other side of the circuit, releasing heat and condensing the working fluid into a liquid; Expansion valve module (6): reduces the pressure of the liquid working fluid and controls the valve opening through loop temperature feedback.

2. The gas turbine high-temperature heat pump combined cycle system according to claim 1, characterized in that: The low-temperature heat source is waste heat or geothermal energy, wherein the waste heat is low-grade industrial waste heat, and the temperature of the waste heat is 40-100℃.

3. The gas turbine high-temperature heat pump combined cycle system according to claim 1, characterized in that: The heat pump compressor (4) module is coaxially driven with the gas turbine module (1).

4. The gas turbine high-temperature heat pump combined cycle system according to claim 1, characterized in that: The power rating of the gas turbine is selected based on the amount of low-temperature heat source on the heat pump side.

5. The gas turbine high-temperature heat pump combined cycle system according to claim 1, characterized in that: The refrigerant is a hydrofluorocarbon compound or a hydrofluoroolefin compound.

6. The gas turbine high-temperature heat pump combined cycle system according to claim 1, characterized in that: In the working fluid condenser (5) module, the water on the other side is heated to high temperature water or high temperature steam.

7. A gas turbine high-temperature heat pump combined cycle system according to claim 1, characterized in that: In the working fluid condenser (5) module, the condensed working fluid is depressurized through a throttling valve and returned to the evaporator to cycle through the next heat exchange process.

8. A gas turbine high-temperature heat pump combined cycle system according to claim 1, characterized in that: The exhaust gas heat exchangers of the working fluid evaporator module (3) and the gas turbine module (1) are multi-stream tube heat exchangers.

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