CN102146814A - Supercritical low temperature air power generation device - Google Patents

Abstract

A new energy solar thermal supercritical low-temperature air energy power generation device. The system comprises a heat absorber, an expansion generator set, a heat regenerator, a cooler, a booster pump, a refrigerator, pipeline accessories thereof and a detection and control device, wherein nitrogen or mixed working medium is filled in a closed system. The working medium becomes high-pressure supercritical fluid through the heat absorber, becomes critical state working medium through the power generation of the expansion generator set, is condensed through the heat regenerator and the cooler, is pressed into the heat regenerator by the booster pump for heat exchange, and then enters the heat absorber for heat absorption to form a closed cycle power generation system. It can also be used for generating electricity by using waste heat, geothermal energy and other medium and low temperature heat sources, and the working medium is carbon dioxide or a mixed working medium. The supercritical low-temperature air energy power generation device produces cold air as a byproduct. It makes working medium condense in critical state, and has less heat release and cyclic utilization of condensation heat, so that it has high thermoelectric efficiency, high energy conversion density, low unit power investment, low cost and no power consumption of by-product cold air. The method successfully breaks through the key difficult technology of low thermal efficiency of low-temperature solar thermal power generation.

Description

Supercritical low temperature air power generation device

technical field

The invention relates to a new energy power generation device, in particular to a supercritical low-temperature air energy power generation device.

Background technique

Most of the energy on the earth comes from the sun, no matter wind energy, water energy, biomass energy or fossil energy - coal, oil, natural gas, combustible ice. In today's increasingly tense energy environment, new renewable, green and clean power generation technologies are receiving increasing attention. Now, among the new energy sources, solar power generation technologies such as hydropower and wind power, as well as direct utilization technologies of solar power generation—photovoltaic cells and mirror surface concentrating power generation technologies are quite mature; hydropower development potential is not great; and wind power and sunlight are too scattered, making The direct power generation devices of wind power and sunlight occupy a large area, and the one-time investment is extremely high. The earth's atmosphere is repeatedly absorbing and emitting the energy of solar radiation every day, and the environmental fluids that absorb solar heat energy—the solar heat energy in the air and water are renewed every day, which is almost inexhaustible. Thereby people are stepping up the study of new environmental fluids that indirectly utilize solar thermal energy—thermoelectric power generation technology in air and water. Among them, low-temperature solar thermal power generation technology is the most promising high-tech. At present, the known heat pump type low-temperature thermal power generation device adopts a heat pump system to enrich low-temperature solar heat energy in air and water, and then uses a Rankine cycle system to generate power. The heat pump system mainly includes compressors, condensers, throttles, and evaporators; the Rankine cycle system mainly includes condensers, circulating pumps, evaporators, and expansion generators. The heat pump low-temperature solar thermal power generation technology not only consumes energy for the operation of the heat pump, but also a large amount of heat consumed by the condenser of the Rankine cycle power generation system will flow out of the system and not be effectively used. It has high investment and low thermal efficiency.

Contents of the invention

In order to overcome the disadvantages of high investment and low thermal efficiency of the existing heat pump low-temperature thermal power generation device, the present invention provides a supercritical low-temperature air power generation device. The supercritical low-temperature air power generation device condenses the working medium in a critical state. Less heat is released, and condensation heat is recycled to achieve the goals of high thermoelectric efficiency, high energy conversion density, low investment per unit power, low cost, and no power consumption for by-product air-conditioning of supercritical low-temperature air power generation devices.

The technical solution adopted by the present invention to solve the technical problem is: the supercritical low-temperature air power generation device mainly includes a heat absorber, an expansion generator set, a heat regenerator, a cooler, a booster pump, and a refrigerator; Connected pipelines, accessories, and detection and control devices. There is a working fluid in the closed system, and the working fluid is nitrogen or a mixed working fluid. In the closed cycle power generation system, the working fluid absorbs the low-temperature ambient fluid through the heat absorber—the heat energy in the air and water to heat the liquid working medium to become a high-pressure supercritical fluid, and then the high-pressure supercritical fluid enters the expansion generator set to expand, cool down and depressurize to generate power; The outlet of the expansion generator set is the critical state working fluid, which is condensed into a liquid state through the heat release of the regenerator, further cooled by the cooler, and then pressed into the regenerator by the booster pump to absorb the critical state work at the outlet of the expansion generator set At the same time, the cold energy is transferred to the critical state working medium at the outlet of the expansion generator set and condensed; the preheated high-pressure working medium further absorbs the low-temperature environmental fluid through the heat absorber—the heat energy in the air and water to heat the liquid working medium Become a high-pressure supercritical fluid, and then flow to the expansion generator set; thus forming a closed cycle power generation system. The cooler is connected to the refrigerator through pipelines, and the refrigerator can also be replaced by natural or other artificial cooling sources. The heat absorber can adopt a micro-channel tubular high-efficiency heat exchanger. The regenerator can adopt the casing type high-efficiency heat exchanger. The cooler can adopt sleeve type high-efficiency heat exchanger. The booster pump can use a multi-stage diaphragm booster pump. The expansion engine is connected with the generator to form an expansion generator set, and the expansion engine can adopt a multi-stage screw expansion set. The main shaft of the expansion engine and the booster pump can be connected. The supercritical low-temperature air energy generating device can also be installed on vehicles, ships and other mechanical equipment as a direct power device or a charging device. The supercritical low-temperature air energy power generation device can also be used for power generation with waste heat, waste heat, geothermal and other medium and low temperature heat sources; carbon dioxide or mixed working fluid can be used for power generation with waste heat, waste heat, geothermal and other medium and low temperature heat sources. The supercritical low-temperature air power generation device produces cold air as a by-product. The starting power of the supercritical low-temperature air energy generating device uses storage battery or grid power, and the generated power is uploaded to the grid except for self-use.

The beneficial effect of the present invention is that the supercritical low-temperature air power generation device condenses the working fluid in a critical state, with less heat release, and the condensation heat is recycled, so that the supercritical low-temperature air power generation device has high thermal efficiency, high energy conversion density, The unit power investment is low, the cost is low, and the by-product air conditioner does not consume electricity.

Description of drawings

The present invention will be further described below in conjunction with drawings and embodiments.

Accompanying drawing is the workflow diagram of the embodiment of the present invention.

In the figure 1. Heat absorber, 2. Expansion generator set, 3. Regenerator, 4. Cooler, 5. Booster pump, 6. Refrigerator.

Detailed ways

In the embodiment shown in the drawings, the supercritical low-temperature air power generation device mainly includes a heat absorber (1), an expansion generator set (2), a heat regenerator (3), a cooler (4), and a booster pump ( 5) Refrigerator (6); it also includes connected pipes, accessories, and detection and control devices in the system. There is a working medium in the closed system, and the working medium is nitrogen or a mixed working medium. In the closed cycle system, the working fluid absorbs the low-temperature ambient fluid through the heat absorber (1)—the heat energy in the air and water heats the liquid working fluid to become a high-pressure supercritical fluid, and then the high-pressure supercritical fluid enters the expansion generator set (2) to expand and cool down Step-down power generation; the outlet of the expansion generator unit (2) is the critical state working fluid, which is condensed into a liquid state through the heat release of the regenerator (3), further cooled by the cooler (4), and then pumped by the booster pump ( 5) Press into the regenerator (3) to absorb the heat of the critical state working fluid at the outlet of the expansion generator set (2), and at the same time transfer the cold energy to the critical state working fluid at the outlet of the expansion generator set (2) and make it condense; The hot high-pressure working fluid passes through the heat absorber (1) to further absorb the low-temperature ambient fluid—the heat energy in the air and water to heat the liquid working medium to become a high-pressure supercritical fluid, and then flows to the expansion generator set (2); thus forming a closed cycle power generation system. The cooler (4) is connected with the refrigerator (6) through pipelines. The heat absorber (1) adopts a micro-channel tubular high-efficiency heat exchanger. The regenerator (3) adopts a casing type high-efficiency heat exchanger. The cooler (4) adopts a sleeve-type high-efficiency heat exchanger. The booster pump (5) adopts a multistage diaphragm booster pump. The expansion engine is connected with the generator to form an expansion generating unit (2), and the expansion engine adopts a multi-stage screw expansion unit.

Claims (5)

1. an overcritical Cryogenic air can mainly comprise heat absorber, expansion power generation unit, regenerator, cooler, suction booster, refrigerator by electricity generating device; It also comprises pipeline, annex and detection and the control gear that is connected in the system, it is characterized in that: heat absorber, expansion power generation unit, regenerator, cooler, suction booster, regenerator are in turn connected to form the closed circulation power generation system.

2. overcritical Cryogenic air energy electricity generating device according to claim 1 is characterized in that: this overcritical Cryogenic air energy electricity generating device expansion power generation unit outlet and suction booster outlet have regenerator.

3. overcritical Cryogenic air energy electricity generating device according to claim 1, it is characterized in that: the heat absorber of this overcritical Cryogenic air energy electricity generating device adopts micro passage tubular type high-performance heat exchanger, regenerator can adopt the sleeve-type efficient heat exchanger, cooler adopts the sleeve-type efficient heat exchanger, suction booster adopts multistage diaphragm booster pump, and the expansion motor adopts multi-stage screw expansion unit.

4. overcritical Cryogenic air according to claim 1 can electricity generating device, it is characterized in that: this overcritical Cryogenic air can electricity generating device expansion power generation set main shaft with the suction booster main shaft between also can be connected.

5. overcritical Cryogenic air according to claim 1 can electricity generating device, it is characterized in that: this overcritical Cryogenic air can electricity generating device also can be installed on car and boat and other machinery as direct driving force device or charging unit.

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