CN202081927U - Low temperature Rankine double cycle power generation device - Google Patents

Abstract

A new energy low-temperature Rankine double-cycle power generation device is provided with two closed cycle power generation systems; the working medium absorbs heat through the heat absorber and then flows to the compressor, the condenser, the working medium pump, the evaporator, the expansion generator set and the heat exchanger in sequence to form a first closed cycle power generation system; secondly, the other working medium sequentially passes through a condenser, an expansion generator set, a heat exchanger and a working medium pump to form a second closed cycle power generation system; the heat absorber and the evaporator can absorb low-temperature heat energy in air and water, and a high-temperature high-pressure working medium in the first closed circulating power generation system exchanges heat with a liquid working medium in the second closed circulating system in the condenser; the low-temperature and low-pressure working medium in the first closed circulating power generation system exchanges heat with the low-temperature and low-pressure working medium in the second closed circulating system in the heat exchanger; the low-temperature thermal power generation system does not need a system external cold source, has high thermal efficiency, low investment and low cost, and successfully breaks through the technical difficulty of low thermal efficiency of the low-temperature thermal power generation system.

Description

Low temperature Rankine double cycle power generation device

technical field

The utility model relates to a new energy power generation device, in particular to a low-temperature Rankine double-cycle power generation device. the

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 electric energy utilization technologies are gaining more and more attention. Now, among new energy sources, solar power generation technologies such as hydropower and wind power, and direct utilization technologies of solar power generation—photovoltaic cells and mirror surface concentrating power generation technologies are quite mature; the development potential of hydropower generation is not great; and wind power and sunlight are too scattered. The direct use of wind power and solar power generation occupies a large area and requires a very high one-time investment. 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 power generation 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 power generation system and not be effectively used. It has high investment and low thermal efficiency. the

Contents of the invention

In order to overcome the disadvantages of high investment and low thermal efficiency of the existing heat pump type low-temperature thermal power generation device, the utility model provides a low-temperature Rankine double-cycle power generation device. The low-temperature Rankine double-cycle power generation device does not need an external cooling source and has high thermal efficiency. , Low investment and low cost. the

The technical scheme adopted by the utility model to solve the technical problem is: the low-temperature Rankine double-cycle power generation device mainly includes a heat absorber, a compressor, a condenser, a working medium pump, an evaporator, and an expansion generator set; Connected pipelines, accessories and detection and control devices, it has two closed cycle power generation systems, and there are working fluids in the closed system. In the first closed cycle power generation system, the working fluid flows to the compressor after absorbing the heat energy in the air and water through the heat absorber, and the high temperature and high pressure working fluid compressed by the compressor flows to the condenser and the condensed liquid working fluid in the second closed cycle system. After mass heat exchange, the heat releases and condenses, and the condensed working medium is then pressed into the evaporator through the working medium pump. The evaporator can absorb the low-temperature environmental fluid—the heat energy in the air and water to heat the liquid working medium to become a high-pressure gaseous working medium, and then the high-pressure gaseous working medium Enter the expansion generator set to expand and generate power; the outlet of the expansion generator set is a low-temperature and low-pressure working fluid, which absorbs the heat energy of the low-temperature and low-pressure working medium in the second closed cycle system through a heat exchanger, and the heat-absorbed low-temperature and low-pressure working medium is then After the heat absorber further absorbs the heat energy in the air and water, it flows to the compressor, and the outlet pressure of the expansion generator set is determined by the inlet pressure of the compressor, thus forming the first closed cycle power generation system. In the second closed-cycle power generation system, the liquid working medium absorbs the heat energy of the high-temperature working medium in the first closed-cycle system through the condenser, heats and evaporates to become a high-pressure gaseous working medium, and then the high-pressure gaseous working medium enters the expansion generator set to expand and generate power; expansion The outlet of the generator set is a low-temperature and low-pressure working fluid, which is further exothermic and condensed in the heat exchanger, and the condensed working fluid is then pressed into the condenser by the working fluid pump, thus forming a second closed cycle power generation system. The compressor of the low-temperature Rankine double-cycle power generation device can also be a multi-stage compressor unit; and its primary compressor can also be directly connected to the outlet of the expansion generator set to maintain a low pressure at the outlet of the expansion generator set. The low-temperature Rankine double-cycle power generation device can also be connected between the main shaft of the expansion generator set and the main shaft of the compressor. The heat absorber and heat exchanger of the low-temperature Rankine double-cycle power generation device are high-efficiency heat pipe heat exchangers. The low-temperature Rankine double-cycle power generation device can also be installed on vehicles, ships and other mechanical equipment as a direct power device or a charging device. The low-temperature Rankine double-cycle power generation device can also be used for power generation with low-temperature heat sources such as waste heat and geothermal heat. The low-temperature Rankine double-cycle power generation unit produces cold air as a by-product. the

The beneficial effect of the utility model is that the low-temperature Rankine double-cycle power generation device does not need an external cooling source, and has high thermal efficiency, low investment and low cost. the

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described. the

Accompanying drawing is the working flow schematic diagram of the utility model embodiment. the

In the figure 1. Heat absorber, 2. Compressor, 3. Condenser, 4. Working medium pump, 5. Evaporator, 6. Expansion generator set, 7. Working medium pump, 8. Heat exchanger, 9. Expansion generator set. the

Detailed ways

In the embodiment shown in the drawings, the low-temperature Rankine double-cycle power generation device mainly includes a heat absorber (1), a compressor (2), a condenser (3), a working medium pump (4), and an evaporator (5) , expansion generator set (6), working medium pump (7), heat exchanger (8), expansion generator set (9); it also includes connected pipelines, accessories and detection and control devices in the system, it has two Closed cycle power generation system, there is working fluid in the closed system. In the first closed cycle power generation system, the working fluid flows to the compressor (2) after absorbing heat energy in the air and water through the heat absorber (1), and the high-temperature and high-pressure working fluid compressed by the compressor (2) flows to the condenser (3 ) exchanging heat with the condensed liquid working fluid in the second closed cycle system and then exothermic and condensing, the condensed working fluid is then pressed into the evaporator (5) through the working fluid pump (4), and the evaporator (5) can absorb the low-temperature ambient fluid— The heat energy in the air and water heats the liquid working medium to become a high-pressure gaseous working medium, and then the high-pressure gaseous working medium enters the expansion generator set (6) to expand and generate power; the outlet of the expansion generator set (6) is a low-temperature and low-pressure working medium, which then The heat exchanger (8) absorbs the heat energy of the low-temperature and low-pressure working medium in the second closed cycle system, and the heat-absorbing low-temperature and low-pressure working medium further absorbs the heat energy in the air and water through the heat absorber (1) and then flows to the compressor ( 2), the outlet pressure of the expansion generator set (6) is determined by the inlet pressure of the compressor (2), thus forming the first closed cycle power generation system. In the second closed-cycle power generation system, the liquid working medium absorbs the heat energy of the high-temperature working medium in the first closed-cycle system through the condenser (3), heats and evaporates to become a high-pressure gaseous working medium, and then the high-pressure gaseous working medium enters the expansion generator set (9 ) expands to generate power; the outlet of the expansion generating set (9) is a low-temperature and low-pressure working fluid, which is then further radiated and condensed in the heat exchanger (8), and the condensed working fluid is then pressed into the condensing fluid through the working fluid pump (7) device (3), thus forming a second closed-cycle power generation system. The compressor (2) of the low-temperature Rankine double-cycle power generation device can also be a multi-stage compressor unit; and its primary compressor can also be directly connected to the outlet of the expansion generator set to maintain a low pressure at the outlet of the expansion generator set. In the low-temperature Rankine double-cycle power generation device, the expansion generator unit (6), the main shaft of the expansion generator unit (9) and the main shaft of the compressor (2) can also be connected. The heat absorber (1) and the heat exchanger (8) of the low-temperature Rankine double-cycle power generation device are high-efficiency heat pipe heat exchangers. the

Claims (2)

1. the two circulation electric generating apparatus of low temperature Rankine mainly comprise heat absorber, compressor, condenser, working medium pump, vaporizer, the expansion power generation unit, heat exchanger, it also comprises the pipeline that is connected in the system, annex and detection and control gear, it has two closed circulation power generation systems, working medium is arranged in the closed system, it is characterized in that: heat absorber, compressor, condenser, working medium pump, vaporizer, the expansion power generation unit, heat exchanger is in turn connected to form the first closed circulation power generation system, condenser, the expansion power generation unit, heat exchanger, working medium pump is in turn connected to form the second closed circulation power generation system.

2. the two circulation electric generating apparatus of low temperature Rankine according to claim 1 is characterized in that: two circulation electric generating apparatus heat absorbers of this low temperature Rankine and heat exchanger all are the high-efficiency heat pipe heat exchangers.

3. the two circulation electric generating apparatus of low temperature Rankine according to claim 1 is characterized in that: the compressor of the two circulation electric generating apparatus of this low temperature Rankine is multistage compressors, and its primary compressor directly is connected the outlet of expansion power generation unit.

4. the two circulation electric generating apparatus of low temperature Rankine according to claim 1 is characterized in that: be connected between the two circulation electric generating apparatus expansion power generation set main shafts of this low temperature Rankine and the compressor main shaft.