CN102563970A - Alternating-current and gas engine parallel dual-drive heat pump device - Google Patents

Abstract

The invention discloses an alternating current and gas engine parallel double-drive heat pump device, which includes a heat pump unit, an alternating current motor, a gas engine, and a transmission unit; The input end of the transmission unit is connected; the input end of the heat pump unit is connected to the output end of the transmission unit through a heat pump clutch. The invention adopts the combination of the urban AC power network and the gas engine technology, the driving motor of the urban AC power network can not only play the role of balancing load changes, but also because the electric drive part is directly connected to the urban AC power grid, it can realize long-term driving when gas is in short supply Unit operation; six different working and operating modes can be realized, which can improve the utilization of primary energy and relatively reduce carbon emissions.

Description

AC and gas engine parallel dual drive heat pump device

technical field

The invention relates to a heat pump device in the field of hybrid power, in particular to a parallel dual-drive heat pump device with alternating current and gas engine.

Background technique

Although the annual production capacity of household air conditioners in my country ranks first in the world, the cost has dropped rapidly and its technical level has also been greatly improved. However, my country is a developing country with a large population, rapid economic development, and a relatively weak power base. The single development of electric air conditioning has brought a series of consequences:

First, further increase the peak power load in summer, making the power supply tense in summer. Due to the characteristics of intermittent operation and short operation time of residential air conditioners in our country, the characteristics of electric load are further deteriorated.

Second, household air conditioners have some insurmountable disadvantages: low efficiency ratio. Its energy efficiency ratio is generally 2.7 ~ 3.1, and the primary energy utilization rate is only 0.8 ~ 1.0. Due to cost constraints, it is difficult to greatly improve the energy efficiency ratio of household air conditioners; the fastest-growing split-type air conditioners do not have fresh air devices, and the indoor air quality cannot be guaranteed. The living environment has different influences.

In short, when the contradiction between the growth of air-conditioning power consumption and power supply, power grid security, and economic benefits of power companies develops to a certain extent, it will inevitably lead to very serious consequences. To avoid similar crises in China, the energy consumption of residential air-conditioning is worth thinking about. It is imminent to develop other forms of air-conditioning.

The gas heat pump is a vapor compression heat pump device that mainly uses gas as energy and is driven by a gas engine, and can make full use of the waste heat of the engine cylinder liner, flue gas waste heat and low-grade ambient heat to achieve high-efficiency air-conditioning heating for heating in winter and cooling in summer device. Compared with other heating (cooling) devices, gas heat pumps have the following advantages:

First, to ease the power supply pressure of the urban power grid and balance the seasonal peaks and valleys of gas. Summer is the peak of electricity consumption in cities, and the power consumption of air conditioners in summer accounts for a large part of it. Every summer, there will be insufficient power supply and power cuts in our country. At the same time, due to the hot weather in summer, the gas consumption for residents' domestic use has also dropped significantly, and the load rate of the pipeline network is low. This has created favorable conditions for the development of gas air conditioners.

Second, the development of gas heat pumps helps to optimize the energy structure and is conducive to the comprehensive utilization of energy. At present, my country's primary energy consumption has always been dominated by coal, and there is a big gap between the composition of energy consumption structure and the world average energy consumption structure with coal accounting for 27%, oil accounting for 40% and natural gas accounting for 24%.

Third, the operation efficiency is high, and the utilization rate of primary energy is high. The primary energy utilization rate of the gas heat pump is about 0.9 when the gas heat pump is running at full load, and the primary energy utilization rate of the system with waste heat recovery is close to 1.45, which is much higher than that of the absorption type. At the same time, the operating cost and payback period are mainly related to the local gas-to-electricity price ratio, and its advantages are more prominent in areas where the electricity load and price are relatively high and the gas price is relatively stable and low.

However, in the actual process of heat pump operation, the user heat pump load is constantly changing due to the influence of the outdoor environment, indoor environment or other factors, and the fluctuation range of the user heat pump load is large. For conventional gas heat pump systems, it is difficult to keep the engine working in the operating economic zone, and the engine often runs at low or high speed ranges, resulting in a decrease in the overall performance coefficient and increased emissions of conventional gas heat pump systems, which is not conducive to energy saving Environmental friendly.

Contents of the invention

The technical problem to be solved by the present invention is the part-load operation and idling phenomenon when a single gas engine drives a heat pump, and the large power consumption problem of a single electric-driven air-conditioning heat pump system.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: an AC power, gas engine parallel double-drive heat pump device, including a heat pump unit, an AC motor, a gas engine, and a transmission unit; the power input end of the AC motor is AC power, and the power output end passes through The clutch of the AC motor is connected to the transmission unit; the gas engine is connected to the city gas pipeline network through a pressure reducing and stabilizing device; the power output end is connected to the input end of the transmission unit through the gas engine clutch; the power input end of the heat pump unit is connected to the output of the drive unit.

The present invention uses two energy systems to complement the advantages of 220V AC-driven air conditioners and gas heat pump air conditioners. While realizing the high-efficiency operation of the gas engine heat pump, the heat pump device operates more stably. If there is a power failure or power shortage, The device can be driven by a gas engine; and when the gas supply is tight or there is a problem with the gas pipeline network, 220V AC can be used to power the entire system through the AC motor. The power drive part of the device can realize three operating conditions: 220V AC drives the entire system alone, gas engine drives alone, and AC and gas engine drive the system together; six different operating states can be realized: 1) AC drives refrigeration 2) Gas engine driven cooling mode, 3) AC and gas engine jointly driven cooling mode, 4) AC driven heating mode, 5) Gas engine driven heating mode, 6) AC and gas engine jointly driven heating mode.

In order to ensure that the cylinder liner temperature is in an appropriate temperature range when the gas engine is running, and to further improve energy utilization, a waste heat recovery device is also provided. The waste heat recovery device includes a circulating water pump, an air radiator, a plate heat exchanger, and a flue gas heat exchanger. , centrifugal water pump, heat preservation water tank, water storage tank, tap water control valve, all the aforementioned components are connected through pipelines; circulating water pump, plate heat exchanger and air radiator are connected in sequence, and the air radiator and circulating water pump The connecting pipeline passes through the inside of the gas engine shell; the water storage tank, centrifugal water pump, flue gas heat exchanger, plate heat exchanger, and heat preservation water tank are connected in sequence, and the flue gas heat exchanger is connected to the gas engine, and the water storage tank passes through the tap water control valve Connect with city water pipe network.

There are two advantages of adding a waste heat recovery device, one is to heat the circulating water after recovering waste heat to provide domestic hot water, and the other is to ensure the operating temperature of the engine. The engine cylinder liner cooling water temperature affects the cooling efficiency of the engine, the heat load of high-temperature parts, the heat distribution and energy utilization of the engine, if the water temperature is not appropriate, it will cause the engine to run too cold or overheated, the mixture will not burn normally, and the wear of the parts will increase. reduce engine power. Adding a waste heat recovery device is beneficial to prolong the service life of the whole device.

As an improved solution of the present invention, the transmission unit includes a belt, a main pulley and a slave pulley, the belt is wound on the master pulley and the slave pulley, the master pulley is a power input end, and the slave pulley is a power output end.

As an improved solution of the present invention, the aforementioned heat pump unit includes a compressor, a four-way steering valve, a throttling mechanism, and two sets of evaporative condensers; the power input end of the compressor is connected to the compressor clutch, and at the same time, the compressor passes The steering valve is respectively connected with two sets of evaporative condensers; the two sets of evaporative condensers are communicated through a throttling mechanism.

The advantages of the present invention are: the parallel hybrid technology is applied to the combination of the traditional electric drive heat pump and the gas heat pump, and the urban AC pipe network is combined with the gas engine technology, and the driving motor of the urban AC pipe network can not only play a role in balancing load changes At the same time, because the electric drive part is directly connected to the urban AC power grid, it can realize the long-term operation of the drive unit when the gas is in short supply; it can realize six different working modes: 1) AC drive cooling mode, 2) gas engine drive cooling mode , 3) Cooling mode driven by AC and gas engine, 4) Heating mode driven by AC power, 5) Heating mode driven by gas engine, 6) Heating mode driven by AC and gas engine; At the same time, in the case of changing demand load Under the circumstances, the gas engine has two working states, one is shut down, and the other is running in the economical area of the gas engine. Thereby, the utilization of primary energy can be improved, and carbon emissions can be relatively reduced.

Description of drawings

Figure 1 is a schematic structural view of the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Figure 1, the present invention includes a power distribution system, a heat pump unit and a waste heat recovery device;

The aforementioned power distribution system includes an AC motor 1, a gas engine 2, a belt 6, a main pulley 5-1, and a slave pulley 5-2; The AC motor clutch 3 is connected to the main pulley 5-1; the power input end of the gas engine 2 is connected to the city gas network through the control valve 21, and the power output end of the gas engine 2 is connected to the main pulley 5-1 through the gas engine clutch 4.

The aforementioned heat pump unit includes a compressor 8, a four-way steering valve 9, a throttling mechanism 11, and two sets of evaporative condensers 10; the power input end of the compressor 8 is connected to the slave pulley 5-2 through a compressor clutch 7. The compressor is respectively connected to two sets of evaporative condensers 10 through a four-way steering valve 9; the two sets of evaporative condensers 10 are connected through a throttle mechanism 11. Belt 6 is wound on main belt pulley 5-1, from belt pulley 5-2.

The aforementioned waste heat recovery device includes a circulating water pump 12, an air radiator 13, a plate heat exchanger 14, a flue gas heat exchanger 15, a centrifugal water pump 16, an insulating water tank 17, a water storage tank 18, and a tap water control valve 19. It is communicated through pipelines; wherein, the circulating water pump 12, the air radiator 13 and the plate heat exchanger 14 are sequentially connected in circulation, and the connecting pipeline between the circulating water pump 12 and the air radiator 13 passes through the casing of the gas engine 2 for controlling The operating temperature of the gas engine 2; the flue gas heat exchanger 15, the plate heat exchanger 14, the heat preservation water tank 17, the water storage tank 18, and the centrifugal water pump 16 are sequentially connected in circulation, and the flue gas heat exchanger 15 is connected with the gas engine 2, and the recovery Utilizing the heat in the high-temperature flue gas produced when the gas engine 2 works, the tap water control valve 19 is connected with the water storage tank 18 for injecting tap water into the water storage tank 18 . When the circulating water in the heat preservation water tank 17 gradually heats up under the effect of heat conduction, hot water can be provided for users.

The use state of the present invention is as follows:

1. Electric drive mode:

In this mode, the switch 20 is closed, and the urban power supply network supplies power to the AC motor 1, so that the AC motor clutch 3 is closed, and the power output shaft of the AC motor 1 drives the AC motor clutch 3 to rotate, thereby further driving the main pulley 5-1 to rotate , the belt 6 starts to drive, and the slave pulley 5-2 rotates synchronously, and the slave pulley 5-2 drives the compressor clutch 7 to rotate, so that the compressor starts to work, and realizes cooling in summer and heating in winter. The structure and working principle of the aforementioned heat pump unit are all in the prior art.

In addition, in this mode, the control valve 21 is closed, the city gas pipeline network does not provide fuel supply to the gas engine 2, the gas engine clutch 4 is in a disengaged state, and the waste heat recovery device does not work.

In this working mode, the load of the entire system is provided by AC power, and the gas engine is in a shutdown state. It is mainly used in situations where the power supply is sufficient and the cooling load is small, or the heat load is small or the gas supply of the urban gas pipeline network is tight.

2. Gas engine driving mode

In this mode, the control valve 21 is opened, the city gas pipeline network provides fuel supply to the gas engine 2, the output shaft of the gas engine 2 drives the gas engine clutch 4 to rotate, thereby further driving the main pulley 5-1 to rotate, the belt 6 starts to drive, and Make the slave pulley 5-2 rotate synchronously, drive the compressor clutch 7 to rotate from the pulley 5-2, make the compressor start to work, and realize cooling and heating. At this time, the waste heat recovery device operates to recover waste heat. The waste heat recovery device can ensure the operating temperature of the gas engine and provide domestic hot water at the same time.

In addition, in this mode, the switch 20 is turned off, and the urban power supply network does not supply power to the AC motor 1. At this time, the AC motor clutch 3 is also in a disengaged state, the AC motor is in a shutdown state, and the entire system is driven by the gas engine.

This working mode is suitable for cooling conditions where electricity is tight in summer and gas is relatively surplus, or heating is required in winter.

3. Common driving mode

The urban power supply network and the gas pipeline network provide energy supply to the system at the same time, the AC motor and the gas engine work together to output power to the compressor, and the waste heat recovery system ensures the operating temperature of the gas engine. The co-driven cooling mode can be used when the cooling load needs to be very high during the hot summer. This working mode can also be used when the cooling load required by the system is not in the optimal operating economic zone of the gas engine, and the AC motor is used to balance part of the required load to realize the efficient operation of the gas engine.

The common driving mode is to jointly drive the compressor to run by the AC motor and the gas engine in parallel, and this working mode can be used when the required heat load is large or the gas engine is not in the optimal operating economical area.

Claims (4)

1. alternating current, the two heat pump assemblies that drive of gas engine parallel connection is characterized in that: comprise heat pump unit, alternating current generator, gas engine, gear unit;

The power intake of alternating current generator is an alternating current, and clutch end is connected with gear unit through the alternating current generator clutch; Gas engine is connected with pipeline network of fuel gas in city through the decompression stable-pressure device, and clutch end is connected with the input of gear unit through the gas engine clutch;

The power intake of heat pump unit connects the output of gear unit through compressor clutch.

2. alternating current according to claim 1, the two heat pump assemblies that drive of gas engine parallel connection; It is characterized in that: also be provided with waste heat recovery plant; Waste heat recovery plant comprises water circulating pump, air radiator, plate type heat exchanger, flue gas heat exchange device, centrifugal water pump, attemperater, storage tank, running water control valve, all is communicated with through pipeline between aforementioned each element; Water circulating pump, plate type heat exchanger and air radiator circulate in order and are connected, and are connected pipeline through the gas engine enclosure interior between air radiator and the water circulating pump; Storage tank, centrifugal water pump, flue gas heat exchange device, plate type heat exchanger, attemperater pipeline in order connect, and the flue gas heat exchange device is connected with gas engine, and storage tank passes through the running water control valve and is connected with the city tap-water pipe network.

3. alternating current according to claim 1 and 2, the two heat pump assemblies that drive of gas engine parallel connection; It is characterized in that: said gear unit comprises belt, main pulley and from belt pulley; The belt solderless wrapped connection is at main pulley, from belt pulley, and main pulley is an input, is output from belt pulley.

4. alternating current according to claim 1 and 2, the two heat pump assemblies that drive of gas engine parallel connection, it is characterized in that: aforementioned heat pump unit comprises compressor, four-way switching valve, throttle mechanism and two groups of evaporative condensers; The compressor operating required drive is provided by alternating current generator or gas engine through gear unit, and compressor connects two groups of evaporative condensers respectively through the four-way switching valve; Be communicated with through throttle mechanism between two groups of evaporative condensers.

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