Direct-fired lithium bromide absorption heat pump unit with load balancing condenser

Abstract

The present invention relates to a direct-fired lithium bromide absorption heat pump unit with a load balancing condenser, comprising an absorber, a refrigerant pump, a solution pump, an evaporator, a solution heat exchanger, a direct-fired generator and a condenser, wherein the condenser comprises a first condenser and a second condenser, wherein the second condenser is used as a load balancing condenser, and a hot water electric three-way regulating valve is provided on the waste hot water inlet pipe of the unit. The present invention sets the second condenser as a load balancing condenser, and when the waste hot water inlet temperature or waste hot water flow rate of the unit is lower than the design parameter, the hot water electric three-way regulating valve is used to regulate and control part (or all) of the waste hot water to enter the load balancing condenser for heating and temperature rise, and at the same time, the fuel combustion amount is increased, and the load balancing condenser is used to transfer part of the heat generated by the fuel combustion to the evaporator, thereby increasing the waste hot water inlet temperature of the evaporator, and achieving a balance between the heat supply and the evaporator load, so that the unit can operate at full load and meet the heating demand.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioning equipment, and in particular to a direct-fired lithium bromide absorption heat pump unit with a load balancing condenser. Background Art

[0002] A conventional direct-fired single-effect lithium bromide absorption heat pump unit is Figure 1 As shown, the unit is composed of an evaporator 4, an absorber 1, a direct-fired generator 7, a first condenser 10, a solution heat exchanger 5, a solution pump 3, a refrigerant pump 2, a control system (not shown in the figure) and pipes and valves connecting the various components. When the unit is running, the heat generated by the burner 6 of the direct-fired generator 7 burning fuel (gas, oil) is used as compensation heat energy to recover the heat of the waste heat source hot water entering and leaving the evaporator 4, and provide hot water for process or building heating with a temperature higher than the temperature of the waste heat source hot water. It is mainly used in places with both low-temperature heat sources and medium-temperature heating needs. There is a relatively stable proportional relationship between the heat supply of this unit and the evaporator load (i.e., the heat supply of waste hot water). The heat supply is generally 2.15~2.35 times the heat supply of waste hot water. When the heat supply of waste hot water decreases due to the decrease in the inlet temperature of waste hot water or the decrease in the flow rate of waste hot water, the heat supply of the unit will decrease accordingly. The lower the inlet temperature of waste hot water or the smaller the flow rate of waste hot water, the smaller the heat supply, making it difficult to operate at full load and meet the heating demand. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings. By adding a load balancing condenser and a hot water electric three-way regulating valve on the basis of the previous direct-fired single-effect lithium bromide absorption heat pump unit, when the waste hot water inlet temperature or waste hot water flow rate of the unit is lower than the design parameter, the hot water electric three-way regulating valve is used to adjust and control part (or all) of the waste hot water to enter the load balancing condenser for heating and temperature increase, thereby increasing the waste hot water inlet temperature of the evaporator, and at the same time increasing the fuel combustion amount, achieving a balance between the heat supply and the evaporator load, so that the unit can operate at full load and meet the heating demand.

[0004] The object of the present invention is achieved in that:

[0005] A direct-fired lithium bromide absorption heat pump unit with a load balancing condenser comprises an absorber, a refrigerant pump, a solution pump, an evaporator, a solution heat exchanger, a direct-fired generator and a condenser. The condenser comprises a first condenser and a second condenser, the second condenser being used as a load balancing condenser. A hot water electric three-way regulating valve is provided on the waste hot water inlet pipe of the unit.

[0006] Preferably, the hot water electric three-way regulating valve is a diversion type hot water electric three-way regulating valve, the inlet of the hot water electric three-way regulating valve is connected to the waste hot water inlet pipe, the straight outlet of the hot water electric three-way regulating valve is connected to the evaporator water inlet pipe, the bypass outlet of the hot water electric three-way regulating valve is connected to the second condenser water inlet pipe, and the second condenser water outlet pipe is connected to the evaporator water inlet pipe.

[0007] Preferably, the hot water electric three-way regulating valve is a converging type hot water electric three-way regulating valve, the outlet of the hot water electric three-way regulating valve is connected to the evaporator water inlet pipe, the straight inlet of the hot water electric three-way regulating valve is connected to the waste hot water inlet pipe, the bypass inlet of the hot water electric three-way regulating valve is connected to the second condenser water outlet pipe, and the second condenser water inlet pipe is connected to the waste hot water inlet pipe.

[0008] Preferably, the first condenser and the second condenser are arranged in the same condenser cylinder.

[0009] Preferably, when the waste hot water inlet temperature or waste hot water flow rate of the unit is lower than the design parameters, part or all of the waste hot water is controlled by the hot water electric three-way regulating valve to enter the second condenser for heating and raising the temperature, thereby increasing the waste hot water inlet temperature of the evaporator and increasing the fuel combustion amount to match the heat supply with the evaporator load.

[0010] The beneficial effects of the present invention are:

[0011] The unit of the present invention is provided with a load balancing condenser and a hot water electric three-way regulating valve. When the waste hot water inlet temperature or the waste hot water flow rate of the unit is lower than the design parameters, part (or all) of the waste hot water is controlled by the hot water electric three-way regulating valve to enter the load balancing condenser for heating and temperature rise. At the same time, the fuel combustion amount is increased, and the load balancing condenser is used to transfer part of the heat generated by the fuel combustion to the evaporator, so as to increase the waste hot water inlet temperature of the evaporator and achieve a balance between the heat supply and the evaporator load, so that the unit can operate at full load and meet the heating demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of a previous direct-fired single-effect lithium bromide absorption heat pump unit.

[0013] Figure 2 This is a schematic structural diagram of a direct-fired lithium bromide absorption heat pump unit with a load balancing heat exchanger according to the first embodiment of the present invention.

[0014] Figure 3 Schematic diagram of the structure of a direct-fired lithium bromide absorption heat pump unit with a load balancing condenser in the second embodiment of the present invention.

[0015] Among them: 1-absorber, 2-refrigerant pump, 3-solution pump, 4-evaporator, 5-solution heat exchanger, 6-burner, 7-direct-fired generator, 8-absorber outlet pipe, 9-hot water outlet pipe, 10-first condenser, 11-condenser cylinder, 12-second condenser, 13-second condenser inlet pipe, 14-second condenser outlet pipe, 15-waste hot water outlet pipe, 16-waste hot water inlet pipe, 17-hot water electric three-way regulating valve, 18-evaporator inlet pipe, 19-hot water inlet pipe. DETAILED DESCRIPTION

[0016] The first implementation method is shown in Figure 2 The present invention relates to a direct-fired lithium bromide absorption heat pump unit with a load balancing condenser, which is composed of an evaporator 4, an absorber 1, a direct-fired generator 7, a condenser, a solution heat exchanger 5, a solution pump 3, a refrigerant pump 2, a control system (not shown in the figure), and pipes and valves connecting the various components. The condenser includes a first condenser 10 and a second condenser 12, the second condenser 12 is used as a load balancing condenser, and the first condenser 10 and the second condenser 12 are arranged in the same condenser cylinder 11. A diversion type hot water electric three-way regulating valve 17 is arranged on the waste hot water inlet pipe 16 of the unit, the inlet of the hot water electric three-way regulating valve 17 is connected to the waste hot water inlet pipe 16, the straight outlet of the hot water electric three-way regulating valve 17 is connected to the evaporator water inlet pipe 18, the bypass outlet of the hot water electric three-way regulating valve 17 is connected to the water inlet pipe of the second condenser 12 - the second condenser water inlet pipe 13, and the water outlet pipe of the second condenser 12 - the second condenser water outlet pipe 14 is connected to the evaporator water inlet pipe 18.

[0017] When the unit is running, the opening, closing and opening degree of the bypass outlet side of the hot water electric three-way regulating valve 17 are automatically adjusted and controlled by the control system of the unit according to the waste hot water outlet temperature and the hot water outlet temperature: if the waste hot water outlet temperature is greater than or equal to the design temperature, the hot water outlet temperature can reach the design temperature, the bypass outlet side of the hot water electric three-way regulating valve 17 is closed, and the waste hot water does not enter the second condenser 12; if the waste hot water outlet temperature has dropped to the design temperature but the hot water outlet temperature has not reached the design temperature, the bypass outlet side of the hot water electric three-way regulating valve 17 is opened, and a part of the waste hot water enters the second condenser 12 through the second condenser inlet pipe 13, is heated by the high-temperature steam from the direct-fired generator 7, and then exits the second condenser 12 through the second condenser outlet pipe 14, merges with the rest of the waste hot water, and enters the evaporator 4 through the evaporator inlet pipe 18, thereby increasing the waste hot water inlet temperature of the evaporator 4, achieving a balance between the heat supply and the evaporator load, so that the unit can operate at full load and meet the heating demand. The lower the waste hot water inlet temperature or the smaller the flow rate, the greater the opening of the bypass outlet side of the hot water electric three-way regulating valve 17, until it is fully opened, and the greater the waste hot water flow rate flowing through the second condenser 12, until all the waste hot water flows through the second condenser 12. Under this operating condition, since the second condenser consumes part of the high-temperature steam heat of the direct-fired generator 7, it is necessary to increase the fuel combustion amount of the burner 6 simultaneously to ensure that the heat load of the first condenser 10 matches the heat supply and the hot water outlet temperature meets the requirements.

[0018] The second implementation method is shown in Figure 3 A converging type hot water electric three-way regulating valve 17 is arranged on the waste hot water inlet pipe 16 of the unit, the straight inlet of the hot water electric three-way regulating valve 17 is connected to the waste hot water inlet pipe 16 of the unit, the bypass inlet of the hot water electric three-way regulating valve 17 is connected to the outlet pipe of the second condenser 12 - the second condenser outlet pipe 14, the outlet of the hot water electric three-way regulating valve 17 is connected to the evaporator inlet pipe 18, and the inlet pipe of the second condenser 12 - the second condenser inlet pipe 13 is connected to the waste hot water inlet pipe 16. The rest of the structure is the same as that of the first embodiment.

[0019] When the unit is running, the opening, closing and opening degree of the bypass inlet side of the hot water electric three-way regulating valve 17 are automatically adjusted and controlled by the control system of the unit according to the waste hot water outlet temperature and the hot water outlet temperature to adjust and control the waste hot water flow through the second condenser. The adjustment and control method is the same as the first implementation method.

[0020] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A direct-fired lithium bromide absorption heat pump unit with a load-balancing condenser, comprising an absorber (1), a refrigerant pump (2), a solution pump (3), an evaporator (4), a solution heat exchanger (5), a direct-fired generator (7) and a condenser, characterized in that: The condenser comprises a first condenser (10) and a second condenser (12), the second condenser (12) being used as a load balancing condenser, and a hot water electric three-way regulating valve (17) being provided on the waste hot water inlet pipe (16) of the unit; The first condenser (10) and the second condenser (12) are arranged in the same condenser cylinder (11); The hot water electric three-way regulating valve (17) is a diversion type hot water electric three-way regulating valve, the inlet of the hot water electric three-way regulating valve (17) is connected to the waste hot water inlet pipe (16), the straight outlet of the hot water electric three-way regulating valve (17) is connected to the evaporator water inlet pipe (18), the bypass outlet of the hot water electric three-way regulating valve (17) is connected to the second condenser water inlet pipe (13), and the second condenser water outlet pipe (14) is connected to the evaporator water inlet pipe (18); Alternatively, the hot water electric three-way regulating valve (17) is a confluence type hot water electric three-way regulating valve, the outlet of the hot water electric three-way regulating valve (17) is connected to the evaporator water inlet pipe (18), the straight inlet of the hot water electric three-way regulating valve (17) is connected to the waste hot water inlet pipe (16), the bypass inlet of the hot water electric three-way regulating valve (17) is connected to the second condenser water outlet pipe (14), and the second condenser water inlet pipe (13) is connected to the waste hot water inlet pipe (16).

2. A direct-fired lithium bromide absorption heat pump unit with a load balancing condenser according to claim 1, characterized in that: When the waste hot water inlet temperature or waste hot water flow rate of the unit is lower than the design parameters, part or all of the waste hot water is controlled by the hot water electric three-way regulating valve to enter the second condenser for heating and temperature increase, thereby increasing the waste hot water inlet temperature of the evaporator and increasing the fuel combustion amount to match the heat supply with the evaporator load.

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