CN201340135Y - Hot water direct combustion single/double effect composite type lithium bromide absorption cold water/hot and cold water set - Google Patents

Abstract

The utility model relates to a hot water direct-fired single-double-effect compound lithium bromide absorption chiller and hot water unit, comprising a direct-fired high-voltage generator (7), an evaporator (22), an absorber (1), a low-pressure generator Condenser, condenser (21), solution heat exchanger, solution pump and refrigerant pump (24), described low pressure generator comprises hot water generator (15) and steam generator (17), hot water heat exchange tube bundle ( 18) and the steam heat exchange tube bundle (19) are arranged in the same cylinder (20), and a partition plate (16) is arranged between the hot water heat exchange tube bundle (18) and the steam heat exchange tube bundle (19); the solution heat exchange The device includes a high-temperature heat exchanger (6), a low-temperature heat exchanger (4) and a single-effect solution heat exchanger (5); the solution pump includes a single-effect solution pump (23) and a double-effect solution pump (25); the single-effect solution The pump (23) and the single-effect solution heat exchanger (5) are arranged on the connecting pipeline between the absorber (1) and the hot water generator (15), forming a single-effect solution circulation process system. The unit of the utility model can realize good matching between the single-effect solution circulation volume, the double-effect solution circulation volume and the heating load.

Description

Hot water direct-fired single-double-effect compound lithium bromide absorption chiller, hot and cold water unit

(1) Technical field

The utility model relates to a lithium bromide absorption type cold water, cold and hot water unit. It belongs to the technical field of air conditioning equipment.

(2) Background technology

The previous direct-fired lithium bromide absorption chiller and hot water unit is shown in Figure 1. The unit consists of a direct-fired high-pressure generator 7, an evaporator 22, an absorber 1, a low-pressure generator 27, a condenser 21, and a high-temperature heat exchanger. 6. Low-temperature heat exchanger 4. It consists of a control system (not shown in the figure), pipelines and valves connecting various components. The direct-fired lithium bromide absorption chiller can only be driven by the heat generated by direct combustion of fuel.

In the past, cooling operation could be driven by hot water (such as solar hot water, geothermal hot water, waste hot water generated in various production processes, etc.) and heat generated by direct combustion of fuel at the same time or separately, and heat generated by direct combustion of fuel Driven for heating operation, the hot water direct-fired dual-purpose lithium bromide absorption chiller and hot water unit used to provide cold (hot) water for air conditioning is shown in Figure 2. The low-pressure generator 37 of this unit is a hot water steam composite type Generator structure, the dilute solution communication pipe 29 between the low-temperature heat exchanger 4 and the low-pressure generator is provided with an electric regulating valve 31, and a solenoid valve 31 is provided on the high-efficiency liquid inlet pipe 32, so that the unit can use heat at the same time or separately. Cooling operation is driven by heat from water or direct combustion of fuel. But this unit has the following disadvantages:

1. Electric control valves and solenoid valves must use high air-tightness and high reliability valves, which brings difficulties to the selection of purchased parts (the available valves on the market are either expensive or their performance cannot meet the requirements);

2. When the unit uses the heat of hot water and the heat generated by direct combustion of fuel to drive cooling operation, the operating frequency of the solution pump 28 is automatically controlled according to the pressure of the direct combustion high-pressure generator 7, and the opening of the electric control valve must be adjusted at the same time Control to reduce the amount of dilute solution entering the low-pressure generator, the control is difficult, and it is difficult to achieve a good match between the distribution of solution circulation and the complementary heating amount.

(3) Contents of the invention

The purpose of this utility model is to overcome the above disadvantages and provide a hot water unit that can simultaneously or separately use the heat generated by hot water or direct combustion fuel to drive for cooling operation, and use the heat generated by direct combustion fuel to drive for heating operation. Direct-fired single- and double-effect composite lithium bromide absorption chillers, cold and hot water units.

The purpose of this utility model is achieved in this way: a hot water direct-fired single-double-effect composite lithium bromide absorption chiller, hot and cold water unit, including a direct-fired high-pressure generator, evaporator, absorber, low-pressure generator, The condenser, the solution heat exchanger, the solution pump, the refrigerant pump, and the pipelines and valves connecting the components are characterized in that:

The low pressure generator includes a hot water generator and a steam generator, the hot water heat exchange tube bundle of the hot water generator and the steam heat exchange tube bundle of the steam generator are arranged in the same cylinder, the hot water heat exchange tube bundle and the steam heat exchange tube bundle A partition plate is arranged between the heat pipe bundles,

The solution heat exchanger includes a high-temperature heat exchanger, a low-temperature heat exchanger and a single-effect solution heat exchanger,

The solution pump includes a single-effect solution pump and a double-effect solution pump,

The single-effect solution pump and the single-effect solution heat exchanger are arranged on the connecting pipeline between the absorber and the hot water generator to form a single-effect solution circulation flow system; the double-effect solution pump, the low-temperature heat exchanger and the high-temperature The heat exchanger is set on the connecting pipeline between the absorber, the direct-fired high-pressure generator and the steam generator to form a double-effect solution circulation process system, thus forming a single-double-effect composite solution circulation process system,

On the basis of the previous direct-fired lithium bromide absorption type hot and cold water, the utility model forms a single-effect solution circulation system by adding a single-effect solution pump, a single-effect solution heat exchanger and a hot water generator, so that the unit can simultaneously or The hot water direct-fired single-effect compound lithium bromide absorption chiller and hot water unit is driven by hot water or the heat generated by direct combustion of fuel for cooling operation, and the heat generated by direct combustion of fuel is used for heating operation. Disadvantages of regulating valves and solenoid valves. When the unit utilizes the heat of hot water and the heat generated by direct combustion of fuel to drive cooling operation, it is easy to perform matching control between the distribution of solution circulation and the complementary heating. When the unit is running, the thermal energy of waste hot water or low-cost hot water is fully utilized. Only when the cooling capacity (heat supply) of hot water cannot meet the demand of air conditioning, the burner is started for supplementary heating.

(4) Description of drawings

Figure 1 is a schematic diagram of a conventional direct-fired lithium bromide absorption chiller.

Fig. 2 is a schematic diagram of a conventional hot water direct-fired dual-purpose lithium bromide absorption chiller.

Fig. 3 is a schematic diagram of an embodiment of the hot water direct combustion single-double-effect compound lithium bromide absorption chiller and hot water unit of the utility model (the cooling water flow adopts a parallel flow).

Fig. 4 is a schematic diagram of another embodiment of the utility model hot water direct-fired single-double-effect compound lithium bromide absorption chiller and hot water unit (the cooling water flow adopts a parallel flow).

Fig. 5 is the hot water direct-fired lithium bromide absorption chiller used for independent refrigeration of the utility model.

Reference signs in the figure:

Absorber 1, absorber inlet pipe 2, solution switching valve 3, low temperature heat exchanger 4, single effect solution heat exchanger 5, high temperature heat exchanger 6, direct-fired high pressure generator 7, high output liquid pipe 8, Hot water generator inlet pipe 9, hot water generator outlet pipe 10, steam generator outlet pipe 11, refrigerant steam pipe 12, steam switching valve 13, steam generator inlet pipe 14, hot water generator 15 , partition plate 16, steam generator 17, hot water heat exchange tube bundle 18, steam heat exchange tube bundle 19, cylinder 20, condenser 21, evaporator 22, single-effect solution pump 23, refrigerant pump 24, double-effect solution Pump 25, burner 26, low pressure generator 27, solution pump 28, dilute solution connecting pipe 29, low emission liquid pipe 30, solenoid valve 31, high emission liquid inlet pipe 32, electric regulating valve 33, refrigerant steam pipe 34, heat Water inlet 35, hot water outlet 36, composite low pressure generator 37, intermediate solution distribution pipe 38, refrigerant water outlet pipe 39.

(5) Specific implementation methods

The unit of the utility model is shown in Figure 3, and the unit is composed of a direct-fired high-pressure generator 7, an evaporator 22, an absorber 1, a hot water generator 15, a steam generator 17, a condenser 21, and a high-temperature heat exchanger 6 , low temperature heat exchanger 4, single-effect solution heat exchanger 5, double-effect solution pump 25, single-effect solution pump 23, refrigerant pump 24, control system (not shown in the figure) and pipelines and valves connecting various components The hot water direct-fired single-double-effect compound lithium bromide absorption cold and hot water unit formed. The hot water heat exchange tube bundle 18 of the hot water generator 15 and the steam heat exchange tube bundle 19 of the steam generator 17 are arranged in the same cylinder 20 in a vertical structure (both the hot water generator and the steam generator are low-pressure generators), A partition plate 16 is arranged between the two heat exchange tube bundles; the dilute solution outlet pipe of the single-effect solution heat exchanger 5 is connected to the top of the hot water generator 15 as the liquid inlet pipe 9 of the hot water generator; The pipe 10 is used as the concentrated solution inlet pipe of the single-effect solution heat exchanger to be connected to the concentrated solution inlet header of the single-effect solution heat exchanger 5; the intermediate solution outlet pipe of the high-temperature heat exchanger 6 is used as the steam generator inlet The pipe 14 is connected to the top of the steam generator 17; the steam generator outlet pipe 11 is the concentrated solution inlet pipe of the low temperature heat exchanger 4; the concentrated solution outlet pipe of the single effect solution heat exchanger 5 and the low temperature heat exchanger 4 Both are connected to the liquid inlet pipe 2 of the absorber; a solution switching valve 3 is installed on the pipeline between the high emission liquid pipe 8 and the absorber 1; Steam switching valve 13.

When the unit uses hot water and the heat generated by burning fuel for cooling operation at the same time, the solution switching valve and the steam switching valve are closed, and the dilute solution output from the absorber by the single-effect solution pump passes through the single-effect solution heat exchanger and then heats up. The liquid inlet pipe of the water generator enters the hot water generator and is evenly distributed on the hot water heat exchange tube bundle. It is heated by the hot water from an external device (or system) and concentrated into a concentrated solution, then enters the bottom of the hot water generator, and then passes through the hot water. The liquid outlet pipe of the water generator enters the single-effect solution heat exchanger for heat exchange and cooling, and then enters the absorber through the liquid inlet pipe of the absorber to form a single-effect solution circulation process. The dilute solution output from the absorber by the double-effect solution pump passes through the low-temperature heat exchanger and the high-temperature heat exchanger, and then enters the direct-fired high-pressure generator, and is heated and concentrated by the heat generated by the burner 26 to form an intermediate solution. The intermediate solution enters the high-temperature heat exchanger through the high-emitting liquid pipe for heat exchange and cooling, and then enters the steam generator through the liquid inlet pipe of the steam generator and is evenly distributed on the steam heat exchange tube bundle. Generator) is further heated and concentrated into a concentrated solution, and then enters the bottom of the steam generator; the concentrated solution entering the bottom of the steam generator enters the low-temperature heat exchanger through the outlet pipe of the steam generator for heat exchange and cooling, and then enters the absorption through the liquid inlet pipe of the absorber device to form a double-effect solution circulation process. The refrigerant steam in the steam heat exchange tube bundle heats the solution outside the tube and condenses into refrigerant water (also known as high refrigerant water), and then enters the condenser; the hot water heat exchange tube bundle and the outside of the steam heat exchange tube bundle The steam generated by the solution heating enters the heat exchange tube bundle of the condenser and is condensed into refrigerant water. The refrigerant water enters the evaporator together with the high-temperature refrigerant water and is sprayed out of the evaporator tube for evaporative cooling, thereby realizing At the same time, the heat generated by hot water and direct combustion of fuel is used for cooling. The operation of the single-effect solution pump is controlled by frequency conversion according to the heat of hot water by the control system of the unit to control the circulation volume of the single-effect solution; the operation of the double-effect solution pump is controlled by frequency conversion by the control system of the unit according to the pressure of the direct-fired high-pressure generator , to control the double-effect solution circulation volume, the greater the fuel combustion volume of the burner, the higher the high-fire pressure, the higher the operating frequency of the double-effect solution pump, and the greater the double-effect solution circulation volume, so as to realize the single-effect solution circulation volume and double-effect solution circulation volume. There is a good match between the effective solution circulation volume and the heating load, and the unit operates according to the single and double effect composite solution circulation process.

When the unit uses hot water heat for cooling operation alone, the solution switching valve and steam switching valve are closed, the burner and double-effect solution pump stop, and the low-temperature heat exchanger, high-temperature heat exchanger, direct-fired high-pressure generator and steam generator do not operate. Working, the unit operates according to the single-effect solution circulation process.

When the unit uses the heat generated by burning fuel for cooling operation, the solution switching valve and steam switching valve are closed, there is no hot water circulation in the heat exchange tube of the hot water generator, the single-effect solution pump stops, and the single-effect solution heat exchanger and hot water generate If the device does not work, the unit operates according to the double-effect solution circulation process.

When the unit is running for heating, the solution switching valve and the steam switching valve are opened, and there is no hot water circulation in the hot water generator pipe (hot water from an external heat source is directly sent to the air conditioning system for heating, or sent to the heat exchanger to provide hot water for air conditioning ), the single-effect solution pump stops.

The fuel combustion volume of the burner is automatically adjusted and controlled by the control system of the unit according to the heating capacity required by the air-conditioning load. When the heat source hot water is waste hot water or low-cost hot water, the unit makes full use of the heat energy of waste hot water or low-cost hot water, only When the cooling capacity (heat supply) of hot water cannot meet the demand of air conditioning, the burner is started for supplementary heating.

The cooling water process of the unit can be a parallel process (as shown in Figure 3) or a series process (as shown in Figure 4).

Cancel the solution switching valve, steam switching valve and connecting pipes in the unit shown in Figure 3 and Figure 4, and the unit becomes a hot water direct-fired lithium bromide absorption chiller for separate refrigeration (as shown in Figure 5).

Claims (3)

1, a kind of hot-water direct-fired single-double effect compound type lithium bromide absorption type cold water, hot and cold water unit, comprise Direct Fired High Pressure Generator (7), evaporimeter (22), absorber (1), low pressure generator, condenser (21), solution heat exchanger, solution pump, cryogenic fluid pump (24), reach the pipeline and the valve that connect each parts, it is characterized in that:

Described low pressure generator comprises hot water generator (15) and steam generator (17), the hot water heat-exchanging tube bundle (18) of described hot water generator (15) and the steam heat-exchanging of steam generator (17) tube bank (19) are arranged in the same cylindrical shell (20), be provided with demarcation strip (16) between hot water heat-exchanging tube bundle (18) and the steam heat-exchanging tube bank (19)

Described solution heat exchanger comprises high-temperature heat exchanger (6), low temperature heat exchanger (4) and single-action solution heat exchanger (5),

Described solution pump comprises single-action solution pump (23) and economic benefits and social benefits solution pump (25);

Described single-action solution pump (23) and single-action solution heat exchanger (5) are arranged on the connecting line between absorber (1) and the hot water generator (15), form single-action solution circulation flow journey system; Described economic benefits and social benefits solution pump (25), low temperature heat exchanger (4) and high-temperature heat exchanger (6) are arranged on the connecting line between absorber (1), Direct Fired High Pressure Generator (7) and the steam generator (17), form economic benefits and social benefits solution circulation flow journey system, so just formed single-double effect compound type solution circulation flow journey system.

2, a kind of fume hot-water single-double effect compound type lithium bromide absorption type cold water according to claim 1, hot and cold water unit is characterized in that: the weak solution drain pipe of described single-action solution heat exchanger (5) is received hot water generator (15) top as hot water generator feed tube (9); The hot water generator drain pipe (10) of hot water generator (15) is received on the concentrated solution feed liquor header of single-action solution heat exchanger (5) as the concentrated solution feed tube of single-action solution heat exchanger (5); The intermediate solution drain pipe of high-temperature heat exchanger (6) is received steam generator (17) top as steam generator feed tube (14); The steam generator drain pipe (11) of steam generator (17) is the concentrated solution feed tube of low temperature heat exchanger (4); The concentrated solution drain pipe of single-action solution heat exchanger (5) and low temperature heat exchanger (4) is all received on the absorber feed tube (2); On the drain pipe occurred frequently (8) of Direct Fired High Pressure Generator (7) and the pipeline between the absorber (1), solution transfer valve (3) is housed; On the refrigerant vapour pipe (12) of Direct Fired High Pressure Generator (7) and the pipeline between the evaporimeter (22), steam transfer valve (13) is housed.

3, a kind of hot-water direct-fired single-double effect compound type lithium bromide absorption type cold water according to claim 1 and 2, hot and cold water unit is characterized in that: the hot water heat-exchanging tube bundle (18) of described hot water generator (15) and the steam heat-exchanging of steam generator (17) tube bank (19) is arranged in the same cylindrical shell (20) with frame mode up and down.

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