Single-effect two-stage compound lithium bromide absorption refrigerating unit with supplementary combustion

Abstract

The application relates to a single-effect two-stage composite lithium bromide absorption refrigerating unit with supplementary combustion, and belongs to the technical field of air conditioning equipment. The unit comprises an evaporator, an absorber, a single-effect generator, a single-effect condenser, a two-stage low-pressure generator, a two-stage absorber, a two-stage high-pressure generator, a two-stage high-pressure condenser and a supplementary combustion generator. The unit can be driven by a waste heat driving heat source to drive the single-effect two-stage composite refrigerating unit, or can be driven by the supplementary combustion heat source to drive the unit to operate, so that the unit can provide stable refrigerating output when the waste heat driving heat source is insufficient or is not available.

Description

TECHNICAL FIELD

[0001] The present application relates to a single-effect two-stage composite lithium bromide absorption refrigerating unit with afterburning. It belongs to the technical field of air conditioning equipment. BACKGROUND

[0002] The existing single-effect two-stage composite lithium bromide absorption refrigerating unit (hereinafter referred to as a composite unit, or a unit) such as Figure 1As shown, the unit is composed of single-effect generator 1, single-effect condenser 2, secondary high-pressure generator 3, secondary high-pressure condenser 4, single-effect high-temperature heat exchanger 5, secondary heat exchanger 6, secondary absorber 7, secondary low-pressure generator 8, absorber 9, evaporator 10, single-effect low-temperature heat exchanger 11, secondary solution pump 12, primary solution pump 13, single-effect solution pump 14, refrigerant pump 15, control system, and pipes, valves, etc. connecting the components. Single-effect generator 1 and single-effect condenser 2 are in one cavity, secondary high-pressure generator 3 and secondary high-pressure condenser 4 are in one cavity, secondary low-pressure generator 8 and secondary absorber 7 are in one cavity and are respectively equipped with primary solution pump 13 and secondary solution pump 12, evaporator 10 and absorber 9 are in one cavity and are respectively equipped with refrigerant pump 15 and single-effect solution pump 14. Cold water flows through evaporator 10 to lower the temperature; the cooling water is divided into three parallel streams, one of which flows through absorber 9, one of which flows through secondary absorber 7, and the other of which flows through single-effect condenser 2 and secondary high-pressure condenser 4 in series; the driving heat source flows through single-effect generator 1, secondary low-pressure generator 8, and secondary high-pressure generator 3 in series to release heat and drive the entire unit to operate. When the unit is operating, the refrigerant water sprayed from the top of evaporator 10 after being pumped out by refrigerant pump 15 exchanges heat with the cold water in the heat transfer pipes of evaporator 10, lowering its temperature and vaporizing into refrigerant steam, which enters absorber 9 and is absorbed by the primary lithium bromide solution therein, and the released heat is taken away by the cooling water flowing through the heat transfer pipes; the primary lithium bromide solution in absorber 9 becomes diluted after being pumped out by single-effect solution pump 14 and heated by single-effect low-temperature heat exchanger 11 and single-effect high-temperature heat exchanger 5, and then enters single-effect generator 1. The primary lithium bromide dilute solution is heated and concentrated in single-effect generator 1 by the driving heat source, the concentrated refrigerant steam enters single-effect condenser 2 and is cooled and condensed by the cooling water, and the condensed refrigerant water returns to evaporator 10; and the concentrated primary lithium bromide concentrated solution is cooled by single-effect high-temperature heat exchanger 5 and then enters secondary low-pressure generator 8. The primary lithium bromide solution is heated and concentrated again in secondary generator 8 by the driving heat source, the concentrated refrigerant steam enters secondary absorber 7 and is absorbed by the secondary solution (the released heat is taken away by the cooling water flowing through the heat transfer pipes), and the concentrated concentrated solution is pumped out by primary solution pump 13, cooled by single-effect low-temperature heat exchanger 11, and returned to absorber 9 to absorb the refrigerant steam generated in evaporator 10 again. The secondary solution in secondary absorber 7 becomes diluted after absorbing the refrigerant steam generated by the concentration of the primary solution in secondary low-pressure generator 8, is pumped out by secondary solution pump 12, is heated by secondary heat exchanger 6, and then enters secondary high-pressure generator 3, where it is heated and concentrated by the driving heat source, the concentrated refrigerant steam enters secondary high-pressure condenser 4, is cooled and condensed by the cooling water, and returns to evaporator 10, and the concentrated secondary solution is cooled by secondary heat exchanger 6 and returned to secondary absorber 7 to continue absorbing refrigerant steam.

[0003] In the composite unit, the driving heat source first releases heat in the single-effect generator 1 to drive the single-effect refrigeration of the unit (higher refrigeration COP), and then enters the secondary low-pressure generator 8 and the secondary high-pressure generator 3 to release heat to drive the two-stage absorption and two-stage generation refrigeration of the unit (lower refrigeration COP). Although the COP of the two-stage absorption and two-stage generation refrigeration cycle is lower, the outlet temperature of the driving heat source can be utilized to be lower, so that the heat of the driving heat source can be fully utilized for refrigeration, and thus the composite unit has good application prospect in the field of industrial waste heat utilization. On the other hand, due to the influence of industrial production, when the waste heat source is unstable, the refrigeration output of the unit will also be unstable, even if a standby machine is equipped, there will be problems such as fluctuation of cold water flow distribution and load adjustment, thereby affecting the unit. If other heat sources are introduced into the composite unit to supplement the driving, the unit output can be stabilized when the waste heat source is unstable, and even when there is no waste heat source, the unit output can be ensured, thereby solving the problem. SUMMARY

[0004] The purpose of the present application is to provide a single-effect two-stage composite lithium bromide absorption refrigeration unit with supplementary combustion, which can introduce a supplementary combustion heat source to supplement the driving of the unit when the waste heat driving heat source is unstable, and can realize seamless connection of the supplementary combustion heat source and the waste heat driving heat source, and ensure stable unit output.

[0005] The purpose of the present application is achieved by a single-effect two-stage composite lithium bromide absorption refrigeration unit with supplementary combustion (hereinafter referred to as a composite unit with supplementary combustion, or a unit), which comprises a single-effect generator, a single-effect condenser, a secondary high-pressure generator, a secondary high-pressure condenser, a single-effect high-temperature heat exchanger, a single-effect low-temperature heat exchanger, a secondary heat exchanger, a secondary low-pressure generator, a secondary absorber, an evaporator, an absorber, a single-effect solution pump, a primary solution pump, a secondary solution pump, a refrigerant pump, a supplementary combustion solution pump, a supplementary combustion generator, and a supplementary combustion heat exchanger. The supplementary combustion solution pump, the supplementary combustion generator, and the supplementary combustion heat exchanger are added to the conventional single-effect two-stage composite unit. The supplementary combustion solution pump connects the absorber, the supplementary combustion heat exchanger, and the supplementary combustion generator to form a solution circulation, the supplementary combustion generator communicates with the secondary high-pressure condenser, and the supplementary combustion heat source flows through the supplementary combustion generator. When the driving heat source cannot meet the refrigeration demand of the unit, the supplementary combustion solution pump draws the lithium bromide dilute solution in the absorber, sends it into the supplementary combustion generator through the supplementary combustion heat exchanger, and heats and concentrates it by the supplementary combustion heat source. The condensed refrigerant vapor enters the secondary high-pressure condenser and then enters the evaporator, and the concentrated lithium bromide concentrated solution returns to the absorber through the supplementary combustion heat exchanger.

[0006] Further, the increased supplemental combustion generator can be divided into a supplemental combustion high-pressure generator, a supplemental combustion low-pressure generator, the supplemental combustion heat exchanger can be divided into a supplemental combustion low-temperature heat exchanger, a supplemental combustion high-temperature heat exchanger. The supplemental combustion solution pump draws the lithium bromide dilute solution in the absorber, and sends it into the supplemental combustion high-pressure generator through the supplemental combustion low-temperature heat exchanger and the supplemental combustion high-temperature heat exchanger, and the lithium bromide solution is heated and concentrated by the supplemental combustion heat source, the concentrated lithium bromide solution enters the supplemental combustion low-pressure generator through the supplemental combustion high-temperature heat exchanger, the high-temperature coolant steam concentrated out enters the heat transfer pipe of the supplemental combustion low-pressure generator as a heat source to heat and concentrate the lithium bromide solution again, and the heat is released and condensed to enter the secondary high-pressure condenser, and the coolant steam generated by the lithium bromide solution concentrated again also enters the secondary high-pressure condenser, and the lithium bromide concentrated solution after being concentrated again returns to the absorber through the supplemental combustion low-temperature heat exchanger.

[0007] The lithium bromide solution drawn by the foregoing unit supplemental combustion solution pump flows through the supplemental combustion high-pressure generator and then the supplemental combustion low-pressure generator in series for concentration, or flows through the supplemental combustion low-pressure generator and then the supplemental combustion high-pressure generator in series for concentration, or flows through the supplemental combustion high-pressure generator and the supplemental combustion low-pressure generator in parallel for concentration.

[0008] The foregoing unit supplemental combustion generator is in communication with the secondary high-pressure condenser, and the coolant steam generated by the lithium bromide solution concentrated enters the secondary high-pressure condenser, or the supplemental combustion generator is in communication with the single-effect condenser, and the coolant steam generated by the lithium bromide solution concentrated enters the single-effect condenser.

[0009] The beneficial effects of the present application are:

[0010] Compared with the existing single-effect two-stage composite unit, the present application can increase a solution circulation of an absorber, a supplemental combustion heat exchanger and a supplemental combustion generator in parallel on the basis of the existing single-effect two-stage refrigeration cycle through the increase of a supplemental combustion solution pump, a supplemental combustion heat exchanger and a supplemental combustion generator, and when the waste heat driven heat source is insufficient and the refrigeration capacity of the unit is insufficient, the solution circulation is started, and the unit output can be supplemented by the supplemental combustion heat source to realize the stability of the unit output. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a working principle diagram of a previous single-effect two-stage composite lithium bromide absorption refrigeration unit.

[0012] Figure 2 It is a working principle diagram of a single-effect two-stage composite lithium bromide absorption refrigeration unit with supplemental combustion of the present application.

[0013] Figure 3 It is a working principle diagram of an example 2 of the present application.

[0014] In the drawings, the reference signs are:

[0015] Single-effect generator 1, single-effect condenser 2, two-stage high-pressure generator 3, two-stage high-pressure condenser 4, single-effect high-temperature heat exchanger 5, two-stage heat exchanger 6, two-stage absorber 7, two-stage low-pressure generator 8, absorber 9, evaporator 10, single-effect low-temperature heat exchanger 11, two-stage solution pump 12, first-stage solution pump 13, single-effect solution pump 14, refrigerant pump 15, afterburning solution pump 16, afterburning generator 17, afterburning high-pressure generator 17-1, afterburning low-pressure generator 17-2, afterburning heat exchanger 18, afterburning low-temperature heat exchanger 18-1, afterburning high-temperature heat exchanger 18-2

[0016] Cold water in A1, cold water out A2, cooling water in B1, cooling water out B2, driving heat source in C1, driving heat source out C2, afterburning heat source in D1, afterburning heat source out D2. DETAILED DESCRIPTION

[0017] For a further understanding of the present application, reference will be made to the following detailed description of the application taken in conjunction with the accompanying drawings.

[0018] Example 1

[0019] Reference Figure 2The application relates to a single-effect two-stage composite lithium bromide absorption refrigerating unit with supplementary combustion, which is composed of a single-effect generator 1, a single-effect condenser 2, a two-stage high-pressure generator 3, a two-stage high-pressure condenser 4, a single-effect high-temperature heat exchanger 5, a two-stage heat exchanger 6, a two-stage absorber 7, a two-stage low-pressure generator 8, an absorber 9, an evaporator 10, a single-effect low-temperature heat exchanger 11, a two-stage solution pump 12, a first-stage solution pump 13, a single-effect solution pump 14, a refrigerant pump 15, a supplementary combustion solution pump 16, a supplementary combustion generator 17, a supplementary combustion heat exchanger 18, a control system and pipelines and valves connected with the components. The single-effect generator 1 and the single-effect condenser 2 are arranged in one cavity, the two-stage high-pressure generator 3 and the two-stage high-pressure condenser 4 are arranged in one cavity, the two-stage low-pressure generator 8 and the two-stage absorber 7 are arranged in one cavity and are respectively provided with the first-stage solution pump 13 and the two-stage solution pump 12, the evaporator 10 and the absorber 9 are arranged in one cavity and are respectively provided with the refrigerant pump 15, the single-effect solution pump 14 and the supplementary combustion solution pump 16, and the supplementary combustion generator 17 is communicated with the two-stage high-pressure condenser 4. Cold water flows through the evaporator 10 to be cooled; the cooling water is divided into three parallel paths, one path flows through the absorber 9, one path flows through the two-stage absorber 7, and the other path flows through the single-effect condenser 2 and the two-stage high-pressure condenser 4 in series; a driving heat source flows through the single-effect generator 1, the two-stage low-pressure generator 8 and the two-stage high-pressure generator 3 in series to release heat and drive the single-effect and two-stage composite operation of the whole unit; and a supplementary combustion heat source flows through the supplementary combustion generator 17 to drive the supplementary combustion operation of the whole unit. When the unit operates, refrigerant water sprayed from the top of the evaporator 10 after being pumped out by the refrigerant pump 15 exchanges heat with the cold water in the heat transfer pipe of the evaporator 10 to reduce the temperature of the refrigerant water, and the refrigerant water is vaporized into refrigerant steam and then enters the absorber 9 to be absorbed by the first-stage lithium bromide solution, and the released heat is taken away by the cooling water flowing through the heat transfer pipe; the first-stage lithium bromide solution in the absorber 9 is diluted and then pumped out by the single-effect solution pump 14 and enters the single-effect generator 1 after being heated and warmed by the single-effect low-temperature heat exchanger 11 and the single-effect high-temperature heat exchanger 5; the first-stage lithium bromide solution is heated and concentrated in the single-effect generator 1 by the driving heat source, the concentrated refrigerant steam enters the single-effect condenser 2 and is cooled and condensed by the cooling water, and the condensed refrigerant water returns to the evaporator 10; and the concentrated first-stage lithium bromide solution is cooled by the single-effect high-temperature heat exchanger 5 and then enters the two-stage low-pressure generator 8. The first-stage lithium bromide solution is heated and concentrated again in the two-stage generator 8 by the driving heat source, the concentrated refrigerant steam enters the two-stage absorber 7 and is absorbed by the two-stage solution (the released heat is taken away by the cooling water flowing through the heat transfer pipe), and the concentrated solution is pumped out by the first-stage solution pump 13, heated and cooled by the single-effect low-temperature heat exchanger 11 and then returned to the absorber 9 to absorb the refrigerant steam generated in the evaporator 10 again.The secondary solution in the secondary absorber 7 is diluted after absorbing the refrigerant vapor generated by the concentration of the primary solution in the secondary low pressure generator 8, is pumped out by the secondary solution pump 12, is heated and raised in temperature by the secondary heat exchanger 6, is heated and concentrated in the secondary high pressure generator 3 by the driving heat source, the concentrated refrigerant vapor is cooled and condensed in the secondary high pressure condenser 4 by the cooling water, and is returned to the evaporator 10, and the concentrated secondary solution is cooled and lowered in temperature by the secondary heat exchanger 6, and is returned to the secondary absorber 7 to continue to absorb the refrigerant vapor. At the same time or separately from the operation of the single effect and two stage refrigeration cycle, the lithium bromide dilute solution in the absorber 9 is pumped out by the supplemental combustion solution pump 16, is heated and raised in temperature by the supplemental combustion heat exchanger 18, is sent into the supplemental combustion generator 17 to be heated and concentrated by the supplemental combustion heat source, the concentrated refrigerant vapor is cooled and condensed in the secondary high pressure condenser 4 by the cooling water, and is returned to the evaporator 10, and the concentrated lithium bromide concentrated solution is cooled and lowered in temperature by the supplemental combustion heat exchanger 18, and is returned to the absorber 9 to continue to absorb the refrigerant vapor.

[0020] Figure 2 In the single effect and two stage combined lithium bromide absorber refrigerating unit with supplemental combustion shown, the supplemental combustion generator 17 is in communication with the secondary high pressure condenser 4, and it can also be in communication with the single effect condenser 2.

[0021] Figure 2 In the single effect and two stage combined lithium bromide absorber refrigerating unit with supplemental combustion shown, the driving heat source is in series through the single effect generator 1, the secondary low pressure generator 8 and the secondary high pressure generator 3, it can also be in series through the single effect generator 1, the secondary high pressure generator 3 and the secondary low pressure generator 8, or it can be in series through the single effect generator 1, and then in parallel through the secondary high pressure generator 3 and the secondary low pressure generator 8.

[0022] Figure 2 In the single effect and two stage combined lithium bromide absorber refrigerating unit with supplemental combustion shown, the cooling water is divided into three paths, one path flows through the absorber 9, one path flows through the secondary absorber 7, and one path flows in series through the single effect condenser 2 and then through the secondary high pressure condenser 4, it can also be divided into three paths, one path flows through the absorber 9, one path flows through the secondary absorber 7, and one path flows in series through the secondary high pressure condenser 4 and then through the single effect condenser 2, or it can flow through the absorber 9, the secondary absorber 7, the single effect condenser 1 and the secondary high pressure condenser 4 in any other order of series connection, series-parallel connection or parallel connection.

[0023] Example 2

[0024] Reference Figure 3The application relates to a single-effect two-stage composite lithium bromide absorption refrigerating unit with supplementary combustion, which is composed of a single-effect generator 1, a single-effect condenser 2, a two-stage high-pressure generator 3, a two-stage high-pressure condenser 4, a single-effect high-temperature heat exchanger 5, a two-stage heat exchanger 6, a two-stage absorber 7, a two-stage low-pressure generator 8, an absorber 9, an evaporator 10, a single-effect low-temperature heat exchanger 11, a two-stage solution pump 12, a first-stage solution pump 13, a single-effect solution pump 14, a refrigerant pump 15, a supplementary combustion solution pump 16, a supplementary combustion high-pressure generator 17-1, a supplementary combustion low-pressure generator 17-2, a supplementary combustion low-temperature heat exchanger 18-1, a supplementary combustion high-temperature heat exchanger 18-2, a control system and pipelines and valves connected with the components. The single-effect generator 1 and the single-effect condenser 2 are arranged in one cavity, the two-stage high-pressure generator 3 and the two-stage high-pressure condenser 4 are arranged in one cavity, the two-stage low-pressure generator 8 and the two-stage absorber 7 are arranged in one cavity and are respectively provided with the first-stage solution pump 13 and the two-stage solution pump 12, the evaporator 10 and the absorber 9 are arranged in one cavity and are respectively provided with the refrigerant pump 15, the single-effect solution pump 14 and the supplementary combustion solution pump 16, and the supplementary combustion low-pressure generator 17-2 is communicated with the two-stage high-pressure condenser 4. Cold water flows through the evaporator 10 to be cooled; cooling water is divided into three parallel paths, one path flows through the absorber 9, one path flows through the two-stage absorber 7, and the other path flows through the single-effect condenser 2 and the two-stage high-pressure condenser 4 in series; a driving heat source flows through the single-effect generator 1, the two-stage low-pressure generator 8 and the two-stage high-pressure generator 3 in series to release heat and drive the single-effect and two-stage composite operation of the whole unit; and a supplementary combustion heat source flows through the supplementary combustion high-pressure generator 17-1 to drive the supplementary combustion operation of the whole unit. When the unit operates, refrigerant water sprayed from the top of the evaporator 10 after being pumped out by the refrigerant pump 15 exchanges heat with cold water in the heat transfer pipe of the evaporator 10 to reduce the temperature of the refrigerant water, and the refrigerant water is vaporized into refrigerant steam and then enters the absorber 9 to be absorbed by the first-stage lithium bromide solution, and the released heat is taken away by the cooling water flowing through the heat transfer pipe; the first-stage lithium bromide solution in the absorber 9 is diluted, is pumped out by the single-effect solution pump 14, is heated and warmed by the single-effect low-temperature heat exchanger 11 and the single-effect high-temperature heat exchanger 5, and then enters the single-effect generator 1. The first-stage lithium bromide solution is heated and concentrated in the single-effect generator 1 by the driving heat source, the concentrated refrigerant steam enters the single-effect condenser 2, is cooled and condensed by the cooling water, and the condensed refrigerant water returns to the evaporator 10; and the concentrated first-stage lithium bromide solution is heated and cooled by the single-effect high-temperature heat exchanger 5 and then enters the two-stage low-pressure generator 8. The first-stage lithium bromide solution is heated and concentrated again in the two-stage generator 8 by the driving heat source, the concentrated refrigerant steam enters the two-stage absorber 7 to be absorbed by the two-stage solution (the released heat is taken away by the cooling water flowing through the heat transfer pipe), and the concentrated solution is pumped out by the first-stage solution pump 13, is heated and cooled by the single-effect low-temperature heat exchanger 11, and then returns to the absorber 9 to absorb the refrigerant steam generated in the evaporator 10 again.The secondary solution in the secondary absorber 7 is diluted after absorbing the refrigerant steam generated by the concentration of the primary solution in the secondary low-pressure generator 8, is pumped out by the secondary solution pump 12, is heated and raised in temperature by the secondary heat exchanger 6, is heated and concentrated in the secondary high-pressure generator 3 by the driving heat source, the concentrated refrigerant steam is cooled and condensed by the cooling water in the secondary high-pressure condenser 4 and is returned to the evaporator 10, and the concentrated secondary solution is cooled and lowered in temperature by the secondary heat exchanger 6 and is returned to the secondary absorber 7 to continue absorbing the refrigerant steam. At the same time or separately from the single-effect two-stage composite lithium bromide absorption refrigerating unit, the dilute lithium bromide solution in the absorber 9 is pumped out by the supplementary combustion solution pump 16, is heated and raised in temperature by the supplementary combustion low-temperature heat exchanger 18-1 and the supplementary combustion high-temperature heat exchanger 18-2, is sent to the supplementary combustion high-pressure generator 17-1 and is heated and concentrated by the supplementary combustion heat source, the concentrated lithium bromide solution is cooled and lowered in temperature by the supplementary combustion high-temperature heat exchanger 18-2, is entered into the supplementary combustion low-pressure generator 17-2, the concentrated high-temperature refrigerant steam is entered into the heat transfer pipe of the supplementary combustion low-pressure generator 17-2 to heat and concentrate the lithium bromide solution again, is cooled and condensed by the released heat and is entered into the secondary high-pressure condenser 4, the refrigerant steam generated by the concentration of the solution is also entered into the secondary high-pressure condenser 4, is cooled and condensed by the cooling water in the secondary high-pressure condenser 4 and is returned to the evaporator 10, and the concentrated lithium bromide solution is cooled and lowered in temperature by the supplementary combustion low-temperature heat exchanger 18-1 and is returned to the absorber 9 to continue absorbing the refrigerant steam.

[0025] Figure 3 In the single-effect two-stage composite lithium bromide absorption refrigerating unit with supplementary combustion shown, the supplementary combustion low-pressure generator 17-2 is communicated with the secondary high-pressure condenser 4, and it can also be communicated with the single-effect condenser 2.

[0026] Figure 3 In the single-effect two-stage composite lithium bromide absorption refrigerating unit with supplementary combustion shown, the driving heat source is in series and flows through the single-effect generator 1, the secondary low-pressure generator 8 and the secondary high-pressure generator 3, and it can also be in series and flow through the single-effect generator 1, the secondary high-pressure generator 3 and the secondary low-pressure generator 8, or first flow through the single-effect generator 1 and then flow through the secondary high-pressure generator 3 and the secondary low-pressure generator 8 in parallel.

[0027] Figure 3 In the single-effect two-stage composite lithium bromide absorption refrigerating unit with supplementary combustion shown, the cooling water is divided into three paths, one path flows through the absorber 9, one path flows through the secondary absorber 7, and one path flows in series and first flows through the single-effect condenser 2 and then flows through the secondary high-pressure condenser 4, and it can also be divided into three paths, one path flows through the absorber 9, one path flows through the secondary absorber 7, and one path flows in series and first flows through the secondary high-pressure condenser 4 and then flows through the single-effect condenser 2, or it can flow through the absorber 9, the secondary absorber 7, the single-effect condenser 1 and the secondary high-pressure condenser 4 in other arbitrary order of series connection, series-parallel connection or parallel connection.

[0028] Figure 3 In the single-effect two-stage compound lithium bromide absorption chiller unit with supplemental firing shown, the lithium bromide solution pumped out by the supplemental firing solution pump 16 flows through the supplemental firing high-pressure generator 17-1 first and then through the supplemental firing low-pressure generator 17-2. It can also flow through the supplemental firing low-pressure generator 17-2 first and then through the supplemental firing high-pressure generator 17-1, or flow through the supplemental firing high-pressure generator 17-1 and the supplemental firing low-pressure generator 17-2 in parallel.

Claims

1. A single-effect two-stage compound lithium bromide absorption chiller with supplemental firing, comprising: Single-effect generator, single-effect condenser, two-stage high-pressure generator, two-stage high-pressure condenser, single-effect high-temperature heat exchanger, single-effect low-temperature heat exchanger, two-stage heat exchanger, two-stage low-pressure generator, two-stage absorber, evaporator, absorber, single-effect solution pump for extracting lithium bromide dilute solution from the absorber and delivering it to the single-effect generator via the single-effect low-temperature heat exchanger and the single-effect high-temperature heat exchanger; primary solution pump for extracting lithium bromide concentrated solution from the two-stage low-pressure generator and delivering it back to the absorber via the single-effect low-temperature heat exchanger; two-stage solution pump for extracting lithium bromide dilute solution from the two-stage absorber and delivering it to the two-stage high-pressure generator via the two-stage heat exchanger; refrigerant pump for extracting refrigerant water from the evaporator and spraying it to the top of the evaporator; characterized in that it further comprises a supplementary combustion solution pump, a supplementary combustion generator and a supplementary combustion heat exchanger; the supplementary combustion solution pump connects the absorber, the supplementary combustion heat exchanger and the supplementary combustion generator to form a solution circulation, the supplementary combustion generator is in communication with the two-stage high-pressure condenser, and a supplementary combustion heat source flows through the supplementary combustion generator; when the driving heat source cannot meet the refrigeration demand of the unit, the supplementary combustion solution pump extracts lithium bromide dilute solution from the absorber, delivers it to the supplementary combustion generator via the supplementary combustion heat exchanger, and is heated and concentrated by the supplementary combustion heat source, the concentrated refrigerant steam enters the two-stage high-pressure condenser and then enters the evaporator, and the concentrated lithium bromide concentrated solution returns to the absorber via the supplementary combustion heat exchanger.

2. The single-effect two-stage compound lithium bromide absorption chiller with topping according to claim 1, characterized in that: The supplementary combustion generator is divided into a supplementary combustion high-pressure generator and a supplementary combustion low-pressure generator, and the supplementary combustion heat exchanger is divided into a supplementary combustion low-temperature heat exchanger and a supplementary combustion high-temperature heat exchanger; the supplementary combustion solution pump extracts lithium bromide dilute solution from the absorber, delivers it to the supplementary combustion high-pressure generator via the supplementary combustion low-temperature heat exchanger and the supplementary combustion high-temperature heat exchanger, and is heated and concentrated by the supplementary combustion heat source, the concentrated lithium bromide solution enters the supplementary combustion low-pressure generator via the supplementary combustion high-temperature heat exchanger, the concentrated high-temperature refrigerant steam enters the heat transfer tube of the supplementary combustion low-pressure generator as a heat source to heat and concentrate lithium bromide solution again, is condensed by heat release itself and enters the two-stage high-pressure condenser, the refrigerant steam produced by the concentration of lithium bromide solution again also enters the two-stage high-pressure condenser, and the concentrated lithium bromide concentrated solution returns to the absorber via the supplementary combustion low-temperature heat exchanger.

3. The single-effect two-stage compound lithium bromide absorption chiller with topping according to claim 2, characterized in that: The lithium bromide solution extracted from the unit by the supplementary combustion solution pump is in series and flows through the supplementary combustion high-pressure generator and then the supplementary combustion low-pressure generator for concentration.

4. The single-effect two-stage compound lithium bromide absorption chiller with topping according to claim 2, characterized in that: The lithium bromide solution extracted from the unit by the supplementary combustion solution pump is in series and flows through the supplementary combustion low-pressure generator and then the supplementary combustion high-pressure generator for concentration.

5. The single-effect two-stage compound lithium bromide absorption chiller with topping according to claim 2, characterized in that: The lithium bromide solution extracted from the unit by the supplementary combustion solution pump is in parallel and flows through the supplementary combustion high-pressure generator and the supplementary combustion low-pressure generator for concentration.

6. The single-effect two-stage compound lithium bromide absorption chiller with topping according to claim 1, characterized in that: The supplementary combustion generator is in communication with the two-stage high-pressure condenser, and the refrigerant steam produced by the concentration of lithium bromide solution enters the two-stage high-pressure condenser.

7. The single-effect two-stage compound lithium bromide absorption chiller with topping according to claim 1, characterized in that: The supplementary combustion generator is in communication with the single-effect condenser, and the refrigerant steam produced by the concentration of lithium bromide solution enters the single-effect condenser.

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