Waste heat recovery process system of lithium bromide absorption refrigerating unit matched with RTO

Abstract

The utility model discloses an RTO (regenerative thermal oxidizer) matched lithium bromide absorption type refrigerating unit waste heat recovery process system which is connected with an RTO heat storage combustion device and a lithium bromide absorption type refrigerating unit and comprises an air mixing box, and two air inlets of the air mixing box are respectively connected with a high-temperature smoke outlet of a hearth of the RTO heat storage combustion device and an air outlet of the lithium bromide absorption type refrigerating unit through pipelines. An air outlet of the air mixing box is connected with an air inlet of a lithium bromide absorption type refrigerating unit and a chimney smoke inlet through pipelines, a smoke outlet of the lithium bromide absorption type refrigerating unit is further connected with the chimney smoke inlet through a pipeline, and a smoke outlet in the bottom of the RTO heat storage combustion device is connected with the chimney smoke inlet through a pipeline. According to the utility model, the RTO heat storage combustion device is organically combined with the lithium bromide absorption type refrigerating unit, so that the problem of low heat energy utilization rate of the RTO heat storage combustion device in the prior art is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste heat recovery equipment of RTO regenerative thermal combustion device, and relates to a waste heat recovery process system of a lithium bromide absorption refrigeration unit supporting RTO. Background Art

[0002] RTO (Regenerative Thermal Oxidizer) is short for regenerative thermal combustion device. Its principle is to heat the organic waste gas to above 760 degrees Celsius (specifically depending on the composition), so that the VOCs in the waste gas are oxidized and decomposed into carbon dioxide and water. The high-temperature gas generated by oxidation flows through a special ceramic regenerator, causing the ceramic body to heat up and "store heat", and this "stored heat" is used to preheat the subsequent incoming organic waste gas. Thus, the fuel consumption for heating the waste gas is saved. The ceramic regenerator should be divided into two (including two) or more, and each regenerator experiences procedures such as heat storage - heat release - cleaning in sequence, repeating continuously, with the waste gas decomposition efficiency reaching more than 99% and the heat recovery efficiency reaching more than 95%.

[0003] A lithium bromide absorption refrigeration unit is a refrigeration device that uses water as the refrigerant and an aqueous lithium bromide solution as the absorbent. It utilizes the fact that water has a low boiling point in a vacuum and is easy to evaporate. When evaporating, it needs to absorb heat from the surrounding environment, thereby reducing the temperature of the surrounding environmental medium. The main driving heat sources include gas, fuel oil, hot water, steam, flue gas and their combinations, etc.

[0004] Currently, a large amount of heat is generated after the VOCs emitted by the production equipment in the flexible packaging industry are burned by the RTO regenerative thermal combustion device. When the self - operation of the RTO regenerative thermal combustion device is satisfied, the generated waste heat is discharged into the atmosphere, or a simple hot water recovery device is added, resulting in insufficient heat energy recovery, causing a large amount of heat energy waste and at the same time causing thermal pollution to the atmosphere. Content of the Utility Model

[0005] The purpose of the utility model is to provide a waste heat recovery process system of a lithium bromide absorption refrigeration unit supporting RTO, which organically combines the RTO regenerative thermal combustion device and the lithium bromide absorption refrigeration unit, and solves the problem of low thermal energy utilization rate of the RTO regenerative thermal combustion device in the prior art.

[0006] The technical solution adopted by the present utility model is a waste heat recovery process system for a lithium bromide absorption refrigeration unit supporting an RTO, which is connected to an RTO regenerative combustion device and a lithium bromide absorption refrigeration unit. It includes a mixing air box. The two air inlets of the mixing air box are respectively connected to the high-temperature smoke exhaust port of the furnace of the RTO regenerative combustion device and the air exhaust port of the lithium bromide absorption refrigeration unit through pipelines. The air outlet of the mixing air box is respectively connected to the air inlet of the lithium bromide absorption refrigeration unit and the smoke inlet of the chimney through pipelines. The smoke exhaust port of the lithium bromide absorption refrigeration unit is also connected to the smoke inlet of the chimney through a pipeline. The bottom smoke exhaust port of the RTO regenerative combustion device is connected to the smoke inlet of the chimney through a pipeline.

[0007] The characteristics of the present utility model also lie in that

[0008] The high-temperature smoke exhaust port of the furnace of the RTO regenerative combustion device is connected to the air inlet of the mixing air box through an RTO heat extraction bypass smoke pipeline. A heat extraction bypass valve is provided on the RTO heat extraction bypass smoke pipeline. The bottom smoke exhaust port of the RTO regenerative combustion device is connected to the smoke inlet of the chimney through the bottom smoke exhaust pipeline of the RTO regenerative combustion device.

[0009] A temperature transmitter is provided at the air outlet of the mixing air box.

[0010] The lithium bromide absorption refrigeration unit is provided with a chilled water outlet pipeline of the lithium bromide absorption refrigeration unit. A temperature transmitter is provided on the chilled water outlet pipeline of the lithium bromide absorption refrigeration unit.

[0011] The air outlet of the mixing air box is connected to a mixing air box outlet smoke pipeline. The mixing air box outlet smoke pipeline is connected to the air inlet of the lithium bromide absorption refrigeration unit through the lithium bromide absorption refrigeration unit inlet smoke pipeline. A lithium bromide absorption refrigeration unit inlet flue gas regulating valve is provided on the lithium bromide absorption refrigeration unit inlet smoke pipeline.

[0012] The mixing air box outlet smoke pipeline is also communicated with the bottom smoke exhaust pipeline of the RTO regenerative combustion device through a safety bypass smoke exhaust pipeline. A safety bypass flue gas exhaust switch valve is provided on the safety bypass smoke exhaust pipeline.

[0013] The smoke exhaust port of the lithium bromide absorption refrigeration unit is successively connected to a lithium bromide absorption refrigeration unit outlet smoke pipeline and an induced draft fan. The air outlet of the induced draft fan is connected to an outlet pipeline. The outlet pipeline is connected in two ways. One way is connected to the smoke inlet of the chimney through a wind pressure balance regulating pipeline, and the other way is connected to the air inlet of the mixing air box through a flue gas return pipeline. A wind pressure balance regulating valve is provided on the wind pressure balance regulating pipeline.

[0014] The lithium bromide absorption refrigeration unit outlet smoke pipeline is communicated with the bottom smoke exhaust pipeline of the RTO regenerative combustion device through a safety bypass inlet smoke pipeline. A safety bypass inlet flue gas switch valve is provided on the safety bypass inlet smoke pipeline.

[0015] The beneficial effects of the present utility model are as follows:

[0016] The waste heat recovery process system of the lithium bromide absorption refrigeration unit supporting the RTO of the present utility model recovers heat energy by adding a lithium bromide absorption refrigeration unit to the furnace flue gas of the RTO regenerative combustion device. At the same time, the opening of the automatic regulating heat extraction bypass valve is set at the outlet temperature of the mixing box, and the size realizes the full utilization of heat. The opening of the inlet regulating valve of the lithium bromide absorption refrigeration unit is automatically adjusted by controlling the outlet temperature of the chilled water. At the same time, a safety bypass design is provided to meet the process safety protection requirements of production equipment and improve the heat energy utilization rate in case of over-temperature of the driving heat source or failure of the lithium bromide absorption refrigeration unit. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the waste heat recovery process system of the lithium bromide absorption refrigeration unit supporting the RTO of the present utility model.

[0018] In the figure, 1. RTO regenerative combustion device; 2. RTO heat extraction bypass flue gas pipeline; 3. Heat extraction bypass valve; 4. Mixing box; 5. Outlet flue gas pipeline of the mixing box; 6. Inlet flue gas pipeline of the lithium bromide absorption refrigeration unit; 7. Inlet flue gas regulating valve of the lithium bromide absorption refrigeration unit; 8. Lithium bromide absorption refrigeration unit; 9. Outlet flue gas pipeline of the lithium bromide absorption refrigeration unit; 10. Induced draft fan; 11. Flue gas return pipeline; 12. Safety bypass exhaust gas switch valve; 13. Safety bypass exhaust flue gas pipeline; 14. Bottom exhaust flue gas pipeline of the RTO regenerative combustion device; 15. Safety bypass inlet flue gas pipeline; 16. Safety bypass inlet flue gas switch valve; 17. Chilled water outlet pipeline of the lithium bromide absorption refrigeration unit; 18. Air pressure balance adjustment pipeline; 19. Air pressure balance regulating valve; 20. Chimney; 21. Outlet pipeline. Specific Embodiments

[0019] The present utility model will be described in detail below with reference to the drawings and specific embodiments.

[0020] Embodiment 1

[0021] This embodiment provides a waste heat recovery process system for a lithium bromide absorption refrigeration unit supporting an RTO, which is connected to the RTO regenerative combustion device 1 and the lithium bromide absorption refrigeration unit 8. It includes a mixing air box 4. The two air inlets of the mixing air box 4 are respectively connected to the high-temperature flue gas outlet of the furnace of the RTO regenerative combustion device 1 and the exhaust outlet of the lithium bromide absorption refrigeration unit 8 through pipelines. The heat source of the mixing air box 4 comes from the furnace of the RTO regenerative combustion device 1, and the cold source comes from the exhaust air of the lithium bromide absorption refrigeration unit 8. They are mixed in the mixing air box to reach the flue gas temperature required by the lithium bromide absorption refrigeration unit 8, which serves as the heat source to drive the normal operation of the lithium bromide absorption refrigeration unit 8. The air outlet of the mixing air box 4 is respectively connected to the air inlet of the lithium bromide absorption refrigeration unit 8 and the flue gas inlet of the chimney 20 through pipelines. A temperature transmitter T1 is set at the air outlet of the mixing air box 4, and it is automatically adjusted through the temperature set value. The exhaust outlet of the lithium bromide absorption refrigeration unit 8 is also connected to the flue gas inlet of the chimney 20 through a pipeline. The bottom flue gas outlet of the RTO regenerative combustion device 1 is connected to the flue gas inlet of the chimney 20 through a pipeline. The lithium bromide absorption refrigeration unit 8 is provided with a chilled water outlet pipeline 17 of the lithium bromide absorption refrigeration unit, and a temperature transmitter T2 is set on the chilled water outlet pipeline 17 of the lithium bromide absorption refrigeration unit, and it is automatically adjusted through the temperature set value.

[0022] Embodiment 2

[0023] This embodiment provides a waste heat recovery process system for a lithium bromide absorption refrigeration unit supporting an RTO. On the basis of Embodiment 1, the high-temperature flue gas outlet of the furnace of the RTO regenerative combustion device 1 is connected to the air inlet of the mixing air box 4 through the RTO heat extraction bypass flue gas pipeline 2. A heat extraction bypass valve 3 is set on the RTO heat extraction bypass flue gas pipeline 2. The bottom flue gas outlet of the RTO regenerative combustion device 1 is connected to the flue gas inlet of the chimney 20 through the bottom flue gas pipeline 14 of the RTO regenerative combustion device.

[0024] The air outlet of the mixing air box 4 is connected to a mixing air box outlet flue gas pipeline 5. The mixing air box outlet flue gas pipeline 5 is connected to the air inlet of the lithium bromide absorption refrigeration unit 8 through the lithium bromide absorption refrigeration unit inlet flue gas pipeline 6. A lithium bromide absorption refrigeration unit inlet flue gas regulating valve 7 is set on the lithium bromide absorption refrigeration unit inlet flue gas pipeline 6. The flue gas that meets the requirements of the lithium bromide absorption refrigeration unit 8 after mixing enters the lithium bromide absorption refrigeration unit 8 through the lithium bromide absorption refrigeration unit inlet flue gas pipeline 6 and the lithium bromide absorption refrigeration unit inlet flue gas regulating valve 7 for heat exchange as the driving source.

[0025] To ensure the air pressure balance of the entire system and overcome the system resistance, an induced draft fan 10 is provided between the heat source outlet of the lithium bromide absorption refrigeration unit 8 and the air mixing box 4. The flue gas outlet of the lithium bromide absorption refrigeration unit 8 is successively connected to the flue gas pipeline 9 at the outlet of the lithium bromide absorption refrigeration unit and the induced draft fan 10. The air outlet of the induced draft fan 10 is connected to the outlet pipeline 21. The outlet pipeline 21 is connected in two ways. One way is connected to the smoke inlet of the chimney 20 through the air pressure balance adjustment pipeline 18, and the other way is connected to the air inlet of the air mixing box 4 through the flue gas return pipeline 11. A air pressure balance regulating valve 19 is provided on the air pressure balance adjustment pipeline 18 to serve as the air pressure balance adjustment mechanism for the flue gas inlet of the lithium bromide absorption refrigeration unit to ensure constant pressure.

[0026] Embodiment 3

[0027] This embodiment provides a waste heat recovery process system for an RTO supporting lithium bromide absorption refrigeration unit. On the basis of Embodiments 1-2, in order to prevent the lithium bromide absorption refrigeration unit 8 from crystallizing the lithium bromide solution due to overheating of the driving heat source, a safety bypass is provided on the smoke exhaust pipelines at the air inlet and outlet of the lithium bromide absorption refrigeration unit 8 and the RTO regenerative combustion device 1, and corresponding control valves are provided to play a role in protecting the system safety in case of overheating of the driving heat source or in case of a failure of the lithium bromide absorption refrigeration unit.

[0028] The flue gas pipeline 5 at the outlet of the air mixing box is connected to the bottom flue gas pipeline 14 of the RTO regenerative combustion device through the safety bypass flue gas pipeline 13, and a safety bypass flue gas exhaust switch valve 12 is provided on the safety bypass flue gas pipeline 13;

[0029] The flue gas pipeline 9 at the outlet of the lithium bromide absorption refrigeration unit is connected to the bottom flue gas pipeline 14 of the RTO regenerative combustion device through the safety bypass flue gas pipeline 15, and a safety bypass flue gas inlet switch valve 16 is provided on the safety bypass flue gas pipeline 15 to form the safety bypass of the lithium bromide absorption refrigeration unit 8, which is switched when the outlet temperature transmitter T1 is overheated or when the lithium bromide absorption refrigeration unit 8 fails.

[0030] The working process of the waste heat recovery process system for the RTO supporting lithium bromide absorption refrigeration unit of the present utility model is specifically as follows:

[0031] The high-temperature flue gas (850 °C) in the furnace of the RTO regenerative combustion device 1 is sent to the air mixing box 4 through the heat extraction bypass valve 3. The cold air source of the air mixing box 4 is the exhaust air (100 °C) of the lithium bromide absorption refrigeration unit 8. The high-temperature flue gas is cooled to the temperature required by the lithium bromide absorption refrigeration unit 8 (<600 °C) through the air mixing box 4. The lithium bromide absorption refrigeration unit 8 is provided with a cooling bypass. When the lithium bromide absorption refrigeration unit 8 is out of service (fault, stop, very low opening of the inlet valve), or when the outlet temperature T1 of the air mixing box 4 has a high-temperature alarm, the cooling bypass is started to cool the system to ensure the safe operation of the system.

[0032] When the RTO regenerative thermal oxidizer 1 is started, the safety bypass flue gas discharge switch valve 12 and the safety bypass flue gas inlet switch valve 16 are opened, the induced draft fan 10 is started, and the cooling bypass circuit is used to cool down the system and also to prevent heat leakage from the hot bypass valve. The pressure transmitter PT at the outlet of the mixing box 4 conducts pressure regulation loop control to control the opening of the air pressure balance regulating valve 19 and keep the flue gas pressure at the outlet of the mixing box 4 constant.

[0033] Automatic control logic of the chilled water outlet temperature transmitter T2 of the lithium bromide absorption refrigeration unit 8:

[0034] When the lithium bromide absorption refrigeration unit 8 is started, the safety bypass flue gas discharge switch valve 12 and the safety bypass flue gas inlet switch valve 16 are closed, the outlet temperature T1 of the mixing box 4 is switched to automatic control regulation, the chilled water outlet temperature transmitter T2 of the lithium bromide absorption refrigeration unit 8 is switched to automatic control regulation, and the regulation of the chilled water outlet temperature transmitter T2 is achieved through the inlet flue gas regulating valve 7 of the lithium bromide absorption refrigeration unit to realize the automatic control of the chilled water temperature. At the same time, the opening signal (4 - 20 mA) of the inlet flue gas regulating valve 7 of the lithium bromide absorption refrigeration unit is taken.

[0035] When the load of the lithium bromide absorption refrigeration unit 8 is very low, the opening of the inlet flue gas regulating valve 7 of the lithium bromide absorption refrigeration unit will be extremely low or even completely closed. This state is allowed for the lithium bromide air conditioner, but it will bring many problems to the entire hot air system, such as air blockage, air pressure balance, heat leakage, overheating, etc. Therefore, the system solves the problems from the following two aspects:

[0036] 1) According to the opening of the inlet flue gas regulating valve 7 of the lithium bromide absorption refrigeration unit, different set values are given to the control loop of the temperature transmitter T1 on the flue gas pipeline 5 at the outlet of the mixing box:

[0037] When the opening of the inlet flue gas regulating valve 7 of the lithium bromide absorption refrigeration unit becomes smaller, it indicates that the heat energy required by the lithium bromide absorption refrigeration unit 8 becomes smaller. At this time, the temperature set value of the T1 control loop is appropriately adjusted to reduce the heat energy entering the lithium bromide absorption refrigeration unit 8, which can relieve the reduction amplitude of the inlet flue gas regulating valve 7 of the lithium bromide absorption refrigeration unit and finally keep the valve at a reasonable opening.

[0038] Example: When the opening of the inlet flue gas regulating valve 7 of the lithium bromide absorption refrigeration unit is between 0 and 15%, the set value of the T1 control loop is T1a; when the opening of the inlet flue gas regulating valve 7 of the lithium bromide absorption refrigeration unit is between 15% and 40%, the set value of the T1 control loop is T1b; when the opening of the inlet flue gas regulating valve 7 of the lithium bromide absorption refrigeration unit is between 40% and 100%, the set value of the T1 control loop is T1c. Theoretically, T1a < T1b < T1c < 600 °C.

[0039] 2) When the opening degree of the imported flue gas regulating valve 7 of the lithium bromide absorption refrigeration unit is less than 10% or when the outlet temperature T1 of the air mixing box 4 reaches the high-temperature alarm set value (580 °C), the safety bypass flue gas exhaust switch valve 12 and the safety bypass flue gas inlet switch valve 16 are opened, and the safety bypass circulation of the lithium bromide absorption refrigeration unit 8 is started.

[0040] Start-up and control logic of the heat extraction bypass valve 3:

[0041] When starting the lithium bromide absorption refrigeration unit 8 and the RTO receives the unit operation enabling signal, the flue gas temperature T1 at the outlet of the air mixing box 4 is switched to automatic control, and the heat extraction bypass valve 3 is started to be adjusted. The adjustment logic is controlled by two loops: the furnace temperature transmitter T0 of the RTO regenerative combustion device 1 and the flue gas temperature T1 at the outlet of the air mixing box 4. The opening degree of the heat extraction bypass valve 3 is controlled by taking the lower value (LSEL) through comparing the output value of the adjustment loop of the furnace temperature transmitter T0 of the RTO regenerative combustion device 1 with the output value of the adjustment loop of the flue gas temperature T1 at the outlet of the air mixing box 4, so as to ensure that the outlet temperature T1 of the air mixing box 4 reaches the set value (T1a or T1b or T1c). The set value of the furnace temperature transmitter T0 of the RTO regenerative combustion device 1 is 850 °C.

[0042] Shutdown logic of the lithium bromide absorption refrigeration unit 8:

[0043] When the lithium bromide absorption refrigeration unit 8 stops, the safety bypass flue gas exhaust switch valve 12 and the safety bypass flue gas inlet switch valve 16 are opened after a 3-second delay, and the cooling bypass loop circulation is started; the adjustment loop of the flue gas temperature T1 at the outlet of the air mixing box 4 is switched to manual; the pressure adjustment loop of the flue gas pressure PT at the outlet of the air mixing box 4 remains automatic.

[0044] Only after the RTO regenerative combustion device 1 stops, the induced draft fan 10 stops, and the pressure adjustment loop of the flue gas pressure PT at the outlet of the air mixing box 4 stops adjusting.

[0045] It can be seen from the above that for the waste heat recovery process system of the RTO supporting the lithium bromide absorption refrigeration unit, in the context of traditional direct discharge of combustion flue gas or simple hot water recovery, the lithium bromide absorption refrigeration unit is added through the flue gas discharged from the RTO furnace to fully recover the heat energy, and the monitoring and control of the outlet temperature and pressure of the air mixing box are set. The opening degree of the heat extraction bypass valve is automatically adjusted according to the outlet temperature of the air mixing box to meet the constant temperature requirement of the lithium bromide absorption refrigeration unit. The opening degree of the air pressure balance regulating valve is automatically adjusted according to the outlet pressure of the air mixing box to meet the constant pressure requirement of the lithium bromide absorption refrigeration unit. At the same time, a safety bypass design is supported, a switching switch valve is set, and it can be switched at any time according to the working conditions. In the case of over-temperature of the driving heat source or failure of the lithium bromide absorption refrigeration unit, the process safety protection requirements of the production equipment are met and the heat energy utilization rate is improved.

Claims

1. A waste heat recovery process system for an RTO-equipped lithium bromide absorption refrigeration unit, connected to an RTO heat storage combustion device (1) and a lithium bromide absorption refrigeration unit (8), characterized in that: It comprises an air mixing box (4), wherein two air inlets of the air mixing box (4) are respectively connected to the high-temperature smoke exhaust port of the furnace of the RTO thermal storage combustion device (1) and the exhaust port of a lithium bromide absorption refrigeration unit (8) through pipelines; the air outlet of the air mixing box (4) is respectively connected to the air inlet of the lithium bromide absorption refrigeration unit (8) and the smoke inlet of a chimney (20) through pipelines; the smoke exhaust port of the lithium bromide absorption refrigeration unit (8) is also connected to the smoke inlet of the chimney (20) through a pipeline; and the smoke exhaust port at the bottom of the RTO thermal storage combustion device (1) is connected to the smoke inlet of the chimney (20) through a pipeline.

2. The RTO supporting lithium bromide absorption refrigeration unit waste heat recovery process system according to claim 1 is characterized in that: The high-temperature smoke exhaust port of the furnace of the RTO thermal storage combustion device (1) is connected to the air inlet of the air mixing box (4) through the RTO heat extraction bypass smoke pipeline (2); a heat extraction bypass valve (3) is provided on the RTO heat extraction bypass smoke pipeline (2); and the bottom smoke exhaust port of the RTO thermal storage combustion device (1) is connected to the smoke inlet of the chimney (20) through the bottom smoke exhaust pipeline (14) of the RTO thermal storage combustion device.

3. The RTO supporting lithium bromide absorption refrigeration unit waste heat recovery process system according to claim 1 is characterized in that: A temperature transmitter is provided at the air outlet of the air mixing box (4).

4. The RTO supporting lithium bromide absorption refrigeration unit waste heat recovery process system according to claim 1 is characterized in that: The lithium bromide absorption refrigeration unit (8) is provided with a lithium bromide absorption refrigeration unit chilled water outlet pipeline (17), and a temperature transmitter is provided on the lithium bromide absorption refrigeration unit chilled water outlet pipeline (17).

5. The RTO supporting lithium bromide absorption refrigeration unit waste heat recovery process system according to claim 2 is characterized in that: The air outlet of the mixing box (4) is connected to a mixing box outlet flue gas pipeline (5), and the mixing box outlet flue gas pipeline (5) is connected to an air inlet of a lithium bromide absorption refrigeration unit (8) through a lithium bromide absorption refrigeration unit inlet flue gas pipeline (6), and a lithium bromide absorption refrigeration unit inlet flue gas regulating valve (7) is provided on the lithium bromide absorption refrigeration unit inlet flue gas pipeline (6).

6. The RTO supporting lithium bromide absorption refrigeration unit waste heat recovery process system according to claim 5 is characterized in that: The flue gas pipeline (5) at the outlet of the air mixing box is also connected to the bottom flue gas pipeline (14) of the RTO thermal storage combustion device through a safety bypass flue gas pipeline (13), and a safety bypass flue gas switch valve (12) is provided on the safety bypass flue gas pipeline (13).

7. The RTO supporting lithium bromide absorption refrigeration unit waste heat recovery process system according to claim 5 is characterized in that: The smoke exhaust port of the lithium bromide absorption refrigeration unit (8) is connected to the lithium bromide absorption refrigeration unit outlet smoke pipeline (9) and the induced draft fan (10) in sequence; the air outlet of the induced draft fan (10) is connected to an outlet pipeline (21); the outlet pipeline (21) is connected to two routes, one of which is connected to the smoke inlet of the chimney (20) through a wind pressure balance regulating pipeline (18); and the other is connected to the air inlet of the air mixing box (4) through a smoke return pipeline (11); and a wind pressure balance regulating valve (19) is provided on the wind pressure balance regulating pipeline (18).

8. The RTO supporting lithium bromide absorption refrigeration unit waste heat recovery process system according to claim 7 is characterized in that: The flue gas pipeline (9) at the outlet of the lithium bromide absorption refrigeration unit is connected to the flue gas exhaust pipeline (14) at the bottom of the RTO thermal storage combustion device via a safety bypass flue gas inlet pipeline (15), and a safety bypass flue gas inlet switch valve (16) is provided on the safety bypass flue gas inlet pipeline (15).

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