Direct-burning lithium bromide absorbing cold hot water unit capable of recycling smoke waste heat

Abstract

The invention relates to a direct-burning lithium bromide absorbing cold hot water unit capable of recycling smoke waste heat. A smoke condensation heat exchanger (18) is arranged at a smoke discharging outlet pipe of a direct-burning high pressure generator, an outlet refrigerant water pipeline of a refrigerant pump (22) is divided into two branches, one branch is connected with an evaporator (4) through a refrigeration refrigerant water valve (15), and the other branch is connected with the smoke condensation heat exchanger (18) through a heating refrigerant water inlet valve (14) and then connected and joined with a pipeline at the rear side of the refrigeration refrigerant water valve (15) through a heating refrigerant water outlet valve (25) or connected with the evaporator (4) alone. A solution pump outlet dilute solution pipeline is divided into two branches, one branch of dilute solution is heated through a low-temperature solution heat exchanger and a high-temperature solution heat exchanger to be connected with the direct-burning high pressure generator, and the other branch of dilute solution is connected with a smoke condensation heat exchanger through a dilute solution inlet valve to be connected and joined with a pipeline at the rear side of the high-temperature solution heat exchanger through a dilute solution outlet valve or connected with the direct-burning high pressure generator alone. The direct-burning lithium bromide absorbing cold hot water unit can fully use the smoke heat and improves efficiency.

Description

technical field [0001] The invention relates to a direct-fired lithium bromide absorption cold and hot water unit. It belongs to the technical field of air conditioning equipment. Background technique [0002] At present, direct-fired lithium bromide absorption chillers such as figure 1 As shown, it consists of direct-fired high-pressure generator 1, low-pressure generator 2, condenser 3, evaporator 4, absorber 5, low-temperature solution heat exchanger 6, high-temperature solution heat exchanger 7, solution bypass valve 8, refrigerant The steam valve 9, the solution pump 21, the refrigerant pump 22, the valve, the control system (not shown in the figure) and the pipelines connecting the various components are composed. When the unit is running in the cooling condition, the dilute solution of the absorber is boosted by the solution pump and then enters the low-temperature solution heat exchanger 6 and the high-temperature solution heat exchanger 7 in series and then enters...

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Problems solved by technology

[0003] The current direct-fired lithium bromide absorption chiller and hot water unit has a direct-fired high-voltage generator exhaust gas temperature of about 170°C in cooling conditions, and a direct-fired high-pressure generator exhaust gas temperature of around 155°C in heating conditions. The flue gas contains part of water vapor, and the saturation temperature of water vapor is about 57°C. The sensible heat of this part of flue gas and the latent heat of condensation of water vapor can account for 10% of the calorific value of fuel combustion. Currently, direct emission cannot be used, resulting in a large amount of smoke. The waste of gas waste heat, while generating heat pollution emissions

Since the temperature of hot water produced under heating conditions is equivalent to the saturation temperature of water vapor in the flue gas, it is difficult to recover this part of waste heat by ordinary direct heat exchange technology. The efficiency of direct-fired lithium bromide absorption chiller and hot water unit under heating conditions, and the realization of comprehensive economic and social benefits of energy saving and emission reduction have become one of the important topics of current research

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