Smoke exhaust heat utilization device of directly-fired triple effect machine

Abstract

The invention relates to a smoke exhaust heat utilization device of a directly-fired triple effect machine, comprising a directly-fired high pressure generator (9), a medium pressure generator (11), a low pressure generator (13), a high temperature solution heat exchanger (8), a medium temperature solution heat exchanger (7) and a low temperature solution heat exchanger (5). A smoke outlet pipe (10) of the directly-fired high pressure generator (9) is internally and additionally provided with a smoke exhaust heat utilization device (15); the shell side of the smoke exhaust heat utilization device (15) is sequentially provided with a high temperature smoke heat exchange tube bundle (16), a medium temperature smoke heat exchange tube bundle (17) and a low temperature smoke heat exchange tube bundle (18) upwards along the smoke flow direction; the tube side of the high temperature smoke heat exchange tube bundle (16) is arranged in series on a solution pipeline for entering and exiting the directly-fired high pressure generator (9); the tube side of the medium temperature smoke heat exchange tube bundle (17) is arranged in series on a solution pipeline for entering the medium pressure generator (11); and the tube side of the low temperature smoke heat exchange tube bundle (18) is arranged in series on a solution pipeline for entering the low pressure generator (13). The inventioncan further improve the fuel heat utilization ratio of the directly-fired triple effect machine, reduce the temperature of smoke exhaust and reduce the heat loss of smoke exhaust.

Description

(1) Technical field [0001] The invention relates to a direct-fired three-effect lithium bromide absorption type cold (hot) water unit exhaust heat utilization device. It belongs to the technical field of refrigeration equipment. (2) Background technology [0002] The previous direct-fired three-effect lithium bromide absorption cold (hot) water units (including chillers and cold and hot water units, the same below) (hereinafter referred to as direct-fired three-effect units) are as follows: figure 1 As shown, the heat of condensation of refrigerant vapor is utilized many times. Compared with the general steam double-effect lithium bromide absorption cold (hot) water unit, a high-pressure generator and a solution heat exchanger are added. The solution is heated separately in high-pressure, medium-pressure, and low-pressure generators. The high-pressure generator is heated by heat sources such as fuel oil, gas or high-temperature flue gas. The refrigerant steam generated hea...

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Problems solved by technology

[0003] Since the solution temperature of the direct-fired high-pressure generator of the direct-fired three-effect machine exceeds 200°C, and even reaches above 220°C, the exhaust gas temperature of the direct-fired high-pressure generator is much higher than that of the direct-fired double-effect machine, and even reaches the smoke exhaust temperature above 250°C. The temperature is more than 4% higher than that of the direct-fired double-effect machine, which greatly increases the heat loss of the flue gas

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