Control method of absorption refrigerating machine

Abstract

The invention provides a control method of absorption refrigerating machine which permits the utilizing of a heat source surely in accordance with a preferential order and prevents the temperature of cold water, supplied from an evaporator, from overshooting even when a load is suddenly changed. When a cold water temperature T, measured by a temperature sensor 19, is lowered from a main set value or 7 DEG C upon forcibly controlling the flow rate of waste hot-water, supplied from a low temperature heat source supplying tube 18 into a low-temperature water regenerator 6, so as to achieve the maximum value, PID control, wherein 6 DEG C lower than the main set value of 7 DEG C is made standard, is re-started to control the flow rate of the waste hot-water, supplied from the low-temperature heat source supplying tube 18 into the low-temperature water regenerator 6. When the cold water temperature T, measured by the temperature sensor 19, becomes 8 DEG C, higher than 7 DEG C, upon controlling forcibly the flow rate of exhaust gas, supplied from a high-temperature heat source supplying tube 16 into a high-temperature regenerator 1, so as to be zero, the PID control, based on the main set value of 7 DEG C, is re-started to control the flow rate of exhaust gas, supplied from the high-temperature heat source supplying tube 16 into the high-temperature regenerator 1.

Description

technical field [0001] The present invention relates to an absorption refrigerator (including an absorption chiller) having two heat sources for generating refrigerant vapor by heating an absorption liquid. Background technique [0002] As we all know, the high temperature generated by burning natural gas, petroleum, etc. and the waste heat of power generation and waste heat heating system are used to heat the absorption liquid, and evaporate and separate the refrigerant from the absorption liquid to generate refrigerant vapor and concentrated absorption liquid. Absorption refrigeration machine. [0003] Also, absorption engines using waste heat supplied from waste warm water, exhaust gas, etc., power generation by gas engines, etc., and waste heat from waste heat heating systems as heat sources are also known. [0004] Moreover, since customers use one of the ways of using heat with priority at any time, it is necessary to make full use of the heat energy of the heat sourc...

AI Technical Summary

Problems solved by technology

[0006] According to the control method proposed in Japanese Patent Application No. 2000-074173, the heat sources can be used according to the order of priority. However, when PID (proportional-integral-derivative control) controls the heating amount of the absorption liquid, a large control adjustment range is set. Or when setting a longer integral time, when the load changes rapidly, during the time of closing the fuel supply pump or confirming the full closing time, sometimes failures such as excessive cooling of the cold water and abnormal stop of the device may occur, so it is necessary to provide a The control method to avoid these failures is the problem that should be solved

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