Circulating ammonia water refrigeration technology
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If lithium bromide refrigeration is carried out using preheating with circulating ammonia water, will it have an impact on the recovery of gas from chemical processes? Will it affect the preheating of the rising tube?
A refrigeration unit is added after the gas-liquid separator; the heat from the circulating ammonia water (around 72°C) is used to replace the burner of the refrigeration unit, enabling the refrigeration unit to perform cooling. The cooled water can be connected to the main outlet valve or the main return valve of the original refrigeration unit (for pre-cooling of the cooled water). The cooling effect of this refrigeration unit is 5–7°C (16–23°C). After heat exchange with the circulating ammonia water, it enters a mechanical clarification tank where tar and ammonia water are separated, before being reused in the system.
The cooling water circuit is divided into two sections, with the pipes for the cover plates connected in series to feed into the refrigerator. The waste heat from the circulating water is used to replace the combustion unit of the refrigerator; the temperature of the circulating water entering the refrigerator is around 73°C, while the outlet temperature is approximately 67°C. This circulating water operates independently from the regular circulating water, and it is possible to shut down the refrigerator in winter by connecting this circulating water to the system via a switching valve. The cold water produced by the refrigerator can be fed into either the main outlet pipe or the main return pipe of the original refrigerator (for pre-cooling). The cooling effect achieved by the refrigerator is 5–7°C (16–23°C).