Closed circulation system for heating of high-temperature hot water in upper section of primary cooler

Abstract

The invention relates to a closed circulation system for heating of high-temperature hot water in the upper section of a primary cooler. The closed circulation system comprises a closed circulation system part consisting of the primary cooler, a heating water supply pipeline, a heating user, a heating water returning pipeline and a hot water circulation pump; a high-temperature hot water outlet atthe upper section of the primary cooler is connected with a hot water flow inlet of the heating user through the heating water supply pipeline; a hot water flow outlet of the heating user is connected with a low-temperature hot water inlet at the upper section of the primary cooler through the heating water returning pipeline; the hot water circulation pump is arranged on the heating water returning pipeline; the heating water returning pipeline is also provided with an expansion water tank; the top of the expansion water tank is provided with a pressure release valve; the upper part of the expansion water tank is provided with a compressed nitrogen inlet; the compressed nitrogen inlet is connected with an external compressed nitrogen source through a nitrogen pipeline; the nitrogen pipeline is provided with a nitrogen pressure regulating valve; and the expansion water tank is also provided with a liquid liquidometer I. The closed circulation system provided by the invention can prevent circulating water loss and potential energy loss caused by open circulation of the high-temperature hot water at the upper section of the primary cooler and can also prevent the common problems about water loss and unstable pressure in a closed circulation process.

Description

technical field [0001] The invention relates to the technical field of energy saving and environmental protection in the coking industry, in particular to a closed circulation system in which high-temperature hot water in the upper section of a primary cooler is used for heating. Background technique [0002] In the process of recovering and purifying the coking gas produced in the coking industry, the raw coal gas from the gas collecting pipe at about 80-84°C must be cooled to 20-22°C in the primary cooler. The primary cooler generally uses a horizontal tube indirect primary cooler, and uses industrial circulating water and low-temperature water to cool the raw gas in sections. When there is a factory area that needs heating or a user that needs high-temperature hot water, the primary cooler can adopt a three-stage structure of upper, middle, and lower sections. The temperature of the circulating hot water in the upper section leaving the primary cooler can reach 75-78°C, w...

AI Technical Summary

Problems solved by technology

[0006] The Chinese patent with the patent number CN205842824U discloses a "heat recovery and utilization device for the heating water waste heat of the primary cooler in the coking plant", which adopts an open cycle with a heating pool. The disadvantage is that the high-temperature hot water in the upper section of the primary cooler will eventually Entering the open circulating pool, a high-power water pump is required to send the circulating water to the upper section of the primary cooler again. During this process, there will be volatilization loss of the circulating water, and a large amount of electric energy will be consumed to make the circulating water regain nearly 40 Potential energy of m

Images