CN-121977368-A - Self-circulation chlorine cooling system and cooling method thereof

CN121977368ACN 121977368 ACN121977368 ACN 121977368ACN-121977368-A

Abstract

The invention provides a self-circulation chlorine cooling system and a cooling method thereof, the system comprises a chlorine cooler and a shell-and-tube condenser, the tube pass of the chlorine cooler is used for introducing high-temperature chlorine and discharging the cooled chlorine, the chlorine cooler shell side is internally packaged with liquid-state refrigerant which is used for absorbing heat transferred by high-temperature chlorine through the pipe wall to generate evaporation phase change and is converted into gas from liquid state. The inlet of the shell-and-tube condenser tube pass is connected with a water supply pipe and the outlet of the cooling water tube network at the user side and is connected with a water return pipe, the shell-and-tube condenser tube pass is used for containing gaseous refrigerant from a chlorine cooler, and cooling water absorbs the heat of the gaseous refrigerant to enable the gaseous refrigerant to undergo condensation phase change, and the gaseous refrigerant is converted into liquid state again. The invention has the advantages of no pump self-circulation, compact structure, high heat exchange efficiency, good multi-stage isolation safety, simple operation and maintenance and wide applicable working condition range.

Inventors

GONG BEN
LU YANCONG
XIONG KAN
LIU MENGLING
WANG YANG

Assignees

武汉新世界制冷工业有限公司

Dates

Publication Date: 20260505
Application Date: 20260330

Claims (10)

1. The utility model provides a self-loopa chlorine cooling system, includes chlorine cooler (1) and shell-and-tube condenser (2), its characterized in that: The chlorine cooler (1) comprises a chlorine cooler tube side (11) and a chlorine cooler shell side (12), wherein the chlorine cooler tube side (11) is used for introducing high-temperature chlorine and discharging the cooled chlorine, a liquid-state refrigerant is packaged in the chlorine cooler shell side (12), and the liquid-state refrigerant is used for absorbing heat transferred by the high-temperature chlorine through a tube wall to generate evaporation phase change and is converted from a liquid state to a gaseous state; The shell-and-tube condenser (2) comprises a shell-and-tube condenser tube pass (21) and a shell-and-tube condenser tube pass (22), wherein the inlet of the shell-and-tube condenser tube pass (21) is connected with a water supply pipe of a user side cooling water tube network, and the outlet of the shell-and-tube condenser tube pass is connected with a water return pipe of the cooling water tube network so as to continuously feed cooling water, the shell-and-tube condenser tube pass (22) is used for accommodating gaseous refrigerant from the chlorine cooler (1), and the cooling water absorbs the heat of the gaseous refrigerant to cause the gaseous refrigerant to undergo condensation phase change, and the gaseous refrigerant is reconverted into a liquid state; The chlorine cooler is characterized in that a first connecting pipeline (4) is arranged between an outlet of the chlorine cooler shell side (12) and an inlet of the shell-and-tube condenser shell side (22), a second connecting pipeline (5) is arranged between an outlet of the shell-and-tube condenser shell side (22) and an inlet of the chlorine cooler shell side (12), the first connecting pipeline (4), the shell-and-tube condenser shell side (22) and the second connecting pipeline (5) are sequentially communicated end to end, so that a closed refrigerant (3) self-circulation loop is formed together, and the refrigerant (3) is used as a circulation driving force by means of pressure difference and/or gravity generated by phase change in the self-circulation loop.
2. The self-circulating chlorine cooling system according to claim 1, wherein the refrigerant (3) is a low boiling point working medium having a boiling point lower than the high temperature chlorine gas temperature at normal atmospheric pressure, and the boiling point range thereof is-50 ℃ to 0 ℃.
3. The self-circulating chlorine gas cooling system according to claim 2, wherein the refrigerant (3) is selected from one or a mixture of two or more of R22, R134a, R407C.
4. The self-circulation chlorine cooling system according to claim 1, wherein the temperature of high-temperature chlorine introduced at the inlet of the chlorine cooler tube (11) is 100-200 ℃, and the temperature of chlorine discharged at the outlet of the chlorine cooler tube (11) is reduced to 30-50 ℃ after the chlorine cooler (1) cools.
5. The self-circulating chlorine gas cooling system of claim 4, wherein the temperature of the high temperature chlorine gas is 150 ℃ and the temperature of the chlorine gas is reduced to 40 ℃ after cooling.
6. The self-circulating chlorine cooling system according to claim 1, wherein in the chlorine cooler (1), chlorine gas circulates in a chlorine cooler tube side (11), a refrigerant (3) circulates in a chlorine cooler shell side (12), in the shell-and-tube condenser (2), cooling water circulates in a shell-and-tube condenser tube side (21), and the refrigerant (3) circulates in a shell-and-tube condenser tube side (22), thereby forming a multistage isolation structure for indirect heat exchange between the chlorine gas and the cooling water by refrigerant phase change heat transfer.
7. The self-circulating chlorine cooling system according to claim 1, characterized in that the shell-and-tube condenser (2) is arranged above the chlorine cooler (1) so that condensed liquid refrigerant can naturally flow back to the bottom of the chlorine cooler shell side (12) through the second connecting pipeline (5) under the action of gravity.
8. The self-circulating chlorine gas cooling system of any of claims 1-7, wherein the self-circulating loop is a sealed system, wherein under normal operating conditions, the bottom of the chlorine gas cooler shell side (12) always holds liquid refrigerant, and the shell-and-tube condenser shell side (22) continuously receives and condenses gaseous refrigerant.
9. A method of cooling using the self-circulating chlorine gas cooling system of any of claims 1 to 8, comprising the steps of: Step S1, continuously introducing high-temperature chlorine with the temperature of 100-200 ℃ into a chlorine cooler tube path (11) of the chlorine cooler (1), transferring heat of the high-temperature chlorine to a liquid refrigerant in a chlorine cooler shell path (12) through a tube wall, enabling the liquid refrigerant to reach a boiling point after absorbing the heat and evaporating the liquid refrigerant into a gaseous refrigerant, and synchronously cooling the high-temperature chlorine to 30-50 ℃; step S2, as the evaporation process continues, gaseous refrigerant in the shell side (12) of the chlorine gas cooler is continuously accumulated, the pressure of the gaseous refrigerant is gradually increased and exceeds the pressure in the shell side (22) of the shell-and-tube condenser, and the gaseous refrigerant automatically flows into the shell side (22) of the shell-and-tube condenser through the first connecting pipeline (4) under the driving of the pressure difference; step S3, cooling water from a user side cooling water pipe network continuously flows through a shell-and-tube condenser tube path (21) of the shell-and-tube condenser (2), and absorbs condensation latent heat released by the gaseous refrigerant in the shell path (22) of the shell-and-tube condenser to enable the gaseous refrigerant to be condensed into liquid refrigerant; s4, under the action of gravity and/or pressure difference, the condensed liquid refrigerant automatically flows back to the inlet of the chlorine cooler shell side (12) from the outlet of the shell-and-tube condenser shell side (22) through the second connecting pipeline (5), is supplemented to the bottom of the chlorine cooler shell side (12), and continuously participates in the next round of evaporation and heat absorption; the steps S1 to S4 are continuously circulated, and the refrigerant continuously completes phase change thermodynamic cycle of evaporation, gaseous delivery, condensation and liquid reflux in a closed self-circulation loop, so as to realize continuous cooling of high-temperature chlorine.
10. The method according to claim 9, wherein the temperature of the high-temperature chlorine gas in the step S1 is 150 ℃, and the temperature of the chlorine gas is reduced to 40 ℃ after cooling.

Description

Self-circulation chlorine cooling system and cooling method thereof Technical Field The invention relates to the technical field of chlorine cooling, in particular to a self-circulation chlorine cooling system and a cooling method thereof. Background In the industrial production process of chlor-alkali, the pressure of chlorine generated by an electrolytic device such as an ionic membrane electrolytic tank or a diaphragm electrolytic tank is low, multistage pressurization is needed, and in the pressurization process, the temperature between stages is generally 80-200 ℃, and the pressure contains a large amount of moisture and trace impurities. Therefore, the high-temperature chlorine is an indispensable key link in the chlor-alkali production process, and the cooling effect directly influences the safe operation and the product quality of the subsequent procedures. At present, a common chlorine cooling mode in industry mainly adopts a tube type heat exchanger, circulating cooling water is used as a cooling medium, cooling is realized through heat convection between water and chlorine, and the scheme can meet the basic requirement of chlorine cooling to different degrees, but has a plurality of non-negligible problems in practical engineering application. More critical is the security issue. The chlorine and water can react at normal temperature and normal pressure to generate hydrochloric acid and hypochlorous acid, and the reaction is more severe at high temperature. If the cooling water system is leaked through a pipeline, the cooling water is directly contacted with chlorine, equipment corrosion and product pollution are caused if the cooling water system is light, and safety accidents are possibly caused if the cooling water system is heavy. In addition, the mechanical components such as the pump body, the valves and the like which are operated in a large quantity in the traditional system have the risk of sealing failure, and once leakage occurs, chlorine-containing media are escaped to cause harm to operators and the surrounding environment. In view of the above state of the art, there is a need in the industry for a chlorine cooling solution that is more compact in structure, less energy-consuming to operate, safer and stable in temperature control. Disclosure of Invention The invention aims to solve the defects, and aims to provide a self-circulation chlorine cooling system and a cooling method thereof, wherein the system utilizes the physical phase change process of liquid evaporation heat absorption and gaseous condensation heat release of a refrigerant to form natural circulation driving force in a closed loop, can realize continuous and efficient cooling of high-temperature chlorine without arranging an additional refrigerant circulation pump, and simultaneously establishes a multistage isolation barrier between the chlorine and cooling water to fundamentally eliminate the potential safety hazard of direct contact of the chlorine and the cooling water. In order to achieve the above object, the present invention provides a self-circulating chlorine gas cooling system, comprising a chlorine gas cooler and a shell-and-tube condenser, both of which adopt a shell-and-tube heat exchanger structure. The chlorine cooler comprises a chlorine cooler tube pass and a chlorine cooler shell pass, wherein the chlorine cooler tube pass is used for introducing high-temperature chlorine and discharging the cooled chlorine, and a liquid-state refrigerant is packaged in the chlorine cooler shell pass and used for absorbing heat transferred by the high-temperature chlorine through tube walls to generate evaporation phase change, and the liquid-state refrigerant is changed into a gaseous state. The shell-and-tube condenser comprises a shell-and-tube condenser tube side and a shell side of the shell-and-tube condenser, wherein an inlet of the shell-and-tube condenser tube side is connected with a water supply pipe of a cooling water tube network at the user side, and an outlet of the shell-and-tube condenser tube side is connected with a water return pipe so as to continuously introduce cooling water, the shell side of the shell-and-tube condenser tube side is used for containing gaseous refrigerant from a chlorine cooler, and the cooling water absorbs the heat of the gaseous refrigerant to enable the gaseous refrigerant to undergo condensation phase change, and the gaseous refrigerant is converted into a liquid state again. A first connecting pipeline is arranged between the outlet of the shell pass of the chlorine cooler and the inlet of the shell pass of the shell-and-tube condenser, and a second connecting pipeline is arranged between the outlet of the shell pass of the shell-and-tube condenser and the inlet of the shell pass of the chlorine cooler. The chlorine cooler shell pass, the first connecting pipeline, the shell-and-tube condenser shell pass and the second connecting pipeline are sequentially communicated