Industrial frozen brine circulating tank with decarburization tower

Abstract

The utility model discloses an industrial frozen saline water circulating tank with a decarburization tower, which comprises the decarburization tower, the inlet end of the decarburization tower is connected with a frozen saline water return pipe of a frozen saline water circulating system, and the outlet end of the decarburization tower is connected with a top water return port of a frozen saline water tank body of the frozen saline water circulating system; the air blower is arranged on an air inlet in the bottom of the decarbonization tower; the combustible alarm apparatus is arranged on the decarburization tower, and the detection end of the combustible alarm apparatus is arranged at the inlet end of the decarburization tower; and the plc is respectively connected with the signal output end of the combustible alarm instrument and the start-stop control end of the air blower.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production equipment, in particular to an industrial refrigerated brine circulation tank with a decarbonization tower. Background Art

[0002] In current chemical production processes, chilled brine cryogenics are a common cooling method. The main process is as follows: Cryogenics are based on the phenomenon of freezing point depression, meaning the freezing point of a solution is lower than that of pure water. In industrial chilled brine systems, water is typically mixed with a specific salt, calcium chloride, in a specific ratio to form a chilled brine solution.

[0003] The mixed chilled brine solution begins to freeze at relatively low temperatures. This is because salt dissolving in water disrupts the hydrogen bond network between water molecules, lowering the temperature required for ice crystal formation. The most commonly used medium is -35°C chilled brine. After the chilled brine is prepared to a certain concentration in a circulation tank, it is transported to the refrigeration unit using a chilled brine circulation pump. After being cooled by the refrigeration unit, the chilled brine enters the chemical cryogenic heat exchanger for heat exchange. After the heat exchange is completed, the chilled brine returns to the chilled brine circulation tank through a pipeline, and the cycle repeats, completing the cryogenic exchange in the chemical process.

[0004] To ensure the normal circulation of the chilled brine system, an open chilled brine storage tank is usually set up. During the circulation of the chilled brine system, the system can absorb carbon dioxide from the air. The dissolved carbon dioxide reacts with water to form carbonic acid. Carbonic acid is a weak acid that can further dissociate into hydrogen ions and bicarbonate ions. As the hydrogen ion concentration increases, the acidity of the aqueous solution increases, resulting in a decrease in pH. If ionization continues, bicarbonate can further decompose into more hydrogen ions and carbonate ions. After the chilled brine absorbs carbon dioxide, the pH value of the chilled brine solution will naturally decrease due to the generation of these acidic substances. The chilled brine is acidic, which will have the following effects on the equipment:

[0005] 1. Accelerate the corrosion rate of metal materials, especially copper, iron, etc. In cooling systems or heat exchangers, acidic conditions will corrode pipes, heat exchanger walls and other metal components, causing equipment damage, leakage and shortening its service life.

[0006] Second, certain minerals and salts are more likely to precipitate from solution, forming deposits. For example, hardness components such as calcium and magnesium may react with acids to form insoluble salts, which can deposit on the surface of heat exchangers or within pipes, reducing heat transfer efficiency, causing localized overheating, and even clogging pipes.

[0007] In traditional production processes, in order to maintain an appropriate pH level, regular monitoring and adjustment are usually required. A common practice is to add alkaline substances such as sodium hydroxide to the system to neutralize the acidity. However, this can lead to other problems, such as the formation of insoluble precipitates such as calcium hydroxide that are deposited on the surface of the heat exchanger or in the pipes, resulting in poor heat transfer performance of the equipment and electrochemical corrosion. Utility Model Content

[0008] In view of the above technical problems, the utility model provides an industrial refrigerated brine circulation tank with a decarbonization tower.

[0009] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows:

[0010] An industrial refrigerated brine circulation tank with a decarbonization tower, comprising:

[0011] The decarbonization tower has an inlet end connected to the chilled brine return pipe of the chilled brine circulation system, and an outlet end connected to the top return port of the chilled brine tank body of the chilled brine circulation system;

[0012] A blower is provided at the air inlet at the bottom of the decarbonization tower;

[0013] A combustible alarm is installed on the decarbonization tower, and its detection end is installed at the inlet end of the decarbonization tower;

[0014] The plc controller is connected to the signal output terminal of the combustible alarm instrument and the start and stop control terminal of the blower respectively.

[0015] The refrigerated brine circulation system comprises:

[0016] A chilled brine circulation pump, the inlet end of which is connected to the water outlet of the chilled brine tank body through a chilled brine circulation pump inlet pipe;

[0017] The inlet end of the refrigeration unit is connected to the outlet end of the chilled brine circulation pump through the circulation pump outlet pipe;

[0018] The shell side inlet of the cooler is connected to the evaporator outlet of the refrigeration unit, and the shell side outlet is connected to the inlet end of the decarbonization tower through the chilled brine return pipe.

[0019] A vent pipe is provided on the top of the decarbonization tower.

[0020] The beneficial effects of the present invention are as follows: the present invention utilizes the filler installed in the decarbonization tower, and the chilled brine return water enters from the top of the tower, is evenly distributed and flows through the filler layer, and a blower is set at the bottom of the tower to provide a counter-flowing air flow and counter-flow contact with the water flow. The filler increases the contact area between the gas and liquid phases, which is beneficial to the mass transfer of CO2 and promotes the release of CO2 in the chilled brine into the gas phase. The air blown in by the blower is discharged from the top of the decarbonization tower, wherein the designed flow flux of the decarbonization tower matches the water volume of the chilled brine circulation system, ensuring the stable circulation of the chilled brine system. The present invention sets a combustible material detector at the chilled brine inlet of the decarbonization tower, which is interlocked with the PLC controller and the blower setting. The interlocking logic is as follows: when the alarm value of the combustible material detector is ≥5PPM, the blower automatically stops running, ensuring that in the event of a subsequent user's combustible material heat exchanger leaking, when combustible material leaks into the chilled brine system, the detector will promptly issue an alarm, and the PLC interlock will stop the blower to prevent the blown air from fully combining with the combustible material and causing the risk of fire and explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 It is a schematic diagram of the utility model;

[0023] In the figure: 1- chilled brine circulation tank body; 2- chilled brine circulation pump inlet pipe; 3- chilled brine circulation pump; 4- circulation pump outlet pipe; 5- refrigeration unit; 6- cooler; 7- material pipeline; 8- chilled brine return pipe; 9- decarbonization tower; 10- blower; 11- vent pipe; 12- PLC controller; 13- combustible alarm. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0025] like Figure 1 As shown, an industrial chilled brine circulation tank with a decarbonization tower includes: a decarbonization tower 9, whose inlet end is connected to the chilled brine return pipe 8 of the chilled brine circulation system, and the outlet end is connected to the top return port of the chilled brine tank body 1 of the chilled brine circulation system; a blower 10, which is arranged on the bottom air inlet of the decarbonization tower 9; a combustible alarm 13, which is arranged on the decarbonization tower 9, and its detection end is arranged at the inlet end of the decarbonization tower 9; a PLC controller 12, which is respectively connected to the signal output end of the combustible alarm 13 and the start and stop control end of the blower 10.

[0026] like Figure 1 As shown, the chilled brine circulation system includes: a chilled brine circulation pump 3, whose inlet end is connected to the water outlet of the chilled brine tank body 1 through a chilled brine circulation pump inlet pipe 2; a refrigeration unit 5, whose inlet end is connected to the outlet end of the chilled brine circulation pump 3 through a circulation pump outlet pipe 4; a cooler 6, whose shell side inlet is connected to the evaporator outlet of the refrigeration unit 5, and the shell side outlet is connected to the inlet end of the decarbonization tower 9 through a chilled brine return pipe 8, and a vent pipe 11 is provided on the top of the decarbonization tower 9.

[0027] When the present invention is in use, the prepared chilled brine with qualified concentration is sent to the chilled brine circulation tank body 1, the relevant valves on the chilled brine circulation pipeline are opened, the chilled brine circulation pump 3 is turned on, the refrigeration unit 5 is turned on to establish the chilled brine system circulation, the blower 10 is turned on to run, and the PLC controller 12 is interlocked and put into use. The working principle is: based on the solubility equilibrium of gas in liquid and the physical and chemical process of gas transmission, the amount of gas dissolved in the liquid is proportional to the partial pressure of the gas in the gas above it, and the chilled brine return water flows to the chilled brine circulation tank body 1 after passing through the decarbonization tower 9. The CO2 partial pressure in the gas phase is increased by the blower 10 at the bottom of the decarbonization tower 9, which promotes the release of CO2 in the chilled brine into the gas phase and is then discharged from the top of the decarbonization tower 9. The CO2 content of the chilled brine after being treated by the decarbonization tower 9 is significantly reduced, and the pH value is stably maintained between 6 and 8, which reduces the risk of corrosion to the equipment, improves the water quality, avoids the blockage and corrosion of subsequent heat exchange equipment, and achieves good economic benefits.

[0028] It should be understood that the above-described specific embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the scope of protection of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. An industrial chilled brine circulation tank with a decarbonization tower, characterized in that: include: A decarbonization tower (9), the inlet end of which is connected to the chilled brine return pipe (8) of the chilled brine circulation system, and the outlet end of which is connected to the top return port of the chilled brine tank body (1) of the chilled brine circulation system; A blower (10) is provided at the air inlet at the bottom of the decarbonization tower (9); A combustible alarm (13) is provided on the decarbonization tower (9), and a detection end thereof is provided at the inlet end of the decarbonization tower (9); The PLC controller (12) is connected to the signal output terminal of the combustible alarm (13) and the start / stop control terminal of the blower (10) respectively.

2. The industrial chilled brine circulation tank with a decarbonization tower according to claim 1, characterized in that: The refrigerated brine circulation system comprises: A chilled brine circulation pump (3), the inlet end of which is connected to the water outlet of the chilled brine tank body (1) via a chilled brine circulation pump inlet pipe (2); A refrigeration unit (5), the inlet end of which is connected to the outlet end of the chilled brine circulation pump (3) via a circulation pump outlet pipe (4); The shell side inlet of the cooler (6) is connected to the evaporator outlet of the refrigeration unit (5), and the shell side outlet is connected to the inlet end of the decarbonization tower (9) through the refrigerated brine return pipe (8).

3. The industrial chilled brine circulation tank with a decarbonization tower according to claim 1, characterized in that: A vent pipe (11) is provided at the top of the decarbonization tower (9).

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