JP3188217U - Waste acid cooling system - Google Patents

Abstract

A waste acid cooling apparatus capable of improving the overall cooling processing efficiency is provided.
A waste acid cooling device is connected to a first storage tank 10 that stores a low-temperature fluid and a second storage tank 20 that stores an acidic fluid. The waste acid cooling device includes a storage cylinder 30, a heat exchanger 40, a first pipe 50, and a second pipe 60. The storage cylinder 30 is connected to the second storage tank 20 and includes a first temperature sensor 33 and a volume flow meter 34. The heat exchanger 40 is formed such that the cryogenic fluid and the acidic fluid flow in without contacting each other. The first pipe 50 has one end connected to the first storage tank 10 and the other end attached to the heat exchanger 40, and guides the low temperature fluid to the heat exchanger 40. One end of the second pipe 60 is connected to the housing cylinder 30, penetrates through the heat exchanger 40, and the other end is connected to the discharge port 61.
[Selection] Figure 2

Description

  The present invention relates to a chemical treatment apparatus, and more particularly to a waste acid cooling apparatus.

  In steelmaking and machining processes, sulfuric acid solution is usually used as the main pickling solution to remove iron rust on metal surfaces. However, the pickling process forms ferrous sulfate in the course of work. When the content of ferrous sulfate in the pickling solution reaches a certain level and becomes saturated, the action of removing rust is lost. At that time, if the pickling solution becomes waste acid and is not replaced, The work cannot be continued.

  Among them, the solubility of ferrous sulfate in the pickling solution varies depending on the temperature of the pickling solution and the sulfuric acid concentration. When the temperature is 55 ° C. and the sulfuric acid concentration is 5 to 10%, the solubility of ferrous sulfate reaches 30 to 25%. Thus, increasing the temperature and sulfuric acid concentration decreases the solubility of ferrous sulfate. When the sulfuric acid temperature is -5 ° C. and the sulfuric acid concentration is 15 to 20%, the solubility of ferrous sulfate is reduced to 5.1 to 3.8%. Utilizing these physical properties, cooling the waste acid causes most of the ferrous sulfate dissolved in the pickling solution to crystallize and separate, and the ferrous sulfate content in the waste solution By treating this waste liquid after drastically lowering the value, useful substances can be recovered and the purpose of environmental protection can be achieved.

  Therefore, developing a low-cost cooling device to increase the efficiency of the entire acid treatment is where the inventor seeks to improve the problem.

For this reason, the inventor made use of his many years of research and experience on cooling devices, worked on research and development, and as a result of studying in many ways, he devised the present invention.
An object of the present invention is to provide a waste acid cooling apparatus capable of improving the overall cooling processing efficiency.

  The waste acid cooling apparatus according to the present invention is connected to a first storage tank that stores a low-temperature fluid and a second storage tank that stores an acidic fluid. The waste acid cooling device includes a storage cylinder, a heat exchanger, a first pipe, and a second pipe. The storage cylinder is connected to the second storage tank and has a first temperature sensor and a volume flow meter. The heat exchanger is formed so that the cryogenic fluid and the acidic fluid flow in without contacting each other. One end of the first pipe is connected to the first storage tank, and the other end is attached to the heat exchanger, and guides the low-temperature fluid to the heat exchanger. One end of the second pipe is connected to the housing cylinder, is penetrated through the heat exchanger, and the other end is connected to the discharge port.

  With the above-described configuration, the initial volume and temperature of the acidic fluid can be accurately determined by the first temperature sensor and the volume flow meter. The second pipe is provided with a second temperature sensor at the other end connected to the containing cylinder, and can know the temperature difference when the acidic fluid is pulled down by the heat exchanger, and monitor and control the overall cooling efficiency. Can do.

  With the above-described configuration, when the temperature limit is set in the second temperature sensor, the second pipe is connected to the second reflux pipe connected to the containing cylinder, and the acidic fluid is returned to the reflux pipe when the temperature of the acidic fluid is higher than the limit temperature. The acidic fluid is circulated between the second pipe, the second reflux pipe, and the storage cylinder, and the recovered acidic fluid is maintained to be in a uniform low temperature state to ensure the quality of the recovery.

  The present invention is provided with three safety functions. The first safety function is that the first auxiliary pipe is connected between the first pipe and the first reflux pipe so that the cold fluid cannot enter the heat exchanger when an abnormality occurs in the heat exchanger. Is guided to the first auxiliary pipe. In the second safety function, an auxiliary port is provided between the heat exchanger and the storage cylinder in the flow path of the second pipe, and when the waste acid cooling device is abnormal, the second fluid is supplied to the acidic fluid. Use the fact that the second pipe is connected to the second auxiliary pipe by introducing the gas or liquid through the auxiliary port, and after cleaning or repairing the second pipe, It is discharging from the second auxiliary pipe. The third safety function is to provide a pressure release pipe connected to the second auxiliary pipe in the heat exchanger, and to remove the pressure of the high-pressure gas formed inside the heat exchanger. The accident rate can be reduced by the safety function described above.

It is a cooling process flowchart of the waste acid cooling device by one Embodiment of this invention. It is a piping diagram showing a waste acid cooling device according to an embodiment of the present invention. It is a piping diagram showing a waste acid cooling device according to an embodiment of the present invention. It is a piping diagram showing a waste acid cooling device according to an embodiment of the present invention. It is a piping diagram showing a waste acid cooling device according to an embodiment of the present invention.

  In order to explain the present invention, embodiments will be described as follows. In the embodiment, each component is in proportion to the convenience of explanation, and is not drawn based on the proportion of actual components.

(One embodiment)
A waste acid cooling device according to an embodiment of the present invention is shown in FIGS. FIG. 1 is a block diagram of a cooling process flow according to the present embodiment, and FIG. 2 is a piping diagram of the cooling process flow according to the present embodiment. The waste acid cooling device of this embodiment is used for connection between the first storage tank 10 that stores the low-temperature fluid 11 and the second storage tank 20 that stores the acidic fluid 21.
The waste acid cooling device includes a storage cylinder 30, a heat exchanger 40, a first pipe 50, and a second pipe 60.

  The storage cylinder 30 has an inlet end 31 and an outlet end 32, the inlet end 31 is connected to the second storage tank 20, and a first temperature sensor 33 and a volume flow meter 34 are provided. In this embodiment, the volume flow meter 34 is a transparent scale scale attached to the wall surface. The volume of the acidic fluid 21 accommodated in the inside can be confirmed directly by the user's visual observation, and the first temperature sensor 33 is detected by an electric conduction method for the convenience of monitoring control by the user. The electric potential difference of temperature is replaced with an electronic signal and transmitted to the operation panel.

  The heat exchanger 40 is used for allowing the cryogenic fluid 11 and the acidic fluid 12 to flow in without contacting each other.

  The first pipe 50 has one end connected to the first storage tank 10, the other end connected to the first reflux pipe 51 connected to the first storage tank 10, and the flow path of the first pipe 50. The cryogenic fluid 11 is attached and flows into the heat exchanger 40. The low temperature fluid 11 circulates between the first storage tank 10, the first pipe 50, and the first reflux pipe 51 by the circulation method. A first auxiliary pipe 52 is connected between the first pipe 50 and the first reflux pipe 51.

  The second pipe 60 has one end connected to the outlet end 32 of the storage cylinder 30 and the other end connected to the discharge port 61, and is drilled in the first pipe 50 of the heat exchanger 40 in the flow path. The second auxiliary pipe 63 connected to the second reflux pipe 62 of the storage cylinder 30 is connected. Among them, the pressure release pipe 64 connected to the heat exchanger 40 is connected to the second auxiliary pipe 63. In the flow path, a second temperature sensor 60a and an auxiliary port 60b are provided between the heat exchanger 40 and the discharge port 61 and between the heat exchanger 40 and the storage cylinder 30, respectively. In this embodiment, the first storage tank 10 and the second storage tank 20 guide the low-temperature fluid 11 and the acidic fluid 21 to the first pipe 50 and the storage cylinder 30, respectively. Consists of.

  The storage cylinder 30, the first pipe 50, the first auxiliary pipe 52, the second pipe 60, and the entrance / exit of the second auxiliary pipe 63 can be remotely controlled by the user, and the low-temperature fluid 11 and the acidic fluid 21. Are provided with a plurality of solenoid valves 70 capable of supplying to each element. Among them, the attachment and connection method of the electromagnetic valve 70 supplied to the low temperature fluid 11 and the acidic fluid 21 is a conventional technique, and the description thereof is omitted here.

  The above is a description of the structure and shape of the present embodiment, and the principle and effects of the present embodiment will be described as follows.

  Please refer to FIG. The waste acid cooling device of the present embodiment guides the low temperature fluid 11 and the acidic fluid 21 to the first pipe 50 and the storage cylinder 30, respectively, by providing the first storage tank 10 and the second storage tank 20 in the motor, respectively. be able to. First, the electromagnetic valve 70 is controlled to cause the acidic fluid 21 to flow from the second storage tank 20 into the storage cylinder 30. The first temperature sensor 33 and the volumetric flow meter 34 are used to acquire the initial temperature and the charged volume of the acidic fluid 21, and then the pump 60c is used to heat-exchange the acidic fluid 21 stored in the storage cylinder 30. Into the vessel 40. Since the second pipe 60 is installed in the first pipe 50 and the low temperature fluid 11 flows between the first storage tank 10, the first pipe 50, and the first reflux pipe 51 by the circulation method, A uniform low temperature state is formed inside one pipe 50. When the acidic fluid 21 enters the second pipe 60, the acidic fluid 21 originally in the high temperature state is transferred to the low temperature fluid 11 in the first pipe 50 according to the first law of thermodynamics, and the temperature of the acidic fluid 21 decreases, The low temperature fluid 11 is continuously circulated to maintain a uniform low temperature environment, and the thermal equilibrium of the acidic fluid 21 is maintained at a specific temperature.

  In the present embodiment, the second temperature sensor 60a is used for setting a limit temperature. When the temperature of the acidic fluid 21 is higher than the set temperature, the acidic fluid 21 flows into the second reflux pipe 62, and the acidic fluid 21 flows into the second pipe 60, the second reflux pipe 62, the storage cylinder 30, and the like by a circulation method. Between each other. When the temperature of the acidic fluid 21 is lower than the set value, it directly flows out from the discharge port 61. Thereby, the acidic fluid 21 inside the discharge port 61 is maintained at a uniform low temperature, and the quality of recovery is ensured. Among them, the second temperature sensor 60a replaces the detected potential difference with an electronic signal and transmits it to the operation panel by the electrical conduction method, and can know the terminal temperature, and the initial value detected by the first temperature sensor 33 In addition, the overall cooling efficiency can be monitored and controlled by knowing the temperature difference that the acidic fluid 21 has been pulled down via the heat exchanger 40.

  Continuing to refer to FIGS. 3 is a piping diagram (part 1) of the safety function flow according to this embodiment, FIG. 4 is a piping diagram (part 2) of the safety function flow according to this embodiment, and FIG. 5 is a safety function according to this embodiment. It is the piping figure (the 3) of a flow. The waste acid cooling device of this embodiment has three safety functions. The first safety function is that when the first auxiliary pipe 52 is connected between the first pipe 50 and the first reflux pipe 51 and an abnormality occurs in the heat exchanger 40, the low temperature fluid 11 continues to be in the heat exchanger 40. In order to prevent further damage by flowing in, the solenoid valve 70 between the first auxiliary pipe 52 and the heat exchanger 40 is closed so that the cryogenic fluid 11 cannot enter the heat exchanger 40. The low temperature fluid 11 flows through the first auxiliary pipe 52 and then is returned to the first storage tank 10. The second safety function is to provide an auxiliary port 60b between the heat exchanger 40 and the accommodating cylinder 30 in the flow path of the second pipe 60, and when the abnormality occurs in the heat exchanger 40, the acidic fluid 21 is 2 stays in the pipe 60, and in combination with the opening / closing operation of the electromagnetic valve 70, the acidic fluid 21 is guided from the second pipe 60 to the second auxiliary pipe 63, and the acidic fluid 21 is guided to the auxiliary port 60b by gas. The acidic fluid 21 is discharged through the second auxiliary pipe 63 by the air pressure, and the remaining waste acid is mixed with water or other cleaning liquid and discharged together. The third safety function is to provide a pressure release pipe 64 connected to the second auxiliary pipe in the heat exchanger 40, and the first pipe 50 performs the temperature lowering process using the low temperature fluid 11 inside the second pipe 60. Therefore, when the internal pressure suddenly rises due to the vaporization reaction when the acidic fluid 21 leaks to the outside and contacts the low temperature fluid 11 due to the damage of the first pipe 50, the first pressure release pipe 64 causes the first pipe 50 to break. This is to eliminate the high pressure inside the pipe 50 and prevent the occurrence of air blasting. The accident rate can be reduced by the safety function described above.

  As described above, the waste acid cooling apparatus according to the present embodiment accurately measures the initial temperature and the end temperature of the acidic fluid 21 by using the first temperature sensor 33 and the second temperature sensor 60a, so that the user can The temperature at which the acidic fluid 21 is lowered by the heat exchanger 40 is notified, and the temperature state of the entire cooling device can be immediately grasped. Among them, the temperature limit is set in the second temperature sensor 60a, and when the temperature of the acidic fluid 21 is higher than the limit temperature, the acidic fluid 21 is guided again to the second reflux pipe 62, and the circulation is performed once again to control the temperature. The quality of the recovery is ensured by keeping the acidic fluid 21 in a relatively uniform low temperature state so as to lower. Furthermore, the safety of the operator can be improved by providing three safety functions.

  Although the present invention describes and discloses one preferred embodiment, various forms can be devised by those skilled in the art based on the spirit and scope of the present invention. The embodiment described above is intended to explain the present invention, and does not limit the scope of the claims of the present invention. Various modifications or changes based on the spirit of the present invention are included in the claims of the present invention.

10 first containment tank,
11 cryogenic fluid,
20 second containment tank,
21 Acidic fluid,
30 containing cylinder,
31 Entrance end,
32 Exit end,
33 first temperature sensor,
34 Volumetric flow meter,
40 heat exchanger,
50 First piping,
51 1st reflux pipe,
52 first auxiliary pipe,
60 second piping,
60a second temperature sensor,
60b Auxiliary port,
60c pump,
61 outlet,
62 second reflux tube,
63 second auxiliary pipe,
64 pressure release pipe,
70 Solenoid valve.

Claims (8)

A waste acid cooling device used for connection between a first storage tank that stores a low-temperature fluid and a second storage tank that stores an acidic fluid,
A storage cylinder connected to the second storage tank and having a first temperature sensor and a volume flow meter;
A heat exchanger formed such that the cryogenic fluid and the acidic fluid flow in without contacting each other;
One end is connected to the first storage tank, the other end is attached to the heat exchanger, a first pipe for guiding the low temperature fluid to the heat exchanger,
A waste acid cooling apparatus comprising: a second pipe having one end connected to the housing cylinder, penetrating the heat exchanger, and the other end connected to a discharge port. A first return pipe that communicates a portion of the first pipe attached to the heat exchanger and the first storage tank;
2. The waste acid cooling apparatus according to claim 1, wherein the low-temperature fluid circulates between the first storage tank, the first pipe, and the first reflux pipe. A first auxiliary pipe provided between the first pipe and the first reflux pipe;
3. The waste acid cooling apparatus according to claim 2, wherein, when an abnormality occurs in the heat exchanger, the low-temperature fluid flows into the first auxiliary pipe without entering the heat exchanger. 4.   2. The waste acid cooling apparatus according to claim 1, wherein a second temperature sensor used for setting a limit temperature is provided between the discharge port and the heat exchanger in the flow path of the second pipe. . The second return pipe that communicates the second pipe and the storage cylinder;
When the acidic fluid is higher than the limit temperature, the acidic fluid is caused to flow into the second reflux pipe, and the acidic fluid circulates between the second pipe, the second reflux pipe, and the storage cylinder. The waste acid cooling apparatus according to claim 4, wherein:   In the flow path of the second pipe, a gas or liquid introduction auxiliary port used for cleaning or repairing the second pipe is formed between the heat exchanger and the storage cylinder. The waste acid cooling apparatus according to claim 1. A second auxiliary pipe connected to the second pipe;
The waste acid cooling apparatus according to claim 6, wherein the gas or liquid used for cleaning or maintenance is discharged from the second pipe by the second auxiliary pipe. The heat exchanger further includes a pressure release pipe connected to the second auxiliary pipe,
The waste acid cooling apparatus according to claim 7, wherein the high pressure gas formed inside the heat exchanger is pressure-removed.

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