PH value adjusting device for hot water tank of hydrogen chloride synthetic furnace

Abstract

The utility model discloses a pH value adjusting device for a hot water tank of a hydrogen chloride synthesis furnace. The pH value adjusting device comprises a preparation tank, a delivery pump and the hot water tank which are sequentially arranged, a liquid level meter is arranged on any side of the preparation tank, a water replenishing pipeline is arranged at the top of the preparation tank, an automatic water replenishing valve is arranged on the water replenishing pipeline, and the automatic water replenishing valve is electrically interlocked with the liquid level meter; a liquid inlet of the delivery pump is communicated with a water outlet pipeline at the bottom of the preparation tank; a liquid inlet pipeline is arranged at the top of the hot water tank, the liquid inlet pipeline is communicated with a liquid outlet pipe of the conveying pump, and a conveying valve is arranged on the liquid inlet pipeline; a pH meter is arranged on any side of the hot water tank and electrically interlocked with the conveying pump. By adopting the device disclosed by the utility model, the pH value of the pure water in the hot water tank can be adjusted at the first time after being reduced, and the accuracy of the concentration of the prepared liquid can be improved through interlocking of the water replenishing valve and the liquid level meter, so that the pH value of the pure water in the hot water tank is controlled to be within the safety range of equipment operation.

Description

Technical Field

[0001] The utility model belongs to the field of hydrogen chloride synthesis equipment, in particular to a pH value regulating device for a hot water tank of a hydrogen chloride synthesis furnace. Background Art

[0002] In the hydrogen chloride synthesis process of an ion-exchange membrane caustic soda system, pure water used to remove heat from the combustion section of the hydrogen chloride synthesis furnace is circulated in a hot water tank. As the circulation time increases, the pH of the pure water in the hot water tank slowly decreases. When the pH drops below 7, the pure water in the hot water tank can cause severe corrosion to the superheated water pipes and flash tank associated with the synthesis furnace, affecting the long-term stable operation of the equipment. The current pH testing method involves sampling and sending it to a testing center for testing. When the pH drops below 7, on-site personnel must manually prepare a trisodium phosphate solution. After preparation, the solution is transferred to a manhole above the hot water tank and then added to the hot water tank. This operation method, firstly, cannot promptly detect when the pH of the pure water in the hot water tank drops below 7. Secondly, the preparation and transfer of the trisodium phosphate solution is labor-intensive and dangerous. Therefore, a device that automatically adjusts the pH after the addition of the trisodium phosphate solution is needed to maintain the pH of the pure water in the hot water tank within the required range for the equipment and process. Utility Model Content

[0003] The utility model aims to provide a device for adjusting the pH value of a hot water tank, so as to solve the technical problem that the continuous decrease in the pH value of pure water in the hot water tank will cause internal corrosion of the hydrogen chloride synthesis furnace, thereby affecting the stable operation of the equipment.

[0004] To achieve its purpose, the utility model adopts the following technical solutions:

[0005] A pH value regulating device for a hot water tank of a hydrogen chloride synthesis furnace, comprising a preparation tank, a delivery pump and a hot water tank arranged in sequence;

[0006] A liquid level gauge is provided on either side of the preparation tank, a water supply pipe is provided on the top of the preparation tank, an automatic water supply valve is provided on the water supply pipe, and the automatic water supply valve is electrically interlocked with the liquid level gauge;

[0007] The liquid inlet of the delivery pump is connected to the water outlet pipe at the bottom of the preparation tank;

[0008] A liquid inlet pipe is provided on the top of the hot water tank, which is connected to the liquid outlet pipe of the delivery pump and has a delivery valve. A pH meter is provided on either side of the hot water tank, which is electrically interlocked with the delivery pump.

[0009] As a further improvement of the technical solution of the present invention, a reflux pipe is further provided on the top of the preparation tank, a reflux valve is provided on the reflux pipe, and the reflux pipe is connected to the liquid outlet pipe of the delivery pump.

[0010] Furthermore, the pH meter is also electrically interlocked with an audible and visual alarm.

[0011] Furthermore, the liquid level meter is an electronic liquid level meter.

[0012] By adopting the above technical solution, the beneficial effects of the utility model are:

[0013] Compared with the traditional operation mode, the pH adjustment device of the utility model can not only adjust the pH value of the pure water in the hot water tank immediately after it drops, but also improve the accuracy of the prepared liquid concentration by interlocking the water supply valve and the liquid level meter, thereby controlling the pH value of the pure water in the hot water tank within the safe range of equipment operation; specifically:

[0014] (1) The solution for adjusting the pH value of the hot water tank of the utility model is prepared in advance. When the pH value of the hot water tank is lower than the control requirement, the pH value can be adjusted quickly to reduce the corrosion of the superheated water pipes and flash tanks in the synthesis furnace system;

[0015] (2) The liquid level meter of the preparation tank can accurately control the pure water required to dissolve the material, which is more conducive to controlling the pH adjustment range;

[0016] (3) The lower limit of the pH value of the hot water tank is interlocked with the start-up of the delivery pump, and an audible and visual alarm is also provided to remind the staff to observe while adding the prepared liquid to the hot water tank as soon as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Reference numerals: 1-automatic water supply valve, 2-electronic liquid level gauge, 3-preparation tank, 4-delivery pump, 5-hot water tank, 6-pH meter, 7-delivery valve, 8-reflux valve. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0020] like Figure 1As shown, the present invention provides a pH adjustment device for a hot water tank in a hydrogen chloride synthesis furnace, comprising a preparation tank 3, a delivery pump 4, and a hot water tank 5, arranged in sequence. Liquid level gauges 2 (high and low) are installed on either side of the preparation tank 3. A water supply pipe is installed at the top of the preparation tank 3, equipped with an automatic water supply valve 1, which is electrically interlocked with the electronic liquid level gauge 2. A reflux pipe is also installed at the top of the preparation tank 3, equipped with a reflux valve 8, and connected to the liquid outlet pipe of the delivery pump 4. The liquid inlet of the delivery pump 4 is connected to the water outlet pipe at the bottom of the preparation tank 3. A liquid inlet pipe is installed at the top of the hot water tank 5, connected to the liquid outlet pipe of the delivery pump 4, and equipped with a delivery valve 7. A pH meter 6 is installed on either side of the hot water tank 5, which is electrically interlocked with the delivery pump 4 and an audible and visual alarm.

[0021] The electronic level gauge 2 is purchased from Azbil, model number is GTX35R-BAAH2EAAA3-

[0022] The sound and light alarm uses the alarm function in the DCS system, which is produced by Zhejiang Zheda Zhongkong Information Technology Co., Ltd. and is model ECS700.

[0023] When the device of the utility model is used, the trisodium phosphate required to be added to the hot water tank 5 to adjust the pH value is added to the preparation tank 3 in advance and mixed evenly. After the pH value of the hot water tank 5 drops below 7, the preparation liquid can be added to the hot water tank 5 to adjust the pH value as soon as possible.

[0024] When preparing the solution, start preparing immediately after the last prepared liquid is added to the hot water tank 5. First, use the interlocking function between the liquid level of the preparation tank 3 and the water replenishment valve 1 to replenish water. After replenishing water, add the materials to be prepared, then open the reflux valve 8, close the delivery valve 7, start the delivery pump 4, fully dissolve and mix the materials in the preparation tank 3, then close the delivery pump 4, open the delivery valve 7, and close the reflux valve 8.

[0025] When the pH value of the pure water in hot water tank 5 falls below 7, delivery pump 4, interlocked with pH meter 6, starts, triggering the audible and visual alarm (if sedimentation occurs during standing, close delivery valve 7 and open reflux valve 8 for internal circulation). The prepared liquid is then delivered to hot water tank 5 via delivery pump 4 for pH adjustment. Delivery pump 4 is interlocked with the lower limit (10%) of the liquid level in preparation tank 3. When the liquid level in preparation tank 3 drops to this lower limit (10%), delivery pump 4 is remotely stopped, and preparation tank 3 continues to replenish water via the liquid level interlock.

[0026] The above description is only a preferred embodiment of the present invention, but the implementation of the present invention is not limited thereto. It should be noted that, for those skilled in the art, based on the technical inspiration provided by the present invention, other equivalent variations and improvements can be made, all of which can achieve the purpose of the present invention and should be considered as within the scope of protection of the present invention.

Claims

1. A pH value regulating device for a hot water tank of a hydrogen chloride synthesis furnace, characterized in that: It comprises a preparation tank (3), a delivery pump (4) and a hot water tank (5) which are arranged in sequence; A liquid level gauge (2) is provided on either side of the preparation tank (3), a water supply pipe is provided on the top of the preparation tank (3), an automatic water supply valve (1) is provided on the water supply pipe, and the automatic water supply valve (1) is electrically interlocked with the liquid level gauge (2); The liquid inlet of the delivery pump (4) is connected to the water outlet pipe at the bottom of the preparation tank (3); A liquid inlet pipe is provided on the top of the hot water tank (5), the liquid inlet pipe is connected to the liquid outlet pipe of the delivery pump (4), and a delivery valve (7) is provided on the liquid inlet pipe; a pH meter (6) is provided on either side of the hot water tank (5), and the pH meter (6) is electrically interlocked with the delivery pump (4).

2. The pH value regulating device for a hot water tank of a hydrogen chloride synthesis furnace according to claim 1, characterized in that: A reflux pipe is also provided on the top of the preparation tank (3), a reflux valve (8) is provided on the reflux pipe, and the reflux pipe is connected to the liquid outlet pipe of the delivery pump (4).

3. A pH value regulating device for a hot water tank of a hydrogen chloride synthesis furnace according to claim 1 or 2, characterized in that: The pH meter (6) is also electrically interlocked with the sound and light alarm.

4. A pH value regulating device for a hot water tank of a hydrogen chloride synthesis furnace according to claim 1 or 2, characterized in that: The liquid level meter (2) is an electronic liquid level meter.

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