System for producing calcium liquid by recycling hydrochloric acid

Abstract

The utility model relates to the field of chemical engineering devices, and provides a system for producing calcium liquid by recycling hydrochloric acid, which comprises a reaction tank, the reaction tank is provided with a feed pipe for inputting hydrochloric acid and a feeding device for feeding calcium carbonate, and the reaction tank is provided with an outlet pipeline for discharging calcium liquid and communicated with a calcium liquid neutralization tank. And the outlet pipeline is provided with a self-absorption tank for siphoning calcium liquid. The device has the beneficial effects that the problem that the existing device cannot recycle hydrochloric acid to manufacture calcium liquid is solved, the calcium liquid is reacted with calcium carbonate to generate calcium mud, the calcium mud can be used as a heat insulation material of other products, profit is brought to enterprises, hydrochloric acid is used as an additional product, a large amount of cost is saved for the enterprises by storing hydrochloric acid, and the production cost is reduced. According to the utility model, a large amount of hydrochloric acid is consumed, the operation burden of an enterprise is reduced, and the practical value is extremely high.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a system for recycling hydrochloric acid to produce calcium liquid. Background Art

[0002] Hydrochloric acid is a common byproduct of many industrial processes. This is because hydrochloric acid is a strong acid that can act as a catalyst or reaction medium in many chemical reactions. However, despite its wide application in industrial production, its storage and handling are a big problem. Hydrochloric acid is highly corrosive, which means it can damage many materials, including some common metals and plastics. Therefore, storing hydrochloric acid requires special equipment and procedures, which are usually made of corrosion-resistant materials, which are often expensive. In addition, the storage and handling of hydrochloric acid also need to comply with strict safety regulations to prevent hydrochloric acid from leaking or splashing, causing personal injury or environmental pollution. These factors have placed a lot of financial burden on companies.

[0003] In addition, the volatilization of hydrochloric acid can cause air pollution, posing a threat to the environment and human health. Hydrochloric acid is a strong acid, and its volatiles can react with water molecules in the air to generate acid mist. This acid mist can not only corrode buildings and other structures, but also cause damage to the human respiratory system, especially for people with respiratory diseases, the impact of acid mist may be more serious. In addition, acid mist can also reduce the quality of the air and cause environmental problems such as haze. Therefore, controlling the volatilization and emission of hydrochloric acid is an important part of environmental protection work.

[0004] Therefore, it is very necessary to develop a system that can recycle hydrochloric acid to produce calcium solution. Such a system can convert hydrochloric acid into valuable products, thereby achieving effective utilization of resources, reducing environmental pollution, and reducing the operating costs of enterprises. Utility Model Content

[0005] Aiming at the shortcomings of the prior art, the problem that hydrochloric acid cannot be recycled to produce calcium solution is solved.

[0006] The utility model provides a system for recycling hydrochloric acid to produce calcium liquid, comprising a reaction pool, wherein the reaction pool is provided with a feeding pipe for inputting hydrochloric acid and a feeding device for inputting calcium carbonate, the reaction pool is provided with an outlet pipe for discharging the calcium liquid and connected to a calcium liquid neutralization tank, and the outlet pipe is provided with a self-priming tank for siphoning the calcium liquid.

[0007] Furthermore, the feed pipe is provided with a hydrochloric acid heat exchanger, and the tube side of the hydrochloric acid heat exchanger passes through the hydrochloric acid shell layer and cooling water.

[0008] As a preferred embodiment, the feeding device is a fixed belt conveyor with an inclination angle of about 28° to 32°.

[0009] Furthermore, a hydrochloric acid storage tank is arranged between the heat exchanger and the reaction tank, and a nitrogen protection device and a single call valve are set up on the top of the hydrochloric acid storage tank.

[0010] Furthermore, an outlet pipe is arranged on the top of the reaction pool to be connected to an absorption tower for absorbing gasified hydrogen chloride, and a reflux pipe is arranged at the bottom of the absorption tower to be connected to the reaction pool.

[0011] As a preferred solution, the number of the absorption towers is 2 and they are connected in series, the absorption tower that the gasified hydrogen chloride first enters is the rich liquid tower, and the absorption tower that it enters later is the lean liquid tower.

[0012] As a preferred solution, a frame-type agitator is arranged inside the calcium solution neutralization tank, and the stirring tangential speed of the frame-type agitator is 3 m / s.

[0013] As a preferred solution, the air outlet pipe is provided with a centrifugal fan, and the blade shape of the centrifugal fan is a backward curved blade.

[0014] The beneficial effects of the utility model are:

[0015] The problem that the existing devices cannot recycle hydrochloric acid to make calcium liquid is solved. The calcium liquid produced by reaction with calcium carbonate and then calcium mud can be used as insulation material for other products, bringing profits to the enterprise. In addition, hydrochloric acid is a by-product, and the storage of hydrochloric acid saves a lot of expenses for the enterprise. The utility model consumes a large amount of hydrochloric acid, reduces the operating burden of the enterprise, and has extremely high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.

[0017] Figure 1 A schematic structural diagram of the utility model.

[0018] The reference numerals in the accompanying drawings are:

[0019] 1. Reaction tank; 11. Feed pipe; 12. Feeding device; 2. Self-priming tank; 3. Heat exchanger; 4. Hydrochloric acid storage tank; 5. Absorption tower; 6. Calcium liquid neutralization tank; 7. Centrifugal fan. DETAILED DESCRIPTION

[0020] To illustrate the features of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0021] Example:

[0022] See also Figure 1This embodiment provides a system for recycling hydrochloric acid to produce calcium liquid, including a reaction tank 1, the reaction tank 1 is provided with a feed pipe 11 for inputting hydrochloric acid and a feeding device 12 for inputting calcium carbonate, the reaction tank 1 is provided with an outlet pipe for discharging calcium liquid connected to a calcium liquid neutralization tank 6, and the outlet pipe is provided with a self-priming tank 2 for siphoning calcium liquid. The calcium liquid produced by the reaction of hydrochloric acid and calcium carbonate, and then calcium mud, can be used as a heat insulation material for other products, bringing profits to the enterprise, and hydrochloric acid as a by-product, the storage of hydrochloric acid saves a lot of expenses for the enterprise, the utility model consumes a lot of hydrochloric acid, reduces the operating burden of the enterprise, and has extremely high practical value.

[0023] The feed pipe 11 is provided with a hydrochloric acid heat exchanger 3, which is made of graphite. Since the material is highly corrosive, the tube path of the hydrochloric acid heat exchanger 3 runs through the hydrochloric acid shell and cooling water.

[0024] The feeding device 12 is a fixed belt conveyor with an inclination angle of about 30°. The calcium carbonate-rich material is slowly transported to the reaction tank through the conveyor to directly react with hydrochloric acid. In this embodiment, baffles of different heights are provided on the top of the belt conveyor to ensure that the material can be evenly fed at the upper part of the reaction tank, ensuring full contact with hydrochloric acid and uniform reaction.

[0025] A hydrochloric acid storage tank 4 is arranged between the heat exchanger 3 and the reaction tank 1. A nitrogen protection device and a single call valve are arranged on the top of the hydrochloric acid storage tank 4. This arrangement ensures that the operating pressure on the tank top does not exceed 88Kpa to prevent accidents caused by overpressure in the storage tank in the later stage. Alkali solution spraying facilities are distributed around the storage tank to further ensure the safety of the storage tank.

[0026] An air outlet pipe is arranged at the top of the reaction pool 1 to be connected to an absorption tower 5 for absorbing gasified hydrogen chloride, and a reflux pipe is arranged at the bottom of the absorption tower 5 to be connected to the reaction pool 1. The absorption tower 5 is composed of two towers connected in series. The tower that the gasified hydrogen chloride first enters is a rich liquid tower, and the tower that it enters later is a lean liquid tower. In this embodiment, the absorbent is desalted water. In order to prevent material contamination, a steel skeleton PPE pipe is selected for the desalted water pipeline, wherein the air concentration discharged from the top of the tower is lower than 0.1%. The hydrochloric acid absorption tower is connected in the middle by a connecting pipe, and the absorption liquid flows into the reaction pool through the pipeline at the bottom of the tower.

[0027] Since the calcium liquid material produced by this device is a high-viscosity non-Newtonian fluid, this embodiment sets a frame agitator inside the calcium liquid neutralization tank 6, and the stirring tangential speed of the frame agitator is 3m / s. In addition, in order to prevent dead zones from being generated inside the equipment, baffles are set inside the equipment, and 4 baffles are symmetrically set.

[0028] In order to improve the absorption efficiency of the volatilized hydrogen chloride gas, a centrifugal fan 7 is arranged in the outlet pipe. Since hydrochloric acid is a volatile gas and the flow rate of hydrogen chloride gas is large, in order to meet the requirements of large conveying volume and high pressure, the blade shape of the centrifugal fan 7 is a backward curved blade.

[0029] The above embodiments and drawings are only used to illustrate the technical solution of the utility model, and are not intended to limit the utility model. The utility model is described in detail with reference to the preferred embodiments. It should be understood by ordinary technicians in this field that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the utility model do not deviate from the purpose of the utility model and should also fall within the scope of protection of the claims of the utility model. Other related technical structures not fully disclosed in the utility model are prior art in the field.

Claims

1. A system for recycling hydrochloric acid to produce calcium solution, characterized in that: The invention comprises a reaction pool (1), wherein the reaction pool (1) is provided with a feed pipe (11) for inputting hydrochloric acid and a feeding device (12) for inputting calcium carbonate, wherein the reaction pool (1) is provided with an outlet pipe for discharging calcium liquid and connected to a calcium liquid neutralization tank (6), and wherein the outlet pipe is provided with a self-priming tank (2) for siphoning calcium liquid.

2. A system for recycling hydrochloric acid to produce calcium solution according to claim 1, characterized in that: The feed pipe (11) is provided with a heat exchanger (3) for cooling the hydrochloric acid, and the tube path of the heat exchanger (3) passes through the hydrochloric acid shell and the cooling water.

3. A system for recycling hydrochloric acid to produce calcium solution according to claim 1, characterized in that: The feeding device (12) is a fixed belt conveyor with an inclination angle of 28° to 32°.

4. A system for recycling hydrochloric acid to produce calcium solution according to claim 2, characterized in that: A hydrochloric acid storage tank (4) is arranged between the heat exchanger (3) and the reaction tank (1), and a nitrogen protection device and a single call valve are arranged on the top of the hydrochloric acid storage tank (4).

5. A system for recycling hydrochloric acid to produce calcium solution according to claim 1, characterized in that: An outlet pipe is arranged at the top of the reaction pool (1) and is connected to an absorption tower (5) for absorbing gasified hydrogen chloride. A reflux pipe is arranged at the bottom of the absorption tower (5) and is connected to the reaction pool (1).

6. A system for recycling hydrochloric acid to produce calcium solution according to claim 5, characterized in that: The number of the absorption towers (5) is 2 and they are connected in series. The absorption tower that the gasified hydrogen chloride first enters is the rich liquid tower, and the absorption tower that it enters later is the lean liquid tower.

7. A system for recycling hydrochloric acid to produce calcium solution according to claim 1, characterized in that: A frame-type agitator is arranged inside the calcium solution neutralization tank (6), and the stirring tangential speed of the frame-type agitator is 3 m / s.

8. A system for recycling hydrochloric acid to produce calcium solution according to claim 5, characterized in that: The air outlet pipe is provided with a centrifugal fan (7), and the blade shape of the centrifugal fan (7) is a backward curved blade.

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