Efficient dechlorination device

Abstract

The utility model relates to an efficient dechlorination device which comprises a dissolving tank, the dissolving tank is respectively communicated with a first-stage circulating pump and a first-stage preheater through delivery pumps, a discharge port of the first-stage preheater is communicated with a first-stage reactor through a pipeline, the bottom of the first-stage reactor is respectively communicated with the first-stage circulating pump and a second-stage preheater through pipelines, and the second-stage preheater is communicated with a second-stage reactor through pipelines. A top discharge port of the second-stage preheater is communicated with the second-stage reactor through a pipeline, top discharge ports of the first-stage reactor and the second-stage reactor are respectively communicated with the tail gas washing tower through pipelines, and the dissolving tank is provided with a KCL feed port and a phosphoric acid feed port. By changing the pore plate with a special structure, materials can fully react, the inside of the device is made of a lining polytetrafluoroethylene material, the corrosion resistance of the device is improved, the service time is longer under the conditions of high temperature and negative pressure, the maintenance time is reduced, dry air is introduced into the tower top and is heated by utilizing waste heat generated by reaction, part of steam is saved, and the production cost is reduced. And the cost investment is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, and in particular to a high-efficiency dechlorination device. Background Technology

[0002] The dechlorination devices currently used in production systems have two main drawbacks: firstly, some of the heat generated by the reaction cannot be effectively utilized; secondly, the outlet surface for hydrogen chloride gas is small, resulting in a large amount of residual chloride ions, which is highly corrosive to the entire production system and has a short service life. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a high-efficiency dechlorination device. By improving the structure of the reaction tank and the feed orifice plate, the problems of poor reaction effect and easy scaling are solved, so as to achieve long-term stable operation.

[0004] The technical solution of this utility model is as follows:

[0005] A high-efficiency dechlorination device includes a reaction dissolution tank, which is connected to a primary circulation pump and a primary preheater via a transfer pump. The outlet of the primary preheater is connected to a primary reactor via a pipeline. The bottom of the primary reactor is connected to a primary circulation pump and a secondary preheater via pipelines. The top outlet of the secondary preheater is connected to a secondary reactor via a pipeline. The top outlets of the primary and secondary reactors are connected to a tail gas scrubbing tower via pipelines. The reaction dissolution tank is equipped with KCl and phosphoric acid inlets.

[0006] Preferably, the bottom of the secondary preheater is connected to the bottom of the secondary reactor via a secondary circulation pump.

[0007] Preferably, the secondary reactor is connected to the flash tank via a pipeline.

[0008] Preferably, a dry air input pipe is provided at the top of the reaction dissolution tank. The dry air temperature is 180°C.

[0009] Preferably, the reaction dissolution tank, the transfer pump, the primary reactor, and the secondary reactor are lined with PTFE.

[0010] Preferably, the KCL reaction dissolution tank and the phosphoric acid feed inlet adopt a special structure of orifice plate. The orifice plate is an orifice plate with a guide pipe. The top of the orifice plate is provided with a guide pipe and has openings to form a swirling gas. The side of the orifice plate is opened to expand the feed area of ​​the orifice plate, so as to ensure more uniform feed distribution and more complete reaction, and can effectively prevent hydrogen chloride from directly corroding the reactor inlet.

[0011] To solve the above-mentioned technical problems, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model uses PTFE lining for all material contact parts to ensure normal operation of the equipment under high temperature and negative pressure conditions, improve the equipment's corrosion resistance, and provide strong support for long-term stable production.

[0013] 2. By using a specially structured perforated plate ( Figure 2 The orifice plate is a guide tube with a guide tube at the top to form a swirling gas flow. The side of the orifice plate is also perforated to increase the feed area, allowing the material to react fully. The internal material of the device is now lined with PTFE, which increases the device's corrosion resistance and extends its service life under high temperature and negative pressure conditions, reducing maintenance time.

[0014] 3. The reaction dissolution tank has a dry air input pipe at the top, which uses the waste heat generated by the reaction to heat the dry air, saving some steam and effectively reducing cost. Using heated air for stripping can significantly reduce chloride ions. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the KCL reaction dissolution tank and the phosphoric acid feed inlet.

[0018] The components are: 1. Reaction dissolution tank, 2. Transfer pump, 3. Primary reactor, 4. Primary circulation pump, 5. Primary preheater, 6. Secondary reactor, 7. Secondary circulation pump, 8. Secondary preheater, 9. Flash tank, 10. Tail gas scrubbing tower. Detailed Implementation

[0019] like Figure 1 As shown, a high-efficiency dechlorination device includes a reaction dissolution tank 1. The reaction dissolution tank 1 is connected to a primary circulation pump 4 and a primary preheater 5 via a transfer pump 2. The discharge port of the primary preheater is connected to a primary reactor 3 via a pipeline. The bottom of the primary reactor 3 is connected to the primary circulation pump 4 and a secondary preheater 8 via pipelines. The top discharge port of the secondary preheater 8 is connected to a secondary reactor 6 via a pipeline. The top discharge ports of the primary reactor 3 and the secondary reactor 6 are connected to a tail gas scrubbing tower 10 via pipelines. The reaction dissolution tank 1 is equipped with KCl and phosphoric acid inlets.

[0020] Preferably, the bottom of the secondary preheater 8 is connected to the bottom of the secondary reactor 6 via a secondary circulation pump 7.

[0021] Preferably, the secondary reactor 6 is connected to the flash tank 9 via a pipe.

[0022] Preferably, a dry air input pipe is provided at the top of the reaction dissolution tank 1. In a highly efficient dechlorination device, KCl and phosphoric acid enter the reaction dissolution tank 1. The bottom of the reaction dissolution tank 1 is fed to the outlet of a circulating pump 4 via a transfer pump 2. The outlet of the primary circulating pump 4 is connected to a primary preheater 5, which heats the material to 130°C before sending it to the primary reactor 3 for reaction.

[0023] The outlet of the secondary circulation pump 7 is connected to the secondary preheater 5, which heats the material to 180°C and sends it to the secondary reactor 6 for reaction.

[0024] The hydrogen chloride gas generated at the top of the primary reactor 3 and the secondary reactor 6 escapes to the tail gas scrubbing tower 10, and the circulating pump 7 is connected to a delivery pipeline to send the generated potassium dihydrogen phosphate into the flash tank 9.

[0025] Preferably, the inlet and outlet pipes of the transfer pump 2 are lined with PTFE, which is resistant to corrosion from high concentrations of hydrogen chloride.

[0026] Preferably, the inlet of the reaction dissolution tank 1 adopts a special structure orifice plate. The orifice plate is an orifice plate with a guide pipe. The top of the orifice plate is provided with a guide pipe and has openings to form a swirling gas. The side of the orifice plate has openings and the feed area of ​​the orifice plate is enlarged to ensure more uniform feed distribution and more complete reaction. It can effectively prevent hydrogen chloride from directly corroding the reactor inlet.

[0027] Preferably, the primary reactor 3 and the secondary reactor 6 are lined with PTFE, which can withstand high temperature and negative pressure, increase the corrosion resistance of the equipment, and prevent the high concentration of hydrogen chloride gas in the product from corroding the equipment.

[0028] The reaction dissolution tank KCL and the phosphoric acid inlet adopt a special perforated plate structure ( Figure 2 The orifice plate is a plate with a guide tube. The top of the orifice plate is equipped with a guide tube and has openings to form a swirling gas flow. The side of the orifice plate has openings and the feed area of ​​the orifice plate is enlarged to ensure more uniform feed distribution and more complete reaction. It can effectively prevent hydrogen chloride from directly corroding the reactor inlet.

[0029] This utility model ensures that the equipment is suitable for the production conditions of dechlorination of production materials by selecting the best materials. By adopting a special structure of the orifice plate (Figure 2), the top of the orifice plate is provided with a guide pipe and openings, which can form a swirling gas. The side of the orifice plate is opened and the feed area of ​​the orifice plate is expanded to make the material evenly distributed, ensuring that hydrogen chloride gas can be removed more effectively. All the materials in contact with the material are made of PTFE lined material, which ensures that the equipment can be used normally under high temperature and negative pressure conditions, improves the corrosion resistance of the equipment, extends the service life of the equipment, improves production efficiency, and provides strong experience and data for the selection of equipment for complex material conditions.

[0030] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A high-efficiency dechlorination device, comprising a reaction dissolution tank (1), characterized in that: The reaction dissolving tank (1) is connected to the primary circulation pump (4) and the primary preheater (5) respectively via the transfer pump (2). The discharge port of the primary preheater is connected to the primary reactor (3) via a pipeline. The bottom of the primary reactor (3) is connected to the primary circulation pump (4) and the secondary preheater (8) respectively via a pipeline. The top discharge port of the secondary preheater (8) is connected to the secondary reactor (6) via a pipeline. The top discharge ports of the primary reactor (3) and the secondary reactor (6) are connected to the tail gas scrubbing tower (10) via pipelines respectively. The reaction dissolving tank (1) is equipped with KCL and phosphoric acid feed ports.

2. The high-efficiency dechlorination device according to claim 1, characterized in that: The bottom of the secondary preheater (8) is connected to the bottom of the secondary reactor (6) via a secondary circulation pump (7).

3. The high-efficiency dechlorination device according to claim 1, characterized in that: The secondary reactor (6) is connected to the flash tank (9) via a pipeline.

4. The high-efficiency dechlorination device according to claim 1, characterized in that: The top of the reaction dissolution tank (1) is equipped with a dry air input pipe.

5. The high-efficiency dechlorination device according to claim 1, characterized in that: The reaction dissolution tank (1), the transfer pump (2), the primary reactor (3) and the secondary reactor (6) are lined with PTFE.

6. The high-efficiency dechlorination device according to claim 5, characterized in that: The reaction dissolution tank (1) has a perforated plate with a guide pipe for KCL and phosphoric acid feed inlet.

7. The high-efficiency dechlorination device according to claim 6, characterized in that: The perforated plate also has holes on its side.

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