Intelligent acid regeneration system capable of preventing crystallization blockage

Abstract

An intelligent acid regeneration system capable of preventing crystallization blockage, comprising a pre-concentrator (1) and a roasting furnace (5). A blowdown pipe provided with a blowdown valve (8) is connected to the lowest end of a roasting feeding line; a liquid inlet module is arranged between the roasting feeding line and spray guns (4) at the top of the roasting furnace (5), a desalted water inlet line is connected to the liquid inlet module, and a return line is arranged on a connecting line between a roasting furnace feeding pump (3) and the liquid inlet module. By arranging the roasting feeding line, a pre-concentration circulating line, the return line, the desalted water inlet line and the water inlet module, an operator can utilize a same acid regeneration production system to perform forward regeneration from waste acid and reverse desalted water cleaning, thereby effectively preventing crystallization blockage in the feeding line of the roasting furnace (5), in addition, the system line structure is simplified, the operation safety is improved, and intelligent automatic management and control of the system are better facilitated.

Description

An intelligent acid regeneration system to prevent crystallization blockage Technical Field

[0001] The utility model belongs to the technical field of acid regeneration, and in particular relates to an intelligent acid regeneration system that prevents crystallization and blockage. Background Art

[0002] The metallurgical industry, the chlor-alkali industry, and non-ferrous industries such as cobalt, nickel, titanium, and molybdenum usually use a mixture of hydrochloric acid, nitric acid, and hydrofluoric acid to pickle steel, generating a large amount of pickling waste liquid. In order to reduce the production costs of enterprises and reduce the harm of pickling waste liquid to the environment, the above-mentioned industries often use acid treatment technology to regenerate and recycle the pickling waste liquid to achieve the recycling of the acid liquid. The regeneration of pickling waste liquid generally requires an acid treatment system. The core part of the acid treatment system includes a chemical heat treatment unit with a roasting furnace as the core, and a flue gas cooling and concentration unit with a pre-concentrator as the core. By utilizing the waste heat of the high-temperature flue gas, the pickling waste liquid is efficiently concentrated, thereby reducing the gas consumption in the roasting furnace and the operating costs of the system.

[0003] In existing acid treatment systems, to maintain stable operation of concentrated acid in the preconcentrator and roaster, a large amount of manpower is often required to control the preconcentrator circulation pipeline and roaster feed pipeline to ensure that the concentrated acid pipeline is unobstructed during normal operation. In the event of an emergency shutdown, the manual drain valve is manually opened to reduce the concentrated acid from settling and crystallizing in the equipment and pipelines, thereby avoiding crystallization blockage in the equipment and pipelines that are used for concentrated acid, which may cause damage to the equipment and pipelines. The above-mentioned operation and control methods are not only cumbersome to operate in actual production due to the complex pipeline system, but also pose a great safety risk, especially in winter when the temperature is low. If handled improperly, it is easy to cause crystallization blockage in the equipment and pipelines, affecting the safe use of the equipment and pipelines, causing equipment and pipelines to burst or damage, acid splashing, and adversely affecting the personal safety of operators.

[0004] Therefore, there is an urgent need for an intelligent acid regeneration system that is simple to operate and has a simple system to prevent crystallization and blockage.

[0005] Utility Model Content

[0006] The purpose of the utility model is to address the deficiencies of the existing technology and provide an intelligent acid regeneration system that prevents crystallization and blockage. It aims to solve the problems existing in the existing acid regeneration system, such as the need to increase a large amount of manpower to control the pre-concentrator circulation pipeline and the roaster feed pipeline, the complex system pipelines, the cumbersome operation, and the greater safety risks.

[0007] In order to solve the above technical problems, the utility model provides an intelligent acid regeneration system for preventing crystallization and blockage, comprising a preconcentrator and a roaster, wherein the gas outlet of the roaster is connected to the top of the preconcentrator through a flue gas pipeline, the liquid outlet end of the preconcentrator is connected to the top of the preconcentrator through a preconcentration circulation pipeline, the liquid outlet end of the preconcentrator is connected to the top of the roaster through a roasting feed pipeline, a preconcentration circulation pump is provided on the preconcentration circulation pipeline, a roasting furnace feed pump is provided on the roasting feed pipeline, and the preconcentration circulation pipeline is connected to the top of the preconcentrator through a preconcentration circulation pipeline. The roasting feed pipeline shares a section of pipeline connected to the liquid outlet end of the pre-concentrator with the roasting feed pipeline. The roasting feed pipeline is also provided with a stacking valve. The lowest end of the roasting feed pipeline is connected to a sewage discharge pipeline with a sewage discharge valve. A liquid inlet module is provided between the roasting feed pipeline and the top spray gun of the roasting furnace. The desalted water inlet pipeline is connected to the liquid inlet module. A reflux pipeline is connected to the connecting pipeline between the roasting furnace feed pump and the liquid inlet module. The output end of the reflux pipeline is connected to the bottom of the pre-concentrator, and a reflux valve is provided on the reflux pipeline.

[0008] Optionally, the liquid inlet module includes a main feed pipe, a feed branch pipe and a water inlet branch pipe. The main feed pipe and the water inlet branch pipe are connected in parallel to the same end of the feed branch pipe, and the other end of the feed branch pipe is connected to the roasting feed pipeline. The main feed pipe is connected to the top spray gun of the roasting furnace, and the water inlet branch pipe is connected to the desalted water inlet pipeline.

[0009] Optionally, the main feed pipe is provided with a main feed liquid inlet valve, the branch feed pipe is provided with a branch feed liquid inlet valve, and the water inlet branch pipes are both provided with water inlet valves.

[0010] Optionally, the stacking valve, reflux valve, drain valve, main pipe liquid inlet valve, branch pipe liquid inlet valve and water inlet valve are all self-controlled valves.

[0011] Optionally, the pre-concentration circulation pipeline, the connecting pipeline of the stacking valve, the connecting pipeline of the reflux valve, the main feed pipe and the feed branch pipe are all provided with detectors for detecting the pressure or flow in the pipe.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model provides an intelligent acid regeneration system for preventing crystallization blockage. The system comprises a roasting feed pipeline, a pre-concentration circulation pipeline, a reflux pipeline, a desalted water inlet pipeline and a water inlet module. The reflux pipeline is connected in parallel with the pre-concentration circulation pipeline and shares a section of pipeline with the roasting furnace feed pump and the superposition valve with the roasting feed pipeline. The water inlet module is used to connect the roasting feed pipeline with the spray gun on the top of the roasting furnace, as well as the desalted water inlet pipeline and the roasting feed pipeline. The operator can use the same acid regeneration production system to perform forward acid waste liquid regeneration and reverse desalted water cleaning, thereby realizing acid regeneration function and pipeline cleaning function, effectively preventing crystallization blockage in the roasting furnace feed pipeline, and simplifying the system pipeline structure, reducing the difficulty of operation control, improving operation safety, and being more conducive to intelligent automatic control of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a schematic structural diagram of an intelligent acid regeneration system for preventing crystallization and blockage provided by an embodiment of the present invention;

[0015] Among them, 1. Pre-concentrator; 2. Pre-concentrator circulation pump; 3. Roasting furnace feed pump; 4. Spray gun; 5. Roasting furnace; 6. Superposition valve; 7. Reflux valve; 8. Drain valve; 9. Branch pipe liquid inlet valve; 10. Main pipe liquid inlet valve; 11. Water inlet valve. DETAILED DESCRIPTION

[0016] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0017] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0018] The present invention will be further described below with reference to specific embodiments, but this is not intended to limit the present invention.

[0019] The utility model provides an intelligent acid regeneration system for preventing crystallization and blockage, comprising a preconcentrator 1 and a roasting furnace 5, wherein the gas outlet of the roasting furnace 5 is connected to the top of the preconcentrator 1 through a flue gas pipeline, the liquid outlet end of the preconcentrator 1 is connected to the top spray gun 4 of the roasting furnace 5 through a roasting feed pipeline, a preconcentrator circulation pump 2 is provided on the preconcentration circulation pipeline, a roasting furnace feed pump 3 is provided on the roasting feed pipeline, and the preconcentrator circulation pipeline and the roasting feed pipeline share a section with the preconcentrator 1, the roasting feed pipeline is also provided with a stacking valve 6, the connecting pipeline between the roasting furnace feed pump 3 and the stacking valve 6 is connected to a sewage pipeline with a sewage valve 8, a liquid inlet module is provided between the roasting feed pipeline and the top spray gun 4 of the roasting furnace 5, the liquid inlet module is connected to the desalted water inlet pipeline, a reflux pipeline is provided on the connecting pipeline between the roasting furnace feed pump 3 and the liquid inlet module, the output end of the reflux pipeline is connected to the bottom of the pre-concentrator 1, and a reflux valve 7 is provided on the reflux pipeline.

[0020] As shown in FIG1 , the preconcentrator 1 and the roasting furnace 5 are connected via a roasting feed pipeline, and the bottom and top ends of the preconcentrator 1 are connected via a preconcentration circulation pipeline, dividing the overall pipeline of the acid regeneration system into a first pipeline, a second pipeline, and output pipelines for roasting feed, preconcentration circulation, and reflux. The first pipeline is connected to the output pipeline of reflux to form a preconcentration circulation pipeline, the first pipeline, the second pipeline, and the output pipeline of roasting feed are sequentially connected to form a roasting feed pipeline, and the first pipeline, the second pipeline, and the output pipeline of reflux are sequentially connected to form a reflux pipeline, that is, the roasting feed pipeline and the preconcentration circulation pipeline share the first pipeline, and the roasting feed pipeline and the reflux pipeline share the first pipeline. and the second pipeline, using the roaster feed pump 3 as the power pump for roasting feed and pickling liquid reflux, controlling the opening and closing of the roasting feed pipeline by operating the superposition valve 6, controlling the opening and closing of the reflux pipeline by operating the reflux valve 7, utilizing the liquid inlet module to feed acid into the spray gun 4 of the roaster 5 in the production mode, and feeding desalted water into the roasting feed pipeline in the cleaning mode, enabling the operator to use the same acid regeneration production system for forward acid waste liquid regeneration and reverse desalted water cleaning, realizing the acid regeneration function and pipeline cleaning function, effectively preventing crystallization blockage in the feed pipeline of the roaster 5, simplifying the system pipeline structure, reducing the difficulty of operation control, and being more conducive to intelligent automatic control of the system.

[0021] The setting of the reflux pipeline not only maintains the stable operation of the pipeline during the production and feeding process of the acid regeneration system, but also cooperates with the drain valve 8 to discharge the residual acid waste liquid in the pipeline, promptly responds to the pipeline emptying during emergency shutdown, and serves as a drainage branch pipe when the desalted water is reversely fed for cleaning, draining water into the pre-concentrator 1 to maintain the stable operation of the pipeline. While improving the safety of system operation, there is no need to add multiple branches to stabilize the pipe pressure, which is conducive to simplifying the system pipeline structure.

[0022] Among them, the pretreatment circulation pump 2 is arranged on the output pipeline of the pre-concentration circulation, the reflux valve 7 is arranged on the reflux output pipeline, and the roasting furnace feed pump 3 is arranged on the second pipeline.

[0023] As a specific implementation of the liquid inlet module structure, the liquid inlet module includes a feed main pipe, a feed branch pipe and a water inlet branch pipe that are interconnected. The feed main pipe and the water inlet branch pipe are connected in parallel and connected to the same end of the feed branch pipe. The other end of the feed branch pipe is connected to the roasting feed pipeline. The feed main pipe is connected to the top spray gun 4 of the roasting furnace 5, and the water inlet branch pipe is connected to the desalted water inlet pipeline. As shown in Figure 1, the feed main pipe, the feed branch pipe and the water inlet branch pipe are interconnected. In production mode, the feed branch pipe and the feed main pipe are opened, the water inlet branch pipe is closed, and the roasting furnace 5 is fed. In cleaning mode, the feed branch pipe and the water inlet branch pipe are opened, the feed main pipe is closed, and the desalted water is fed in the reverse direction along the roasting feed pipeline, realizing the feeding and water inlet functions of the liquid inlet module.

[0024] In order to control the opening and closing of each pipeline, a main pipe liquid inlet valve 10 is provided on the main feed pipe, a branch pipe liquid inlet valve 9 is provided on the branch feed pipe, and a water inlet valve 11 is provided on each water inlet branch pipe.

[0025] In order to realize intelligent management and control, the superposition valve 6, the reflux valve 7, the drain valve 8, the main pipe liquid inlet valve 10, the branch pipe liquid inlet valve 9 and the water inlet valve 11 are all automatic valves, which are controlled by the control system of the acid regeneration system to realize the intelligent operation of the acid regeneration system.

[0026] In order to detect the pressure or flow of each pipeline in real time, the pre-concentration circulation pipeline, the connecting pipeline of the stacking valve 6, the connecting pipeline of the reflux valve 7, the main feed pipe and the feed branch pipe are all equipped with detectors for detecting the pressure or flow in the pipe. This is convenient for ensuring that the pressure or flow in the pipeline tends to be stable during intelligent operation, which is beneficial to improving the safety of system operation.

[0027] The operating method of the utility model includes automatic start-up operation and emergency shutdown for cleaning;

[0028] The automatic start-up operation is as follows: when the waste liquid in the pre-concentrator 1 reaches the pump start level, the pre-concentration circulation pump 2 automatically starts to start the pre-concentration cycle;

[0029] After the operating pressure or flow of the pretreatment circulation pipeline is stabilized, the stacking valve 6 is automatically opened to start supplying liquid to the roasting furnace feed pump 3, and the roasting furnace feed pump 3 is automatically started;

[0030] After the operating pressure of the roasting furnace feed pump 3 is stabilized, the reflux pipeline is automatically opened to maintain the stable operating pressure and flow of the roasting furnace feed pump 3;

[0031] When the system switches to production mode, the acid inlet and outlet ends of the liquid inlet module are automatically opened to feed liquid into the spray gun 4 at the top of the roasting furnace 5. When the liquid flow or pressure of the spray gun 4 stabilizes, the reflux valve 7 is automatically closed.

[0032] Emergency shutdown cleaning is as follows:

[0033] When the machine is shut down or in emergency, the roasting furnace feed pump 3 stops, the stacking valve 6 automatically closes, the spray gun 4 automatically stops spraying, and the sewage pipe and / or return pipe are automatically opened to drain the remaining liquid in the pipe;

[0034] The system enters the automatic cleaning state, automatically closes the acid outlet end of the liquid inlet module and opens the water inlet end of the liquid inlet module, and flows water from the water inlet end to the acid inlet end to flush the roasting feed pipeline;

[0035] When the flushing discharge liquid becomes clear, the reflux valve 7, the sewage valve 8 and the desalted water inlet pipeline are automatically closed until entering the next production cycle.

[0036] The operating method of the utility model is provided with two operating modes, namely automatic start-up operation and emergency shutdown and cleaning. In the automatic start-up operation mode, the pre-concentration circulation pipeline, the reflux pipeline and the roasting feed pipeline are gradually opened, thereby ensuring the stable operation of the acid regeneration system production. In the emergency shutdown and cleaning mode, water is reversely fed along the original roasting feed pipeline, and the eluate is discharged by gravity, thereby realizing the intelligent operation of the acid regeneration system, being simple to operate, having a simple system structure, low energy consumption, stable pipe pressure and greatly improved operation safety.

[0037] More specifically, when the automatic start-up operation is performed, the branch pipe liquid inlet valve 9 and the main pipe liquid inlet valve 10 in the liquid inlet module are automatically opened, that is, the acid inlet end and the acid outlet end of the liquid inlet module are automatically opened;

[0038] During emergency shutdown and cleaning, the main pipe liquid inlet valve 10 in the liquid inlet module is automatically closed and the desalted water inlet valve 11 is automatically opened, that is, the acid outlet end of the liquid inlet module is automatically closed and the water inlet end of the liquid inlet module is opened.

[0039] In order to ensure the simultaneous and stable operation of the pre-concentration circulation pipeline and the other two pipelines, during the automatic startup operation, the roaster feed pump 3 can only be started when the pre-concentration circulation pump 2 is running stably, to prevent the two pumps from starting at the same time and the operation of the roaster feed pump 3 causing a significant reduction in the flow rate in the pre-concentration circulation pipeline.

[0040] In order to avoid the crystallization of residual acid in the pipe after cleaning, when the flushing discharge liquid becomes clear, first close the reflux valve 7 and the drain valve 8, and then close the desalted water inlet pipeline; before entering the next production cycle, open the drain valve 8 to discharge the stored water in the equipment and pipeline.

[0041] More specifically, after automatically closing the reflux valve 7 and the drain valve 8, the desalted water valve is closed after the pressure reaches 0.25-0.3 MPa. The pressure here refers to the pressure upstream of the desalted water valve, which is equipped with a regulating valve and a pressure gauge. The desalted water valve is closed when the value on the pressure gauge reaches 0.25-0.3 MPa.

[0042] Among them, desalted water can also be replaced by pure water.

[0043] In order to more conveniently collect the acid liquid, a special collection device is provided at the tail end of the drain pipeline, the effective volume of which is not less than 1.5 to 2 times the total volume of each device and pipeline in the acid regeneration system to avoid overflow of the collection device during collection. The collection device can be an acid pit or an acid storage tank.

[0044] The pre-concentrator 1 and the collecting device are both connected to the original storage device of the acid solution. When the acid solution in the collecting device reaches a certain level, it can flow back to the original storage device of the acid solution for standby use so as to be processed in the next production cycle.

[0045] In a specific extended embodiment, the waste acid liquid from pickling first enters the pre-concentrator 1 and reaches the pump start level, and the pre-concentration circulation pump 2 is started. The waste heat of the high-temperature flue gas generated by the roasting furnace 5 is used to fully exchange heat between the waste acid liquid from pickling and the high-temperature flue gas, thereby achieving efficient concentration. After the operating pressure or flow of the pre-concentration system stabilizes, the stacking valve 6 is automatically opened, and stacking begins to supply liquid to the roasting furnace feed pump 3. The roasting furnace feed pump 3 is then started, and the spray gun 4 system is opened for exhaust. After the operating pressure of the roasting furnace feed pump 3 stabilizes, the spray gun 4 is closed, and the reflux valve 7 is automatically opened to maintain stable and reliable operation of the roasting furnace 5 feed pipeline. When the roasting furnace 5 feed pipeline is stable, the entire system is then switched to production mode, and the feed branch pipe inlet valve 9 and the feed main pipe inlet valve 10 of the roasting furnace 5 feed system are automatically opened. When the liquid inlet flow or pressure of the spray gun 4 system is stable, the reflux valve 7 is automatically closed, thereby ensuring stable production of the acid treatment system.

[0046] When the machine is shut down or in an emergency stop, the roaster feed pump 3 stops running, the stack valve 6 automatically closes, and the reflux valve 7 and / or drain valve 8 automatically open. At this point, the spray gun 4 also stops spraying immediately, the main feed pipe inlet valve 10 automatically closes, and the desalted water inlet valve 11 automatically opens. Desalted water or pure water flushes the roaster feed pipeline in reverse through the desalted water inlet valve 11 and the feed branch pipe inlet valve 9, thereby preventing concentrated acid from crystallizing and clogging the equipment and pipelines. When the flushing discharge is essentially clean, the desalted water inlet valve 11 and the feed branch pipe inlet valve 9 automatically close, and the reflux valve 7 and / or drain valve 8 automatically close, ensuring that the concentrated acid equipment and pipelines store an appropriate amount of desalted water or purified water until the next production cycle begins.

[0047] When only reflux valve 7 is open, the effluent is discharged by gravity into pre-concentrator 1 for storage. When only drain valve 8 is open, the effluent is discharged by gravity into a dedicated collection device, such as an acid pit or acid storage tank. When both reflux valve 7 and drain valve 8 are open, the effluent is discharged by gravity, partially into pre-concentrator 1 and partially into a dedicated collection device. In all three cases, the previously opened reflux valve 7 and / or drain valve 8 are closed upon completion of cleaning.

[0048] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of the present invention specification should be included in the protection scope of the present invention.

Claims

1. An intelligent acid regeneration system for preventing crystallization blockage, comprising a preconcentrator and a roaster, wherein the gas outlet of the roaster is connected to the top of the preconcentrator through a flue gas pipeline, the liquid outlet of the preconcentrator is connected to the top of the preconcentrator through a preconcentration circulation pipeline, the liquid outlet of the preconcentrator is connected to the top of the roaster through a roasting feed pipeline, the preconcentrator circulation pump is provided on the preconcentration circulation pipeline, and the roasting feed pipeline is provided with a roasting furnace feed pump, characterized in that: The pre-concentration circulation pipeline and the roasting feed pipeline share a section of pipeline connected to the liquid outlet end of the pre-concentrator, the roasting feed pipeline is also provided with a stacking valve, the lowest end of the roasting feed pipeline is connected to a sewage discharge pipeline with a sewage discharge valve, a liquid inlet module is provided between the roasting feed pipeline and the top spray gun of the roasting furnace, a desalted water inlet pipeline is connected to the liquid inlet module, a reflux pipeline is connected to the connecting pipeline between the roasting furnace feed pump and the liquid inlet module, the output end of the reflux pipeline is connected to the bottom of the pre-concentrator, and a reflux valve is provided on the reflux pipeline.

2. The intelligent acid regeneration system for preventing crystallization blockage according to claim 1 is characterized in that: The liquid inlet module includes a main feed pipe, a feed branch pipe and a water inlet branch pipe. The main feed pipe and the water inlet branch pipe are connected in parallel to the same end of the feed branch pipe. The other end of the feed branch pipe is connected to the roasting feed pipeline. The main feed pipe is connected to the top spray gun of the roasting furnace, and the water inlet branch pipe is connected to the desalted water inlet pipeline.

3. The intelligent acid regeneration system for preventing crystallization blockage according to claim 2 is characterized in that: The main feed pipe is provided with a main pipe liquid inlet valve, the branch feed pipe is provided with a branch pipe liquid inlet valve, and the water inlet branch pipes are both provided with water inlet valves.

4. The intelligent acid regeneration system for preventing crystallization blockage according to claim 3 is characterized in that: The stacking valve, reflux valve, drain valve, main pipe liquid inlet valve, branch pipe liquid inlet valve and water inlet valve are all self-controlled valves.

5. The intelligent acid regeneration system for preventing crystallization blockage according to claim 4 is characterized in that: The pre-concentration circulation pipeline, the connection pipeline of the stacking valve, the connection pipeline of the reflux valve, the main feed pipe and the feed branch pipe are all provided with detectors for detecting the pressure or flow in the pipe.

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