CN111591961A - Concentrated sulfuric acid purification equipment and purification process applying same - Google Patents
Concentrated sulfuric acid purification equipment and purification process applying same Download PDFInfo
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- CN111591961A CN111591961A CN202010563426.3A CN202010563426A CN111591961A CN 111591961 A CN111591961 A CN 111591961A CN 202010563426 A CN202010563426 A CN 202010563426A CN 111591961 A CN111591961 A CN 111591961A
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- C01B17/00—Sulfur; Compounds thereof
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- C01B17/90—Separation; Purification
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Abstract
A concentrated sulfuric acid purification device is used for purifying concentrated sulfuric acid and comprises a quartz glass component, a raw material acid supply device and a cooling tank, wherein the quartz glass component is used for boiling the concentrated sulfuric acid through electric heating; the quartz glass component is prepared from quartz glass and SiO2The content of the quartz glass component reaches more than 99.97 percent, and the quartz glass component is welded by adopting a full-closed field welding technology, the allowable working temperature is not lower than 1100 ℃, and the linear expansion coefficient of the quartz glass component does not exceed 5.56 × 10 at the temperature‑7. The concentrated sulfuric acid purification equipment disclosed by the invention has the advantages of high daily yield, small occupied area, low power consumption, continuous production and process yield up to 95%; and the visual production of realization, atmospheric pressure resistance, hot pressing performance obtain guaranteeing to eliminate the impact that presents the power of certain frequency that karman vortex street effect produced, maintained the life of equipment.
Description
Technical Field
The invention relates to the field of concentrated sulfuric acid purification, in particular to concentrated sulfuric acid purification equipment which is prepared by welding a quartz glass material by adopting a fully-closed field welding technology, wherein SiO is2The content reaches more than 99.97 percent, and also relates to a concentrated sulfuric acid purification process based on the purification equipment.
Background
Concentrated sulfuric acid with chemical formula of H2SO4It is a strong mineral acid with high corrosivity, concentrated sulfuric acid has strong oxidizing property when its concentration is high, and it is one of the biggest differences from ordinary sulfuric acid or ordinary concentrated sulfuric acid, and at the same time it also has dehydration property, strong oxidizing property, strong corrosivity, difficult volatility, acidity and water absorption property, etc.. The existing sulfuric acid purification device obtains purified sulfuric acid after heating the sulfuric acid by a heating evaporator and then exchanging heat and cooling the sulfuric acid by a heat exchanger.
Based on the chemical properties of concentrated sulfuric acid, the existing concentrated sulfuric acid purification equipment is made of materials such as nickel-chromium alloy or ceramics, or is made of steel lined with enamel cylinder and polytetrafluoroethylene, such as equipment for purifying waste sulfuric acid with application number 2007101426410; the equipment has high strength and stability but no visibility, and is heavy and large in occupied area, so that the equipment is not suitable for the requirements at present.
The glass equipment has high corrosion resistance and thermal conductivity, can be selected as purification equipment, but the preparation of the glass equipment for purifying concentrated sulfuric acid is complex, the process is difficult to ensure, and a plurality of ground openings exist. The grinding opening has unremoved stress, and the service life is short under the comprehensive action of air pressure, hot pressing and weight of the tube in the continuous production process; in order to reduce the system load, the daily output of the existing equipment for purifying concentrated sulfuric acid prepared by glass is at a lower level.
Disclosure of Invention
The present invention provides a concentrated sulfuric acid purification apparatus and a purification process using the same to solve the problems of the background art, and the present invention is further described below.
A concentrated sulfuric acid purification device is used for purifying concentrated sulfuric acid and comprises a quartz glass component, a raw material acid supply device and a cooling tank, wherein the quartz glass component is used for boiling the concentrated sulfuric acid through electric heating; the quartz glass component is prepared from quartz glass and SiO2The content of the quartz glass component reaches more than 99.97 percent, and the quartz glass component is welded by adopting a full-closed field welding technology, the allowable working temperature is not lower than 1100 ℃, and the linear expansion coefficient of the quartz glass component does not exceed 5.56 × 10 at the temperature-7。
The quartz glass component comprises a heating pipe internally provided with a heating device, an expanded buffer cavity is arranged at the upper end of the heating pipe, a slag containing cavity is arranged at the lower end of the heating pipe, and a slag discharging valve is arranged on the slag containing cavity; the steam pipe is communicated with the top of the heating pipe through a communicating pipe, a raw material pipe is arranged in the bottom of the steam pipe, a gap is reserved between the raw material pipe and the bottom of the steam pipe, the top of the raw material pipe penetrates through the steam pipe and is communicated with the heating pipe, the bottom of the raw material pipe penetrates through the steam pipe and is communicated with the heat exchange pipe, and the bottom of the steam pipe is also communicated with the heat exchange pipe; the top of the steam pipe is communicated with a dilute acid pipe, one end of the dilute acid pipe is communicated with a tail gas recovery device, and the other end of the dilute acid pipe is connected to a cooling tank; in the heat exchange tube, a heat exchange inner tube communicated to the bottom of the steam tube is arranged, the top of the heat exchange tube is communicated with the steam tube through a bridge tube, the bottom of the heat exchange tube is communicated to the raw material acid supply device, and the heat exchange inner tube penetrates through the bottom of the heat exchange tube and is connected to the cooling tank.
Optionally, no ground is present in the quartz glass at any of the joints of the quartz glass assembly.
Optionally, the heat exchange inner tube is spiral, the obtained concentrated sulfuric acid flows downwards in the heat exchange inner tube, and the raw material acid reversely flows from the bottom to the top of the heat exchange tube.
Optionally, the quartz glass assemblies are single-group or multiple groups of purification systems connected together to form parallel connection and work simultaneously, and for a system in which multiple groups of quartz glass assemblies are used in parallel, the bottom of the heat exchange tube of any one group of quartz glass assembly is connected to a raw acid supply device, and the raw acid is supplied by the raw acid supply device and is distributed to all the quartz glass assemblies.
Optionally, the raw acid supply device comprises a raw acid storage tank for storing the raw acid in a large capacity, and the bottom of the raw acid storage tank is connected to a high-level tank for storing potential energy at a high level through an acid pump; or, the elevated tank is connected to the level tank through a pipeline which is provided with an acid inlet valve and arranged at the bottom, each group of quartz glass components is provided with one level tank, the installation height of the level tank is consistent with the height of the heating pipe, the concentrated sulfuric acid liquid level for balancing the heating pipe is on a horizontal line, the quartz glass components are guaranteed to be always acid when working, when the liquid in the level tank is lower than a certain liquid level, the acid inlet valve is automatically opened by an inductor arranged on the level tank, and when the liquid level is higher than the certain liquid level, the acid inlet valve is automatically closed.
Optionally, the heat exchange inner tube is provided with glass beams connected to the heat exchange tube at certain intervals, the glass beams are circumferentially arrayed around the axial lead of the heat exchange inner tube, and the plurality of glass beams bear acting force generated by the karman vortex street effect.
A concentrated sulfuric acid purification process comprises the following steps:
the raw material acid is stored in a high position, and the raw material acid in the raw material acid tank is pressed into the high position tank by an acid pump;
the raw material acid is automatically supplied, the raw material acid automatically flows into the leveling tank under the action of gravity, the acid inlet valve is started when the leveling tank is at a low position, the acid inlet valve is closed when the leveling tank is at a high position, and the acid liquid is always kept in the heating pipe;
heating and purifying, wherein a heating device heats the raw acid liquid to boiling, the volatilized heavier gas is cooled into pure concentrated sulfuric acid liquid in a steam pipe, and meanwhile, the raw acid in the raw material pipe and the heat exchange pipe is preheated by flowing downwards automatically, then flows through a cooling tank for cooling, and finally flows into a concentrated sulfuric acid storage tank by flowing automatically; the volatilized lighter gas is partially changed into dilute sulfuric acid when meeting cold at the top end of the dilute acid pipe, is cooled by the cooling tank and then automatically flows to a dilute sulfuric acid storage tank, and the other part of the volatilized lighter gas becomes tail gas (acid mist) and enters an acid mist treatment system.
Has the advantages that: compared with the prior art, the concentrated sulfuric acid purification equipment can be provided with a purification system consisting of 60 sets of quartz glass components, the daily output can reach 23040KG, and the output is greatly improved; moreover, the occupied area is small, the power consumption is reduced to 333-375 kilowatt-hour/ton, the continuous production can be carried out for 24 hours, and the process yield can reach 95 percent; the visual production is realized, and the working state in the purification device is visually displayed; the whole device has small linear expansion coefficient, ensures the air pressure resistance and the hot pressing performance, eliminates the impact of force with certain frequency generated by the Karman vortex street effect, and maintains the service life of the equipment.
Drawings
FIG. 1: the invention has a structure schematic diagram;
FIG. 2: FIG. 1 is a partial schematic view of the structure;
FIG. 3: the structure at A in FIG. 2 is enlarged schematically;
FIG. 4: the invention relates to a purification process flow chart;
in the figure: the device comprises a quartz glass component 10, a heating pipe 110, a heating device 111, a buffer cavity 112, a slag containing cavity 113, a slag discharging valve 114, a steam pipe 120, a communicating pipe 130, a raw material pipe 140, a heat exchange pipe 150, a heat exchange inner pipe 160, a bridge pipe 170, a dilute acid pipe 180, a glass beam 190, a cooling tank 20, a raw material acid supply device 30, a concentrated sulfuric acid storage tank 40, a dilute sulfuric acid storage tank 50, a raw material acid storage tank 60, an acid pump 70, a high-level tank 80 and a leveling tank 90.
Detailed Description
A specific embodiment of the present invention will be described in detail with reference to the accompanying drawings.
A concentrated sulfuric acid purification device is used for purifying concentrated sulfuric acid and comprises a quartz glass component 10 which is used for boiling the concentrated sulfuric acid by electric heating and is prepared from quartz glass SiO2The content reaches more than 99.97 percent, and the glass is welded by adopting a fully-closed field welding technology, thereby solving the technical problem of ground connection of common glass.
Proved that SiO2The quartz glass equipment with the content of more than 99.97 percent has good corrosion resistance, excellent chemical stability and high transparency, the allowable working high temperature reaches 1100 ℃, and the maximum linear expansion coefficient of 5.56 × 10 at 1000 ℃ is 5.56 8910-71/10-1/20, which is common glass, has high inherent quenching and quick heating resistance, and the quartz glass component 10 is nearly not expanded and the system is stable at the temperature of boiling raw materials during the purification process of concentrated sulfuric acid purification.
The invention can resist the corrosion of various acids, aqua regia, neutral salt, sulfur and carbon at normal temperature or high temperature except hydrofluoric acid and phosphoric acid, and can resist the corrosion of P and C at the temperature below 800 DEG CbBesides O, the glass is not corroded by metal oxides and is not reflected by sodium sulfate, the chemical stability of the glass is 150 times greater than that of nickel-chromium alloy and ceramics, and the problems of environmental pollution and insecurity caused by gas-liquid leakage, overflow, dripping, leakage, sudden cooling and thermal explosion and the like in the process of concentrated sulfuric acid evaporation and purification of common glass equipment are solved.
The quartz glass assembly 10 comprises a heating pipe 110 with a built-in heating device 111, the heating device 111 is electrified to generate heat to heat raw material acid in the heating pipe 110 until the raw material acid is boiled, an expanded buffer cavity 112 is arranged at the upper end of the heating pipe 110, a slag containing cavity 113 is arranged at the lower end of the heating pipe, residues which are not decomposed after the raw material acid is boiled are contained, a slag discharging valve 114 is arranged on the slag containing cavity, and slag discharging is started after a period of time.
The heating tube is characterized by further comprising a steam tube 120 communicated with the heating tube 110, the lower part of the steam tube 120 is communicated with the top of the heating tube 110 through a communicating tube 130, a raw material tube 140 is arranged in the bottom of the steam tube 120, a gap is reserved between the raw material tube 140 and the bottom of the steam tube 120, the top of the raw material tube 140 penetrates through the steam tube 120 and is communicated with the heating tube 110, the bottom penetrates through the steam tube 120 and is communicated with a heat exchange tube 150, and; the top of the steam pipe 120 is communicated with a dilute acid pipe 180, one end of the dilute acid pipe 180 is communicated with the tail gas recovery device, and the other end is connected to the cooling tank 20.
In the heat exchange pipe 150, a heat exchange inner pipe 160 communicated to the bottom of the steam pipe 120 is provided, the top of the heat exchange pipe 150 is communicated to the steam pipe 120 through a bridge pipe 170, the bottom is communicated to the raw acid supply device, and the heat exchange inner pipe 160 penetrates the bottom of the heat exchange pipe 150 and is connected to the cooling tank 20.
It is worth noting that the quartz glass component 10 is manufactured by adopting a fully-closed field welding technology, so that any connecting part, especially the key penetrating part of each quartz glass, does not have a ground, and the optimal performances of closing, thermal stress resistance and the like are achieved.
The heat exchange tube 150 preheats before the raw material acid enters the raw material tube 140, and precools the obtained concentrated sulfuric acid, preferably, the heat exchange inner tube 160 is spiral, the obtained concentrated sulfuric acid flows downwards in the heat exchange inner tube 160, the raw material acid reversely flows from the bottom to the top of the heat exchange tube 150, the heat exchange area is increased, and the heat exchange efficiency is improved.
In the quartz glass assembly 10, the raw acid from the raw acid supply device enters the heat exchange tube 150, flows to the top in the cavity between the heat exchange tube 150 and the heat exchange inner tube 160, enters the raw material tube 140 inside the steam tube 120 through the bridge tube 170, then enters the heating tube 110 through the communicating tube 130, is boiled and evaporated under the heating of the heating device 111, flows through the communicating tube 130 from the top, enters the steam tube 120, a part of the lighter gas is changed into dilute sulfuric acid when meeting cold at the top end, enters the cooling tank 20 through the dilute acid tube 180 for cooling, and the heavier concentrated sulfuric acid flows down along the inner wall of the steam tube 120 along the lighter gas, contacts the raw material tube 140 firstly for heat exchange, and then enters the heat exchange inner tube 160 through the bottom.
The quartz glass units 10 according to the present invention can be tested individually or, preferably, a plurality of sets of purification systems connected together to form a parallel and simultaneous operation are adopted to improve the production efficiency, and specifically, the bottom of the heat exchange tube 150 of any one set of quartz glass unit 10 is connected to a raw acid supply device, and the raw acid is supplied from the raw acid supply device and is distributed to all the quartz glass units 10.
Concentrated sulfuric acid flowing out of the heat exchange tube 150 is cooled by the cooling tank 20 and then automatically flows to the concentrated sulfuric acid storage tank 40, a part of lighter gas in the dilute acid tube 180 is cooled at the top end and is changed into dilute sulfuric acid, the dilute sulfuric acid is cooled by the cooling tank 20 and then automatically flows to the dilute sulfuric acid storage tank 50, and the other part of the lighter gas becomes tail gas (acid mist) and enters the acid mist treatment system.
The raw acid supply device 30 is used as a raw acid supply device of the quartz glass assembly 10, and needs to ensure the supply of large flow of dilute sulfuric acid, and comprises a raw acid storage tank 60 for storing raw acid in large capacity, the bottom of the raw acid storage tank 60 is connected to a high-level tank 80 for storing potential energy at a high position through an acid pump 70, the high-level tank 80 supplies the raw acid to the quartz glass assembly 10 through gravitational potential energy, or preferably, the high-level tank 80 is connected to the level tank 90 through a pipe with an acid inlet valve provided at the bottom, one level tank 90 is provided for each set of the silica glass assembly 10, the concentrated sulfuric acid liquid level for balancing the heating pipe 110 is on a horizontal line, so that the quartz glass component 10 is always acid when in work, when the liquid in the level tank is lower than a certain liquid level, the sensor arranged on the level tank 90 automatically opens the acid inlet valve, and when the liquid level is higher than a certain liquid level, the acid inlet valve is automatically closed.
In addition, according to the principle of communicating vessels, in order to make the level tank 90 balance the concentrated sulfuric acid liquid level of the heating pipe 110 on a horizontal line, the installation height of the level tank 90 is consistent with the height of the heating pipe 110.
The quartz glass material adopted by the invention is prepared in a fully-closed on-site welding environment, so that the problem of large equipment field consumption in the prior art is solved, the purification process is visualized, but the service life of the invention is not ideal in the test, and the fracture frequency of the joint of the heat exchange tube 150 and the heat exchange inner tube 160 is the largest. Through analysis, the main cause of the fracture of the heat exchange inner tube 160 is the karman vortex street effect, referring to fig. 3, the raw material acid flows from the bottom to the top of the heat exchange tube 150, the heat exchange inner tube 160 obstructs the flow of the raw material acid, at a certain moment, the raw material acid flows through the heat exchange inner tube 160 and obstructs more flow through a certain side, when the flow rate of the side is faster than the other side, the pressure is smaller than the other side, a radial pressure F to the heat exchange inner tube 160 is generated, a reverse acting force is generated at the next moment, and as a whole, the raw material acid fluid generates an acting force with a constantly changing acting direction to the heat exchange inner tube 160, so that the heat exchange inner tube 160 generates vibration with. On one hand, the purification equipment prepared by the quartz glass material with low hardness and brittleness is adopted, and the connection part of the heat exchange tube 150 and the heat exchange inner tube 160 is just a weak link, so that fatigue and fracture occur for a long time; on the other hand, the heat exchange inner tube 160 vibrates at a certain frequency, and when the vibration frequency is close to the natural resonance frequency, resonance is caused, and the heat exchange inner tube 160 is broken even immediately after reinforcement; on the other hand, in order to improve the purification efficiency, the plural sets of quartz glass assemblies 10 adopted in the present invention make the supply rate of the raw material acid in a higher flow rate state, according to the mechanical equation of the karman vortex street effect, under the sulfuric acid of the raw material acid, F is 0.22 · v/d, the high flow rate makes the acting force in a larger level, and the frequency may also approach the resonance frequency of the heat exchange inner tube 160 at a certain moment.
Based on the above analysis, the solution of the present invention is as follows: the heat exchange inner pipe 160 is provided with glass beams 190 connected to the heat exchange pipe 150 at certain intervals, the glass beams 190 are circumferentially arrayed around the axial lead of the heat exchange inner pipe 160, and the plurality of glass beams 190 bear acting force generated by the Karman vortex street effect to maintain the stability of the equipment.
The invention also provides a concentrated sulfuric acid purification process based on concentrated sulfuric acid purification equipment, which comprises the following steps:
the raw material acid is stored in high position, and the raw material acid in the raw material acid tank 60 is pressed into a high position tank 80 by an acid pump 70;
the raw material acid is supplied by self-flowing, the raw material acid enters the leveling tank 90 by self-flowing under the action of gravity, the acid inlet valve is started when the leveling tank 90 is at a low position, the acid inlet valve is closed when the leveling tank is at a high position, and the acid liquid is always kept in the heating pipe 110.
Heating and purifying, wherein the heating device 111 heats the raw acid liquid to boiling, the volatilized heavier gas is cooled in the steam pipe 120 to be pure concentrated sulfuric acid liquid, and meanwhile, the raw acid in the raw material pipe 140 and the heat exchange pipe 150 is preheated by flowing downwards automatically, flows through a cooling tank for cooling, and finally flows into the concentrated sulfuric acid storage tank 40 by flowing automatically; the volatilized lighter gas is partially changed into dilute sulfuric acid when meeting cold at the top end of the dilute acid pipe 180, is cooled by the cooling tank 20 and then automatically flows to the dilute sulfuric acid storage tank 50, and the other part of the volatilized lighter gas becomes tail gas (acid mist) and enters an acid mist treatment system.
Through tests, the concentrated sulfuric acid purification equipment can be composed of 60 sets of quartz glass components 10, the production capacity of each set of equipment is 16-18 KG/h, the equipment works for 24 hours each day on average, the daily output reaches 16 × 60 × 24 ═ 23040KG, and the output is greatly improved; in addition, the floor area is small, the power consumption is reduced to 333-375 kilowatt-hour/ton, the continuous production can be carried out for 24 hours, and the process yield can reach 95 percent.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A concentrated sulfuric acid purification apparatus for purifying concentrated sulfuric acid comprises a quartz glass assembly 10 for boiling concentrated sulfuric acid by electric heating, a raw acid supply device 30 for supplying raw acid to the quartz glass assembly 10, and a cooling tank 20 for cooling acid solution purified by the quartz glass assembly 10; the method is characterized in that:
the quartz glass component 10 is made of quartz glass, SiO thereof2The content of the quartz glass component reaches more than 99.97 percent, and the quartz glass component is welded by adopting a full-closed field welding technology, the allowable working temperature is not lower than 1100 ℃, and the linear expansion coefficient of the quartz glass component 10 at the temperature is not more than 5.56 × 10-7。
2. The concentrated sulfuric acid purification apparatus according to claim 1, wherein: the quartz glass component (10) comprises a heating pipe (110) internally provided with a heating device (111), an expanded buffer cavity (112) is arranged at the upper end of the heating pipe (110), a slag containing cavity (113) is arranged at the lower end of the heating pipe, and a slag discharging valve (114) is arranged on the slag containing cavity; the heating device also comprises a steam pipe (120) communicated with the heating pipe (110), the lower part of the steam pipe (120) is communicated with the top of the heating pipe (110) through a communicating pipe (130), a raw material pipe (140) is arranged in the bottom of the steam pipe (120), a gap is reserved between the raw material pipe (140) and the bottom of the steam pipe (120), the top of the raw material pipe (140) penetrates through the steam pipe (120) and is communicated with the heating pipe (110), the bottom penetrates through the steam pipe (120) and is communicated with a heat exchange pipe (150), and the bottom of the steam pipe; the top of the steam pipe (120) is communicated with a dilute acid pipe (180), one end of the dilute acid pipe (180) is communicated with a tail gas recovery device, and the other end of the dilute acid pipe is connected to the cooling tank (20); and a heat exchange inner pipe (160) communicated to the bottom of the steam pipe (120) is arranged in the heat exchange pipe (150), the top of the heat exchange pipe (150) is communicated with the steam pipe (120) through a bridge pipe (170), the bottom of the heat exchange pipe is communicated to the raw material acid supply device (30), and the heat exchange inner pipe (160) penetrates through the bottom of the heat exchange pipe (150) and is connected to the cooling tank (20).
3. The concentrated sulfuric acid purification apparatus according to claim 2, wherein: at any joint of the quartz glass component (10), no ground exists in the quartz glass.
4. The concentrated sulfuric acid purification apparatus according to claim 3, wherein: the heat exchange inner pipe (160) is spiral, the obtained concentrated sulfuric acid flows downwards in the heat exchange inner pipe (160), and the raw material acid reversely flows from the bottom to the top of the heat exchange pipe (150).
5. The concentrated sulfuric acid purification apparatus according to claim 2, wherein: the quartz glass components (10) are single groups or multiple groups of purification systems which are connected together to form parallel connection and work simultaneously, for a system in which multiple groups of quartz glass components (10) are used in parallel, the bottoms of the heat exchange tubes (150) of any one group of quartz glass components (10) are connected to a raw material acid supply device (30), and the raw material acid is supplied by the raw material acid supply device (30) and is distributed to all the quartz glass components (10).
6. The concentrated sulfuric acid purification apparatus according to claim 1, wherein: the raw material acid supply device (30) comprises a raw material acid storage tank (60) for storing raw material acid in a large capacity, and the bottom of the raw material acid storage tank (60) is connected to a high-level tank (80) for storing potential energy at a high level through an acid pump (70); or, the high-level tank (80) is connected to the leveling tank (90) through a pipeline with an acid inlet valve arranged at the bottom, each group of quartz glass components (10) is provided with one leveling tank (90), the installation height of the leveling tank (90) is consistent with the height of the heating pipe (110), the concentrated sulfuric acid liquid level for balancing the heating pipe (110) is on a horizontal line, the quartz glass components (10) are guaranteed to have acid all the time when working, when the liquid of the leveling tank is lower than a certain liquid level, the acid inlet valve is automatically opened by an inductor arranged on the leveling tank (90), and when the liquid level is higher than the certain liquid level, the acid inlet valve is automatically closed.
7. The concentrated sulfuric acid purification apparatus according to claim 1, wherein: the heat exchange tube is characterized in that glass beams (190) connected to the heat exchange tube (150) are arranged on the heat exchange inner tube (160) at intervals, the glass beams (190) are circumferentially arrayed around the axial lead of the heat exchange inner tube (160), and the plurality of glass beams (190) are used for bearing acting force generated by the Karman vortex street effect.
8. A concentrated sulfuric acid purification process is characterized by comprising the following steps:
the raw material acid is stored in high position, and the raw material acid in the raw material acid tank (60) is pressed into a high position tank (80) through an acid pump (70);
the raw material acid is automatically supplied, the raw material acid automatically flows into the leveling tank (90) under the action of gravity, the acid inlet valve is started when the leveling tank (90) is at a low position, the acid inlet valve is closed when the leveling tank is at a high position, and the acid liquid is always kept in the heating pipe (110);
heating and purifying, wherein a heating device (111) heats the raw acid liquid to boiling, the volatilized heavier gas is cooled in a steam pipe (120) to be pure concentrated sulfuric acid liquid, and meanwhile, the raw acid in a raw material pipe (140) and a heat exchange pipe (150) is preheated by flowing downwards automatically, then flows through a cooling tank to be cooled, and finally flows into a concentrated sulfuric acid storage tank (40) by flowing automatically; the volatilized lighter gas is partially changed into dilute sulfuric acid when meeting cold at the top end of the dilute acid pipe (180), is cooled by the cooling tank (20) and then automatically flows to the dilute sulfuric acid storage tank (50), and the other part of the volatilized lighter gas becomes tail gas (acid mist) and enters the acid mist treatment system.
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| CN114455552B (en) * | 2022-03-07 | 2023-03-31 | 盛隆资源再生（无锡）有限公司 | Treatment device and treatment method for high-COD waste acid |
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Application publication date: 20200828 |