阅读说明：本技术 一种固体聚氯化铝的高效环保生产系统 (High-efficient environmental protection production system of solid polyaluminium chloride ) 是由 魏小兵 王明冬 邹宏 李书富 秦普端 于 2019-09-12 设计创作，主要内容包括：本发明公开了一种固体聚氯化铝的高效环保生产系统,属于聚氯化铝生产技术领域。固体聚氯化铝的高效环保生产系统包括依次连接的蒸发浓缩系统、真空冷却干燥系统和闪蒸干燥系统。本发明设计的蒸发浓缩系统、真空冷却干燥系统和闪蒸干燥系统,能将固含量为30％聚合氯化铝水溶液生产成固含量为91％以上的粉末聚氯化铝,真正实现了自动化、清洁生产,且生产的聚氯化铝产品质量指标达到了高氧化铝含量,高盐基度值,低水不溶物值和低重金属值的新聚氯化铝国标要求,同时还实现了产品多元化、能耗低、安全环保、产能高和物料循环利用的优点。(The invention discloses a high-efficiency environment-friendly production system of solid polyaluminium chloride, belonging to the technical field of polyaluminium chloride production. The high-efficiency environment-friendly production system of the solid polyaluminium chloride comprises an evaporation concentration system, a vacuum cooling and drying system and a flash evaporation and drying system which are sequentially connected. The evaporation concentration system, the vacuum cooling drying system and the flash evaporation drying system designed by the invention can produce the polyaluminum chloride aqueous solution with the solid content of 30 percent into the powdery polyaluminum chloride with the solid content of more than 91 percent, really realize automatic and clean production, and the quality index of the produced polyaluminum chloride product reaches the new polyaluminum chloride national standard requirements of high alumina content, high basicity value, low water insoluble substance value and low heavy metal value, and simultaneously realize the advantages of product diversification, low energy consumption, safety, environmental protection, high productivity and material recycling.)

1. The utility model provides a high-efficient environmental protection production system of solid polyaluminium chloride which characterized in that, evaporation concentration system, vacuum cooling drying system and flash drying system that connect gradually.

2. The system for efficient and environmentally friendly production of solid polyaluminum chloride of claim 1, wherein said evaporative concentration system comprises a triple-effect counter-current evaporation system;

the triple-effect countercurrent evaporation system is sequentially connected with the preheating device, the triple-effect unit, the triple-effect discharging device, the double-effect unit, the double-effect discharging device, the first-effect unit and the first-effect discharging device;

the three-effect unit, the two-effect unit and the one-effect unit respectively comprise a separating device, a circulating device and a heating device which are sequentially connected.

3. The system for the efficient and environment-friendly production of solid polyaluminium chloride as claimed in claim 2, wherein the heating devices of the three-effect unit and the two-effect unit are made of graphite, hastelloy or titanium material; the heating device of the first effect unit is made of hastelloy or titanium; the separation device is made of glass fiber reinforced plastic, hastelloy or titanium material; the circulating device is made of polytetrafluoroethylene, Hastelloy or a titanium material; the three-effect discharging device, the two-effect discharging device and the one-effect discharging device are all made of polytetrafluoroethylene, Hastelloy or titanium materials.

4. The system for efficient and environmentally friendly production of solid polyaluminum chloride of claim 2, wherein said evaporative concentration system further comprises a tail treatment system; the tail treatment system is connected with a three-effect countercurrent evaporation system; the tail treatment system comprises a first water storage device, a circulating water device, a surface condensing device and a sewage treatment system which are connected in sequence.

5. The system for efficient and environmentally friendly production of solid polyaluminum chloride according to claim 2, wherein said evaporative concentration system further comprises a storage device; and the storage devices are connected with a triple-effect countercurrent evaporation system and a vacuum cooling and drying system.

6. The system for efficient and environmentally friendly production of solid polyaluminum chloride of claim 5, further comprising a natural gas thermal oil system; the natural gas heat conduction oil system comprises a high-temperature heat conduction oil area and a low-temperature heat conduction oil area; the high-temperature heat conduction oil area is connected with a heat conduction oil inlet end of the first-effect unit; the low-temperature heat conduction oil area is connected with a heat conduction oil outlet end of the preheating device, a heat conduction oil outlet end of the first effect unit and a material storage device.

7. The efficient and environment-friendly production system of solid polyaluminium chloride as claimed in claim 4, wherein the vacuum cooling and drying system comprises a filtering device, a feeding device, a tube array heating device and a vacuum drying device which are connected in sequence; the vacuum cooling drying system also comprises a tailing processing system; the tailing processing system comprises a cyclone separation device, a mixing and condensing device, an injection device and a second water storage device which are connected in sequence; the mixed condensing device is connected with the second water storage device.

8. The system for high-efficiency and environment-friendly production of solid polyaluminium chloride as claimed in claim 7, wherein a powder remover is arranged in the vacuum drying device; the vacuum degree in the vacuum drying device is between-0.092 MPa and-0.085 MPa; the feeding amount of the vacuum drying device is 6.5-7.5T/h.

9. The system for efficient and environment-friendly production of solid polyaluminum chloride according to claim 7, wherein the tailing disposal system further comprises a first water circulating device, a second water circulating device and a third water circulating device; the first circulating water devices are connected with the spraying device and the second water storage device; the second circulating water devices are connected with the second water storage device and the sewage treatment system; and the third circulating water devices are connected with the mixed condensing device and the second water storage device.

10. The efficient and environment-friendly production system of solid polyaluminium chloride as claimed in claim 1, wherein the flash drying system comprises an air blowing device, an air heating device, a flash evaporation device, a first cyclone separation device, a second cyclone separation device, an induced air device and a washing device which are connected in sequence.

Technical Field

The invention relates to the technical field of polyaluminium chloride production, in particular to a high-efficiency environment-friendly production system of solid polyaluminium chloride.

Background

Polyaluminum chloride is commonly called as a water purifying agent, also called polyaluminum chloride, abbreviated as polyaluminum, and called PAC in English; it is a polyhydroxy, multinuclear complex cationic inorganic polymer flocculant, the solid product appearance is red brown, yellow or white solid powder, its chemical molecular formula is [ Al₂(OH)_nCl_6-n]_m(in the formula, n is more than or equal to 1 and less than or equal to 5, m is less than or equal to 10), wherein m represents the polymerization degree, n represents the neutral degree of the PAC product, is easy to dissolve in water, has stronger bridging adsorbability, and finally generates [ Al ] along with the physical changes of electrochemistry, agglomeration, adsorption, precipitation and the like in the hydrolysis process₂(OH)₃(OH)₃]Thereby achieving the purpose of purification.

The polyaluminium chloride is fundamentally different from the traditional inorganic coagulant in that the traditional inorganic coagulant is low-molecular crystal salt, the polyaluminium chloride is structurally composed of multi-element carboxyl complex with various forms, the flocculation precipitation speed is high, the applicable pH value range is wide, the corrosion to pipeline equipment is avoided, the water purification effect is obvious, the heavy metal ions such as water chromatics SS, COD, BOD, arsenic, mercury and the like can be effectively supported, and the polyaluminium chloride is widely applied to the fields of drinking water, industrial water and sewage treatment.

The current solid polyaluminium chloride production system consists of a coal-fired heat-conducting oil boiler, a roller drying system and a flash evaporation drying system. The existing solid polyaluminium chloride reaction device generally has the following defects: 1) the coal-fired heat conduction oil boiler directly discharges hydrogen chloride and dust pollution factors into the atmosphere in the production process, so that serious air pollution is caused; 2) the cylinder drying system who uses, the flow sets up rationally inadequately, makes that the workshop raise dust is heavy, waste gas scattered discharge is big, the operation is original can not effective control, product quality is not conform to the new national standard of poly aluminium, the workshop is clean poor to lead to drying energy consumption cost too high, and the handling of the dry solid poly aluminium chloride of process cylinder is also more wasted time and energy.

Disclosure of Invention

In view of the above, the present invention aims to provide a set of efficient and environment-friendly production system for solid polyaluminium chloride, which has the advantages of low cost, safety, environmental protection and high production efficiency.

The specific process system scheme of the invention is as follows:

the utility model provides a high-efficient environmental protection production system of solid polyaluminium chloride, includes the evaporation concentration system, vacuum cooling drying system and the flash drying system that connect gradually.

Further, the evaporative concentration system comprises a triple-effect counter-current evaporation system;

the triple-effect countercurrent evaporation system is sequentially connected with the preheating device, the triple-effect unit, the triple-effect discharging device, the double-effect unit, the double-effect discharging device, the first-effect unit and the first-effect discharging device; the three-effect unit, the two-effect unit and the one-effect unit respectively comprise a separating device, a circulating device and a heating device which are sequentially connected.

Further: the heating devices of the three-effect unit and the two-effect unit are made of graphite, hastelloy or titanium materials; the heating device of the first effect unit is made of hastelloy or titanium; the separation device is made of glass fiber reinforced plastic, hastelloy or titanium material; the circulating device is made of polytetrafluoroethylene, Hastelloy or a titanium material; the three-effect discharging device, the two-effect discharging device and the one-effect discharging device are all made of polytetrafluoroethylene, Hastelloy or titanium materials.

Further, the triple-effect unit comprises a triple-effect separation device, a triple-effect circulation device and a triple-effect heating device which are sequentially connected; the double-effect unit comprises a double-effect separation device, a double-effect circulation device and a double-effect heating device which are sequentially connected; the first effect unit comprises a first effect separation device, a first effect circulation device and a first effect heating device which are sequentially connected.

Wherein the working temperature of the two-effect heating device and the one-effect heating device is less than 150 ℃, and the working pressure is less than 1.6 MPa; the working temperature of the primary heating device is less than 260 ℃, and the working pressure is less than 1.6 MPa; the working temperature of the separation device is less than 150 ℃, and the working pressure is less than-0.099 MPa; the working temperature of the circulating device is less than 150 ℃, and the working pressure is less than 1.6 MPa; the working temperature of the three-effect discharging device, the two-effect discharging device and the one-effect discharging device is less than 150 ℃, and the working pressure is less than 1.6 MPa.

Further, a feed inlet of the preheating device is connected with an outlet of the raw material liquid pipeline, and a discharge outlet of the preheating device is connected with a first feed inlet of the three-effect separation device; a first discharge port of the three-effect separation device is connected with a feed port of the three-effect discharge device, and a second discharge port of the three-effect separation device is connected with a feed port of the three-effect circulation device; the discharge hole of the three-effect circulating device is connected with the feed inlet of the three-effect heating device; the discharge hole of the three-effect heating device is connected with the second feed inlet of the three-effect separation device;

the discharge hole of the three-effect discharge device is connected with the first feed hole of the two-effect separation device; a first discharge port of the two-effect separation device is connected with a feed port of the two-effect discharge device, a second discharge port of the two-effect separation device is connected with a feed port of the two-effect circulation device, and a steam outlet of the two-effect separation device is connected with a steam inlet of the three-effect heating device; the discharge hole of the double-effect circulating device is connected with the feed inlet of the double-effect heating device; the discharge hole of the two-effect heating device is connected with the second feed inlet of the two-effect separation device;

the discharge hole of the secondary effect discharge device is connected with the first feed hole of the primary effect separation device; the first discharge port of the first-effect separation device is connected with the feed inlet of the first-effect discharge device, the second discharge port of the first-effect separation device is connected with the feed inlet of the first-effect circulation device, and the steam outlet of the first-effect separation device is connected with the steam inlet of the second-effect heating device; the discharge hole of the first-effect circulating device is connected with the feed inlet of the first-effect heating device; the discharge hole of the first effect heating device is connected with the second feed inlet of the first effect separation device.

Further, the preheating device is a preheater; the three-effect heating device, the two-effect heating device and the one-effect heating device are all circulating heaters; the three-effect circulating device, the two-effect circulating device and the one-effect circulating device are circulating pumps; the three-effect separation device, the two-effect separation device and the one-effect separation device are all separators.

Further, the evaporation concentration system also comprises a tail treatment system; the tail treatment system is connected with a three-effect countercurrent evaporation system; the tail treatment system comprises a first water storage device, a circulating water device, a surface condensing device and a sewage treatment system which are connected in sequence.

Further, the tail treatment system also comprises a vacuum pump and a water cooling tower arranged on the first water storage device; the vacuum pump is connected with the surface condensing device. Wherein the water cooling tower is made of glass fiber reinforced plastic, the working temperature is less than 80 ℃, the working pressure is normal pressure, the working temperature of the vacuum pump is a large fan or a mechanical pump vacuum pump is less than 80 ℃, and the working pressure is less than-0.099 MPa.

Furthermore, a first water inlet of the first water storage device is connected with a tap water pipe, a water outlet of the first water storage device is connected with a water inlet of the circulating water device, and a second water inlet of the first water storage device is connected with a water outlet of the surface condensing device; the water outlet of the circulating water device is connected with the water inlet of the surface condensing device; the steam inlet of the surface condensing device is connected with the steam outlet of the three-effect separation device; the wastewater inlet of the sewage treatment system is connected with the wastewater outlet of the surface condensing device, the condensed water outlet of the three-effect heating device and the condensed water outlet of the two-effect heating device; an air outlet is formed in the top end of a wastewater outlet of the surface condensing device; the air outlet is connected with the air inlet of the vacuum pump.

Further, the first water storage device is a water pool; the circulating water device is a circulating water pump; the surface condensing device is a surface condenser.

Further, the water pool is made of acid-resistant anticorrosive cement or glass fiber reinforced plastic; the surface condenser is made of graphite, hastelloy or titanium. Wherein the working temperature of the water pool is less than 80 ℃, the working pressure is normal pressure, the working temperature of the surface condenser is less than 150 ℃, and the working pressure is less than 1.6 MPa.

Further, the evaporation concentration system also comprises a material storage device; and the storage devices are connected with a triple-effect countercurrent evaporation system and a vacuum cooling and drying system.

Further, the feed inlet of the storage device is connected with the discharge outlet of an effective discharge device.

Further, the storage device is a heat preservation storage tank.

Further, the heat-preservation storage tank is made of glass fiber reinforced plastic, hastelloy or titanium materials. Wherein, the working temperature of the heat preservation storage tank is less than 140 ℃, and the working pressure is normal pressure.

Further, the system also comprises a natural gas heat transfer oil system; the natural gas heat conduction oil system comprises a high-temperature heat conduction oil area and a low-temperature heat conduction oil area; the high-temperature heat conduction oil area is connected with a heat conduction oil inlet end of the first-effect unit; the low-temperature heat conduction oil area is connected with a heat conduction oil outlet end of the preheating device, a heat conduction oil outlet end of the first effect unit and a heat conduction oil outlet end of the storage device.

Further, a heat conduction oil outlet of the high-temperature heat conduction oil area is connected with a heat conduction oil inlet of the first-effect heating device; the heat conduction oil outlet of the primary heating device is connected with the heat conduction oil inlet of the preheating device and the heat conduction oil inlet of the storage device; and the heat conduction oil inlet of the low-temperature heat conduction oil area is connected with the heat conduction oil outlet of the preheating device, the heat conduction oil outlet of the one-effect heating device and the heat conduction oil outlet of the storage device.

Further, the natural gas heat conduction oil system is a natural gas heat conduction oil boiler. Wherein, the natural gas heat conduction oil boiler is adopted to replace the original coal-fired boiler, thereby reducing the discharge amount of pollution factors and simultaneously reducing the treatment cost of polluted gas.

Further, the vacuum cooling and drying system comprises a filtering device, a feeding device, a tube array heating device and a vacuum drying device which are connected in sequence; the vacuum cooling drying system also comprises a tailing processing system; the tailing processing system comprises a cyclone separation device, a mixing and condensing device, an injection device and a second water storage device which are connected in sequence; the second water storage device and the mixed condensing device.

Further, the feeding device is made of polytetrafluoroethylene, hastelloy or a titanium material; the tube nest heating device is made of hastelloy or titanium materials. Wherein the working temperature of the feeding device is less than 140 ℃, the working pressure is less than 1.6MPa, the working temperature of the tube array heating device is less than 180 ℃, and the working pressure is less than 1.6 MPa.

Further, a feed inlet of the filtering device is connected with a discharge outlet of the storage device, and a discharge outlet of the filtering device is connected with a feed inlet of the feeding device; the discharge hole of the feeding device is connected with the feed inlet of the tube array heating device; and the discharge hole of the tube array heating device is connected with the feed inlet of the vacuum drying device.

Furthermore, a heat conduction oil inlet of the tube array heating device is connected with a heat conduction oil outlet of the high-temperature heat conduction oil area, and a heat conduction oil outlet of the tube array heating device is connected with a heat conduction oil inlet of the storage device.

Further, the filtering device is a filter; the feeding device is a feeding gear pump; the tube array heating device is a tube array heater; the vacuum drying device is a rotary scraper vacuum dryer.

Further, a powder remover is arranged in the vacuum drying device; the vacuum degree in the vacuum drying device is between-0.092 MPa and-0.085 MPa; the feeding amount of the vacuum drying device is 6.5-7.5T/h.

The vacuum drying device is mainly made of hastelloy or a titanium material, the working temperature of the vacuum drying device is less than 100 ℃, the vacuum drying device cannot adopt carbon steel, the service life of the vacuum drying device can be shortened due to certain corrosivity, and the powder remover can effectively reduce powder brought out by vacuum airflow. If the feeding amount of the rotary scraper vacuum dryer is less than 6.5T/h, a tube array heating device connected with the vacuum drying device is blocked, and if the feeding amount is more than 7.5T/h, the drying effect of the vacuum drying device is reduced.

Further, the tailing processing system also comprises a first circulating water device, a second circulating water device and a third circulating water device; the first circulating water devices are connected with the spraying device and the second water storage device; the second circulating water devices are connected with the second water storage device and the sewage treatment system; and the third circulating water devices are connected with the mixed condensing device and the second water storage device.

Further, a gas discharge hole of the vacuum drying device is connected with a feed hole of the cyclone separation device; the gas discharge hole of the cyclone separation device is connected with the feed inlet of the mixing and condensing device; the air outlet of the mixing and condensing device is connected with the air inlet of the injection device; the first water inlet of the second water storage device is connected with a tap water pipeline, the first water outlet of the second water storage device is connected with the water inlet of the first circulating water device, the second water outlet of the second water storage device is connected with the water inlet of the second circulating water device, and the third water outlet of the second water storage device is connected with the water inlet of the third circulating water device; the water outlet of the first circulating water device is connected with the water inlet of the spraying device; the water outlet of the spraying device is connected with the second water inlet of the second water storage device; the water outlet of the second circulating water device is connected with the wastewater inlet of the sewage treatment system; the water outlet of the third circulating water device is connected with the water inlet of the mixed condensing device; and the water outlet of the mixing and condensing device is connected with the third water inlet of the second water storage device.

Further, the cyclone separation device is a cyclone separator; the mixed condensing device is an atmospheric condenser; the spraying device is a water spraying vacuum pump; the second water storage device is a water tank.

Further, the cyclone separator is made of glass fiber reinforced plastic, hastelloy or titanium material; the atmospheric condenser is made of glass fiber reinforced plastic, polytetrafluoroethylene, Hastelloy or titanium material; the water jet vacuum pump is made of glass fiber reinforced plastic. Wherein the working temperature of the cyclone separator is less than 80 ℃, and the working pressure is less than-0.099 MPa; the working temperature of the atmospheric condenser is less than 80 ℃, and the working pressure is less than-0.099 Mpa; the working temperature of the vacuum pump is less than 80 ℃, and the working pressure is less than-0.099 MPa.

Further, a water cooling tower is arranged on the second water storage device. Wherein the water cooling tower is made of glass fiber reinforced plastic.

Further, a solid discharge port of the vacuum drying device is provided with a double-screw block discharging machine.

Further, the double-screw block discharging machine is made of hastelloy or a titanium material. Wherein the working temperature of the double-screw block discharging machine is less than 100 ℃, and the working pressure is less than 3 MPa.

Further, a condensed water system is arranged at a solid discharge port of the vacuum drying device; and a water inlet of the condensed water system is connected with a tap water pipeline, and a water outlet of the condensed water system is connected with a third water inlet of the second water storage device.

Further, the flash evaporation drying system comprises an air blowing device, an air heating device, a flash evaporation device, a first cyclone separation device, a second cyclone separation device, an air inducing device and a washing device which are sequentially connected.

Further, an air inlet of the air blowing device is connected with air, and an air outlet of the air blowing device is connected with an air inlet of the air heating device; the air outlet of the air heating device is connected with the air inlet of the flash evaporation device; the feed inlet of the flash evaporation device is connected with the solid discharge outlet of the vacuum cooling and drying system, and the discharge outlet of the flash evaporation device is connected with the feed inlet of the first cyclone separation device; a second discharge hole of the first cyclone separation device is connected with a feed inlet of the second cyclone separation device; the air outlet of the second cyclone separation device is connected with the air inlet of the induced draft device; and the air outlet of the induced draft device is connected with the air inlet of the washing device.

Further, a first discharge hole of the first cyclone separation device is a powder product outlet; and a discharge hole of the second cyclone separation device is an outlet of a product in the powder industry.

Further, the air blowing device is an air blower; the air heating device is an air heater; the flash evaporation device is a flash evaporation tower; the first cyclone separation device and the second cyclone separation device are both cyclone separators; the induced draft device is an induced draft fan; the washing device is a spray washing tower.

Further, the washing device also comprises an exhaust device and a fourth circulating water device which are arranged at the top of the washing device; the water inlet of the fourth circulating water device is connected with a tap water pipeline and the water outlet of the washing device, and the water outlet of the fourth circulating water device is connected with the first water inlet and the second water inlet of the washing device; and the material at the discharge port of the washing device is recycled.

The invention has the beneficial effects that:

1) the evaporation concentration system designed by the invention can improve the solid content of the polyaluminum chloride aqueous solution from 30-35% to 60-65%, has the advantages of high treatment efficiency and low cost, and effectively improves the subsequent treatment efficiency;

2) the vacuum cooling and drying system designed by the invention can produce the polyaluminum chloride aqueous solution with the solid content of 60-65% into blocky polyaluminum chloride with the solid content of 72-77%, and the whole process has no waste gas and waste water discharge, and has the advantages of high production efficiency, safety and environmental protection;

3) by the evaporation concentration system, the vacuum cooling and drying system and the flash evaporation drying system designed by the invention, the polyaluminum chloride aqueous solution with the solid content of 30-35% can be produced into the powdery polyaluminum chloride with the solid content of more than 91-94%, the automatic and clean production is really realized, the quality index of the produced polyaluminum chloride product reaches the national standard requirements of new polyaluminum chloride with high alumina content, high basicity value, low water insoluble substance value and low heavy metal value, and the advantages of product diversification, low energy consumption and high productivity are realized.

Drawings

FIG. 1 is a flow chart of an evaporative concentration process designed by the present invention;

FIG. 2 is a flow chart of the vacuum cooling drying process designed by the present invention;

fig. 3 is a flow chart of a flash drying process designed by the invention.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.