阅读说明：本技术 一种液体蒸发浓缩干化一体处理方法 (Liquid evaporation, concentration and drying integrated treatment method ) 是由 范栋 于 2020-05-19 设计创作，主要内容包括：本发明专利涉及液体处理技术领域,特别是一种液体蒸发浓缩干化一体处理方法。该处理方法包括以下步骤：将原液泵入蒸发器中,通过对蒸发器内的换热器送入高温蒸汽,使原液升温,且蒸发浓缩；原液在蒸发器罐内蒸发浓缩形成浓缩液,流入蒸发器底部的热井；热井中的浓缩液与来液混合泵回蒸发器,再度蒸发浓缩,并且不断进行循环蒸发；浓缩液到一定浓度泵入干化器,干化器使浓缩液蒸发干化,直至完全脱水形成固化物而排出设备外。该处理方法由于采用干化器替代离心机等设备,解决了设备故障率高,需频繁清理以及浓缩液母液回流蒸发器后因沸点高而造成设备异常的问题,适用于高盐分高有机物的液体全量化处理,具有适用于大规模应用的特点。(The invention relates to the technical field of liquid treatment, in particular to an integrated treatment method for evaporation, concentration and drying of liquid. The processing method comprises the following steps: pumping the stock solution into an evaporator, feeding high-temperature steam into a heat exchanger in the evaporator to heat the stock solution, and evaporating and concentrating the stock solution; evaporating and concentrating the stock solution in an evaporator tank to form a concentrated solution, and flowing into a hot well at the bottom of the evaporator; mixing the concentrated solution in the hot well with the incoming liquid, pumping the mixture back to the evaporator, evaporating and concentrating again, and continuously performing circulating evaporation; pumping the concentrated solution into a drier at a certain concentration, evaporating and drying the concentrated solution by the drier until the concentrated solution is completely dehydrated to form a cured substance, and discharging the cured substance out of the equipment. The treatment method adopts the drier to replace equipment such as a centrifugal machine, solves the problems of high equipment failure rate, frequent cleaning and equipment abnormality caused by high boiling point after concentrated solution mother liquor flows back to the evaporator, is suitable for liquid full-scale treatment of high-salinity high-organic matters, and has the characteristic of being suitable for large-scale application.)

1. A liquid evaporation, concentration and drying integrated treatment method is characterized by comprising the following steps:

the method comprises the following steps: pumping the stock solution into an evaporator through a feed pump, feeding high-temperature steam into a heat exchanger in the evaporator, heating the stock solution by the evaporator, and evaporating and concentrating;

step two: evaporating and concentrating the stock solution in an evaporator to form a concentrated solution, performing heat exchange and evaporation concentration through a heat exchanger in the evaporator, and enabling the concentrated solution to flow into a hot well at the bottom of the evaporator;

step three: mixing the concentrated solution in the hot well with the stock solution, pumping the mixture back to the evaporator through a circulating pump, evaporating and concentrating again, and continuously circularly evaporating;

step four: and pumping the concentrated solution to a drier by a concentrated solution pump after the concentrated solution reaches a target concentration, feeding high-temperature steam into a heat exchanger in the drier, and evaporating and drying the concentrated solution by the drier until the concentrated solution is completely dehydrated to form a cured substance and the cured substance is discharged out of the equipment.

2. The integrated treatment method for evaporation, concentration and drying of liquid according to claim 1, characterized in that: in the first step, the stock solution is pumped into the evaporator and then sprayed on the heat exchange plate pipe through the spraying pipeline, high-temperature steam flows into the heat exchange channel in the heat exchange plate pipe, and the stock solution contacts the pipe wall of the heat exchange plate pipe to exchange heat with the high-temperature steam in the plate pipe, so that the liquid is heated and evaporated and concentrated.

3. The integrated treatment method for evaporation, concentration and drying of liquid according to claim 1, characterized in that: and in the first step and the fourth step, distilled water is generated when the evaporator evaporates the stock solution and the drier dries the concentrated solution, the distilled water is pumped into the heat exchanger through the distilled water pump, the distilled water exchanges heat with the stock solution in the heat exchanger, and the stock solution is pumped into the evaporator through the feeding pump after being heated.

4. The integrated treatment method for evaporation, concentration and drying of liquid according to claim 1, characterized in that: in the first step and the fourth step, secondary steam is generated when the evaporator evaporates the stock solution and the drier dries the concentrated solution, flows into the steam compressor to be compressed and heated, and is pumped back to the evaporator and the drier again.

5. The integrated treatment method for evaporation, concentration and drying of liquid according to claim 1, characterized in that: in the first step, the evaporator uses high-temperature steam or external fresh steam generated by the steam generating tank as a preheating heat source to exchange heat with the stock solution, so that the stock solution is heated and evaporated and concentrated.

6. The integrated treatment method for evaporation, concentration and drying of liquid according to claim 1, characterized in that: and in the fourth step, the concentration of the liquid reaches the target concentration after the liquid is circularly evaporated and concentrated, the concentrated solution valve is opened, and the concentrated solution is pumped into the drier through the concentrated solution pump.

7. The integrated treatment method for evaporation, concentration and drying of liquid according to claim 1, characterized in that: in the fourth step, the high-temperature steam flows into the heat exchange plate pipe in the drier equipment, and the high-temperature steam exchanges heat with the concentrated solution outside the heat exchange plate pipe, so that the concentrated solution is evaporated and dried to form a cured substance.

8. The integrated treatment method of evaporation, concentration and drying of liquid according to any one of claims 1, 4 or 5, characterized in that: after the steam generating tank or the external fresh steam works for a period of time, the steam generating tank stops generating the steam, the steam compressor starts to work, and high-temperature steam is continuously provided for the evaporator and the drier.

Technical Field

The invention relates to the technical field of liquid treatment, in particular to an integrated treatment method for evaporation, concentration and drying of liquid.

Background

The mechanical vapor recompression treatment technology is gradually applied to domestic liquid treatment engineering, a vapor compressor is generally adopted to recompress and heat secondary vapor generated by an evaporator, so that the secondary vapor becomes a regenerative heat source to circularly carry out heat transfer and evaporation on stock solution in the evaporator, the water content of the stock solution is reduced, the stock solution enters equipment such as a thickener and the like for sedimentation and dehydration after being concentrated, and then enters a centrifuge for solid-liquid separation, so that solid materials are separated from the stock solution.

In particular, in the process of sewage treatment, because the sewage is complex in type, after a sewage stock solution is subjected to sedimentation and dehydration by equipment such as an evaporator and a thickener, the content of organic matters and salt in the stock solution is high, the stock solution becomes viscous, the fluidity of the viscous high-concentration concentrate is poor, the influence on the work of a centrifugal machine and the like is large, a filter screen of the centrifugal machine is often blocked, or the inside of the centrifugal machine is hardened and scaled, the separation work of the centrifugal machine is influenced, and the centrifugal machine must be frequently stopped and manually cleaned. In addition, after the concentrated solution is subjected to solid-liquid separation by a centrifuge, the mother solution needs to flow back to the evaporator for re-evaporation and concentration, but the evaporation efficiency of the equipment is reduced due to the fact that the mother solution contains residual high-boiling-point liquid, and the high-boiling-point liquid is continuously accumulated due to continuous backflow, so that the equipment cannot normally operate, and the water content of the solid is very high.

Disclosure of Invention

In order to solve the defects of the prior art, the invention discloses an integrated treatment method for evaporating, concentrating and drying liquid.

The technical scheme adopted by the invention for solving the technical problems is as follows: a liquid evaporation, concentration and drying integrated treatment method comprises the following steps:

the method comprises the following steps: pumping the stock solution into an evaporator through a feed pump, feeding high-temperature steam into a heat exchanger in the evaporator, heating the stock solution by the evaporator, and evaporating and concentrating;

step two: evaporating and concentrating the stock solution in an evaporator to form a concentrated solution, performing heat exchange and evaporation concentration through a heat exchanger in the evaporator, and enabling the concentrated solution to flow into a hot well at the bottom of the evaporator;

step three: mixing the concentrated solution in the hot well with the stock solution, pumping the mixture back to the evaporator through a circulating pump, evaporating and concentrating again, and continuously circularly evaporating;

step four: and pumping the concentrated solution to a drier by a concentrated solution pump after the concentrated solution reaches a target concentration, feeding high-temperature steam into a heat exchanger in the drier, and evaporating and drying the concentrated solution by the drier until the concentrated solution is completely dehydrated to form a cured substance and the cured substance is discharged out of the equipment.

Further, in the first step, after the stock solution is pumped into the evaporator, the stock solution is sprayed on the heat exchange plate pipe through the spraying pipeline, the high-temperature steam flows into the heat exchange channel in the heat exchange plate pipe, and the stock solution contacts with the pipe wall of the heat exchange plate pipe to exchange heat with the high-temperature steam in the plate pipe, so that the liquid is heated and evaporated and concentrated.

Further, in the first step and the fourth step, when the evaporator evaporates the stock solution and the drier dries the concentrated solution, distilled water is generated, the distilled water is pumped into the heat exchanger through the distilled water pump, the distilled water exchanges heat with the stock solution in the heat exchanger, and the stock solution is pumped into the evaporator through the feeding pump after being heated.

Further, in the first step and the fourth step, secondary steam is generated when the evaporator evaporates the stock solution and the drier dries the concentrated solution, flows into the steam compressor to be compressed and heated, and is pumped back to the evaporator and the drier.

Further, in the first step, the evaporator uses high-temperature steam or external fresh steam generated by the steam generating tank as a preheating heat source to exchange heat with the stock solution, so that the stock solution is heated and evaporated and concentrated.

Further, in the fourth step, after the concentrated solution is circularly evaporated and concentrated, the concentration reaches the target concentration, the concentrated solution valve is opened, and the concentrated solution is pumped into the drier through the concentrated solution pump.

Further, in the fourth step, the high-temperature steam flows into a heat exchange plate pipe in the drier equipment, and the high-temperature steam exchanges heat with the concentrated solution outside the heat exchange plate pipe, so that the concentrated solution is evaporated and dried to form a cured substance.

Furthermore, after the steam generating tank or the external fresh steam works for a period of time, the steam generation is stopped, the steam compressor starts to work, and high-temperature steam is continuously provided for the evaporator and the drier.

Compared with the prior art, the invention has the beneficial effects that:

1: according to the integrated treatment method for liquid evaporation, concentration and drying, provided by the invention, the drier is adopted to replace equipment such as a centrifugal machine and the like, and the drier dries the concentrated solution to directly dry the concentrated solution to form a solidified substance to be discharged, so that the integrated treatment method for liquid evaporation, concentration and drying solves the problems that the equipment has high failure rate and needs to be cleaned frequently, and the equipment is abnormal due to high boiling point after the concentrated solution mother solution flows back to the evaporator, and the water content of the solid is low.

2: according to the integrated treatment method for liquid evaporation concentration and drying, the low-energy consumption device for evaporation drying of the concentrated solution is utilized by the method, the interior of the device is not easy to form plates, scale and block, and the integrated treatment method is suitable for treating liquids with high salinity and high organic matters and has the characteristic of being suitable for large-scale application.

3: according to the integrated treatment method for evaporation, concentration and drying of the liquid, provided by the invention, the original liquid is continuously and circularly evaporated in the evaporator by using the circulating pump to form the concentrated solution with higher concentration, so that the subsequent drying is more sufficient, and the drying efficiency is improved.

4: according to the integrated treatment method for evaporation, concentration and drying of the liquid, provided by the invention, as the secondary steam is used as the heat source of the evaporator and the dryer by using the steam compressor, the heat energy is recycled, and the requirement on external energy is reduced, so that the effects of energy conservation and environmental protection are achieved.

5: according to the integrated treatment method for evaporation, concentration and drying of the liquid, provided by the invention, the heat exchanger is used for carrying out heat exchange between the distilled water and the stock solution, the temperature of the stock solution is increased, and the stock solution enters the evaporator to reach an evaporation condition more quickly, so that the working energy consumption is reduced, and the energy is saved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Detailed Description

The invention will now be further described with reference to the accompanying description and examples:

a liquid evaporation, concentration and drying integrated treatment method comprises the following steps:

the method comprises the following steps: pumping the stock solution into a pump 14 through a feed pump 34, feeding high-temperature steam into a heat exchanger in an evaporator 12, heating the stock solution by the evaporator 12, and evaporating and concentrating;

step two: the stock solution is evaporated and concentrated in the evaporator 12 to form a concentrated solution, the concentrated solution is evaporated and concentrated by a heat exchanger in the evaporator 12, and the concentrated solution flows into a hot well 14 at the bottom of the evaporator;

step three: the concentrated solution in the hot well 14 is mixed with the stock solution and pumped back to the evaporator through the circulating pump 42, evaporated and concentrated again, and continuously evaporated in a circulating way;

step four: the concentrated solution is pumped into a drier 43 by a concentrated solution pump 41, high-temperature steam is sent into a heat exchanger in the drier 43, and the drier 43 evaporates and dries the concentrated solution until the concentrated solution is completely dehydrated to form a cured substance and the cured substance is discharged out of the equipment.

More preferably, in the first step, after the raw liquid is pumped into the evaporator 12, the raw liquid is sprayed onto the heat exchange plate tubes through the spraying pipes, the high-temperature steam flows into the heat exchange pipes in the heat exchange plate tubes, and the raw liquid contacts the heat exchange plates to exchange heat with the high-temperature steam, so that the raw liquid is heated and evaporated and concentrated.

More preferably, in the first step and the fourth step, the evaporator 12 evaporates the raw liquid and the drier 43 dries the concentrated liquid to generate distilled water, the distilled water is pumped into the heat exchanger 33 through the distilled water pump 32, the distilled water exchanges heat with the raw liquid in the heat exchanger 33, and the raw liquid is pumped into the evaporator through the feeding pump 34 after being heated.

More preferably, in the first step and the fourth step, secondary steam is generated when the evaporator 12 evaporates the raw liquid and the drier 43 dries the concentrated liquid, and the secondary steam flows into the steam compressor 51 to be compressed and heated, and is pumped back to the evaporator 12 and the drier 43 again.

More preferably, in the first step, the evaporator 12 uses the high-temperature steam or the external fresh steam generated by the steam generating tank 11 as a preheating heat source to exchange heat with the stock solution, so as to heat the stock solution and evaporate and concentrate the same.

More preferably, in the fourth step, after the concentrated solution is circularly evaporated and concentrated, the concentration reaches the target concentration, the concentrated solution valve 63 is opened, and the concentrated solution is pumped into the dryer 43 through the concentrated solution pump 41.

More preferably, in the fourth step, the high-temperature steam flows into the heat exchange plate tube inside the dryer 43, and the high-temperature steam exchanges heat with the concentrated solution outside the heat exchange plate tube, so that the concentrated solution is evaporated and dried to form a cured product.

More preferably, after the steam generating tank 11 or the external fresh steam is operated for a period of time, the generation of steam or the supplement of trace steam is stopped, the steam compressor 51 is started to operate, and high-temperature steam is continuously provided for the heat exchange plate pipes of the evaporator 12 and the heat exchange plate pipes of the dryer 43.