Device and method for recycling waste steam in cotton pulp production
阅读说明：本技术 一种棉浆生产废汽回收利用的装置及方法 (Device and method for recycling waste steam in cotton pulp production ) 是由 高家豪 王彦波 冉静平 余永红 侯小军 王超 王多寿 于 2020-05-21 设计创作，主要内容包括：本发明公开一种棉浆生产废汽回收利用的装置,包括喷放罐组、吸收塔、闪蒸罐、废液处理设备和尾气处理设备,喷放罐组具有蒸汽进口和蒸汽出口,喷放罐组底部具有废液出口,蒸汽进口与蒸球连通,蒸汽出口与吸收塔连通,废液出口与废液处理设备连通,吸收塔具有第一混合液出口和第二混合液出口,第一混合液出口与闪蒸罐连通,第二混合液出口与废液处理设备连通,闪蒸罐具有闪蒸汽出口,闪蒸汽出口与黑液蒸发站连通,黑液蒸发站的加热室的出口端和尾气出口均与尾气处理设备连通。本发明提供的棉浆生产废汽回收利用的装置及方法,充分利用蒸球废汽中的资源和热能,减少蒸球废汽对环境的污染,提高原材料和能源的利用率,且不会堵塞管路,影响产能。(The invention discloses a device for recycling waste steam in cotton pulp production, which comprises a spraying tank group, an absorption tower, a flash tank, waste liquid treatment equipment and tail gas treatment equipment, wherein the spraying tank group is provided with a steam inlet and a steam outlet, the bottom of the spraying tank group is provided with the waste liquid outlet, the steam inlet is communicated with a rotary spherical digester, the steam outlet is communicated with the absorption tower, the waste liquid outlet is communicated with the waste liquid treatment equipment, the absorption tower is provided with a first mixed liquid outlet and a second mixed liquid outlet, the first mixed liquid outlet is communicated with the flash tank, the second mixed liquid outlet is communicated with the waste liquid treatment equipment, the flash tank is provided with a flash steam outlet, the flash steam outlet is communicated with a black liquid evaporation station, and the outlet end of a heating chamber of the black liquid evaporation station and the tail gas. The device and the method for recycling the cotton pulp production waste steam provided by the invention fully utilize resources and heat energy in the rotary spherical digester waste steam, reduce the pollution of the rotary spherical digester waste steam to the environment, improve the utilization rate of raw materials and energy, and cannot block pipelines and influence the productivity.)
1. The utility model provides a cotton thick liquid production exhaust steam recycle's device which characterized in that: the device comprises a spraying tank group (2), an absorption tower, a flash tank, waste liquid treatment equipment and tail gas treatment equipment, wherein a steam inlet (211) and a steam outlet (221) are arranged at the top of the spraying tank group (2), a waste liquid outlet is arranged at the bottom of the spraying tank group (2), the steam inlet (211) is communicated with a steam outlet of a rotary spherical digester (1), the steam outlet (221) is communicated with an air inlet end of the absorption tower, the waste liquid outlet is communicated with a liquid inlet end of the waste liquid treatment equipment, a first mixed liquid outlet and a second mixed liquid outlet are arranged at the lower part of the absorption tower, the first mixed liquid outlet is communicated with the liquid inlet end of the flash tank, the second mixed liquid outlet is communicated with the waste liquid treatment equipment, a valve is arranged between the second mixed liquid outlet and the waste liquid treatment equipment, the flash tank is provided with the flash steam outlet (221), and the black liquor of a heating chamber of an inlet end evaporation station are communicated with the flash steam outlet, the evaporation chamber of the black liquor evaporation station is provided with a tail gas outlet, and the outlet end of the heating chamber of the black liquor evaporation station and the tail gas outlet are both communicated with the tail gas treatment equipment;
the spraying and discharging tank group (2) is used for discharging fiber waste liquid in the waste steam of the rotary spherical digester (1) discharged by the rotary spherical digester (1);
the absorption tower is used for condensing the high-temperature waste steam entering the absorption tower and absorbing and storing the heat of the high-temperature waste steam entering the absorption tower;
the flash tank is used for flash evaporation of liquid entering the flash tank to generate flash steam for supplying heat to the black liquor evaporation station.
2. The cotton pulp production waste steam recycling device according to claim 1, characterized in that: and the top of the absorption tower is provided with a non-condensed steam outlet which is communicated with the inlet end of the heating chamber of the black liquor evaporation station.
3. The cotton pulp production waste steam recycling device according to claim 1, characterized in that: the flash tank is provided with a flash liquid outlet which is communicated with the top of the absorption tower, a temperature regulating liquid pump is arranged between the flash liquid outlet and the absorption tower, and the temperature regulating liquid pump is used for pumping the flash liquid into the top of the absorption tower.
4. The cotton pulp production waste steam recycling device according to claim 3, characterized in that: a buffer tank is arranged between the temperature adjusting liquid pump and the flash tank, and a reflux pump is arranged between the buffer tank and the flash tank.
5. The cotton pulp production waste steam recycling device according to claim 1, characterized in that: the black liquor evaporation station is provided with a black liquor evaporator and a surface condenser, a heating chamber and an evaporation chamber of the black liquor evaporator are the heating chamber and the evaporation chamber of the black liquor evaporation station, an outlet end of the heating chamber of the black liquor evaporator is communicated with an inlet end of the surface condenser, an outlet end of the surface condenser is communicated with the tail gas treatment equipment, a tail gas outlet is communicated with an outlet end of the surface condenser, the surface condenser is also provided with a sewage condensate outlet, and the sewage condensate outlet is communicated with the lower part of the absorption tower.
6. The cotton pulp production waste steam recycling device according to claim 1, characterized in that: spout and put a jar group (2) and put jar (22) including first spout and put jar (21) and second spout, steam inlet (211) set up in first spout puts jar (21) top, steam outlet (221) set up in the second spouts puts jar (22) top, first spout put jar (21) top still has first steam passing hole (212), the second is spouted and is put jar (22) top and still has second steam passing hole (222), first steam passing hole (212) with steam passing hole (222) intercommunication is crossed to the second, first spout put jar (21) with second spout and put jar (22) bottom all has the waste liquid outlet, first spout put jar (21) with second spout the waste liquid outlet of putting jar (22) bottom all with waste liquid treatment device intercommunication.
7. The cotton pulp production waste steam recycling device according to claim 1, characterized in that: the waste liquid treatment equipment comprises a micro-filter (31), a black liquid filter (33), a dilute black liquid tank (34), a pulper (35) and a pulp extruding machine (36), wherein a waste liquid outlet is communicated with a liquid inlet end of the micro-filter (31), the micro-filter (31) is provided with a fiber outlet and a black liquid outlet, the fiber outlet is communicated with a liquid inlet end of the pulper (35), a discharge end of the pulper (35) is communicated with a liquid inlet end of the pulp extruding machine (36), a discharge end of the pulp extruding machine (36) is communicated with a liquid inlet end of a steaming ball (1), the black liquid outlet is communicated with a liquid inlet end of the black liquid filter (33), a liquid outlet end of the black liquid filter (33) is communicated with the dilute black liquid tank (34), and a second mixed liquid outlet is communicated with the dilute black liquid tank (34).
8. The cotton pulp production waste steam recycling device according to claim 7, characterized in that: a black liquor recovery tank (32) is arranged between the black liquor outlet and the black liquor filter (33), the black liquor outlet is communicated with the upper inner cavity of the black liquor recovery tank (32), and the liquid inlet end of the black liquor filter (33) is communicated with the lower inner cavity of the black liquor recovery tank (32).
9. The apparatus for recycling exhaust gas from cotton pulp production according to any one of claims 1 to 8, wherein: the tail gas treatment equipment comprises a washing tank and a burner, wherein the outlet end of a heating chamber of the black liquor evaporation station and the tail gas outlet are both communicated with the inlet end of the washing tank, and the outlet end of the washing tank is communicated with the burner.
10. A method for recycling waste steam in cotton pulp production is characterized by comprising the following steps: an apparatus for recycling exhaust gas from cotton pulp production as claimed in any one of claims 1 to 9, comprising the steps of:
separating the waste steam of the rotary spherical digester (1) discharged by the rotary spherical digester (1) into fiber waste liquid and high-temperature waste steam;
the high-temperature waste steam enters the absorption tower and is condensed into condensed liquid;
carrying out flash evaporation on the condensed liquid to generate flash steam, wherein the flash steam enters a heating chamber of the black liquor evaporation station to supply heat to the black liquor evaporation station;
and recycling the fiber waste liquid.
Technical Field
The invention relates to the field of cotton pulp production, in particular to a device and a method for recycling waste steam in cotton pulp production.
Background
In the production process of cotton pulp, a rotary spherical digester is usually used as intermittent cooking equipment, the rotary spherical digester is cooked by a direct steam-through method and runs periodically, after the cotton pulp in the rotary spherical digester reaches a preset index, waste steam and fiber waste residues in the rotary spherical digester are directly discharged into the atmosphere through a steam discharge port, a large amount of heat energy is wasted, and air is polluted.
Disclosure of Invention
The invention aims to provide a device and a method for recycling waste steam in cotton pulp production, which fully utilize resources and heat energy in the waste steam of a rotary spherical digester, reduce the pollution of the waste steam of the rotary spherical digester to the environment, improve the utilization rate of raw materials and energy, and can not block pipelines and influence the productivity.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention discloses a device for recycling waste steam in cotton pulp production, which comprises a spraying tank group, an absorption tower, a flash tank, waste liquid treatment equipment and tail gas treatment equipment, wherein the top of the spraying tank group is provided with a steam inlet and a steam outlet, the bottom of the spraying tank group is provided with a waste liquid outlet, the steam inlet is communicated with a steam outlet of a rotary spherical digester, the steam outlet is communicated with the air inlet end of the absorption tower, the waste liquid outlet is communicated with the liquid inlet end of the waste liquid treatment equipment, the lower part of the absorption tower is provided with a first mixed liquid outlet and a second mixed liquid outlet, the first mixed liquid outlet is communicated with the liquid inlet end of the flash tank, the second mixed liquid outlet is communicated with the waste liquid treatment equipment, a valve is arranged between the second mixed liquid outlet and the waste liquid treatment equipment, the flash tank is provided with a flash steam outlet, and the flash steam outlet is communicated with the inlet end of a heating chamber of an, the evaporation chamber of the black liquor evaporation station is provided with a tail gas outlet, and the outlet end of the heating chamber of the black liquor evaporation station and the tail gas outlet are both communicated with the tail gas treatment equipment;
the spraying tank group is used for discharging fiber waste liquid in the rotary spherical digester waste steam discharged by the rotary spherical digester;
the absorption tower is used for condensing the high-temperature waste steam entering the absorption tower and absorbing and storing the heat of the high-temperature waste steam entering the absorption tower;
the flash tank is used for flash evaporation of liquid entering the flash tank to generate flash steam for supplying heat to the black liquor evaporation station.
The invention has the beneficial effects that: the waste steam of the rotary spherical digester discharged from the steam discharging port of the rotary spherical digester enters the spraying tank group, fiber waste liquid and high-temperature waste steam in the waste steam of the rotary spherical digester are separated in the spraying tank group, the fiber waste liquid enters waste liquid treatment equipment for recycling, the pollution to the environment caused by discharge is avoided, the fiber waste liquid is recycled after being treated, the utilization rate of raw materials is improved, the high-temperature waste steam enters the absorption tower, the high-temperature waste steam is condensed into condensed liquid in the absorption tower, micro negative pressure is formed after the high-temperature waste steam is condensed, the high-temperature waste steam in the spraying tank group is further conveniently sucked into the absorption tower, the condensed liquid enters the flash evaporation tank to generate flash steam, the flash steam enters the black liquor evaporation station to supply heat for the black liquor evaporation station, 3-4 tons of steam supplied to the black liquor evaporation station can be saved every hour, the heat energy of the waste steam of the rotary spherical digester discharged from the rotary spherical digester is fully utilized, the content of the flash steam fibers is low, pipelines cannot be blocked, the capacity is influenced, and the, reducing the pollution to the environment.
Further, the top of the absorption tower is provided with a non-condensed steam outlet which is communicated with the inlet end of the heating chamber of the black liquor evaporation station.
The beneficial effect of adopting the further scheme is that: the high-temperature waste steam can not be completely condensed into condensed liquid in the absorption tower, and the non-condensed steam part in the high-temperature waste steam enters a heating chamber of the black liquor evaporation station through a non-condensed steam outlet to supply heat for the black liquor evaporation station and further recycle the heat.
Further, the flash tank is provided with a flash liquid outlet, the flash liquid outlet is communicated with the top of the absorption tower, a temperature regulating liquid pump is arranged between the flash liquid outlet and the absorption tower, and the temperature regulating liquid pump is used for pumping the flash liquid into the top of the absorption tower.
The beneficial effect of adopting the further scheme is that: the condensed liquid is flashed in the flash tank, flash steam is generated, flash liquid is also generated, the part of flash liquid is used as temperature regulating liquid and is injected back to the top of the absorption tower for condensing high-temperature waste steam entering the absorption tower, and the flash liquid is recycled, so that energy is saved.
Furthermore, a buffer tank is arranged between the temperature adjusting liquid pump and the flash tank, and a reflux pump is arranged between the buffer tank and the flash tank.
The beneficial effect of adopting the further scheme is that: the buffer tank is as the retrieval and utilization device of the temperature regulation liquid after the flash distillation, and the absorption tower is injected into to the rethread temperature regulation liquid pump after flash distillation liquid is buffered and is collected in the buffer tank, avoids the direct absorption tower that supplies of flash distillation liquid to cause the impact to the absorption tower.
Furthermore, the black liquor evaporation station is provided with a black liquor evaporator and a surface condenser, the heating chamber and the evaporation chamber of the black liquor evaporator are the heating chamber and the evaporation chamber of the black liquor evaporation station, the outlet end of the heating chamber of the black liquor evaporator is communicated with the inlet end of the surface condenser, the outlet end of the surface condenser is communicated with the tail gas treatment equipment, the tail gas outlet is communicated with the outlet end of the surface condenser, the surface condenser is also provided with a sewage condensate outlet, and the sewage condensate outlet is communicated with the lower part of the absorption tower.
The beneficial effect of adopting the further scheme is that: after the heat is supplied to the black liquor evaporator by the flash steam and the uncondensed steam through the black liquor evaporator, the flash steam and the uncondensed steam enter the surface condenser to be cooled to form sewage condensate, the sewage condensate is injected into the lower part of the absorption tower to be mixed with the condensate to store and absorb the heat of the high-temperature waste steam, the high-temperature waste steam is fully utilized, resources are saved, and the pollution of the discharge of the sewage condensate to the environment can be avoided.
Further, it puts jar group including first spout put jar and second spout put the jar, steam inlet set up in first spout puts tank deck portion, steam outlet set up in the second spouts puts tank deck portion, first spout put tank deck portion still has first steam passing hole, the second spouts puts tank deck portion still has second steam passing hole, first steam passing hole with second steam passing hole intercommunication, first spout put jar with the second spouts puts tank bottom portion all has waste liquid outlet, first spout put jar with the second spout put tank bottom portion waste liquid outlet all with waste liquid treatment equipment intercommunication.
The beneficial effect of adopting the further scheme is that: the path of high-temperature waste steam and fiber waste liquid separation is prolonged, the separation is more sufficient, only the first spraying tank is punched by the steam ball to release steam, the second spraying tank is punched by the steam ball to release steam, and the separation effect of the high-temperature waste steam and the fiber waste liquid is better.
Further, the waste liquid treatment equipment includes microstrainer, black liquor filter, rare black liquor jar, pulper and pulp grinder, the waste liquid export with the feed liquor end intercommunication of microstrainer, the microstrainer has fibre export and black liquor export, the fibre export with the feed end intercommunication of pulper, the discharge end of pulper with the feed end intercommunication of pulp grinder, the discharge end of pulp grinder with the feed end intercommunication of rotary spherical digester, black liquor export with the feed liquor end intercommunication of black liquor filter, the play liquid end of black liquor filter with rare black liquor jar intercommunication, the mixed liquid export of second with rare black liquor jar intercommunication.
The beneficial effect of adopting the further scheme is that: the microfilter separates the fiber and the black liquor in the fiber waste liquor, the fiber is delivered to a pulp extruder after being crushed in a pulper, the recycled fiber is added into a rotary spherical digester through the pulp extruder and is steamed again, the raw material is saved, the black liquor passes through a black liquor filter and is stored in a thin black liquor tank, and the recycling of the black liquor is completed.
Further, a black liquor recovery tank is arranged between the black liquor outlet and the black liquor filter, the black liquor outlet is communicated with an upper inner cavity of the black liquor recovery tank, and a liquid inlet end of the black liquor filter is communicated with a lower inner cavity of the black liquor recovery tank.
The beneficial effect of adopting the further scheme is that: the black liquor recovery tank can play a role in buffering, and the problem that the filtering efficiency of the black liquor filter is low when the flow of the black liquor flowing out of the black liquor outlet is too large is avoided.
Further, the tail gas treatment equipment comprises a washing tank and a burner, wherein the outlet end of the heating chamber of the black liquor evaporation station and the tail gas outlet are both communicated with the inlet end of the washing tank, and the outlet end of the washing tank is communicated with the burner.
The beneficial effect of adopting the further scheme is that: the washing tank can absorb the water-soluble part in the tail gas, and the burner burns the water-insoluble part in the tail gas, so that the direct emission of the tail gas is avoided to cause environmental pollution.
The method for recycling the waste steam generated in cotton pulp production adopts the device for recycling the waste steam generated in cotton pulp production, and comprises the following steps of:
separating the rotary spherical digester waste steam discharged by the rotary spherical digester into fiber waste liquid and high-temperature waste steam;
the high-temperature waste steam enters the absorption tower and is condensed into condensed liquid;
carrying out flash evaporation on the condensed liquid to generate flash steam, wherein the flash steam enters a heating chamber of the black liquor evaporation station to supply heat to the black liquor evaporation station;
and recycling the fiber waste liquid.
The invention has the beneficial effects that: the fiber waste liquid is recycled, the pollution to the environment caused by emission is avoided, the fiber waste liquid is recycled after being treated, the utilization rate of raw materials is improved, high-temperature waste steam enters an absorption tower, the high-temperature waste steam is condensed into condensate in the absorption tower, the condensate is subjected to flash evaporation to generate flash steam, the flash steam enters a black liquor evaporation station to supply heat to the black liquor evaporation station, 3-4 tons of steam fed to the black liquor evaporation station can be saved in each hour, the heat energy of the waste steam of the rotary spherical digester released by the rotary spherical digester is fully utilized, the fiber content of the flash steam is low, pipelines cannot be blocked, and the capacity is influenced.
Drawings
FIG. 1 is a schematic view of an embodiment of an apparatus for inspecting the recycling of waste vapors from a cotton pulp;
FIG. 2 is a schematic view of the connection of the blow tank set with the waste liquid treatment apparatus and the rotary spherical digester;
in the figure: 1-a rotary spherical digester, 2-a blowing tank group, 21-a first blowing tank, 211-a steam inlet, 212-a first steam passing hole, 22-a second blowing tank, 221-a steam outlet, 222-a second steam passing hole, 31-a micro-filter, 32-a black liquor recovery tank, 33-a black liquor filter, 34-a thin black liquor tank, 35-a pulper and 36-a pulp extruder.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the device for recycling waste steam from cotton pulp production disclosed by the invention comprises a
the
the absorption tower is used for condensing the high-temperature waste steam entering the absorption tower and absorbing and storing the heat of the high-temperature waste steam entering the absorption tower, and the absorption tower can absorb and store the heat by adopting circulating hot water;
the flash tank is used for flash evaporation of liquid entering the flash tank to generate flash steam to supply heat to the black liquor evaporation station, the flash tank can be a three-stage flash tank, the black liquor evaporation station is provided with a three-effect evaporator, a four-effect evaporator and a five-effect evaporator, and the flash steam generated by the three-stage flash tank supplies heat to the three-effect evaporator, the four-effect evaporator and the five-effect evaporator of the black liquor evaporation station respectively.
The black liquor evaporation station is provided with a black liquor evaporator and a surface condenser, a heating chamber and an evaporation chamber of the black liquor evaporator are the heating chamber and the evaporation chamber of the black liquor evaporation station, an outlet end of the heating chamber of the black liquor evaporator is communicated with an inlet end of the surface condenser, an outlet end of the surface condenser is communicated with tail gas treatment equipment, a tail gas outlet is communicated with an outlet end of the surface condenser, the surface condenser is also provided with a sewage condensate outlet which is communicated with the lower part of an absorption tower, and after heat is supplied to the black liquor evaporator by flash steam and non-condensable steam, enters a surface condenser to be cooled into sewage condensate, the sewage condensate enters the lower part of the absorption tower through a sewage condensate outlet, the mixed liquid is mixed with the condensate to form mixed liquid, the sewage condensate can be used as a carrier for absorbing and storing heat of high-temperature waste steam, and the mixed liquid formed by mixing the condensate, the sewage condensate and the temperature regulating liquid enters a flash evaporation tank for flash evaporation.
The high-temperature waste steam can not be completely condensed in the absorption tower, and as a further scheme of the device embodiment for recycling the cotton pulp production waste steam, the top of the absorption tower is provided with a non-condensed steam outlet which is communicated with the inlet end of the heating chamber of the black liquor evaporator, and the non-condensed steam which is not condensed in the absorption tower enters the black liquor evaporator through the non-condensed steam outlet to supply heat for the black liquor evaporator, so that the heat is further recycled.
As the further scheme of above-mentioned cotton pulp production waste vapor recycle's device embodiment, the flash tank has the flash liquid export, flash liquid export and absorption tower top intercommunication, be provided with the liquid pump that adjusts the temperature between flash liquid export and the absorption tower, the liquid pump that adjusts the temperature is used for going into the absorption tower top with the flash liquid pump, the flash liquid level low temperature liquid that produces after the flash distillation, the flash liquid gets into and is regarded as the liquid that adjusts the temperature behind the absorption tower, further condense the inside high temperature waste vapor of entering absorption tower, absorb and store the heat of high temperature waste vapor, be provided with the buffer tank between temperature adjusting liquid pump and the flash tank, be provided with the backwash pump between buffer tank and the flash tank, pump goes into the buffer tank with the flash liquid in the flash tank.
Specifically, spout and put a
Specifically, the waste liquid treatment equipment comprises a
Specifically, the tail gas treatment equipment comprises a washing tank and a combustor, the outlet end of a surface condenser is communicated with the inlet end of the washing tank, gas in the surface condenser can be pumped out through a vacuum pump, the outlet end of the washing tank is communicated with the combustor, tail gas generated by black liquor evaporation of a black liquor evaporator discharged from a tail gas outlet is mixed with the gas pumped out by the vacuum pump to form mixed gas, and the mixed gas is washed by the washing tank and then is sent to the combustor for combustion.
The invention also discloses a method for recycling the waste steam generated in cotton pulp production, and the device for recycling the waste steam generated in cotton pulp production comprises the following steps:
the method comprises the following steps of separating waste steam of a rotary spherical digester 1 emitted by the rotary spherical digester 1 into fiber waste liquid and high-temperature waste steam, specifically, the waste steam of the rotary spherical digester 1 emitted by the rotary spherical digester 1 is placed into a
the high-temperature waste steam enters the absorption tower and is condensed into condensed liquid. Specifically, a spraying system is arranged at the top of the absorption tower, high-temperature waste steam gradually rises after entering the absorption tower from the lower part of the absorption tower, and is condensed into condensed water and sinks under the spraying of the spraying system;
carrying out flash evaporation on the condensed liquid to generate flash steam and flash evaporation liquid, wherein the flash steam enters a heating chamber of the black liquor evaporator to supply heat to the black liquor evaporator, and the flash evaporation liquid is pumped back to a spraying system at the top of the absorption tower to supplement temperature-adjusting water for the spraying system;
the fiber waste liquid is recycled, specifically, the fiber waste liquid enters the micro-filter 31 after being separated from the
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention.
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