CN211367298U - Novel system for treating industrial wastewater by using bypass low-temperature flue gas - Google Patents

Novel system for treating industrial wastewater by using bypass low-temperature flue gas Download PDF

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Publication number
CN211367298U
CN211367298U CN201922109058.0U CN201922109058U CN211367298U CN 211367298 U CN211367298 U CN 211367298U CN 201922109058 U CN201922109058 U CN 201922109058U CN 211367298 U CN211367298 U CN 211367298U
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tank
water tank
communicated
flue
bypass
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周从波
曹相画
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Wuhan Z&y Environment Technology Co ltd
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Wuhan Z&y Environment Technology Co ltd
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Abstract

The utility model discloses a novel system for treating industrial wastewater by using bypass low-temperature flue gas, which comprises an evaporation tower, a middle water tank and an adjusting tank, wherein the evaporation tower is internally provided with a gas outlet of a bypass flue, a demister, a sprayer, a gas inlet of the bypass flue, a sedimentation tank, a clean water tank and the like from top to bottom; the clean water tank is communicated with the sprayer through a booster pump outside the tower; the clean water tank is provided with a liquid level meter controllable electromagnetic valve which can be opened and closed. This novel set up bypass flue and introduce the boiler flue gas waste heat that the mill no longer utilized from the flue main back and get into the evaporation tower, carry out the heat exchange with vaporific industrial waste water of shower spun, make industrial waste water obtain the evaporation and concentrate the crystallization to reach the purpose of industrial waste water zero release. The novel device can effectively solve the problems that the evaporation in the main flue easily scales and corrodes the main flue and the like to influence the operation of a main engine, and is simple and reliable.

Description

Novel system for treating industrial wastewater by using bypass low-temperature flue gas
Technical Field
The utility model belongs to the technical field of industrial waste water treatment, concretely relates to novel utilize system of bypass low temperature flue gas treatment industrial waste water.
Background
Industrial wastewater mainly comes from industries such as thermoelectricity, petrifaction, coal mine, printing and dyeing, papermaking and the like, and the damage to the environment is considerable, and the water guarantee event and the mountaineering event in the eight public nuisance events of the 20 th century are caused by industrial wastewater pollution. The components are complex, and the treatment process has long flow and great difficulty. Most of industrial wastewater is subjected to physicochemical pretreatment, biochemical treatment and advanced treatment processes at the early stage to remove most of insoluble solids, organic matters and toxic and harmful substances, and a treatment process for finally discharging high-concentration industrial wastewater with the Total Dissolved Solids (TDS) mass fraction of more than 8% becomes a key link for realizing zero discharge of wastewater. In 2015 for 4 months, the state has issued water pollution control action (abbreviated as water ten), the supervision and accountability mechanism for wastewater treatment is strengthened, the industrial wastewater only reaches the standard and cannot meet the current resource utilization and ecological protection standards, and the high-efficiency, saving and zero discharge become the main trends for treating the industrial wastewater.
The present mainstream treatment technology is that the treatment method of high-concentration industrial wastewater comprises a softening and high-efficiency membrane concentration technology and a softening and evaporative crystallization technology, wherein the TDS mass concentration of the high-concentration industrial wastewater treated by the softening and high-efficiency membrane concentration technology can reach 50000 and 80000mg/L, although the membrane treatment process has higher water recovery rate, research finds that, on the one hand, if the COD mass fraction in the waste liquid is higher than 6 × 10-5On the other hand, the concentration polarization phenomenon is aggravated by the increase of the salt content in the wastewater, and Cl-plasma in the water has corrosiveness, which can seriously affect the membrane efficiency and the service life. The 'softening and evaporative crystallization' technology finds that operation staff are required to operate and adjust a pretreatment softening system due to the change of the quality of wastewater in actual operation so as to avoid scaling in the subsequent concentration and crystallization processes, reduce the system efficiency and cause the whole system to stop operating in severe cases. However, from the actual operation effect, the two methods have the conditions of high investment intensity, high operation cost, high energy consumption and poor operation effect.
The process of pretreatment, softening, membrane concentration and direct flue injection is also a method for treating industrial wastewater. The flue direct injection treatment process is characterized in that an atomizing nozzle is arranged in a main flue, atomized liquid drops of waste water are evaporated after absorbing waste heat of flue gas at the tail of a boiler and discharged along with the flue gas, and solid matters and ash in the waste water are caught by a dust remover and discharged along with the ash. However, in actual operation, because the pretreatment is not closed, the nozzle is seriously blocked, and meanwhile, the flue is seriously accumulated with dust and corroded, thereby bringing influence to the operation of the whole system. In conclusion, I have designed a novel system for utilizing bypass low temperature flue gas to handle industrial waste water.
Disclosure of Invention
In order to solve the existing problems, the utility model provides a novel system for treating industrial wastewater by using bypass low-temperature flue gas.
The utility model discloses a realize through following technical scheme:
a novel system for treating industrial wastewater by using bypass low-temperature flue gas,
the novel utilization is that a plurality of large-scale factories such as power generation are composed of an evaporation tower, a middle water tank and an adjusting tank, wherein the evaporation tower is internally provided with an air outlet of a bypass flue, a demister, a sprayer, an air inlet of the bypass flue, a sedimentation tank and a clean water tank from top to bottom; the clean water tank is communicated with the sprayer through a booster pump outside the tower; the clean water tank is provided with a liquid level meter which can control the opening and closing of the electromagnetic valve; the inner ring of the clean water tank is provided with a sedimentation tank communicated with the regulating tank, the upper part of the inner ring is communicated with the overflow of the clean water tank, and the lower part of the inner ring is provided with a conical sludge tank communicated with the middle water tank through a sludge pump.
As a further optimization scheme of the utility model, a regulating tank is arranged outside the evaporation tower; the regulating tank is communicated with the sedimentation tank through an electromagnetic valve; the equalizing basin is provided with agitator and level gauge, but the start-stop of automatic control entire system.
As a further optimization scheme of the utility model, an intermediate water pool is arranged outside the evaporation tower; the intermediate water tank is communicated with the sedimentation tank through a sludge pump and is communicated with the filter press through the sludge pump; the middle water tank is provided with a doser, a stirrer and a liquid level meter, and the filter press can be automatically controlled to start and stop.
As a further optimization scheme of the utility model, an induced draft fan is arranged in the bypass flue outside the evaporation tower, one end of the induced draft fan is communicated with the main flue behind the dust remover, and the other end of the induced draft fan is communicated with the middle part of the evaporation tower; the top of the evaporation tower is communicated with a downstream main flue; the clean water tank is provided with an air inlet, and compressed air is filled when the system runs to prevent sludge from precipitating; the sedimentation tank is provided with an air inlet, and compressed air is filled in the sludge pump during operation, so that sludge blockage is prevented.
The waste heat (90-150 ℃) of low-temperature flue gas which can not be reused in factories, iron and steel factories, cement factories, chemical plants and the like exchanges heat with the vaporific industrial wastewater sprayed by the sprayer, thereby realizing the evaporation, concentration and crystallization of the wastewater, greatly reducing the cost of the industrial wastewater treatment, treating the waste with the waste, protecting the environment and saving the energy.
This is novel to introduce low temperature flue gas and get into the evaporating tower through setting up the bypass flue and handle industrial waste water, can effectively solve and directly spray the evaporation back at the main flue, has the chloride ion (Cl-), high salt (Na +, Mg +, etc.), enrichment such as heavy metal of high corrosivity in the waste water and influences the problem in the main flue life-span, reaches the dual purpose that neither influences the host computer operation and realize waste water "zero release" again.
The novel device introduces hot flue gas with the temperature of 90-150 ℃ from a main flue behind a dust remover, enters an evaporation tower from the middle part at the speed of about 7m/s to flow upwards, and exchanges heat with mist-shaped waste water sprayed downwards from a sprayer, so that the waste water is evaporated, concentrated and crystallized. The waste water which is not evaporated in time falls into the sedimentation tank, and the supernatant fluid overflows into the clean water tank again after the crystal is precipitated, and is evaporated circularly. The whole process is a pure physical process, and no new substances are generated, so that other expenses such as dosing and the like are not needed.
The novel low-temperature flue gas used is generally about 20% of the total amount of the flue gas of a factory, after heat exchange, the humidity is increased to about 8% from 5%, the flue gas temperature is reduced to 50-70 ℃ from 90-150 ℃, the wet flue gas returns to the main flue of the downstream again after liquid drops are removed through the demister, and then is mixed with the flue gas in the flue, so that the flue gas temperature of the main flue can not be greatly reduced, and the influence is brought to the subsequent process.
The novel draught fan is made of special materials, has the characteristics of good corrosion resistance, capability of dynamically adjusting air quantity and the like, one end of the draught fan is communicated with the main flue behind the dust remover, the other end of the draught fan is communicated with the middle part of the evaporation tower, and the top of the evaporation tower is communicated with the downstream main flue through a pipeline.
The novel booster pump is made of special materials, and has the characteristics of good corrosion resistance, capability of adjusting the flow according to the liquid-gas ratio in the tower in a transport state and the like.
The novel industrial wastewater treatment method does not need pretreatment and softening treatment in the early stage, and the sprayer used in the method is made of special materials, so that the novel industrial wastewater treatment method has the advantages of good corrosion resistance, good atomization effect and no scaling or blockage. The equipment investment can be greatly reduced, the operation is stable and reliable, and the cost of water treatment per ton is low.
The invention arranges a demister at the flue gas outlet at the upper part of the evaporation tower, which is used for separating water mist after heat exchange and separating the water mist containing chloride ions, sulfuric acid, sulfate and SOXAfter the water mist droplets are removed, the main flue can be prevented from being corroded by the water mist, and the service life of the main flue is ensured.
This is novel at inside sedimentation tank that sets up of evaporating tower, and waste water gets into the sedimentation tank from the equalizing basin is advanced, and heavy metal and crystallization fall into the toper sediment of below after the sediment and collect in the pond, the supernatant overflow gets into the clean water basin. The concentrated solution is sent into the middle water tank through a sludge pump, and compressed air is filled in the sludge pump during operation, so that sludge blockage is prevented.
This novel outer loop at inside sedimentation tank of evaporating tower sets up the clean water basin, and after the waste water supernatant overflow of sediment got into the clean water basin, send into the spray thrower by the booster pump and atomize. The clean water tank is provided with an air inlet, compressed air is filled in the clean water tank during the operation of the system to prevent sludge from precipitating, the clean water tank is also provided with a liquid level meter, the opening and closing of an electromagnetic valve of the regulating tank can be automatically controlled, the automatic water supply operation is realized, the manual intervention is not needed, and the labor cost is reduced.
This novel evaporation tower outside is provided with the equalizing basin, and the equalizing basin passes through solenoid valve and sedimentation tank intercommunication. The equalizing basin is provided with agitator and level gauge, but the start-stop of automatic control entire system.
This novel evaporation tower outside is provided with middle pond, and middle pond passes through sludge pump and sedimentation tank intercommunication, simultaneously through sludge pump and pressure filter intercommunication. The middle water tank is provided with a chemical feeder, a stirrer and a liquid level meter, and the filter press can be automatically controlled to start and stop. Adding a medicament through a medicament adding device arranged in the middle water tank to adjust the pH value, then sending the mixture into a filter press through a sludge pump to filter out sludge cakes and water, and sending the sludge cakes into a landfill for treatment; the water returns to the regulating tank and is circularly evaporated again
Compared with the prior art, the beneficial effects of the utility model are that: the novel tea bag has the four characteristics of 'one-time saving, two-time saving, three-time saving and four-time easy'.
(1) The whole investment is saved; the novel process only comprises a regulating pool, an evaporation tower and a middle water pool, the quantity of equipment is small, the occupied area is small, and the number of attached structures is small, so that the overall investment of the process is saved by more than 50% compared with other processes.
(2) The operation cost is low; A. the novel process utilizes the flue gas waste heat which can not be reused by a plurality of large-scale factories such as power plants, iron and steel plants, cement plants, chemical plants and the like as a heat source, and other heat sources are not needed; B. the whole treatment process is a physical process of evaporation of water, and no medicine is required to be added; C. the whole system is in full-automatic operation of the PLC, the automation degree is high, the manual intervention is low, the system operation can be ensured only by 1 worker per shift during the system operation, and the labor cost expenditure is greatly reduced. Therefore, the whole operation cost of the invention is saved by more than 70 percent compared with other processes.
(3) The treatment effect is good; the novel process forms a closed loop in the entire bypass system. After the industrial wastewater enters the system, namely the tail end, water molecules are evaporated and then discharged into the atmosphere along with flue gas, the generated sludge cake solid waste is hygienically buried, and one drop of wastewater cannot be discharged outside, so that the aim of zero emission of the industrial wastewater is really fulfilled. Therefore, compared with other processes, the method provided by the invention has the advantages of more stable operation and better treatment effect.
(4) The operation and maintenance are easy; the novel process is a physical evaporation process, has no chemical reaction, and has no new substance, thereby fundamentally avoiding the possibility of scaling. Meanwhile, the invention fully considers the process characteristics of each link and is provided with various safeguard measures, thereby greatly reducing the risk and pressure of later operation and maintenance and ensuring the continuous, stable and low-cost operation of the whole system.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: the system comprises an evaporation tower, an induced draft fan, a bypass flue, a regulating tank, a sedimentation tank, a clear water tank, a booster pump, a sprayer, a demister, a sludge pump, an intermediate water tank, a chemical feeder and an electromagnetic valve, wherein the evaporation tower comprises 1 part of the evaporation tower, 2 part of the induced draft fan, 3 part of the bypass flue, 4 part of the regulating tank, 5 part of the sedimentation tank, 6 part.
Detailed Description
The invention will be described in further detail with reference to the following detailed description and accompanying drawings:
as shown in fig. 1, a novel system for treating industrial wastewater by using bypass low-temperature flue gas comprises an evaporation tower (1), a middle water tank (11) and an adjusting tank (4), wherein an air outlet of a bypass flue (3), a demister (9), a spray thrower (8), an air inlet of the bypass flue (3), a sedimentation tank (5), a clean water tank (6) and the like are arranged in the evaporation tower (1) from top to bottom; the clean water tank (6) is communicated with a sprayer (8) through an external tower booster pump (7); the clean water tank (6) is provided with a liquid level meter which can control the opening and closing of the electromagnetic valve (13); the inner ring of the clean water tank (6) is provided with a sedimentation tank (5) communicated with the regulating tank (4), the upper part of the clean water tank is communicated with the clean water tank (6) in an overflowing way, and the lower part of the clean water tank is provided with a conical sludge tank which is communicated with the middle water tank (11) through a sludge pump (10); a regulating tank (4) is arranged outside the evaporation tower (1); the adjusting tank (4) is communicated with the sedimentation tank (5) through an electromagnetic valve (13); the adjusting tank (4) is provided with a stirrer and a liquid level meter, and the start and stop of the whole system can be automatically controlled; an intermediate water pool (11) is arranged outside the evaporation tower (1); the intermediate water tank (11) is communicated with the sedimentation tank (5) through a sludge pump (10) and is simultaneously communicated with the filter press through the sludge pump (10); the middle water tank (11) is provided with a chemical feeder (12), a stirrer and a liquid level meter, and can automatically control the start and stop of the filter press; an induced draft fan (2) is arranged in the bypass flue (3) outside the evaporation tower (1), one end of the induced draft fan is communicated with the main flue behind the dust remover, and the other end of the induced draft fan is communicated with the middle part of the evaporation tower (1); the top of the evaporation tower (1) is communicated with a downstream main flue; the clean water tank (6) is provided with an air inlet, and compressed air is filled when the system operates to prevent sludge from precipitating; the sedimentation tank (5) is provided with an air inlet, and compressed air is filled in the sludge pump (10) during operation, so that the sludge is prevented from being blocked.
The novel device leads the industrial wastewater into a regulating tank (4) for temporary storage and is controlled to automatically flow into a sedimentation tank (5) in the evaporation tower (1) through an electromagnetic valve (13) in the embodiment. After the wastewater enters the precipitation, suspended matters (SS), heavy metals and the like in the water are precipitated in a conical collecting tank below under the action of gravity, and supernatant overflows into a clean water tank (6); the waste water entering the clean water tank (6) enters the sprayer (8) through the booster pump (7), and the waste water forms water mist under the dual actions of pressure and a specially designed nozzle, so that the specific surface area of the water is increased, the full contact with hot flue gas is realized, and the heat exchange efficiency is increased. Hot flue gas with the temperature of 90-150 ℃ is introduced from the main flue behind the dust remover, enters the evaporation tower (1) from the middle part at the speed of about 7m/s to flow upwards, and exchanges heat with mist-shaped waste water sprayed downwards from the sprayer (8) to evaporate, concentrate and crystallize the waste water. The waste water which is not evaporated in time falls into the sedimentation tank (5), and the supernatant fluid overflows into the clean water tank (6) again after the crystal is precipitated, so that the waste water is evaporated circularly. The humidity of the flue gas after heat exchange is increased from 5% to about 8%, the temperature is reduced from 90-150 ℃ to 50-70 ℃, and the wet flue gas returns to the downstream main flue again after liquid drops are removed by the demister (9). The waste water after heat exchange is evaporated and then continuously concentrated and crystallized, and the crystallized substances are precipitated in a conical sedimentation tank (5), and the density reaches 1.5t/m3Left and right, the sewage is sent into an intermediate water tank (11) through a sludge pump (10). After a medicament is added through a medicament adding device (12) arranged in the middle water tank (11) to adjust the PH value, the mixture is sent to a filter press through a sludge pump (10) to filter out sludge cakes and water, and the sludge cakes are sent to a landfill site for treatment; the water content returns to the regulating tank (4) and is evaporated again.
The main flue refers to original flue equipment used for conveying flue gas in large-scale power plants, steel plants, cement plants, chemical plants and the like, the structure of the flue is not improved in the text, and the main flue is named as the main flue again in order to be different from a subsequently introduced bypass flue (3); the bypass flue (3) is a flue gas flowing channel reintroduced, leads the flue gas out of the main flue and leads the flue gas into the evaporation tower (1), and has the main function of communicating the main flue and the evaporation tower (1) and providing a channel for the flow of the flue gas; the evaporation tower (1) is a place for evaporating, concentrating and crystallizing industrial wastewater, the industrial wastewater is sprayed and flows from top to bottom in the evaporation tower (1), and the flue gas flows from bottom to top, so that the heat exchange between the flue gas and the industrial wastewater is realized through the counter flow of the flue gas and the industrial wastewater.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (4)

1. The utility model provides a novel utilize system of bypass low temperature flue gas treatment industrial waste water, comprises evaporating tower, middle pond, equalizing basin, its characterized in that: an air outlet of the bypass flue, a demister, a sprayer, an air inlet of the bypass flue, a sedimentation tank and a clean water tank are arranged in the evaporation tower from top to bottom; the clean water tank is communicated with the sprayer through a booster pump outside the tower; the clean water tank is provided with a liquid level meter which can control the opening and closing of the electromagnetic valve; the inner ring of the clean water tank is provided with a sedimentation tank communicated with the regulating tank, the upper part of the inner ring is communicated with the overflow of the clean water tank, and the lower part of the inner ring is provided with a conical sludge tank communicated with the middle water tank through a sludge pump.
2. The system for treating industrial wastewater by using bypass low-temperature flue gas as claimed in claim 1, wherein: an adjusting tank is arranged outside the evaporation tower; the regulating tank is communicated with the sedimentation tank through an electromagnetic valve; the equalizing basin is provided with agitator and level gauge, but the start-stop of automatic control entire system.
3. The system for treating industrial wastewater by using bypass low-temperature flue gas as claimed in claim 1, wherein: an intermediate water pool is arranged outside the evaporation tower; the intermediate water tank is communicated with the sedimentation tank through a sludge pump and is communicated with the filter press through the sludge pump; the middle water tank is provided with a doser, a stirrer and a liquid level meter, and the filter press can be automatically controlled to start and stop.
4. The system for treating industrial wastewater by using bypass low-temperature flue gas as claimed in claim 1, wherein: an induced draft fan is arranged in the bypass flue outside the evaporation tower, one end of the induced draft fan is communicated with the main flue behind the dust remover, and the other end of the induced draft fan is communicated with the middle part of the evaporation tower; the top of the evaporation tower is communicated with a downstream main flue; the clean water tank is provided with an air inlet, and compressed air is filled when the system runs to prevent sludge from precipitating; the sedimentation tank is provided with an air inlet, and compressed air is filled in the sludge pump during operation, so that sludge blockage is prevented.
CN201922109058.0U 2019-11-29 2019-11-29 Novel system for treating industrial wastewater by using bypass low-temperature flue gas Expired - Fee Related CN211367298U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110963623A (en) * 2019-11-29 2020-04-07 武汉正元环境科技股份有限公司 Novel system for treating industrial wastewater by using bypass low-temperature flue gas
CN113443671A (en) * 2021-09-01 2021-09-28 大唐环境产业集团股份有限公司 Desulfurization wastewater zero-discharge system and method convenient for cleaning

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110963623A (en) * 2019-11-29 2020-04-07 武汉正元环境科技股份有限公司 Novel system for treating industrial wastewater by using bypass low-temperature flue gas
CN113443671A (en) * 2021-09-01 2021-09-28 大唐环境产业集团股份有限公司 Desulfurization wastewater zero-discharge system and method convenient for cleaning
CN113443671B (en) * 2021-09-01 2021-11-02 大唐环境产业集团股份有限公司 Desulfurization wastewater zero-discharge system and method convenient for cleaning

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Assignee: Weihai Zhengyuan Environmental Technology Co.,Ltd.

Assignor: WUHAN Z&Y ENVIRONMENT TECHNOLOGY Co.,Ltd.

Contract record no.: X2020420000017

Denomination of utility model: A new type of industrial wastewater treatment system using bypass low temperature flue gas

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Granted publication date: 20200828