CN211189753U - Comprehensive treatment device for waste water and waste gas - Google Patents
Comprehensive treatment device for waste water and waste gas Download PDFInfo
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- CN211189753U CN211189753U CN201922031341.6U CN201922031341U CN211189753U CN 211189753 U CN211189753 U CN 211189753U CN 201922031341 U CN201922031341 U CN 201922031341U CN 211189753 U CN211189753 U CN 211189753U
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Abstract
The utility model provides a waste water and waste gas integrated processing device, the device includes waste gas collection device, waste water vaporization device, burns device and SCR device, waste gas collection device and waste water vaporization device independently with burn the device and link to each other, the export that burns the device links to each other with the SCR device. The device of the utility model burns the waste gas as combustion-supporting gas and vaporized waste liquid together, thereby not only reducing the difficulty of the independent treatment of the waste gas, but also reducing the energy consumption required by the waste water treatment, realizing the comprehensive treatment of the waste gas and the waste water in the production, and having high utilization efficiency of the heat in the device; the device has the advantages of simple structure, simple and convenient operation and low energy consumption, and is suitable for large-scale treatment of waste gas and waste liquid in organic product production.
Description
Technical Field
The utility model belongs to the technical field of the pollutant is handled, a waste water and waste gas integrated processing device is related to.
Background
With the rapid development of economic society, the pollution problem comes with, and the types of pollutants generated by different industries are also greatly different. Generally, in the systematic production process of organic products, a large amount of staged wastewater is often generated, and in the treatment process of the wastewater, a plurality of pollution gases such as VOCs are sometimes generated, so that the treatment process and difficulty of pollutants are greatly increased.
The organic waste gas generated in the waste water treatment process includes various treatment methods, such as a condensation method, an absorption method, an adsorption method, a combustion method, a plasma method, and the like. However, the condensation method in the above method generally only can separate gas, and also needs to perform subsequent treatment, and is generally used as a pretreatment process, and is mainly suitable for recovering high-concentration VOCs with few components; the absorption method is mainly suitable for the absorption and conversion of inorganic gas, and organic solvent is often needed for organic gas, so that the cost is high, and secondary pollution is easily caused; if the adsorption method is only used for one-time adsorption, the consumption of the adsorbent is extremely high, and if the adsorbent is recovered after adsorption, the desorption or desorption of pollutants has strict requirements on the types of the pollutants, so that the application range is narrow; the plasma method needs high-voltage pulse corona discharge to generate high-energy active particles to oxidize and degrade organic matters, but the method needs high cost, is still in a laboratory research stage, and does not have the basis of large-scale application.
At present, the combustion method is still the main means for treating organic waste gas, and the waste gas combustion mainly comprises catalytic combustion and non-catalytic combustion. CN 106196105A discloses a switching concentrated type heat storage catalytic combustion organic waste gas treatment system, which comprises a desulfurization and denitrification treatment device, a switching concentrated desorption device and a heat storage catalytic combustion device which are sequentially connected, wherein the switching concentrated desorption device comprises a first adsorption module and a second adsorption module, the heat storage catalytic combustion device comprises a combustion chamber, a combustion nozzle and at least two heat storage type heat exchangers, and a catalyst touch screen is arranged in the combustion chamber; the treatment system adopts the methods of adsorption concentration and catalytic combustion, the catalyst has higher requirements on waste gas components, advanced purification treatment is needed, the system structure is more complex, the cost of the device and the catalyst is higher, and the required energy consumption is also higher.
CN 203549850U discloses an organic waste gas integrated processing system, processing system includes refinery raw materials storage tank, desulfurization reactor, sewage treatment field, gas mixing tank, heat accumulation combustion reactor and steam generator, the system carries out heat accumulation burning after carrying out desulfurization treatment with organic waste gas, and the required energy consumption of heat accumulation burning is higher, and its mainly used in the processing of high concentration organic waste gas, often difficult abundant burning when concentration is lower causes secondary gas pollution.
In conclusion, for the treatment of the organic waste gas, the full combustion can be realized on the basis of improving the concentration, and meanwhile, the device can be simplified, the energy consumption is reduced, and the utilization efficiency of heat is improved.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model aims to provide a waste water and waste gas comprehensive treatment device, which burns combustion-supporting gas generated in the production process and organic waste water together to achieve the purpose of simultaneously treating waste gas and waste water and reduce the difficulty of independently treating low-concentration waste gas; the device has simple structure, simple and convenient operation and low required energy consumption.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a waste water and waste gas integrated processing device, the device includes waste gas collection device, waste water vaporization device, burns device and SCR device, waste gas collection device and waste water vaporization device independently with burn the device and link to each other, the export that burns the device links to each other with the SCR device.
The utility model discloses in, the device is through the vaporization to the collection of waste gas and waste water, and both all are mainly organic components, and waste gas burns jointly as combustion-supporting gas and vaporization waste liquid, has both reduced the degree of difficulty of waste gas independent processing, has also reduced the required energy consumption of waste water treatment, realizes the integrated processing of waste gas and waste water in the production, and the flue gas that produces after the burning mainly passes through denitration treatment again, carries out discharge to reach standard.
Following conduct the utility model discloses preferred technical scheme, nevertheless do not conduct the utility model provides a technical scheme's restriction, through following technical scheme, can reach and realize better the utility model discloses a technical purpose and beneficial effect.
As the utility model discloses preferred technical scheme, waste gas collection device includes gas collecting channel and fan, the gas collecting channel passes through the pipeline and links to each other with the fan.
The utility model discloses in, the main source of waste gas is the waste gas that produces among the sewage treatment process of mill, adopts the gas collecting channel to collect the back fan with it and carries.
As the preferable technical proposal of the utility model, the device also comprises a sewage treatment device, and the gas-collecting hood covers the sewage treatment device in a sealing way; wherein the sewage treatment device is generally a sewage tank.
As the utility model discloses preferred technical scheme, waste water vapourizing unit includes concentrator and evaporimeter, the liquid outlet of concentrator links to each other with the evaporimeter, the gas outlet of evaporimeter links to each other with burning the device.
In the utility model, as the phthalonitrile products are mainly produced, the waste water is organic waste water, and in order to avoid too much water vapor during incineration treatment, concentration treatment is firstly carried out, the concentration of the waste water is improved, and evaporation and vaporization are carried out; the heat source required by concentration and evaporation can be steam, and the steam is from other working procedures in the production flow of the product or heat released by cooling of the burnt flue gas.
As the preferred technical proposal of the utility model, the burning device comprises a direct-fired incinerator.
The utility model discloses in, the burning of organic waste gas generally selects the direct combustion formula to burn burning furnace to directly utilize the heat that the back flue gas of burning carried, and for the abundant burning of waste gas and vaporization waste water, can further select the fluidized bed to burn burning furnace.
As the utility model discloses preferred technical scheme, the device still includes the heat exchanger, the heat exchanger sets up between exhaust gas collecting device and the device that burns.
The utility model discloses in, the heat exchanger includes shell and tube heat exchanger or double pipe heat exchanger.
Preferably, the outlet of the fan is connected with the cold source inlet of the heat exchanger, and the cold source outlet of the heat exchanger is connected with the inlet of the incineration device.
Preferably, the outlet of the incineration device is connected with the heat source inlet of the heat exchanger, and the heat source outlet of the heat exchanger is connected with the SCR device.
The utility model discloses in, waste gas is in room temperature state after collecting basically, in order to regard as combustion-supporting gas better, and need heat consumption earlier heaies up when non-burns, carries out the heat transfer and heaies up before getting into the incineration device, and because the flue gas need cool down before carrying out the aftertreatment, just in time can regard as waste gas heaies up's heat source, has improved the heat utilization efficiency in the device.
As the preferred technical scheme of the utility model, the device still includes the chimney, the gas outlet of SCR device links to each other with the chimney entry.
On the other hand, the utility model provides a method for adopt above-mentioned device to carry out waste water and waste gas integrated processing, the method includes:
collecting the waste gas to be treated, then incinerating the waste gas and the vaporized waste water together, and then carrying out SCR reaction to obtain purified gas.
As the preferred technical scheme of the utility model, the source of pending waste gas includes the effluent water sump.
The utility model discloses in, pending waste gas except effluent water sump waste gas, can also handle multiple organic gases such as organic technology waste gas, organic liquid storage tank breathing gas or organic unorganized waste gas.
Preferably, the collection process of the waste gas to be treated is as follows: and covering the sewage tank by using a gas collecting hood, and conveying waste gas by using a fan.
Preferably, the fan internal pressure is controlled to be-80 to-100 Pa, for example, -80Pa, -85Pa, -90Pa, -95Pa or-100 Pa, but the invention is not limited to the values listed, and other values not listed in the range are equally applicable.
In the present invention, unless otherwise specified, all the pressures mentioned refer to gauge pressures; the pressure was negative, indicating that it was below atmospheric pressure and in a vacuum state.
Preferably, the composition of the waste gas to be treated comprises VOCs, mainly comprises methane, and in addition, a small amount of inorganic waste gas such as ammonia, hydrogen sulfide and the like is contained.
As a preferred embodiment of the present invention, the composition of the wastewater comprises any one or a combination of at least two of phthalonitrile, xylene, benzonitrile or methylbenzamide, and the combination is typically but not limited to: combinations of phthalonitrile and xylene, phthalonitrile and benzonitrile, xylene, benzonitrile and methylbenzamide, and the like.
The utility model discloses in, waste water is mainly the waste water that produces in the phthalonitrile production process, therefore its constitution mainly is organic composition such as relevant accessory substance.
Preferably, the wastewater is concentrated, and the COD value of the concentrated wastewater is 100000-150000 mg/L, such as 100000 mg/L, 110000 mg/L0, 120000 mg/L1, 130000 mg/L2, 140000 mg/L3 or 150000 mg/L, but not limited to the recited values, and other non-recited values in the range of the values are also applicable, and the total nitrogen content is 100000-200000 mg/L, such as 100000 mg/L, 120000 mg/L, 140000 mg/L, 160000 mg/L, 180000 mg/L or 200000 mg/L, but not limited to the recited values, and other non-recited values in the range of the values are also applicable.
In the utility model discloses in, for the gasification that organic component can be better in the waste water, carry out concentration treatment earlier, obtain the organic waste water of high COD, high total nitrogen content, contain ammonia in the waste water equally, be alkaline, pH value is 10 ~ 13, for example 10, 10.5, 11, 11.5, 12, 12.5 or 13 etc. but not limited to the numerical value of enumerating, other numerical values not enumerating are equally suitable for in this numerical value range.
Preferably, the concentrated wastewater is evaporated at an evaporation temperature of 120 to 140 ℃, for example 120 ℃, 125 ℃, 130 ℃, 135 ℃ or 140 ℃, but not limited to the recited values, and other values not recited in the range of the recited values are also applicable.
Preferably, the heat source for the concentration and evaporation vaporization is saturated steam having a pressure of 0.2 to 0.5MPa, such as 0.2MPa, 0.25MPa, 0.3MPa, 0.35MPa, 0.4MPa, 0.45MPa or 0.5MPa, but not limited to the recited values, and other values not recited in the range of values are also applicable.
The utility model discloses in, saturated steam's source can be selected from other processes in the product production flow, also can select the flue gas after the incineration disposal, and the heat of flue gas cooling release is used for producing steam.
As the utility model discloses preferred technical scheme, preheat earlier after pending waste gas is collected.
Preferably, the exhaust gas is preheated to a temperature of 450 to 550 ℃, for example 450 ℃, 460 ℃, 480 ℃, 500 ℃, 520 ℃, 540 ℃ or 550 ℃, but not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the temperature of the incineration treatment is 800 to 900 ℃, for example 800 ℃, 820 ℃, 840 ℃, 850 ℃, 860 ℃, 880 ℃, 900 ℃ or the like, but is not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the pressure of the incineration treatment is 100 to 300Pa, for example, 100Pa, 120Pa, 150Pa, 180Pa, 200Pa, 240Pa, 270Pa, or 300Pa, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the flue gas obtained by incineration is used as a heat source for preheating waste gas.
As the preferred technical proposal of the utility model, the incineration disposal is carried out in the incineration device.
Preferably, the volume ratio of the exhaust gas to the vaporized wastewater entering the incineration device is (3-8): 1, for example, 3:1, 4:1, 5:1, 6:1, 7:1 or 8:1, but not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the incinerator is initially operated, and fuel is used for heating.
The utility model discloses in, burn the device and examine earlier before the operation, then let in compressed gas and sweep, ignite the intensification again, can use the natural gas as fuel, make it reach reaction temperature, have the flue gas to produce after operation a period, can preheat waste gas, stop to let in fuel this moment to waste gas is as combustion-supporting gas.
Preferably, the temperature of the SCR reaction is 300 to 400 ℃, for example 300 ℃, 320 ℃, 340 ℃, 350 ℃, 360 ℃, 380 ℃ or 400 ℃, but is not limited to the recited values, and other values not recited within the range of the values are also applicable.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the device of the utility model burns the waste gas as combustion-supporting gas and vaporized waste liquid together, thereby not only reducing the difficulty of the independent treatment of the waste gas, but also reducing the energy consumption required by the waste water treatment, realizing the comprehensive treatment of the waste gas and the waste water in the production, and having high heat utilization efficiency in the treatment process;
(2) device simple structure, it is easy and simple to handle, required energy consumption is lower, is applicable to the scale of waste gas waste liquid and handles in the organic product production.
Drawings
FIG. 1 is a schematic structural diagram of an integrated wastewater and exhaust gas treatment device provided in embodiment 1 of the present invention;
the system comprises a sewage tank 1, a gas collecting hood 2, a fan 3, a heat exchanger 4, an incinerator 5, a concentrator 6, an evaporator 7, an SCR device 8 and a chimney 9.
Detailed Description
To better explain the utility model, the technical proposal of the utility model is convenient to understand, and the utility model is further explained in detail below. However, the following embodiments are only simple examples of the present invention, and do not represent or limit the scope of the present invention, which is defined by the appended claims.
The utility model discloses the embodiment part provides a waste water and waste gas integrated processing device, the device includes waste gas collection device, waste water vaporization device, burns device 5 and SCR device 8, waste gas collection device and waste water vaporization device independently with burn device 5 and link to each other, the export that burns device 5 links to each other with SCR device 8.
The following are typical but non-limiting examples of the present invention:
example 1:
the embodiment provides a waste water and waste gas integrated processing device, the schematic structural diagram of the device is shown in fig. 1, and the device comprises a waste gas collecting device, a waste water vaporizing device, an incineration device 5 and an SCR device 8, wherein the waste gas collecting device and the waste water vaporizing device are independently connected with the incineration device 5, and the outlet of the incineration device 5 is connected with the SCR device 8.
The waste gas collecting device comprises a gas collecting hood 2 and a fan 3, wherein the gas collecting hood 2 is connected with the fan 3 through a pipeline; the device comprises a sewage tank 1, and the gas-collecting hood 2 covers the sewage tank 1 in a closed manner.
The waste water vaporization device comprises a concentrator 6 and an evaporator 7, wherein a liquid outlet of the concentrator 6 is connected with the evaporator 7, and a gas outlet of the evaporator 7 is connected with the incineration device 5.
The incineration device 5 comprises a direct-fired incinerator.
The device also comprises a heat exchanger 4, wherein an outlet of the fan 3 is connected with a cold source inlet of the heat exchanger 4, and a cold source outlet of the heat exchanger 4 is connected with an inlet of the incineration device 5; the outlet of the incineration device 5 is connected with the heat source inlet of the heat exchanger 4, and the heat source outlet of the heat exchanger 4 is connected with the SCR device 8.
The device also comprises a chimney 9, and the outlet of the SCR device 8 is connected with the chimney 9.
Example 2:
the embodiment provides a waste water and waste gas integrated processing device, the device includes waste gas collection device, waste water vaporization device, burns device 5 and SCR device 8, waste gas collection device and waste water vaporization device link to each other with burning device 5 independently, the export of burning device 5 links to each other with SCR device 8.
The waste gas collecting device comprises a gas collecting hood 2 and a fan 3, wherein the gas collecting hood 2 is connected with the fan 3 through a pipeline; the gas-collecting hood 2 is connected with a plurality of branch pipes, and then the branch pipes are gathered into a main pipe to be connected with the fan 3.
The device comprises a sewage tank 1, and the gas-collecting hood 2 covers the sewage tank 1 in a closed manner.
The waste water vaporization device comprises an evaporator 7, and a gas outlet of the evaporator 7 is connected with the incineration device 5.
The incineration device 5 comprises a direct-fired incinerator.
The device also comprises a heat exchanger 4, wherein an outlet of the fan 3 is connected with a cold source inlet of the heat exchanger 4, and a cold source outlet of the heat exchanger 4 is connected with an inlet of the incineration device 5; the outlet of the incineration device 5 is connected with the heat source inlet of the heat exchanger 4, and the heat source outlet of the heat exchanger 4 is connected with the SCR device 8.
Example 3:
the embodiment provides a method for comprehensively treating wastewater and waste gas, which is carried out by adopting the device in the embodiment 1 and comprises the following steps:
(1) collecting waste gas generated by the sewage tank 1, conveying the waste gas by using a fan 3, wherein the pressure in the fan is-100 Pa, preheating, and heating to 500 ℃;
(2) concentrating the waste water generated in the production process of an isophthalonitrile product until the COD value reaches 100000 mg/L, then evaporating and vaporizing at 130 ℃, wherein the heat source of concentration and evaporation and vaporization adopts saturated steam with the pressure of 0.3 MPa;
(3) feeding the preheated waste gas in the step (1) and the vaporized waste water in the step (2) into an incineration device 5 according to the volume ratio of 5:1, and carrying out incineration treatment at 850 ℃ under the condition of 100Pa to obtain flue gas as a heat source for preheating the waste gas;
(4) and (4) carrying out SCR reaction on the flue gas subjected to heat exchange and temperature reduction in the step (3), wherein the reaction temperature is 350 ℃, and obtaining purified gas which reaches the emission standard.
In the embodiment, the method realizes the comprehensive treatment of the organic waste gas and the waste water, the heat utilization efficiency is high, and the removal rate of nitrogen oxides in the finally discharged gas reaches over 90 percent.
Example 4:
the embodiment provides a method for comprehensively treating wastewater and waste gas, which is carried out by adopting the device in the embodiment 1 and comprises the following steps:
(1) collecting waste gas generated by the sewage tank 1, conveying the waste gas by using a fan 3, preheating the waste gas until the pressure in the fan is-80 Pa, and heating the waste gas to 450 ℃;
(2) concentrating the wastewater generated in the production process of a terephthalonitrile product until the COD value reaches 150000 mg/L, then evaporating and vaporizing at 120 ℃, wherein the heat source for concentration and evaporation and vaporization adopts saturated steam with the pressure of 0.2 MPa;
(3) the preheated waste gas in the step (1) and the vaporized waste water in the step (2) enter an incineration device 5 according to the volume ratio of 8:1, and are incinerated at the temperature of 800 ℃ and under the pressure of 250Pa, and the obtained flue gas is used as a heat source for preheating the waste gas;
(4) and (4) carrying out SCR reaction on the flue gas subjected to heat exchange and temperature reduction in the step (3), wherein the reaction temperature is 300 ℃, and obtaining purified gas which reaches the emission standard.
In the embodiment, the method realizes the comprehensive treatment of the organic waste gas and the waste water, the heat utilization efficiency is high, and the removal rate of nitrogen oxides in the finally discharged gas reaches over 90 percent.
Example 5:
the embodiment provides a method for comprehensively treating wastewater and waste gas, which is carried out by adopting the device in the embodiment 2 and comprises the following steps:
(1) collecting waste gas generated by the sewage tank 1, conveying the waste gas by using a fan 3, preheating the waste gas until the pressure in the fan is-90 Pa, and heating the waste gas to 500 ℃;
(2) carrying out evaporation vaporization on waste water with a COD value of 75000 mg/L generated in the production process of an m-phthalonitrile product at 140 ℃, wherein the heat source of the evaporation vaporization adopts saturated steam with the pressure of 0.5 MPa;
(3) feeding the preheated waste gas in the step (1) and the vaporized waste water in the step (2) into an incineration device 5 according to the volume ratio of 3:1, and carrying out incineration treatment at 900 ℃ and 150Pa to obtain flue gas as a heat source for preheating the waste gas;
(4) and (4) carrying out SCR reaction on the flue gas subjected to heat exchange and temperature reduction in the step (3), wherein the reaction temperature is 400 ℃, and obtaining purified gas which reaches the emission standard.
In the embodiment, the method realizes the comprehensive treatment of the organic waste gas and the waste water, the heat utilization efficiency is high, and the removal rate of nitrogen oxides in the finally discharged gas reaches over 90 percent.
According to the embodiment, the waste gas is used as combustion-supporting gas and is incinerated together with the vaporized waste liquid, so that the difficulty of independent treatment of the waste gas is reduced, the energy consumption required by waste water treatment is reduced, the comprehensive treatment of the waste gas and the waste water in production is realized, and the utilization efficiency of the heat in the device is high; the device has the advantages of simple structure, simple and convenient operation and low energy consumption, and is suitable for large-scale treatment of waste gas and waste liquid in organic product production.
The applicant states that the present invention is described in the above embodiments, but the present invention is not limited to the above detailed device, i.e. the present invention must not be implemented by relying on the above detailed device. It should be clear to those skilled in the art that any improvement of the present invention, to the addition of the equivalent replacement and auxiliary devices of the present invention, the selection of the specific mode, etc., all fall within the scope of protection and disclosure of the present invention.
Claims (10)
1. The utility model provides a waste water and waste gas integrated processing device which characterized in that, the device includes waste gas collection device, waste water vaporization device, burns device and SCR device, waste gas collection device and waste water vaporization device link to each other with burning the device independently, burn the export of device and link to each other with the SCR device.
2. The treatment device of claim 1, wherein the exhaust collection device comprises a gas collection hood and a fan, and the gas collection hood is connected to the fan through a pipe.
3. The treatment apparatus of claim 2, further comprising a sewage treatment apparatus, wherein the gas collecting enclosure is enclosed over the sewage treatment apparatus.
4. The treatment apparatus according to claim 1, wherein the wastewater vaporization apparatus comprises a concentrator and an evaporator, a liquid outlet of the concentrator is connected to the evaporator, and a gas outlet of the evaporator is connected to the incineration apparatus.
5. The treatment apparatus according to claim 1, wherein the incineration apparatus comprises a direct-fired incinerator.
6. The treatment device of claim 2, further comprising a heat exchanger disposed between the exhaust gas collection device and the incineration device.
7. The treatment device according to claim 6, wherein the outlet of the fan is connected with the cold source inlet of the heat exchanger, and the cold source outlet of the heat exchanger is connected with the inlet of the incineration device.
8. The process arrangement of claim 6, wherein the outlet of the incineration device is connected to a heat source inlet of a heat exchanger, and a heat source outlet of the heat exchanger is connected to the SCR device.
9. The process arrangement of claim 6, wherein the heat exchanger comprises a shell and tube heat exchanger or a double tube heat exchanger.
10. The treatment device of claim 1, further comprising a stack, wherein the gas outlet of the SCR device is connected to a stack inlet.
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| CN110732242A (en) * | 2019-11-21 | 2020-01-31 | 江苏新河农用化工有限公司 | comprehensive treatment device and method for wastewater and waste gas |
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