CN211781134U - Incineration disposal system for waste gas and liquid containing chlorine - Google Patents

Abstract

The utility model provides an incineration disposal system of chlorine waste gas waste liquid, incineration disposal system is including the unit of burning that arranges in proper order, rapid cooling unit and absorption unit, and set up the hydrochloric acid recovery unit in the low reaches of absorption unit, the absorption unit includes one-level absorption tower and second grade absorption tower, the exhanst gas outlet of one-level absorption tower and the flue gas import intercommunication of second grade absorption tower, the liquid outlet of second grade absorption tower passes through the overflow intercommunication with the liquid import of one-level absorption tower, in order to carry second grade absorption liquid to one-level absorption tower, one-level absorption tower and hydrochloric acid recovery unit intercommunication, in order to carry one-level absorption liquid to hydrochloric acid recovery unit partially. The utility model provides an incineration disposal system can get rid of in quenching treatment through impurity such as most smoke and dust in earlier the flue gas, then absorbs the hydrogen chloride in the flue gas, obtains hydrochloric acid through recovery processing with the absorption liquid, can avoid impurity such as smoke and dust to sneak into hydrochloric acid like this to improve the quality of retrieving hydrochloric acid.

Description

Incineration disposal system for waste gas and liquid containing chlorine

Technical Field

The utility model relates to a waste material handles technical field, and more specifically relates to an incineration disposal system of chlorine waste gas waste liquid.

Background

Generally, waste gas and liquid of organic compounds are incinerated at high temperature, converted into carbon dioxide and water and then discharged to the atmosphere. As long as the temperature in the incinerator is more than 850 ℃ and the waste gas and liquid have enough residence time in the high-temperature area in the hearth, the waste materials can be basically and completely decomposed, and the pollution-free discharge is realized. However, chlorine-containing organic waste gas waste liquid can generate hydrogen chloride and free chlorine during incineration, and the inner surface at the tail part of the incinerator can be corroded by low temperature; chlorine is an extremely toxic substance and is easy to cause great damage to the environment, and the concentration of nitrogen oxides and dioxin in flue gas after incineration of chlorine-containing organic waste gas and waste liquid cannot meet the increasingly strict environmental protection emission requirement. In addition, the waste liquid generally contains impurities such as iron, and the impurities are mixed into the hydrochloric acid to affect the quality of the acid, so that the recovered hydrochloric acid has low utilization value.

Therefore, there is a need for an incineration disposal system for waste chlorine-containing gas, which at least partially solves the problems of the prior art.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content does not imply any attempt to define the essential features and essential features of the claimed solution, nor is it implied to be intended to define the scope of the claimed solution.

In order to solve the above problem at least in part, according to an aspect of the present invention, there is provided an incineration disposal system for chlorine-containing waste gas waste liquid for incinerating chlorine-containing waste liquid and/or waste gas, comprising:

an incineration unit for incinerating the waste liquid and/or the exhaust gas to produce a flue gas including hydrogen chloride;

the quenching unit is used for quenching the flue gas from the incineration unit, is arranged at the downstream of the incineration unit and is communicated with the incineration unit;

the absorption unit is used for absorbing hydrogen chloride in the flue gas from the quenching unit, is arranged at the downstream of the quenching unit and is communicated with the quenching unit;

a hydrochloric acid recovery unit disposed downstream of the absorption unit,

the absorption unit comprises a first-stage absorption tower and a second-stage absorption tower located at the downstream of the first-stage absorption tower, a smoke outlet of the first-stage absorption tower is communicated with a smoke inlet of the second-stage absorption tower, a liquid outlet of the second-stage absorption tower is communicated with a liquid inlet of the first-stage absorption tower through overflow so as to convey a second-stage absorption liquid to the first-stage absorption tower, and the first-stage absorption tower is communicated with the hydrochloric acid recovery unit so as to partially convey the first-stage absorption liquid to the hydrochloric acid recovery unit.

According to the scheme, the hydrochloric acid recovery unit is separated from the quenching unit, the hydrochloric acid recovery unit is communicated with the primary absorption tower of the absorption unit, most of impurities such as smoke dust in the smoke gas can be removed in the quenching treatment, then the hydrogen chloride in the smoke gas is absorbed, and the absorption liquid is subjected to recovery treatment to obtain the hydrochloric acid, so that the impurities such as smoke dust can be prevented from being mixed into the hydrochloric acid, and the quality of the recovered hydrochloric acid is improved.

Optionally, the hydrochloric acid recovery unit comprises a bag filter, an activated carbon filter and a decolorization device which are connected in series in sequence.

Optionally, a scrub column comprising an upper scrub chamber and a lower scrub chamber, the upper scrub chamber being separated from the lower scrub chamber by a perforated partition is also included.

Optionally, the upper washing chamber is connected with a water supply pipeline; and the lower washing chamber is connected with an alkali liquor supply pipeline.

Optionally, the upper washing chamber and the lower washing chamber are provided with overflow means to overflow the secondary washing liquid of the upper washing chamber to the lower washing chamber.

Optionally, the upper washing chamber and the lower washing chamber are each provided with a washing backflow device for returning the washing liquid to the roof.

Optionally, the primary absorption tower and the secondary absorption tower are both provided with an absorption reflux device for refluxing the absorption liquid at the bottom of the tower to the top of the tower.

Optionally, the quench unit comprises a quench tower and a quench reflux device, wherein the quench reflux device is used for refluxing the bottom waste acid of the quench tower to the top of the quench tower, and a water supply pipeline is connected to the quench tower.

Optionally, the system further comprises a denitration device arranged at the downstream of the washing tower, wherein the denitration device is filled with a catalyst for removing dioxin and nitrogen oxides.

Optionally, the system further comprises a heating device arranged between the washing tower and the denitration device, a flue gas heat exchanger is arranged on a downstream pipeline of the denitration device, a cold fluid inlet of the flue gas heat exchanger is communicated with a flue gas outlet of the washing tower, and a cold fluid outlet of the flue gas heat exchanger is communicated with a flue gas inlet of the heating device.

According to another aspect of the present invention, there is provided a method for treating chlorine-containing waste gas and/or waste gas by incineration using the incineration system according to any one of the above aspects.

According to the scheme, the hydrochloric acid recovery treatment and the quenching treatment are separated, the hydrochloric acid recovery treatment is arranged after the primary absorption treatment of the absorption treatment, most of impurities such as smoke dust in the smoke are removed in the quenching treatment, then the hydrogen chloride in the smoke is absorbed, and the absorption liquid is subjected to recovery treatment to obtain the hydrochloric acid, so that the impurities such as smoke dust can be prevented from being mixed into the hydrochloric acid, and the quality of the recovered hydrochloric acid is improved.

Drawings

The following drawings of the present invention are used herein as part of the present invention for understanding the present invention. There are shown in the drawings embodiments of the invention and the description thereof for the purpose of illustrating the devices and principles of the invention. In the drawings, there is shown in the drawings,

fig. 1 is a block diagram of an incineration disposal system according to a preferred embodiment of the present invention.

Description of the reference numerals

1: first combustor 2: incinerator

3: and (4) a combustion-supporting fan: waste heat boiler

5: quenching tower 6: quenching circulating pump

7: quenching heat exchanger 8: dirty sour storage tank

9: the sewage pump 10: first-stage absorption tower

11: primary absorption circulation pump 12: first-stage absorption heat exchanger

13: secondary absorption tower 14: two-stage absorption circulating pump

15: secondary absorption heat exchanger 16: washing tower

16 a: upper washing chamber 16 b: lower washing chamber

17: first-stage washing circulation pump 18: two-stage washing circulating pump

19: the bag filter 20: activated carbon filter

21: the decoloring device 22: smoke heat exchanger

23: heating device 24: second burner

25: denitration device 26: draught fan

27: chimney

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It is apparent that the practice of the invention is not limited to the specific details known to those skilled in the art. The present invention is described in detail below with reference to the preferred embodiments, however, the present invention can have other embodiments in addition to the detailed description, and should not be construed as being limited to the embodiments set forth herein.

It is to be understood that the terms "a," "an," and "the" as used herein are intended to describe specific embodiments only and are not to be taken as limiting the invention, which is intended to include the plural forms as well, unless the context clearly indicates otherwise. When the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The terms "upper", "lower", "front", "rear", "left", "right" and the like as used herein are for illustrative purposes only and are not limiting.

Ordinal words such as "first" and "second" are referred to in this application as labels only, and do not have any other meanings, such as a particular order, etc. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component".

Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the present invention and do not limit the present invention.

As shown in FIG. 1, the utility model provides an incineration disposal system for waste liquid containing chlorine waste gas, which is used for incinerating waste liquid and/or waste gas containing chlorine, and more preferably, incinerating waste liquid and waste gas containing chlorine simultaneously. Specifically, the waste liquid may be a chlorine-containing waste liquid, such as a chlorine-containing organic waste liquid, and the waste gas may be a chlorine-containing waste gas, such as a chlorine-containing organic waste gas.

The incineration disposal system may include an incineration unit, a quench unit, and an absorption unit. The incineration unit is used for incinerating waste liquid and/or waste gas to generate flue gas containing hydrogen chloride. The quenching unit is used for quenching treatment of the flue gas from the incineration unit. The absorption unit is used for absorbing hydrogen chloride in the flue gas from the quenching unit. Conveying the chlorine-containing waste liquid and/or the chlorine-containing waste gas to an incineration unit for incineration; the flue gas generated after incineration sequentially enters a quenching unit and an absorption unit to be purified.

The incineration unit includes an incinerator 2, a combustion fan 3, and a waste heat boiler 4 disposed downstream of the incinerator 2. The front part of the incinerator 2 is provided with a first burner 1, chlorine-containing waste liquid and/or chlorine-containing waste gas, such as natural gas, can be fed into the incineration unit via the first burner 1 for oxidative decomposition, and the incineration temperature in the incinerator 2 is not lower than, for example, 1200 ℃. The incinerator 2 adopts a heat-insulating hearth, and the furnace wall is of a two-layer refractory brick structure, wherein the refractory layer is a corundum mullite brick and does not react with hydrogen chloride in smoke. The protective cover is arranged outside the casing of the incinerator 2, an air interlayer is formed between the protective cover and the casing, the design temperature of the casing can be 160 ℃, and acid dew point corrosion of hydrogen chloride can be effectively avoided. The combustion fan 3 is used to provide combustion air to the incinerator 2, and the combustion fan 3 may be in communication with the first burner 1.

The exhaust-heat boiler 4 can convert boiler feed water into hot steam for factories to use by utilizing the heat of the high-temperature flue gas of the incinerator 2. The exhaust-heat boiler 4 can be a horizontal flue-tube boiler. In order to control the generation of dioxin substances and reduce the residence time of the flue gas in the temperature range of 200-500 ℃, the temperature of the high-temperature flue gas can be reduced to 550 ℃ for example after the high-temperature flue gas enters the waste heat boiler 4. The pressure of the steam generated by the waste heat boiler 4 is ensured to be more than 1.3MpaG so as to keep the temperature of the pipe wall to be more than 160 ℃ and avoid dew point corrosion.

The quenching unit is arranged at the downstream of the incineration unit and is communicated with the incineration unit. The quench unit may include a quench tower 5 and a quench reflux unit. The quenching tower 5 can be communicated with the flue gas outlet of the waste heat boiler 4 through a pipeline, so that the flue gas enters the quenching tower 5 for quenching treatment, and impurities in the flue gas are captured by water to purify the flue gas. The water may be desalted water such that a contaminated acid is produced upon quenching. The temperature of the flue gas leaving from the waste heat boiler 4 can be 550 ℃, for example, the flue gas is cooled from 550 ℃ to within 80 ℃ through the quenching tower 5, so that the flue gas containing hydrogen chloride is rapidly cooled, and the generation interval of dioxin is avoided to be 200-500 ℃. The quenching tower 5 adopts a direct contact cooling mode, so that violent contact between gas phase and liquid phase is ensured, and most of dust and the like in the flue gas are removed.

The quenching reflux device is used for refluxing most of the waste acid at the bottom of the quenching tower 5 to the top of the tower, and a part of the waste acid is conveyed to a waste acid storage tank 8 for temporary storage so as to be discharged through a waste acid pump 9. The quench reflux unit may include a quench circulation pump 6 and a quench heat exchanger 7 disposed downstream of the quench circulation pump 6. The quench heat exchanger 7 absorbs and removes the heat of solution of hydrogen chloride dissolved in water by circulating cooling water. The quench tower 5 may be connected to a water supply line to replenish the desalinated water and maintain the liquid level in the tower.

Alternatively, the quenching tower 5 may be a graphite tower and the quenching heat exchanger 7 may be a graphite heat exchanger.

The absorption unit is disposed downstream of the quench unit and is in communication with the quench unit. The absorption unit may include a primary absorption tower 10 and a secondary absorption tower 13 located downstream of the primary absorption tower 10. The primary absorber 10 can be in communication with the flue gas outlet of the quench tower 5 via piping to absorb a substantial portion of the hydrogen chloride in the flue gas with water, such as desalinated water. The flue gas outlet of the primary absorption tower 10 can communicate with the flue gas inlet of the secondary absorption tower 13 via a pipeline to further absorb the remaining hydrogen chloride in the flue gas with water such as desalted water. By the implementation mode, the flue gas can be sequentially subjected to two-stage absorption, and substances such as hydrogen chloride in the flue gas can be removed.

In this embodiment, the flue gas (gas phase) may be in communication with the quench unit, but the liquid (liquid phase) is not. Further, the flue gas in the quenching unit can be conveyed to the absorption unit, but the waste acid in the quenching unit is not conveyed to the absorption unit, and the absorption liquid in the absorption unit is not conveyed to the quenching unit.

Of course, if needed and/or desired, the absorption unit may comprise more than two stages of absorption towers connected in series in order to further absorb hydrogen chloride and purify the flue gas.

The incineration treatment system also comprises a hydrochloric acid recovery unit. The hydrochloric acid recovery unit is disposed downstream of the absorption unit for recovering hydrochloric acid. The hydrochloric acid recovery unit can communicate with the liquid outlet of the primary absorption tower 10 via a pipe, and partially convey the primary absorption liquid to the hydrochloric acid recovery unit. In the present embodiment, the liquid outlet of the secondary absorption tower 13 and the liquid inlet of the primary absorption tower 10 are in overflow communication via a pipeline, that is, are in communication via an overflow pipeline, so as to convey the secondary absorption liquid to the primary absorption tower 10, thereby not only replenishing the liquid in the primary absorption tower 10 and maintaining the amount of liquid in the tower, but also gradually increasing the concentration of hydrogen chloride in the primary absorption liquid. When the concentration of the hydrogen chloride in the primary absorption liquid meets the requirement, for example, the concentration of the hydrogen chloride is about 18-20%, the hydrogen chloride enters a hydrochloric acid recovery unit for recovery treatment, and the byproduct hydrochloric acid is obtained.

In this embodiment, most of impurities such as smoke dust in the flue gas are removed in the quenching treatment, then the hydrogen chloride in the flue gas is absorbed, and the absorption liquid is recycled to obtain hydrochloric acid, so that the impurities are prevented from being mixed into the hydrochloric acid, and the quality of the recycled hydrochloric acid can be improved.

The secondary absorption tower 13 may be connected to a water supply line to replenish the desalinated water and maintain the amount of liquid in the tower. The primary absorption tower 10 and the secondary absorption tower 13 may each be provided with an absorption reflux device for refluxing the absorption liquid at the bottom of the tower to the top of the tower. The first-stage absorption reflux device can reflux most of the first-stage absorption liquid at the bottom of the first-stage absorption tower 10 to the top of the tower, and a part of the first-stage absorption liquid is conveyed to the hydrochloric acid recovery unit, which may include a first-stage absorption circulating pump 11 and a first-stage absorption heat exchanger 12 disposed downstream of the first-stage absorption circulating pump 11. The primary absorption heat exchanger 12 utilizes the circulating cooling water to reduce the temperature of the primary absorption liquid, reduce the partial pressure of the hydrogen chloride in the flue gas and further improve the recovery efficiency of the hydrogen chloride.

The secondary absorption reflux device can reflux most of the secondary absorption liquid at the bottom of the secondary absorption tower 13 to the top of the tower, and may include a secondary absorption circulating pump 14 and a secondary absorption heat exchanger 15 disposed downstream of the secondary absorption circulating pump 14. The primary absorption heat exchanger 12 and the secondary absorption heat exchanger 15 may both be graphite heat exchangers.

Alternatively, the top of the primary absorber column 10 may be provided with a liquid distributor, such as a nozzle, in communication with the primary absorber reflux unit via a line. The middle section can be provided with a packing layer, and the flue gas is fully contacted with the circulating first-stage absorption liquid in the packing layer, in other words, the first-stage absorption tower 10 is a packed tower. The first-stage absorption liquid at the bottom of the tower forms a circulation loop through a first-stage absorption reflux device and a liquid distributor. The second absorption tower 13 is also a packed tower, which has substantially the same structure as the first absorption tower 10, and therefore, the description thereof is omitted for brevity. The secondary absorption tower 13 can form a circulation loop of the secondary absorption liquid.

The hydrochloric acid recovery unit may include a bag filter 19, an activated carbon filter 20, and a decoloring device 21 in series in this order. The primary absorption liquid can be sequentially filtered and decolored in a hydrochloric acid recovery unit to remove suspended matters, free chlorine, partial organic matters and iron ions in the hydrochloric acid, so that the quality of the hydrochloric acid is further improved, and the requirements of the finished acid on the free chlorine and the chromaticity are met. The decolorizing device 21 may be filled with a decolorizing resin, such as a large pore anion exchange resin. Specifically, the first-stage absorption liquid may first enter a bag filter 19 to remove fine particles and suspended solids in the solution, then enter an activated carbon filter 20 to remove a portion of organic matters and free chlorine in the by-product hydrochloric acid to prevent the decolorizing resin from being oxidized, and finally enter a decolorizing device 21 to remove iron ions in the solution to meet various index requirements of the finished hydrochloric acid.

The incineration disposal system may also include a scrubber tower 16. The scrubber 16 can be in communication with the flue gas outlet of the secondary absorption tower 13 via a pipe. The flue gas still contains trace amounts of hydrogen chloride and chlorine after two-stage absorption, and can enter a washing tower 16 to thoroughly remove the trace amounts of hydrogen chloride and chlorine in the flue gas, so that the flue gas emission is ensured to reach the standard.

In the present embodiment, the scrubber 16 has a two-stage structure, which includes an upper scrubber chamber 16a and a lower scrubber chamber 16b arranged above and below, the lower scrubber chamber 16b can be separated from the flue gas outlet of the secondary absorption tower 13, and the upper scrubber chamber 16a and the lower scrubber chamber 16b can be separated by a partition with holes. The lower washing chamber 16b may contain lye and the upper washing chamber 16a may contain water, such as desalinated water. The flue gas can first enter the lower washing chamber 16b for alkaline washing and then enter the lower washing chamber 16b for water washing through the holes on the partition plate. The scrubbing tower 16 adopts a two-stage scrubbing mode to ensure that the hydrogen chloride, chlorine and particulate matters in the scrubbed flue gas meet the emission requirement.

The upper washing chamber 16a is connected with a water supply line for supplying desalted water; the lower washing chamber 16b is connected to an alkali solution supply line for supplying alkali solution. In the illustrated embodiment, the lye supply lines are capable of delivering sodium hydroxide solution and sodium sulfite solution to the lower washing chamber 16 b. The concentration of the sodium hydroxide solution may be, for example, about 10%, and the concentration of the sodium sulfite solution may be, for example, about 10%. The lower washing chamber 16b can maintain a high PH, and remove the remaining trace amounts of hydrogen chloride and chlorine in the flue gas by supplementing with a 10% sodium hydroxide solution and a 10% sodium sulfite solution. The upper washing chamber 16a washes the flue gas after the alkaline washing by supplementing water, and further removes hydrogen chloride from the flue gas.

Upper and lower washing chambers 16a and 16b are provided with overflow means (not shown) to overflow the secondary washing liquid of upper washing chamber 16a to lower washing chamber 16 b. The overflow means may be an overflow pipe extending between upper scrubbing chamber 16a and lower scrubbing chamber 16b, and may be located either within scrubbing tower 16 or outside scrubbing tower 16.

Both the upper washing chamber 16a and the lower washing chamber 16b are provided with a washing backflow device for returning the washing liquid to the ceiling. The scrub reflux device can be, for example, a reflux pump. The top of the lower washing chamber 16b can be provided with a first liquid distributor, such as a nozzle, which is communicated with the first-stage washing circulating pump 17 through a pipeline, the middle part can be provided with a lower packing layer, the flue gas is fully contacted with the circulating first-stage washing liquid in the lower packing layer, and the first-stage washing liquid at the bottom of the chamber forms a circulating loop through the first-stage washing circulating pump 17 and the first liquid distributor. The top of the upper washing chamber 16a can be provided with a second liquid distributor, such as a nozzle, which is communicated with the second-stage washing circulating pump 18 through a pipeline, the middle part can be provided with an upper packing layer, the flue gas is fully contacted with the circulating second-stage washing liquid on the upper packing layer, and the second-stage washing liquid at the bottom of the chamber forms a circulating loop through the second-stage washing circulating pump 18 and the second liquid distributor.

The top of the secondary absorption tower 13 may be provided with a demister for reducing the entrainment of liquid droplets from the flue gas to the scrubber 16. The top of the scrubber 16 may be provided with two stages of demisters for removing liquid droplet particles from the flue gas, thereby reducing the entrainment of liquid droplets from the flue gas to subsequent systems.

The incineration treatment system may further include a heating device 23 and a denitration device 25 which is provided downstream of the washing tower 16 and is packed with a catalyst for removing dioxin and nitrogen oxides. The heating device 23 is provided between the washing tower 16 and the denitration device. The flue gas is heated to a predetermined temperature in the heating device 23 before entering the denitration device, so as to ensure thorough denitration and dioxin removal reaction. A flue gas heat exchanger 22 is arranged on a downstream pipeline of the denitration device 25, flue gas subjected to denitration and dioxin removal enters through a hot fluid inlet of the flue gas heat exchanger 22, and flows out of a hot fluid outlet after heat exchange. With this embodiment, can make full use of the flue gas heat behind the denitrification facility come preheat the flue gas after the washing to improve the waste heat utilization efficiency of system, avoided the wasting of resources.

The cold fluid inlet of the flue gas heat exchanger 22 is communicated with the flue gas outlet of the washing tower 16, and the cold fluid outlet of the flue gas heat exchanger 22 is communicated with the flue gas inlet of the heating device 23. The flue gas exits from the scrubber 16 and is preheated by a flue gas heat exchanger 22 before entering the heating device 23, where it is heated to, for example, about 270 ℃. The heated flue gas enters a denitration device 25 to remove nitrogen oxides and dioxin. The ammonia gas is used as a reducing agent and is mixed with air and then sprayed into the inlet of the denitration device 25. And after the ammonia gas and the flue gas are fully mixed, removing nitric oxide and dioxin under the action of a catalyst. The flue gas from the denitrator 25 is cooled to about 135 ℃ for example by the flue gas heat exchanger 22, and is sent to a chimney 27 by an induced draft fan 26 to be discharged to the atmosphere. The induced draft fan 26 is arranged at the tail end of the whole system, and ensures that the whole flue gas flow path in the system is in a negative pressure operation state, so that toxic and harmful corrosive gas is effectively prevented from leaking into the external environment.

Alternatively, the heating device 23 may be a hot blast stove with a second burner 24. The denitrification facility 25 may be an SCR reactor.

According to another aspect of the present invention, there is provided a method for incineration of waste liquid containing chlorine, the method for incineration treating chlorine-containing waste liquid and/or waste gas using the incineration treatment system according to any one of the above aspects.

Specifically, the incineration treatment method comprises the following steps:

an incineration step of incinerating the waste liquid and/or the exhaust gas to produce a flue gas including hydrogen chloride;

a quenching step, in which the flue gas generated by burning is quenched;

a primary absorption step, namely absorbing hydrogen chloride in the flue gas subjected to quenching treatment to obtain primary absorption liquid;

a secondary absorption step, namely absorbing hydrogen chloride in the flue gas after primary absorption to obtain secondary absorption liquid; and

and a hydrochloric acid recovery step, wherein part of the primary absorption liquid is treated to obtain a byproduct hydrochloric acid.

The incineration treatment method can also comprise a waste heat utilization step, wherein the waste heat utilization step is positioned after the incineration step and before the quenching step, and in the waste heat utilization step, the boiler feed water is converted into saturated steam by using the heat of the flue gas.

In the hydrochloric acid recovery step, bag-type filtration treatment, activated carbon filtration treatment and decoloration treatment are sequentially carried out on the primary absorption liquid to obtain the byproduct hydrochloric acid.

The incineration disposal method also comprises a primary washing step and a secondary washing step. And in the primary washing step, performing alkaline washing on the flue gas after secondary absorption. In the second washing step, the flue gas after the first washing is washed by water.

The incineration treatment method also comprises a denitration step, a heating step and a flue gas heat exchange step. And the denitration step is positioned after the heating step, and dioxin and nitrogen oxide in the flue gas after the secondary washing are removed in the denitration step. The heating step is positioned after the secondary washing step, and in the heating step, the flue gas after the secondary washing is heated; in the flue gas heat exchange step, the flue gas after denitration treatment and the flue gas after secondary washing exchange heat. The flue gas in the heating step is the flue gas after heat exchange.

In the step of quenching, the waste acid in the tower is refluxed; in the first-stage absorption step, refluxing the first-stage absorption liquid in the tower; in the secondary absorption step, the secondary absorption liquid in the tower is refluxed; in the first-stage washing step, the indoor first-stage washing liquid is refluxed; in the secondary washing step, the secondary washing liquid in the chamber is refluxed.

Other technical features of the incineration treatment method are described in the incineration treatment system, and are not described again for the sake of brevity.

The utility model provides an incineration disposal system of chlorine-containing waste gas and waste liquid has adopted waste gas and waste liquid to burn-waste heat recovery-flue gas rapid cooling-flue gas absorption-hydrochloric acid recovery-flue gas washing-flue gas reheat denitration to take off the technological system route of dioxin. According to the technology, toxic and harmful substances in the waste gas and liquid containing chlorine are incinerated at high temperature, the heat of high-temperature flue gas is recovered by waste heat, and the quality of hydrochloric acid recovery is improved by adopting a mode of separating flue gas quenching and hydrochloric acid recovery.

And suspended matters, partial organic matters, free chlorine and iron ions in hydrochloric acid are removed by the bag filter, the activated carbon filter and the decoloring device, so that the requirements of finished hydrochloric acid on free chlorine and chromaticity are met.

And a two-stage washing mode is arranged to ensure that the hydrogen chloride, chlorine and particulate matters in the washed flue gas meet the emission requirement.

The mode of denitration and dioxin removal after flue gas reheating meets the environment-friendly emission requirements of nitrogen oxides and dioxin, and meanwhile, a flue gas heat exchanger is arranged to reduce the energy consumption of the system.

The steps of the method of the embodiment of the present invention can be adjusted, combined or deleted according to actual needs.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "part," "member," and the like, when used herein, can refer to either a single part or a combination of parts. Terms such as "mounted," "disposed," and the like, as used herein, may refer to one component as being directly attached to another component or one component as being attached to another component through intervening components. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that many more modifications and variations can be made in accordance with the teachings of the present invention, all of which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. An incineration disposal system for chlorine-containing waste gas and waste liquid, which is used for incinerating chlorine-containing waste liquid and/or waste gas, and is characterized by comprising:

an incineration unit for incinerating the waste liquid and/or the exhaust gas to produce a flue gas including hydrogen chloride;

the quenching unit is used for quenching the flue gas from the incineration unit, is arranged at the downstream of the incineration unit and is communicated with the incineration unit;

the absorption unit is used for absorbing hydrogen chloride in the flue gas from the quenching unit, is arranged at the downstream of the quenching unit and is communicated with the quenching unit;

a hydrochloric acid recovery unit disposed downstream of the absorption unit,

the absorption unit comprises a first-stage absorption tower and a second-stage absorption tower located at the downstream of the first-stage absorption tower, a smoke outlet of the first-stage absorption tower is communicated with a smoke inlet of the second-stage absorption tower, a liquid outlet of the second-stage absorption tower is communicated with a liquid inlet of the first-stage absorption tower through overflow so as to convey a second-stage absorption liquid to the first-stage absorption tower, and the first-stage absorption tower is communicated with the hydrochloric acid recovery unit so as to partially convey the first-stage absorption liquid to the hydrochloric acid recovery unit.

2. The incineration disposal system of claim 1, wherein the hydrochloric acid recovery unit comprises a bag filter, an activated carbon filter and a decolorizing device connected in series in this order.

3. The incineration treatment system of claim 1, further comprising a scrubber tower in communication with the flue gas outlet of the secondary absorption tower, the scrubber tower comprising an upper scrubber chamber and a lower scrubber chamber, the upper scrubber chamber being spaced apart from the lower scrubber chamber via a perforated partition.

4. The incineration disposal system of claim 3,

the upper washing chamber is connected with a water supply pipeline; and is

The lower washing chamber is connected with an alkali liquor supply pipeline.

5. The incineration disposal system of claim 3, wherein the upper washing chamber and the lower washing chamber are provided with overflow means to overflow the secondary washing liquid of the upper washing chamber to the lower washing chamber.

6. The incineration disposal system of claim 3, wherein each of the upper washing chamber and the lower washing chamber is provided with a washing backflow device for returning washing liquid to a roof.

7. The incineration disposal system according to claim 1, wherein the primary absorption tower and the secondary absorption tower are each provided with an absorption reflux device for refluxing an absorption liquid at a bottom of the tower to a top of the tower.

8. The incineration disposal system of claim 1, wherein the quenching unit comprises a quenching tower and a quenching reflux device, the quenching reflux device is used for refluxing the bottom waste acid of the quenching tower to the top of the tower, and the quenching tower is connected with a water supply pipeline.

9. The incineration treatment system according to claim 3, further comprising a denitration device disposed downstream of the scrubber, the denitration device being packed with a catalyst for removing dioxin and nitrogen oxides.

10. The incineration treatment system according to claim 9, further comprising a heating device disposed between the washing tower and the denitration device, wherein a flue gas heat exchanger is disposed on a downstream pipeline of the denitration device, a cold fluid inlet of the flue gas heat exchanger is communicated with a flue gas outlet of the washing tower, and a cold fluid outlet of the flue gas heat exchanger is communicated with a flue gas inlet of the heating device.

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