CN219072544U - HCl circulation processing device - Google Patents
HCl circulation processing device Download PDFInfo
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- CN219072544U CN219072544U CN202223474071.4U CN202223474071U CN219072544U CN 219072544 U CN219072544 U CN 219072544U CN 202223474071 U CN202223474071 U CN 202223474071U CN 219072544 U CN219072544 U CN 219072544U
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Abstract
The utility model discloses an HCl circulation treatment device. The device comprises a cooling device, a heat exchanger and a heat exchanger, wherein the cooling device is used for cooling first flue gas generated after incineration and inhibiting regeneration of dioxin; the dust removing device is used for removing dust from the cooled first flue gas to form second flue gas; and the second flue gas enters the falling film absorption device to be treated to generate low-temperature hydrochloric acid. The low-temperature hydrochloric acid is conveyed to the cooling device through the first circulating system as a cooling medium, sprayed out from a spraying nozzle of the cooling device, and directly mixed with the first flue gas to cool the first flue gas. The utility model skillfully utilizes the low-temperature hydrochloric acid of the hydrochloric acid output pipeline of the falling film absorption device as a cooling medium for spraying of the quenching tower, avoids the low concentration of the hydrochloric acid formed by absorbing CI in the first flue gas by adopting water as the cooling medium in the prior art, and increases the load of the subsequent falling film absorption device. In the quenching step (dioxin suppression), the problem of increasing the recovery concentration of hydrochloric acid is considered, and the coordination between the entire steps is improved.
Description
Technical Field
The utility model belongs to the technical field of environmental protection, in particular to a waste liquid and waste liquid incineration technology, and particularly relates to an HCl circulation treatment technology in high-chlorine-content waste liquid incineration.
Background
Waste solutions containing high concentrations of Cl, S, N, such as those generated during the sucralose production process, typically contain relatively high concentrations of Cl, S, N elements. The Cl content is usually up to 20% or more. CI produced during incineration forms hydrochloric acid during purification. The existing treatment of hydrochloric acid involves neutralization by means of a base. In the deacidification process, not only CI but also S is required to be removed, so that in equipment load, naOH is required to be mixed to be higher than the mole ratio of a plurality of times of a reaction formula, and the generated ash is changed from single NaCl to NaCl and Na 2 CO 3 、NaOH、Na 2 O, the ash amount and the ash types are increased, and the ash melting point is reduced; the generated large amount of alkali ash is in a molten state in a high-temperature area, so that a slag outlet is not easy to block, a dense heating surface is easy to be bonded and stained, and serious ash accumulation cannot be operated; the molten alkali ash has serious corrosion to refractory castable and needs to be replaced in a short time, thus increasing the running cost; the corrosion rate of the alkali ash to the heating surface is higher, and the replacement period of the heating surface pipe is shorter.
The prior art also comprises recycling of HCI, which adopts falling film absorption to prepare hydrochloric acid for recycling hydrochloric acid in a single cycle, and in the whole high-chlorine waste liquid incineration process, the coordination among other treatment devices is not high, so that the hydrochloric acid recycling concentration of the device is low.
Disclosure of Invention
The utility model aims to provide an HCl circulation treatment device, which overcomes the defects of low treatment efficiency of devices in the prior art, improves coordination of a high-chlorine waste liquid treatment system and can be an HCl circulation treatment device after high-chlorine waste liquid is burnt.
The technical scheme of the utility model is as follows: an HCl cyclic treatment device, comprising:
the cooling device is used for cooling the first flue gas generated after incineration and inhibiting regeneration of dioxin;
the dust removing device is used for removing dust from the cooled first flue gas to form second flue gas;
and the second flue gas enters the falling film absorption device to be treated to generate low-temperature hydrochloric acid and third flue gas, the low-temperature hydrochloric acid is conveyed to the cooling device through the first circulating system as a cooling medium, and is sprayed out from a spraying nozzle of the cooling device to be directly mixed with the first flue gas to cool the first flue gas.
The temperature of hydrochloric acid generated by a falling film absorption device in the device is 40-80 ℃, and the hydrochloric acid flows back to a spray nozzle of a cooling device through a first circulation system to be sprayed out, so that a large circulation or an external circulation is formed; the first flue gas entering the cooling device is sprayed and mixed as cooling medium, and the first flue gas at 450-550 ℃ is cooled and rapidly cooled. The temperature of the first flue gas is 180-220 ℃. CI contained in the first flue gas is absorbed by hydrochloric acid, on one hand, the CI contained in the first flue gas is absorbed, on the other hand, the concentration of hydrochloric acid is improved, the load of the subsequent falling film absorption device for treating hydrochloric acid is reduced, and the treatment efficiency of the falling film absorption device is improved, so that hydrochloric acid with higher concentration is generated.
After the recycle hydrochloric acid in the flue gas is treated, the subsequent alkaline washing tower mainly treats S in the flue gas and a small amount of CI, the load of the alkaline washing tower is small, the treatment of S in the flue gas is more thorough, and the purification effect of the waste liquid treatment effect of high content of CI and S is better.
The further optimization scheme comprises the following steps: the first circulating system comprises a hydrochloric acid storage container which is connected and communicated with the hydrochloric acid discharge port of the falling film absorption tower, the hydrochloric acid storage container is connected and communicated with a first hydrochloric acid circulating pump, and the first hydrochloric acid circulating pump is connected and communicated with a spray pipeline of the cooling device.
The hydrochloric acid storage container is arranged as the transit of the large circulation, and the hydrochloric acid temporarily stored in the hydrochloric acid storage container can realize the spray cooling of the cooling device in the waste liquid incineration initial stage. Of course, for the waste liquid incineration initiation stage, the hydrochloric acid temperature in the hydrochloric acid storage container is lower than, but not limited to, the circulation temperature generated by the falling film absorption device, for example, the hydrochloric acid temperature in the hydrochloric acid storage container is room temperature.
The further optimization scheme comprises the following steps: the cooling device comprises a quenching tower, wherein a cooling medium spray pipe system in the quenching tower is connected and communicated with the first circulating system, and the quenching tower is used for reducing the temperature of the first entering flue gas to a regeneration temperature range for inhibiting dioxin.
The first flue gas with the temperature of 450-550 ℃ enters a quenching tower, and the quenching tower quenches the flue gas for 1s to 180-220 ℃ (for example, the temperature can be controlled at 200 ℃). For large circulation hydrochloric acid, the temperature of the recovered hydrochloric acid entering the quenching tower is 40-80 ℃, particularly 50-65 ℃.
The further optimization scheme comprises the following steps: the low-temperature hydrochloric acid discharge port generated by the falling film absorption tower treatment is also connected with a second circulating system, the second circulating system comprises a second hydrochloric acid circulating pump, and the output of the second hydrochloric acid circulating pump is connected with the input end of the falling film absorption tower. The second cycle is the small (inner) cycle of hydrochloric acid. On the basis of the first circulation, a second circulation is added, namely, on the basis of a large (outer) circulation, a small (inner) circulation and an inner and outer circulation are added to perform combined action, so that the treatment capacity and efficiency of the falling film absorption tower are greatly improved, and the recovered industrial hydrochloric acid with the concentration of not less than 31% can be realized by adopting one falling film absorption tower.
The further optimization scheme comprises the following steps: the input end of the second hydrochloric acid circulating pump is connected with the hydrochloric acid storage container. The internal and external circulation are transferred through the hydrochloric acid storage container, so that the control and adjustment of the internal and external circulation can be conveniently realized, and the proportion of the hydrochloric acid in the internal and external circulation is coordinated.
The further optimization scheme comprises the following steps: the hydrochloric acid storage container is provided with at least three hydrochloric acid output pipes. The first hydrochloric acid output pipe is connected with a first hydrochloric acid circulating pump which circulates outside and is connected and communicated with a plurality of spray guns of the quenching tower device through a pipeline system; the second hydrochloric acid output pipe is connected with a second hydrochloric acid circulating pump communicated with the internal circulation, and the second hydrochloric acid circulating pump is connected and communicated with a hydrochloric acid internal circulation inlet pipe at the upper part of the falling film absorption tower through a pipeline system; the third hydrochloric acid output pipe is a recovered hydrochloric acid discharge pipe and is connected and communicated with the hydrochloric acid discharge pump.
The utility model has the characteristics that the utility model further comprises an inner circulation based on the outer circulation to form an outer and inner double-circulation hydrochloric acid treatment and recovery device. The low-temperature hydrochloric acid of the hydrochloric acid output pipeline of the falling film absorption device is ingeniously used as a cooling medium sprayed by the quenching tower, so that the problem that the concentration of the hydrochloric acid formed by absorbing CI in the first flue gas by using water as the cooling medium in the prior art is low is avoided, and the load of the subsequent falling film absorption device is increased. In the quenching step (dioxin suppression), the problem of increasing the recovery concentration of hydrochloric acid is considered, and the coordination between the entire steps is improved. The combined action of internal and external circulation greatly improves the processing capacity and efficiency of the falling film absorption tower, and the recovered industrial hydrochloric acid with the concentration not lower than 31% can be realized by adopting one falling film absorption tower. And removing dust in the flue gas, then recycling hydrochloric acid in the falling film absorption tower, and avoiding the dust in the flue gas from blocking the falling film absorption tower.
Drawings
FIG. 1 is a schematic diagram of the HCl recycling process apparatus of the present utility model.
Detailed Description
The following detailed description is presented to explain the claimed utility model and to enable those skilled in the art to understand the claimed utility model. The scope of the utility model is not limited to the following specific embodiments. It is also within the scope of the utility model to include the claims of the present utility model as made by those skilled in the art, rather than the following detailed description.
As shown in fig. 1, the HCl circulation treatment device used after incineration of the high-chlorine waste liquid is a system for incinerating and purifying the sucralose waste liquid in the example, and of course, the system is not limited to the system for incinerating and purifying the sucralose waste liquid. Embodiments are part of the above described system.
After passing through a waste heat recovery system (a preheating recovery boiler system), the first flue gas generated by burning the sucralose waste liquid by an incineration system enters a quenching tower device which comprises a quenching tower body 16 and a quenching tower spray gun 17. A plurality of quenching tower spray guns 17 are arranged at intervals along the circumferential direction of the inlet of the quenching tower, a double-medium fluid structure is adopted, the spray gun atomization effect is good, the high-temperature flue gas at 500-530 ℃ is reduced to 180-220 ℃ for 1s, and the flue gas stays in the quenching tower for enough time. The quench tower wall includes an outer wall made of carbon steel and an inner liner made of an acid and temperature resistant material. The input of the cooling medium of the quenching tower spray gun 17 is connected with a large circulation device of hydrochloric acid. Hydrochloric acid is used as a cooling medium.
The second cooled first flue gas from the quench tower assembly is coupled to a communicating dioxin adsorption injection device on the output flue, and in one embodiment activated carbon is used as the adsorbent. The first flue gas is connected to a communicating activated carbon injection device 18 on the output flue.
The first flue gas is formed by an activated carbon injection device 18 and is connected to a communication dust collector 19 by a flue, which may be, but is not limited to, a bag type dust collector. The second flue gas connection from the dust separator 19 is communicated to a HCl recovery hydrochloric acid plant, in embodiments employing, but not limited to, a falling film absorber 21. The falling film absorption tower 21 is provided with a hydrochloric acid internal circulation inlet pipe, and the lower part of the falling film absorption tower 21 is provided with a hydrochloric acid discharge pipe. The generated dust of the dust remover is collected and transported away by the dust transporting device 20.
The hydrochloric acid discharge pipe connects the second circulation device (inner circulation device) and the first circulation device (outer circulation device) of hydrochloric acid. The first circulation device (external circulation device) connects and communicates low-temperature hydrochloric acid generated by the falling film absorption tower as a cooling medium with a plurality of quenching tower spray guns 17 of the quenching tower device, rapidly cools the first flue gas entering the falling film absorption tower, absorbs CI in the first flue gas, and simultaneously improves the concentration of hydrochloric acid entering the falling film absorption tower 21. The second circulating device (internal circulating device) connects and communicates the generation of the falling film absorption tower with the hydrochloric acid internal circulating inlet pipe at the upper part of the falling film absorption tower 21 to form circulating treatment.
In one embodiment, the first circulation device and the second circulation device each comprise a hydrochloric acid storage tank 22. The hydrochloric acid discharge pipe is connected to communicate with a hydrochloric acid storage tank 22 (hydrochloric acid storage container). The hydrochloric acid storage tank 22 is provided with at least three hydrochloric acid output pipes. The first hydrochloric acid output pipe is connected with an externally-circulated hydrochloric acid reflux pump 24 (also called a first hydrochloric acid circulating pump), and the hydrochloric acid reflux pump 24 is connected and communicated with a plurality of quenching tower spray guns 17 of the quenching tower device through a pipeline system. The second hydrochloric acid output pipe is connected with a hydrochloric acid circulating pump 23 (also called a second hydrochloric acid circulating pump) communicated with the internal circulation, and the hydrochloric acid reflux pump 23 is connected and communicated with a hydrochloric acid internal circulation inlet pipe at the upper part of the falling film absorption tower 21 through a pipeline system. The third hydrochloric acid output pipe is a recovered hydrochloric acid discharge pipe and is connected and communicated with the hydrochloric acid discharge pump 25.
The double-circulation structural design has the advantages of less equipment quantity, reduced occupied space, small operation load of the falling film absorption tower and high efficiency. Can realize that one device realizes the industrial hydrochloric acid with the concentration of recovered hydrochloric acid not lower than 31 percent.
Claims (6)
1. An HCl cyclic processing device, comprising:
the cooling device is used for cooling the first flue gas generated after incineration and inhibiting regeneration of dioxin;
the dust removing device is used for removing dust from the cooled first flue gas to form second flue gas;
and the second flue gas enters the falling film absorption device to be treated to generate low-temperature hydrochloric acid and third flue gas, the low-temperature hydrochloric acid is conveyed to the cooling device through the first circulating system as a cooling medium, and is sprayed out from a spraying nozzle of the cooling device to be directly mixed with the first flue gas to cool the first flue gas.
2. The HCl circulation treatment device of claim 1, wherein: the first circulating system comprises a hydrochloric acid storage container which is connected and communicated with the hydrochloric acid discharge port of the falling film absorption tower, the hydrochloric acid storage container is connected and communicated with a first hydrochloric acid circulating pump, and the first hydrochloric acid circulating pump is connected and communicated with a spray pipeline of the cooling device.
3. The HCl circulation treatment device according to claim 1 or 2, wherein: the cooling device comprises a quenching tower, wherein a cooling medium spray pipe system in the quenching tower is connected and communicated with the first circulating system, and the quenching tower is used for reducing the temperature of the first entering flue gas to a regeneration temperature range for inhibiting dioxin.
4. The HCl circulation treatment device according to claim 1 or 2, wherein: the low-temperature hydrochloric acid discharge port generated by the falling film absorption tower treatment is also connected with a second circulating system, the second circulating system comprises a second hydrochloric acid circulating pump, and the output of the second hydrochloric acid circulating pump is connected with the input end of the falling film absorption tower.
5. The HCl circulation treatment device of claim 4, wherein: the input end of the second hydrochloric acid circulating pump is connected with the hydrochloric acid storage container.
6. The HCl circulation treatment device of claim 4, wherein: the hydrochloric acid storage container is provided with at least three hydrochloric acid output pipes, the first hydrochloric acid output pipe is connected with a first hydrochloric acid circulating pump which circulates outside, and the first hydrochloric acid circulating pump is connected and communicated with a plurality of spray guns of the quenching tower device through a pipeline system; the second hydrochloric acid output pipe is connected with a second hydrochloric acid circulating pump communicated with the internal circulation, and the second hydrochloric acid circulating pump is connected and communicated with a hydrochloric acid internal circulation inlet pipe at the upper part of the falling film absorption tower through a pipeline system; the third hydrochloric acid output pipe is a recovered hydrochloric acid discharge pipe and is connected and communicated with the hydrochloric acid discharge pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223474071.4U CN219072544U (en) | 2022-12-26 | 2022-12-26 | HCl circulation processing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223474071.4U CN219072544U (en) | 2022-12-26 | 2022-12-26 | HCl circulation processing device |
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| CN219072544U true CN219072544U (en) | 2023-05-26 |
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| CN202223474071.4U Active CN219072544U (en) | 2022-12-26 | 2022-12-26 | HCl circulation processing device |
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