Waste gas purification treatment system for chloroacetone production

Abstract

The utility model discloses a waste gas purification treatment system for chloroacetone production, which belongs to the field of waste gas treatment and comprises a waste gas header pipe, a waste gas branch pipe, at least two adsorption towers, a steam inlet pipe, a compressed air inlet pipe and a cooling water tank. The steam inlet pipe is used for feeding hot steam into the adsorption tower, the compressed air inlet pipe is used for feeding compressed air into the adsorption tower to cool an adsorption medium, the cooling water tank is connected with a cooling water inlet of the adsorption tower through a cooling water inlet pipe, and the adsorption tower is further connected with the cooling water tank through a cooling water outlet pipe. The waste gas purification treatment system disclosed by the utility model not only can adsorb chloroacetone in waste gas, so that the waste gas reaches the standard and is discharged after being purified, but also can be switched to another adsorption tower for adsorption and purification after one adsorption tower is saturated in adsorption, so that the continuous purification treatment of the waste gas is realized; the adsorption medium in the adsorption tower can be subjected to thermal desorption regeneration and does not need to be replaced, so that the cost is saved.

Description

Technical Field

[0001] The utility model belongs to the field of waste gas treatment, in particular to a waste gas purification treatment system for chloroacetone production. Background Art

[0002] Chloroacetone, also known as monochloroacetone and chlorinated acetone, is an important organic compound.

[0003] Due to the thermal instability of chloroacetone aqueous solution, negative pressure distillation is often used to purify chloroacetone in production. The use of vacuum pumps inevitably produces a large amount of non-condensable gas after the vacuum pump. This non-condensable gas contains a certain amount of chloroacetone organic matter. Direct discharge will cause certain pollution to the environment and needs to be purified before discharge. Utility Model Content

[0004] The technical problem to be solved by the utility model is the problem that direct discharge of chloroacetone waste gas causes pollution to the environment. A waste gas purification and treatment system for chloroacetone production is proposed, which purifies the chloroacetone waste gas to meet the standards before discharging it.

[0005] In order to solve the above technical problems, the utility model provides a waste gas purification and treatment system for chloroacetone production, comprising a waste gas main pipe connected to at least two waste gas branch pipes, each of which is provided with a sub-control valve, and further comprising:

[0006] At least two adsorption towers, each containing an adsorption medium, having an exhaust gas inlet at the bottom, an exhaust gas outlet, an air inlet, and a cooling water inlet at the top, the exhaust gas inlet of the adsorption tower being connected to an exhaust gas branch pipe, the exhaust gas outlet at the top of the adsorption tower being connected to an exhaust gas discharge pipe, and a discharge valve being provided on the exhaust gas discharge pipe;

[0007] The steam inlet pipe is connected to the air inlet of the adsorption tower and is used to supply hot steam to the adsorption tower. The steam inlet pipe is provided with a steam inlet valve. The adsorption tower is also connected to the steam outlet pipe, and the steam outlet pipe is provided with a steam exhaust valve.

[0008] The compressed air inlet pipe is connected to the air inlet of the adsorption tower and is used to supply compressed air into the adsorption tower to cool the adsorption medium. An air inlet valve is provided on the compressed air inlet pipe;

[0009] The cooling water tank is connected to the cooling water inlet of the adsorption tower through a cooling water inlet pipe. A cooling water inlet valve and a circulation pump are provided on the cooling water inlet pipe. The adsorption tower is also connected to the cooling water tank through a cooling water outlet pipe. A cooling water outlet valve is provided on the cooling water outlet pipe.

[0010] As a further description of the above technical solution, a main control valve is provided on the exhaust gas main pipe.

[0011] As a further description of the above technical solution, the steam outlet pipe is connected to the condenser, the condenser is connected to the condensate tank, and the condensate tank is connected to the recovery pipe for condensing and recovering the chloroacetone carried in the steam.

[0012] As a further description of the above technical solution, a VOCs concentration sensor is also provided on the exhaust pipe, which can monitor whether the VOCs content of the exhaust gas in the exhaust pipe meets the standard (≤20ppm) at all times. When the VOCs content is lower than 20ppm, it can be discharged. When the VOCs content reaches or exceeds 20ppm, it means that the adsorption tower in use cannot continue to be used and needs to be switched to another adsorption tower for adsorption.

[0013] Exhaust gas containing chloroacetone enters one of the adsorption towers through the exhaust main and branch pipes. After the chloroacetone in the exhaust is adsorbed by the adsorption medium, clean exhaust gas is discharged, meeting emission standards. As adsorption progresses, the chloroacetone accumulates in the adsorption medium. When the VOC concentration in the exhaust pipe reaches approximately 20 ppm, adsorption is switched to the next adsorption tower, and the adsorption tower that has adsorbed exhaust gas is regenerated. At this point, the sub-control valve on the exhaust branch pipe of the adsorption tower is closed, and the steam inlet valve on the steam inlet pipe is opened. Steam enters the adsorption tower through the steam inlet pipe from the top of the adsorption tower. The chloroacetone adsorbed by the adsorption medium is desorbed from the adsorption medium by the high-temperature steam. The chloroacetone is condensed in the condenser along with the steam and then flows into the condensate tank for recovery through the recovery pipe. Compressed air is then introduced into the adsorption tower through the compressed air inlet pipe to cool the adsorption medium. When the compressed air is discharged through the adsorption tower, it may contain a small amount of organic matter. To protect the environment, the sub-control valve at the bottom of the adsorption tower and the sub-control valve of the other adsorption tower are opened. The compressed air containing a small amount of organic matter is discharged into the other adsorption tower through the exhaust gas branch pipe for adsorption treatment, and is not directly discharged. Finally, cooling water is used to cool the adsorption medium again. The cooling water enters the adsorption tower through a circulation pump and is then discharged back to the cooling water tank for recycling. At this point, the adsorption medium in the adsorption tower is regenerated and can be used again as a backup adsorption tower.

[0014] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0015] The waste gas purification treatment system for chloroacetone production of the utility model can not only adsorb chloroacetone in the waste gas so that the waste gas meets the emission standards after purification treatment, but also can switch to another adsorption tower for adsorption purification after adsorption saturation in one adsorption tower, thereby realizing continuous and uninterrupted purification treatment of the waste gas, coordinating with the production process, and eliminating the need to stop production; the adsorption medium in the adsorption tower can be desorbed and regenerated by steam heating, and can be reused after being cooled by compressed air and cooling water, without the need to replace the adsorption medium, thereby saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural diagram of the waste gas purification treatment system for chloroacetone production.

[0017] Legend:

[0018] 1A, 1B - Adsorption tower; 2 - Condenser; 3 - Condensate tank; 4 - Cooling water tank; 10 - Exhaust gas main pipe; 10A, 10B - Exhaust gas branch pipe; 11 - Main control valve; 12A, 12B - Sub-control valve; 20 - Exhaust gas pipe; 21 - Exhaust valve; 22 - VOCs concentration sensor; 30 - Steam inlet pipe; 31 - Steam inlet valve; 40 - Steam outlet pipe; 41 - Exhaust valve; 50 - Recovery pipe; 60 - Compressed air inlet pipe; 61 - Air inlet valve; 70 - Cooling water inlet pipe; 71 - Cooling water inlet valve; 72 - Circulating pump; 80 - Cooling water outlet pipe; 81 - Cooling water outlet valve; DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] This embodiment provides a waste gas purification system for chloroacetone production, such as Figure 1 As shown, it includes an exhaust main pipe 10, which is connected to two exhaust branch pipes 10A and 10B. The exhaust main pipe 10 is provided with a main control valve 11, the exhaust branch pipe 10A is provided with a sub-control valve 12A, and the exhaust branch pipe 10B is provided with a sub-control valve 12B. It also includes:

[0021] Two adsorption towers 1A and 1B, with adsorption medium provided in the adsorption towers 1A and 1B, exhaust gas inlets provided at the bottom of the adsorption towers 1A and 1B, exhaust gas outlets, air inlets and cooling water inlets provided at the tops, the exhaust gas inlet of the adsorption tower 1A being connected to the exhaust gas branch pipe 10A, the exhaust gas inlet of the adsorption tower 1B being connected to the exhaust gas branch pipe 10B, the exhaust gas outlets at the tops of the adsorption towers 1A and 1B being connected to the exhaust gas discharge pipe 20, a discharge valve 21 and a VOCs concentration sensor 22 being provided on the exhaust gas discharge pipe 20, which can monitor whether the VOCs content of the exhaust gas in the exhaust gas discharge pipe 20 is up to standard (≤20ppm), when the VOCs content is lower than 20ppm, the discharge valve 21 is opened for standard discharge, and when the VOCs content reaches or exceeds 20ppm, it indicates that the adsorption tower being used cannot be used any longer and needs to be switched to another adsorption tower for adsorption;

[0022] A steam inlet pipe 30 is connected to the air inlets of the adsorption towers 1A and 1B, respectively, for supplying hot steam into the adsorption towers 1A and 1B. A steam inlet valve 31 is provided on the steam inlet pipe 30. The adsorption towers 1A and 1B are also connected to a steam outlet pipe 40. The steam outlet pipe 40 is provided with a steam exhaust valve 41. The steam outlet pipe 40 is connected to the condenser 2, the condenser 2 is connected to the condensate tank 3, and the condensate tank 3 is connected to the recovery pipe 50 for condensing and recovering chloroacetone carried in the steam.

[0023] A compressed air inlet pipe 60 is connected to the air inlets of the adsorption towers 1A and 1B respectively, and is used to introduce compressed air into the adsorption towers 1A and 1B to cool the adsorption medium. An air inlet valve 61 is provided on the compressed air inlet pipe 60;

[0024] Cooling water tank 4, cooling water tank 4 is connected to the cooling water inlets of adsorption towers 1A and 1B respectively through cooling water inlet pipe 70, cooling water inlet pipe 70 is provided with cooling water inlet valve 71 and circulation pump 72, adsorption towers 1A and 1B are also connected to cooling water tank 4 through cooling water outlet pipe 80, cooling water outlet pipe 80 is provided with cooling water outlet valve 81.

[0025] This embodiment is described by taking adsorption tank 1A for regeneration and adsorption tank 1B for adsorption as an example:

[0026] Adsorption Purification: Main control valve 11 and sub-control valve 12A are opened, allowing chloroacetone-containing waste gas to enter adsorption tower 1A through exhaust main pipe 10 and exhaust branch pipe 10A. The chloroacetone in the waste gas is adsorbed by the adsorption medium within adsorption tower 1A, resulting in clean exhaust gas that meets emission standards. As adsorption proceeds, chloroacetone accumulates in the adsorption medium. When the VOC concentration in the exhaust pipe reaches approximately 20 ppm, sub-control valve 12A is closed and sub-control valve 12B is opened, switching to adsorption tower 1B for continued adsorption. Adsorption tower 1A, which has already adsorbed waste gas, is regenerated. Steam inlet valve 31 on steam inlet pipe 30 is opened, allowing steam to enter adsorption tower 1A from the top of the adsorption tower 1A. Chloroacetone adsorbed by the adsorption medium is desorbed from the adsorption medium by the high-temperature steam. The chloroacetone is then condensed in condenser 2 and discharged into condensate tank 3, where it is subsequently recovered through recovery pipe 50. In adsorption tower 1A, feed compressed air by compressed air inlet pipe 60 then, give adsorption medium cooling, compressed air may contain a small amount of organic matter when adsorption tower 1A is discharged, for environmental protection, open the branch control valve 12A bottom adsorption tower 1A and the branch control valve 12B of adsorption tower 1B, the compressed air that contains a small amount of organic matter enters the adsorption tower 1B through waste gas branch pipe 12A, 12B and carries out adsorption treatment, not directly discharged.Finally, cooling water is once again cooled the adsorption medium in the adsorption tower 1A, cooling water enters in the adsorption tower 1A by recycle pump 72, and draining is got back to cooling water tank 4 again, recycles, and adsorption medium regeneration is completed in the adsorption tower 1A so far, can be used as standby adsorption tower and reuse.Two adsorption towers (also can be a plurality of adsorption towers) of whole process recycle, do not need to stop production, and adsorption medium can be regenerated, do not need to change adsorption medium, save replacement time and adsorbent cost.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the scope of protection of the present invention.

Claims

1. A waste gas purification system for chloroacetone production, comprising a waste gas main pipe connected to at least two waste gas branch pipes, each of which is provided with a sub-control valve, characterized in that: Also includes: At least two adsorption towers, each containing an adsorption medium, having an exhaust gas inlet at the bottom, an exhaust gas outlet, an air inlet, and a cooling water inlet at the top, the exhaust gas inlet of the adsorption tower being connected to an exhaust gas branch pipe, the exhaust gas outlet at the top of the adsorption tower being connected to an exhaust gas discharge pipe, and a discharge valve being provided on the exhaust gas discharge pipe; The steam inlet pipe is connected to the air inlet of the adsorption tower and is used to supply hot steam to the adsorption tower. The steam inlet pipe is provided with a steam inlet valve. The adsorption tower is also connected to the steam outlet pipe, and the steam outlet pipe is provided with a steam exhaust valve. The compressed air inlet pipe is connected to the air inlet of the adsorption tower and is used to supply compressed air into the adsorption tower to cool the adsorption medium. An air inlet valve is provided on the compressed air inlet pipe; The cooling water tank is connected to the cooling water inlet of the adsorption tower through a cooling water inlet pipe. A cooling water inlet valve and a circulation pump are provided on the cooling water inlet pipe. The adsorption tower is also connected to the cooling water tank through a cooling water outlet pipe. A cooling water outlet valve is provided on the cooling water outlet pipe.

2. The waste gas purification system for chloroacetone production according to claim 1, wherein: A main control valve is provided on the exhaust main pipe.

3. The waste gas purification system for chloroacetone production according to claim 1 or 2, characterized in that: The steam outlet pipe is connected to the condenser.

4. The waste gas purification system for chloroacetone production according to claim 3, characterized in that: The condenser is connected to the condensate tank, and the condensate tank is connected to the recovery pipe.

5. The waste gas purification system for chloroacetone production according to claim 1 or 2, characterized in that: A VOCs concentration sensor is also provided on the exhaust pipe.

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