Styrene-containing waste gas treatment system

Abstract

The utility model relates to the technical field of styrene-containing waste gas treatment, and particularly discloses a styrene-containing waste gas treatment system which comprises a polymer polyol device and a POSM device, the polymer polyol device and the POSM device are both connected with a three-stage refrigerating system through a first pipeline, the three-stage refrigerating system is connected with an activated carbon adsorption system through a fourth pipeline, and the activated carbon adsorption system is connected with a second pipeline. The activated carbon adsorption system is connected with the styrene recovery treatment system through a fifth pipeline, the styrene recovery treatment system is connected with the third-stage refrigeration system and a second pipeline through a third pipeline, and the second pipeline is respectively connected with the polymer polyol device and the POSM device. The system adopts a three-stage condensation and activated carbon adsorption treatment process, condensation residual gas of the third stage returns to the front heat exchanger in front of the first stage, cold energy is recycled, oil gas entering the oil gas recovery treatment device is pre-cooled, the energy-saving effect is achieved, activated carbon adsorption is adopted, the application range is wide, the treatment effect is good, useful materials can be recycled, and an adsorbent can be repeatedly used.

Description

TECHNICAL FIELD

[0001] The utility model relates to styrene containing waste gas treatment technical field, concretely is a kind of styrene containing waste gas's processing system. BACKGROUND

[0002] The treatment mode of the waste gas of current POSM device (propylene oxide styrene combined production device) and / or the waste gas of polymer polyol device is basically all single incineration treatment, and the existing processing method is simple but high in cost, and the additional value in it is not recycled and utilized, waste resources, also bring great influence to environmental pollution, there is no processing system for separately recycling and treating waste gas containing styrene in market, and therefore a kind of styrene containing waste gas's processing system is provided. SUMMARY

[0003] The utility model discloses to the defects of prior art, provide a kind of styrene containing waste gas's processing system, to solve the problems in the above background art.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of styrene containing waste gas's processing system, including polymer polyol device and POSM device, the polymer polyol device and POSM device are connected with three-level refrigeration system by first pipeline, the three-level refrigeration system is connected with activated carbon adsorption system by fourth pipeline, the activated carbon adsorption system is connected with styrene recycling treatment system by fifth pipeline, the styrene recycling treatment system is connected with three-level refrigeration system and second pipeline by third pipeline, the second pipeline is connected with polymer polyol device and POSM device respectively.

[0005] As a preferred technical scheme of the utility model, the first pipeline is equipped with waste gas flow regulating valve group.

[0006] As a preferred technical scheme of the utility model, the activated carbon adsorption system is also connected with waste gas incinerator.

[0007] As a preferred technical scheme of the utility model, the fifth pipeline is equipped with activated carbon adsorption condensate feeding pump.

[0008] As a preferred technical scheme of the utility model, the third pipeline is equipped with three-level refrigeration system condensate feeding pump.

[0009] As a preferred technical scheme of the utility model, the three-level refrigeration system includes primary heat exchanger, secondary heat exchanger A / B and tertiary heat exchanger A / B.

[0010] Compared with the prior art, the system has the advantages that the system adopts a three-stage condensation plus activated carbon adsorption treatment process, the residual gas of the third stage of the three-stage condensation returns to the front pre-heat exchanger in front of the first stage, the cold energy is recycled, the oil gas entering the oil gas recovery treatment device is pre-cooled, energy saving effect is achieved, the activated carbon adsorption has wide application range, good treatment effect, can recycle useful materials (turn waste into treasure), and the adsorbent can be repeatedly used, after the waste gas of the POSM and the polymer polyol is subjected to gas-liquid separation through the oil gas recovery system, the VOCS gas is subjected to condensation recovery liquid phase, the gas phase after treatment still cannot reach the emission standard, the gas phase is sent to the waste gas incinerator for treatment by the air blower, and zero emission of the organic waste gas is truly realized. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The utility model of structure schematic drawing.

[0012] In the drawing: 1 - polymer polyol device;2 - POSM device;3 - waste gas flow regulating valve group;4 - three-stage refrigeration system;5 - three-stage refrigeration system condensate feeding pump;6 - styrene recovery treatment system;7 - activated carbon adsorption condensate feeding pump;8 - activated carbon adsorption system;9 - waste gas incinerator;10 - first pipeline;11 - second pipeline;12 - third pipeline;13 - fourth pipeline;14 - fifth pipeline. DETAILED DESCRIPTION

[0013] The preferred embodiments of the utility model are described in detail below in combination with the drawings, so that the advantages and characteristics of the utility model can be more easily understood by the person skilled in the art, and the protection scope of the utility model is more clearly and explicitly defined.

[0014] Please refer to Figure 1The utility model provides a kind of technical scheme: a kind of styrene-containing waste gas processing system, including polymer polyol device 1 and POSM device 2, polymer polyol device 1 and POSM device 2 are connected with tertiary refrigeration system 4 by first pipeline 10, waste gas of polymer polyol device 1 and POSM device 2 is transported into tertiary refrigeration system 4 by first pipeline 10, styrene-containing waste gas is gradiently cooled in condensing host by multiple stages, first be cooled to below 5 ℃ by primary heat exchanger, condense out part oil and water, then enter secondary heat exchanger A / B, be cooled to below-25 ℃ (system has double-25 ℃ cold field, A / B switching), again precipitate a part of oil, again enter tertiary heat exchanger A / B and be cooled to-70 ℃ (system has double-70 ℃ cold field, with-25 ℃ cold field synchronous switching), further precipitate a part of oil, to about 90% organic components (mainly styrene) are separated out, low-temperature VOCs body after separation of styrene is in turn returned to gas-gas heat exchanger and carries out back heat exchange, temperature rises to about 20-25 ℃.When the concentration of waste gas after separation is higher, it is sent to waste gas incinerator for incineration, tertiary refrigeration system 4 is connected with activated carbon adsorption system 8 by fourth pipeline 13, activated carbon adsorption system 8 is connected with styrene recovery treatment system 6 by fifth pipeline 14, activated carbon adsorption system 8 includes emergency activated carbon adsorption system and activated carbon adsorption system two sets of switchable processes, when device waste gas incinerator is parked, tail gas is automatically switched to emergency activated carbon adsorption system, adsorption system is alternately carried out adsorption-vacuumizing-pressurizing process by two adsorption tanks, the possibility of styrene polymerization can be effectively reduced by using negative pressure vacuumizing operation, styrene recovery treatment system 6 is connected with tertiary refrigeration system 4 and second pipeline 11 by third pipeline 12, and second pipeline 11 is connected with polymer polyol device 1 and POSM device 2 respectively.

[0015] Waste gas flow regulating valve group 3 is installed on first pipeline 10, and the total amount of waste gas treatment of POSM device and polyol device is adjusted using waste gas flow regulating valve group 3.

[0016] Activated carbon adsorption system 8 is also connected with waste gas incinerator 9, activated carbon adsorption condensate feeding pump 7 is installed on fifth pipeline 14, and tertiary refrigeration system condensate feeding pump 5 is installed on third pipeline 12; after passing through tertiary refrigeration system 4, condensate is sent to styrene recovery treatment system 6 by tertiary refrigeration system condensate feeding pump 5, and gas phase after tertiary refrigeration system is sent to activated carbon adsorption system 8 by air blower, and condensate after activated carbon adsorption is continuously sent to styrene recovery treatment system 6 by activated carbon adsorption condensate feeding pump 7. After adsorption, the gas phase is sent to waste gas incinerator 9 by air blower.

[0017] Tertiary refrigeration system 4 includes primary heat exchanger, secondary heat exchanger A / B and tertiary heat exchanger A / B.

[0018] The oil gas of the atmospheric tank top of the POSM and the vacuum exhaust tail gas of the POSM device and the polymer polyol are subjected to VOCs treatment, and a set of VOCs oil gas recovery system is arranged according to the device requirement. The oil gas recovery system adopts a three-stage condensation + activated carbon adsorption treatment process. The waste gas of the POSM and the polymer polyol is subjected to gas-liquid separation through the oil gas recovery system, the VOCs gas is subjected to liquid phase condensation recovery in normal operation, the gas phase after treatment still cannot reach the emission standard, and the gas phase is sent to a waste gas incinerator for treatment. The liquid phase is pumped to a downstream waste liquid incinerator.

[0019] The above examples only express the implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as the limitation of the scope of the present application. It should be pointed out that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. A system for treating a styrene-containing off-gas comprising a polyol plant (1) and a POSM plant (2), characterized in that: The polymer polyol device (1) and the POSM device (2) are connected with a three-stage refrigeration system (4) through a first pipeline (10), the three-stage refrigeration system (4) is connected with an activated carbon adsorption system (8) through a fourth pipeline (13), the activated carbon adsorption system (8) is connected with a styrene recovery treatment system (6) through a fifth pipeline (14), the styrene recovery treatment system (6) is connected with the three-stage refrigeration system (4) and a second pipeline (11) through a third pipeline (12), and the second pipeline (11) is connected with the polymer polyol device (1) and the POSM device (2) respectively.

2. The system for treating a waste stream comprising styrene of claim 1, wherein: A waste gas flow adjusting valve group (3) is arranged on the first pipeline (10).

3. The system for treating a waste stream comprising styrene of claim 1, wherein: The activated carbon adsorption system (8) is also connected with a waste gas incinerator (9).

4. The system for treating a waste stream comprising styrene of claim 1, wherein: An activated carbon adsorption condensate feeding pump (7) is arranged on the fifth pipeline (14).

5. The system for treating a waste stream comprising styrene of claim 1, wherein: A three-stage refrigeration system condensate feeding pump (5) is arranged on the third pipeline (12).

6. The system for treatment of a waste stream comprising styrenes of claim 1, wherein: The three-stage refrigeration system (4) comprises a primary heat exchanger, a secondary heat exchanger A / B and a tertiary heat exchanger A / B.

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