Cellulose ether industry drying waste gas emission treatment system

Abstract

The utility model discloses a drying waste gas emission treatment system in the cellulose ether industry. The drying waste gas emission treatment system comprises an alkaline washing tower, a condenser and a carbon tank which are sequentially connected through a process pipeline, a spraying mechanism is mounted at the top of an inner cavity of the alkaline tower, a circulating pipe is connected outside the alkaline tower, the bottom end of the circulating pipe is connected with the bottom of the alkaline tower, the top end of the circulating pipe is connected with the spraying mechanism, and a circulating pump and a heat exchanger are sequentially mounted on the circulating pipe from bottom to top; an activated carbon layer is mounted in the middle of the inner cavity of the carbon canister; the top of the inner-cavity carbon canister is connected with a chimney through an air outlet pipe; the top of the inner cavity of the carbon tank is provided with a gas distribution mechanism, the gas distribution mechanism is connected with a desorption steam inlet pipe, and the bottom of the carbon tank is connected with a post-condensing device through a desorption steam outlet pipe. According to the drying waste gas emission treatment system in the cellulose ether industry, the viscosity of cellulose ether dust can be degraded, normal operation of organic waste gas recovery through activated carbon is ensured, the waste gas treatment process is economical, and carbon emission cannot be increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste gas emission treatment system, specifically, relate to a cellulose ether industry drying waste gas emission treatment system, belong to waste gas emission technical field. BACKGROUND

[0002] The drying waste gas is different due to the working condition, and its treatment method mainly has combustion method, adsorption method and catalytic oxidation method, but the application of each treatment method exists various problems due to some physical characteristics of cellulose ether industry.

[0003] When the combustion method is used to treat the cellulose ether industry drying waste gas, the high operating cost is needed, it is not economical, and the carbon emission is increased, so it is not recommended method.

[0004] When the adsorption method is used to treat the cellulose ether industry drying waste gas, due to the high viscosity of cellulose ether dust, the high viscosity of dust will have adverse effects on the adsorption effect of activated carbon, the high viscosity dust is easy to block the micropore of activated carbon, reduces its specific surface area and adsorption capacity, and even leads to the inactivation of activated carbon.

[0005] When the catalytic oxidation method is used to treat the cellulose ether industry drying waste gas, due to the extremely low concentration of organic waste gas, the concentration zeolite runner needs to be set, and the high-precision filter bag needs to be set for the trace dust, and the high-precision filter bag will inevitably form a large amount of hazardous waste products, forming high operating cost.

[0006] From the above, it is obvious that the prior art has inconvenience and defects in actual use, so it is necessary to improve. CONTENT OF THE UTILITY MODEL

[0007] The cellulose ether industry drying waste gas emission treatment system provided by the utility model can degrade cellulose ether dust viscosity, ensure the normal recovery of organic waste gas by activated carbon, and is economical and does not increase carbon emission in the waste gas treatment process.

[0008] To solve the above technical problems, the utility model adopts the following technical scheme:

[0009] A cellulose ether industry drying waste gas emission treatment system, comprising an alkali washing tower, a condenser and a carbon tank connected in sequence through a process pipeline.

[0010] The alkali washing tower is provided with a spraying mechanism at the top of the inner cavity, and the outer part of the alkali washing tower is connected with a circulating pipe, the bottom end of the circulating pipe is connected with the bottom part of the alkali washing tower, the top end of the circulating pipe is connected with the spraying mechanism, and the circulating pump and the heat exchanger are installed on the circulating pipe in sequence from bottom to top.

[0011] The activated carbon layer is arranged in the middle of the inner cavity of the carbon tank, and the top of the inner cavity of the carbon tank is connected with the chimney through the gas outlet pipe.

[0012] Further, the bottom of the alkali washing tower is connected with the drying waste gas inlet pipe.

[0013] Further, the upper part of the inner cavity of the alkali washing tower is provided with the filler, and the spraying mechanism is arranged on the filler.

[0014] Further, the spraying mechanism is also connected with the alkali solution supplement pipe.

[0015] Further, the top of the alkali washing tower is provided with the gas phase outlet, and the gas phase outlet is connected with the inlet of the condenser through the pipeline.

[0016] Further, the bottom of the condenser is provided with the gas phase outlet and the liquid phase outlet, the gas phase outlet is connected with the bottom of the inner cavity of the carbon tank through the air inlet pipe, and the air inlet pipe is provided with the fan.

[0017] Further, the liquid phase outlet is connected with the bottom of the alkali washing tower through the pipeline.

[0018] Further, the carbon tank is arranged in the transverse direction.

[0019] Further, the number of the carbon tanks is at least two, and the carbon tanks are connected in parallel into the pipeline.

[0020] Compared with the prior art, the above technical scheme has the following advantages:

[0021] The alkali solution with a certain concentration is circulated and sprayed through the circulating pump and the heat exchanger, the viscosity of the trace cellulose ether dust in the drying exhaust gas is degraded under the condition of a certain temperature of the alkali solution and oxygen, and the degraded drying exhaust gas is cooled by the condenser and then enters the carbon tanks for adsorption treatment.

[0022] The present application not only meets the relatively economic environmental protection standard emission, but also achieves the social benefits without increasing the cost, and the waste gas recycling also reduces the environmental protection operation cost of the enterprise.

[0023] The present application will be described in detail below in combination with the drawings and examples. DRAWINGS

[0024] Figure 1 is a structural schematic view of the present application;

[0025] Figure 2 is a schematic view of the internal structure of the carbon tank.

[0026] In the figure, 1 is an alkali washing tower, 2 is a drying waste gas inlet pipe, 3 is a filler, 4 is a circulating pipe, 5 is a circulating pump, 6 is a heat exchanger, 7 is a spraying mechanism, 8 is an alkali liquid supplement pipe, 9 is a condenser, 10 is an air inlet pipe, 11 is a fan, 12 is a carbon tank, 13 is an activated carbon layer, 14 is an air outlet pipe, 15 is a chimney, 16 is a gas distribution mechanism, 17 is a desorption steam inlet pipe, 18 is a desorption steam outlet pipe, and 19 is a post-condensation device. DETAILED DESCRIPTION

[0027] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described with reference to the accompanying drawings.

[0028] As shown in Figure 1 and Figure 2 collectively shown, the present application provides a cellulose ether industry drying waste gas emission treatment system, which comprises an alkali washing tower 1, a condenser 9 and a carbon tank 12 connected in sequence through process pipelines.

[0029] The alkali washing tower 1 is connected with the drying waste gas inlet pipe 2 at one side of the bottom, the filler 3 is installed at the upper part of the inner cavity of the alkali washing tower 1, the spraying mechanism 7 is installed at the top of the inner cavity of the alkali washing tower 1, the spraying mechanism 7 is located above the filler 3, the circulating pipe 4 is connected with the outside of the alkali washing tower 1, the bottom end of the circulating pipe 4 is connected with the bottom of the alkali washing tower 1, and the top end of the circulating pipe 4 is connected with the spraying mechanism 7.

[0030] The circulating pump 5 and the heat exchanger 6 are installed in sequence on the circulating pipe 4 in the direction from bottom to top, the circulating pump 5 circulates the drying condensate water and the alkali liquid with a certain concentration through the tower bottom, and the temperature of the circulating liquid is controlled through the heat exchanger 6. The viscosity of the trace cellulose ether dust in the drying waste gas can be degraded under certain temperature conditions by the sprayed alkali liquid and oxygen.

[0031] The spraying mechanism 7 is also connected with the alkali liquid supplement pipe 8, and the alkali liquid supplement pipe 8 is used for supplementing the alkali liquid with a certain concentration range.

[0032] The alkali washing tower 1 is provided with a gas phase outlet at the top, the gas phase outlet is connected with the inlet of the condenser 9 through a pipeline, and the drying waste gas enters the condenser 9 to be cooled.

[0033] The condenser 9 is provided with gas phase and liquid phase outlets at the bottom, the gas phase outlet is connected with the bottom of the inner cavity of the carbon tank 12 through the air inlet pipe 10, the fan 11 is installed on the air inlet pipe 10, and the liquid phase outlet is connected with the bottom of the alkali washing tower 1 through a pipeline.

[0034] The carbon tank 12 is arranged in the transverse direction, the activated carbon layer 13 is installed in the middle of the inner cavity of the carbon tank 12, the activated carbon layer 13 is used for adsorbing organic waste gas particles, and the top of the inner cavity of the carbon tank 12 is connected with the chimney 15 through the air outlet pipe 14.

[0035] The number of the carbon tanks 12 is at least two, and the carbon tanks 12 are connected in parallel in the pipeline.

[0036] The inner cavity of the carbon tank 12 is provided with a gas distribution mechanism 16 at the top, the gas distribution mechanism 16 is connected with a desorption vapor inlet pipe 17, and the bottom of the carbon tank 12 is connected with a rear condensing device 19 through a desorption vapor outlet pipe 18. The organic waste gas particles adsorbed by the activated carbon layer 13 enter the rear condensing device 19 after being desorbed by steam and are recycled.

[0037] The specific working principle of the utility model is as follows:

[0038] The drying waste gas first enters the bottom of the caustic washing tower 1, and then is washed through the spraying mechanism 7, the drying condensate water and the alkali liquor with a certain concentration are circulated and sprayed through the circulating pump 5 and the heat exchanger 6, the viscosity of the trace cellulose ether dust in the drying exhaust gas is degraded under the condition of the alkali liquor and oxygen at a certain temperature. The drying waste gas then enters each carbon tank 12 through the fan 11 after being cooled by the condenser 9, the activated carbon layer 13 in the carbon tank 12 adsorbs the organic waste gas particles, the waste gas reaches the standard after being adsorbed and is discharged into the chimney 10 through the gas outlet pipe 14. The organic waste gas particles adsorbed by the activated carbon layer 13 can enter the rear condensing device 19 after being desorbed by steam and be recycled.

[0039] The above is the example of the best implementation mode of the utility model, wherein the parts not described in detail are the common knowledge of the ordinary skilled in the art. The protection scope of the utility model is subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the utility model is also within the protection scope of the utility model.

Claims

1. A cellulose ether industry drying off-gas emission treatment system characterized by: The alkali washing tower (1), the condenser (9) and the carbon tank (12) are connected in sequence through process pipelines; A spraying mechanism (7) is installed at the top of the inner cavity of the alkali washing tower (1), and a circulating pipe (4) is connected to the outside of the alkali washing tower (1); the bottom end of the circulating pipe (4) is connected to the bottom of the alkali washing tower (1), and the top end of the circulating pipe (4) is connected to the spraying mechanism (7); a circulating pump (5) and a heat exchanger (6) are installed on the circulating pipe (4) in sequence from bottom to top; An active carbon layer (13) is installed in the middle of the inner cavity of the carbon tank (12), and the top of the inner cavity of the carbon tank (12) is connected to a chimney (15) through a gas outlet pipe (14); a gas distribution mechanism (16) is installed at the top of the inner cavity of the carbon tank (12), and the gas distribution mechanism (16) is connected to a desorption steam inlet pipe (17); the bottom of the carbon tank (12) is connected to a post-condensing device (19) through a desorption steam outlet pipe (18).

2. A cellulose ether industry drying exhaust gas emission treatment system as claimed in claim 1, characterized in that: One side of the bottom of the alkali washing tower (1) is connected to a drying waste gas inlet pipe (2).

3. A cellulose ether industry drying exhaust emission treatment system as claimed in claim 1, characterized in that: A filler (3) is installed at the upper part of the inner cavity of the alkali washing tower (1), and the spraying mechanism (7) is located above the filler (3).

4. A cellulose ether industry drying exhaust emission treatment system as claimed in claim 1, characterized in that: The spraying mechanism (7) is also connected to a lye supplement pipe (8).

5. A cellulose ether industry drying exhaust emission treatment system as claimed in claim 1, characterized in that: A gas phase outlet is arranged at the top of the alkali washing tower (1), and the gas phase outlet is connected to the inlet of the condenser (9) through a pipeline.

6. A cellulose ether industry drying exhaust emission treatment system as claimed in claim 5, characterized in that: A gas phase outlet and a liquid phase outlet are arranged at the bottom of the condenser (9), the gas phase outlet is connected to the bottom of the inner cavity of the carbon tank (12) through a gas inlet pipe (10), and a fan (11) is installed on the gas inlet pipe (10).

7. A cellulose ether industry drying exhaust emission treatment system as claimed in claim 6, characterized in that: The liquid phase outlet is connected to the bottom of the alkali washing tower (1) through a pipeline.

8. A cellulose ether industry drying exhaust emission treatment system as claimed in claim 1, characterized in that: The carbon tank (12) is arranged in a transverse direction.

9. A cellulose ether industry drying exhaust emission treatment system as claimed in claim 1, characterized in that: The number of the carbon tanks (12) is at least two, and the carbon tanks (12) are connected in parallel to the pipeline.

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