CN204380487U - A kind of tail gas treatment device - Google Patents

Abstract

The utility model discloses a tail gas treatment equipment, which comprises a quenching tower, a first-stage tail gas absorption tower, a second-stage tail gas absorption tower, a first-stage settling tank, a second-stage settling tank and a washing liquid supply unit. A quenching tower spray layer; the tail gas is processed through the quenching tower, the first-level tail gas absorption tower and the second-level tail gas absorption tower successively; the waste washing liquid from the first-level tail gas absorption tower and the second-level tail gas absorption tower passes through the first-level After the settling tank and the secondary settling tank are settled, they are respectively circulated to the quench tower and the first-stage tail gas absorption tower as the first-stage fresh washing liquid; the waste washing liquid of the quick-cooling tower flows to the all The primary tail gas absorption tower; the washing liquid supply unit is used to supply secondary fresh washing liquid to the secondary tail gas absorption tower. The equipment of the utility model can effectively reduce the content of dust and hydrogen chloride gas in the tail gas of the catalyst airflow drying, so that the finally discharged tail gas reaches the standard.

Description

A kind of tail gas treatment equipment

technical field

The utility model relates to tail gas treatment equipment, in particular to a catalyst airflow drying tail gas treatment equipment.

Background technique

The washed catalyst contains some moisture, which usually needs to be removed by technical means, among which airflow drying is a common technique. The use of airflow drying technology will produce a large amount of exhaust gas. Under the action of the induced draft fan, the air-dried exhaust gas enters the absorption system, and part of the catalyst particles is drawn out and enters the exhaust gas to form dust. At the same time, hydrochloric acid is added during gel formation, and part of the hydrochloric acid volatilizes at high temperature, forming corrosive hydrogen chloride gas and entering the tail gas.

Utility model content

Based on the characteristics of the catalyst airflow drying tail gas above, the purpose of this utility model is to provide a tail gas treatment equipment, which can effectively remove the dust and corrosive gas HCL in the catalyst airflow drying tail gas, so that the final exhaust gas can reach Emission Standards.

In order to achieve the above purpose, the utility model provides a tail gas treatment equipment, wherein the equipment includes a quench tower, a first-stage tail gas absorption tower, a second-stage tail gas absorption tower, a first-stage settling tank, a second-stage settling tank and a washing liquid supply unit , wherein, a plurality of quenching tower injection layers are arranged in the quenching tower;

Wherein, the tail gas is processed sequentially through the quench tower, the first-level tail gas absorption tower and the second-level tail gas absorption tower; the waste washing liquid from the first-level tail gas absorption tower and the second-level tail gas absorption tower passes through the first-level settling tank and the second-level settling tank successively. After the first-stage settling tank settles, it is recycled to the quenching tower and the first-stage tail gas absorption tower as the first-stage fresh washing liquid; the waste washing liquid of the quick-cooling tower flows to the first-stage tail gas through the pipeline connected with the first-stage absorption tower. Absorption tower; the washing liquid supply unit is used to supply secondary fresh washing liquid to the secondary tail gas absorption tower.

Preferably, the primary exhaust gas absorption tower includes a shell and a primary packing layer arranged in the shell, and through the primary packing layer, the internal space of the shell is sequentially divided from top to bottom to be located above the primary packing layer. The primary washing liquid spraying area, the primary air flow inlet area located below the primary packing layer, wherein part of the primary fresh washing liquid is supplied to the primary washing liquid spraying area, and the waste washing liquid from the quenching tower flow to the primary airflow entry zone. A plurality of primary spraying layers for spraying part of the primary fresh cleaning liquid are arranged in the spraying area of the primary washing liquid; more preferably, multiple spraying devices are arranged in each of the primary spraying layers .

Preferably, the secondary exhaust gas absorption tower includes a shell and a secondary packing layer arranged in the shell, and the internal space of the shell is divided into the above secondary packing layer from top to bottom through the secondary packing layer. The secondary washing liquid spraying area, the secondary airflow entry area located below the secondary packing layer, wherein the secondary fresh washing liquid is supplied to the secondary washing liquid spraying area. A plurality of secondary spraying layers for spraying secondary fresh washing liquid are arranged in the secondary washing liquid spraying area; more preferably, a plurality of spraying devices are arranged in each of the secondary spraying layers.

Preferably, the multiple spraying layers of the quenching tower are used to spray part of the primary fresh washing liquid, and each spraying layer is provided with a spraying device.

Preferably, the outlet of the waste washing liquid located in the primary airflow entry area and the outlet of the waste washing liquid located in the secondary airflow entry area communicate with the inlet of the primary settling tank through pipelines respectively, and the cleaning of the primary settling tank The liquid outlet is communicated with the inlet of the secondary settling tank, and the clear liquid outlet of the secondary settling tank is respectively connected to the quench tower and the first-stage tail gas absorption tower through pipelines.

Through the above technical scheme, under the action of the induced draft fan, the dry tail gas of the catalyst airflow enters the quenching tower provided with the spray layer of the quenching tower through the air duct for pre-dust removal, part of the dust and hydrogen chloride gas are captured, and the rest of the dust and hydrogen chloride gas are The gas flow enters the first-stage exhaust gas absorption tower and the second-stage exhaust gas absorption tower for further treatment. The equipment of the utility model can effectively reduce the content of dust and hydrogen chloride gas in the tail gas of the catalyst airflow drying, so that the finally discharged tail gas reaches the standard.

Other features and advantages of the present utility model will be described in detail in the following specific embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, together with the following specific embodiments, are used to explain the utility model, but do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 is a tail gas treatment equipment of a specific embodiment of the present invention.

Explanation of reference signs

1Quick cooling tower 2First-level exhaust gas absorption tower 3Second-level exhaust gas absorption tower

4 primary settling tank 5 secondary settling tank 6 washing liquid supply unit

21 primary packing layer 31 secondary packing layer

Detailed ways

The specific implementation manners of the present utility model will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not intended to limit the utility model.

In the present utility model, in the case of no contrary description, the used orientation words such as "up and down" all refer to the vertical direction, defined by the horizontal height, and the higher horizontal height is called "up". , and the one with a lower level is called "down".

As shown in Figure 1, the utility model provides a tail gas treatment equipment, wherein, the equipment includes a quenching tower 1, a primary tail gas absorption tower 2, a secondary tail gas absorption tower 3, a primary settling tank 4, and a secondary settling tank 5 and the washing liquid supply unit 6, wherein, the quench tower 1 is provided with a plurality of spray layers of the quench tower;

Wherein, the tail gas is processed through the quench tower 1, the first-level tail gas absorption tower 2 and the second-level tail gas absorption tower 3 successively; the waste washing liquid from the first-level tail gas absorption tower 2 and the second-level tail gas absorption tower 3 passes through a The first-stage settling tank 4 and the second-stage settling tank 5 are respectively circulated to the quench tower 1 and the first-stage tail gas absorption tower 2 as the first-stage fresh washing liquid after settling; The pipelines connected to the towers 2 flow to the primary tail gas absorption tower 2; the washing liquid supply unit 6 is used to supply the secondary fresh washing liquid to the secondary tail gas absorption tower 3.

According to the utility model, the quench tower 1 is provided with a plurality of quench tower injection layers for spraying washing liquid. contact with the washing liquid to absorb the waste heat, dust and hydrogen chloride gas of the tail gas, so as to complete its pretreatment. Wherein, the number of spray layers of the quench tower can be adjusted by those skilled in the art according to the actual situation, for example, it can be 2 layers, or 3 layers, preferably 3 layers. Each spray layer of the quench tower is provided with a spray device for spraying washing liquid. Wherein, those skilled in the art can also adjust the quantity of spraying devices arranged on each layer according to the actual situation. According to a preferred embodiment of the present utility model, the spraying layer of the quench tower is 3 layers, and the number of spraying devices provided is 1, 4 and 1 respectively from top to bottom. Preferably, the spraying device is a spray gun, and a plurality of nozzles for spraying washing liquid are installed on the spray gun, and the shape of the nozzles can be the shape of the conventionally used nozzles in the field, such as but not limited to, with arc Nozzles, spiral nozzles, pressure nozzles, etc. In addition, according to the utility model, the spraying device of the spraying layer of the quenching tower may also be provided with a valve for adjusting the spraying amount of the washing liquid, so that the washing liquid can contact the exhaust gas according to a predetermined amount. Wherein, the washing liquid after being contacted with the tail gas is collected in the washing liquid storage area at the lower part of the quenching tower 1 by gravity.

In the present invention, when the tail gas to be treated is preferably catalyst air-dried tail gas, its temperature can be reduced to below 90° C. after being pretreated by the quenching tower 1 .

According to the utility model, the first-stage tail gas absorption tower 2 includes a shell and a first-stage packing layer 21 arranged in the shell, and the inner space of the shell is sequentially divided from top to bottom by the first-stage packing layer 21. The primary washing liquid spray area above the primary packing layer 21, and the primary air flow entry area below the primary packing layer 21; wherein, part of the primary fresh washing liquid is supplied to the primary washing liquid spray area, The waste scrubbing liquid from the scrubbing liquid storage area at the lower part of the quenching tower 1 flows to the primary airflow inlet area. That is, the washing liquid storage area at the lower part of the quenching tower 1 communicates with the primary gas flow inlet area of the primary exhaust gas absorption tower 2 .

According to the utility model, a plurality of primary spray layers for spraying part of the primary fresh cleaning liquid are arranged in the primary cleaning liquid spraying area, so as to absorb the gas flow entering the primary tail gas absorption tower 2 . Specifically, after the tail gas is pretreated by the quenching tower 1, it flows into the primary gas flow entering zone of the primary tail gas absorption tower 2, and then flows upward to the primary packing layer 21, where it is washed with the primary spray layer spraying. The liquids meet in reverse to further treat the exhaust gas. Wherein, the number of layers of the primary injection layer can be adjusted by those skilled in the art according to the actual situation, for example, it can be 2-4 layers, preferably 2 layers. Each layer is provided with a plurality of spraying devices for spraying washing liquid. Wherein, the number of injection devices provided in each layer can also be adjusted by those skilled in the art according to the actual situation, for example, 2-4. According to a preferred embodiment of the present invention, the quenching tower has two injection layers, and three injection devices are arranged on each layer. Preferably, the spraying device is a spray gun, and a plurality of nozzles for spraying washing liquid are installed on the spray gun, and the shape of the nozzles can be the shape of the conventionally used nozzles in the field, such as but not limited to, with arc Nozzles, spiral nozzles, pressure nozzles, etc. In addition, according to the present utility model, the spraying device of the first-stage spraying layer may also be provided with a valve for adjusting the spraying amount of the washing liquid, so that the washing liquid can contact the exhaust gas according to a predetermined amount.

In the present invention, the filler in the primary filler layer 21 may be one or more fillers conventionally used in the field, for example, filler balls, Pall rings, corrugated plates and the like. The height of the primary packing layer 21 can be selected in a wide range, as long as the tail gas entering the primary exhaust gas absorption tower 2 can be fully mixed with the washing liquid from the primary spray layer in the primary packing layer 21. Just get in touch. Preferably, the ratio of the height of the primary packing layer 21 to the total height of the primary exhaust gas absorption tower 2 is 0.2-0.4:1.

According to the utility model, the secondary tail gas absorption tower 3 includes a shell and a secondary packing layer 31 arranged in the shell, and the internal space of the shell is divided into two parts from top to bottom by the secondary packing layer 31. The secondary washing liquid spray area above the level packing layer 31, and the secondary airflow entry area below the secondary packing layer 31; wherein, the washing liquid from the washing liquid supply unit 6 is supplied to the secondary washing liquid spraying area . The tail gas treated by the primary tail gas absorption tower 2 enters the secondary tail gas absorption tower 3 through the secondary gas flow inlet area.

According to the utility model, a plurality of secondary spray layers for the cleaning liquid from the cleaning liquid supply unit 6 are arranged in the secondary cleaning liquid spraying area, so as to absorb the gas flow entering the secondary tail gas absorption tower 3 . Specifically, after the tail gas is treated by the primary exhaust gas absorption tower 2, it flows into the secondary gas flow entering area of the secondary exhaust gas absorption tower 3, and then flows upwards to the secondary packing layer 31, where it is mixed with the secondary gas flow from the secondary spray layer. The scrubbing liquids meet in reverse to further treat the exhaust gas. Wherein, the number of layers of the secondary injection layer can be adjusted by those skilled in the art according to the actual situation, for example, it can be 2-4 layers, preferably 3 layers. Each layer is provided with a plurality of spraying devices for spraying washing liquid. Wherein, the number of injection devices provided in each layer can also be adjusted by those skilled in the art according to the actual situation, for example, 2-4. According to a preferred embodiment of the present invention, the secondary spraying layer is 3 layers, and 3 spraying devices are arranged in each layer. Preferably, the spraying device is a spray gun, and a plurality of nozzles for spraying washing liquid are installed on the spray gun, and the shape of the nozzles can be the shape of the conventionally used nozzles in the field, such as but not limited to, curved Nozzles, spiral nozzles, pressure nozzles, etc. In addition, according to the present invention, the spraying device of the secondary spraying layer may also be provided with a valve for adjusting the spraying amount of the washing liquid, so that the washing liquid can contact the exhaust gas according to a predetermined amount.

In the present invention, the filler in the secondary filler layer 31 may be one or more fillers conventionally used in the field, for example, filler balls, Pall rings, corrugated plates and the like. The height of the secondary packing layer 31 can be selected in a wide range, as long as the tail gas entering the secondary tail gas absorption tower 3 can be fully mixed with the washing liquid from the secondary spray layer in the secondary packing layer 31 Just get in touch. Preferably, the ratio of the height of the secondary packing layer 31 to the total height of the primary exhaust gas absorption tower 2 is 0.1-0.2:1.

According to the utility model, the outlet of the waste washing liquid in the primary air flow entering area and the waste washing liquid outlet in the secondary air entering area communicate with the inlet of the primary settling tank 4 through pipelines respectively, so as to collect The waste washing liquid of the tail gas absorption tower 2 and the secondary tail gas absorption tower 3 is subjected to sedimentation treatment, wherein the clear liquid after the sedimentation treatment passes through the clear liquid outlet of the first-level settling tank 4 and enters the second-level settling tank 5 for further settling treatment The clear liquid after the secondary sedimentation treatment is respectively connected to the spray layer of the quench tower 1 and the primary tail gas absorption tower 2 through pipelines, so as to process washing liquid to them. Among them, the turbid liquid treated by the primary settling tank 4 and the secondary settling tank 5 is discharged by the turbid liquid pump and used for other processes. In addition, the clear liquid treated by the secondary settling tank 5 can also be used for other purposes, for example, to remove the washing cloth of the belt machine and the like.

Now take Fig. 1 as an example to illustrate a specific embodiment of the utility model for treating the tail gas of the catalyst airflow drying. Catalyst airflow drying tail gas enters from the tail gas inlet at the top of the quenching tower 1, and in the quenching tower 1 is in contact with the washing liquid ejected from the injection device of the spraying layer of the quenching tower to absorb the waste heat, dust and hydrogen chloride gas of the tail gas, thereby completing For the pretreatment of the dry tail gas of the catalyst gas flow, the temperature of the pretreated tail gas can be reduced to below 90°C. The washing liquid after being contacted with the tail gas is collected in the washing liquid storage area at the bottom of the quench tower 1 . The tail gas pretreated in the quenching tower 1 enters the first-stage exhaust gas absorption tower 2 and rises to the first-stage packing layer 21, where it is washed with the spraying device of the first-stage spraying layer. Reverse contact with the liquid to further absorb the waste heat, dust and hydrogen chloride gas of the tail gas. The tail gas that has been further treated in the primary tail gas absorption tower 1 enters the secondary tail gas absorption tower 3 and rises to the secondary packing layer 31, where it is sprayed with the injection device of the secondary spraying layer. The washing liquid that comes out is in reverse contact to absorb the waste heat, dust and hydrogen chloride gas of the tail gas again. The tail gas treated by the secondary tail gas absorption tower is discharged through the flue.

Wherein, the waste washing liquid in the washing liquid storage area at the lower part of the quenching tower 1 flows into the first-stage airflow entry area automatically, and the waste washing liquid outlet of the first-stage airflow entry area and the waste washing liquid in the secondary airflow entry area flow into the Describe the first-level settling tank 4, in which the waste washing liquid from the first-level tail gas absorption tower 2 and the second-level tail gas absorption tower 3 is settled, wherein, the clear liquid after the settling treatment passes through the clear liquid outlet of the first-level settling tank 4 , into the secondary settling tank 5 for further processing, the clear liquid after the secondary settling treatment is respectively connected to the spray layer of the quench tower 1 and the primary tail gas absorption tower 2 through pipelines, to supply them with a primary Fresh wash solution. Wherein, the turbid liquid treated by the primary settling tank 4 and the secondary settling tank 5 is discharged by the turbid liquid pump for use in other processes. In addition, the clear liquid treated by the secondary settling tank 5 can also be used for other purposes, for example, to remove the washing cloth of the belt machine and the like.

Wherein, the washing liquid supply unit 6 is used for supplying secondary fresh washing liquid to the spray layer of the secondary tail gas absorption tower 3 .

Using the equipment provided by the utility model to process the dry tail gas of the catalyst airflow, the dust content in the finally discharged net flue gas can be reduced to below 30mg/ ^m3 , the content of hydrogen chloride gas can be reduced to below 10mg/ ^m3 , and the tail gas can be reduced to below 30mg/m3. The discharge reaches the standard, the temperature can be lowered to below 70°C, and the remaining heat is effectively recovered.

The preferred embodiment of the utility model has been described in detail above, but the utility model is not limited to the specific details in the above embodiment, and within the scope of the technical concept of the utility model, various simple modifications can be made to the technical solution of the utility model , these simple modifications all belong to the protection scope of the present utility model.

In addition, it should be noted that the various specific technical features described in the above specific implementation manners may be combined in any suitable manner if there is no contradiction. In order to avoid unnecessary repetition, the utility model will not further describe various possible combinations.

In addition, any combination of various implementations of the present invention can also be made, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (9)

1. a tail gas treatment device, it is characterized in that, this equipment comprises quench tower (1), one-level tail gas absorber (2), secondary tail gas absorber (3), first grade subsides tank (4), secondary settling tank (5) and cleaning solution feed unit (6), wherein, multiple quench tower jetted layers is provided with in described quench tower (1);

Wherein, described tail gas is successively through described quench tower (1), and one-level tail gas absorber (2) and secondary tail gas absorber (3) process; Spend scrub stream from one-level tail gas absorber (2) and secondary tail gas absorber (3) is circulated to described quench tower (1) and one-level tail gas absorber (2) respectively as one-level fresh wash liquid successively after first grade subsides tank (4) and secondary settling tank (5) sedimentation; The spend scrub stream of described quench tower (1) by the pipe flow will that communicates with described first grade absorption tower (2) to described one-level tail gas absorber (2); Cleaning solution feed unit (6) is for supplying secondary fresh wash liquid to described secondary tail gas absorber (3).

2. equipment according to claim 1, it is characterized in that, described one-level tail gas absorber (2) comprises housing and is arranged at the one-level packing layer (21) in housing, and by one-level packing layer (21) inner space of housing is divided into from top to bottom be successively positioned at more than one-level packing layer (21) one-level cleaning solution spray district, be positioned at one-level packing layer (21) primary air stream below and enter district; Wherein, part described one-level fresh wash liquid is supplied to described one-level cleaning solution spray district, and the spend scrub stream from quench tower (1) flows to described primary air stream and enters district.

3. equipment according to claim 2, is characterized in that, is provided with multiple one-level jetted layers for shower portion one-level fresh wash liquid in described one-level cleaning solution spray district.

4. equipment according to claim 3, is characterized in that, is provided with multiple injection apparatus in every layer of described one-level jetted layers.

5. equipment according to claim 2, it is characterized in that, described secondary tail gas absorber (3) comprises housing and is arranged at the secondary packing layer (31) in housing, and by secondary packing layer (31) inner space of housing is divided into from top to bottom be successively positioned at more than secondary packing layer (31) secondary cleaning solution spray district, be positioned at secondary packing layer (31) secondary air flow below and enter district; Wherein, described secondary fresh wash liquid is supplied to described secondary cleaning solution spray district.

6. equipment according to claim 5, is characterized in that, is provided with multiple two-stage injection floor for spraying secondary fresh wash liquid in described secondary cleaning solution spray district.

7. equipment according to claim 6, is characterized in that, is provided with multiple injection apparatus in every layer of described two-stage injection layer.

8. equipment according to claim 1, is characterized in that, multiple quench tower jetted layers of described quench tower (1) are used for the new cleaning solution of one-level described in spout part, are provided with injection apparatus in each described jetted layers.

9. equipment according to claim 5, it is characterized in that, be positioned at spend scrub stream outlet that described primary air stream enters district to export with the spend scrub stream being positioned at described secondary air flow and entering district and communicate respectively by the entrance of pipeline with described first grade subsides tank (4), the purified liquor outlet of first grade subsides tank (4) communicates with the entrance of secondary settling tank (5), and the purified liquor outlet of secondary settling tank (5) is communicated to described quench tower (1) and described one-level tail gas absorber (2) respectively by pipeline.