Cement kiln tail gas purification device

Abstract

The utility model discloses a cement kiln tail gas purification device which comprises a purification tower, a tail gas inlet pipe is installed on one side of the purification tower, and a switch valve is arranged on the tail gas inlet pipe. A rotatable first stirring shaft is mounted in the purification tower and is driven by an external first motor. The water tank is communicated with the bottom of the purification tower through a water return pipe, and a water return pump is arranged on the water return pipe. And the heat exchanger is communicated with the water tank. The utility model relates to the technical field of cement production, in particular to a cement kiln tail gas purification device, which can recycle generated waste water by arranging a waste water recycling system, and the utilization is mainly divided into two aspects, on one hand, heat in waste gas is utilized through a heat exchanger, and on the other hand, water resources are repeatedly utilized, so that the utilization rate of the waste water is improved. By arranging the treating fluid on-line preparation system, the recycled water resource can be utilized to prepare the treating fluid, and the treating fluid is pumped into the purification tower in real time, so that the tail gas purification effect is ensured, and the whole process does not need to be stopped.

Description

Technical Field

[0001] The utility model relates to the technical field of cement production, in particular to a cement kiln tail gas purification device. Background Art

[0002] The exhaust gas discharged from cement kilns generally contains sulfur and nitrogen oxides, dust particles and other substances. Currently, the treatment of exhaust gas is mainly completed through a spray tower. The treatment liquid (alkaline liquid) continuously sprayed in the spray tower reacts with the sulfur and nitrogen oxides in the exhaust gas, thereby achieving the purpose of purification.

[0003] The treatment liquid sprayed by the above-mentioned spray tower device needs to be prepared in advance. Once it is exhausted, it is necessary to stop the machine for refilling, which delays time. In addition, the waste liquid in the spray tower is directly discharged. Therefore, the overall water resource consumption is large and resource recycling is not achieved.

[0004] To this end, our company has developed this exhaust gas purification equipment, which can achieve the purpose of continuously supplying treatment liquid without stopping the machine, and at the same time utilize the waste liquid to save costs and improve resource utilization. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies of the prior art, the utility model provides a cement kiln tail gas purification device, which solves the problem of low efficiency of the prior tail gas purification device.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cement kiln tail gas purification device, comprising a purification tower, a tail gas inlet pipe is installed on one side of the purification tower, and a switch valve is arranged on the tail gas inlet pipe.

[0009] A rotatable first stirring shaft is installed in the purification tower, and the first stirring shaft is driven by an external first motor.

[0010] The water tank is connected with the bottom of the purification tower through a return pipe, and a return pump is arranged on the return pipe.

[0011] The heat exchanger is communicated with the water tank.

[0012] The mixing tank is communicated with the heat exchanger, a feed port is arranged on the mixing tank, a rotatable second stirring shaft is installed in the mixing tank, and the second stirring shaft is driven by an external second motor.

[0013] The mixing tank and the purification tower are connected through a pipeline, and a water pump is arranged on the pipeline.

[0014] An exhaust outlet is provided at the top of the purification tower.

[0015] As a further preference, a sleeve is detachably mounted on the exhaust outlet, and an activated carbon adsorption layer is built into the sleeve.

[0016] As a further preference, a filter plate is detachably mounted on the top of the water tank.

[0017] As further preferred, a cleaning brush is installed on the first stirring shaft, and the bristle portion of the cleaning brush is in contact with the inner wall of the purification tower.

[0018] (III) Beneficial effects

[0019] The utility model provides a cement kiln tail gas purification device. It has the following beneficial effects:

[0020] The cement kiln tail gas purification device can recycle the generated waste water by setting up a waste water recovery and treatment system. The utilization is mainly divided into two aspects. On the one hand, the heat in the exhaust gas is utilized through a heat exchanger, and on the other hand, water resources are reused. By setting up an online treatment liquid configuration system, the recovered water resources can be used to prepare the treatment liquid, and the treatment liquid can be pumped into the purification tower in real time to ensure the tail gas purification effect. The whole process does not require shutdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model.

[0022] In the figure: 1. purification tower; 2. exhaust gas inlet pipe; 3. switch valve; 4. first stirring shaft; 5. first motor; 6. water tank; 7. return pipe; 8. return pump; 9. heat exchanger; 10. mixing tank; 11. feed inlet; 12. second motor; 13. second stirring shaft; 14. pipeline; 15. water pump; 16. exhaust gas outlet; 17. casing; 18. filter plate; 19. cleaning brush. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1 As shown, the utility model provides a technical solution: a cement kiln exhaust gas purification device, including a purification tower 1, a tail gas inlet pipe 2 is installed on one side of the purification tower 1, and a switch valve 3 is arranged on the tail gas inlet pipe 2. It should be noted that the tail gas inlet pipe 2 needs to be immersed in the treatment liquid.

[0025] A rotatable first stirring shaft 4 is installed in the purification tower 1, and the first stirring shaft 4 is driven by an external first motor 5. In order to increase the contact efficiency between the exhaust gas and the treatment liquid, the first motor 5 is turned on to drive the first stirring shaft 4 to rotate, thereby accelerating the fusion of the exhaust gas and the treatment liquid. Secondly, through the rotation of the first stirring shaft 4, the newly added treatment liquid can be better and fully integrated with the old liquid.

[0026] A cleaning brush 19 is installed on the first stirring shaft 4, and the bristle part of the cleaning brush 19 is in contact with the inner wall of the purification tower 1. Since the high-temperature exhaust gas and the treated liquid merge, water vapor will be generated. In order to avoid the water vapor condensing on the inner wall of the purification tower 1 and causing scaling, the condensed water can be cleaned away by the cleaning brush 19.

[0027] The water tank 6 is connected to the bottom of the purification tower 1 through a return pipe 7, and a return pump 8 is arranged on the return pipe 7. A filter plate 18 is detachably installed on the top of the water tank 6. The filter plate 18 is removed regularly to clean it.

[0028] The heat exchanger 9 is communicated with the water tank 6 .

[0029] The mixing tank 10 is communicated with the heat exchanger 9 . The mixing tank 10 is provided with a feed inlet 11 . A rotatable second stirring shaft 13 is installed in the mixing tank 10 . The second stirring shaft 13 is driven by an external second motor 12 .

[0030] The mixing tank 10 is connected to the purification tower 1 through a pipe 14, and a water pump 15 is provided on the pipe 14. It should be noted that the unit flow rates of the water pump 15 and the return pump 8 should be set in combination with the whole, that is, it is necessary to ensure that the concentration of the treated liquid in the purification tower 1 is always guaranteed to be within the effective concentration range.

[0031] The top of the purification tower 1 is provided with an exhaust outlet 16 , on which a sleeve 17 is detachably mounted, and the sleeve 17 has an activated carbon adsorption layer built therein, and the exhaust gas can be further purified through the activated carbon adsorption tank.

[0032] Meanwhile, the contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field.

[0033] When in use, the purification tower 1 is filled with a treatment liquid, the switch valve 3 is opened, and the exhaust gas from the kiln tail is introduced into the purification tower 1 through the exhaust gas inlet pipe 2. The exhaust gas reacts with the treatment liquid (acid-base neutralization reaction, the treatment liquid is an alkaline liquid such as calcium hydroxide solution, and calcium sulfite or calcium nitrate precipitate and water are produced after the reaction), thereby absorbing sulfur and nitrogen oxides in the exhaust gas, and at the same time, the heat in the exhaust gas is transferred to the waste liquid.

[0034] Then, the return pump 8 is turned on to pump the waste liquid into the water tank 6 through the return pipe 7, and the sediment and dust particles in the waste liquid are collected by the filter plate 18 on the top of the water tank 6 to obtain relatively clean water. The heat in the water is then exchanged through the heat exchanger 9, and the heat can be introduced into the boiler, etc.

[0035] After that, the water is discharged into the mixing tank 10, and a proper amount of treatment raw materials (such as calcium hydroxide powder) are added into the mixing tank 10 through the feed port 11, and the second motor 12 is turned on to drive the second stirring shaft 13 to rotate, so as to prepare the treatment liquid, and then the treatment liquid is input into the purification tower 1 in real time through the water pump 15 and the pipeline 14 to replenish the treatment liquid.

[0036] The purified tail gas is discharged through the tail gas outlet 16 .

[0037] In summary, the cement kiln exhaust gas purification device can recycle the generated wastewater by setting up a wastewater recovery and treatment system. The utilization is mainly divided into two aspects. On the one hand, the heat in the exhaust gas is utilized through a heat exchanger, and on the other hand, water resources are reused. By setting up an online treatment liquid configuration system, the recycled water resources can be used to prepare the treatment liquid, and the treatment liquid can be pumped into the purification tower in real time to ensure the exhaust gas purification effect. The entire process does not require shutdown.

[0038] It should be noted that the electrical components appearing in this article are all connected to the external main controller and 220V or 380V mains electricity, and the main controller can be a conventional known device for controlling computers, etc. Its control principle, internal structure and control switch mode are all conventional means of the prior art, which are directly quoted here without further elaboration. In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cement kiln tail gas purification device, characterized in that: It comprises a purification tower (1), a tail gas inlet pipe (2) is installed on one side of the purification tower (1), and a switch valve (3) is arranged on the tail gas inlet pipe (2); A rotatable first stirring shaft (4) is installed in the purification tower (1), and the first stirring shaft (4) is driven by an external first motor (5); A water tank (6), the water tank (6) is connected to the bottom of the purification tower (1) through a return pipe (7), and a return pump (8) is provided on the return pipe (7); a heat exchanger (9) which is in communication with the water tank (6); A mixing tank (10) is connected to the heat exchanger (9), a feed port (11) is provided on the mixing tank (10), a rotatable second stirring shaft (13) is installed in the mixing tank (10), and the second stirring shaft (13) is driven by an external second motor (12); The mixing tank (10) and the purification tower (1) are connected via a pipeline (14), and a water pump (15) is provided on the pipeline (14); The top of the purification tower (1) is provided with an exhaust gas outlet (16).

2. A cement kiln tail gas purification device according to claim 1, characterized in that: A sleeve (17) is detachably mounted on the tail gas outlet (16), and an activated carbon adsorption layer is built into the sleeve (17).

3. A cement kiln tail gas purification device according to claim 1, characterized in that: A filter plate (18) is detachably mounted on the top of the water tank (6).

4. A cement kiln tail gas purification device according to claim 1, characterized in that: A cleaning brush (19) is installed on the first stirring shaft (4), and the bristle portion of the cleaning brush (19) is in contact with the inner wall of the purification tower (1).

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