Quenching and deacidification device for flue gas purification

Abstract

The utility model discloses a quenching and deacidification device for flue gas purification, which comprises a semi-dry deacidification tower, a deacidification slurry preparation system, a water tank and a static mixer, the semi-dry deacidification tower comprises a flue gas inlet pipeline connected with the lower part of the semi-dry deacidification tower, and a flue gas outlet pipeline connected with the upper part of the semi-dry deacidification tower, the flue gas stirring device, the spraying device and the demister are sequentially arranged in the semi-dry type deacidification tower from bottom to top, the spraying device and the demister are arranged in a double-layer mode, the flue gas stirring device is arranged at the flue gas inlet pipeline, and the demister is arranged below the flue gas outlet pipeline. Flue gas enters the semi-dry type deacidification tower and flows from bottom to top, the flue gas stirring device enables the flue gas to make uniform contact with deacidification slurry, meanwhile, the contact time is prolonged, the two layers of spraying devices are arranged, high-temperature flue gas is rapidly cooled and deacidified, then the flue gas passes through the two layers of demisters in sequence, flue gas deacidification is more thorough, and the deacidification efficiency is improved. The flue gas treatment efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas purification of household garbage pyrolysis gasification, and particularly relates to a quenching and deacidification device for flue gas purification. BACKGROUND

[0002] Household garbage pyrolysis gasification is a solid waste treatment method of reduction, harmlessness and resource utilization, and is widely used. However, the flue gas generated by household garbage pyrolysis gasification will produce toxic and harmful substances dioxin and a large amount of acid substances during slow cooling, especially the acid gases such as sulfur dioxide and hydrogen chloride, which will cause wide pollution to the environment if not treated before being discharged, and will also endanger human health.

[0003] In order to rapidly cool the flue gas, the traditional flue gas cooling tower usually adopts the cooling mode of directly contacting the flue gas with water. However, this cooling mode has disadvantages. Direct water spraying cooling usually causes uneven mixing of the flue gas and water, the flue gas cannot be fully washed, the flue gas treatment efficiency is low, a large amount of water resources is consumed, the waste water after use needs to be treated to meet the discharge standard before being discharged, the flue gas treatment investment cost is increased, in addition, the acid substances in the flue gas will cause corrosion to the equipment, the performance requirements of the related equipment and instruments of the quenching system are high, thereby further increasing the investment of the flue gas purification system and the operation and maintenance cost. In summary, the existing flue gas purification device has low flue gas treatment efficiency and high investment cost, and is not suitable for use in all household garbage pyrolysis gasification stations, such as small household garbage pyrolysis gasification stations. CONTENT OF THE INVENTION

[0004] Therefore, the present application provides a quenching and deacidification device for flue gas purification to solve the technical problem of low flue gas treatment efficiency and high investment cost in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical solution:

[0006] A quenching and deacidification device for flue gas purification, characterized in that the quenching and deacidification device comprises a semi-dry deacidification tower, a deacidification slurry configuration system, a water tank and a static mixer, the semi-dry deacidification tower comprises a flue gas inlet pipe connected to the lower part of the semi-dry deacidification tower, a flue gas outlet pipe connected to the upper part of the semi-dry deacidification tower, and a flue gas stirring device, a spraying device and a demister arranged in the semi-dry deacidification tower from bottom to top, the spraying device and the demister are arranged in double layers respectively, the height of the flue gas stirring device is higher than the flue gas outlet of the flue gas inlet pipe, and the demister is arranged below the flue gas outlet pipe.

[0007] The semi-dry deacidification tower bottom is connected with the deacidification slurry configuration system through a first pipeline, the deacidification slurry configuration system is connected to the static mixer through a second pipeline, the water tank is connected to the static mixer through a third pipeline, and the static mixer is connected with the spraying device through a fourth pipeline.

[0008] Preferably, the quenching and deacidification device further comprises a compressed air system, the spraying device is provided with a double-fluid spray gun, a first fluid channel of the double-fluid spray gun is connected with the fourth pipeline, and a second fluid channel of the double-fluid spray gun is connected with the compressed air system through a fifth pipeline.

[0009] Preferably, the tower body of the semi-dry deacidification tower is in a cylindrical shape, and the semi-dry deacidification tower is provided with an access door below.

[0010] Further preferably, the tower bottom of the semi-dry deacidification tower is in an arc shape, and the smoke flow stirring device is in an arc structure, and the arc structure is arranged opposite to the arc shape of the tower bottom of the semi-dry deacidification tower.

[0011] Preferably, a first valve is arranged on the first pipeline, a second valve is arranged on the second pipeline, a third valve is arranged on the third pipeline, a fourth valve is arranged on the smoke inlet pipeline, and a fifth valve is arranged on the smoke outlet pipeline.

[0012] Further preferably, a first concentration sensor is arranged on the deacidification slurry configuration system, a second concentration sensor is arranged on the fourth pipeline, a third concentration sensor and a first temperature sensor are arranged on the smoke inlet pipeline, and a fourth concentration sensor and a second temperature sensor are arranged on the smoke outlet pipeline.

[0013] Further preferably, the second valve and the third valve are quantitative control valves.

[0014] Further preferably, the quenching and deacidification device comprises a control system, the control system is electrically connected with the deacidification slurry configuration system and the compressed air system, and the control system is electrically connected with the first concentration sensor, the second concentration sensor, the third concentration sensor, the fourth concentration sensor, the first temperature sensor, the second temperature sensor, the second valve and the third valve.

[0015] Compared with the prior art, the application has at least the following beneficial effects:

[0016] The application relates to a kind of flue gas purification quenching and deacidification device, including semi-dry deacidification tower, deacidification slurry configuration system, water tank and static mixer, semi-dry deacidification tower includes flue gas inlet pipeline connected with the lower part of semi-dry deacidification tower, flue gas outlet pipeline connected with the upper part of semi-dry deacidification tower, and the flue gas stirring device, the spraying device, the demister arranged from bottom to top in semi-dry deacidification tower, the spraying device and the demister are double-layered respectively, the flue gas stirring device is arranged at flue gas inlet pipeline, the demister is arranged below flue gas outlet pipeline, the bottom of semi-dry deacidification tower is connected with deacidification slurry configuration system by first pipeline, deacidification slurry configuration system is connected to static mixer by second pipeline, water tank is connected to static mixer by third pipeline, and static mixer is connected with spraying device by fourth pipeline.Flue gas enters semi-dry deacidification tower through flue gas inlet pipeline, flue gas flows from bottom to top, and is mixed with deacidification slurry sprayed by spraying device countercurrently, and the flue gas stirring device makes flue gas and deacidification slurry contact uniformly while increasing the contact time, the spraying device is provided with two layers, so that high-temperature flue gas is rapidly cooled while deacidification is carried out, and then flue gas passes through two layers of demisters in sequence, so that flue gas deacidification is more thorough, and flue gas treatment efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more directly illustrate the prior art and the present application, the following exemplary drawings are given. It should be understood that the specific shapes, structures shown in the drawings should not be regarded as limiting conditions in the implementation of the present application; for example, based on the technical concept disclosed in the present application and the exemplary drawings, those skilled in the art can easily make routine adjustments or further optimization on the increase / decrease / ownership division of certain units (components), specific shape, positional relationship, connection mode, size ratio relationship, etc.

[0018] Figure 1 A schematic diagram of a flue gas purification quenching and deacidification device provided by the present application is shown in the drawings.

[0019] Explanation of reference signs:

[0020] 1, semi-dry deacidification tower; 2, spraying device; 3, demister; 4, static mixer; 5, deacidification slurry configuration system; 6, water tank; 7, control system; 8, flue gas inlet pipeline; 9, flue gas outlet pipeline; 10, access door; 11, compressed air system; 12, flue gas stirring device; 13, first pipeline; 14, second pipeline; 15, third pipeline; 16, fourth pipeline; 17, fifth pipeline; 18, first valve; 19, second valve; 20, third valve; 21, first concentration sensor; 22, second concentration sensor. DETAILED DESCRIPTION

[0021] The present application will be further described in detail below with reference to the accompanying drawings.

[0022] The utility model discloses a purpose lies in providing a kind of quenching and deacidification device of flue gas purification, main purpose lies in how to improve flue gas treatment efficiency.

[0023] Reference Figure 1 As shown in the figure, a kind of quenching and deacidification device of flue gas purification is provided, including semi-dry deacidification tower 1, deacidification slurry configuration system 5, water tank 6 and static mixer 4, semi-dry deacidification tower 1 includes with the flue gas inlet pipeline 8 being connected with semi-dry deacidification tower 1 below, with the flue gas outlet pipeline 9 being connected with semi-dry deacidification tower 1 above, and be provided with by the flue gas stirring device 12 of setting from below to above in semi-dry deacidification tower 1 inside, spray device 2, demister 3, spray device 2 is set to double deck, demister 3 is also set to double deck.

[0024] Flue gas stirring device 12 is set to flue gas inlet pipeline 8, i.e. the height of flue gas stirring device 12 is higher than the smoke outlet of flue gas inlet pipeline 8, preferably, the tower body of semi-dry deacidification tower 1 is cylindrical, the lower portion of tower body is provided with access door 10, the bottom of tower body is the arc tower bottom bending downward, flue gas stirring device 12 is the arc structure bending upward, i.e. the arc structure of flue gas stirring device 12 is oppositely arranged with the arc of the bottom of semi-dry deacidification tower 1, flue gas is directly entered into the lower portion of flue gas stirring device 12 through the smoke outlet of flue gas inlet pipeline 8, under the action of flue gas stirring device 12 and arc tower bottom, it is rotated downward at reduced speed, then flue gas flows upward from the periphery of flue gas stirring device 12 and diffuses in the process of flowing, so that flue gas mixes more evenly with deacidification slurry, and the rising speed of flue gas slows down, increases the contact time of flue gas and deacidification slurry, so that the deacidification effect is better.

[0025] Demister 3 is set to the lower portion of flue gas outlet pipeline 9, after the flue gas after deacidification enters flue gas outlet pipeline 9, passes through two layers of demister 3, so that the liquid drop in flue gas is excluded more thoroughly, improves the deacidification effect of flue gas.

[0026] The bottom of semi-dry deacidification tower 1 is connected with deacidification slurry configuration system 5 through first pipeline 13, deacidification slurry configuration system 5 is connected to static mixer 4 through second pipeline 14, water tank 6 is connected to static mixer 4 through third pipeline 15, static mixer 4 is connected with spray device 2 through fourth pipeline 16.Specifically, after contacting with flue gas, deacidification slurry enters deacidification slurry configuration system 5 through first pipeline 13 in the bottom of semi-dry deacidification tower 1, the concentration of deacidification slurry is adjusted in deacidification slurry configuration system 5, then deacidification slurry configuration system 5 sends deacidification slurry to static mixer 4 through second pipeline 14, water tank 6 also sends water to static mixer 4 through third pipeline 15, static mixer 4 mixes water with deacidification slurry of certain concentration, then sends the deacidification slurry diluted by water into spray device 2 through fourth pipeline 16, and spray device 2 sprays flue gas again, so that the spray slurry realizes recycling, the whole process reduces input cost.

[0027] In addition, the flue gas enters the semi-dry deacidification tower 1 through the flue gas inlet pipe 8, the flue gas flows from bottom to top, is mixed with the deacidification slurry sprayed by the spraying device 2 in countercurrent, and the flue gas stirring device 12 makes the flue gas uniformly contact with the deacidification slurry and also increases the contact time. The spraying device 2 is provided with two layers from top to bottom, so that the high-temperature flue gas is rapidly cooled and deacidified at the same time, and then the flue gas passes through the two layers of mist eliminators 3 in turn, so that the flue gas is deacidified more thoroughly and the flue gas treatment efficiency is improved.

[0028] In a preferred embodiment, the spraying device 2 is provided with a double-fluid spray gun, the double-fluid spray gun includes a first fluid channel and a second fluid channel, the quenching and deacidification device includes a compressed air system 11, the first fluid channel of the double-fluid spray gun is connected with the fourth pipe 16, that is, the deacidification slurry mixed by the static mixer 4 is in the first fluid channel, and the second fluid channel of the double-fluid spray gun is connected with the compressed air system 11 through the fifth pipe 17, that is, the compressed air is in the second fluid channel.

[0029] Optionally, the quenching and deacidification device includes a control system 7, the deacidification slurry and the compressed air can be controlled by the control system 7, so that the deacidification slurry and the compressed air enter the double-fluid spray gun in a ratio that is just atomized into small droplets in a mist form. The two layers of spraying devices 2 each include a plurality of spray heads, and the spray heads spray the mist deacidification slurry.

[0030] In an embodiment, the first pipe 13 is provided with a first valve 18, the second pipe 14 is provided with a second valve 19, the third pipe 15 is provided with a third valve 20, the flue gas inlet pipe 8 is provided with a fourth valve, and the flue gas outlet pipe 9 is provided with a fifth valve, wherein the second valve 19 and the third valve 20 are quantitative control valves, the deacidification slurry configuration system 5 is connected to the static mixer 4 through the second pipe 14, and the water tank 6 is connected to the static mixer 4 through the third pipe 15, so that the flow rates of the deacidification slurry and the water are controlled through the quantitative control valves, and finally the spraying concentration and the spraying amount of the deacidification slurry entering the spraying system are controlled. The deacidification slurry configuration system 5 and the water tank 6 can make the deacidification slurry and the water enter the static mixer 4 through a power system.

[0031] The deacidification slurry configuration system 5 is provided with a first concentration sensor 21, the fourth pipe 16 is provided with a second concentration sensor, the flue gas inlet pipe 8 is provided with a third concentration sensor and a first temperature sensor, and the flue gas outlet pipe 9 is provided with a fourth concentration sensor and a second temperature sensor.

[0032] The first valve 18 arranged on the first pipeline 13 at the bottom of the semi-dry deacidification tower 1 controls the backflow of the deacidification slurry into the deacidification slurry preparation system 5, the concentration of the deacidification slurry in the deacidification slurry preparation system 5 is obtained through the first concentration sensor 21 arranged on the deacidification slurry preparation system 5, if the concentration of the deacidification slurry is low, the deacidification agent such as lime slurry is put into the deacidification slurry preparation system 5 in an appropriate amount to obtain the deacidification slurry with a certain concentration. The water and the deacidification slurry with a certain concentration are mixed through the static mixer 4, the second concentration sensor arranged on the second pipeline 16 after the static mixer 4 is a second concentration sensor, and the concentration of the mixture is fed back in real time.

[0033] In a preferred embodiment, the quenching and deacidification device comprises a control system 7, the control system 7 is electrically connected with the deacidification slurry preparation system 5 and the compressed air system 11, the control system 7 is electrically connected with the first concentration sensor 21, the second concentration sensor, the third concentration sensor, the fourth concentration sensor, the first temperature sensor, the second temperature sensor, the second valve 19 and the third valve 20.

[0034] The deacidification slurry preparation system 5 feeds back the concentration information to the control system 7 through the first concentration sensor 21, and the control system 7 controls the amount of deacidification agent put into the deacidification slurry preparation system 5 through the set concentration of the deacidification slurry.

[0035] Specifically, the deacidification slurry preparation system 5 comprises a slurry tank and a power system, the first concentration sensor 21 can measure the concentration of the deacidification slurry in the slurry tank, the deacidification slurry collected at the bottom of the semi-dry deacidification tower 1 enters the slurry tank through the first pipeline 13, the concentration of the deacidification slurry is adjusted in the slurry tank, that is, the control system 7 controls the amount of deacidification agent put into the slurry tank through the set concentration of the deacidification slurry, and then the deacidification slurry is sent to the static mixer 4 through the second pipeline 14 by the power system.

[0036] The control system 7 obtains the temperature and concentration of the flue gas entering the furnace through the third concentration sensor and the first temperature sensor arranged on the flue gas inlet pipeline 8, and obtains the temperature and concentration of the outlet flue gas through the fourth concentration sensor and the second temperature sensor arranged on the flue gas outlet pipeline 9, and the control system 7 automatically controls the proportioning of the deacidification slurry and the water amount and the spraying amount through the feedback of the first concentration sensor 21 and the feedback of the second concentration sensor, so that the gas temperature and the acidic substances of the flue gas outlet pipeline 9 meet the emission requirements.

[0037] The technical features of the above embodiments can be combined in any manner (as long as the combination of the technical features does not exist contradictions), in order to make the description simple, not all possible combinations of the technical features in the above embodiments are described; the embodiments which are not explicitly written should also be considered as the scope of the present disclosure.

Claims

1. A quenching and deacidification device for flue gas cleaning, characterized in that, The quenching and deacidification device comprises a semi-dry deacidification tower (1), a deacidification slurry configuration system (5), a water tank (6) and a static mixer (4), the semi-dry deacidification tower (1) comprises a flue gas inlet pipeline (8) connected below the semi-dry deacidification tower (1), a flue gas outlet pipeline (9) connected above the semi-dry deacidification tower (1), and a flue gas stirring device (12), a spraying device (2) and a demister (3) arranged in the semi-dry deacidification tower (1) from bottom to top, the spraying device (2) and the demister (3) are arranged in double layers respectively, the height of the flue gas stirring device (12) is higher than the flue gas outlet of the flue gas inlet pipeline (8), and the demister (3) is arranged below the flue gas outlet pipeline (9). The bottom of the semi-dry deacidification tower (1) is connected with the deacidification slurry configuration system (5) through a first pipeline (13), the deacidification slurry configuration system (5) is connected with the static mixer (4) through a second pipeline (14), the water tank (6) is connected with the static mixer (4) through a third pipeline (15), and the static mixer (4) is connected with the spraying device (2) through a fourth pipeline (16).

2. A quenching and deacidifying device for flue gas cleaning according to claim 1, characterized in that, The quenching and deacidification device further comprises a compressed air system (11), the spraying device (2) is provided with a double-fluid spray gun, a first fluid channel of the double-fluid spray gun is connected with the fourth pipeline (16), and a second fluid channel of the double-fluid spray gun is connected with the compressed air system through a fifth pipeline (17).

3. A quenching and deacidifying device for flue gas cleaning according to claim 1, characterized in that, The tower body of the semi-dry deacidification tower (1) is in a cylindrical shape, and a manhole (10) is arranged below the semi-dry deacidification tower (1).

4. A flue gas cleaning, quenching and deacidification device according to claim 3, characterised in that The bottom of the semi-dry deacidification tower (1) is arc-shaped, the flue gas stirring device (12) is in an arc-shaped structure, and the arc-shaped structure is arranged opposite to the arc-shaped bottom of the semi-dry deacidification tower (1).

5. A flue gas cleaning, quenching and deacidification device according to claim 2, characterised in that First valves (18) are arranged on the first pipeline (13), second valves (19) are arranged on the second pipeline (14), third valves (20) are arranged on the third pipeline (15), fourth valves are arranged on the flue gas inlet pipeline (8), and fifth valves are arranged on the flue gas outlet pipeline (9).

6. A flue gas cleaning, quenching and deacidification apparatus according to claim 5, characterised in that First concentration sensors (21) are arranged on the deacidification slurry configuration system (5), second concentration sensors are arranged on the fourth pipeline (16), third concentration sensors and first temperature sensors are arranged on the flue gas inlet pipeline (8), and fourth concentration sensors and second temperature sensors are arranged on the flue gas outlet pipeline (9).

7. A flue gas cleaning, quenching and deacidification apparatus according to claim 6, characterised in that The second valves (19) and the third valves (20) are quantitative control valves.

8. A flue gas cleaning, quenching and deacidification apparatus according to claim 7, characterised in that The quenching and deacidification device comprises a control system (7) electrically connected with the deacidification slurry configuration system (5) and the compressed air system (11), and the control system (7) is electrically connected with the first concentration sensor (21), the second concentration sensor (22), the third concentration sensor, the fourth concentration sensor, the first temperature sensor, the second temperature sensor, the second valve (19) and the third valve (20).

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