CN204213953U - Flue gas of refuse burning dry spraying absorption system - Google Patents

Abstract

The utility model discloses a dry spray absorption system for waste incineration flue gas, which comprises a primary adsorption reactor, a secondary adsorption reactor, a mist eliminator, a fiber bag filter, an activated carbon mixer, a slaked lime mixer and a chimney. The gas outlet at the bottom of the adsorption reactor is connected to the ash discharge hopper, the upper part of the ash discharge hopper is sealed, and the bottom of the ash discharge hopper is provided with an ash discharge port. The top air outlet of the reactor is connected with the air inlet of the demister, the air outlet of the demister is connected with the air inlet of the fiber bag filter, the air outlet of the fiber bag filter is connected with the chimney, and the fiber bag filter The lower part of the device is provided with a discharge port, and the discharge port communicates with the activated carbon mixer. The utility model adopts the above-mentioned structure, which can make the waste incineration flue gas treatment process relatively simple, reduce the flue gas purification cost, make the flue gas clean thoroughly, avoid introducing new pollutants at the same time, and achieve effective utilization of resources.

Description

Waste incineration flue gas dry spray absorption system

technical field

The utility model relates to the field of waste incineration flue gas treatment, in particular to a dry spray absorption system for waste incineration flue gas.

Background technique

At present, there are generally three ways to deal with garbage, namely landfill, composting and incineration. Landfilling needs to occupy a large amount of land, and at the same time, the harmful components in the garbage will cause serious pollution to the atmosphere, soil and water, which not only destroys the ecological environment, but also seriously endangers human health; composting sorts and classifies garbage, requiring garbage The organic content is high, and the composting treatment cannot be reduced, and still needs a lot of land; the incineration treatment is to oxidize the organic waste into inert gaseous substances and inorganic non-combustible substances under the conditions of high temperature and sufficient supply to form a stable solid residue , Incineration treatment also has some outstanding problems, such as large investment, high operating costs, the need to add combustion accelerants, and the generated flue gas contains many harmful components, making it difficult to treat.

Relatively speaking, although incineration of garbage is indeed better than landfill and composting, the disadvantages of incineration are also obvious, that is, the smoke generated is not easy to deal with, and it is easy to cause pollution to the environment. At the same time, the current smoke The cost of the purification process is relatively high. In order to reduce operating costs, some flue gas treatment plants have reduced some steps or reaction time in the flue gas treatment process, resulting in incomplete flue gas treatment, and even introducing new pollutants, resulting in exhausted flue gas Gas does not meet emission standards.

Utility model content

The purpose of this utility model is to provide a dry-type spray absorption system for waste incineration flue gas, which solves the problems of complex waste incineration flue gas treatment process, high cost of flue gas purification, incomplete flue gas purification, and even the introduction of new pollutants .

In order to achieve the above object, the utility model adopts the following technical solutions to realize:

The waste incineration flue gas dry spray absorption system includes a primary adsorption reactor, a secondary adsorption reactor, a mist eliminator, a fiber bag filter, an activated carbon mixer, a slaked lime mixer and a chimney. The primary adsorption reactor Including the inlet pipe arranged on the top of the primary adsorption reactor and the first sprayer and the second sprayer arranged in the primary adsorption reactor, the first sprayer and the second sprayer are mixed with activated carbon, the bottom of the primary adsorption reactor The air outlet is connected with an ash discharge hopper, the upper part of the ash discharge hopper is sealed, the bottom of the ash discharge hopper is provided with an ash discharge port, the bottom air inlet of the secondary adsorption reactor is connected with the ash discharge hopper, and the bottom of the secondary adsorption reactor is connected to the ash discharge hopper. The air outlet at the top is connected with the air inlet of the mist eliminator, and a third sprayer is arranged in the secondary adsorption reactor, and the third sprayer is connected with the slaked lime mixer, and the air outlet of the mist eliminator is connected with the fiber bag filter The air inlet of the fiber bag filter is connected to the air outlet of the fiber bag filter and the chimney. There are multiple side by side fiber filter bags inside the fiber bag filter, and the lower part of the fiber bag filter is provided with a discharge port. The port communicates with the activated carbon mixer.

In this scheme, the waste incineration flue gas enters through the air inlet of the first-stage adsorption reactor, and the first sprayer and the second sprayer form activated carbon spray respectively, and the pigment, odor, most organic pollutants and certain pollutants in the flue gas Some inorganic substances, as well as some toxic heavy metals, particles, etc. are removed. Since the two-stage sprayer is installed, it can ensure that the activated carbon in the flue gas in the first-stage adsorption reactor is fully adsorbed, and the flue gas after the activated carbon adsorption is completed enters through the ash hopper Secondary adsorption reactor, the solid dust produced by the primary adsorption reactor enters the ash discharge hopper and can be discharged from the bottom ash discharge port of the ash discharge hopper; the flue gas entering the secondary adsorption reactor is discharged under the action of the third sprayer , produce a chemical reaction with the slaked lime spray, neutralize the acid gas in the flue gas, and then the flue gas continues to enter the demister, where the moisture in the flue gas and the sulfuric acid that may be dissolved in the water are removed , sulfate, sulfur dioxide, etc., and then enter the fiber bag filter, the flue gas will remove the remaining particles in the flue gas under the action of the fiber filter bag, and the particles at this time are mainly activated carbon, which will be removed The activated carbon is then sent to the activated carbon mixer, which can further improve the utilization rate of activated carbon while avoiding being directly discharged and wasted; after successively activated carbon adsorption, slaked lime deacidification, demisting, filter bag filtration, and finally discharged into the atmosphere through the chimney . During the entire flue gas treatment process, the characteristics of each component in the flue gas are fully considered, and the flue gas is purified by using the first-level adsorption reactor, the second-level adsorption reactor, the demister, and the fiber bag filter. The process design Simple and reasonable, each step is properly processed, and the processing cost is low. The final exhaust gas does not contain harmful components and fully meets the emission standards.

Further, as a preferred solution, an air compressor is also included, and the air compressor communicates with the first sprayer and the third sprayer respectively. Under the action of the air compressor, the mist sprayed by the first sprayer and the third sprayer spreads wider, so as to fully contact with the smoke and enhance the effect of adsorption reaction.

Further, as a preferred solution, the first sprayer is arranged in the upper part of the primary adsorption reactor, and the second sprayer is arranged in the middle of the primary adsorption reactor. Through such an arrangement, the flue gas can be sprayed and contacted with activated carbon as much as possible, and the adsorption efficiency of the primary adsorption reactor can be improved.

Further, as a preferred solution, the third sprayer is arranged at the bottom of the secondary adsorption reactor. Since the flue gas enters from the bottom of the secondary adsorption reactor, after the third sprayer is set at the bottom of the secondary adsorption reactor, the slaked lime spray is sprayed upwards, and the spray is in contact with the flue gas during the rising and falling process. Therefore, the contact time between the slaked lime spray and the flue gas is increased, which not only improves the utilization rate of the slaked lime spray, but also makes the flue gas react more thoroughly, and the discharged gas is more pure.

Further, as a preferred solution, it also includes a water pool, a lime slaker and a lime bin, the water pool communicates with the activated carbon mixer and the slaked lime mixer, and the slaked lime mixer, the lime slacker, and the lime bin communicate in sequence. The lime silo provides quicklime, and after passing through the lime slaker, slaked lime is obtained. The slaked lime is added to the slaked lime mixer and mixed with water to obtain slaked lime water. After adding water pools, lime slakers and lime silos, enough activated carbon mixed liquid and Slaked lime mixed liquid, so as to ensure the continuous supply of the reaction liquid, improve the continuity of flue gas treatment, and in this way, can also reduce the cost of the reaction liquid, thereby reducing the cost of flue gas treatment.

Further, as a preferred solution, a stirrer is respectively arranged in the activated carbon mixer and the slaked lime mixer. Through the mixer, the concentration of the reaction liquid can be made more uniform, which is beneficial to the better treatment of the flue gas in the primary adsorption reactor and the secondary adsorption reactor, and also improves the liquid output efficiency of the activated carbon mixer and the slaked lime mixer, shortening the The time of the whole flue gas treatment.

Further, as a preferred solution, it also includes an activated carbon feed pump and a hydrated lime feed pump, the first sprayer and the second sprayer communicate with the activated carbon mixer through the activated carbon feed pump, and the third sprayer communicates with the hydrated lime mixer through the hydrated lime feed pump .

Further, as a preferred solution, an induced draft fan is also included, and the chimney communicates with the air outlet of the fiber bag filter through the induced draft fan. Under the action of the induced draft fan, the flue gas purified by the fiber bag filter can be quickly discharged, which improves the intake efficiency of the fiber bag filter, thereby improving the efficiency of the entire flue gas treatment.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

(1) During the entire flue gas treatment process, the characteristics of each component in the flue gas are fully considered, and the flue gas is purified by using the first-level adsorption reactor, the second-level adsorption reactor, the demister, and the fiber bag filter in sequence. , The process design is simple and reasonable, each step is properly processed, and the processing cost is low. The final exhaust gas does not contain harmful components and fully meets the emission standards.

(2) The utility model sets two sprayers in the primary adsorption reactor, so that the flue gas is fully adsorbed in the primary adsorption reactor. The whole flue gas absorption system is not only easy to realize in structure, but also has high processing efficiency , the exhaust gas can fully meet the emission standards, and the adsorbent and reaction liquid used are relatively cheap, making the overall treatment cost relatively low.

(3) The utility model is equipped with a fiber bag filter, and the flue gas removes the remaining particles in the flue gas under the action of the fiber filter bag. At this time, the particles are mainly activated carbon, and the removed activated carbon is sent to the activated carbon. In the mixer, while avoiding being directly discharged to waste, the utilization rate of activated carbon can be further improved.

(4) After the utility model arranges the third sprayer at the bottom of the secondary adsorption reactor, the slaked lime spray is sprayed upwards, and the spray is in contact with the flue gas during the rising and falling process, thereby improving the interaction between the slaked lime spray and the flue gas. The contact time not only improves the utilization rate of the slaked lime spray, but also makes the flue gas react more thoroughly and the exhaust gas is purer.

(5) The utility model can obtain enough activated carbon mixed liquid and slaked lime mixed liquid by adding water pool, lime slaking device and lime bin, so as to ensure the continuous supply of reaction liquid and improve the continuity of flue gas treatment, and adopt this method , can also reduce the cost of the reaction solution, thereby reducing the cost of flue gas treatment. At the same time, through the mixer, the concentration of the reaction liquid can be made more uniform, which is conducive to the better treatment of the flue gas in the primary adsorption reactor and the secondary adsorption reactor, and also improves the liquid output efficiency of the activated carbon mixer and the slaked lime mixer. , shorten the time of the whole flue gas treatment.

Description of drawings

Fig. 1 is the structural representation of the utility model.

The names corresponding to the reference signs in the accompanying drawings are:

1. Air inlet, 2. First atomizer, 3. Air compressor, 4. Primary adsorption reactor, 5. Second atomizer, 6. Ash discharge hopper, 7. Ash discharge port, 8. Secondary adsorption reaction Device, 9, demister, 10, fiber bag filter, 11, fiber filter bag, 12, induced draft fan, 13, chimney, 14, activated carbon feeding pump, 15, activated carbon mixer, 16, mixer, 17, Pool, 18, slaked lime feed pump, 19, slaked lime mixer, 20, lime slaking device, 21, lime bin, 22, the third sprayer, 23, discharge port.

Detailed ways

The utility model will be further described in detail below in conjunction with the examples, but the implementation of the utility model is not limited thereto.

Example 1:

As shown in Figure 1, the waste incineration flue gas dry spray absorption system described in this embodiment includes a primary adsorption reactor 4, a secondary adsorption reactor 8, a mist eliminator 9, a fiber bag filter 10, an activated carbon Mixer 15, slaked lime mixer 19 and chimney 13, primary adsorption reactor 4 includes the inlet pipe 1 that is arranged on the top of primary adsorption reactor 4 and the first sprayer 2 and the second sprayer 2 that are arranged in the primary adsorption reactor 4 The sprayer 5, the first sprayer 2 and the second sprayer 5 are all connected with the activated carbon mixer 15, and the gas outlet at the bottom of the primary adsorption reactor 4 is connected with the ash discharge hopper 6, the top of the ash discharge hopper 6 is sealed, and the bottom of the ash discharge hopper 6 is sealed. There is an ash discharge port 7, the bottom air inlet of the secondary adsorption reactor 8 is connected with the ash discharge hopper 6, the top air outlet of the secondary adsorption reactor 8 is connected with the air inlet of the demister 9, and the secondary adsorption reaction The device 8 is provided with a third sprayer 22, the third sprayer 22 communicates with the slaked lime mixer 19, the air outlet of the demister 9 communicates with the air inlet of the fiber bag filter 10, and the air outlet of the fiber bag filter 10 Connected with the chimney 13, the inside of the fiber bag filter 10 is provided with a plurality of side-by-side fiber filter bags 11, and the bottom of the fiber bag filter 10 is provided with a discharge port 23, which communicates with the activated carbon mixer 15.

In order to spread the mist sprayed by the first sprayer and the third sprayer wider and enhance the effect of adsorption reaction, this embodiment also includes an air compressor, and the air compressor 3 communicates with the first sprayer 2 and the third sprayer 22 respectively.

In order to make the flue gas contact with the activated carbon spray as much as possible and improve the adsorption efficiency of the primary adsorption reactor 4, the first sprayer 2 of this embodiment is arranged on the upper part of the primary adsorption reactor 4, and the second sprayer 5 is arranged on the first stage The middle part of the adsorption reactor 4.

In order to increase the contact time between the slaked lime spray and the flue gas and the utilization rate of the slaked lime spray, to make the flue gas react more thoroughly and the discharged gas to be more pure, the third sprayer 22 of this embodiment is arranged at the bottom of the secondary adsorption reactor 8 .

In order to obtain enough activated carbon mixed liquid and slaked lime mixed liquid, thereby ensuring the continuous supply of the reaction liquid, improving the continuity of flue gas treatment, reducing the cost of the reaction liquid, and further reducing the cost of flue gas treatment, this embodiment also includes a pool 17, Lime slaking device 20 and lime bin 21, said pool 17 communicates with activated carbon mixer 15 and slaked lime mixer 19, and slaked lime mixer 19, lime slaking device 20, lime bin 21 communicates in sequence.

In order to make the concentration of the reaction solution more uniform, it is beneficial for the primary adsorption reactor and the secondary adsorption reactor to better realize the treatment of flue gas, and at the same time, it also improves the liquid output efficiency of the activated carbon mixer and slaked lime mixer, and shortens the entire flue gas flow rate. During the gas treatment, an agitator 16 is respectively arranged in the activated carbon mixer 15 and the slaked lime mixer 19 of the present embodiment.

Present embodiment also comprises activated carbon feed pump 14 and slaked lime feed pump 18, the first sprayer 2 and the second sprayer 5 communicate with activated carbon mixer 15 through activated carbon feed pump 14, the 3rd sprayer 22 communicates with activated carbon mixer 15 through slaked lime feed pump 18. Slaked lime mixer 19 communicates.

In order to quickly discharge the flue gas purified by the secondary adsorption reactor, improve the intake efficiency of the secondary adsorption reactor, and then improve the efficiency of the entire flue gas treatment, this embodiment also includes an induced draft fan 12, and the chimney 13 passes through the induced draft fan 12 It communicates with the air outlet of the fiber bag filter 10 .

The working principle of this embodiment: the waste incineration flue gas enters through the air inlet 1 of the primary adsorption reactor 4, and the first sprayer 2 and the second sprayer 5 form activated carbon spray respectively, and the pigment, odor, and large Most organic pollutants and some inorganic substances, as well as some toxic heavy metals, particles, etc. are removed, and the flue gas after the activated carbon adsorption is completed enters the secondary adsorption reactor 8 through the ash discharge hopper 6, and the solid dust generated by the primary adsorption reactor 4 enters the to the ash discharge hopper 6, and can be discharged from the bottom ash discharge port 7 of the ash discharge hopper 6; the flue gas entering the secondary adsorption reactor 8 reacts chemically with the slaked lime spray under the action of the third sprayer 22, and the flue gas The acid gas in the gas is neutralized, and the flue gas purified by the secondary adsorption reactor 8 enters the mist eliminator 9, and after the moisture in the flue gas is removed, it is sent to the fiber bag filter 10, and the fiber filter bag 11 Filter out the remaining particles (mainly activated carbon) in the flue gas, and send the filtered particles into the activated carbon mixer 15 for continued use, and the gas purified by the fiber bag filter 10 is discharged into the atmosphere through the chimney 13 middle.

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any simple modification or equivalent change made to the above embodiments according to the technical essence of the utility model falls within the scope of the present utility model. Within the protection scope of the present utility model.

Claims (8)

1. Waste incineration flue gas dry spray absorption system, characterized in that it includes a primary adsorption reactor (4), a secondary adsorption reactor (8), a mist eliminator (9), and a fiber bag filter (10) , an activated carbon mixer (15), a slaked lime mixer (19) and a chimney (13), the primary adsorption reactor (4) includes an inlet pipe (1) arranged at the top of the primary adsorption reactor (4) and a set The first sprayer (2) and the second sprayer (5) in the primary adsorption reactor (4), both the first sprayer (2) and the second sprayer (5) are combined with the activated carbon mixer (15), the primary adsorption The gas outlet at the bottom of the reactor (4) is connected to the ash discharge hopper (6), the upper part of the ash discharge hopper (6) is sealed, and the bottom of the ash discharge hopper (6) is provided with an ash discharge port (7). The bottom air inlet of the reactor (8) is connected with the ash discharge hopper (6), the top air outlet of the secondary adsorption reactor (8) is connected with the air inlet of the demister (9), and the secondary adsorption reactor ( 8) There is a third sprayer (22) inside, the third sprayer (22) communicates with the slaked lime mixer (19), the air outlet of the demister (9) is connected with the fiber bag filter (10) The air inlet is connected, the air outlet of the fiber bag filter (10) is connected with the chimney (13), and the inside of the fiber bag filter (10) is provided with a plurality of side-by-side fiber filter bags (11), the fiber bag filter The lower part of the device (10) is provided with a discharge port (23), and the discharge port (23) communicates with the activated carbon mixer (15). 2. The waste incineration flue gas dry spray absorption system according to claim 1, characterized in that it also includes an air compressor (3), and the air compressor (3) is connected to the first atomizer (2) and the second atomizer respectively. The three sprayers (22) are connected. 3. The waste incineration flue gas dry spray absorption system according to claim 1, characterized in that: the first sprayer (2) is arranged on the upper part of the primary adsorption reactor (4), and the second sprayer (5) Set in the middle of the primary adsorption reactor (4). 4. The waste incineration flue gas dry spray absorption system according to claim 1, characterized in that: the third sprayer (22) is arranged at the bottom of the secondary adsorption reactor (8). 5. The waste incineration flue gas dry spray absorption system according to claim 1, characterized in that it also includes a water pool (17), a lime slaker (20) and a lime bin (21), the water pool (17) and The activated carbon mixer (15), the hydrated lime mixer (19) are connected, and the hydrated lime mixer (19), the lime slaking device (20), and the lime bin (21) are connected in sequence. 6. The waste incineration flue gas dry spray absorption system according to claim 5, characterized in that: the activated carbon mixer (15) and the slaked lime mixer (19) are respectively equipped with a mixer (16). 7. The waste incineration flue gas dry spray absorption system according to claim 1, characterized in that it also includes an activated carbon feed pump (14) and a slaked lime feed pump (18), the first sprayer (2) and the second sprayer The sprayer (5) communicates with the activated carbon mixer (15) through the activated carbon feed pump (14), and the third sprayer (22) communicates with the slaked lime mixer (19) through the slaked lime feed pump (18). 8. The waste incineration flue gas dry spray absorption system according to claim 1, characterized in that it also includes an induced draft fan (12), and the chimney (13) passes through the induced draft fan (12) and the fiber bag filter (10) The air outlet is connected.