CN217605438U

CN217605438U - A high-efficient absorbing device for flue gas composition detects

Info

Publication number: CN217605438U
Application number: CN202221077358.0U
Authority: CN
Inventors: 钱峰; 侯洪宇; 王永; 马光宇; 徐鹏飞; 宋世哲; 邓军华; 张�杰; 于淑娟; 吴文浩
Original assignee: Angang Steel Co Ltd
Current assignee: Angang Steel Co Ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-10-18
Anticipated expiration: 2032-04-29

Abstract

The utility model relates to a high-efficiency absorption device for flue gas component detection, which comprises a flue gas inlet, an air suction pump, an absorber and a flue gas outlet which are connected in sequence, wherein the absorber comprises a reducing air inlet, a flue gas pipeline, a clapboard, a tank body, an air outlet and an absorption liquid outlet, the flue gas pipeline is cross-shaped and is formed by connecting four branch pipelines, and the branch pipelines and the air outlet holes at the end parts thereof are parallel to the bottom of the tank body; one end of the reducing air inlet is thin, the other end of the reducing air inlet is thick, the thin end extends into the tank body and is communicated with the center of the flue gas pipeline, and the reducing air inlet is connected with the flue gas pipeline through a bearing; two clapboards are fixedly connected below the middle part of the tank body, and a plurality of holes are formed in the clapboards; the upper part of the tank body is provided with an absorption liquid inlet; the bottom of the tank body is provided with an absorption liquid outlet; the center of the top of the tank body is provided with an air outlet. The advantages are that: reasonable structure, absorbs the smoke through the device and carries out component measurement, not only the accuracy is extremely high, and with low costs, easy and simple to handle.

Description

A high-efficient absorbing device for flue gas composition detects

Technical Field

The utility model belongs to smoke composition detection area especially relates to a high-efficient absorbing device for smoke composition detects.

Background

At present, with increasingly strict environmental requirements, waste gas discharged by domestic steel is sequentially listed in an environmental protection online monitoring range, the concentration of dust, sulfur dioxide, nitric oxide and the like in the discharged flue gas must meet the ultralow emission requirement, and the harmful elements in the flue gas need to be strictly controlled. On the other hand, in recent years, some steel enterprises gradually change the dust removal process of blast furnace gas from wet dust removal to dry dust removal, so that the chlorine content in the blast furnace gas is obviously increased, the subsequent users of the gas, such as the flue gas emission of a heating furnace and a power plant, are affected, corrosive substances in the flue gas are increased, and the equipment and the environment are seriously affected. Thirdly, with the implementation of a new environmental protection method, the treatment capacity of hazardous wastes in various regions throughout the country is saturated, some steel enterprises are forced to adopt self-existing kilns to treat the hazardous wastes, some toxic and harmful substances are discharged along with flue gas, so that the components of the flue gas become more complex, the types of harmful elements in the flue gas are not limited to conventional sulfur, chlorine and nitrogen oxide elements, and the detection and analysis requirements on the components of the flue gas are more complicated and diversified.

Based on the problems to be solved in the production, the research on the content of some harmful elements in the smoke has important significance. Some harmful elements exist in the smoke, but the content is extremely low, the trace elements are difficult to accurately detect by a conventional method, when the existing advanced methods such as an infrared spectroscopy method and the like are adopted for analysis and test, because the content is extremely low, the interference of other gases is easy to cause the inaccuracy of the test and analysis result, and in practice, the results of measuring the same smoke by using different gas analyzers even have a difference of more than 100 percent and obviously exceed the range of the fluctuation of smoke components. On the other hand, some harmful elements are hidden in the smoke in the form of extremely small particles, and the conventional spectroscopic gas analyzer cannot identify the harmful elements and can also cause inaccurate analysis results, which are some of the disadvantages of the spectroscopic gas analyzer. Relatively speaking, it is a more accurate, reliable, simple and convenient method to adopt the harmful element in the good absorption liquid of preconfiguration to absorb flue gas, but present conventional flue gas absorbing device all has some drawbacks, namely, because the air current is not enough with the absorption liquid contact in the absorption process to the contact time is very short, causes the harmful element in the flue gas to absorb incompletely, and this problem can't thoroughly be solved all the time.

In the prior art, chinese patent 201220282495.8 discloses a front-mounted heat-tracing ammonia absorption device of an ammonia desulfurization flue gas emission monitoring and analyzing mechanism, which can realize NH in principle ₃ Chemically react with phosphoric acid, but the reaction hardly proceeds sufficiently under the conditions of the apparatus of the utility model. Because, when the gas enters the absorption liquid through the gas flow input pipe, the bubbles formed in the solution by the gas quickly float to the surface of the solution, the reaction time is very short and is instantaneous, which is one of the main factors causing the reaction to be insufficient. In addition, the formed bubbles are large under the influence of the flow rate and the pipe diameter of the gas, only the part of the edge of the bubbles, which is contacted with the absorption liquid, can preferentially carry out chemical reaction in the floating process of the bubbles, and part of NH in the middle of the bubbles ₃ The gas molecules cannot react with phosphoric acidThe reaction efficiency is very low under the condition of the device and the absorption effect is not ideal. Chinese patent 200810058792.2 discloses a method for measuring heavy metal elements in cigarette smoke by using a smoke trapping and absorbing device, wherein the retention time of the smoke in a trapping agent is slightly prolonged, the smoke is dispersed by a sieve plate and buffered by a buffer filler, the surface area of smoke absorption is increased, and smoke components are absorbed more fully compared with a conventional absorbing device. However, the time of the smoke in the trapping agent is not long enough, and the components in the gas cannot be completely absorbed only by the action of the sieve plate.

Disclosure of Invention

For overcoming the not enough of prior art, the utility model aims at providing a high-efficient absorbing device for smoke composition detects, the absorber adopts the cross flue structure, increases the area of contact of flue gas and absorption liquid, makes things convenient for harmful element's entrapment in the flue gas, improves smoke composition test analysis's accuracy.

In order to achieve the above object, the utility model discloses a following technical scheme realizes:

a high-efficiency absorption device for detecting smoke components comprises a smoke inlet, an air pump, an absorber and a smoke outlet which are sequentially connected, wherein the absorber comprises a variable-diameter air inlet, a smoke pipeline, a partition plate, a tank body, an air outlet and an absorption liquid outlet; one end of the reducing air inlet is thin, the other end of the reducing air inlet is thick, the thin end extends into the tank body and is communicated with the center of the flue gas pipeline, and the reducing air inlet is connected with the flue gas pipeline through a bearing; two clapboards are fixedly connected below the middle part of the tank body, and a plurality of holes are formed in the clapboards; the upper part of the tank body is provided with an absorption liquid inlet; the bottom of the tank body is provided with an absorption liquid outlet; the center of the top of the tank body is provided with an air outlet.

The aperture of the holes is 1-2 mm, and the distance between adjacent holes is 5-10 mm.

A smoke filtering screen is fixed in the reducing air inlet.

The two absorbers are provided, and the air outlet of the lower absorber is connected with the variable diameter air inlet of the upper absorber.

The minimum size of the reducing air inlet is R, the inner diameter of each branch pipeline of the flue gas pipeline is R, and R is less than 0.5R.

The end part of the branch pipeline is connected with a small pipeline, the branch pipeline and the small pipeline are perpendicular to each other, and the small pipeline is parallel to the bottom of the tank body.

The absorber is made of acid and alkali corrosion resistant materials.

And the smoke outlet is connected with a flow meter.

Compared with the prior art, the beneficial effects of the utility model are that:

a high-efficient absorbing device for flue gas composition detects is rational in infrastructure, has solved some harmful elements or trace element in the current gas absorption check out test set can't the complete absorption gas to the problem of its content of unable accurate determination.

The absorber structure in the device realizes high-speed rotation of the cross flue gas pipeline through the reaction force of the airflow, thereby realizing that the airflow is rapidly dispersed into countless micro bubbles in the absorption liquid, increasing the contact area of the flue gas and the absorption liquid and ensuring that the gas is absorbed more fully; in the process of stirring the cross-shaped flue gas pipeline, due to the rotational flow effect of the absorption liquid in the container, the displacement vector of the transverse relative movement of the bubbles is increased, so that the total stroke of the bubbles in the absorption liquid is increased, and the gas absorption is further promoted; in addition, the rotation of the cross flue gas pipeline and the transverse impulse force of the airflow cause the high-speed rotational flow of the absorption liquid, so that a reaction kinetic condition is provided for the chemical reaction of the gas and the absorption liquid, and the reaction is further accelerated. Two layers of partition boards with dense holes are arranged at the middle lower part of the reaction tank, so that the size of bubbles is further reduced, the number of bubbles is increased, and the absorption reaction time is prolonged, thereby promoting gas absorption. In addition, an upper reaction tank and a lower reaction tank are connected in series in the absorber, so that harmful elements or trace elements in the flue gas are ensured to be absorbed more thoroughly. The device absorbs the smoke and measures the components, so that the accuracy is extremely high, the cost is low, and the operation is simple and convenient.

Drawings

Fig. 1 is a connection block diagram of the present invention.

Fig. 2 is a schematic view of the structure of the absorber.

In the figure: 1-1# tank reducing air inlet 2-1# tank air outlet hole 3-1# tank baffle I4-1 # tank baffle II 5-1# tank body 6-1# tank absorption liquid inlet 7-1# tank air outlet 8-1# tank absorption liquid outlet 9-1# tank flue gas pipeline 10-1# tank hole 11-2# tank reducing air inlet 12-2# tank air outlet hole 13-2# tank baffle I14-2 # tank baffle II 15-2# tank body 16-2# tank absorption liquid inlet 17-2# tank air outlet 18-2# tank absorption liquid outlet 19-2# tank flue gas pipeline 20-flue gas filter screen.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings, but it should be noted that the present invention is not limited to the following embodiments.

Referring to fig. 1 and 2, the high-efficiency absorption device for detecting the components of the flue gas comprises a flue gas inlet, an air suction pump, an absorber and a flue gas outlet which are connected in sequence, wherein the flue gas outlet is connected with a flow meter. The absorber is two, is 1# jar, 2# jar respectively, and the gas outlet and the 2# jar reducing air inlet 11 of 1# jar are connected.

1# jar inside has the 1# jar reducing air inlet 1 most thin end of flue gas filter screen 20 and stretches into 1# jar internal 5 inside, intercommunication 1# jar flue gas pipeline 9, flue gas pipeline is the cross, center department and 1 intercommunication of 1# jar reducing air inlet, 1# jar flue gas pipeline 9 divide into four branch road pipelines, every branch road pipeline all has a small pipeline, branch road pipeline and small pipeline mutually perpendicular intercommunication, small pipeline and jar body bottom parallel arrangement, the small pipeline is for preventing the adverse current hole. 1# jar reducing air inlet 1 passes through the bearing with 1# jar flue gas pipeline 9 and is connected, can guarantee 1# jar flue gas pipeline 9 free rotation. Two clapboards are arranged below the middle part of the tank body 5 of the tank 1# namely a tank clapboard I3 of the tank 1# and a tank clapboard II 4 of the tank 1# which are provided with dense small holes 10, the aperture of each small hole 10 is 1-2 mm, and the distance between adjacent holes is 5-10 mm. The upper part of the No. 1 tank body 5 is provided with a No. 1 tank absorption liquid adding port 6,1, the bottom of the No. 1 tank body 5 is provided with a No. 1 tank absorption

liquid discharging port

8,1, and the center of the top of the No. 1 tank body 5 is provided with a No. 1 tank air outlet 7. 11 very thick ends of 2# jar reducing air inlet are connected to 1# jar gas outlet 7, and 2# jar reducing air inlet 11 very thin ends stretch into 2# jar internal portion of jar, and 2# jar structure is the same with 1# jar structure. The minimum size of the inner diameters of the 1# tank reducing air inlet 1 and the 2# tank reducing air inlet 11 is recorded as R, the inner diameter of each branch pipeline of the 1# tank flue gas pipeline 9 and the 2# tank flue gas pipeline is recorded as R, and R is less than 0.5R.

The installation position of 1# jar flue gas pipeline 9 and 2# jar flue gas pipeline presses close to the bottom of the 1# jar body 5 and the 2# jar body as far as, guarantees that 1# jar flue gas pipeline 9 and 2# jar flue gas pipeline can rotate along with the axle can.

The absorber is made of acid and alkali corrosion resistant materials, such as: polytetrafluoroethylene, polytetramethylene adipamide, polyetheretherketone, and the like.

And preparing corresponding absorption liquid according to the target elements in the smoke to be measured. Taking the determination of the chlorine content in the flue gas as an example, the configured excess concentration is the% of NaOH +15% Ca (OH) ₂ A few drops of phenolphthalein indicator is added into the absorption liquid, the No. 1 tank absorption liquid adding port 6 and the No. 2 tank absorption liquid adding port are opened, and the prepared absorption liquid is respectively added into the No. 1 tank body 5 and the No. 2 tank body, so that the liquid level of the absorption liquid reaches 2/3 of the height of the tank body. After the flue gas inlet, the air suction pump, the absorber, the flow meter and the flue gas outlet are connected in sequence, the valves of the air suction pump and the flue gas inlet are opened, and the numerical value of the flow meter at the moment is recorded. And as the concentration of the alkali liquor exceeds the color change range of the indicator, the absorption liquid in the tank body 5 of the tank 1 gradually turns red from colorless along with the reaction, the introduction of the flue gas is stopped after the liquid in the tank body of the tank 2 does not change color or slightly turns red, the flue gas inlet valve and the air suction pump are closed, and the numerical value of the flow meter is recorded again. And opening valves of the No. 1 tank absorption liquid outlet 8 and the No. 2 tank absorption liquid outlet, taking out all absorption liquids, adding the prepared unused absorption liquid into a volumetric flask for constant volume, fully shaking up, and then measuring the chlorine content by using a potentiometric titrator ICP-MS. And finally, calculating the chlorine content in the flue gas according to the measured content data, the gas flow and the liquid volume parameters to obtain a final result.

Claims

1. A high-efficiency absorption device for detecting smoke components is characterized by comprising a smoke inlet, an air suction pump, an absorber and a smoke outlet which are sequentially connected, wherein the absorber comprises a variable-diameter air inlet, a smoke pipeline, a partition plate, a tank body, an air outlet and an absorption liquid outlet; one end of the reducing air inlet is thin, the other end of the reducing air inlet is thick, the thin end extends into the tank body and is communicated with the center of the flue gas pipeline, and the reducing air inlet is connected with the flue gas pipeline through a bearing; two clapboards are fixedly connected below the middle part of the tank body, and a plurality of holes are formed in the clapboards; the upper part of the tank body is provided with an absorption liquid inlet; the bottom of the tank body is provided with an absorption liquid outlet; the center of the top of the tank body is provided with an air outlet.

2. The efficient absorption device for smoke component detection according to claim 1, wherein the aperture of said holes is 1-2 mm, and the distance between adjacent holes is 5-10 mm.

3. The efficient absorption device for smoke component detection according to claim 1, wherein a smoke filtering screen is fixed in the reducing air inlet.

4. The efficient absorption device for smoke component detection according to claim 1, wherein the number of the absorbers is two, and the air outlet of the lower absorber is connected with the variable diameter air inlet of the upper absorber.

5. The efficient absorption device for smoke component detection according to claim 1, wherein the minimum size of the variable diameter gas inlet is R, the inner diameter of each branch pipe of the smoke pipe is R, and R is less than 0.5R.

6. The efficient absorption device for smoke component detection according to claim 1, wherein a small pipe is connected to an end of the branch pipe, the branch pipe and the small pipe are perpendicular to each other, and the small pipe is parallel to the bottom of the tank body.

7. The efficient absorption device for smoke component detection according to claim 1, wherein said absorber is made of acid and alkali corrosion resistant material.

8. The efficient absorption device for smoke component detection according to claim 1, wherein a flow meter is connected to said smoke outlet.