CN209858296U - Coal-fired flue gas pretreatment system - Google Patents
Coal-fired flue gas pretreatment system Download PDFInfo
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- CN209858296U CN209858296U CN201920102581.8U CN201920102581U CN209858296U CN 209858296 U CN209858296 U CN 209858296U CN 201920102581 U CN201920102581 U CN 201920102581U CN 209858296 U CN209858296 U CN 209858296U
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Abstract
The utility model belongs to flue gas preliminary treatment field, especially a coal-fired flue gas pretreatment system. The system comprises a flow control device connected to the flue, a reaction container connected behind the flow control device, and a tail gas treatment device connected behind the reaction container; the automatic reaction liquid updating system comprises a reaction liquid updating device and a detection control device for controlling the automatic updating of the reaction liquid. The reaction liquid updating device comprises a fresh test liquid storage bottle, a first peristaltic pump, a second peristaltic pump and a waste liquid storage bottle, the detection control device for controlling the automatic updating of the reaction liquid comprises a pH detector with a pH probe and a control system, and the control system controls the first peristaltic pump and the second peristaltic pump to work simultaneously through the indication of the pH detector to realize the automatic updating of the liquid in the reaction container. This application can realize the reaction liquid and update in real time through reaction liquid automatic update system for whole tail gas processing apparatus is in high-efficient state.
Description
Technical Field
The utility model belongs to flue gas preliminary treatment field, especially a coal-fired flue gas pretreatment system.
Background
China is a big country taking coal as main production and consumption energy, and the national statistical office publishes a national economic and social development statistical bulletin in 2017, which is published in 2018, indicates that the yield of raw coal in China in 2017 reaches 35.2 hundred million tons, which is 3.3 percent higher than that in the last year. In a short time, the status of coal as the main energy of China does not change, and the total quantity of coal demand is on the rising trend.
Coal is used as primary energy, and the main utilization mode is combustion in China. The vast majority of large power stations in China are coal-fired power stations, and the coal-fired flue gas contains SO2And HCl, which are released into the atmosphere, can harm human health and pose a serious environmental problem.
SO discharged to the atmosphere2Will oxidize and eventually form acid rain, corrode the environment, including metals and buildings, and greatly reduce the service life. Acidification of soil and water area can lead to yellowing of plant leaves and large-area withering and death of plants. SO (SO)2After reaching a certain concentration, the medicine can harm the respiratory organs of people, stimulate the tissues of human bodies, cause secretion increase and inflammation, and cause the diseases of the respiratory organs.
Hydrogen chloride, as an irritant gas, is very soluble in water to form hydrochloric acid. The catalyst has strong corrosivity, is easy to react with active metal powder to generate hydrogen, can form an explosive mixture with air, and generates highly toxic hydrogen cyanide when meeting cyanide, thereby causing environmental problems. The chlorine element in the coal can corrode equipment in the coal combustion process, and precipitates can be generated in the equipment when the content of the chlorine element is too high, so that the research on the absorption control technology of the chlorine element has great significance for the utilization of the coal and the environmental protection.
The existing flue gas pretreatment system generally adopts a packed tower and has the characteristics of high production capacity, high separation efficiency, high operation elasticity and the like. SO in flue gas2And the sulfur dioxide is fully absorbed and reacted with a desulfurizer solution under the condition of better mass transfer in the tower, so that the concentration of sulfur dioxide in the flue gas is greatly reduced, and the aim of desulfurization is fulfilled. However, the reaction liquid is gradually ineffective in the removing process, and if the reaction liquid is changed at irregular time, the fluctuation of smoke components is easy to be large, and the subsequent measurement can be influenced. And frequent replacement can make the experimental process more tedious, influence the accuracy and the stability of experiment.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem who solves provides a coal-fired flue gas pretreatment systems.
Realize the utility model discloses the technical solution of purpose does:
a coal-fired flue gas pretreatment system comprises a flow control device connected to a flue, a reaction container connected behind the flow control device, and a tail gas treatment device connected behind the reaction container;
the automatic reaction liquid updating system is used for automatically updating liquid in the reaction container and comprises a reaction liquid updating device and a detection control device for controlling the automatic updating of the reaction liquid.
Further, the reaction solution updating device comprises a fresh test solution storage bottle, a first peristaltic pump, a second peristaltic pump and a waste solution storage bottle, wherein the fresh test solution storage bottle is connected with the liquid inlet of the reaction container through the first peristaltic pump and a connecting pipeline, and the waste solution storage bottle is connected with the liquid outlet of the reaction container through the second peristaltic pump and the connecting pipeline.
Further, the liquid inlet in the reaction container (3) is higher than the liquid outlet.
Furthermore, the detection control device for controlling the automatic update of the reaction liquid comprises a pH detector with a pH probe and a control system, wherein the pH probe extends into the reaction liquid in the reaction container and is used for detecting the pH of the reaction liquid, the pH detector, the first peristaltic pump and the second peristaltic pump are connected with the control system, and the control system controls the first peristaltic pump and the second peristaltic pump to work simultaneously through the indication of the pH detector, so that the automatic update of the liquid in the reaction container is realized.
Further, the flow control device is used for controlling the flow of the flue gas and comprises an air pump and a flow meter; when the pressure in the flue is higher, the air pump does not operate, and the flow of the flue gas is adjusted and controlled by the flowmeter; when the internal pressure of the flue is small, the air pump operates to control the flow of the flue gas entering the test system in cooperation with the flowmeter.
Furthermore, the tail gas treatment device is internally provided with a device for adsorbing Hg0The adsorbent of (1).
Furthermore, the flue gas in the reaction container is in long pipe inlet and short pipe outlet.
Furthermore, the tail end of the long tube is provided with a porous bulb.
Further, be equipped with the magnetic stirring stick in the reaction container, realize flue gas and reaction liquid fully to contact through the stirring effect of magnetic stirring stick.
A method for pretreating coal-fired flue gas by using the system specifically comprises the following steps:
step one, assembling a system, preparing corresponding reaction liquid and standard solution in advance, and filling the reaction liquid and the standard solution into corresponding containers; the tail gas treatment device is filled with the Hg adsorption0The adsorbent is used for calibrating the pH detector to ensure the accuracy;
step two, connecting the system with a flue, and controlling a flow control device to enable the total test flue gas flow to be 1-3L/min;
step three, starting a pH detector and starting an automatic reaction liquid updating system;
and step four, after the reaction is finished, disconnecting the flue from the system, then disconnecting the components one by one, cleaning all the components, and storing properly.
Compared with the prior art, the utility model, it is showing the advantage:
(1) the gas pretreatment device can realize the real-time update of the reaction liquid through the automatic reaction liquid updating device, so that the whole tail gas treatment device is in a high-efficiency state. Ensuring SO2And HCl is removed more thoroughly, so that the effectiveness of tail gas treatment is ensured.
(2) The pH value of the reaction liquid can be monitored in real time by adopting the pH detector, so that the reaction liquid is always in an alkaline state, the adsorption effect is ensured, and efficient adsorption can be continued.
(3) The reaction liquid and SO are stirred by a magnetic stirring rod2And the HCl is fully mixed, so that the high-efficiency removal can be realized. And the gas is pretreated, so that the maintenance workload of the daily equipment is greatly reduced, and the accuracy of gas test analysis is improved.
(4) The application can meet the requirement of SO of the coal-fired flue gas2And the efficient absorption with HCl also reduces the labor cost for replacing the reaction liquid, and the components of the reaction liquid are updated in real time, so that the gas pretreatment is more efficient.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a coal combustion flue gas pretreatment system.
Description of reference numerals:
the device comprises a flue 1, a flow control device 2, a reaction container 3, a pH probe 4, a pH detector 5, a magnetic stirring rod 6, a first peristaltic pump 7, a fresh test solution storage bottle 8, a second peristaltic pump 9, a waste liquid storage bottle 10 and a tail gas treatment device 11.
Detailed Description
The present application will be further described with reference to the following drawings and examples.
The application relates to a coal-fired flue gas pretreatment method and a coal-fired flue gas pretreatment device, which can improve the gas pretreatment efficiency and reduce the cost. As shown in the figure: the device mainly comprises a flow control device (2) connected to a flue (1), a reaction container (3), a pH detector (5), a first peristaltic pump (7), a fresh test solution storage bottle (8), a second peristaltic pump (9), a waste liquid storage bottle (10) and a tail gas treatment device (11).
The pH detector (5) controls the first peristaltic pump (7) and the second peristaltic pump (9) to operate through the control system, when the indication value of the pH detector (5) is smaller than a certain reference value, the control system controls the first peristaltic pump (7) and the second peristaltic pump (9) to operate, and when the indication value of the pH detector (5) is larger than the certain reference value, the control system controls the first peristaltic pump (7) and the second peristaltic pump (9) to stop working. The flow control device (2) comprises an air pump and a flowmeter, the flow of the flue gas is controlled, when the pressure in the flue is higher, the air pump does not operate, and the flowmeter is used for adjusting and controlling the flow of the flue gas; when the internal pressure of the flue is small, the air pump operates to control the flow of the flue gas entering the test system in cooperation with the flowmeter.
Strong alkaline solution such as NaOH solution is contained in the reaction container (3), the flue gas in the flue (1) is introduced into the reaction container (3), the flue gas is in full contact reaction with the NaOH solution, HCl in the flue gas is easy to dissolve in water, and the alkaline solution is in contact with acidic gases such as HCl and SO2A neutralization reaction takes place, wherein the main reactions taking place are: r (1) -R (3).
NaOH+HCl→NaCl+H2O R(1)
2NaOH+SO2→Na2SO3+H2O R(2)
2Na2SO3+O2→2Na2SO4 R(3)
The NaOH solution preparation related to the device is at least prepared from analytically pure (red label secondary product, high purity) reagents and deionized water.
The liquid level of the reaction container (3) is one third to two thirds of the height of the bottle, the smoke to be measured enters from the long pipe and exits from the short pipe, the tail end of the long pipe is provided with the porous bulb, and the magnetic stirring rod (6) is arranged in the reaction container (3) so as to achieve the purposes of full contact and full reaction of the smoke and the reaction liquid.
Wherein an automatic reaction solution renewing apparatus should be disposed between the reaction vessel (3) and the fresh sample solution storage bottle (8) and the waste solution storage bottle (10), and the operation principle thereof will be described below by taking the automatic reaction solution renewing apparatus connected to the reaction vessel (3) as an example.
The fresh test solution storage bottle (8) and the first peristaltic pump (7) are matched liquid inlet devices, wherein the reaction container (3) and the fresh test solution storage bottle (8) are used for containing corresponding standard solutions, and the second peristaltic pump (9) and the waste liquid storage bottle (10) are liquid outlet devices. And controlling the reaction liquid to automatically update the running condition of the device according to the indication value of the pH detector (5). When the indication value of the pH detector (5) is smaller than the reference value, standard liquid in a fresh test solution storage bottle (8) enters a reaction container (3) through a first peristaltic pump (7), waste liquid in the reaction container (3) enters a waste liquid storage bottle (10) through a second peristaltic pump (9), and the liquid inlet flow and the liquid outlet flow are kept consistent; when the indication value of the pH detector (5) is larger than the reference value, the first peristaltic pump (7) and the second peristaltic pump (9) stop running. When the reaction liquid automatic updating device is controlled to operate, the difference between the rotating speeds of the first peristaltic pump (7) and the second peristaltic pump (9) is not more than three percent, so that the liquid level in the reaction container (3) is ensured to be in a stable state.
The tail gas treatment device (11) is provided with a device for adsorbing Hg0The adsorbent (e.g. activated carbon) can be used for treating the tail gas of other components in the flue gas, so that the influence of other unabsorbed components in the tail gas on the environment is avoided.
The utility model relates to a coal-fired flue gas pretreatment method and a device, which mainly comprises the following steps:
step one, the device is assembled according to requirements, and corresponding reaction liquid and standard solution are prepared in advance and are filled into corresponding containers. The tail gas treatment device (11) is filled with adsorbed Hg0The adsorbent (5), such as activated carbon, is calibrated to ensure accuracy.
And step two, connecting the device with a flue (1), and controlling a flow control device (2) to enable the total test flue gas flow to be 1-3L/min.
And step three, starting a pH detector (5), and starting a solution automatic updating device, which mainly comprises a first peristaltic pump (7), a second peristaltic pump (9), a fresh test solution storage bottle (8) and a waste liquid storage bottle (10).
And step four, after the reaction is finished, disconnecting the flue (1) from the devices, then disconnecting the devices one by one, cleaning all the devices, and storing properly.
Claims (9)
1. A coal-fired flue gas pretreatment system is characterized by comprising a flow control device (2) connected to a flue (1), a reaction container (3) connected behind the flow control device (2), and a tail gas treatment device (11) connected behind the reaction container (3);
the automatic reaction liquid updating system is used for automatically updating liquid in the reaction container (3) and comprises a reaction liquid updating device and a detection control device for controlling the automatic updating of the reaction liquid.
2. The system according to claim 1, wherein the reaction solution renewing device comprises a fresh sample solution storage bottle (8), a first peristaltic pump (7), a second peristaltic pump (9) and a waste solution storage bottle (10), the fresh sample solution storage bottle (8) is connected with the liquid inlet of the reaction container (3) through the first peristaltic pump (7) and a connecting pipeline, and the waste solution storage bottle (10) is connected with the liquid outlet of the reaction container (3) through the second peristaltic pump (9) and the connecting pipeline.
3. A system according to claim 2, wherein the liquid inlet is at a higher level than the liquid outlet in the reaction vessel (3).
4. The system according to claim 3, wherein the detection control device for controlling the automatic update of the reaction liquid comprises a pH detector (5) with a pH probe (4) and a control system, the pH probe (4) extends into the reaction liquid in the reaction container (3) for detecting the pH of the reaction liquid, the pH detector (5), the first peristaltic pump (7) and the second peristaltic pump (9) are connected with the control system, and the control system controls the first peristaltic pump (7) and the second peristaltic pump (9) to work simultaneously through the indication of the pH detector (5) to realize the automatic update of the liquid in the reaction container (3).
5. The system according to claim 1, characterized in that said flow control means (2) are used to control the flow of flue gases, comprising a gas pump and a flow meter; when the pressure in the flue (1) is higher, the air pump does not operate, and the flow of the flue gas is adjusted and controlled by the flowmeter; when the internal pressure of the flue is small, the air pump operates to control the flow of the flue gas entering the test system in cooperation with the flowmeter.
6. The system according to claim 1, characterized in that the exhaust gas treatment device (11) is equipped with an adsorption device for Hg0The adsorbent of (1).
7. The system according to claim 1, characterized in that the flue gas in the reaction vessel (3) is long-pipe in and short-pipe out.
8. The system of claim 7, wherein the elongated tube end is fitted with a porous bulb.
9. The system according to claim 1, characterized in that a magnetic stirring rod (6) is arranged in the reaction vessel (3), and the flue gas is fully contacted with the reaction liquid through the stirring action of the magnetic stirring rod (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920102581.8U CN209858296U (en) | 2019-01-22 | 2019-01-22 | Coal-fired flue gas pretreatment system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920102581.8U CN209858296U (en) | 2019-01-22 | 2019-01-22 | Coal-fired flue gas pretreatment system |
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| CN209858296U true CN209858296U (en) | 2019-12-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109668766A (en) * | 2019-01-22 | 2019-04-23 | 南京理工大学 | A kind of coal-fired flue-gas pretreatment system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109668766A (en) * | 2019-01-22 | 2019-04-23 | 南京理工大学 | A kind of coal-fired flue-gas pretreatment system and method |
| CN109668766B (en) * | 2019-01-22 | 2024-02-13 | 南京理工大学 | Coal-fired flue gas pretreatment system and method |
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