CN113617196B

CN113617196B - Flue gas desulfurization experiment simulation device

Info

Publication number: CN113617196B
Application number: CN202110783805.8A
Authority: CN
Inventors: 朱清玮; 杨正波; 戚婷婷
Original assignee: Beijing New Building Material Group Co Ltd
Current assignee: Beijing New Building Material Group Co Ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2022-08-19
Anticipated expiration: 2041-07-12
Also published as: CN113617196A

Abstract

The flue gas desulfurization experiment simulation device comprises a simulated flue gas component, a flue gas absorption component and a flue gas collection component; the flue gas absorption component comprises an absorption tower, a slurry pool arranged at the bottom of the absorption tower, an exhaust port arranged at the top of the absorption tower, a spraying mechanism arranged inside the absorption tower, and an oxygen supply unit communicated with the cavity wall of the absorption tower, wherein the oxygen supply unit is used for conveying oxygen into the absorption tower; the exhaust port is communicated with the smoke collecting component through an exhaust pipeline; the slurry tank contains a desulfurization solution with a set concentration, and the cavity wall of the slurry tank is communicated with the inlet of the spraying mechanism through a conveying pipeline so as to convey the desulfurization solution to the spraying mechanism; the simulated flue gas component is provided with a sulfur dioxide gas storage tank, and the sulfur dioxide gas storage tank is communicated with the cavity wall of the absorption tower through a flue gas conveying pipeline so as to convey sulfur dioxide gas into the absorption tower. The device is convenient for adjust the parameter that influences desulfurization gypsum crystal form in real time, reduces the recovery cost.

Description

Flue gas desulfurization experiment simulation device

Technical Field

This writing relates to but not limited to retrieves technical field, especially relates to a flue gas desulfurization experiment analogue means.

Background

The desulfurized gypsum is a product obtained after flue gas desulfurization of a coal-fired power plant. With the continuous improvement of the recovery technology, the desulfurized gypsum can basically replace natural gypsum and be fully and widely reused. However, desulfurized gypsum tends to exhibit different crystal morphologies and dimensions due to the influence of various factors such as the coal, the desulfurizing agent, and the desulfurization process. The application of desulfurized gypsum in different crystal forms in different industries to obtain different products, particularly in the gypsum board building material industry, can lead to uneven quality of the obtained products. Therefore, when the desulfurized gypsum is applied to the gypsum board building material industry, the crystal morphology of the desulfurized gypsum needs to be strictly controlled.

However, the control of the crystal morphology of the desulfurized gypsum is a complicated process and is influenced by various factors, such as the state of the desulfurizing agent, the temperature of the slurry during the desulfurization operation, the supersaturation degree of the slurry, the residence time of the slurry in the slurry tank, the amount of oxidizing air, and the PH. In order to control the parameters, a large amount of experiments are required, and based on the problems of cost, daily production and the like, the experiment work of the parameters in a power plant is obviously difficult to realize.

The above description is included in the technical knowledge of the inventors, and does not necessarily constitute a prior art.

Disclosure of Invention

The embodiment of the application provides a flue gas desulfurization experiment simulation device, which comprises a simulated flue gas component, a flue gas absorption component and a flue gas collection component; the flue gas absorption component comprises an absorption tower, a slurry pool arranged at the bottom of the absorption tower, an exhaust port arranged at the top of the absorption tower, a spraying mechanism arranged inside the absorption tower, and an oxygen supply unit communicated with the cavity wall of the absorption tower, wherein the oxygen supply unit is used for conveying oxygen into the absorption tower; the exhaust port is communicated with the smoke collecting component through an exhaust pipeline; the slurry tank contains a desulfurization solution with a set concentration, and the cavity wall of the slurry tank is communicated with the inlet of the spraying mechanism through a conveying pipeline so as to convey the desulfurization solution to the spraying mechanism; the simulation gas fume part is equipped with sulfur dioxide gas storage jar, sulfur dioxide gas storage jar pass through flue gas pipeline with the chamber wall of absorption tower is linked together, in order to carry sulfur dioxide gas in the absorption tower.

After the technical scheme is adopted, the embodiment of the application has the following beneficial effects:

through setting up one set of flue gas desulfurization experiment analogue means, can reappear the simulation to flue gas desulfurization's overall process to adjust in real time the various parameters that influence desulfurization gypsum crystal form, reduce the cost of retrieving and recycling, improve the quality of retrieving the secondary product.

Other aspects will be apparent upon reading and understanding the attached drawings and detailed description.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments herein and are incorporated in and constitute a part of this specification, illustrate embodiments herein and are not to be construed as limiting the embodiments herein.

Fig. 1 is a schematic layout diagram of a flue gas desulfurization experiment simulation apparatus according to an embodiment of the present application.

Reference numerals:

11-absorption tower, 12-slurry pool, 13-exhaust port, 14-spraying mechanism, 15-oxygen supply unit, 16-gas supply unit, and 17-spraying valve;

21-a sulphur dioxide gas storage tank, 22-a heating assembly;

31-a desulfurized gypsum storage bin and 32-a discharge valve;

41-a circulating pool, 42-a circulating pump, 43-a pH value tester and 44-a hydrometer;

51-collecting tank, 52-first valve, 53-flue gas analyzer, 54-second valve.

Detailed Description

The technical scheme is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations.

In the embodiment of the present application, as shown in fig. 1, the embodiment of the present application provides a flue gas desulfurization experiment simulation device, the flue gas desulfurization experiment simulation device includes a simulated flue gas component, a flue gas absorption component and a flue gas collection component. The flue gas absorption component comprises an absorption tower 11, a slurry pool 12 arranged at the bottom of the absorption tower 11, an exhaust port 13 arranged at the top of the absorption tower 11, a spraying mechanism 14 arranged inside the absorption tower 11, and an oxygen supply unit 15 communicated with the cavity wall of the absorption tower 11, wherein the oxygen supply unit 15 is used for conveying oxygen into the absorption tower 11.

The exhaust port 13 is communicated with the flue gas collecting component through an exhaust pipeline, the slurry tank 12 contains a desulfurization solution with a set concentration, and the cavity wall of the slurry tank 12 is communicated with the inlet of the spraying mechanism 14 through a conveying pipeline so as to convey the desulfurization solution to the spraying mechanism 14. The simulated flue gas component is provided with a sulfur dioxide gas storage tank 21, and the sulfur dioxide gas storage tank 21 is communicated with the cavity wall of the absorption tower 11 through a flue gas conveying pipeline so as to convey sulfur dioxide gas into the absorption tower 11.

As shown in the figure, the spraying mechanism 14 may be disposed on the upper portion of the absorption tower 11, the oxygen supply unit 15, the sulfur dioxide gas storage tank 21 and the inlet of the absorption tower 11 are disposed on the lower portion of the absorption tower 11, and according to the actual situation, optionally, a valve, a flow meter or a booster pump or the like is disposed on the delivery pipeline of the oxygen supply unit 15, so as to realize real-time adjustment of various parameters for delivering oxygen into the absorption tower 11, and the flue gas delivery pipeline connected to the sulfur dioxide gas storage tank 21 may also be set with reference, so as to perform real-time adjustment of various parameters of the sulfur dioxide gas. The spraying mechanism 14 is set to have a certain height difference relative to the input port of the oxygen supply unit 15 and the input port of the sulfur dioxide gas, so that the spraying state of the sulfur dioxide absorption liquid can be realized, namely, the desulfurization solution is in a spraying state and is in contact with the sulfur dioxide gas, the contact area of the desulfurization solution and the sulfur dioxide gas is increased, and the sufficient absorption of the sulfur dioxide gas is facilitated. The desulfurization solution can be set as calcium carbonate solution, and the calcium carbonate solution is fully reacted with oxygen and sulfur dioxide gas to generate the required calcium sulfate solution so as to be reutilized for the second time.

Through setting up foretell flue gas desulfurization experiment analogue means, can reappear the simulation to flue gas desulfurization's overall process to adjust in real time the various parameters that influence desulfurization gypsum crystal form, reduce the cost of retrieving and recycling, improve the quality of retrieving the secondary product.

In some exemplary embodiments, in order to improve the absorption efficiency of the sulfur dioxide, the spraying mechanism 14 may be provided with a plurality of nozzles, the plurality of nozzles are distributed at intervals along the height direction of the absorption tower 11, and as shown in fig. 1 for example, the plurality of nozzles are arranged in two layers along the height direction of the absorption tower 11, and a plurality of nozzles may be provided for each layer. A switch valve can be arranged between the two layers of nozzles, and whether the upper layer of nozzles are opened or not is selected according to actual conditions. In addition, a pipeline can be arranged on the cavity wall in the absorption tower 11, the pipeline is arranged along the circumferential direction of the cavity wall in the absorption tower 11, one end of the pipeline is communicated with the slurry pool 12 through a conveying pipeline, the other end of the pipeline is closed, a plurality of nozzles are arranged in an area between two ports of the pipeline, and the angle of the nozzles for spraying the solution into the absorption tower 11 can be preset or can be selected to be adjustable so as to adjust the spraying angle in real time.

In some exemplary embodiments, as shown in fig. 1, the flue gas desulfurization experimental simulation apparatus further includes a desulfurized gypsum discharging component, the desulfurized gypsum discharging component includes a discharging pipeline, a desulfurized gypsum storage bin 31, and a discharging valve 32 disposed on the discharging pipeline, one end of the discharging pipeline is communicated with the cavity wall of the slurry tank 12, and the other end of the discharging pipeline is communicated with the desulfurized gypsum storage bin 31. The desulfurization gypsum discharging part is arranged, so that when the concentration or specific gravity of a product generated after the solution in the slurry tank 12 absorbs sulfur dioxide reaches a certain threshold value, the solution in the slurry tank 12 can be completely output to the desulfurization gypsum storage bin 31 by opening the discharging valve 32, and the next process can be carried out. In some exemplary embodiments, in order to prevent the solution in the slurry tank 12 from depositing due to long-term standing, a gas supply unit 16 is further disposed in the flue gas absorption component, and the gas supply unit 16 is communicated with the bottom of the slurry tank 12 to supply gas into the slurry tank 12, so that the solution in the slurry tank 12 is in a flowing state, deposition is avoided, and the cleaning workload in the later period can also be reduced.

According to the actual situation, the oxygen supply unit 15 and the gas supply unit 16 may be provided as one unit, that is, the unit may supply oxygen into the absorption tower 11 and also supply oxygen into the slurry tank 12 to prevent deposition. Air pumps can also be arranged on the delivery lines of the oxygen supply unit 15 and the gas supply unit 16, and under the pressure of the air pumps, oxygen or air enters the absorption tower 11 and the slurry tank 12 along with small uniform bubbles through the interfaces at the joints and then diffuses into the corresponding spaces.

Of course, the gas supply unit 16 may also input nitrogen or other gases for the purpose of avoiding deposition of the solution, and the kind of the specific gas is not limited herein. Oxygen or air is uniformly diffused into the solution through the air pump, so that the flow of the solution is facilitated, and the mixing effect is improved. The arrangement of the nozzles on the spraying mechanism 14 can also be referred to, a plurality of air injection holes are formed in the slurry tank 12 by utilizing the pipelines, and the angles of the air injection holes can also be set to be different, so that the solution in the slurry tank 12 is always in a disturbed flow state.

In order to prevent the solution in the slurry tank 12 from flowing back into the gas supply unit 16 through the connection and affecting the service life of the electrical components in the gas supply unit 16, a check valve may be provided on the connection pipeline between the gas supply unit 16 and the slurry tank 12.

In some exemplary embodiments, as shown in fig. 1, the flue gas desulfurization experimental simulation apparatus further includes a desulfurizing agent circulating component, the desulfurizing agent circulating component includes a circulating tank 41 and a circulating pump 42, the slurry tank 12 is communicated with the circulating tank 41 through the circulating pump 42, and the circulating pump 42 circulates the solution in the slurry tank 12 and the circulating tank 41. With the sulfur dioxide absorption solution and the product that produces after the absorption, carry out reciprocal circulation flow between slurry pond 12 and circulation pond 41, can improve sulfur dioxide absorption solution, the utilization ratio of desulfurization solution promptly, in addition, can set up corresponding detection device in circulation pond 41 to carry out real-time monitoring to the flue gas absorption operation, can not influence absorption tower 11 etc. to the normal absorption operation of flue gas, improve the operating efficiency of the whole operation link of flue gas absorption.

In some exemplary embodiments, as shown in fig. 1, the desulfurizing agent circulating unit further includes a PH tester 43 and a gravimeter 44, the PH tester 43 is disposed in the circulating tank 41 to monitor PH of the solution in the circulating tank 41 in real time, and the gravimeter 44 is disposed in the circulating tank 41 to monitor specific gravity of the solution in the circulating tank 41 in real time. In some exemplary embodiments, as shown in fig. 1, a spray valve 17 is disposed on the delivery line, and when the specific gravity gauge 44 detects that the specific gravity of the solution is greater than or equal to a first set threshold value, the spray valve 17 is closed and the discharge valve 32 is opened. Wherein the first set threshold may be set to 1150kg/m ³ Of course, the first set threshold value may be appropriately adjusted according to the set type of the flue gas desulfurization experiment simulation device, for example, a small-sized flue gas desulfurization experiment simulation device, a medium-sized flue gas desulfurization experiment simulation device, or the like.

In some exemplary embodiments, as shown in FIG. 1, the flue gas collecting component comprises a collecting tank 51, a first valve 52 and a flue gas analyzer 53 disposed on the discharge line, and the exhaust port 13 passes through the discharge line and the collecting tankThe collecting pool 51 is communicated with the flue gas analyzer 53 for monitoring the concentration of the flue gas. In some exemplary embodiments, the flue gas collecting unit further includes a flue gas circulation line and a second valve 54 disposed on the flue gas circulation line, one end of the flue gas circulation line is communicated with the exhaust line, and the other end of the flue gas circulation line is communicated with the flue gas conveying pipe, and when the concentration of the flue gas detected by the flue gas analyzer 53 is greater than or equal to a second set threshold value, the first valve 52 is closed and the second valve 54 is opened. An alkaline solution, such as a calcium hydroxide solution, a sodium hydroxide solution, etc., may be disposed in the collection tank 51 to absorb and recycle substances in the flue gas after desulfurization treatment, thereby improving the resource recycling rate and the comprehensive benefits of production. Wherein the second set threshold may be set to 0.15mg/m ³ I.e. when the concentration of the flue gas monitored by the flue gas analyzer 53 is greater than or equal to 0.15mg/m ³ When the flue gas does not meet the emission standard, the flue gas needs to be subjected to secondary desulfurization treatment, the first valve 52 needs to be closed to temporarily close the emission pipeline, and the second valve 54 is opened to secondarily convey the flue gas which does not meet the standard to the flue gas conveying pipeline, so as to convey the flue gas into the absorption tower 11. When the concentration of the flue gas monitored by the flue gas analyzer 53 is less than 0.15mg/m ³ At this time, the first valve 52 is opened and the second valve 54 is closed.

In some exemplary embodiments, as shown in fig. 1, for a more realistic simulated flue gas, the simulated flue gas component further comprises a heating assembly 22, which heating assembly 22 is arranged on the flue gas conveying duct for heating the sulphur dioxide gas. The heating assembly 22 may be selected from heating devices commonly used in manufacturing, such as infrared heaters.

In addition, in order to carry out real-time monitoring to the use amount of each relevant gas or solution, a flowmeter can be arranged on a corresponding conveying pipeline, a unified control unit can be arranged for improving the automation degree of the flue gas desulfurization experiment simulation device, and each parameter needing to be monitored is adjusted in real time by utilizing the control unit, so that the efficiency of experiment simulation is improved.

In the description herein, the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing embodiments of the present application and simplifying the description, but do not indicate or imply that the structures referred to have a particular orientation, are configured and operated in a particular orientation, and thus, should not be construed as limiting the present disclosure.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly and, for example, may be fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, or may be connected through two elements. The specific meaning of the above terms herein can be understood in a specific context to one of ordinary skill in the art.

Although the embodiments disclosed herein are described above, the descriptions are only for the convenience of understanding the embodiments and are not intended to limit the disclosure. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure, and that the scope of the disclosure herein is to be limited only by the appended claims.

Claims

1. A flue gas desulfurization experiment simulation device is characterized by comprising a simulated flue gas component, a flue gas absorption component, a flue gas collection component and a desulfurizer circulation component;

the flue gas absorption component comprises an absorption tower (11), a slurry pool (12) arranged at the bottom of the absorption tower (11), an exhaust port (13) arranged at the top of the absorption tower (11), a spraying mechanism (14) arranged inside the absorption tower (11), and an oxygen supply unit (15) communicated with the cavity wall of the absorption tower (11), wherein the oxygen supply unit (15) is used for conveying oxygen into the absorption tower (11);

the exhaust port (13) is communicated with the smoke collecting component through an exhaust pipeline; the slurry tank (12) contains a desulfurization solution with a set concentration, and the cavity wall of the slurry tank (12) is communicated with the inlet of the spraying mechanism (14) through a conveying pipeline so as to convey the desulfurization solution to the spraying mechanism (14);

the simulated flue gas component is provided with a sulfur dioxide gas storage tank (21), and the sulfur dioxide gas storage tank (21) is communicated with the cavity wall of the absorption tower (11) through a flue gas conveying pipeline so as to convey sulfur dioxide gas into the absorption tower (11);

the smoke collecting component comprises a collecting pool (51), a first valve (52) and a smoke analyzer (53) which are arranged on the discharge pipeline; the exhaust port (13) is communicated with the collecting tank (51) through the exhaust pipeline, and the flue gas analyzer (53) is used for monitoring the concentration of flue gas;

the desulfurizer circulating component comprises a circulating tank (41) and a circulating pump (42), the slurry tank (12) is communicated with the circulating tank (41) through the circulating pump (42), and the circulating pump (42) enables the solution in the slurry tank (12) to circularly flow in the slurry tank (12) and the circulating tank (41).

2. The flue gas desulfurization experimental simulation device of claim 1, further comprising a desulfurized gypsum discharge part, wherein the desulfurized gypsum discharge part comprises a discharge pipeline, a desulfurized gypsum storage bin (31) and a discharge valve (32) arranged on the discharge pipeline, one end of the discharge pipeline is communicated with the cavity wall of the slurry tank (12), and the other end of the discharge pipeline is communicated with the desulfurized gypsum storage bin (31).

3. The flue gas desulfurization experimental simulation device of claim 1, wherein the desulfurizer circulating means further comprises a ph tester (43) and a densitometer (44); the pH value tester (43) is arranged in the circulating pool (41) to monitor the pH value of the solution in the circulating pool (41) in real time; the specific gravity meter (44) is arranged in the circulating pool (41) to monitor the specific gravity of the solution in the circulating pool (41) in real time.

4. The flue gas desulfurization experimental simulation device of claim 3, wherein a spray valve (17) is arranged on the conveying pipeline, and when the specific gravity meter (44) monitors that the specific gravity of the solution is greater than or equal to a first set threshold value, the spray valve (17) is closed and a discharge valve (32) is opened.

5. The flue gas desulfurization experimental simulation apparatus of claim 1, wherein the flue gas collection unit further comprises a flue gas circulation line and a second valve (54) disposed on the flue gas circulation line; one end of the flue gas circulating pipeline is communicated with the discharge pipeline, and the other end of the flue gas circulating pipeline is communicated with the flue gas conveying pipeline; when the concentration of the smoke monitored by the smoke analyzer (53) is greater than or equal to a second set threshold value, the first valve (52) is closed and the second valve (54) is opened.

6. The flue gas desulfurization experimental simulation apparatus according to any one of claims 1 to 4, wherein the flue gas absorption unit further comprises a gas supply unit (16), and the gas supply unit (16) is communicated with the bottom of the slurry tank (12) to supply gas into the slurry tank (12).

7. The flue gas desulfurization experimental simulation apparatus of any one of claims 1 to 4, wherein said simulated flue gas component further comprises a heating assembly (22), said heating assembly (22) being disposed on said flue gas transportation pipeline for heating sulfur dioxide gas.

8. The flue gas desulfurization experimental simulation device according to any one of claims 1 to 4, wherein the spraying mechanism (14) comprises a plurality of nozzles, and the plurality of nozzles are distributed at intervals along the height direction of the absorption tower (11).