Automatic control system for SO2 reduction and selenium removal

Abstract

The utility model relates to an automatic control system for SO2 reduction and selenium removal, and belongs to the field of selenium extraction. Comprising an SO2 gas storage bottle, a selenium reduction barrel, a selenium solution heating tank and a controller, the SO2 gas storage bottle is connected with the selenium reduction barrel, and a first stop valve, a flow meter and a regulating valve are arranged on a corresponding pipeline; the selenium reduction barrel is connected with the absorption tower, a first SO2 concentration detector is arranged on a corresponding pipeline, and the absorption tower is connected with the gas inlet end of the desulfurization washer; the selenium solution heating tank is connected with external high-temperature steam supply equipment, a second stop valve is arranged on a corresponding pipeline, and a temperature sensor is arranged on the selenium solution heating tank; the selenium solution heating tank is connected with the selenium reduction barrel through a pump; a stirring mechanism and a liquid level meter are arranged in the selenium reduction barrel; the automatic introduction control of the selenium-containing solution of the sulfur dioxide gas machine is realized, and the control is accurate.

Description

TECHNICAL FIELD

[0001] The utility model relates to selenium extraction technical field especially relates to a SO2 reduction deselenization automation control system. BACKGROUND

[0002] Selenium is one of the scattered metals, which is widely used in metallurgy, glass, ceramics, electronics, solar energy, feed and other fields.

[0003] Selenium-containing industrial wastewater mainly comes from the production of selenium and the application of selenium industries, such as smelting selenium-containing metal ore, oil refining, thermal power generation, manufacturing sulfuric acid, pigments and special glass industries.

[0004] The traditional selenium-containing waste liquid treatment method has the problems of low efficiency and insufficient control precision, and still relies on traditional means in stirring, feeding and reaction monitoring, lacks intelligent and remote control characteristics. UTILITY MODEL CONTENT

[0005] In order to solve or partially solve the problems in the related art, the utility model provides a SO2 reduction deselenization automation control system, which aims to improve the intelligence of the SO2 reduction deselenization system.

[0006] Therefore, the application provides a SO2 reduction deselenization automation control system, which comprises a SO2 gas cylinder, a selenium reduction barrel, a selenium solution heating tank and a controller.

[0007] The gas outlet end of the SO2 gas cylinder is connected with the selenium reduction barrel through a gas inlet pipe, and a first shut-off valve, a flow meter and an adjusting valve are arranged on the gas inlet pipe; the selenium reduction barrel is connected with the gas inlet end of the absorption tower through a gas outlet pipe, and a first SO2 concentration detector is arranged on the gas outlet pipe; and the gas outlet end of the absorption tower is connected with the gas inlet end of the desulfurization scrubber through a pipeline.

[0008] The selenium solution heating tank is connected with an external high-temperature steam supply device through a steam inlet pipe, and a second shut-off valve is arranged on the steam inlet pipe; a temperature sensor for detecting the internal temperature of the selenium solution heating tank is arranged on the selenium solution heating tank; the liquid outlet pipe of the selenium solution heating tank is connected with the liquid inlet end of a pump through a pipeline, and the liquid outlet end of the pump is connected with the selenium reduction barrel through a pipeline.

[0009] A stirring mechanism and a liquid level meter for detecting the liquid level in the selenium reduction barrel are arranged in the selenium reduction barrel.

[0010] The first SO2 concentration detector, the flow meter and the temperature sensor and the liquid level meter are respectively connected with the signal input end of the controller, and the signal output end of the controller is respectively electrically connected with the first shut-off valve, the adjusting valve, the second shut-off valve and the pump.

[0011] In some schemes, the bottom of the SO2 gas cylinder is provided with a weighing sensor connected to the signal input end of the controller.

[0012] In some schemes, the exhaust end of the desulfurization scrubber is connected to a chimney through a smoke exhaust pipe provided with a second SO2 concentration detector connected to the signal input end of the controller, and the signal input end of the controller signal is connected to an alarm.

[0013] In some schemes, the sidewall bottom of the selenium reduction barrel is provided with air inlet holes spaced around the circumference thereof, and the air inlet holes are respectively connected to the liquid outlet ends of the pumps.

[0014] In some schemes, the stirring mechanism comprises a stirring shaft, a stirring motor, upper layer stirring blades and lower layer stirring blades; the stirring shaft is rotatably installed in the selenium reduction barrel, the upper end of the stirring shaft is connected to the output shaft of the stirring motor installed on the selenium reduction barrel, the lower end of the stirring shaft is provided with the lower layer stirring blades, and the middle part of the stirring shaft is provided with the upper layer stirring blades.

[0015] In some schemes, the length of the upper layer stirring blades is equal to half of the length of the lower layer stirring blades, the upper layer stirring blades are inclined to the horizontal plane from the root to the end, and the root to the middle part of the lower layer stirring blades are horizontally arranged, and the middle part to the end of the lower layer stirring blades are inclined to the horizontal plane.

[0016] The technical scheme provided by the utility model can have the following beneficial effects:

[0017] The application realizes the automatic introduction control of the sulfur dioxide gas machine containing selenium solution, has high control precision, realizes the full reaction of sulfur dioxide and the selenium-containing solution, reduces the labor intensity and the operation danger of the operator, improves the utilization rate of sulfur dioxide, reduces the waste of sulfur dioxide gas raw materials and the entry of sulfur dioxide into flue gas, and has a positive effect.

[0018] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and other objects, features and advantages of the utility model will become more apparent from the following detailed description of exemplary embodiments of the utility model, taken in conjunction with the accompanying drawings in which, in the utility model exemplary embodiments, the same reference numerals usually represent the same components.

[0020] Figure 1 is the schematic diagram of the pipeline of the control system shown in the utility model embodiments;

[0021] Figure 2is a control block diagram of the control system shown in the embodiments of the utility model;

[0022] Figure 3 is a stirring mechanism structure schematic view of the control system shown in the embodiments of the utility model;

[0023] Reference signs:

[0024] 1, SO2 gas cylinder; 2, selenium reduction barrel; 3, selenium solution heating groove; 4, controller; 5, inlet pipe; 6, first cut-off valve; 7, regulating valve; 8, flowmeter; 9, outlet pipe; 10, absorption tower; 11, first SO2 concentration detector; 12, desulfurization scrubber; 13, steam introduction pipe; 14, second cut-off valve; 15, temperature sensor; 16, pump; 17, stirring mechanism; 1701, stirring shaft; 1702, stirring motor; 1703, upper layer stirring blade; 1704, lower layer stirring blade; 18, liquid level meter; 19, weighing sensor; 20, second SO2 concentration detector. DETAILED DESCRIPTION

[0025] The embodiments of the utility model will be described in more detail below with reference to the drawings. Although the embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the utility model more thorough and complete, and to fully convey the scope of the utility model to those skilled in the art.

[0026] It should be understood that although the terms "first", "second", "third" and the like can be used to describe various information in the utility model, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the utility model. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0027] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the utility model.

[0028] Unless otherwise clearly indicated, the terms "mounting", "connecting", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according of the specific circumstances.

[0029] Please refer to Figure 1 And Figure 2 The application provides a SO2 reduction selenium removal automatic control system, including SO2 gas cylinder 1, selenium reduction bucket 2, selenium solution heating groove 3, controller 4.

[0030] The gas outlet end of the SO2 gas cylinder 1 is connected with the bottom of the selenium reduction bucket 2 through the gas inlet pipe 5, the first cut-off valve 6, the flow meter 8 and the adjusting valve 7 are arranged on the gas inlet pipe 5, the first cut-off valve 6 is used to control the on-off of the gas inlet pipe 5, and the adjusting valve 7 is used to control the flow of the SO2 introduced into the selenium reduction bucket 2; the selenium reduction bucket 2 is connected with the gas inlet end of the absorption tower 10 through the gas outlet pipe 9, specifically, the gas outlet pipe 9 is connected with the top of the selenium reduction bucket 2, the first SO2 concentration detector 11 is arranged on the gas outlet pipe 9, the first SO2 concentration detector 11 is used to detect the SO2 content of the gas led out from the selenium reduction bucket 2, and the gas outlet end of the absorption tower 10 is connected with the gas inlet end of the desulfurization scrubber 12 through a pipeline, and the absorption tower 10 and the desulfurization scrubber 12 are all used to absorb the residual SO2 in the gas led out from the selenium reduction bucket 2, so as to avoid the leakage of SO2 to the outside.

[0031] The selenium solution heating groove 3 is connected with an external high-temperature steam supply device through the steam inlet pipe 13, and the external high-temperature steam supply device is generally a boiler, the second cut-off valve 14 is arranged on the steam inlet pipe 13, the second cut-off valve 14 is used to control the on-off of the steam inlet pipe 13, and the temperature sensor 15 for detecting the temperature in the selenium solution heating groove 3 is arranged on the selenium solution heating groove 3; the liquid outlet pipe of the selenium solution heating groove 3 is connected with the liquid inlet end of the pump 16 through a pipeline, the liquid outlet end of the pump 16 is connected with the selenium reduction bucket 2 through a pipeline, and the pump 16 is used to convey the selenium solution in the selenium solution heating groove 3 to the selenium reduction bucket 2.

[0032] The selenium reduction bucket 2 is internally provided with the stirring mechanism 17 for stirring the materials in the selenium reduction bucket 2 and the liquid level meter 18 for detecting the liquid level height in the selenium reduction bucket 2; the first SO2 concentration detector 11, the flow meter 8 and the temperature sensor 15 and the liquid level meter 18 are respectively connected with the signal input end of the controller 4, and the signal output end of the controller 4 is respectively electrically connected with the first cut-off valve 6, the adjusting valve 7, the second cut-off valve 14 and the pump 16.

[0033] System use process:

[0034] SO2 gas is provided by SO2 gas cylinder 1, and the SO2 gas is introduced into selenium reduction barrel 2 through gas inlet pipe 5; selenium solution is provided by selenium solution heating tank 3, and the selenium solution is introduced into selenium reduction barrel 2 through the introduction pipe.

[0035] In the selenium reduction barrel 2, the SO2 gas reacts with the selenium solution to reduce the selenium, and the SO2 gas that does not participate in the reaction is introduced into the absorption tower 10 through the gas outlet pipe 9 for the first absorption, and the remaining SO2 gas is introduced into the desulfurization scrubber 12 through the pipeline for the second absorption, so as to ensure that the remaining SO2 gas can be completely absorbed, thereby avoiding the environmental pollution problem caused by the leakage of SO2 gas.

[0036] In this process, the SO2 concentration in the gas discharged from the selenium reduction barrel 2 is detected by the first SO2 concentration detector 11, and the relevant data is transmitted to the controller 4, and the controller 4 controls the opening of the regulating valve 7 according to the input signal, thereby adjusting the flow of SO2 introduced into the selenium reduction barrel 2, and at the same time, the opening of the regulating valve 7 is accurately adjusted by comparing with the actual flow detected by the flow meter 8, to realize the automatic introduction of SO2 gas, and to ensure the accurate control of the SO2 gas introduced into the selenium reduction barrel 2. When an emergency occurs, such as when the first SO2 concentration detector 11 detects that the SO2 concentration in the gas discharged from the selenium reduction barrel 2 exceeds the upper limit of the set standard, the controller 4 controls the first cut-off valve 6 to be directly closed, so as to avoid the continuous diffusion of SO2.

[0037] The liquid level in the selenium reduction barrel 2 is detected by the liquid level meter 18, and the relevant data is transmitted to the controller 4, and the controller 4 controls the start and stop of the pump 16 according to the input signal, thereby controlling the amount of selenium solution introduced into the selenium reduction barrel 2, and realizing the automatic introduction of the selenium solution, and at the same time, avoiding the overflow of the selenium solution.

[0038] High-temperature steam is introduced into the selenium solution heating tank 3 to increase the temperature of the selenium solution, so as to increase the speed of selenium reduction; at the same time, the temperature sensor 15 detects the temperature of the selenium solution in the selenium solution heating tank 3, and the relevant data is transmitted to the controller 4, and the controller 4 controls the on-off of the second cut-off valve 14 according to the input signal, so as to maintain the stability of the temperature of the selenium solution in the selenium solution heating tank 3.

[0039] The SO2 gas and the selenium solution in the selenium reduction barrel 2 are stirred by the stirring mechanism 17 to improve the uniformity of the two, thereby improving the reaction speed of the two.

[0040] In some embodiments, the bottom of the SO2 gas cylinder 1 is provided with a weighing sensor 19 connected to the signal input end of the controller 4. In operation, the weighing sensor 19 detects the weight of the SO2 gas cylinder 1 and transmits relevant data to the controller 4. The controller 4 obtains the output flow of SO2 according to the relationship between the weight loss of the SO2 gas cylinder 1 and time within a period of time, and verifies whether the addition amount of SO2 in the selenium reduction barrel 2 is accurate by comparing the flow with the data detected by the flow meter 8.

[0041] In some embodiments, the exhaust end of the desulfurization scrubber 12 is connected to a chimney through an exhaust pipe, and the exhaust pipe is provided with a second SO2 concentration detector 20 connected to the signal input end of the controller 4. The signal input end of the controller 4 is connected to an alarm. The second SO2 concentration detector 20 detects the SO2 concentration in the gas discharged from the desulfurization scrubber 12 and transmits relevant data to the controller 4. When the SO2 concentration exceeds the set concentration, the controller 4 controls the alarm to issue an alarm signal to remind the staff to maintain the system in time.

[0042] In some embodiments, the side wall of the selenium reduction barrel 2 is provided with air inlet holes spaced apart around the circumference thereof at the bottom. The air inlet holes are respectively connected to the liquid outlet ends of the pumps 16. In this way, SO2 gas is introduced into the selenium reduction barrel 2 through multiple points to improve the mixing uniformity of SO2 gas and selenium solution, thereby improving the reaction speed of the two.

[0043] In some embodiments, the stirring mechanism 17 includes a stirring shaft 1701, a stirring motor 1702, upper stirring blades 1703, and lower stirring blades 1704. The stirring shaft 1701 is rotatably installed in the selenium reduction barrel 2. The upper end of the stirring shaft 1701 is connected to the output shaft of the stirring motor 1702 installed on the selenium reduction barrel 2. The lower end of the stirring shaft 1701 is provided with the lower stirring blades 1704. The middle part of the stirring shaft 1701 is provided with the upper stirring blades 1703. In operation, the stirring motor 1702 drives the upper stirring blades 1703 and the lower stirring blades 1704 to rotate in the selenium reduction barrel 2 through the stirring shaft 1701, thereby realizing the mixing and stirring of SO2 gas and selenium solution.

[0044] In this embodiment, as shown in Figure 3As shown, the length of the upper stirring blade 1703 is equal to half of the length of the lower stirring blade 1704, and the upper stirring blade 1703 is arranged to be inclined to the horizontal plane from the root to the end; the root to the middle of the lower stirring blade 1704 is arranged to be horizontal, and the middle to the end is arranged to be inclined to the horizontal plane; in this way, when stirring, the lower stirring blade 1704 pushes the selenium solution at the inner edge of the selenium reduction barrel 2 downward, and after the selenium solution contacts the bottom of the selenium reduction barrel 2, the selenium solution moves to the middle of the selenium reduction barrel 2, and this part of the selenium solution is recorded as solution A; the upper stirring blade 1703 pushes the solution at the middle of the selenium reduction barrel 2 downward, and this part of the selenium solution is recorded as solution B, and solution A and solution B collide in the selenium reduction barrel 2, thereby effectively improving the stirring capacity of the stirring mechanism 17.

[0045] The above has described the embodiments of the present application, and the above description is exemplary, is not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other ordinary skilled persons in the art to understand the disclosed embodiments.

Claims

1. A SO2 reduction deselenium automatic control system, characterized in that: It comprises SO2 gas cylinder (1), selenium reduction barrel (2), selenium solution heating tank (3), controller (4); The gas outlet of the SO2 gas cylinder (1) is connected with the selenium reduction barrel (2) through the gas inlet pipe (5), and the gas inlet pipe (5) is provided with a first cut-off valve (6), an adjusting valve (7) and a flowmeter (8); the selenium reduction barrel (2) is connected with the gas inlet end of the absorption tower (10) through the gas outlet pipe (9), and the gas outlet pipe (9) is provided with a first SO2 concentration detector (11); the gas outlet end of the absorption tower (10) is connected with the gas inlet end of the desulfurization scrubber (12) through a pipeline; The selenium solution heating tank (3) is connected with external high-temperature steam supply equipment through the steam inlet pipe (13), and the steam inlet pipe (13) is provided with a second cut-off valve (14); the selenium solution heating tank (3) is provided with a temperature sensor (15) for detecting the temperature inside the tank; the liquid outlet pipe of the selenium solution heating tank (3) is connected with the liquid inlet end of the pump (16) through a pipeline, and the liquid outlet end of the pump (16) is connected with the selenium reduction barrel (2) through a pipeline; The selenium reduction barrel (2) is provided with a stirring mechanism (17) and a liquid level meter (18) for detecting the liquid level in the selenium reduction barrel (2); The first SO2 concentration detector (11), the flowmeter (8), the temperature sensor (15) and the liquid level meter (18) are respectively connected with the signal input end of the controller (4), and the signal output end of the controller (4) is respectively electrically connected with the first cut-off valve (6), the adjusting valve (7), the second cut-off valve (14) and the pump (16).

2. The SO2 reduction and deselenium automatic control system according to claim 1, wherein: The bottom of the SO2 gas cylinder (1) is provided with a weighing sensor (19), and the weighing sensor (19) is connected with the signal input end of the controller (4).

3. The SO2 reduction and deselenium automatic control system according to claim 1, wherein: The gas outlet end of the desulfurization scrubber (12) is connected with a chimney through a smoke exhaust pipe, and the smoke exhaust pipe is provided with a second SO2 concentration detector (20); the second SO2 concentration detector (20) is connected with the signal input end of the controller (4), and the signal input end of the controller (4) is connected with an alarm.

4. The SO2 reduction and deselenium automatic control system according to claim 1, wherein: The side wall of the selenium reduction barrel (2) is provided with gas inlet holes at the bottom and spaced apart along the circumferential direction, and the gas inlet holes are respectively connected with the liquid outlet end of the pump (16).

5. The SO2 reduction and deselenium automatic control system according to claim 1, wherein: The stirring mechanism (17) comprises a stirring shaft (1701), a stirring motor (1702), upper layer stirring blades (1703), and lower layer stirring blades (1704); the stirring shaft (1701) is rotatably installed in the selenium reduction barrel (2), the upper end of the stirring shaft (1701) is connected with the output shaft of the stirring motor (1702) installed on the selenium reduction barrel (2), the lower end of the stirring shaft (1701) is provided with the lower layer stirring blades (1704), and the middle part of the stirring shaft (1701) is provided with the upper layer stirring blades (1703).

6. The SO2 reduction and selenium removal automatic control system according to claim 5, characterized in that: The length of the upper layer stirring blades (1703) is equal to half of the length of the lower layer stirring blades (1704), the upper layer stirring blades (1703) are inclined to the horizontal plane from the root to the end, and the root to the middle of the lower layer stirring blades (1704) are horizontally arranged, and the middle to the end of the lower layer stirring blades (1704) are inclined to the horizontal plane.

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