A slaked lime auxiliary discharging device for dry desulfurization

Abstract

The utility model discloses a kind of for dry desulfurization's slaked lime auxiliary unloading device, it is related to industrial waste gas desulfurization technical field, including the deacidification tower venturi section of inside for negative pressure state, the diffusion section outer wall of deacidification tower venturi section is connected with the unloading chute pipe of obliquely arranged, the surface of unloading chute pipe is connected with the injection pipe for conveying gas to unloading chute pipe, injection pipe is provided with the injection solenoid valve for conducting or closing injection pipe, and the one end of unloading chute pipe away from deacidification tower venturi section is connected with unloading straight pipe.The utility model is through multi-dimension auxiliary unloading design, can ensure that slaked lime enters deacidification tower with more uniform state, increase its reaction contact area with SO2 in flue gas, not only can realize more efficient SO2 removal under the premise of reducing slaked lime addition amount, save slaked lime consumption, but also can completely avoid the blockage problem of slaked lime in unloading chute pipe, substantially reduce equipment cleaning blockage maintenance frequency and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of industrial waste gas desulfurization technology, specifically to a lime-assisted feeding device for dry desulfurization. Background Technology

[0002] During the production processes of industrial kilns, coal-fired boilers, biomass boilers, and waste incineration power plants, a large amount of SO2-containing waste gas is generated. SO2 is one of the main pollutants causing acid rain, air pollution, and smog, therefore, desulfurization treatment of SO2-containing waste gas is necessary. Currently, the dry desulfurization process using slaked lime is widely used in waste gas desulfurization due to its simple process, low operating cost, and the ability to recycle byproducts. Its core lies in ensuring desulfurization efficiency while taking into account both economy and practicality through appropriate slaked lime conveying and addition methods.

[0003] Currently, in existing dry desulfurization systems, there are two main modes for the conveying and addition of hydrated lime, but both have obvious drawbacks: Pneumatic conveying mode: Hydrated lime enters the Venturi ejector through the discharge valve, mixes with the hot air flow formed by the air source provided by the Roots blower, and is then sprayed into the deacidification tower through the conveying pipeline. However, because hydrated lime is a fine powder material with a large specific surface area and strong hygroscopicity, it is highly susceptible to moisture absorption and caking during storage and transportation. Furthermore, its small particle size and poor flowability also make it prone to bridging and blockage, affecting the normal descent and continuous conveying of the material. Even with an electric heating device installed at the rear of the Roots blower to reduce air humidity and increase gas temperature, this only mitigates the risk of moisture absorption by the hydrated lime to a certain extent. This measure cannot solve the problem of the incoming material already being moisture-absorbing and caking. Moreover, once hydrated lime caking and accumulating in the conveying pipeline or at bends in the silo, it easily causes blockages in areas with high local resistance such as bends, tees, and valves in the pneumatic conveying system, affecting the stability and continuity of system operation, increasing the frequency of unblocking and maintenance, and reducing equipment reliability.

[0004] Gravity-feed conveying mode: slaked lime is fed into the feed chute via a screw conveyor, and the negative pressure inside the desulfurization tower causes the slaked lime to fall into the reaction zone of the tower by gravity along the inclined chute. However, during the screw conveying process, the material is easily affected by compression, friction, or accumulation, resulting in uneven feeding. Consequently, the slaked lime fails to maintain a good loose state and is prone to clumping and forming lumps. Furthermore, the lumps of slaked lime are difficult to disperse evenly in the tower, resulting in insufficient contact with acidic components in the flue gas. This not only reduces desulfurization efficiency but also increases the amount of lime added, causing material waste. At the same time, when the lumps of slaked lime pass through the feed chute, they are also prone to adhering to the chute wall and accumulating to form a caking layer, hindering the subsequent material from falling, increasing the risk of blockage, and affecting the long-term stable operation of the system. Utility Model Content

[0005] The purpose of this invention is to provide a lime-assisted feeding device for dry desulfurization, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A quicklime auxiliary feeding device for dry desulfurization includes a venturi section of a desulfurization tower with an internal negative pressure state. The outer wall of the diffusion section of the venturi section is connected to an inclined feeding chute. A blowpipe for conveying gas into the feeding chute is connected to the surface of the feeding chute. A blowpipe solenoid valve for opening or closing the blowpipe is provided on the blowpipe. The end of the feeding chute away from the venturi section of the desulfurization tower is connected to a straight feeding pipe for inputting quicklime. A vibration component is provided on the outer wall of the feeding chute below the straight feeding pipe.

[0007] Preferably, the vibration assembly includes a pneumatic vibrator installed on the outer wall of the feed chute and a vibrator control solenoid valve for controlling the pneumatic vibrator to operate at regular intervals.

[0008] Preferably, the end of the feed chute away from the Venturi section of the deacidification tower is provided with an end cap, and the end cap has several small holes.

[0009] Preferably, the jet pipe includes a first pipe section connected to one end of the discharge chute, and a second pipe section and a third pipe section connected to the outer wall of the discharge chute. The jet solenoid valve is disposed on the first pipe section, and one end of the second pipe section is connected to the first pipe section, and one end of the third pipe section is connected to the second pipe section.

[0010] Preferably, the end of the second pipe section connected to the discharge chute is located at 1 / 3 of the length of the discharge chute.

[0011] Preferably, the end of the third pipe section connected to the discharge chute is located at 2 / 3 of the length of the discharge chute.

[0012] Preferably, the end of the straight discharge pipe away from the discharge chute is connected to a screw conveyor for conveying quicklime.

[0013] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows: In this invention, the design of small holes on the end cap allows external air to be drawn into the feed chute through the small holes on the end cap, which is beneficial for the initial purging of the slaked lime that has just entered the feed chute, preventing the slaked lime from accumulating at the feed chute inlet, and also assisting the slaked lime in moving towards the deacidification tower.

[0014] In this invention, the timed opening of the solenoid valve allows compressed air to be simultaneously sprayed into the feed chute through three spray points on the spray pipe. This causes the spray point at the end cap to break up any small clumps that may form near the feed chute inlet due to initial accumulation. The spray points at 1 / 3 and 2 / 3 of the length act on the slaked lime in the middle and tail of the feed chute, respectively, to prevent the slaked lime from clumping due to friction and compression during its descent. This also further promotes the slaked lime to slide down.

[0015] In this invention, the timing of the opening of the solenoid valve controlled by the vibrator allows the pneumatic vibrator to drive the feed chute to vibrate. This causes the vibration force to be transmitted through the feed chute wall to the inner wall, causing the quicklime adhering to the inner wall to fall off. This prevents the quicklime from forming a hardened layer due to long-term adhesion, ensuring the smoothness of the inner wall of the feed chute and facilitating the subsequent sliding of quicklime.

[0016] In this invention, slaked lime can fall smoothly down the feed chute and enter the desulfurization tower under the combined action of its own gravity, the blowing force of the airflow drawn in from the outside, and the compressed air flow ejected from the blowpipe. This effectively ensures that the slaked lime enters the Venturi section of the desulfurization tower in a loose state, increasing its reaction contact area with SO2 in the flue gas. This not only achieves more efficient SO2 removal with a reduced amount of slaked lime, saving slaked lime consumption, but also completely avoids the problem of slaked lime clogging in the feed chute, significantly reducing the frequency and cost of equipment cleaning and maintenance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] In the diagram: 1. Screw conveyor; 2. Feed chute; 3. Pneumatic solenoid valve; 4. Pneumatic vibrator; 5. Vibrator control solenoid valve; 6. Pneumatic pipe; 61. First pipe section; 62. Second pipe section; 63. Third pipe section; 7. Venturi section of deacidification tower; 8. Feed straight pipe. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to embodiments: like Figure 1As shown, this utility model provides an auxiliary feeding device for slaked lime in dry desulfurization, including a Venturi section 7 of a desulfurization tower with a negative pressure environment inside. The negative pressure environment inside the Venturi section 7 is used to provide auxiliary power for the falling slaked lime. The outer wall of the diffusion section of the Venturi section 7 is connected to an inclined feeding chute 2. The inclined feeding chute 2 is designed to adapt to the gravity falling trajectory of the slaked lime and ensure smooth feeding. A blowpipe 6 for conveying gas into the feeding chute 2 is connected to the surface of the feeding chute 2. A blowpipe solenoid valve 3 is provided on the blowpipe 6 for opening or closing the blowpipe 6. The end of the feeding chute 2 away from the Venturi section 7 of the desulfurization tower is connected to a straight feeding pipe 8 for inputting slaked lime. A vibration component is provided on the outer wall of the feeding chute 2 below the straight feeding pipe 8.

[0020] Among them, the end of the straight discharge pipe 8 away from the discharge chute 2 is connected to a screw conveyor 1 for conveying quicklime. The screw conveyor 1 adopts existing conventional equipment, which is widely used in the field, such as in the gravity dropping conveying mode; and the screw conveyor 1 is used to quantitatively convey quicklime into the discharge chute 2 through the straight discharge pipe 8.

[0021] The end of the feed chute 2 away from the Venturi section 7 of the deacidification tower is provided with an end cap, and the end cap has several small holes. Through the opening of several small holes on the end cap, under the negative pressure inside the Venturi section 7 of the deacidification tower, external air can be drawn into the feed chute 2 through the small holes to form an airflow purging effect, to initially disperse the slaked lime and prevent the material from accumulating at the inlet of the feed chute 2.

[0022] Furthermore, the vibration assembly includes a pneumatic vibrator 4 installed on the outer wall of the feed chute 2 and a vibrator control solenoid valve 5 for controlling the timed operation of the pneumatic vibrator 4. The pneumatic vibrator 4 and the vibrator control solenoid valve 5 are electrically connected. By setting the timed opening frequency and duration of the vibrator control solenoid valve 5, the pneumatic vibrator 4 can be driven to vibrate the inlet of the feed chute 2 at regular intervals, causing the quicklime adhering to the inner wall of the feed chute 2 to fall off and enter the interior of the blowpipe 6. This avoids the quicklime adhering to the inner wall of the feed chute 2 for a long time and forming a hardened layer, ensuring the smoothness of the inner wall of the feed chute 2 and facilitating the falling of materials.

[0023] It should be noted that this solution aims to protect the physical structure, not the circuitry and program control. The mention of the processing circuitry and program control in this paper is merely a supplementary explanation of the feasibility and authenticity of this utility model, and this utility model does not seek protection for the circuitry and program control technology. Furthermore, the Venturi section 7 of the deacidification tower mentioned in this utility model directly adopts a part of the industrial flue gas treatment system, which is already a publicly known technology in the field. This paper will not elaborate on it in detail, and although it will not be elaborated on in detail, those skilled in the art will be able to understand and apply it based on their professional knowledge.

[0024] Furthermore, the blow pipe 6 includes a first pipe section 61 connected to one end of the discharge chute 2, and a second pipe section 62 and a third pipe section 63 connected to the outer wall of the discharge chute 2. The blow solenoid valve 3 is disposed on the first pipe section 61, and one end of the second pipe section 62 is connected to the first pipe section 61, and one end of the third pipe section 63 is connected to the second pipe section 62. One end of the first pipe section 61 is connected to the end cap on the discharge chute 2, the end of the second pipe section 62 connected to the discharge chute 2 is located at 1 / 3 of the length of the discharge chute 2, and the end of the third pipe section 63 connected to the discharge chute 2 is located at 2 / 3 of the length of the discharge chute 2.

[0025] Specifically, this solution uses compressed air as the air source, and three distributed blowing points are set on the blowing pipe 6, located at the end cap of the discharge chute 2 and at two approximately third-order points along the length of the discharge chute 2. Furthermore, by timed opening of the blowing solenoid valve 3, compressed air can be sprayed out simultaneously from the three blowing points to achieve strong dispersion of the slaked lime at different locations in the discharge chute 2, ensuring that the slaked lime always remains loose and non-clumped, and avoiding local clumping.

[0026] The working principle of this lime-assisted feeding device for dry desulfurization will be explained in detail below.

[0027] like Figure 1 As shown, by starting the screw conveyor 1, the device can quantitatively and continuously transport the slaked lime in the silo to the discharge straight pipe 8 through the rotation of its internal screw blades. After passing through the discharge straight pipe 8, the slaked lime can naturally fall into the inclined discharge chute 2 and slide down the inside of the discharge chute 2 in an inclined direction under its own gravity. Subsequently, with the help of the negative pressure environment in the Venturi section 7 of the deacidification tower, external air can be drawn into the discharge chute 2 through the small holes on the end cap, forming an airflow along the length of the discharge chute 2. This facilitates the initial purging of the slaked lime that has just entered the discharge chute 2, on the one hand, preventing the slaked lime from accumulating at the inlet of the discharge chute 2, and on the other hand, assisting the slaked lime to move towards the deacidification tower.

[0028] Furthermore, during the feeding of slaked lime, the timed opening of the solenoid valve 3 allows compressed air to be simultaneously sprayed into the chute 2 through three spray points on the spray pipe 6. The spray point at the end cap targets small clumps that may initially form near the inlet of the chute 2 due to accumulation, providing initial dispersion. The spray points at 1 / 3 and 2 / 3 of the chute act on the slaked lime in the middle and tail of the chute 2 respectively, preventing clumping due to friction and compression during the descent, and further promoting its downward movement. The timed opening of the solenoid valve 5, controlled by the vibrator, drives the pneumatic vibrator 4 to vibrate the chute 2, transmitting the vibration force through the chute wall to the inner wall, causing the slaked lime adhering to the inner wall to detach, preventing long-term adhesion and the formation of a hardened layer, ensuring the smoothness of the inner wall of the chute 2, and facilitating subsequent descent of the slaked lime.

[0029] In summary, under the combined action of its own gravity, the purging force of the airflow drawn in from the outside, and the compressed air flow ejected from the blowpipe 6, the slaked lime falls smoothly along the feed chute 2 and enters the desulfurization tower. This effectively ensures that the slaked lime enters the Venturi section 7 of the desulfurization tower in a loose and uniform state, thereby making full contact with the SO2-containing flue gas in the tower, laying the foundation for efficient desulfurization reaction.

[0030] Compared to the traditional pneumatic conveying mode (equipped with a 7.5kw Roots blower, a 20kw electric heater, and a 1.1kw unloader), this utility model adopts a gravity-feeding method, which eliminates the need for a Roots blower and high-power electric heating equipment, thereby significantly reducing system energy consumption and achieving better energy-saving effects.

[0031] Compared to the traditional gravity feeding method (with a power of approximately 3kW), this invention, through a multi-dimensional auxiliary feeding design, ensures that the quicklime enters the desulfurization tower in a more uniform state, increasing its reaction contact area with SO2 in the flue gas. This not only achieves more efficient SO2 removal while reducing the amount of quicklime added, saving quicklime consumption, but also completely avoids the problem of quicklime clogging in the feeding chute 2, significantly reducing the frequency and cost of equipment cleaning and maintenance.

[0032] It is worth noting that this solution aims to protect the physical structure, but does not protect the circuitry and program control. The mention of the processing circuitry and program control in this paper is merely a supplementary explanation of the feasibility and authenticity of this utility model, and this utility model does not seek protection for the circuitry and program control technology. Furthermore, the Venturi section 7 of the deacidification tower mentioned in this utility model is a part of the industrial flue gas treatment system, which is already a publicly known technology in the field. This paper will not elaborate on it, and although it will not elaborate on it in detail, those skilled in the art will be able to understand and apply it based on their professional knowledge.

[0033] It should be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0034] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A quicklime auxiliary feeding device for dry desulfurization, comprising a Venturi section of a desulfurization tower under negative pressure, characterized in that: The outer wall of the diffusion section of the Venturi section of the deacidification tower is connected to an inclined feed chute. The surface of the feed chute is connected to a jet pipe for conveying gas into the feed chute. The jet pipe is equipped with a jet solenoid valve for opening or closing the jet pipe. The end of the feed chute away from the Venturi section of the deacidification tower is connected to a straight feed pipe for inputting hydrated lime. A vibration component is installed on the outer wall of the feed chute located below the straight feed pipe.

2. The slaked lime auxiliary feeding device for dry desulfurization according to claim 1, characterized in that: The vibration assembly includes a pneumatic vibrator installed on the outer wall of the feed chute and a vibrator control solenoid valve for controlling the pneumatic vibrator to operate at regular intervals.

3. The lime-assisted feeding device for dry desulfurization according to claim 1, characterized in that: The end of the feed chute away from the Venturi section of the deacidification tower is provided with an end cap, and the end cap has several small holes.

4. The lime-assisted feeding device for dry desulfurization according to claim 1, characterized in that: The jet pipe includes a first pipe section connected to one end of the discharge chute, and a second and a third pipe section connected to the outer wall of the discharge chute. The jet solenoid valve is installed on the first pipe section, and one end of the second pipe section is connected to the first pipe section, and one end of the third pipe section is connected to the second pipe section.

5. A lime-assisted feeding device for dry desulfurization according to claim 4, characterized in that: The end of the second pipe section that connects to the discharge chute is located at 1 / 3 of the length of the discharge chute.

6. The lime-assisted feeding device for dry desulfurization according to claim 4, characterized in that: The third pipe section is connected to the discharge chute at one end, which is located at 2 / 3 of the length of the discharge chute.

7. The lime-assisted feeding device for dry desulfurization according to claim 1, characterized in that: The end of the straight discharge pipe furthest from the discharge chute is connected to a screw conveyor for conveying quicklime.

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