Denitration device for hydrochloric acid regeneration tail gas

Abstract

The utility model is applicable to the field of pollution control, and provides a denitration device for hydrochloric acid regeneration tail gas, which comprises a denitration component and a gas washing component, an alkaline solution is added into a gas washing tank through an arranged liquid outlet pipe, waste gas is introduced into the gas washing tank through a second gas inlet pipe, hydrogen chloride in the waste gas is removed through chemical reaction, and the hydrochloric acid regeneration tail gas is obtained. Meanwhile, part of oxynitride which is dissolved in water and can react with an alkaline solution can be removed, meanwhile, the phenomenon that a catalyst is poisoned by acid gas can be prevented, residual waste gas is discharged into the denitration tank through a second gas outlet pipe and a first gas inlet pipe for SCR denitration, the denitration tank is heated through a heating pipe to reach the reaction temperature, and the denitration effect is improved. And a reducing agent is sprayed into the denitration tank in cooperation with the spraying pipe, oxynitride in the waste gas is subjected to an oxidation-reduction reaction through a catalyst on the surface of the catalyst carrier, nitrogen is reduced into nitrogen, and denitration of the waste gas is completed.

Description

Technical Field

[0001] The utility model belongs to the field of pollution control, and in particular relates to a denitration device for hydrochloric acid regeneration tail gas. Background Art

[0002] Spent acid regeneration typically involves treating waste solutions containing multiple acids, most commonly mixtures of sulfuric acid and hydrofluoric acid. This process is complex and involves multiple chemical reactions and separation steps. Hydrochloric acid regeneration, on the other hand, primarily involves the recovery and reuse of hydrochloric acid wastewater.

[0003] Due to the volatility of hydrochloric acid, chemical treatment of spent acid typically generates heat, which causes the hydrochloric acid's active ingredient, hydrogen chloride, to volatilize and be discharged along with the regeneration waste gas generated by the chemical treatment. In addition to hydrogen chloride, this regeneration waste gas typically also contains nitrogen oxides. This exhaust gas typically requires treatment, but existing denitrification equipment is generally not equipped to remove hydrogen chloride, resulting in the presence of hydrogen chloride gas in the exhaust gas. Direct emission of this gas can pollute the atmosphere. Utility Model Content

[0004] The purpose of the embodiments of the present invention is to provide a denitration device for hydrochloric acid regeneration tail gas, aiming to solve the problems raised in the background technology.

[0005] The embodiment of the present utility model is realized as follows: a denitration device for hydrochloric acid regeneration tail gas, comprising a denitration component and a scrubbing component, wherein the denitration component comprises a denitration tank, a catalyst carrier, a nozzle and a heating pipe, one end of the denitration tank is fixedly provided with a first air inlet pipe, the other end of the denitration tank is fixedly provided with a first air outlet pipe, the catalyst carrier is fixedly installed in the denitration tank, a catalyst is attached to the surface of the catalyst carrier, the heating pipe is spirally wound around the outside of the denitration tank, both ends of the heating pipe are connected to connecting wires, the outside of the heating pipe is coated with an insulation layer, and the connecting wires penetrate the insulation layer. The heat-insulating layer extends to the outside, the nozzle is fixedly installed on the side of the denitrification tank, the upper end of the nozzle passes through the denitrification tank and the heat-insulating layer and extends to the outside, a connector is provided at the upper end of the nozzle, the scrubbing assembly includes a scrubbing tank and a second air inlet pipe, the second air inlet pipe is fixedly provided at the upper end of the scrubbing tank, the lower end of the second air inlet pipe extends into the scrubbing tank, the upper end of the scrubbing tank is also fixedly provided with a second air outlet pipe, the second air outlet pipe is connected to the first air inlet pipe, a liquid inlet pipe is fixedly provided on the side of the scrubbing tank, a liquid outlet pipe is also fixedly provided on the side of the scrubbing tank, and an alkaline solution is contained in the scrubbing tank.

[0006] As a further solution of the present invention: the catalyst carrier is configured as a loose porous structure.

[0007] As a further solution of the present invention: the liquid level of the solution in the scrubbing tank is higher than the lower end of the second air inlet pipe.

[0008] As a further solution of the present invention: a ventilation block is fixedly installed at the lower end of the second air inlet pipe, and the ventilation block is configured as a corrosion-resistant loose porous structure.

[0009] As a further solution of the present invention: a motor is fixedly installed in the middle of the upper end of the gas washing tank, and the main shaft of the motor passes through the upper end of the gas washing tank and is fixedly connected to the stirring rod.

[0010] As a further solution of the present invention: the stirring rod is configured as a rod-shaped structure made of corrosion-resistant material, and a stirring blade is fixedly provided at the lower end of the outer side of the stirring rod.

[0011] The beneficial effects of the present invention are:

[0012] The embodiment of the utility model provides a denitrification device for hydrochloric acid regeneration tail gas, which adds alkaline solution into the scrubbing tank through the provided liquid outlet pipe, and introduces exhaust gas into the scrubbing tank through the second air inlet pipe. The hydrogen chloride in the exhaust gas is removed by chemical reaction, and the nitrogen oxides that can react with the alkaline solution after being partially dissolved in water can also be removed. At the same time, the acidic gas can be prevented from poisoning the catalyst. The remaining exhaust gas is discharged into the denitrification tank through the second air outlet pipe and the first air inlet pipe for SCR denitrification. The denitrification tank is heated to the reaction temperature by the heating pipe, and a reducing agent is sprayed into the denitrification tank in conjunction with the nozzle. The nitrogen oxides in the exhaust gas are subjected to an oxidation-reduction reaction by the catalyst on the surface of the catalyst carrier, and the nitrogen is reduced to nitrogen gas, thereby completing the denitrification of the exhaust gas.

[0013] The embodiment of the present invention provides a denitration device for hydrochloric acid regeneration tail gas, which increases the surface area through a loose and porous catalyst carrier, thereby increasing the amount of catalyst adhesion, while also making the reaction more complete and improving the denitration efficiency.

[0014] The embodiment of the present utility model provides a denitrification device for hydrochloric acid regeneration tail gas, which reduces the gas outlet speed at the lower end of the scrubber through a loose and porous air permeable block, and disperses the waste gas into multiple small bubbles for discharge, so that the acidic gas in the waste gas fully reacts with the alkaline solution, thereby improving the removal efficiency.

[0015] The embodiment of the present invention provides a denitrification device for hydrochloric acid regeneration tail gas, which stirs the solution by means of stirring blades to improve the degree of reaction. At the same time, it can also ensure that the overall temperature of the solution is equal, preventing the local temperature of the solution from being too high and causing gas volatilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional structural diagram of a denitration device for hydrochloric acid regeneration tail gas provided in an embodiment of the utility model;

[0017] Figure 2A partial cross-sectional view of a denitration component 1 of a denitration device for hydrochloric acid regeneration of tail gas provided in an embodiment of the present utility model;

[0018] Figure 3 A partial cross-sectional view of a scrubbing assembly 2 of a denitration device for hydrochloric acid regeneration tail gas provided in an embodiment of the present utility model.

[0019] In the accompanying drawings: denitrification component 1, denitrification tank 11, first air inlet pipe 12, first air outlet pipe 13, catalyst carrier 14, nozzle 15, connector 151, heating tube 16, connecting wire 161, insulation layer 17, air washing component 2, air washing tank 21, second air inlet pipe 22, air permeable block 221, second air outlet pipe 23, liquid inlet pipe 24, liquid outlet pipe 25, motor 26, stirring rod 27, stirring blade 271. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0022] As shown in Figure 1 to Figure 3 As shown, a denitration device for hydrochloric acid regeneration tail gas provided by an embodiment of the present invention includes a denitration component 1 and a scrubbing component 2, the denitration component 1 includes a denitration tank 11, a catalyst carrier 14, a nozzle 15 and a heating pipe 16, one end of the denitration tank 11 is fixedly provided with a first air inlet pipe 12, the other end of the denitration tank 11 is fixedly provided with a first air outlet pipe 13, the catalyst carrier 14 is fixedly installed in the denitration tank 11, the surface of the catalyst carrier 14 is attached with a catalyst, the heating pipe 16 is spirally arranged on the outside of the denitration tank 11, both ends of the heating pipe 16 are connected to connecting wires 161, the outside of the heating pipe 16 is coated with an insulation layer 17, and the connecting wire 161 penetrates the insulation layer 17 and extends to the outside, the nozzle 15 is fixedly mounted on the side of the denitrification tank 11, the upper end of the nozzle 15 passes through the denitrification tank 11 and the insulation layer 17 and extends to the outside, the upper end of the nozzle 15 is provided with a connector 15l, the scrubbing assembly 2 includes a scrubbing tank 21 and a second air inlet pipe 22, the second air inlet pipe 22 is fixedly provided at the upper end of the scrubbing tank 21, the lower end of the second air inlet pipe 22 extends into the scrubbing tank 21, the upper end of the scrubbing tank 21 is also fixedly provided with a second air outlet pipe 23, the second air outlet pipe 23 is connected to the first air inlet pipe 12, the side of the scrubbing tank 21 is fixedly provided with a liquid inlet pipe 24, the side of the scrubbing tank 21 is also fixedly provided with a liquid outlet pipe 25, and the scrubbing tank 21 is filled with an alkaline solution.

[0023] In one embodiment of the present invention, an alkaline solution is added to the scrubbing tank 21 through the provided liquid outlet pipe 25, and exhaust gas is introduced into the scrubbing tank 21 through the second air inlet pipe 22. The hydrogen chloride in the exhaust gas is removed by chemical reaction, and the nitrogen oxides that can react with the alkaline solution after being partially dissolved in water can also be removed. At the same time, the acidic gas can be prevented from poisoning the catalyst. The remaining exhaust gas is discharged into the denitrification tank 11 through the second air outlet pipe 23 and the first air inlet pipe 12 for SCR denitrification. The denitrification tank 11 is heated to the reaction temperature by the heating tube 16, and a reducing agent is sprayed into the denitrification tank 11 in conjunction with the nozzle 15. The nitrogen oxides in the exhaust gas are subjected to an oxidation-reduction reaction by the catalyst on the surface of the catalyst carrier 14, and the nitrogen is reduced to nitrogen gas, thereby completing the denitrification of the exhaust gas.

[0024] like Figure 2 As shown, as another embodiment of the present invention, the catalyst carrier 14 is configured as a loose porous structure.

[0025] In one embodiment of the present invention, the surface area is increased by the loose and porous catalyst carrier 14, thereby increasing the amount of catalyst adhesion, while also making the reaction more complete and improving the denitrification efficiency.

[0026] like Figure 3 As shown in FIG. 2 , as another embodiment of the present invention, the liquid level of the solution in the scrubbing tank 21 is higher than the lower end of the second air inlet pipe 22 .

[0027] Specifically, a ventilation block 221 is fixedly installed at the lower end of the second air inlet pipe 22, and the ventilation block 221 is configured as a corrosion-resistant loose porous structure.

[0028] In one embodiment of the present invention, the loose and porous air permeable block 221 is used to reduce the gas outlet speed at the lower end of the scrubber tank 21, and the exhaust gas is dispersed into multiple small bubbles for discharge, so that the acidic gas in the exhaust gas reacts fully with the alkaline solution, thereby improving the removal efficiency.

[0029] like Figure 3 As shown, as another embodiment of the present invention, a motor 26 is fixedly installed in the middle of the upper end of the washing tank 21, and the main shaft of the motor 26 passes through the upper end of the washing tank 21 and is fixedly connected to the stirring rod 27.

[0030] Specifically, the stirring rod 27 is configured as a rod-shaped structure made of corrosion-resistant material, and a stirring blade 271 is fixedly provided at the lower end of the outer side of the stirring rod 27 .

[0031] In one embodiment of the present invention, the solution is stirred by the stirring blades 271 to improve the degree of reaction. At the same time, the overall temperature of the solution is kept constant to prevent the local temperature of the solution from being too high and causing gas volatilization.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations that come within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0035] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0036] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A denitration device for hydrochloric acid regeneration tail gas, comprising a denitration component (1) and a scrubbing component (2), characterized in that: The denitration component (1) comprises a denitration tank (11), a catalyst carrier (14), a nozzle (15) and a heating pipe (16); a first air inlet pipe (12) is fixedly provided at one end of the denitration tank (11); a first air outlet pipe (13) is fixedly provided at the other end of the denitration tank (11); the catalyst carrier (14) is fixedly installed in the denitration tank (11); a catalyst is attached to the surface of the catalyst carrier (14); the heating pipe (16) is spirally arranged on the outside of the denitration tank (11); connecting wires (161) are connected to both ends of the heating pipe (16); the outside of the heating pipe (16) is covered with a heat-insulating layer (17); the connecting wire (161) penetrates the heat-insulating layer (17) and extends to the outside; the nozzle (15) is fixedly installed in the denitration tank (11); 1) side, the upper end of the nozzle (15) penetrates the denitrification tank (11) and the insulation layer (17) and extends to the outside, the upper end of the nozzle (15) is provided with a connector (151), the scrubbing assembly (2) comprises a scrubbing tank (21) and a second air inlet pipe (22), the second air inlet pipe (22) is fixedly provided at the upper end of the scrubbing tank (21), the lower end of the second air inlet pipe (22) extends into the scrubbing tank (21), the upper end of the scrubbing tank (21) is also fixedly provided with a second air outlet pipe (23), the second air outlet pipe (23) is connected to the first air inlet pipe (12), the side of the scrubbing tank (21) is fixedly provided with a liquid inlet pipe (24), the side of the scrubbing tank (21) is also fixedly provided with a liquid outlet pipe (25), and the scrubbing tank (21) is filled with an alkaline solution.

2. A denitration device for hydrochloric acid regeneration tail gas according to claim 1, characterized in that: The catalyst carrier (14) is configured as a loose porous structure.

3. A denitration device for hydrochloric acid regeneration tail gas according to claim 1, characterized in that: The liquid level of the solution in the scrubbing tank (21) is higher than the lower end of the second air inlet pipe (22).

4. A denitration device for hydrochloric acid regeneration tail gas according to claim 3, characterized in that: A ventilation block (221) is fixedly mounted on the lower end of the second air inlet pipe (22), and the ventilation block (221) is configured as a corrosion-resistant loose porous structure.

5. The denitration device for hydrochloric acid regeneration tail gas according to claim 1, characterized in that: A motor (26) is also fixedly mounted in the middle of the upper end of the gas washing tank (21), and the main shaft of the motor (26) passes through the upper end of the gas washing tank (21) and is fixedly connected to the stirring rod (27).

6. A denitration device for hydrochloric acid regeneration tail gas according to claim 5, characterized in that: The stirring rod (27) is configured as a rod-shaped structure made of corrosion-resistant material, and a stirring blade (271) is fixedly provided at the lower end of the outer side of the stirring rod (27).

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