Tunnel kiln flue gas desulfurization and denitrification equipment

Abstract

The utility model discloses flue gas desulfurization and denitrification equipment for a tunnel kiln, and belongs to the technical field of flue gas treatment. Comprising a fixing mechanism and a purifying mechanism, the fixing mechanism comprises an outer box, a cavity penetrating through the two ends of the outer box is formed in the outer box, a top plate and a bottom plate are fixed to the bottom face and the top face of the outer box through screws correspondingly, the two ends of the cavity are blocked by the top plate and the bottom plate correspondingly, and waste gas to be purified enters the cavity through the bottom plate and flows out of the cavity through the top plate; the purification mechanism comprises a demister, a plurality of guide plates and a catalyst, the demister, the plurality of guide plates and the catalyst are sequentially mounted in the cavity from bottom to top, the purification mechanism further comprises a liquid discharge part and an exhaust part, the liquid discharge part discharges limestone slurry to the position between the guide plates and the catalyst, and the exhaust part discharges ammonia gas to the position above the catalyst.

Description

TECHNICAL FIELD

[0001] The utility model relates to tunnel kiln flue gas desulfurization and denitrification equipment. BACKGROUND

[0002] Tunnel kilns are widely used in industrial production, such as ceramic and brick manufacturing industries. However, the combustion process of tunnel kilns produces a large amount of flue gas containing sulfur dioxide and nitrogen oxides. Emission into the atmosphere will form acid rain, causing serious damage to soil, water bodies, and buildings. Not only will it form acid rain, but it will also cause photochemical smog, endangering human health and the ecological environment.

[0003] Currently, traditional tunnel kiln flue gas desulfurization and denitrification technology has many problems. Some desulfurization and denitrification equipment uses single desulfurization or denitrification process, which cannot simultaneously and efficiently remove both pollutants, resulting in flue gas emissions that are difficult to meet strict environmental standards. Some equipment has complex structure, large floor area, and high construction and operation cost, increasing the burden of enterprises. Therefore, it is urgent to develop an efficient, economical, and environmentally friendly tunnel kiln flue gas desulfurization and denitrification equipment. SUMMARY

[0004] The purpose of the utility model is to provide a tunnel kiln flue gas desulfurization and denitrification equipment to solve the problems raised in the background technology.

[0005] In view of the above problems, the technical solution proposed by the utility model is:

[0006] A tunnel kiln flue gas desulfurization and denitrification equipment, comprising: a fixing mechanism, a purification mechanism.

[0007] Further, the fixing mechanism comprises an outer box, the inner part of the outer box has a cavity passing through both ends, the bottom surface and the top surface of the outer box are respectively fixed with a top plate and a bottom plate through screws, and the top plate and the bottom plate respectively plug the two ends of the cavity. This design facilitates the installation and maintenance of the equipment. When the internal part of the equipment needs to be repaired or replaced, the top plate or bottom plate can be easily removed by disassembling the screws; the exhaust gas to be purified enters the cavity through the bottom plate and flows out from the cavity through the top plate, thus providing a stable channel for the purification of exhaust gas; the outer box is square, and support feet are installed on the four sides of its side surface. The support feet can stably support the equipment, keeping it stable during operation, avoiding the influence of equipment shaking on desulfurization and denitrification effect, and facilitating ventilation and heat dissipation at the bottom of the equipment and maintenance operation of the parts at the bottom of the equipment.

[0008] Further, the purification mechanism comprises a demister, a plurality of guide plates and a catalyst, and the demister, the plurality of guide plates and the catalyst are sequentially installed in the cavity from bottom to top. The demister can effectively remove water mist in the flue gas, preventing the water mist from adversely affecting subsequent desulfurization and denitrification reactions and equipment components. The plurality of guide plates are arranged in a row and are arranged in parallel with the demister, and the guide plates are wavy. The wavy design increases the contact area of the flue gas with the guide plates, prolongs the residence time of the flue gas in the equipment, enables the flue gas to more fully contact and react with the desulfurization and denitrification reagent, and improves the desulfurization and denitrification efficiency. The catalyst is honeycomb-shaped. The honeycomb structure has a large specific surface area, which can increase the contact area of the catalyst with pollutants in the flue gas, improve the catalytic reaction efficiency, promote the reduction reaction of nitrogen oxides and ammonia gas under the action of the catalyst, and achieve the purpose of denitrification.

[0009] Further, the purification mechanism further comprises a liquid discharge member and an air discharge member, the liquid discharge member discharges the limestone slurry between the guide plates and the catalyst, and the air discharge member discharges ammonia gas above the catalyst. The liquid discharge member comprises a first pipeline installed on the outside of the outer box, a pair of first nozzles installed on the inner wall of the cavity, a pair of the first nozzles are located between the guide plates and the catalyst, the first pipeline and the pair of the first nozzles are connected, the first pipeline has a liquid inlet, and the first nozzles are atomizing nozzles. The atomizing nozzles can atomize the limestone slurry into fine droplets, increase the contact area of the limestone slurry with the flue gas, enable the limestone slurry to more fully react with sulfur dioxide in the flue gas, and improve the desulfurization efficiency. The limestone slurry is delivered to the first nozzles through the first pipeline, achieving the removal of sulfur dioxide in the flue gas.

[0010] Further, the air discharge member comprises a second pipeline installed on the outside of the outer box, a pair of second nozzles installed on the inner wall of the cavity, a pair of the second nozzles are located above the catalyst, the second pipeline and the pair of the second nozzles are connected, and the second pipeline has an air inlet. Ammonia gas is discharged above the catalyst through the second pipeline and the second nozzles, enabling the ammonia gas to fully react with the flue gas under the action of the catalyst, removing nitrogen oxides in the flue gas, and achieving the denitrification function.

[0011] Further, the top surface of the top plate is provided with a plurality of air discharge holes, and the flue gas after purification is discharged from the equipment through the air discharge holes. The bottom surface of the bottom plate is provided with an air inlet hole and a liquid discharge hole, the exhaust gas to be purified enters the equipment through the air inlet hole, and the reaction liquid is discharged from the equipment through the liquid discharge hole, facilitating the circulation and treatment of the exhaust gas and the liquid in the equipment.

[0012] Compared with the prior art, the tunnel kiln flue gas desulfurization and denitrification equipment has the beneficial effects that: through the integrated structural design, the tunnel kiln flue gas desulfurization and denitrification equipment can simultaneously and efficiently remove sulfur dioxide and nitrogen oxides in the flue gas, so that the emitted flue gas is more easily to reach the environmental protection standard; the equipment structure is relatively simple, the occupied area is reduced, and the construction and operation costs are reduced; the components work cooperatively, the desulfurization and denitrification efficiency is improved, and an efficient, economical and environmentally-friendly solution is provided for the tunnel kiln flue gas treatment. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A three-dimensional structural schematic view of the tunnel kiln flue gas desulfurization and denitrification equipment is disclosed for the embodiments of the utility model.

[0014] Figure 2 A first explosion structural schematic view of the tunnel kiln flue gas desulfurization and denitrification equipment is disclosed for the embodiments of the utility model.

[0015] Figure 3 A second explosion structural schematic view of the tunnel kiln flue gas desulfurization and denitrification equipment is disclosed for the embodiments of the utility model.

[0016] In the drawing: 100, fixing mechanism; 1001, outer box; 1002, supporting leg; 1003, top plate; 1004, bottom plate; 1005, exhaust hole; 1006, liquid discharge hole; 1007, air inlet hole; 200, purification mechanism; 2001, demister; 2002, guide plate; 2003, catalyst; 2004, first pipeline; 2005, first spray head; 2006, second pipeline; 2007, second spray head. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the protection scope of the utility model.

[0018] Please refer to Figure 1 - Figure 3 The utility model provides a technical scheme: a tunnel kiln flue gas desulfurization and denitrification equipment, comprising the following steps:

[0019] Place the desulfurization and denitrification equipment in an open and flat field near the ceramic tunnel kiln. Use a level to calibrate and ensure that the outer box 1001 is in a horizontal state, so that the support feet 1002 are evenly stressed to prevent the equipment from tilting. Use screws to firmly install the top plate 1003 and the bottom plate 1004 on the outer box 1001, and check the sealing of the connection parts to prevent exhaust gas leakage. Connect the first pipeline 2004 with the limestone slurry storage tank, ensure that the pipeline connection is tight and leak-free, and open the valve to check whether the limestone slurry can be smoothly transported. Connect the second pipeline 2006 with the ammonia storage tank, and also check the connection and whether the gas transportation is smooth. Check whether the installation of the demister 2001, the guide plate 2002, and the catalyst 2003 is stable and whether there is any damage. Test the spraying and gas injection effects of the first spray head 2005 and the second spray head 2007 to ensure that they can work normally.

[0020] After the tunnel kiln starts running, high-temperature flue gas containing sulfur dioxide, nitrogen oxides, and water mist enters the cavity of the equipment through the gas inlet hole 1007 of the bottom plate 1004 from the pipeline. The flue gas first contacts the demister 2001, which traps the water mist in the flue gas to prevent it from affecting the subsequent reaction. The flue gas without water mist continues to rise and encounters the wavy guide plate 2002. The guide plate 2002 changes the flow path of the flue gas, making it flow in a circuitous manner within the equipment, thereby prolonging the residence time and increasing the contact opportunity with the desulfurization and denitrification reagents. At this time, the valve on the first pipeline 2004 is opened, and the limestone slurry is sprayed into the space between the guide plate 2002 and the catalyst 2003 after being atomized by the first spray head 2005. The atomized limestone slurry mixes well with the flue gas, and the calcium carbonate in it reacts with sulfur dioxide to produce calcium sulfite and other substances, achieving the removal of sulfur dioxide. At the same time, the valve on the second pipeline 2006 is opened, and ammonia is sprayed into the upper part of the catalyst 2003 through the second spray head 2007. Under the action of the honeycomb-shaped catalyst 2003, ammonia and nitrogen oxides undergo a reduction reaction, converting nitrogen oxides into nitrogen and water, and completing the denitrification process.

[0021] During equipment operation, the operating conditions of each component are checked regularly. Check whether the first spray head 2005 and the second spray head 2007 are blocked every day, and clean or replace the spray head in time if there is blockage. Check the demister 2001 every week, clean the surface trapped water mist and impurities to ensure the demisting effect. Check the activity of the catalyst 2003 every month, and regenerate or replace it if the catalyst activity decreases. At the same time, use gas detection instruments installed at the inlet and outlet of the equipment to monitor the concentrations of sulfur dioxide and nitrogen oxides in the flue gas in real time. According to the monitoring data, adjust the injection amount of limestone slurry and ammonia to ensure stable desulfurization and denitrification effect. Regularly clean the waste liquid discharged from the drain hole 1006 of the bottom plate 1004 to prevent the accumulation of waste liquid affecting the normal operation of the equipment.

Claims

1. A tunnel kiln flue gas desulfurization and denitrification apparatus, characterized by, The utility model relates to a kind of waste gas purification device, including: Fixing mechanism (100), the fixing mechanism (100) includes outer box (1001), the inside of outer box (1001) has cavity through both ends thereof, the bottom surface and top surface of outer box (1001) are respectively fixed with top plate (1003) and bottom plate (1004) by screw, and top plate (1003) and bottom plate (1004) respectively plug up both ends of cavity, waste gas to be purified enters cavity by bottom plate (1004), and flows out from cavity by top plate (1003); Purification mechanism (200), the purification mechanism (200) includes demister (2001), several guide plates (2002), catalyst (2003), and demister (2001), several guide plates (2002), catalyst (2003) are sequentially installed in cavity from bottom to top, the purification mechanism (200) further includes liquid discharge piece and exhaust piece, the liquid discharge piece discharges limestone slurry to between guide plate (2002), catalyst (2003), and the exhaust piece discharges ammonia to above catalyst (2003).

2. The tunnel kiln flue gas desulfurization and denitrification equipment according to claim 1, characterized in that, The liquid discharge piece includes first pipeline (2004) installed outside outer box (1001), a pair of first spray head (2005) installed on the inner wall of cavity, a pair of first spray head (2005) is located between guide plate (2002), catalyst (2003), first pipeline (2004) and a pair of first spray head (2005) are connected, and first pipeline (2004) has liquid inlet.

3. The tunnel kiln flue gas desulfurization and denitrification equipment according to claim 1, characterized in that, The exhaust piece includes second pipeline (2006) installed outside outer box (1001), a pair of second spray head (2007) installed on the inner wall of cavity, a pair of second spray head (2007) is located above catalyst (2003), second pipeline (2006) and a pair of second spray head (2007) are connected, and second pipeline (2006) has gas inlet.

4. The tunnel kiln flue gas desulfurization and denitrification equipment according to claim 2, characterized in that, The first spray head (2005) is atomizing spray head.

5. The tunnel kiln flue gas desulfurization and denitrification equipment according to claim 1, characterized in that, Several guide plates (2002) form a line, and are arranged parallel to demister (2001), and guide plate (2002) is wave-shaped.

6. The tunnel kiln flue gas desulfurization and denitrification equipment according to claim 1, characterized in that, The catalyst (2003) is honeycomb-shaped.

7. The tunnel kiln flue gas desulfurization and denitrification equipment according to claim 1, characterized in that, The top surface of top plate (1003) is provided with a plurality of exhaust holes (1005), and the bottom surface of bottom plate (1004) is provided with gas inlet hole (1007) and liquid discharge hole (1006).

8. The tunnel kiln flue gas desulfurization and denitrification equipment according to claim 1, characterized in that, The outer box (1001) is square, and support leg (1002) is installed on four sides of its side.

Images