Biomass boiler SCR (Selective Catalytic Reduction) denitration front ash catching system
By using a combination of inverted V-shaped stainless steel crimped mesh, sonic soot blower, and jet pipe in the biomass boiler SCR system, the problem of fly ash clogging the catalyst was solved, achieving efficient ash removal and extending equipment life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-03-24
AI Technical Summary
In existing biomass boiler SCR denitrification systems, fly ash easily clogs the catalyst channels, leading to catalyst poisoning and deactivation. Furthermore, existing ash collectors are prone to clogging, making ash removal difficult and affecting filtration efficiency and service life.
The stainless steel crimped wire mesh has an inverted V-shaped structure. Combined with an acoustic soot blower and a blowpipe, it forms a two-way dust removal mechanism. It uses gravity, acoustic vibration and fluidizing air to break down the adhesion of dust particles. With the help of fixing components, it enhances the pressure resistance and ensures that the dust is discharged smoothly.
It effectively prevents filter clogging, extends service life, improves dust removal efficiency, ensures normal operation of catalyst, and reduces environmental pressure on engineering projects.
Smart Images
Figure CN224024579U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to waste gas denitration technical field, concretely is a kind of biomass boiler SCR denitration pre-catch dust system. BACKGROUND
[0002] Biomass boiler is using renewable energy biomass as fuel, fuel composition is complex, contains nitrogen element, sulfur element etc., combustion can emit a large amount of nitrogen oxides, sulfide, smoke dust and other harmful substances, not only pollute the environment, also can cause certain harm to human health.So according to environmental protection requirement, must carry out denitration, desulfurization and dust removal to the tail gas generated by biomass boiler.
[0003] The inventor finds that the mainstream denitration technology is selective non-catalytic reduction method (SNCR) and selective catalytic reduction method (SCR).Among them, the SCR denitration process, because the SCR denitration reactor is arranged in the tail flue of biomass boiler, because dust removal is not carried out, the alkali metal component of biomass boiler fuel is as high as about 8%-10%, so the fly ash humidity generated after combustion is high and sticky, easy to adhere to the surface of catalyst or block the pore of catalyst, lead to catalyst poisoning inactivation, at the same time, fly ash also impacts catalyst, and the abrasion is also more serious;In this high dust environment, the biomass SCR denitration catalyst is blocked / inactivated / abraded in a short period of time, about a month, in engineering, which brings great environmental protection pressure to enterprises.
[0004] In order to avoid that the smoke dust in flue gas enters the SCR reactor, the existing SCR pre-catch dust collector adopts horizontal filter screen structure, and the ash is easy to accumulate on the surface of filter screen, leading to difficult dust removal, and the filter screen is easy to be blocked.The fixed mode of filter screen, such as welding or simple bolt connection, under the high ash falling load of biomass boiler, is easy to cause the filter screen to be concave and deformed due to insufficient structural strength, affecting the filtering efficiency and service life.The dust blower of single direction blowing is difficult to cover all areas of filter screen, and the ash suction effect is not good, leading to dead angle dust accumulation, at the same time, the fly ash of biomass is strongly cohesive, and the filter screen is easy to be blocked during dust catching. UTILITY MODEL CONTENTS
[0005] In order to solve the deficiency of prior art, the utility model aims at providing a biomass boiler SCR denitration pre-catch dust system.
[0006] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a biomass boiler SCR denitration pre-catch dust system, comprising stainless steel embossed screen, sound wave dust blower, blowing pipe, fixing assembly and ash removal device, the stainless steel embossed screen is in inverted V-shaped structure, the sound wave dust blower is arranged above the stainless steel embossed screen, the blowing pipe is arranged below the stainless steel embossed screen, the fixing assembly is arranged on the stainless steel embossed screen, and the ash removal device is arranged on both sides of the lower end of the stainless steel embossed screen.
[0007] Preferably, the blowing pipe can be connected to compressed gas, the blowing pipe is composed of a blowing main pipe and blowing branch pipes, the blowing branch pipes are symmetrically arranged on both sides of the blowing main pipe, and the blowing branch pipes are arranged in parallel with the stainless steel embossing screen.
[0008] Preferably, a plurality of Venturi nozzles are equidistantly arranged on each of the blowing branch pipes, and the Venturi nozzles are perpendicular to the stainless steel embossing screen.
[0009] Preferably, the angle between the blowing branch pipe and the horizontal direction is 30°.
[0010] Preferably, the fixing assembly comprises a bolt, a nut, a washer, a steel plate and an equal angle steel, corresponding positions on the steel plate, the equal angle steel and the stainless steel embossing screen are respectively provided with fixing holes, the bolt penetrates the lower washer, the equal angle steel, the stainless steel embossing screen, the steel plate and the upper washer in sequence and is threadedly connected with the nut.
[0011] Preferably, the bolt, the nut and the washer are made of stainless steel, and the steel plate and the equal angle steel are made of Q345-B.
[0012] Preferably, the stainless steel embossing screen comprises a left stainless steel embossing screen and a right stainless steel embossing screen, the left stainless steel embossing screen and the right stainless steel embossing screen are fixed by single-side welding of two angle steels, and the surface of the screen body is reinforced by the steel plate and the equal angle steel.
[0013] Preferably, the acoustic blowing port of the acoustic soot blower is perpendicular to the stainless steel embossing screen.
[0014] Preferably, the angle between the stainless steel embossing screen and the horizontal direction is 30°.
[0015] Preferably, the ash discharging device comprises a sliding ash pipe, a buffer bin, a balance valve, an induced draft fan and a bin pump, the buffer bin is arranged on the sliding ash pipe, the buffer bin is connected with the induced draft fan through the balance valve, and the buffer bin is connected with the bin pump.
[0016] The inverted V-shaped structure of the stainless steel embossing screen makes the fly ash naturally slide to the two side ash slide pipes under the action of gravity, avoids the problem of horizontal filter screen plane accumulation, the ultrasonic wave of the sonic soot blower is transmitted to the stainless steel embossing screen through air, the stainless steel embossing screen is vibrated to accelerate the fly ash sliding, the fluidized air of the blowing pipe continuously disturbs the ash layer on the surface of the stainless steel embossing screen, the adhesion between the ash particles is destroyed, the adhesion fly ash is loosened by the sonic wave, the physical peeling is realized by the fluidized air flow, the two-way action covers the front and back surfaces of the filter screen, the dead angle of soot removal is eliminated, the filter screen is effectively prevented from being blocked, the V-shaped structure disperses stress, the overall compression resistance of the stainless steel embossing screen is enhanced by cooperating with the fixed assembly, the stainless steel embossing screen is prevented from being depressed and deformed under high load, when ash needs to be transported, the negative pressure at the inlet of the induced draft fan is greater than the negative pressure at the ash discharge port of the lower end of the stainless steel embossing screen, the negative pressure state in the ash slide pipe is ensured, the ash is beneficially sucked, and the fly ash in the ash slide pipe is smoothly fallen into the bin pump. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a structure diagram of a biomass boiler SCR denitration pre-ash catching system of the utility model;
[0018] Figure 2 The utility model provides Figure 1 It is a top enlarged schematic view of A-A.
[0019] Figure 3 The utility model provides Figure 1 It is a structure enlarged schematic view of I and II, a is the side view of I, b is the front view of I, and c is the side view of II.
[0020] Figure 4 The utility model provides Figure 1 It is a top enlarged schematic view of the blowing pipe.
[0021] In the drawing: 1, bolt; 2, nut; 3, flat washer; 4, stainless steel embossing screen; 5, steel plate; 6, equal angle steel; 7, sonic soot blower; 8, ash slide pipe; 9, bin pump; 10, SCR denitration reactor; 11, blowing main pipe; 12, blowing branch pipe; 13, venturi nozzle; 14, buffer bin; 15, balance valve; 16, induced draft fan. DETAILED DESCRIPTION
[0022] The technical scheme 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 and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the range protected by the utility model.
[0023] Referring to Figures 1-3 The biomass boiler SCR denitration pre-ash capturing system comprises a stainless steel embossed net 4, a sonic ash blower 7, a blowing pipe, a fixing assembly and an ash discharging device. The stainless steel embossed net 4 is in an inverted V-shaped structure. The sonic ash blower 7 is arranged above the stainless steel embossed net 4. The blowing pipe is arranged below the stainless steel embossed net 4. The fixing assembly is arranged on the stainless steel embossed net 4. The ash discharging device is arranged at both sides of the lower end of the stainless steel embossed net 4.
[0024] The mounting mode of the blowing pipe in the embodiment can adopt an existing fixed mounting mode, that is, the blowing pipe is connected with the boiler wall through a flange and is fastened through a bolt, and the air tightness is ensured in combination with a sealing gasket.
[0025] The inverted V-shaped structure of the stainless steel embossed net 4 enables the fly ash to naturally slide to both sides of the ash discharging pipe 8 under the action of gravity, thereby avoiding the problem of horizontal filter screen plane accumulation. Meanwhile, the ultrasonic waves of the sonic ash blower 7 are transmitted to the stainless steel embossed net 4 through the air, the stainless steel embossed net 4 is vibrated to accelerate the dust sliding, and the surface ash layer of the stainless steel embossed net 4 is continuously disturbed by the fluidized wind of the blowing pipe to destroy the bonding force between the ash particles and prevent caking. The sonic ash blower 7 above the stainless steel embossed net 4 and the blowing pipe below the stainless steel embossed net 4 form bidirectional ash cleaning, which is more comprehensive. The sonic waves can loosen the cohesive fly ash, and the fluidized wind flow realizes physical peeling. The bidirectional action covers both sides of the filter screen, eliminates the ash cleaning dead angle, effectively prevents the filter screen from being blocked, disperses the stress through the V-shaped structure, and enhances the overall compression resistance of the stainless steel embossed net 4 in combination with the fixing assembly to avoid the stainless steel embossed net 4 from being depressed and deformed under high load.
[0026] The blowing pipe can be connected with compressed gas. The blowing pipe is composed of a blowing main pipe 11 and blowing branch pipes 12. The blowing branch pipes 12 are symmetrically arranged at both sides of the blowing main pipe 11. The blowing branch pipes 12 are arranged in parallel with the stainless steel embossed net 4. A plurality of Venturi nozzles 13 are equidistantly arranged on each blowing branch pipe 12. The Venturi nozzles 13 are perpendicular to the stainless steel embossed net 4. The included angle between the blowing branch pipe 12 and the horizontal direction is 30°.
[0027] The blowing branch pipes 12 connected with the compressed gas are distributed along the axis of the blowing main pipe 11 to form a uniform airflow coverage network, which ensures the consistency of ash cleaning in the length direction of the filter screen. In combination with the sonic ash blowing, a synergistic ash cleaning effect is formed. The high-speed injection airflow is generated by the Venturi nozzles 13, which can penetrate the filter screen pores through vertical injection to effectively remove the embedded ash particles. In combination with the inverted V-shaped structure, a turbulent flow is formed to enhance the flowability of the ash.
[0028] The blowing branch pipes 12 are arranged in parallel with the stainless steel embossed net 4, and the included angle between the blowing branch pipes 12 and the horizontal direction is 30°. Therefore, the entire blowing branch pipe 12 is also in an inverted V-shaped structure. The blowing branch pipes 12 are staggered with the fixing assembly to avoid the blowing pipe from being vertically injected onto the fixing assembly.
[0029] The fixed assembly comprises a bolt 1, a nut 2, a flat washer 3, a steel plate 5 and an equal angle steel 6, the steel plate 5, the equal angle steel 6 and the corresponding positions on the stainless steel rolling screen 4 are respectively provided with fixed holes, the bolt 1 is sequentially threaded through the lower flat washer 3, the equal angle steel 6, the stainless steel rolling screen 4, the steel plate 5 and the upper flat washer 3 and is threadedly connected with the nut 2; the stainless steel rolling screen 4 comprises a left stainless steel rolling screen and a right stainless steel rolling screen, the left stainless steel rolling screen and the right stainless steel rolling screen are fixedly welded with the single edges of the two angle steels and are reinforced by the steel plate 5 and the equal angle steel 6 on the surface of the screen body.
[0030] The bolt 1, the nut 2 and the flat washer 3 are made of stainless steel, and the steel plate 5 and the equal angle steel 6 are made of Q345-B, which has high strength and high temperature corrosion resistance.
[0031] The acoustic blowing port of the acoustic soot blower 7 is perpendicular to the stainless steel rolling screen 4, so that the acoustic energy is concentrated on the filter screen plane.
[0032] The angle between the stainless steel rolling screen and the horizontal direction is 30°.
[0033] The ash discharging device comprises a dust discharging pipe 8, a buffer bin 14, a balance valve 15, an induced draft fan 16 and a bin pump 9, the dust discharging pipe 8 is provided with the buffer bin 14, the buffer bin 14 is connected with the induced draft fan 16 through the balance valve 15, and the buffer bin 14 is connected with the bin pump 9.
[0034] The bin pump 9 of the embodiment can adopt an existing structure, when dust needs to be discharged, the balance valve is opened, the negative pressure state in the dust discharging pipe can be ensured, dust suction is facilitated, the fly ash in the dust discharging pipe can smoothly fall into the bin pump, and dust can be smoothly discharged.
[0035] The ash discharging process of the biomass boiler SCR denitration pre-capturing ash system is as follows:
[0036] Dusty flue gas enters the system and is filtered through the inverted V-shaped stainless steel rolling screen 4. The stainless steel rolling screen 4 is in an inverted V-shaped structure, so that the fly ash naturally slides to the two dust discharging pipes 8 under the action of gravity, the ultrasonic wave of the acoustic soot blower 7 is transmitted to the stainless steel rolling screen 4 through the air, the vibration of the stainless steel rolling screen 4 accelerates the sliding of the dust, the fluidized air of the blowing pipe continuously disturbs the ash layer on the surface of the stainless steel rolling screen 4, the bonding force between the ash particles is destroyed, and caking is prevented, when dust needs to be discharged, the balance valve 15 and the induced draft fan 16 are opened, the negative pressure at the inlet of the induced draft fan is greater than that of the ash discharging port at the lower end of the stainless steel rolling screen, the negative pressure state in the dust discharging pipe can be ensured, dust suction is facilitated, the fly ash in the dust discharging pipe can smoothly fall into the bin pump, and the ash discharging is completed.
[0037] Although the utility model has been explained in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A biomass boiler SCR denitration pre-ash catching system, characterized in that: The utility model provides a kind of sound wave soot blower, spray pipe, fixed component and ash removal device including stainless steel embossing net, the stainless steel embossing net is inverted V letter structure, the sound wave soot blower is arranged above stainless steel embossing net, the spray pipe is arranged below stainless steel embossing net, fixed component is arranged on stainless steel embossing net, and ash removal device is arranged in the lower end both sides of stainless steel embossing net.
2. The ash-trap system in front of the SCR denitration of the biomass boiler according to claim 1, characterized in that: The spray pipe can be connected to compressed gas, and the spray pipe is composed of a spray main pipe and spray branch pipes.
3. The ash-trap system in front of the SCR denitration of the biomass boiler according to claim 2, characterized in that: Each spray branch pipe is provided with a plurality of Venturi nozzles at equal intervals, and the Venturi nozzles are perpendicular to the stainless steel embossing net.
4. The ash-trap system in front of the SCR denitration of the biomass boiler according to claim 2, characterized in that: The spray branch pipe forms an angle of 30° with the horizontal direction.
5. The ash-trap system in front of the SCR denitration of the biomass boiler according to claim 1, characterized in that: The fixed component includes bolts, nuts, washers, steel plates and equal-leg angle steels.
6. The ash-trap system for the biomass boiler SCR denitration of claim 5, wherein: The bolts are sequentially threaded through the lower washers, equal-leg angle steels, stainless steel embossing nets, steel plates and upper washers, and are threadedly connected with the nuts.
7. The ash-trap system for the biomass boiler SCR denitration of claim 5, wherein: The bolts, nuts and washers are made of stainless steel, and the steel plates and equal-leg angle steels are made of Q345-B.
8. The ash-trap system in front of the SCR denitration of the biomass boiler according to claim 1, characterized in that: The stainless steel embossing net includes a left stainless steel embossing net and a right stainless steel embossing net.
9. The ash-trap system in front of the SCR denitration of the biomass boiler according to claim 1, characterized in that: The sound wave soot blower is perpendicular to the stainless steel embossing net.
10. The ash-trap system for the biomass boiler SCR denitration according to claim 1, characterized in that: The stainless steel embossing net forms an angle of 30° with the horizontal direction. The ash removal device includes ash removal pipes, buffer bins, balance valves, induced draft fans and bin pumps. The buffer bins are connected to the induced draft fans through the balance valves, and are connected to the bin pumps.