CN216987049U - A defogging dust removal low row device for coal fired boiler flue gas purifies - Google Patents
A defogging dust removal low row device for coal fired boiler flue gas purifies Download PDFInfo
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- CN216987049U CN216987049U CN202220393492.5U CN202220393492U CN216987049U CN 216987049 U CN216987049 U CN 216987049U CN 202220393492 U CN202220393492 U CN 202220393492U CN 216987049 U CN216987049 U CN 216987049U
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Abstract
The utility model relates to a demisting and dedusting low-emission device for purifying flue gas of a coal-fired boiler, belonging to the technical field of particulate matter smoke dust control equipment of the coal-fired boiler; the top layer spraying layer, the turbulent flow device, the tube bundle dust remover group and the flat plate demister are arranged in the desulfurizing tower cylinder body from bottom to top in sequence; a desulfurizer is arranged in the top spraying layer, and an atomizing nozzle is arranged at the lower end of the top spraying layer; a back flushing pipeline is arranged below the turbulence device, and the turbulence device is connected with the back flushing pipeline below the turbulence device through a pipeline; the lower part of the tube bundle dust remover group is provided with a back flush pipeline, the upper part of the tube bundle dust remover group is provided with an atomizing water pipe, and the tube bundle dust remover group is respectively connected with the back flush pipeline and the atomizing water pipe through pipelines; back-flushing pipelines are respectively arranged above and below the flat demister, and the diameter-variable part of the desulfurization tower cylinder is arranged above the flat demister; the problems of long transformation period, high transformation investment and high operating cost faced by the traditional particulate smoke control equipment of the coal-fired boiler are solved.
Description
Technical Field
The utility model belongs to the technical field of particle smoke control equipment of coal-fired boilers, and particularly relates to a demisting and dedusting low-emission device for purifying smoke of a coal-fired boiler.
Background
As two serious problems which plague the sustainable development of countries in the world, the energy and the environment are increasingly concerned by people. A large amount of sulfur dioxide gas and dust generated in the process of energy utilization seriously affect the ecological environment and human health. At present, in the existing flue gas purification technologies at home and abroad, a respective removal mode is mostly adopted, and the defects of large occupied area of a treatment system, complex system, high equipment investment and operation cost and the like exist. Therefore, research and development of an integrated pollutant removal process with a compact structure, small floor area and low investment and operation cost becomes an important research direction in the current flue gas treatment field, in particular to a wet simultaneous desulfurization and dust removal technology. The novel wet flue gas simultaneous desulfurization and dust removal technology provided by the utility model has higher industrial application potential. The wet desulphurization process is the most widely used flue gas desulphurization technology in China and even in the world at present, is widely applied to the fields of power station boilers, industrial boilers and the like, and has the advantages of high desulphurization efficiency, strong adaptability, wide load regulation range and the like. The existing technical route is as follows: the emission requirements of SO2 less than 35mg/Nm3 and dust less than 5mg/Nm3 are generally met by adopting a technical route of adding a wet electric dust remover. But has the limitations of high investment, high operating cost, long reconstruction period and great reconstruction difficulty.
(1) The tail wet electrostatic dust and mist eliminator has large occupied area and huge consumed materials.
A large amount of ash powder generated during combustion of the coal-fired boiler and a large amount of fly ash particles contained in the flue gas are still partially brought into the flue gas in the desulfurizing tower after being treated by the bag-type dust remover; meanwhile, tiny gypsum particles are generated in the desulfurization reaction process, and dust emission exceeds standard due to the fact that flue gas from bottom to top in the desulfurization tower is discharged. Therefore, wet electrostatic dust removal demister equipment is required to be added at the tail of the desulfurizing tower, and the occupied area is large. In order to ensure better dust removal effect of the wet electrostatic dust removal demister, the flow velocity of the flue gas with the internal flow velocity is controlled to ensure 2.3m/s as much as possible, and the highest flow velocity does not exceed 2.5m/s, so that the sectional area is large, and a large amount of materials are required to manufacture the shell.
(2) The tail wet electrostatic dust collector demister has high energy consumption
The tail wet electric dust collector has huge running power consumption and high running cost. The high-voltage power supply of the wet electrostatic dust and mist eliminator is supplied after being rectified by a high-voltage rectifier through a step-up transformer. The negative pole of the high voltage direct current is transmitted to a high-frequency power supply device of the wet electrostatic dust removal demister by a high-voltage cable after passing through the damping resistor. The damping resistor buffers the current of the transient spark discharge and acts to suppress high frequency components. And a reactor is also connected between the power supply and the controlled silicon in series. The reactor is used for improving the voltage waveform to ensure that the voltage waveform is continuous and smooth, and is beneficial to obtaining higher running voltage and current; the current rise rate is limited, and the buffer effect is realized on the transient current change; and the higher harmonics of the power grid are suppressed, and the working condition of the silicon controlled rectifier is improved. The reactor is provided with a plurality of taps so as to be switched according to different high-voltage load currents. The larger the load current is, the fewer taps with fewer turns should be switched by the reactor, and the more taps with more turns should be switched on otherwise, so that the high-voltage power supply can stably operate.
(3) The potential safety hazard of a tail wet electrostatic dust removal demister is large
The tail wet electrostatic dust removal demister adopts conductive glass fiber reinforced plastics as an anode for dust collection, and the conductive glass fiber reinforced plastics are integrally and modularly arranged and can be in a honeycomb form or a plate form. The high-voltage power supply of the wet electrostatic dust and mist eliminator is supplied after being rectified by a high-voltage rectifier through a step-up transformer. The negative pole of the high voltage direct current is transmitted to the wet electrostatic dust removal demister by a high voltage cable after passing through the damping resistor. The wet electrostatic dust removal defroster allows certain cremation rate when normally working, spark discharge is transited to arc discharge, internal electrical components are easy to age because the running time is too long, and the glass fiber reinforced plastics are flammable materials, and after high-voltage electrification, the firing accident is caused by discharge.
Traditional coal fired boiler particulate matter smoke and dust controlgear generally adopts electrostatic precipitator, sack cleaner, the integrative dust remover of electric bag, and under better operating mode, particulate matter smoke and dust discharges and to control about 30mg/Nm 3. The wet electric dust collector faces the objective bottlenecks of long transformation period, high transformation investment and high running cost. The efficient dedusting and demisting device which is relatively simple in structure, relatively low in investment, economical in operating cost, short in transformation period and capable of stably achieving the national ultra-clean smoke emission standard is developed, and the efficient dedusting and demisting device has wide practical value and obvious practical significance at the present of the national great advocated energy conservation and emission reduction and ultra-clean emission.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes the defects of the prior art and provides a demisting and dedusting low-emission device for purifying the flue gas of a coal-fired boiler; the problem of the transformation cycle length that traditional coal fired boiler particulate matter smoke and dust controlgear faced, transformation investment is high, the working costs is many is solved.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
A demisting and dedusting low-emission device for purifying coal-fired boiler flue gas is arranged in a desulfurization tower cylinder and sequentially comprises a top layer spraying layer, a turbulent flow device, a tube bundle deduster group and a flat demister from bottom to top; a desulfurizer is arranged in the top spraying layer, and an atomizing nozzle is arranged at the lower end of the top spraying layer; a back flushing pipeline is arranged below the turbulence device, and the turbulence device is connected with the back flushing pipeline below the turbulence device through a pipeline; the lower part of the tube bundle dust remover group is provided with a back flush pipeline, the upper part of the tube bundle dust remover group is provided with an atomizing water pipe, and the tube bundle dust remover group is respectively connected with the back flush pipeline and the atomizing water pipe through pipelines; the upper part and the lower part of the flat demister are respectively provided with a back flush pipeline, and the upper part of the flat demister is a diameter-variable part of the desulfurization tower cylinder.
Furthermore, the back washing pipeline is kept horizontal, one end of the back washing pipeline extends out of the outer side of the desulfurizing tower cylinder, the other end of the back washing pipeline is kept closed, one end of the outer side of the back washing pipeline is connected with the back washing water inlet pipe, and back washing water is supplied to the interior of the first back washing pipeline through the back washing water inlet pipe.
Furthermore, electric valves are arranged on the back flushing pipelines.
Furthermore, the top layer spraying layer, the turbulence device, the tube bundle dust remover group and the flat demister are kept horizontal, and the inner section of the desulfurizing tower cylinder is completely covered.
Furthermore, the upper end of the back washing pipeline below the turbulent device is provided with a nozzle which faces upwards to the turbulent device
Furthermore, a nozzle is arranged at the lower end of the backwashing pipeline below the tube bundle dust remover group, and the nozzle faces downwards to the lining agglomerating device.
Furthermore, nozzles are arranged on the back-flushing pipelines above and below the flat demister, and face the flat demister.
Furthermore, two pressure difference detectors are arranged in the desulfurization tower cylinder, one pressure difference detector is positioned above the flat-plate demister, and the other pressure difference detector is positioned below the top-layer spraying layer.
Furthermore, the one end of atomizing water pipe stretches out to the desulfurizing tower outside, and the other end keeps sealing, and the one end in the outside is connected with the atomizing water inlet tube, through atomizing water inlet tube to the inside atomized water that supplies of atomizing water pipe.
Furthermore, the lower extreme of atomizing water pipe is provided with many connecting pipes, and the quantity of connecting pipe equals with the inside tube bank dust remover quantity of tube bank dust remover group, and the connecting pipe is connected with every tube bank dust remover respectively, imports the atomized water among the atomizing water pipe to the tube bank dust remover through the connecting pipe.
Compared with the prior art, the utility model has the following beneficial effects:
(1) convenient and fast 'integration':
the desulfurization, dedusting and demisting are completed in one absorption tower, and the flue gas can be discharged in an ultralow way through one tower.
(2) Purification "high efficiency":
high desulfurization efficiency, and the dust discharge at the outlet of the absorption tower reaches below 5mg/Nm and reaches the ultra-clean discharge standard
(3) The investment cost is low, and the operating cost is few:
the method also meets the requirement of emission indexes, saves about 30-50% of investment compared with the conventional technology, reduces the investment pressure of enterprises, realizes the integration of desulfurization, dust removal and demisting by adding components in the desulfurization tower, has no power consumption of the high-efficiency dust and mist removal device, has equivalent resistance to the mist removal device, and has the operation cost of 15-30% of that of the similar technology.
(4) Short construction period, small project amount and no extra land occupation:
the dust removal defogging towelization simultaneously cigarette tower unification, saves space.
(5) The system runs stably and has high reliability;
the system has strong adaptability to the content of smoke pollutants and load fluctuation, stable system operation, simple operation and high reliability.
Drawings
The utility model is described in further detail below with reference to the accompanying drawings:
FIG. 1 is a schematic structural view of the present invention as a whole;
FIG. 2 is a top view of a tube bundle dust collector stack;
wherein, 1 is a desulfurizing tower cylinder, 2 is a top layer spraying layer, 3 is a turbulent device, 4 is a tube bundle dust remover group, 5 is a flat plate demister, 6 is a first back flush pipeline, 7 is a second back flush pipeline, 8 is an atomizing water pipe, 9 is a third back flush pipeline, and 10 is a fourth back flush pipeline.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the utility model. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
As shown in figures 1-2, the utility model provides a demisting and dedusting low-emission device for purifying flue gas of a coal-fired boiler, which is arranged in a desulfurizing tower cylinder 1 and sequentially comprises a top-layer spraying layer 2, a turbulent device 3, a tube bundle deduster group 4 and a flat demister 5 from bottom to top.
The top layer sprays the level of layer 2 and sets up in the inside downside of desulfurizing tower barrel 1, covers the inside cross-section of desulfurizing tower barrel 1 completely, and the bottom end face that the top layer sprayed layer 2 evenly is provided with vertical decurrent atomizing nozzle, and the top layer sprays the inside desulfurizer that is provided with of layer 2, sprays the even atomizing of the inside desulfurizer of layer 2 into the liquid droplet blowout of particle diameter for 0.01-1mm downwards blowout through atomizing nozzle with the top layer.
The turbulence device 3 is arranged above the top spraying layer 2, the turbulence device 3 keeps horizontal, and the inner section of the desulfurizing tower cylinder body 1 is completely covered. A first back washing pipeline 6 is arranged between the turbulent device 3 and the top spraying layer 2, the first back washing pipeline 6 is kept horizontal, one end of the first back washing pipeline 6 extends out of the outer side of the desulfurizing tower cylinder body 1, the other end of the first back washing pipeline 6 is kept closed, one end of the outer side of the first back washing pipeline is connected with a back washing water inlet pipe, and back washing water is supplied into the first back washing pipeline 6 through the back washing water inlet pipe. The upper end of the first back-washing pipeline 6 is provided with a row of nozzles, and back-washing water is upwards sprayed out to the inside of the desulfurizing tower through the nozzles. The first backwash line 6 is connected to the turbulent device 3 via a plurality of lines, and backwash water is supplied to the inside of the turbulent device 3 via the first backwash line 6.
The tube bundle dust remover group 4 is arranged above the turbulence device 3, and the tube bundle dust remover keeps horizontal to completely cover the inner section of the desulfurizing tower cylinder body 1. A second backwashing pipeline 7 is arranged between the tube bundle dust remover group 4 and the turbulent flow device 3, the second backwashing pipeline 7 keeps horizontal, one end of the second backwashing pipeline 7 extends out of the outer side of the desulfurizing tower cylinder body 1, the other end of the second backwashing pipeline is kept closed, one end of the outer side of the second backwashing pipeline 7 is connected with a backwashing water inlet pipe, and backwashing water is supplied into the second backwashing pipeline 7 through the backwashing water inlet pipe. The lower end of the second backwashing pipeline 7 is provided with a row of nozzles, and backwashing water is sprayed downwards and upwards to the inside of the desulfurizing tower through the nozzles. The second backwash pipeline 7 is connected to the tube bundle dust collector 4 through a plurality of pipelines, and backwash water is supplied to the interior of the tube bundle dust collector 4 through the second backwash pipeline 7.
The top of tube bank dust remover group 4 is provided with a horizontally atomized water pipe 8, the one end of atomized water pipe 8 stretches out to the desulfurizing tower outside, and the other end keeps sealing, and the one end in the outside is connected with the atomized water inlet tube, through the atomized water inlet tube to 8 inside atomized water that supply of atomized water pipe. The lower extreme of atomizing water pipe 8 is provided with many connecting pipes, and the quantity of connecting pipe equals with the inside tube bank dust remover quantity of tube bank dust remover group 4, and the connecting pipe is connected with every tube bank dust remover respectively, imports the atomizing water in 8 atomizing water pipes to the tube bank dust remover in through the connecting pipe.
The flat demister 5 is arranged above the tube bundle dust collector group 4, and the flat demister 5 keeps horizontal and completely covers the inner section of the desulfurizing tower cylinder 1. A third backwashing pipeline 9 and a fourth backwashing pipeline 10 are respectively arranged below and above the flat demister 5, the third backwashing pipeline 9 and the fourth backwashing pipeline 10 are kept horizontal, one end of the third backwashing pipeline 9 and one end of the fourth backwashing pipeline 10 extend out of the desulfurization tower cylinder body 1, the other end of the third backwashing pipeline is kept closed, one end of the outer side of the third backwashing pipeline is connected with a backwashing water inlet pipe, and backwashing water is supplied to the third backwashing pipeline 9 and the fourth backwashing pipeline 10 through the backwashing water inlet pipe. The upper end of the third backwashing pipeline 9 is provided with a row of nozzles which face upwards to the flat demister 5; the lower end of the fourth backwash pipeline 10 is provided with a row of nozzles which face downwards towards the flat demister 5. Backwash water is ejected to the upper surface and the lower surface of the flat demister 5 through the third backwash line 9 and the fourth backwash line 10.
The diameter-variable position of the desulfurization tower cylinder body 1 is arranged above the fourth back-flushing pipeline 10.
Two pressure difference detectors are arranged inside the desulfurizing tower barrel body 1, one pressure difference detector is located above the flat demister 5, the other pressure difference detector is located below the top spraying layer 2, and the operating condition inside the device is detected through the two pressure difference detectors.
Electric valves are arranged on the four back flushing pipelines and are used for controlling the circulation of back flushing water in each back flushing pipeline.
The top layer sprays layer 2, turbulent device 3, tube bank dust remover group 4, flat plate defroster 5 and all fixes inside desulfurizing tower barrel 1 through detachable support piece.
The working principle of the utility model is as follows:
the ultrafine smoke dust particles are in a multiphase flow environment and have the following characteristics:
1. the particles are dispersed phases, the particle sizes are different, and the motion rules are different;
2. because the moving inertia of the solid particles is different from that of the liquid medium, the particles and the liquid medium have the difference of moving speed, namely relative speed;
3. the mutual collision and friction among particles and between the particles and the wall of the container have great influence on the movement;
4. under the condition of turbulent flow, the pulsation of the air flow has mutual influence on the motion rule of particles and the pulsation speed of the air flow due to the existence of the particles;
5. due to the existence of pressure and velocity gradients in the flow field, irregular particle shapes, interaction between particles and the wall of the device, and the like, the particles can rotate, so that a lift effect is generated.
Aiming at the complex working conditions, the device provided by the utility model adopts the following technical scheme:
raw flue gas coming out of the boiler enters the inside of the desulfurizing tower cylinder body 1 from the lower part through the induced draft fan, then passes through the atomizing spray absorption area in the middle of the desulfurizing tower, namely the top spray layer 2, and collides, adsorbs, dissolves and absorbs SO2 in the flue gas with a desulfurizing agent which is atomized into micro (0.01-1 mm) liquid drops.
The flue gas after the contact reaction with the desulfurization slurry can continuously pass through the turbulence device 3 and the tube bundle dust remover group 4 at the top of the desulfurization tower, and the tube bundle dust remover group 4 is a wet electrostatic dust removal demister. The tube bundle dust remover group 4 mainly depends on the characteristic that the low-temperature saturated clean flue gas at the upper part of the desulfurizing tower contains a large amount of fine fog drops, the probability of collision between fly ash particles and the fog drops is increased under the condition that the large amount of fine fog drops move at a high speed, and the fog drops and the fly ash particles are condensed, so that the capturing and removing of the part of extremely fine fly ash dust and the fog drops are realized.
Flue gas after the desulfurization is removed dust flows through flat plate demister 5 with certain speed, and the flue gas is by quick, change direction of motion in succession, and because of centrifugal force and inertial effect, the droplet in the flue gas is strikeed and is got off by the entrapment on the 5 blades of flat plate demister, and the droplet collects and forms rivers, because of the effect of gravity, falls to the thick liquid pond in, has realized gas-liquid separation for the flue gas of the defroster of flowing through reaches and discharges after the defogging requirement.
The defogging dust removal low row device comprises the defroster body and the back flush pipeline that the PP material was made and is formed, and the defroster body comprises each defroster unit block, easy to assemble, dismantlement and change. The back flush water pipe that each device set up comprises pipeline and nozzle, also can dismantle alone, makes things convenient for the maintenance. Set up the pressure differential monitor around the defroster, can carry out real-time supervision to the defroster operational aspect to set up automatic flushing electric valve for rinse-system, realize automatic interlocking with the pressure differential changer, but also manually operation of automatic operation.
The arrangement of the demister internal support should be suitable for installation and removal of internal components for maintenance. High-efficient dust removal defogging environment-friendly device is installed with single subassembly.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The utility model provides a low device of arranging of defogging dust removal for coal fired boiler flue gas purifies which characterized in that: the device is arranged in a desulfurizing tower cylinder body (1) and sequentially comprises a top layer spraying layer (2), a turbulence device (3), a tube bundle dust remover group (4) and a flat demister (5) from bottom to top; a desulfurizer is arranged in the top spraying layer (2), and an atomizing nozzle is arranged at the lower end of the top spraying layer; a back washing pipeline is arranged below the turbulence device (3), and the turbulence device (3) is connected with the back washing pipeline below through a pipeline; a backwashing pipeline is arranged below the tube bundle dust collector group (4), an atomized water pipe (8) is arranged above the tube bundle dust collector group, and the tube bundle dust collector group (4) is respectively connected with the backwashing pipeline and the atomized water pipe (8) through pipelines; the upper part and the lower part of the flat demister (5) are respectively provided with a back flush pipeline, and the upper part of the flat demister (5) is a reducing part of the desulfurizing tower cylinder body (1).
2. The device for removing mist and dust and low exhaust of the flue gas purification of the coal-fired boiler as recited in claim 1, wherein: the back washing pipeline is kept horizontal, one end of the back washing pipeline extends out of the outer side of the desulfurizing tower cylinder body (1), the other end of the back washing pipeline is kept closed, one end of the outer side of the back washing pipeline is connected with the back washing water inlet pipe, and back washing water is supplied into the first back washing pipeline (6) through the back washing water inlet pipe.
3. The device of claim 1, wherein the device comprises: electric valves are arranged on the back flushing pipelines.
4. The device of claim 1, wherein the device comprises: the top layer sprays layer (2), turbulent device (3), tube bank dust remover group (4), dull and stereotyped defroster (5) and all keeps the level, covers the inside cross-section of desulfurizing tower barrel (1) completely.
5. The device of claim 1, wherein the device comprises: the upper end of the back washing pipeline below the turbulent device (3) is provided with a nozzle which faces upwards to the turbulent device (3).
6. The device of claim 1, wherein the device comprises: the lower end of the back washing pipeline below the tube bundle dust remover group (4) is provided with a nozzle which faces downwards to the interior of the ball device.
7. The device of claim 1, wherein the device comprises: and nozzles are arranged on the back-flushing pipelines above and below the flat demister (5) and face the flat demister (5).
8. The device of claim 1, wherein the device comprises: two pressure difference detectors are arranged in the desulfurizing tower cylinder body (1), one pressure difference detector is positioned above the flat demister (5), and the other pressure difference detector is positioned below the top spraying layer (2).
9. The device of claim 1, wherein the device comprises: one end of the atomized water pipe (8) extends out of the desulfurizing tower, the other end of the atomized water pipe is kept closed, one end of the outer side of the atomized water pipe is connected with the atomized water inlet pipe, and atomized water is supplied to the inside of the atomized water pipe (8) through the atomized water inlet pipe.
10. The device of claim 9, wherein the device comprises: the lower extreme of atomizing water pipe (8) is provided with many connecting pipes, and the quantity of connecting pipe equals with the inside tube bank dust remover quantity of tube bank dust remover group (4), and the connecting pipe is connected with every tube bank dust remover respectively, imports the atomizing water in the atomizing water pipe (8) to the tube bank dust remover in through the connecting pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220393492.5U CN216987049U (en) | 2022-02-25 | 2022-02-25 | A defogging dust removal low row device for coal fired boiler flue gas purifies |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220393492.5U CN216987049U (en) | 2022-02-25 | 2022-02-25 | A defogging dust removal low row device for coal fired boiler flue gas purifies |
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| CN216987049U true CN216987049U (en) | 2022-07-19 |
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| CN202220393492.5U Active CN216987049U (en) | 2022-02-25 | 2022-02-25 | A defogging dust removal low row device for coal fired boiler flue gas purifies |
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