Novel desulfurization and denitrification device for coal-fired boiler

Abstract

The invention discloses a novel desulfurization and denitrification device for a coal-fired boiler, and belongs to the technical field of boiler flue gas treatment. Comprising a desulfurization bin, a dust remover and a denitration tower which are sequentially arranged, flue gas is introduced into the lower end of the desulfurization bin, and the treated flue gas is discharged from the upper part of the denitration tower; an air inlet layer, a heat exchange layer and a spraying layer are sequentially arranged in the desulfurization bin from bottom to top, and a conical protruding top cover is arranged at the top of the desulfurization bin; the central position of the top end of the top cover is connected with a pipeline to a dust remover; a heat conduction pipe is led out from the heat exchange layer to a flue gas heating layer of the denitration tower. According to the invention, the temperature of the flue gas is reduced, and heat is led out for supply; a crater-shaped partition plate with an upward gathering and protruding center is arranged to gather the flue gas at the lower layer and form a spraying layer bottom surface with a gradient; the external expansion nozzles are arranged above and below the spray pipe, so that the diffusion effect of the spray layer is better, and the overall desulfurization effect is stronger; and the baffling layer reduces the flowing speed of the flue gas, improves the dispersion effect and further performs reaction.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of boiler flue gas treatment, in particular to a novel desulfurization and denitrification device for coal-fired boilers. BACKGROUND

[0002] Sulfur, chlorine and nitrogen oxides produced by coal combustion are the main sources of air pollution; they form acid rain, destroy the ecological environment, and also form photochemical smog, endangering human health. People's attention to the environment and the improvement of environmental legislation standards urgently need to study the control methods of multiple pollutants such as SO2, NOx, Hg and PM2.5. Domestic research on desulfurization and denitrification has been relatively mature, but most of the processes are only useful for single components, such as desulfurization or denitrification.

[0003] Patent No. 2011102527398 discloses a flue gas purification equipment for small and medium-sized coal-fired boilers, which comprises a desulfurization and dust removal tower and a desulfurization and denitrification tower. The desulfurization and denitrification tower is located behind the desulfurization and dust removal tower, and the two are communicated through a top beam flue. It is a desulfurization, dust removal and denitrification integrated equipment. The desulfurization and denitrification tower comprises an upper oxidation absorbent injection device and a lower flue gas outlet flue. The upper oxidation absorbent injection device comprises a spray pipe and a nozzle installed on the spray pipe. The nozzle sprays oxidizing absorbent H2O2 downward to remove sulfides and nitrogen oxides in the flue gas. After desulfurization, dust removal and dehydration in the desulfurization and dust removal tower, the flue gas enters the desulfurization and denitrification tower through the beam flue for further desulfurization and denitrification. The oxidation absorbent injection device arranged at the upper part of the desulfurization and denitrification tower can be set to multiple layers according to the parameters of the flue gas. The purified flue gas is discharged from the lower flue gas outlet flue of the desulfurization and denitrification tower after dehydration by a secondary gas-liquid separator, and then is discharged through a chimney.

[0004] The above equipment and some combined processes currently can achieve desulfurization and denitrification of coal-fired boilers, but still have problems such as general effect and complicated maintenance. Therefore, the applicant has developed a novel desulfurization and denitrification device for coal-fired boilers based on years of work experience and actual needs. SUMMARY

[0005] The purpose of the present application is to provide a novel desulfurization and denitrification device for coal-fired boilers, to improve the treatment effect and reduce the maintenance complexity of the equipment.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme: The utility model provides a new type of desulfurization and denitrification device of coal-fired boiler, including desulfurization storehouse, dust remover and denitration tower which are sequentially arranged, the lower end of desulfurization storehouse leads into flue gas, and the upper portion of denitration tower discharges the flue gas after processing, the inside of desulfurization storehouse is sequentially arranged from bottom to top as air inlet layer, heat exchange layer, spraying layer, the top of desulfurization storehouse is provided with the top cover of conical protrusion, the top end center position of top cover is connected with pipeline to dust remover, and heat exchange layer leads out heat conduction pipe to the flue gas heating layer of denitration tower.

[0007] In some embodiments, a plurality of air pipes are arranged in an array on the bottom plate of the heat exchange layer; the lower end of the air pipe is connected to the air inlet layer, and the upper end is open; the heat exchange layer is filled with heat-conducting oil lower than the height of the air pipe; the heat-conducting oil is submerged with a heat-conducting pipe leading out to the outside.

[0008] In some embodiments, the partition plate between the heat exchange layer and the spraying layer is an open shape with a central upward convergence protrusion; a blocking cap is arranged above the opening; the blocking cap blocks the direct upward flow of flue gas and covers the opening. The connection position of the partition plate and the inner wall of the desulfurization storehouse is arranged in a rounded shape and is provided with an external discharge opening connected to an external discharge pipe.

[0009] In some embodiments, the spraying layer is provided with multiple layers of spraying pipes; each layer of spraying pipe is provided below with multiple rings of spraying nozzles arranged in a surrounding manner and expanding outward downward.

[0010] In some embodiments, each layer of spraying pipe is further provided above with multiple rings of spraying nozzles arranged in a surrounding manner and expanding outward upward.

[0011] In some embodiments, the spraying layer is provided near the top end with a baffle layer; The baffle layer is centrally symmetrically provided with a baffle plate, the top of the baffle plate is inclined toward the center and is provided with an arc-shaped bend; a spray pipe is arranged below the baffle plate, and the spray pipe is provided with a spray head facing the lower surface of the baffle plate.

[0012] In some embodiments, the lower end of the top cover is surrounded by a cooling bin; the center of the cooling bin is provided with a through hole, and the upper top surface is an inclined surface inclined toward the lower end of the center; the top cover is provided with an inlet and outlet opening connected to the cooling bin.

[0013] In some embodiments, the upper portion of the cooling bin is provided with a first inverted cone baffle and a second inverted cone baffle with a gap; a channel is formed between the outer ring of the first inverted cone baffle and the inner wall of the top cover; a channel is formed at the central position of the second inverted cone baffle; the flue gas is folded between the first inverted cone baffle and the second inverted cone baffle; A lower discharge opening is formed at the central position of the first inverted cone baffle; A spraying assembly is arranged at the upper position of the cooling bin and the first inverted cone baffle.

[0014] In some embodiments, the spraying assembly comprises a water spraying opening formed on the top cover, a straight pipe fixed outside the top cover and communicated with the water spraying opening, and a ring pipe connected with the straight pipe through a flange.

[0015] In some embodiments, the top cover is equipped with a split water distribution ring pipe near the top. The split water distribution ring pipe connects the main body part and the top detachable part of the top cover. The lower part of the split water distribution ring pipe protrudes into the inside of the top cover, and the upper and lower parts of the split water distribution ring pipe are respectively provided with butt joint edges.

[0016] In some embodiments, the denitration tower is sequentially provided with a bottom empty layer, a vortex distribution layer and a baffle reaction layer from bottom to top.

[0017] In some embodiments, the vortex distribution layer forms a flow guide space through vortex plates which are open upward and downward, and a plurality of vortex nozzles are arranged in the flow guide space, and the vortex nozzles spray obliquely upward and downward.

[0018] In some embodiments, the baffle reaction layer is provided with a baffle plate group composed of a plurality of baffle plates arranged with gaps and a top spraying pipe.

[0019] Compared with the prior art, the present application provides a new desulfurization and denitration device for a coal-fired boiler, which has the following beneficial effects.

[0020] 1. In the present application, a heat exchange layer is arranged in the desulfurization bin to reduce the temperature of flue gas and supply heat to the outside, a center upward gathering protruding crater-shaped partition plate is arranged to gather flue gas in the lower layer and form a spraying layer bottom surface with a slope, and outer expansion nozzles are arranged above and below the spraying pipe to make the diffusion effect of the spraying layer better and the overall desulfurization effect stronger, and the baffle layer reduces the flow speed of flue gas, improves the dispersion effect, and further reacts.

[0021] 2. In the present application, the top cover and the main body of the desulfurization bin are in a detachable assembly form, which is convenient for opening from the top to maintain the inside, the lower end of the top cover is provided with a cooling bin, flue gas after the baffle layer is gathered to the middle again, further prolonging the flue gas flow path, a spraying assembly is arranged to react with the flue gas again and flush the reactants downward, the spraying assembly comprises a water spraying opening, a straight pipe and a ring pipe, which is convenient for maintenance operation without opening the top cover, a split water distribution ring pipe is designed to connect the main body part and the top detachable part of the top cover, and when maintenance is needed in the top cover, the top detachable part of the top cover can be removed.

[0022] 3、The present application, vortex-shaped flow layer disperses flue gas, and multi-layer reaction; and, can guide flue gas to diffuse to the position far away from the import; also can form certain spiral flow, further strengthen flue gas diffusion effect and increase flow path;Vortex-shaped nozzle sprays obliquely upward and downward, more diffused and reacts with flue gas;Baffle forms greater contact area, longer flow path.

[0023] Other advantages, objects, and features of the present application will be better understood from the following detailed description when taken in conjunction with the drawings, some of which are, of course, of a nature to illustrate rather than to define the application. Those skilled in the art will readily understand from the detailed description how alternative embodiments of the present application can be made and used. Such alternative embodiments need not be described in detail, since those skilled in the art will be able to formulate and set up many embodiments with the knowledge presently possessed by them, or which they will acquire from this disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The structural schematic diagram of the present application.

[0025] Figure 2 The structural schematic diagram of the desulfurization bin.

[0026] Figure 3 The sectional view schematic diagram of the desulfurization bin.

[0027] Figure 4 The sectional view schematic diagram of the desulfurization bin.

[0028] Figure 5 The structural schematic diagram of the present application. Figure 4 The enlarged structural schematic diagram of A in the middle.

[0029] Figure 6 The top sectional view schematic diagram of the heat exchange layer.

[0030] Figure 7 The side sectional view schematic diagram of the heat exchange layer.

[0031] Figure 8 The partial sectional view schematic diagram of the spray layer.

[0032] Figure 9 The front side partial sectional view schematic diagram of the spray layer.

[0033] Figure 10 The structural schematic diagram of the spray pipe.

[0034] Figure 11 The partial sectional view schematic diagram of the spray pipe.

[0035] Figure 12 The partial sectional view schematic diagram of the baffle layer.

[0036] Figure 13 The structural schematic diagram of the baffle layer.

[0037] Figure 14 The front view structural schematic diagram of the baffle layer.

[0038] Figure 15 is a sectional view of the top cover.

[0039] Figure 16 is a sectional front view of the top cover.

[0040] Figure 17 is a schematic view of the separated state of the split water distribution ring.

[0041] Figure 18 is a sectional view of the denitration tower.

[0042] Figure 19 is a sectional view of the vortex flow distribution layer.

[0043] Figure 20 is a schematic view of the partial structure of the baffle reaction layer.

[0044] In the figure: 1, desulfurization bin; 2, dust collector; 3, denitration tower; 31, bottom air layer; 32, vortex flow distribution layer; 33, baffle reaction layer; 321, vortex plate; 322, vortex nozzle; 331, baffle piece; 332, top injection pipe; 4, air inlet layer; 5, heat exchange layer; 51, air passage pipe; 6, spray layer; 61, partition plate; 62, cap; 63, external discharge pipe; 64, spray pipe; 65, nozzle; 66, baffle layer; 67, baffle plate; 671, arc-shaped bending; 672, injection pipe; 7, top cover; 71, cooling bin; 72, first inverted cone baffle; 73, second inverted cone baffle; 721, lower discharge port; 8, split water distribution ring; 81, abutting edge. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application.

[0046] With reference to Figures 1-20 A novel desulfurization and denitration device for a coal-fired boiler includes a desulfurization bin 1, a dust collector 2, and a denitration tower 3 arranged in sequence; the desulfurization bin 1 is connected to the flue gas at the lower end, the flue gas is subjected to a desulfurization process, then enters the dust removal process, and then is connected to the denitration tower 3; after reaction in the denitration tower 3, the treated flue gas is discharged from the top of the denitration tower 3.

[0047] The desulfurization bin 1 is sequentially arranged from bottom to top as an air inlet layer 4, a heat exchange layer 5, and a spray layer 6; the flue gas of the coal-fired boiler is dispersed in the air inlet layer 4 and enters the heat exchange layer 5 upward; part of the heat is absorbed, and the temperature of the flue gas is reduced, and then the flue gas enters the spray layer 6; the flue gas is sprayed multiple times in the spray layer 6 to ensure the desulfurization effect.

[0048] Meanwhile, the top of the desulfurization bin 1 is provided with a top cover 7 with a conical protrusion; the top end of the top cover 7 is connected to a pipeline to the dust collector 2; the flue gas is gathered upward by the top cover 7 and led outwards through the pipeline.

[0049] Preferably, the top cover 7 is detachably assembled with the main body of the desulfurization bin 1 (such as flange ring cooperation bolt assembly), facilitating the opening of the whole from the top and the maintenance of the interior; the pipeline is assembled in the form of flange and can be reliably sealed; as shown in Figure 2 , 3 , the top cover 7 with a conical structure is assembled with the main body of the desulfurization bin 1 by matching the edges of the bolts.

[0050] Optionally, the heat exchange layer 5 leads a heat conduction pipe to a flue gas heat exchanger of the denitration tower 3; the flue gas after desulfurization and denitration is discharged after heat exchange and temperature rise.

[0051] In some embodiments, the gas inlet layer 4 has a cavity shape connected to the heat exchange layer 5; as shown in Figure 7 , the lower part of the gas inlet layer 4 is closed and connected to the flue gas pipeline from the side or the bottom; the top is a top plate that divides the gas inlet layer 4 and the heat exchange layer 5.

[0052] Correspondingly, a plurality of air passing pipes 51 are arranged on the bottom plate of the heat exchange layer 5; the lower end of the air passing pipe 51 is connected to the gas inlet layer 4, and the upper end is open; the heat exchange layer 5 is filled with heat conducting oil not higher than the height of the air passing pipe 51, and the heat conducting oil is submerged with a heat conducting pipe led out to the outside.

[0053] It should be noted that a gap is reserved between the top of the air passing pipe 51 and the top plate; the air passing pipe 51 is uniformly distributed around; the heat conducting pipe forms a circulation to outwardly transport the absorbed heat; the heat exchange layer 5 is provided with an access hole for regular cleaning of the interior and operations such as purification and replacement of the heat conducting oil.

[0054] Preferably, the top of the air passing pipe 51 is provided with a sealing plate corresponding to the opening, forming a closed cavity of the heat conducting oil, which can avoid the pollution of the heat conducting oil by the impurities in the flue gas; a gap is reserved between the sealing plate and the top plate, forming a flue gas passage; the sealing plate and the bottom plate cooperate to form a closed cavity through which the air passing pipe 51 passes, which can fill the heat conducting oil and maintain the cleanliness of the heat conducting oil.

[0055] In some embodiments, the partition plate 61 of the heat exchange layer 5 and the spray layer 6 is an open shape with a central upward gathering protrusion; as shown in Figure 4 , 10 , the partition plate 61 forms a crater shape to gather the flue gas in the lower layer to the middle; and forms a spray layer bottom surface with a slope to facilitate the discharge of the reactants.

[0056] Further, a round cap 62 is arranged above the opening; the horizontal coverage area of the round cap 62 is larger than the opening area, forming reliable and effective coverage; and the central opening has a certain height, avoiding overflow of the slurry into the lower layer.

[0057] As shown in Figure 4 , the round cap 62 blocks the direct upward flow of flue gas and covers the opening and blocks the falling slurry; it can be understood that under the action of the round cap 62, the flue gas forms a dispersed baffle into the spray layer 6, diffuses outward and downward, which can increase the diffusion area.

[0058] Further, the connecting position of the partition plate 61 and the inner wall of the desulfurization bin 1 is arranged in a round shape and an external discharge port is arranged, and an external discharge pipe 63 is connected.

[0059] It can be understood that the round edge can reduce residue and adhesion; the external discharge pipe 63 is arranged to regularly discharge the reactant; the external discharge pipe 63 is provided with an opening and closing structure such as a valve and a sealing plate; preferably, the external discharge pipe 63 is arranged to be inclined to the lower end of the outside, and the discharge is more smooth.

[0060] In addition, the external discharge pipe forms an inlet for feeding auxiliary tools such as a scraper rod inward, which can more conveniently and reliably clean the inside.

[0061] It should be noted that in the spray layer 6, the flue gas reacts with the slurry, and the reactant and the slurry fall on the bottom plate of the spray layer 6; according to the spray parameters, the slurry and the reactant are regularly discharged outward; the discharge speed can also be controlled to form continuous and stable discharge.

[0062] In some embodiments, a plurality of spray pipes 64 are arranged in the spray layer 6; a plurality of rings of nozzles 65 are arranged below each spray pipe 64 and are arranged to outwardly expand downward.

[0063] Generally, no less than three spray pipes 64 are arranged to ensure the effect; as shown in Figure 4 , four spray pipes are arranged; the liquid supply and arrangement of the spray pipes can be arranged in a conventional manner in the field to form stable spraying.

[0064] Further, a plurality of rings of nozzles 65 are arranged above each spray pipe 64 and are arranged to outwardly expand upward; that is to say, each spray pipe 64 sprays upward and downward at the same time, so that the diffusion effect of the spray layer 6 is better and the overall desulfurization effect is stronger.

[0065] In some embodiments, a baffle layer 66 is arranged near the top end in the spray layer 6; the main purpose of the baffle layer 66 is to reduce the flow speed of the flue gas and improve the dispersion effect, and further reaction is performed.

[0066] As shown in Figures 12-14As shown; the baffle layer 66 is symmetrically arranged with multiple baffles 67 at its center; the top of the baffle 67 is inclined towards the center and has an arc-shaped bend 671; when the flue gas flows upward and encounters the baffle 67, it is guided and the flow path is extended; and, due to the blocking effect of the baffle 67, the flow surface of the flue gas is larger; in addition, some of the moisture carried by the flue gas will be blocked by the baffle 67, condense on it, and then drip down.

[0067] Furthermore, a nozzle 672 is arranged below the baffle plate 67, and the nozzle 672 is provided with a nozzle facing the lower surface of the baffle plate 67; when the flue gas passes through, an additional spray is added to further improve the effect.

[0068] like Figure 14 As shown, the jet is directed toward the baffle plate 67 and partially splashed, resulting in greater contact with the flue gas; and some of the reaction products fall onto the upper or lower surface of the baffle plate 67 and are then washed down.

[0069] It should be noted that the baffle layer 66 can be set as one or more layers; it can also be formed as follows: the baffle layer 66 and the spray pipe 64 are arranged in multiple layers (that is, one layer of spray pipe 64, one layer of baffle layer 66, another layer of spray pipe 64, and another layer of baffle layer 66, set as multiple layers in combination).

[0070] In some embodiments, a cooling chamber 71 is provided around the lower end of the top cover 7; an opening is provided in the center of the cooling chamber 71, and the upper top surface is an inclined surface sloping towards the lower end of the center; an inlet and outlet are provided on the top cover 7 communicating with the cooling chamber 71.

[0071] like Figure 4 As shown, the flue gas after passing through the baffle layer 66 is once again gathered towards the center, further extending the flow path of part of the flue gas; at the same time, when the flue gas encounters the bottom surface of the cooling chamber 71, it is affected by the lower temperature and forms condensation.

[0072] Preferably, the bottom surface of the cooling chamber 71 is a plane, and the cooling liquid to be cooled is circulated into the cooling chamber 71.

[0073] like Figure 15 As shown; the vertical cross-section of the cooling chamber 71 gradually narrows towards the middle, giving it an expanded surface area; after passing through the inlet, the flue gas diffuses upwards and outwards, contacting the upper surface of the cooling chamber 71 again.

[0074] In some embodiments, a first inverted cone baffle 72 and a second inverted cone baffle 73 are provided above the cooling chamber 71 with a gap; a channel is formed between the outer ring of the first inverted cone baffle 72 and the inner wall of the top cover 7; a channel is formed at the center of the second inverted cone baffle 73; the flue gas is deflected between the first inverted cone baffle 72 and the second inverted cone baffle 73; the flow path is further lengthened.

[0075] It can be understood that the flue gas diffuses outward and upward after passing through the opening of the cooling bin 71, and then gathers in the middle position after passing through the passage of the outer ring of the first inverted cone baffle 72, and then passes through the central passage of the second inverted cone baffle 73 upward.

[0076] In some embodiments, a spraying assembly is arranged at the upper position of the cooling bin 71 and the first inverted cone baffle 72; the spraying assembly reacts with the passing flue gas again and sprays the reactant downward.

[0077] It should be noted that the central position of the first inverted cone baffle 72 is provided with a lower discharge port 721 to form a downward flow channel.

[0078] In some embodiments, the spraying assembly comprises a plurality of water spraying ports arranged around the top cover 7, a straight pipe fixed outside the top cover 7 and communicated with the water spraying ports, and a ring pipe connected with the straight pipe through a flange.

[0079] Such an arrangement is convenient for maintenance; when partial blockage occurs, the ring pipe can be removed to clean and dredge the water spraying ports without opening the top cover 7.

[0080] It should be noted that the straight pipe can be directly communicated with the water spraying port to spray inward from the water spraying port, or a nozzle is arranged at the lower end of the straight pipe to insert and penetrate the water spraying port to spray inward from the nozzle. Correspondingly, when spraying inward from the water spraying port, the lower end of the straight pipe can be directly welded on the top cover 7 or assembled on the top cover 7 through the flange; when designing the nozzle, the straight pipe is assembled on the top cover 7 through the flange to facilitate dismounting the straight pipe and taking out the nozzle.

[0081] In some embodiments, the top cover 7 is provided, near the top, with a split water distribution ring pipe 8.

[0082] As shown in FIGS. Figure 5 , 16 , and 17, the split water distribution ring pipe 8 connects the main body part and the top dismounting part of the top cover 7; when the split water distribution ring pipe 8 is dismounted, the top dismounting part can be completely removed.

[0083] As shown in FIGS. Figure 5 , the lower part of the split water distribution ring pipe 8 protrudes into the inside of the top cover 7; the upper and lower parts of the split water distribution ring pipe 8 are respectively provided with abutting edges 81; preferably, the outer surface of the top cover 7 is provided, corresponding to the abutting edges 81, with grooves, and the abutting edges 81 are clamped into the grooves.

[0084] During installation, first, the top dismounting part is placed in position (external force is needed); then, the split water distribution ring pipe 8 is clamped into the gap between the main body part and the top dismounting part of the top cover 7; then, bolts are assembled to connect the main body part and the top dismounting part of the top cover 7 through the split water distribution ring pipe 8.

[0085] It should be noted that the lower part of the split water distribution ring pipe 8 is provided with a spray port; during routine maintenance, the upper part of the split water distribution ring pipe 8 is removed (a small part is connected with the top cover 7), and the internal spray port can be cleaned; when the top cover 7 needs to be maintained, the top cover 7 can be removed.

[0086] In some embodiments, the denitration tower 3 is sequentially provided with a bottom empty layer 31, a vortex distribution layer 32, and a baffle reaction layer 33 from bottom to top; the flue gas after the dust removal process (preferably using wet electric dust removal) enters the SCR denitration operation.

[0087] Among them, the bottom empty layer 31 raises the denitration tower 3, the vortex distribution layer 32 disperses the flue gas and reacts in multiple layers; the flue gas is reacted again in the baffle reaction layer 33; then, the flue gas is discharged after being heated (by the heat energy transferred by the heat exchange layer 5).

[0088] As shown in Figure 18 , 19 , the vortex distribution layer 32 forms a flow guide space through the vortex plate 321 which is open upward and downward, and the flue gas is dispersed. It can be understood that the pipeline for entering the flue gas must be smaller than the internal space size of the denitration tower 3, and the entering flue gas will not be uniform (more upward flow near the inlet position); correspondingly, the vortex plate on the side where the flue gas enters is arranged to be smaller in interval, which can guide more flue gas to diffuse away from the inlet; and the vortex plate 321 is a connected flow guide space, which can also form a certain spiral flow under the initial flow direction of the entering flue gas, further strengthening the flue gas diffusion effect and increasing the flow path.

[0089] In addition, a plurality of vortex nozzles 322 are arranged in the flow guide space; the vortex nozzles 322 are open upward and downward, and are obliquely injected upward and downward, which further disperses the flue gas and reacts with the flue gas.

[0090] Preferably, the main conveying pipe is arranged in the center of the bottom empty layer 31 and extends upward, and the vortex nozzles 322 are connected to the main conveying pipe to provide supply.

[0091] In some embodiments, the baffle reaction layer 33 is provided with a baffle piece group composed of a plurality of baffle pieces 331 arranged by a plurality of gaps and a top injection pipe 332; the baffle pieces 331 form a larger contact area and a longer flow path, and the top injection pipe 332 sprays toward the baffle pieces 331, which is better for reaction.

[0092] For the flue gas heat exchanger of the denitration tower 3, a suitable form can be used; and it is not necessary.

[0093] When the device is used, the flue gas of coal-fired boiler is introduced into the device, gathered in the air inlet layer 4, and enters the heat exchange layer 5 through the air pipe 51, the flue gas is absorbed part of the heat and guided to the outside for use, then the flue gas is gathered through the crater-shaped partition plate 61, and enters the spray layer 6 under the dispersion of the baffle cap 62, is sprayed by the spray pipe 64 arranged in the spray layer 6 for multiple times, and the desulfurization effect is ensured, the formed reactant and slurry are discharged through the discharge pipe 63, the flue gas continues to rise, is guided in the baffle layer 66, the flow path is prolonged, a spray is added, and the effect is further improved, then the flue gas reaches the top cover 7, is cooled first, is gathered, diffused and sprayed again multiple times, and finally is guided to the dust collector 2 from the top, the flue gas after dust removal enters the denitration tower 3, the flue gas is dispersed in the vortex-shaped flow dividing layer 32, and multi-layer reaction is carried out, and the flue gas is reacted again in the baffle reaction layer 33.

[0094] In the present application, the heat exchange layer 5 is arranged in the desulfurization bin 1 to reduce the temperature of the flue gas and supply heat to the outside; the array of gas pipes 51 is matched with the heat conducting oil and heat conducting pipes to lead out heat; the crater-shaped partition plate 61 is arranged to gather the flue gas in the lower layer and form a spraying layer bottom surface with a slope to facilitate the discharge of the reactants; the cap 62 is arranged to cover the opening to prevent the slurry from falling or overflowing to the lower layer; and the cap 62 blocks the flue gas to form a dispersed baffle to the outside to increase the diffusion area; the outer discharge pipe 63 is arranged to be inclined to the lower end of the outside to discharge the material more smoothly; and other tools can be matched to make the cleaning and other operations inside more convenient and reliable; the outer expansion nozzles are arranged above and below the spraying pipe 64 to make the diffusion effect of the spraying layer 6 better and the overall desulfurization effect stronger; the baffle layer 66 is arranged close to the top end to reduce the flow speed of the flue gas, improve the dispersion effect, and further react; the spray pipe 672 is arranged below the baffle plate 67 to increase a spraying layer and further improve the effect; and part of the reaction products fall on the upper surface or lower surface of the baffle plate 67 and are flushed down; the top cover 7 is detachably assembled with the main body of the desulfurization bin 1 to facilitate the opening of the top to maintain the inside; the cooling bin 71 is arranged at the lower end of the top cover 7, the flue gas after the baffle layer 66 is gathered to the middle again to further lengthen the flow path of the flue gas; at the same time, the flue gas is condensed due to the influence of the lower temperature; the vertical section of the cooling bin 71 gradually decreases to the middle to have an expanded surface area, and the flue gas contacts the upper surface of the cooling bin 71 again; the flue gas is turned back between the first inverted cone baffle 72 and the second inverted cone baffle 73; the flow path is further lengthened; the spraying assembly is arranged to react with the flue gas again and flush the reactants downward; the spraying assembly includes a water spraying port, a straight pipe, and a ring pipe to facilitate the maintenance operation without opening the top cover 7; the split type water distribution ring pipe 8 is designed to connect the main body part and the top detachable part of the top cover 7; when the inside of the top cover 7 needs to be maintained, the top detachable part of the top cover 7 can be removed; the vortex flow layer 32 disperses the flue gas and reacts in multiple layers; and the flue gas can be guided to diffuse to a position away from the inlet; a certain spiral flow can also be formed to further strengthen the flue gas diffusion effect and increase the flow path; the vortex spray pipe 322 is obliquely sprayed upward and downward to further diffuse and react with the flue gas; and the baffle piece 331 forms a larger contact area and a longer flow path.

[0095] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical solutions and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

[0096] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0097] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A novel desulfurization and denitrification device for coal-fired boilers, comprising a desulfurization bin (1), a dust collector (2) and a denitrification tower (3) arranged in sequence; the lower end of the desulfurization bin (1) is connected to flue gas, and the denitrification tower (3) is connected to flue gas after treatment at the top; characterized in that, The desulfurization bin (1) is sequentially provided from bottom to top with an air inlet layer (4), a heat exchange layer (5) and a spraying layer (6), and the top of the desulfurization bin (1) is provided with a top cover (7) with a conical protrusion; the top end of the top cover (7) is connected to a duct to a dust collector (2); the heat exchange layer (5) leads a heat conducting pipe to a flue gas heating layer of a denitration tower (3).

2. The coal-fired boiler novel desulfurization and denitrification device according to claim 1, characterized in that, A plurality of air passing pipes (51) are arranged in an array on the bottom plate of the heat exchange layer (5); the lower end of the air passing pipe (51) is connected to the air inlet layer (4), and the upper end is open; the heat exchange layer (5) is filled with heat conducting oil lower than the height of the air passing pipe (51), and a heat conducting pipe leading to the outside is submerged in the heat conducting oil.

3. The coal-fired boiler novel desulfurization and denitrification device according to claim 1, characterized in that, The partition plate (61) between the heat exchange layer (5) and the spraying layer (6) is in an open shape with a central upward convergence protrusion; a baffle cap (62) is arranged above the opening; the baffle cap (62) blocks the direct upward flow of flue gas and covers the opening; The connection position between the partition plate (61) and the inner wall of the desulfurization bin (1) is in a round corner shape and is provided with an external discharge opening and a connection external discharge pipe (63).

4. The coal-fired boiler novel desulfurization and denitrification device according to claim 1, characterized in that, A baffle layer (66) is arranged near the top end in the spraying layer (6); The baffle layer (66) is centrally symmetrically provided with a baffle plate (67), the top of the baffle plate (67) is inclined towards the center, and is provided with an arc-shaped bend (671); a spray pipe (672) is arranged below the baffle plate (67), and the spray pipe (672) is provided with a spray head towards the lower surface of the baffle plate (67).

5. The coal-fired boiler novel desulfurization and denitrification device according to claim 1, characterized in that, The lower end of the top cover (7) is surrounded by a cooling bin (71); the center of the cooling bin (71) is provided with an opening, and the upper top surface is an inclined surface inclined towards the lower end of the center; the top cover (7) is provided with an inlet and outlet opening communicating with the cooling bin (71).

6. The coal-fired boiler novel desulfurization and denitrification device according to claim 5, characterized in that, The upper part of the cooling bin (71) is provided with a first inverted cone baffle (72) and a second inverted cone baffle (73) with a gap reserved therebetween; a channel is formed between the first inverted cone baffle (72) and the inner wall of the top cover (7); a channel is formed at the central position of the second inverted cone baffle (73); the flue gas is folded between the first inverted cone baffle (72) and the second inverted cone baffle (73); A lower discharge opening (721) is formed at the central position of the first inverted cone baffle (72); A spraying assembly is arranged at the upper position of the cooling bin (71) and the first inverted cone baffle (72).

7. The coal-fired boiler novel desulfurization and denitrification device according to claim 6, characterized in that, The spraying assembly comprises a water spraying opening formed in the top cover (7), a straight pipe fixed to the outside of the top cover (7) and connected to the water spraying opening, and a ring pipe connected to the straight pipe through a flange.

8. The coal-fired boiler novel desulfurization and denitrification device according to claim 1, characterized in that, A split water distribution ring pipe (8) is assembled at a position close to the top of the top cover (7); The split water distribution ring pipe (8) connects the main body part and the top detachable part of the top cover (7); The lower part of the split water distribution ring pipe (8) protrudes into the inside of the top cover (7); the upper and lower parts of the split water distribution ring pipe (8) are respectively provided with a butt joint edge (81).

9. The coal-fired boiler novel desulfurization and denitrification device according to claim 1, characterized in that, The denitration tower (3) is sequentially provided from bottom to top with a bottom empty layer (31), a vortex flow splitting layer (32) and a baffle reaction layer (33).

10. The coal-fired boiler novel desulfurization and denitrification device according to claim 9, characterized in that, The vortex-shaped shunt layer (32) is formed by the vortex-shaped plate (321) which is open upward and downward to form a flow guiding space; a plurality of vortex-shaped nozzles (322) are arranged in the flow guiding space; the vortex-shaped nozzles (322) spray obliquely upward and downward.

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