Liquid desulfurization device applied to cement kiln

Abstract

The utility model discloses a liquid desulfurization device applied to a cement kiln. The liquid desulfurization device comprises a multi-stage cyclone preheater, flue pipes are arranged between the cyclone preheaters in a communicating mode. The device further comprises a decomposing furnace and a rotary kiln; the bottom of the decomposing furnace is communicated with the rotary kiln through a pipeline; the top of the decomposing furnace is communicated with the position, close to the top edge, of the outer side of the C5 cyclone preheater through a pipeline; according to preheaters of different specifications, spraying points are selected differentially, C2-C1 inter-stage flue pipes are selected for the fifth-stage preheater, C3-C2 inter-stage flue pipes are arranged for the sixth-stage preheater, more stages of preheaters are arranged in the same manner, and it is ensured that the temperature of a reaction area is accurately controlled to be at an optimal reaction window of 300-600 DEG C. According to engineering verification, the process can stably reduce the flue gas concentration to be below 35mg / m, maximization of the medicament utilization rate is realized while up-to-standard emission is ensured, the consumption of a desulfurizing agent is reduced by 15-20% compared with that of a conventional method, and the process has both environmental benefits and economic benefits.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the flue gas desulfurization technical field, specifically, relate to a kind of liquid desulfurization device applied to cement kiln. BACKGROUND

[0002] In the heavy industrial field such as thermal power generation, metal mining, petroleum chemical industry, cement production, steel and metallurgical production, flue gas containing sulfide is generally generated, in order to protect the environment, the generated flue gas needs to be treated by desulfurization before being discharged to the outside through chimney, so as to avoid the pollution of flue gas to the atmosphere, among them, liquid desulfurizer is more and more used due to the advantages of convenient setting, low equipment cost, sufficient reaction and the like.

[0003] At present, the main factors affecting the desulfurization efficiency of cement kiln liquid desulfurization technology are temperature, high temperature leading to rapid evaporation of desulfurizer (such as ammonia desulfurization), low temperature reducing reaction rate (such as limestone method); injection uniformity, traditional spray gun has poor atomization effect, droplet size distribution is uneven, leading to local supersaturation or insufficient reaction; flue gas concentration , high concentration (cement kiln flue gas accounts for 20%~30%) and side reaction (formation ) with alkaline desulfurizer, reducing the utilization rate of effective components, and desulfurizer efficiency and reaction time, etc.

[0004] In view of the above problems, the utility model aims at providing a kind of liquid desulfurization equipment applied to cement kiln, to solve the problem of excessive emission of cement manufacturing equipment in cement production process in prior art , not only can make the emission flue gas reach the emission standard, but also can reduce the use cost of desulfurizer. UTILITY MODEL CONTENT

[0005] To solve the technical problem of excessive emission of cement manufacturing equipment in cement production process in prior art , the utility model provides a kind of liquid desulfurization device applied to cement kiln.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] The utility model relates to a liquid desulfurization device applied to cement kiln, including multistage cyclone preheater, the cyclone preheater between all linkages are provided with flue pipe, still include decomposing furnace and rotary kiln, the bottom of decomposing furnace and rotary kiln pass through pipeline intercommunication, the top of decomposing furnace is connected with the position of cyclone preheater's outside near the top edge at C5 through pipeline, the bottom of cyclone preheater at C4 is connected with rotary kiln input end through pipeline, the flue pipe between cyclone preheater at C1 and cyclone preheater at C2 is fixedly connected with the communication feed pipe, the lower end of cyclone preheater all is fixedly connected with the communication downcomer, the flue pipe between cyclone preheater at C1 and cyclone preheater at C2 is fixedly connected with liquid injection assembly, the liquid injection assembly includes shower nozzle, the shower nozzle is provided with a plurality, and the shower nozzle sprays desulfurizer in atomized state to the inside of flue pipe.

[0008] Further, the liquid injection assembly further includes a rectangular frame in communication with the flue pipe, the rectangular frame is longitudinally arranged; the shower nozzles are longitudinally and evenly arranged inside the rectangular frame; the input ends of the shower nozzles are jointly connected to a hose.

[0009] Further, the shower nozzles are fixedly connected with hinge rods arranged symmetrically, the two ends of the hinge rods are rotationally connected to the rectangular frame.

[0010] Further, the hinge rods are fixedly connected with driven gears; a vertical stand is arranged in the rectangular frame to move vertically, the upper end of the vertical stand penetrates into the upper part of the rectangular frame; the vertical stand is fixedly connected with first meshing teeth at positions corresponding to the driven gears, the first meshing teeth are respectively in meshing transmission with the corresponding driven gears.

[0011] Further, the vertical stand is fixedly connected with second meshing teeth at positions corresponding to the upper part of the rectangular frame; a motor is fixedly arranged at the upper part of the rectangular frame; the motor is fixedly connected with a driving gear at the output end, the driving gear is in meshing transmission with the second meshing teeth.

[0012] Further, a sealing plate is fixedly connected to the rectangular frame by screws; a limiting convex edge is fixedly connected to the sealing plate at a position close to the vertical stand, the limiting convex edge is in close contact with the vertical stand.

[0013] Further, a limiting groove is formed in one side of the limiting convex edge close to the vertical stand; a limiting block is fixedly connected to the vertical stand at a position corresponding to the limiting groove, the limiting block is slidingly arranged in the limiting groove, and the maximum distance of the limiting block sliding in the limiting groove is the length of the first meshing teeth.

[0014] Further, the liquid injection assembly further includes a fixing ring fixedly connected to the flue pipe; a plurality of fixing blocks in circumferential array are fixedly connected to the fixing ring; a socket penetrating into the inside of the flue pipe is formed in the fixing block; the shower nozzles are arranged in the socket; the input ends of the shower nozzles are jointly connected to a ring-shaped pipe; a hose is in communication with the ring-shaped pipe.

[0015] The utility model discloses the following beneficial effects:

[0016] 1) The utility model discloses a multistage centrifugal pump is used to the liquid desulfurizer from water agent storage tank steady delivery to atomization injection system, realizes the efficient atomization of reagent through special nozzle. For different specifications of preheater, the injection point is differentiated and selected;The C2-C1 stage interflue pipe is selected for five-stage preheater, and the C3-C2 stage interflue pipe is set for six-stage preheater, and more stage preheater is set in this way, ensure that the reaction zone temperature is accurately controlled in the optimum reaction window of 300 DEG C-600 DEG C;Process control requires that the desulfurizer addition amount is strictly limited to within 2t / h, and through the full contact of atomization droplet and sulfur-containing flue gas, neutralization reaction generates sulfite / sulfate compound;Through engineering verification, the process can make the flue gas concentration stablely reduced to below 35mg / m³, while ensuring the standard discharge, realizes the maximum utilization of reagent, reduces 15%~20% of desulfurizer consumption compared with conventional method, and has environmental benefits and economic benefits.

[0017] 2) The utility model discloses through adjusting the nozzle angle can make the desulfurizer droplet spread in the flue pipe along the predetermined direction, improves the distribution uniformity of droplet in the flue gas, and reasonable injection angle can cover greater area in the flue pipe, avoids the reaction insufficient caused by local droplet concentration is too high or too low, thereby ensuring that the whole flue pipe cross section is fully treated, thereby adapting to different working conditions;In addition, by adjusting the injection angle of nozzle, it is helpful to make the droplet and flue gas form suitable collision and mixing state, enhance the gas-liquid contact efficiency, and the more appropriate injection angle can make the droplet quickly enter the flue gas mainstream, accelerate the desulfurization reaction rate, shorten the distance and time error of droplet and gas contact, thereby realizing faster neutralization reaction. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be needed to use the drawing of the embodiment to introduce briefly, obviously, the drawing in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0019] Figure 1 It is the overall structure schematic diagram of the embodiment one of the utility model;

[0020] Figure 2 It is Figure 1 The local enlarged schematic diagram of A in;

[0021] Figure 3 It is the section view of the embodiment one of the utility model;

[0022] Figure 4 It is Figure 3 The local enlarged schematic diagram of B in;

[0023] Figure 5 is a structure diagram of the spray head in the embodiment one of the utility model;

[0024] Figure 6 is a structure diagram of the limiting convex edge in the embodiment one of the utility model;

[0025] Figure 7 is Figure 6 is a partial enlarged diagram of C in the middle;

[0026] Figure 8 is a flue pipe structure diagram of the embodiment two of the utility model;

[0027] Figure 9 is Figure 8 is a partial enlarged diagram of D in the middle;

[0028] Figure 10 is a sectional view of the embodiment two of the utility model;

[0029] Figure 11 is Figure 10 is a partial enlarged diagram of E in the middle;

[0030] In the drawings, the component list represented by each sign is as follows:

[0031] 1, cyclone preheater; 2, flue pipe; 3, rectangular frame; 4, spray head; 5, hinged rod; 6, driven gear; 7, vertical plate; 8, first meshing tooth; 9, motor; 10, driving gear; 11, second meshing tooth; 12, sealing plate; 13, limiting convex edge; 14, limiting groove; 15, limiting block; 16, fixed ring; 17, fixed block; 18, socket; 19, blanking pipe; 20, decomposing furnace; 21, rotary kiln; 22, hose; 23, annular pipe; 24, feed pipe. DETAILED DESCRIPTION

[0032] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model. Embodiment one

[0033] Please refer to Figure 1 and Figure 3 As shown in the figure, a liquid desulfurization device applied to a cement kiln comprises multiple-stage cyclone preheaters 1 (five stages are arranged in the embodiment, such as Figure 2The shown C1-C5) ; between the cyclone preheater 1 is communicated with flue pipe 2, cyclone preheater 1 by centrifugal force separates raw material and waste gas, ensure that raw material is collected and transported down, waste gas flows upward; also includes decomposing furnace 20 and rotary kiln 21, decomposing furnace 20 is used for raw material preheating and carbonate decomposition, rotary kiln 21 is used for sintering raw material into mature material after preheating and pre-decomposition; decomposing furnace 20 bottom and rotary kiln 21 are communicated by pipeline; the top of decomposing furnace 20 is communicated with the position of the outer side of cyclone preheater 1 at C5 and near the top edge through pipeline; the bottom of cyclone preheater 1 at C4 is communicated with the input end of rotary kiln 21 through pipeline; the bottom of flue pipe 2 between cyclone preheater 11 at C1 and cyclone preheater 1 at C2 is fixedly connected with feed pipe 24; the lower end of cyclone preheater 1 is fixedly connected with the communicated discharge pipe 19.

[0034] Please refer again to Figures 1-5 The shown, C1 cyclone preheater 1 and C2 cyclone preheater 1 between the flue pipe 2 is fixedly connected with the communicated rectangular frame 3, the rectangular frame 3 is longitudinally arranged; the rectangular frame 3 is longitudinally arranged with evenly distributed spray head 4; the spray head 4 input end is commonly connected with a hose 22, the hose 22 is transported to the inside of the spray head 4 from the water agent storage tank by multistage centrifugal pump; the spray head 4 is fixedly connected with the symmetrically arranged hinged rod 5, the hinged rod 5 both ends are rotatably connected with the rectangular frame 3.

[0035] Please refer again to Figure 5 The shown, the hinged rod 5 is fixedly connected with driven gear 6; the rectangular frame 3 is provided with vertical moving vertical plate 7, the vertical plate 7 upper end penetrates to the upper part of the rectangular frame 3; the vertical plate 7 is fixedly connected with first meshing tooth 8 corresponding to the position of driven gear 6, the first meshing tooth 8 is respectively engaged with corresponding driven gear 6.

[0036] Please refer again to Figure 2 , Figure 6 And Figure 7 The shown, the vertical plate 7 is fixedly connected with second meshing tooth 11 corresponding to the position of the upper part of the rectangular frame 3; the rectangular frame 3 upper part is fixedly provided with motor 9; the motor 9 output end is fixedly connected with driving gear 10, the driving gear 10 is engaged with second meshing tooth 11, for driving vertical plate 7 to move vertically in the rectangular frame 3.

[0037] Please refer again to Figure 6 And Figure 7 The shown, the rectangular frame 3 is fixedly connected with sealing plate 12 through screw; the sealing plate 12 is fixedly connected with limiting convex edge 13 near the position of vertical plate 7, the limiting convex edge 13 and vertical plate 7 are mutually attached; the limiting convex edge 13 is provided with limiting groove 14 on the side near the vertical plate 7; the vertical plate 7 is fixedly connected with limiting block 15 corresponding to the position of limiting groove 14, the limiting block 15 is slidingly arranged in the limiting groove 14, and the maximum distance of the limiting block 15 sliding in the limiting groove 14 is the length of the first meshing tooth 8.

[0038] In order to facilitate the understanding of the above technical scheme of the utility model, the working principle or operation mode of the utility model in the actual process is explained in detail as follows:

[0039] The liquid desulfurizer is stably transported from the water agent storage tank to the atomizing nozzle 4 by the multistage centrifugal pump and the hose 22, and the special nozzle 4 is used to realize efficient atomization of the agent. For different specifications of the preheater, the injection points are differentiated: the C2-C1 stage inter-tube 2 is selected for the five-stage preheater, the C3-C2 stage inter-tube 2 is selected for the six-stage preheater, and more stages of the preheater are set in this way, so as to ensure that the reaction zone temperature is accurately controlled in the best reaction window of 300-600 DEG C. The process control requires that the desulfurizer addition amount is strictly limited to less than 2 t / h, and through the full contact of the atomized droplets with the sulfur-containing flue gas, a neutralization reaction is generated to generate sulfite / sulfate compounds. Through engineering verification, the process can make the flue gas concentration stably reduced to below 35 mg / m³, while ensuring that the standard is discharged, the agent utilization rate is maximized, the desulfurizer consumption is reduced by 15%-20% compared with the conventional method, and environmental and economic benefits are achieved.

[0040] The flow path of the flue gas is as follows:

[0041] The air outlet pipeline at the top of the decomposition furnace 20 is in communication with the top side of the cyclone preheater 1 at C5, so that the high-temperature flue gas enters the interior of the cyclone preheater 1 at C5. The cyclone preheater 1 has the function of separating gas flow and material. The gas flow enters the C5-C4 stage flue pipe 2 from the gas outlet at the upper end of the cyclone separator at C5, and then enters the cyclone separator at C4, while the material is discharged from the material outlet at the lower end of the cyclone separator. Specifically, the flue gas in the cyclone separator of the upper stage enters the cyclone separator of the lower stage from the flue pipe 2, and is finally discharged from the gas outlet of the cyclone preheater 1 at C1.

[0042] The flow path of the material is as follows:

[0043] The lower end of the flue pipe 2 at C2-C1 is communicated with a feeding pipe 24, and the material is fed into the flue pipe 2 at C2-C1 from the feeding pipe 24, and is entrained by the upward flue gas flow into the inside of the cyclone preheater 1 at C1, and the material is fed into the flue pipe 2 at C3-C2 from the lower discharge pipe 19 by the centrifugal action of the cyclone separator at C1, and is again entrained by the upward flue gas flow into the inside of the cyclone preheater 1 at C2, and so on, so that the material is heat-exchanged with the flue gas, and finally is fed into the decomposing furnace 20 from the lower discharge pipe 19 at the lower end of the cyclone preheater 1 at C4, and is decomposed into CaO, Fe2O3, Al2O3 and the like in the environment of about 1000 DEG C in the decomposing furnace 20, and is fed into the inside of the cyclone preheater 1 at C5 from the air outlet pipe of the decomposing furnace 20, and is finally discharged from the discharge port of the cyclone preheater 1 at C5 into the lower discharge pipe 19, and flows to the cement kiln through the three-way valve.

[0044] Wherein, the vertical movement of the vertical plate 7 can be driven by the cooperation of the motor 9, the driving gear 10 and the second meshing gear 11, and the vertical plate 7 drives the driven gear 6 to rotate through the first meshing gear 8, and the driven gear 6 is fixedly connected with the hinged rod 5, and the hinged rod 5 is connected with the nozzle 4, so that the angle of the nozzle 4 can be automatically adjusted by the motor 9;

[0045] By adjusting the angle of the nozzle 4, the droplets of the desulfurizing agent can be diffused in the flue pipe 2 along the predetermined direction, and the uniformity of the distribution of the droplets in the flue gas can be improved, and a reasonable injection angle can cover a larger area in the flue pipe 2, so as to avoid the insufficient reaction caused by the local droplet concentration being too high or too low, thereby ensuring that the whole cross section of the flue pipe 2 is fully treated, so as to adapt to different working conditions; in addition, by adjusting the injection angle of the nozzle 4, the droplets and the flue gas can form a suitable collision and mixing state, the gas-liquid contact efficiency is enhanced, and a more appropriate injection angle can promote the droplets to quickly enter the main flow of the flue gas, accelerate the desulfurization reaction rate, shorten the distance and time error of the droplets and the gas contact, so as to realize faster neutralization reaction.

[0046] Wherein, the setting of the limiting convex edge 13 on the sealing plate 12 can limit the fitting of the vertical plate 7 after the sealing plate 12 is assembled, so as to ensure that the first meshing gear 8 on the vertical plate 7 is always engaged with the corresponding driven gear 6; by the cooperation of the limiting convex block and the limiting groove 14, the front and rear positions of the vertical plate 7 can be limited after the sealing plate 12 is assembled, so as to avoid the first meshing gear 8 and the driven gear 6 losing cooperation, and by the above-mentioned limiting convex edge 13, limiting block 15 and limiting groove 14, the adjustment effect of the motor 9 on the nozzle 4 is ensured, and the desulfurization effect of the flue gas under different working conditions is ensured. Example two

[0047] Please refer to Figure 8 - Figure 11As shown, the utility model relates to a liquid desulfurization device applied to a cement kiln, and the embodiment and the embodiment one are basically same in structure, and the difference lies in that in the embodiment, a fixing ring 16 is fixedly connected on the flue pipe 2 between the cyclone preheater 1 at C1 and the cyclone preheater 1 at C2, a plurality of fixing blocks 17 in circumferential array are fixedly connected on the fixing ring 16 (five fixing blocks 17 are arranged in the embodiment), a socket 18 penetrating to the inside of the flue pipe 2 is formed on the fixing block 17, the fixing block 17 is provided with a spray head 4 corresponding to the position inside the socket 18, the input ends of the spray heads 4 are commonly connected with a ring pipe 23, and a hose 22 is communicated on the ring pipe 23.

[0048] A fixing ring 16 is fixedly connected on the flue pipe 2 between the cyclone preheater 1 at C1 and the cyclone preheater 1 at C2; a plurality of fixing blocks 17 in circumferential array are fixedly connected on the fixing ring 16 (five fixing blocks 17 are arranged in the embodiment); a socket 18 penetrating to the inside of the flue pipe 2 is formed on the fixing block 17; the fixing block 17 is provided with a spray head 4 corresponding to the position inside the socket 18; the input ends of the spray heads 4 are commonly connected with a ring pipe 23; and a hose 22 is communicated on the ring pipe 23.

[0049] In the specific work, the liquid desulfurizer is stably conveyed from the water agent storage tank to the atomizing spray head 4 through the multistage centrifugal pump, the hose 22 and the ring pipe 23, and the high-efficiency atomization of the medicament is realized through the special spray head 4, and different from the embodiment one, the spray head 4 is arranged on a circle of the flue pipe 2 in the embodiment, so that even if the diameter of the flue pipe 2 is large, the flue gas passing through the inside of the flue pipe 2 can be completely desulfurized, and the omnibearing desulfurization effect on the flue gas is realized.

[0050] In the description of the specification, the description of the reference terms "one embodiment", "example", "specific example" and the like 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 utility model. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable way.

[0051] The above content is only an example and description of the structure of the utility model, and the skilled in the art can make various modifications or supplements or replace with similar ways to the described specific embodiments, as long as the structure of the utility model or beyond the scope defined by the patent claim, should belong to the protection scope of the utility model.

Claims

1. A liquid desulfurization device applied to a cement kiln, comprising a plurality of cyclone preheaters (1); flue pipes (2) are arranged in communication between the cyclone preheaters (1); further comprising a decomposing furnace (20) and a rotary kiln (21); characterized in that: the bottom of the decomposing furnace (20) is communicated with the rotary kiln (21) through a pipeline; the top of the decomposing furnace (20) is communicated with the position close to the top edge of the outer side of the cyclone preheater (1) at C5 through a pipeline; the bottom of the cyclone preheater (1) at C4 is communicated with the input end of the rotary kiln (21) through a pipeline; a feeding pipe (24) is fixedly connected in communication at the bottom of the flue pipe (2) between the cyclone preheater (1) at C1 and the cyclone preheater (1) at C2; a discharging pipe (19) is fixedly connected in communication at the lower end of the cyclone preheater (1); a liquid injection assembly is fixedly connected on the flue pipe (2) between the cyclone preheater (1) at C1 and the cyclone preheater (1) at C2; the liquid injection assembly comprises a plurality of nozzles (4), and the nozzles (4) spray desulfurizing agents in an atomized state into the interior of the flue pipe (2).

2. A liquid desulphurization device for use in a cement kiln according to claim 1, characterized in that: the liquid injection assembly further comprises a rectangular frame (3) in communication with the flue pipe, the rectangular frame (3) is arranged longitudinally; the nozzles (4) are arranged longitudinally and uniformly in the interior of the rectangular frame (3); the input ends of the nozzles (4) are connected to a hose (22) in common.

3. A liquid desulphurization device for a cement kiln according to claim 2, characterized in that: hinged rods (5) are fixedly connected on the nozzles (4) and arranged symmetrically, the two ends of the hinged rods (5) are rotatably connected to the rectangular frame (3).

4. A liquid desulphurization device for a cement kiln according to claim 3, characterized in that: driven gears (6) are fixedly connected on the hinged rods (5); a vertical moving vertical plate (7) is arranged in the rectangular frame (3), the upper end of the vertical plate (7) penetrates into the upper part of the rectangular frame (3); first meshing teeth (8) are fixedly connected to the vertical plate (7) at positions corresponding to the driven gears (6), the first meshing teeth (8) are respectively in meshing transmission with the corresponding driven gears (6).

5. A liquid desulphurization device for use in a cement kiln according to claim 4, characterized in that: second meshing teeth (11) are fixedly connected to the vertical plate (7) at positions corresponding to the upper part of the rectangular frame (3); a motor (9) is fixedly arranged on the upper part of the rectangular frame (3); a driving gear (10) is fixedly connected to the output end of the motor (9), the driving gear (10) is in meshing transmission with the second meshing teeth (11).

6. A liquid desulphurization device for use in a cement kiln according to claim 2, characterized in that: a sealing plate (12) is fixedly connected on the rectangular frame (3) through screws; a limiting convex edge (13) is fixedly connected to the sealing plate (12) at a position close to the vertical plate (7), the limiting convex edge (13) is in close contact with the vertical plate (7).

7. A liquid desulphurization device for a cement kiln according to claim 6, characterized in that: a limiting groove (14) is formed in one side of the limiting convex edge (13) close to the vertical plate (7); a limiting block (15) is fixedly connected to the vertical plate (7) at a position corresponding to the limiting groove (14), the limiting block (15) is slidingly arranged in the limiting groove (14), and the maximum distance of the limiting block (15) sliding in the limiting groove (14) is the length of the first meshing teeth (8).

8. A liquid desulphurization device for use in a cement kiln according to claim 1, characterized in that: The liquid spraying assembly further comprises a fixing ring (16) fixed to the flue pipe; a plurality of fixing blocks (17) are fixed to the fixing ring (16) in a circumferential array; a socket (18) penetrating into the inside of the flue pipe (2) is formed in the fixing block (17); the spray head (4) is arranged in the socket (18); an annular pipe (23) is connected to the input ends of the spray heads (4); and a hose (22) is connected to the annular pipe (23).

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