Blending combustion ash material conveying system of circulating fluidized bed boiler
By using a circulating fluidized bed boiler ash conveying system, ash from calcium carbide production is co-fired with coal slime, solving the problems of high difficulty, high cost, and safety hazards in ash treatment, and achieving efficient utilization and good safety of ash.
Patent Information
- Application Number
- CN202423047246.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-10
AI Technical Summary
In existing technologies, the dust generated during calcium carbide production is difficult to handle, costly, and poses safety hazards, leading to resource waste and environmental pollution.
Design a circulating fluidized bed boiler ash conveying system, including a mixing ash silo, a rotary valve, a Roots blower, a feeder, and a circulating fluidized bed boiler return feeder. By co-firing ash from calcium carbide production with coal slime, the system reduces processing difficulty and cost, and improves safety.
This technology enables efficient utilization of dust, reduces processing costs, ensures system safety, and improves dust utilization, thus solving the problem of solid waste treatment in the calcium carbide industry.
Smart Images
Figure CN223595936U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to solid waste recycling technical field relates to a kind of circulating fluidized bed boiler mixed burning ash conveying system. BACKGROUND
[0002] In calcium carbide production, different sections will produce different types of dust, for example: drying flue dust, calcium carbide purification ash and dust. At present, for these dusts, they are collected in batches and then discharged and stacked uniformly, which not only occupies a lot of space, but also causes serious impact on the environment and people's health because these dusts are solid hazardous wastes. In addition, since these dusts still have a certain amount of heat, direct discharge will result in the waste of resources. Therefore, these dusts need to be properly treated. However, the existing treatment method has the following problems: At present, the existing dust treatment method is to send the dust into a fluidized bed boiler for combustion, but the following problems exist: (1) The purification ash has fine particle size, small density, high temperature, easy self-ignition, large dust emission and easy explosion when encountering water, which not only increases the difficulty of treatment, but also has safety hazards; (2) Since these dusts are rapidly burned in the fluidized bed boiler at one time, the separator cannot capture them, which causes serious ash deposition in the tail flue and increases the difficulty and cost of treatment.
[0003] In summary, the current treatment of various dusts produced in calcium carbide production has the technical problems of high treatment difficulty, high treatment cost and safety hazards. CONTENT OF THE UTILITY MODEL
[0004] In view of the technical problems of high treatment difficulty, high treatment cost and safety hazards in the existing dust treatment, the utility model provides a circulating fluidized bed boiler mixed burning ash conveying system.
[0005] The utility model sets up a conveying system to convey various dusts produced in calcium carbide production to the circulating fluidized bed boiler for mixed burning with coal slurry, which reduces the treatment difficulty and cost, is safe and realizes efficient utilization of dust.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A circulating fluidized bed boiler mixed burning ash conveying system, comprising a mixed ash bin, a star-type discharge valve, a Roots blower, a feeder and a circulating fluidized bed boiler return feeder; a plurality of dust feeding pipes are arranged on the top of the mixed ash bin; the bottom of the mixed ash bin is sequentially connected with the star-type discharge valve, the feeder and the circulating fluidized bed boiler return feeder, and the Roots blower is connected with the feeder.
[0008] Further limited, an intermediate ash bin is arranged between the bottom of the mixed ash bin and the star-type discharge valve.
[0009] Further limited, the bottom of the mixed ash bin and the intermediate ash bin are sequentially provided with a plug valve and a blocking valve along the material conveying direction.
[0010] Further limited, the circulating fluidized bed boiler mixed ash conveying system further comprises a balance pipe, the top of the mixed ash bin is communicated with the intermediate ash bin through the balance pipe; a butterfly valve and a one-way valve are sequentially arranged on the balance pipe; the butterfly valve is arranged close to the intermediate ash bin.
[0011] Further limited, the circulating fluidized bed boiler mixed ash conveying system further comprises a nitrogen gas pipeline communicated with the star-shaped discharge valve.
[0012] Further limited, the circulating fluidized bed boiler mixed ash conveying system further comprises a main distributor arranged between the feeder and the circulating fluidized bed boiler return feeder; a discharge valve is further arranged between the feeder and the main distributor.
[0013] Further limited, the circulating fluidized bed boiler mixed ash conveying system further comprises a secondary distributor, the secondary distributor and the circulating fluidized bed boiler return feeder are both multiple, the multiple secondary distributors are all communicated with the main distributor; one secondary distributor is communicated with two circulating fluidized bed boiler return feeders.
[0014] Further limited, the dust feeding pipe comprises a calcium carbide flue dust removal ash pipe, a calcium carbide mixed ash pipe, a semi-coke dust removal ash pipe, a scattered point ash pipe and a calcium carbide purification ash pipe, which are all externally connected with the top of the mixed ash bin.
[0015] The circulating fluidized bed boiler mixed ash conveying system further comprises a bag-type dust collector and a compressed air storage tank communicated with the bag-type dust collector; the calcium carbide flue dust removal ash pipe, the calcium carbide mixed ash pipe and the semi-coke dust removal ash pipe are all externally connected with the top of the mixed ash bin through the bag-type dust collector.
[0016] The circulating fluidized bed boiler mixed ash conveying system further comprises a nitrogen gas recovery dust collector and a high-pressure nitrogen gas pipe communicated with the top of the mixed ash bin respectively; the high-pressure nitrogen gas pipe is also communicated with the top of the nitrogen gas recovery dust collector.
[0017] Compared with the prior art, the circulating fluidized bed boiler mixed ash conveying system has the beneficial effects that:
[0018] 1、The circulating fluidized bed boiler mixed ash conveying system is provided with a mixed ash bin, a star-shaped discharge valve, a Roots blower, a feeder and a circulating fluidized bed boiler return feeder; various dusts in calcium carbide production are mixed first and then conveyed to the circulating fluidized bed boiler to be mixed with coal slime for burning, so that the treatment difficulty and cost are reduced, safety is good, and efficient utilization of the dust is realized.
[0019] 2. The utility model discloses a balance pipe is set up, make the top of mixed ash bin with intermediate ash bin through balance pipe, butterfly valve and check valve are set up in proper order on balance pipe, the dust of mixed ash bin upper part is also sent into intermediate ash bin, improve the conveying efficiency of mixed ash.
[0020] 3. The utility model discloses a main distributor and secondary distributor are set up, thereby even send mixed ash and air into multiple circulating fluidized bed boiler return feeder, improve the conveying efficiency, guarantee the stable operation of circulating fluidized bed boiler.
[0021] 4. The utility model discloses the dust of each way is as mixed burning ash and is passed in circulating fluidized bed boiler and carries out all mixed burning, makes calcium carbide purification ash, drying flue dust, lanthanum carbon dust and the utilization rate of scattered point dust all reach 100%, greatly improves the utilization rate of dust.
[0022] 5. In the utility model, through circulating fluidized bed boiler mixed burning solid waste dust produced in the process of calcium carbide production, not only solve the safety and environmental protection problem in the process of boiling furnace mixed burning, also solve the problem of difficult treatment of solid waste in calcium carbide industry, have extensive practicality and popularization. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 The circulating fluidized bed boiler mixed burning ash conveying system schematic diagram provided by the utility model shows;
[0024] Figure 2 It is the structure schematic diagram of bag type dust collector;
[0025] Among them:
[0026] 1-mixed ash bin;101-calcium carbide flue dust pipe;102-calcium carbide mixed ash pipe;103-lanthanum carbon dust pipe;104-scattered point ash pipe;105-calcium carbide purification ash pipe;2-bag type dust collector;201-ash collection bin;202-feeding valve;203-ash discharge bin;204-ash valve;3-nitrogen recovery dust collector;4-insertion plate valve;5-choke valve;6-intermediate ash bin;7-star type unloading valve;8-nitrogen pipeline;9-feeder;10-roots blower;11-discharge valve;12-circulating fluidized bed boiler return feeder;13-compressed air storage tank;14-check valve;15-butterfly valve;16-main distributor;17-secondary distributor;18-balance pipe;19-high pressure nitrogen pipe. DETAILED DESCRIPTION
[0027] The preferred embodiments of the utility model are described in detail below in combination with the drawings, so that the advantages and characteristics of the utility model can be more easily understood by the person skilled in the art, and the protection scope of the utility model is more clearly and explicitly defined.
[0028] EMBODIMENT
[0029] Referring to Figure 1 The circulating fluidized bed boiler mixed ash conveying system provided by the embodiment comprises a mixed ash bin 1, a star-shaped discharge valve 7, a Roots blower 10, a feeder 9 and a circulating fluidized bed boiler return feeder 12; a plurality of dust feeding pipes are connected to the top of the mixed ash bin 1; the bottom of the mixed ash bin 1 is sequentially communicated with the star-shaped discharge valve 7, the feeder 9 and the circulating fluidized bed boiler return feeder 12, and the Roots blower 10 is communicated with the feeder 9.
[0030] In the embodiment, an intermediate ash bin 6 is further arranged between the bottom of the mixed ash bin 1 and the star-shaped discharge valve 7. A plug valve 4 and a blocking valve 5 are sequentially arranged between the bottom of the mixed ash bin 1 and the intermediate ash bin 6 along the feeding direction.
[0031] Specifically, the mixed ash bin 1 has a hopper structure with an upper column and a lower cone, a plurality of openings are arranged on the sidewall of the top of the mixed ash bin 1 for communication with the plurality of dust feeding pipes; the mixed ash bin 1 is communicated with a discharging pipe, the plug valve 4 and the blocking valve 5 are sequentially arranged on the discharging pipe, the intermediate ash bin 6 is arranged below the mixed ash bin 1, the intermediate ash bin 6 also has a hopper structure with an upper column and a lower cone, the mixed ash bin 1 is communicated with the top of the intermediate ash bin 6 through the discharging pipe, and the bottom of the intermediate ash bin 6 is communicated with the feeder 9 through the star-shaped discharge valve 7.
[0032] In the embodiment, a pneumatic knocking hammer is arranged on the conical part of the lower part of the mixed ash bin 1, and in the process of discharging and conveying the mixed ash, the pneumatic knocking hammer is started to prevent the mixed ash powder from adhering to, clogging and bridging on the inner wall of the mixed ash bin 1 during the conveying process. The mixed ash bin 1 is used for mixing various dusts as the mixed ash for the circulating fluidized bed boiler.
[0033] Preferably, the dust feeding pipes are five, including a calcium carbide flue dust pipe 101, a calcium carbide mixed ash pipe 102, a semi-coke dust pipe 103, a scattered point ash pipe 104 and a calcium carbide purification ash pipe 105, which are all connected to the top of the mixed ash bin 1.
[0034] The circulating fluidized bed boiler mixed ash conveying system further comprises a bag-type dust collector 2 and a compressed air storage tank 13 communicated with the bag-type dust collector 2; the calcium carbide flue dust pipe 101, the calcium carbide mixed ash pipe 102 and the semi-coke dust pipe 103 are all connected to the top of the mixed ash bin 1 through the bag-type dust collector 2. In the use process, large particles in the calcium carbide flue dust and the calcium carbide purification ash are removed by the bag-type dust collector 2, and then the fine dust enters the mixed ash bin 1 to be mixed with other ash. The compressed air storage tank 13 is used for spraying compressed air into the bag-type dust collector 2 to improve the dust collection efficiency; the pressure of the compressed air source is appropriate, P≥0.5MPa.
[0035] Referring to Figure 2In the embodiment, the bag-type dust collector 2 comprises the ash collecting bin 201 and the ash discharging bin 203 which are communicated in sequence from top to bottom, the ash collecting bin 201 is parallel to four, the bottom of each ash collecting bin 201 is communicated with the top of the ash discharging bin 203 through the discharging valve 202, and the bottom of the ash discharging bin 203 is communicated with the mixed ash bin 1 through the ash discharging valve 204. The calcium carbide flue dust, the calcium carbide mixed ash and the semi-coke dust transported from the calcium carbide flue dust pipe 101, the calcium carbide mixed ash pipe 102 and the semi-coke dust pipe 103 enter the bag-type dust collector 2, and after dust removal, mixing and collection, the fine mixed ash is obtained and falls in the four ash collecting bins 201, the mixed ash is discharged to the ash discharging bin 203 through the discharging valve 202, and finally enters the mixed ash bin 1 through the ash discharging valve 204.
[0036] In the implementation, since the dust removal system of the bag-type dust collector 2 contains compressed air and the mixed ash bin 1 is protected by nitrogen, in order to improve the safety of the system operation, the discharging valve 202 and the ash discharging valve 204 cannot be opened at the same time when discharging into the mixed ash bin 1, so that the compressed air cannot enter the mixed ash bin 1. Specifically, the ash discharging valve 204 is closed first, the discharging valve 202 is opened, the mixed ash is discharged from the ash collecting bin 201 to the ash discharging bin 203 to a certain height (preferably 2 / 3 of the height), and then the discharging valve 202 is closed; the ash discharging valve 204 is opened to make the mixed ash in the ash discharging bin 203 fall into the mixed ash bin 1.
[0037] In the implementation, the scattered ash pipe 104 is mainly used for transporting the dust generated by the calcium carbide production equipment into the mixed ash bin 1. In the implementation, according to the distance of the calcium carbide production equipment, the scattered ash generated by the calcium carbide production equipment can be directly transported to the scattered ash pipe 104 through the pneumatic conveying pipeline, or the scattered ash generated by the calcium carbide production equipment can be collected and transported to the scattered ash pipe 104 by using a tank truck.
[0038] The circulating fluidized bed boiler mixed ash conveying system also comprises a nitrogen recovery dust remover 3 and a high-pressure nitrogen pipe 19 which are communicated with the top of the mixed ash bin 1.
[0039] The high-pressure nitrogen pipe 19 is used for filling nitrogen into the mixed ash bin 1 as a protective gas, and spraying nitrogen into the nitrogen recovery dust remover 3 to avoid that the dust carried adheres to the inner wall of the nitrogen recovery dust remover 3. In the implementation, since the calcium carbide purification ash pipe 105 is transported from the calcium carbide section by pneumatic conveying and nitrogen is used, the nitrogen needs to be recovered. Therefore, the nitrogen recovery dust remover 3 is used for recovering the excess nitrogen in the mixed ash bin 1 and removing the dust carried from the mixed ash bin 1.
[0040] The circulating fluidized bed boiler mixed burning ash conveying system further comprises a nitrogen pipeline 8 communicated with the star-shaped discharge valve 7.
[0041] Preferably, the star-shaped discharge valve 7 is two, and is arranged in series between the intermediate ash bin 6 and the feeder 9, and the two star-shaped discharge valves 7 are communicated with the nitrogen pipeline 8.
[0042] The circulating fluidized bed boiler mixed burning ash conveying system further comprises a balance pipe 18, and the top of the mixed ash bin 1 is communicated with the intermediate ash bin 6 through the balance pipe 18, so that the mixed ash bin 1 and the intermediate ash bin 6 are communicated, and the balance pipe 18 plays a role of balancing pressure; a butterfly valve 15 and a check valve 14 are sequentially arranged on the balance pipe 18, and the butterfly valve 15 is arranged close to the intermediate ash bin 6. The balance pipe 18 is arranged to convey the dust at the top of the mixed ash bin 1 to the intermediate ash bin 6, so that the conveying rate of the dust is improved, and the stable operation of the conveying system is ensured. The check valve 14 can only ensure that the dust in the mixed ash bin 1 is output, and cannot flow back into the mixed ash bin 1.
[0043] In the embodiment, the feeder 9 is used to convey the mixed ash discharged from the intermediate ash bin 6 to the circulating fluidized bed boiler return feeder 12, and a Roots blower 10 is used for power conveying during conveying.
[0044] Preferably, the Roots blower 10 is two, and the two Roots blowers 10 are connected with the feeder 9, and the feeder 9 is further communicated with the circulating fluidized bed boiler return feeder 12 through a discharge valve 11. The air generated by the Roots blower is conveyed to the circulating fluidized bed boiler return feeder 12 together with the mixed ash.
[0045] Preferably, the working parameters of the Roots blower 10 are as follows: power 110KW, pressure 58.8kPa, flow 71ml / min, the motor current corresponding to the Roots blower 10 is not higher than 180A, and the motor working temperature is lower than 80℃. In the implementation, a blower pressure transmitter is arranged between the Roots blower 10 and the feeder 9, and is used for monitoring the pressure of the air conveyed by the Roots blower 10, and the air source pressure is adjusted to 0.6MP.
[0046] The circulating fluidized bed boiler mixed burning ash conveying system further comprises a main distributor 16 arranged between the feeder 9 and the circulating fluidized bed boiler return feeder 12; and the discharge valve 11 is further arranged between the feeder 9 and the main distributor 16.
[0047] The circulating fluidized bed boiler mixedly-burned ash conveying system further comprises secondary distributors 17, and the secondary distributors 17 and the circulating fluidized bed boiler return distributors 12 are all multiple, the multiple secondary distributors 17 are all communicated with the main distributor 16; one secondary distributor 17 is communicated with two circulating fluidized bed boiler return distributors 12 correspondingly.
[0048] During implementation, since the circulating fluidized bed boiler return distributors 12 are multiple, the main distributor 16 and the secondary distributors 17 are arranged to uniformly send the mixed ash and air into the multiple circulating fluidized bed boiler return distributors 12.
[0049] Preferably, the circulating fluidized bed boiler return distributors 12 are four, the secondary distributors 17 are two, the mixed ash sent out from the feeder 9 is first conveyed to the input end of the main distributor 16 through the discharge valve 11, then the output end of the main distributor 16 is divided into two branches, the two branches are communicated with the input ends of the two secondary distributors 17 correspondingly; the output end of each secondary distributor 17 is divided into two branches again, so that the mixed ash is evenly divided into four paths through the main distributor 16 and the two secondary distributors 17, and is conveyed into the four circulating fluidized bed boiler return distributors 12 respectively as mixedly-burned ash to be finally sent into the circulating fluidized bed boiler for combustion treatment.
[0050] In the utility model, the return distributor inlet pressure transmitter is further arranged between the discharge valve 11 and the main distributor 16, is used for monitoring the pressure of the mixed ash and air into the circulating fluidized bed boiler return distributor 12, the conveying pressure is 20-50kPa, the conveying amount of the mixed ash is 20-25t / h, and the conveying amount of the air is 50-60ml / min.
[0051] In the utility model, the temperature transmitter is arranged on the mixed ash bin 1, is used for monitoring the temperature in the mixed ash bin 1, and the system stops running when the temperature is greater than 60 DEG C.
[0052] In the utility model, the discharge valve 11 is interlocked with the Roots blower 10, the Roots blower 10 starts after the discharge valve 11 is opened; conversely, the discharge valve 11 is closed after the Roots blower 10 stops.
[0053] When all the mixedly-burned ash of the dust (flue dust, purification ash and scattered ash) of the calcium carbide production is conveyed into the circulating fluidized bed boiler for all mixedly-burning by the circulating fluidized bed boiler mixedly-burned ash conveying system, the indexes of the circulating fluidized bed boiler are all within the controllable range, and the fly ash produced after combustion can meet the requirements of the cement plant, and the problems of the cost generated in the dust treatment process and the environmental pollution are fundamentally solved.
[0054] The above merely illustrates the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which are made according to the content of the present application specification and drawings, are also included in the patent protection scope of the present application.
Claims
1. A circulating fluidized bed boiler co-combustion ash delivery system characterized by, The system comprises a mixed ash bin (1), a star-shaped discharge valve (7), a Roots blower (10), a feeder (9) and a circulating fluidized bed boiler return feeder (12); a plurality of dust feeding pipes are connected to the top of the mixed ash bin (1); the bottom of the mixed ash bin (1) is sequentially communicated with the star-shaped discharge valve (7), the feeder (9) and the circulating fluidized bed boiler return feeder (12), and the Roots blower (10) is communicated with the feeder (9).
2. A circulating fluidized bed boiler hybrid ash conveying system according to claim 1, characterized in that, An intermediate ash bin (6) is further arranged between the bottom of the mixed ash bin (1) and the star-shaped discharge valve (7).
3. A circulating fluidized bed boiler hybrid ash conveying system according to claim 2, characterized in that, A plug valve (4) and a blocking valve (5) are sequentially arranged between the bottom of the mixed ash bin (1) and the intermediate ash bin (6) along the feeding direction.
4. A circulating fluidized bed boiler hybrid ash conveying system according to claim 3, characterized in that, The system further comprises a balance pipe (18), the top of the mixed ash bin (1) is communicated with the intermediate ash bin (6) through the balance pipe (18); a butterfly valve (15) and a one-way valve (14) are sequentially arranged on the balance pipe (18); the butterfly valve (15) is arranged close to the intermediate ash bin (6).
5. The circulating fluidized bed boiler hybrid ash delivery system of claim 2, wherein, The system further comprises a nitrogen gas pipeline (8) communicated with the star-shaped discharge valve (7).
6. The circulating fluidized bed boiler hybrid ash delivery system of claim 1, wherein, The system further comprises a main distributor (16) arranged between the feeder (9) and the circulating fluidized bed boiler return feeder (12); a discharge valve (11) is further arranged between the feeder (9) and the main distributor (16).
7. A circulating fluid bed boiler hybrid ash conveying system according to claim 6, characterized in that, The system further comprises a plurality of secondary distributors (17) and a plurality of circulating fluidized bed boiler return feeders (12); the plurality of secondary distributors (17) are communicated with the main distributor (16); one secondary distributor (17) is communicated with two circulating fluidized bed boiler return feeders (12).
8. The circulating fluidized bed boiler hybrid ash delivery system of claim 1, wherein, The dust feeding pipes comprise a calcium carbide flue dust pipe (101), a calcium carbide mixed ash pipe (102), a semi-coke dust pipe (103), a scattered ash pipe (104) and a calcium carbide purified ash pipe (105) all connected to the top of the mixed ash bin (1).
9. A circulating fluid bed boiler hybrid ash conveying system according to claim 8, characterized in that, The system further comprises a bag-type dust collector (2) and a compressed air storage tank (13) communicated with the bag-type dust collector (2); the calcium carbide flue dust pipe (101), the calcium carbide mixed ash pipe (102) and the semi-coke dust pipe (103) are all connected to the top of the mixed ash bin (1) through the bag-type dust collector (2).
10. The circulating fluidized bed boiler hybrid ash delivery system of claim 8, wherein, The system further comprises a nitrogen gas recovery dust collector (3) and a high-pressure nitrogen gas pipe (19) both communicated with the top of the mixed ash bin (1); the high-pressure nitrogen gas pipe (19) is further communicated with the top of the nitrogen gas recovery dust collector (3).