Cement kiln biomass alternative fuel large-proportion utilization system

Abstract

The utility model discloses a cement kiln biomass alternative fuel large-proportion utilization system which comprises a material front pretreatment mechanism which is composed of a discharging platform, a disc crusher and a chain plate type feeder, the discharging end of the discharging platform is connected with the feeding end of the disc crusher, and the discharging end of the disc crusher is connected with the feeding end of the chain plate type feeder. The discharging end of the disc crusher is connected with the feeding end of the chain plate type feeder; and the buffer mechanism is arranged to be a stepping type feeding bin. According to the system, the double buffering mechanisms synchronously achieve the stable operation mode of double insurance of materials, the staggered pushing mode and the gradually-changing screw pitch are arranged to guarantee uniform and stable operation of the system, the phenomena of material accumulation and material breakage are effectively avoided, sustainable operation of the whole system is guaranteed, and the service life of the whole system is prolonged. Due to the installation of the air locking device and the flame detection device, backfire can be effectively prevented, and flames can be rapidly detected.

Description

Technical Field

[0001] This utility model specifically relates to the field of cement production technology, and more specifically to a system for the large-scale utilization of biomass as a substitute fuel in cement kilns. Background Technology

[0002] With the gradual popularization of renewable energy, biomass alternative fuels have been widely used in cement production. However, traditional biomass fuel feeding systems suffer from problems such as uneven feeding, inaccurate metering, and low processing efficiency, which directly affect the combustion efficiency and production stability of cement kilns. Therefore, there is an urgent need for a new type of feeding system to improve the feeding efficiency and accuracy of biomass fuels. Utility Model Content

[0003] Therefore, this utility model proposes a system for the large-scale utilization of biomass alternative fuel in cement kilns to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a system for high-proportion utilization of biomass as a substitute fuel in cement kilns, comprising:

[0005] The material pretreatment mechanism consists of a discharge platform, a disc crusher, and a chain plate feeder. The discharge end of the discharge platform is connected to the feed end of the disc crusher, and the discharge end of the disc crusher is connected to the feed end of the chain plate feeder.

[0006] The buffer mechanism is configured as a stepping feed hopper;

[0007] A buffer metering mechanism, which is configured as a metering chamber;

[0008] The conveying mechanism consists of a belt conveyor 1 and a belt conveyor 2, wherein the discharge end of the belt conveyor 1 is connected to the inlet end of the stepping feed hopper, the stepping feed hopper is connected to the inlet end of the belt conveyor 2, and the discharge end of the belt conveyor 2 is connected to the inlet end of the metering hopper.

[0009] And a flame detection mechanism, which consists of flame detection mechanism one and flame detection mechanism two, wherein the feed end of flame detection mechanism one is connected to the discharge end of buffer metering mechanism, the discharge end of flame detection mechanism one is connected to the feed end of airlock mechanism, the discharge end of airlock mechanism is connected to the feed end of flame detection mechanism two, and the discharge end of flame detection mechanism two is connected to pre-combustion mechanism, and the discharge end of pre-combustion mechanism is connected to the feed end of decomposition kiln.

[0010] Furthermore, as a preferred embodiment, the chain plate feeder is equipped with an interlaced sawtooth chain and an adjustable feeding roller to ensure that the biomass material is uniformly and stably conveyed onto the belt conveyor.

[0011] Furthermore, as a preferred embodiment, the discharge device of the stepping feed hopper is configured with an interleaved pushing mode, and the feeding device of the stepping feed hopper is configured with cross-tooth serrations.

[0012] Furthermore, as a preferred embodiment, the bottom helix pitch of the metering chamber is set to a gradually increasing variable pitch.

[0013] Furthermore, as a preferred embodiment, the airlock mechanism includes a pneumatic gate valve one, a rotary feeder, and a double-channel pneumatic gate valve two. The pneumatic gate valve one is connected between the flame detection mechanism one and the rotary feeder. The discharge end of the rotary feeder is connected to the inlet end of the double-channel pneumatic gate valve two, and the discharge ends of the double-channel pneumatic gate valve two are both connected to the inlet end of the flame detection mechanism two.

[0014] Furthermore, as a preferred embodiment, the pre-combustion mechanism includes a screw conveyor and a stepped pre-combustion furnace, wherein the discharge end of the screw conveyor is connected to the feed end of the stepped pre-combustion furnace, and the discharge end of the stepped pre-combustion furnace is connected to the decomposition kiln.

[0015] This invention, employing the above-mentioned technologies, offers the following advantages compared to existing technologies: The feeding system of this invention effectively improves the feeding efficiency and accuracy of biomass alternative fuels, reduces energy consumption in cement production, and minimizes environmental pollution. Simultaneously, through optimized design, the tertiary air duct is designed with a single air inlet, and the inlet height is increased, thereby expanding the reduction zone, nitrogen oxide reduction time, and reduction efficiency, thus lowering the overall nitrogen oxide emission concentration. In summary, the entire system exhibits strong adaptability and reliability, meeting the feeding requirements of different types of biomass fuels, ensuring stable operation of the entire system, effectively reducing nitrogen oxide emissions while preventing safety hazards. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the layout of a system for the large-scale utilization of biomass as a substitute fuel in a cement kiln.

[0017] In the diagram: 101, unloading platform; 102, disc crusher; 103, chain plate feeder; 201, belt conveyor one; 202, belt conveyor two; 301, walking feed hopper; 302, metering hopper; 401, flame detection mechanism one; 402, flame detection mechanism two; 501, pneumatic gate valve one; 502, rotary feeder; 503, pneumatic gate valve two; 601, screw conveyor; 602, stepped pre-combustion furnace. Detailed Implementation

[0018] With reference to the accompanying drawings of the embodiments of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below.

[0019] Example: Please refer to the appendix Figure 1 This utility model provides a technical solution: a system for the large-scale utilization of biomass as a substitute fuel in cement kilns, comprising:

[0020] The material pretreatment mechanism consists of a discharge platform 101, a disc crusher 102, and a chain plate feeder 103. The discharge end of the discharge platform 101 is connected to the feed end of the disc crusher 102, and the discharge end of the disc crusher 102 is connected to the feed end of the chain plate feeder 103.

[0021] Specifically, the disc crusher 102 can adjust the crushing module according to the type and size of the material to crush it into an appropriate size, thereby maximizing the utilization of resources.

[0022] The buffer mechanism can store a certain amount of biomass fuel to balance the fluctuations during the feeding process. The buffer mechanism is set as a step-type feed hopper 301.

[0023] A buffer metering mechanism, which is configured as metering chamber 302;

[0024] Specifically, the buffer metering mechanism is designed to ensure that the biomass fuel does not clog, while also enabling real-time monitoring and precise metering of the biomass fuel. The metering system works in conjunction with the control system to automatically adjust the feeding amount according to the needs of the cement kiln, ensuring the accuracy of feeding.

[0025] The conveying mechanism consists of belt conveyor 201 and belt conveyor 202. The discharge end of belt conveyor 201 is connected to the feed end of step feeding bin 301, the step feeding bin 301 is connected to the feed end of belt conveyor 202, and the discharge end of belt conveyor 202 is connected to the feed end of metering bin 302.

[0026] Specifically, both belt conveyor 1 201 and belt conveyor 2 202 have speed adjustment functions, so as to flexibly adjust the conveying speed according to the needs, ensure stable feeding, and deliver the material to the buffer mechanism stably and evenly.

[0027] And a flame detection mechanism, which consists of flame detection mechanism one 401 and flame detection mechanism two 402. The feed end of flame detection mechanism one 401 is connected to the discharge end of metering chamber 302, the discharge end of flame detection mechanism one 401 is connected to the feed end of airlock mechanism, the discharge end of airlock mechanism is connected to the feed end of flame detection mechanism two 402, and the discharge end of flame detection mechanism two 402 is connected to pre-combustion mechanism, and the discharge end of pre-combustion mechanism 6 is connected to the feed end of decomposition kiln.

[0028] Specifically, both flame detection mechanism 1 (401) and flame detection mechanism 2 (402) are equipped with infrared photosensitive devices. If a flame is detected, the response time is controlled within 4 seconds, and a signal is quickly activated to close the airlock mechanism.

[0029] In this embodiment, the chain plate feeder 103 is equipped with an interlaced sawtooth chain and an adjustable feeding roller to ensure that the biomass material is uniformly and stably conveyed to the belt conveyor 201, avoiding local accumulation of material and ensuring that the biomass fuel entering the subsequent stages is uniform.

[0030] In this embodiment, the discharge device of the step-feeding bin 301 adopts an interleaved pushing mode, and the feeding device of the step-feeding bin 301 adopts a cross-serrated setting.

[0031] In this embodiment, the bottom helix pitch of the metering chamber 302 is set to gradually increase with a variable pitch.

[0032] In this embodiment, the airlock mechanism includes a pneumatic gate valve 501, a rotary feeder 502, and a double-channel pneumatic gate valve 503. The pneumatic gate valve 501 is connected between the flame detection mechanism 401 and the rotary feeder 502. The discharge end of the rotary feeder 502 is connected to the feed end of the double-channel pneumatic gate valve 503, and the discharge ends of the double-channel pneumatic gate valve 503 are both connected to the feed ends of the flame detection mechanism 402.

[0033] It should be added that the discharge end of the rotary feeder 502 is connected to the feed end of the pneumatic three-way device, and the discharge end of the pneumatic three-way device is connected to the double-channel pneumatic gate valve 503; the pneumatic three-way device is equipped with a flap valve, which switches every 6 seconds to realize channel conveying and ensure the safe and efficient operation of the entire system.

[0034] In this embodiment, the pre-combustion mechanism includes a screw conveyor 601 and a stepped pre-combustion furnace 602. The discharge end of the screw conveyor 601 is connected to the feed end of the stepped pre-combustion furnace 602, and the discharge end of the stepped pre-combustion furnace 602 is connected to the decomposition kiln.

[0035] In this embodiment, the inlet to outlet is 135mm, 258mm, and 386mm respectively; the stepped pre-combustion furnace has 11 steps, and the interval between each step is set to 2s. While the material is pre-combusted, it is fed into the kiln evenly, which improves the material burnout rate and the material calorific value utilization rate can reach more than 85%.

[0036] In summary, the biomass alternative fuel feeding system can achieve a tailings replacement rate of over 40%.

[0037] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A system for high-proportion utilization of biomass as a substitute fuel in cement kilns, characterized in that, It includes: The material pretreatment mechanism consists of a discharge platform (101), a disc crusher (102), and a chain plate feeder (103). The discharge end of the discharge platform (101) is connected to the feed end of the disc crusher (102), and the discharge end of the disc crusher (102) is connected to the feed end of the chain plate feeder (103). A buffer mechanism is configured as a stepping feed hopper (301). A buffer metering mechanism, which is configured as a metering chamber (302); The conveying mechanism consists of a belt conveyor one (201) and a belt conveyor two (202), wherein the discharge end of the belt conveyor one (201) is connected to the feed end of the stepping feed hopper (301), the stepping feed hopper (301) is connected to the feed end of the belt conveyor two (202), and the discharge end of the belt conveyor two (202) is connected to the feed end of the metering hopper (302); And a flame detection mechanism, which consists of flame detection mechanism one (401) and flame detection mechanism two (402), wherein the feed end of flame detection mechanism one (401) is connected to the discharge end of metering bin (302), the discharge end of flame detection mechanism one (401) is connected to the feed end of air lock mechanism, the discharge end of air lock mechanism is connected to the feed end of flame detection mechanism two (402), and the discharge end of flame detection mechanism two (402) is connected to pre-combustion mechanism, and the discharge end of pre-combustion mechanism (6) is connected to the feed end of decomposition kiln.

2. The system for high-proportion utilization of biomass as a substitute fuel in cement kilns according to claim 1, characterized in that: The chain plate feeder (103) is equipped with an interlaced sawtooth chain and an adjustable feed roller so that the biomass material is uniformly and stably conveyed to the belt conveyor (201).

3. The system for high-proportion utilization of biomass as a substitute fuel in cement kilns according to claim 2, characterized in that: The discharge device of the step-feeding bin (301) is set in an interleaved pushing mode, and the feeding device of the step-feeding bin (301) is set in a cross-saw pattern.

4. A system for high-proportion utilization of biomass as a substitute fuel in cement kilns according to claim 3, characterized in that: The bottom helix pitch of the metering chamber (302) is set with a gradually increasing variable pitch.

5. A system for high-proportion utilization of biomass as a substitute fuel in cement kilns according to claim 4, characterized in that: The airlock mechanism includes a pneumatic gate valve (501), a rotary feeder (502), and a double-channel pneumatic gate valve (503). The pneumatic gate valve (501) is connected between the flame detection mechanism (401) and the rotary feeder (502). The discharge end of the rotary feeder (502) is connected to the feed end of the double-channel pneumatic gate valve (503), and the discharge ends of the double-channel pneumatic gate valve (503) are all connected to the feed ends of the flame detection mechanism (402).

6. A system for high-proportion utilization of biomass as a substitute fuel in cement kilns according to claim 5, characterized in that: The pre-combustion mechanism includes a screw conveyor (601) and a stepped pre-combustion furnace (602). The discharge end of the screw conveyor (601) is connected to the feed end of the stepped pre-combustion furnace (602), and the discharge end of the stepped pre-combustion furnace (602) is connected to the decomposition kiln.

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