Externally-hung fuel furnace with good pre-combustion effect

Abstract

The utility model relates to the technical field of combustion furnaces, and discloses an external fuel furnace with a good pre-combustion effect, which comprises a regulation and control detector, a regulation and control controller, a multi-stage feeding section and a pre-combustion section, the multi-stage feeding section comprises an up-down air-locking flap discharging valve, a storage bin and a screw feeder, the discharging end of the up-down air-locking flap discharging valve is communicated with the feeding end of the storage bin, the discharging end of the storage bin is communicated with the feeding end of the screw feeder, and the discharging end of the screw feeder is connected with the pre-combustion section. According to the externally-hung fuel furnace with the good pre-combustion effect, the pre-combustion effect of fuel can be improved by accurately controlling the pre-combustion condition, then the combustion efficiency and the product quality of a cement kiln system are improved, meanwhile, energy utilization can be optimized and energy waste can be reduced through an intelligent control strategy, and therefore the purposes of energy conservation and emission reduction are achieved. In addition, due to the design of the multi-stage feeding section, the automation degree of fuel treatment can be improved, manual intervention is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cement kiln hazardous waste treatment, in particular to an external fuel furnace with good pre-combustion effect. Background Art

[0002] A pre-combustion furnace is a key piece of equipment used in the co-processing of alternative fuels in cement kilns. Its primary function is to preheat and pre-combust alternative fuels to improve their combustion efficiency and quality within the cement kiln. Cement kiln co-processing technology involves mixing alternative fuels, such as municipal solid waste, with raw materials from the cement production process and then calcining them at high temperatures in the cement kiln to render the waste harmless and recycle it. This technology not only reduces cement production's reliance on fossil fuels, but also effectively processes municipal solid waste, achieving the dual goals of environmental protection and resource recycling.

[0003] In the cement kiln co-processing process, the type and characteristics of alternative fuels have a direct impact on the operation of the cement kiln and the quality of the product. The role of the pre-combustion furnace is to pre-treat the alternative fuel to adapt to the combustion conditions of the cement kiln. The pre-combustion furnace can effectively reduce the moisture content of the alternative fuel, increase its calorific value, and improve its combustion characteristics, thereby improving its combustion efficiency and quality in the cement kiln.

[0004] However, in terms of transportation and pretreatment of domestic waste, the existing pre-combustion furnace is prone to stacking, agglomeration, and ringing of domestic waste due to the direct transportation of domestic waste and the direct entry of domestic waste into the decomposition furnace for treatment. It is also prone to instantaneous heat absorption and cooling, which causes a large disturbance to the temperature field of the decomposition furnace. Pre-combustion cannot be carried out well inside the pre-combustion furnace, which limits the improvement of the coordinated disposal of domestic waste in production operations. Therefore, an external fuel furnace with good pre-combustion effect is proposed to solve the above-mentioned problems. Utility Model Content

[0005] (1) Technical problems solved

[0006] In response to the deficiencies in the prior art, the utility model provides an external fuel furnace with good pre-combustion effect, which has the advantages of good pre-combustion effect, etc., and solves the problems of the existing pre-combustion furnace in transporting and pre-treating domestic waste. Since domestic waste is transported directly and directly enters the decomposition furnace for treatment, domestic waste is prone to stacking, agglomeration, and ringing, and is prone to instantaneous heat absorption and cooling, causing great disturbances to the temperature field of the decomposition furnace. Pre-combustion cannot be carried out well inside the pre-combustion furnace, which limits the problem of increasing the collaborative disposal volume of domestic waste through production operations.

[0007] (2) Technical solution

[0008] The utility model solves the above technical problems with the following technical solutions: an external fuel furnace with good pre-combustion effect, comprising a control detector, a control controller, a multi-stage feeding section and a pre-combustion section;

[0009] The multi-stage feeding section includes upper and lower air-locking flap discharge valves, a storage bin and a screw feeder. The discharge ends of the upper and lower air-locking flap discharge valves are connected to the feed end of the storage bin, the discharge end of the storage bin is connected to the feed end of the screw feeder, and the discharge end of the screw feeder is connected to the pre-combustion section.

[0010] The pre-combustion section includes a pre-combustion furnace, a high-temperature regulating air duct and a high-temperature regulating material channel. The feed end of the pre-combustion furnace is connected to the screw feeder, and the output ends of the high-temperature regulating air duct and the high-temperature regulating material channel are connected to the pre-combustion furnace;

[0011] The control detector is arranged inside the pre-combustion furnace and at the discharge end, connected to the control controller, and detects the pre-combustion conditions in the pre-combustion furnace in real time;

[0012] The control controller is connected to the control detector, the high-temperature control air duct and the high-temperature control material channel, receives the signal of the control detector, and controls the high-temperature control air duct and the high-temperature control material channel according to the preset temperature control, air intake volume and feed volume control strategy, so that the pre-combustion furnace is controlled within a preset temperature range.

[0013] The beneficial effects of the utility model are:

[0014] 1. The upper and lower air-locking flap discharge valves can effectively control the quantitative feeding of materials and isolate the outside air during feeding, thereby preventing the outside air from entering the pre-combustion furnace and affecting the pre-combustion effect. In addition, the combination of the storage bin and the screw feeder can further ensure the uniform supply of materials, thereby providing stable material conditions for the subsequent pre-combustion process and helping to improve the pre-treatment effect of the fuel.

[0015] 2. Use the control detector to monitor the pre-combustion conditions in the pre-combustion furnace in real time, and the control controller can accurately control the operation of the high-temperature control air duct and the high-temperature control material channel according to the signal of the detector and the preset control strategy, to ensure that the fuel obtains sufficient heat and air during the pre-combustion process, thereby improving the pre-combustion effect of the fuel, ensuring that the temperature in the pre-combustion furnace is controlled within the preset range, and making the pre-combustion process more stable and efficient.

[0016] On the basis of the above technical solution, the present invention can also be improved as follows.

[0017] Furthermore, the multi-stage feeding section also includes a belt conveyor for conveying materials, and the discharge end of the belt conveyor is connected to the feed end of the upper and lower air-locking flap unloading valves.

[0018] Furthermore, the number of the screw feeders is at least two, and a distributor is provided at the discharge end of the storage bin, and the distributor is used to circulate materials for at least two screw feeders.

[0019] Furthermore, it also includes a decomposition furnace, the discharge end of the pre-combustion furnace is connected to the decomposition furnace, and the decomposition furnace is connected to a tertiary air duct for supplying heat flow.

[0020] Furthermore, the high-temperature regulating air duct includes a regulating air duct, the tertiary air duct is connected to a regulating air duct, the regulating air duct is provided with a regulating valve, and the regulating air duct is connected to the pre-combustion furnace.

[0021] Furthermore, the high-temperature regulating material channel includes a raw material pipe and a regulating material pipe. The raw material pipe is connected to the decomposition furnace for use. The raw material pipe is connected to the regulating material pipe, and the regulating material pipe is provided with a regulating valve. The regulating material pipe is connected to the pre-combustion furnace.

[0022] Furthermore, the control detector includes a thermocouple, which is used to monitor the temperature during the pre-combustion process in the pre-combustion furnace in real time.

[0023] Furthermore, the control controller controls the high-temperature control air duct and the high-temperature control material duct according to the preset temperature control, air intake and feed amount control strategies, so that the pre-combustion furnace is controlled within a preset temperature range; specifically including:

[0024] The temperature value in the pre-combustion furnace is monitored in real time by the thermocouple located in the pre-combustion furnace;

[0025] Compare the acquired real-time temperature value with the pre-combustion temperature threshold range;

[0026] If the real-time temperature value is less than the pre-combustion temperature threshold range, the high-temperature control air duct in the pre-combustion furnace is controlled to be in a high air volume state;

[0027] If the real-time temperature value is within the pre-combustion temperature threshold range, the high-temperature control air duct and the high-temperature control material channel in the pre-combustion furnace are controlled to be in a normal state;

[0028] If the real-time temperature value is greater than the pre-combustion temperature threshold range, the high-temperature control channel in the pre-combustion furnace is controlled to be in a large feeding state. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the utility model;

[0030] Figure 2 This is a schematic diagram of the control flow of the utility model.

[0031] In the figure: 1. Control detector; 2. Control controller; 3. Multi-stage feeding section; 31. Upper and lower air-locking flap discharge valve; 32. Storage bin; 33. Screw feeder; 34. Belt conveyor; 35. Material distributor; 4. Pre-combustion section; 41. Pre-combustion furnace; 42. High-temperature control air duct; 421. Control air duct; 422. Control valve; 43. High-temperature control material channel; 431. Raw material pipe; 432. Control material pipe; 433. Adjustment valve; 5. Decomposition furnace; 6. Tertiary air duct. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In the embodiment, Figure 1-2 Provided is an external fuel furnace with good pre-combustion effect, comprising a control detector 1, a control controller 2, a multi-stage feeding section 3 and a pre-combustion section 4;

[0034] The multi-stage feeding section 3 includes upper and lower air-locking flap discharge valves 31, a storage bin 32, and a screw feeder 33. The discharge ends of the upper and lower air-locking flap discharge valves 31 are connected to the feed end of the storage bin 32, the discharge end of the storage bin 32 is connected to the feed end of the screw feeder 33, and the discharge end of the screw feeder 33 is connected to the pre-combustion section 4.

[0035] The pre-combustion section 4 includes a pre-combustion furnace 41, a high-temperature control air duct 42 and a high-temperature control material channel 43. The feed end of the pre-combustion furnace 41 is connected to the screw feeder 33, and the output ends of the high-temperature control air duct 42 and the high-temperature control material channel 43 are connected to the pre-combustion furnace 41.

[0036] The control detector 1 is arranged inside the pre-combustion furnace 41 and at the discharge end, and is connected to the control controller 2 to detect the pre-combustion conditions in the pre-combustion furnace 41 in real time;

[0037] The control controller 2 is connected to the control detector 1, the high-temperature control air duct 42 and the high-temperature control material channel 43, receives the signal of the control detector 1, and controls the high-temperature control air duct 42 and the high-temperature control material channel 43 according to the preset temperature control, air intake volume and feed volume control strategy, so that the pre-combustion furnace 41 is controlled within the preset temperature range.

[0038] Furthermore, a dispersing mechanism is provided in the pre-combustion furnace 41. The dispersing mechanism includes multiple steps. A set of hydraulic push rods is provided at the top of the multiple steps. An air pulse system is provided on the remaining steps of the multiple steps. The hydraulic push rods and the air pulse system are connected to the control controller 2. The air pulse system consists of air cannons. There are at least five air cannons on each step. The above-mentioned dispersing mechanism is prior art and is therefore not specifically numbered or shown.

[0039] The scattering mechanism can be controlled according to the calorific value of the material and the degree of pre-burning of the material in the furnace; the action time control of the air cannon and the hydraulic push rod can be set to ensure that there is no material accumulation in the pre-combustion furnace 41. Among them, it has the effect of preheating and pre-combustion for light materials, and this part of light materials can be quickly burned when entering the decomposition furnace; for heavy materials with larger particle size and heavier weight, the process of preheating, drying, ignition and most of the combustion can be completed in the pre-combustion furnace, and the particle size and density will also be reduced, which is also conducive to rapid combustion when entering the decomposition furnace again;

[0040] Specifically, the original method of directly feeding the domestic waste into the decomposition furnace 5 is changed to feeding the domestic waste into the decomposition furnace 5 through the multi-stage feeding section 3 and staying at the dispersing mechanism of the pre-combustion furnace 41. After hot air drying and organic matter combustion, the ash and flue gas are further fed into the decomposition furnace 5 for further incineration, thereby further increasing the residence time of the domestic waste in the cement kiln for high-temperature incineration. After the intermediate residence, dispersing and pre-burning, the phenomenon of viscous organic matter in the domestic waste and biomass fuel being wrapped with the raw material is avoided, thereby greatly improving the burnout rate of the domestic waste and biomass fuel during high-temperature calcination. At the same time, the domestic waste and biomass fuel are pre-burned, and after the domestic waste and biomass fuel are dried, the organic matter is burned and dispersed, the domestic waste and biomass fuel are fed into the decomposition furnace and cement kiln, thereby reducing the impact of the direct feeding of domestic waste and biomass fuel into the kiln on the quality (caking, encapsulation, and yellow core material) and output of cement clinker, thereby increasing the amount of domestic waste and biomass fuel that can be processed by the cement kiln.

[0041] The multi-stage feeding section 3 further includes a belt conveyor 34 for conveying materials. The discharge end of the belt conveyor 34 is connected to the feed end of the upper and lower air-locking flap discharge valves 31 .

[0042] Furthermore, there are at least two screw feeders 33 , and a distributor 34 is provided at the discharge end of the storage bin 32 . The distributor 34 is used to circulate materials for the at least two screw feeders 33 .

[0043] The material in the storage bin 32 is circulated and distributed to multiple screw feeders 33 through the distributor 34, which can achieve uniform transportation and continuous processing of the material. Based on the continuity and uniformity of material processing, the coordinated work of multiple feeders ensures the stable operation and efficient processing of the pre-combustion furnace.

[0044] Furthermore, a decomposition furnace 5 is included. The discharge end of the pre-combustion furnace 41 is connected to the decomposition furnace 5. The decomposition furnace 5 is connected to a tertiary air duct 6 for supplying heat flow.

[0045] Furthermore, the high-temperature regulating air duct 42 includes a regulating air duct 421, which is connected to the tertiary air duct 6. The regulating air duct 421 is provided with a regulating valve 422. The regulating air duct 421 is connected to the pre-combustion furnace 41. The high-temperature regulating air duct 42 circulates high-temperature and high-oxygen-content hot air at 900°C.

[0046] Hot air with high oxygen content helps to promote the complete combustion of fuel and reduce incomplete combustion products, thereby reducing environmental pollution and improving energy utilization efficiency. The high-temperature control air duct 42 is based on the characteristics of hot air that quickly heats the fuel and promotes combustion. By precisely controlling the flow rate and temperature of the hot air, the combustion conditions in the pre-combustion furnace can be optimized and the combustion efficiency of the fuel can be improved.

[0047] Furthermore, the high-temperature regulating material channel 43 includes a raw material pipe 431 and a regulating material pipe 432. The raw material pipe 431 is connected to the decomposition furnace 5. The regulating material pipe 432 is connected to the raw material pipe 431. The regulating material pipe 432 is provided with a regulating valve 433. The regulating material pipe 432 is connected to the pre-combustion furnace 41.

[0048] The raw material flowing in the material pipe 432 is regulated to be 758° C., and the temperature control in the pre-combustion furnace 41 can be optimized based on the precise control of the material flow and temperature through the high-temperature regulating channel 43.

[0049] Furthermore, the control detector 1 includes a thermocouple, which is used to monitor the temperature during the pre-combustion process in the pre-combustion furnace 41 in real time.

[0050] Furthermore, the control controller 2 controls the high-temperature control air duct 42 and the high-temperature control material channel 43 according to the preset temperature control, air intake and feed amount control strategies, so that the pre-combustion furnace 41 is controlled within the preset temperature range; specifically, the control includes:

[0051] The temperature value in the pre-combustion furnace 41 is monitored in real time by a thermocouple located in the pre-combustion furnace 41;

[0052] Compare the acquired real-time temperature value with the pre-combustion temperature threshold range;

[0053] Among them, the temperature of the discharge end of the pre-combustion furnace 41 is preferably controlled in the range of 700-900°C, and the pre-combustion temperature threshold range is 700-900°C;

[0054] If the real-time temperature value is less than the pre-combustion temperature threshold range, the high-temperature control air duct 42 in the pre-combustion furnace 41 is controlled to be in a high air volume state, and the high-temperature control material channel 43 is controlled to be in a low material feeding state;

[0055] If the furnace outlet temperature of the real-time temperature value is too low, it is easy to cause poor preheating and precombustion effects of the material in the pre-combustion furnace, so the control controller 2 controls the control valve 422 of the high-temperature control air duct 42 to be fully opened, thereby increasing the tertiary air volume entering the furnace, and opens the regulating valve 433 of the high-temperature control material channel 43 to reduce the amount of raw material leaking into the furnace;

[0056] If the real-time temperature value is within the pre-combustion temperature threshold range, the high-temperature control air duct 42 and the high-temperature control material channel 43 in the pre-combustion furnace 41 are controlled to be in a normal state;

[0057] If the real-time temperature value is greater than the pre-combustion temperature threshold range, the high-temperature control channel 43 in the pre-combustion furnace 41 is controlled to be in a large feeding state and the high-temperature control air duct 42 is in a small air volume state.

[0058] If the furnace outlet temperature of the real-time temperature value is higher than 900 degrees and the rise is rapid, it is easy to cause the pre-combustion furnace outlet temperature to be too high (≥1050℃), damaging the thermocouple and the furnace lining, then the control controller 2 controls the regulating valve 433 of the high-temperature regulating channel 43 to be fully opened, leaking in the raw material to absorb heat and cool it down, and opens the regulating valve 422 of the pre-combustion furnace 41 to reduce the tertiary air volume entering the furnace;

[0059] Working principle:

[0060] Step 1: The material is transported by the belt conveyor 34 into the upper and lower air-lock flap discharge valves 31, and then quantitatively discharged into the storage bin 32 through the upper and lower air-lock flap discharge valves 31. Then, it passes through the distributor 35 in the storage bin 32 and enters multiple screw feeders 33, and finally enters the pre-combustion furnace 41 to ensure the uniform supply of fuel and provide stable material conditions for the subsequent pre-combustion process.

[0061] Step 2: The materials entering the pre-combustion furnace 41 are transported and turned by hydraulic push rods and multiple sets of air cannons. The frequency and stroke of the hydraulic push plate and the frequency of compressed air injection are adjusted according to the combustion characteristics of the alternative fuel to control the pre-burning time of the materials in the pre-combustion furnace 41.

[0062] Step 3: The temperature inside the precombustion furnace 41 is monitored in real time by the control detector 1, and the control controller 2 receives the signal and controls the high-temperature control air duct 42 (high-temperature and high-oxygen content hot air) and the high-temperature control material channel 43 according to the preset strategy to ensure that the temperature inside the precombustion furnace 41 is stable, and a good preheating and preburning effect is achieved for the material. The preheated and preburned material finally enters the decomposition furnace 5.

[0063] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0064] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An external fuel furnace with good pre-combustion effect, characterized by: It comprises a control detector (1), a control controller (2), a multi-stage feeding section (3) and a pre-combustion section (4); The multi-stage feeding section (3) comprises upper and lower air-locking flap discharge valves (31), a storage bin (32) and a screw feeder (33), the discharge ends of the upper and lower air-locking flap discharge valves (31) are in communication with the feed end of the storage bin (32), the discharge end of the storage bin (32) is in communication with the feed end of the screw feeder (33), and the discharge end of the screw feeder (33) is connected to the pre-combustion section (4); The pre-combustion section (4) includes a pre-combustion furnace (41), a high-temperature regulating air duct (42) and a high-temperature regulating material channel (43); the feed end of the pre-combustion furnace (41) is connected to the screw feeder (33); the output ends of the high-temperature regulating air duct (42) and the high-temperature regulating material channel (43) are connected to the pre-combustion furnace (41); The control detector (1) is arranged inside the pre-combustion furnace (41) and at the discharge end, connected to the control controller (2), and detects the pre-combustion conditions in the pre-combustion furnace (41) in real time; The control controller (2) is connected to the control detector (1), the high-temperature control air duct (42) and the high-temperature control material channel (43), receives the signal of the control detector (1), and controls the high-temperature control air duct (42) and the high-temperature control material channel (43) according to a preset temperature control, air intake and feed amount control strategy, so that the pre-combustion furnace (41) is controlled within a preset temperature range.

2. The external fuel stove with good pre-combustion effect according to claim 1, characterized in that: The multi-stage feeding section (3) further comprises a belt conveyor (34) for conveying materials, and the discharge end of the belt conveyor (34) is connected to the feed end of the upper and lower air-locking flap discharge valves (31).

3. The external fuel stove with good pre-combustion effect according to claim 1, characterized in that: The number of the screw feeders (33) is at least two, and a distributor (35) is provided at the discharge end of the storage bin (32). The distributor (35) is used to circulate materials for the at least two screw feeders (33).

4. The external fuel stove with good pre-combustion effect according to claim 1, characterized in that: It also includes a decomposition furnace (5), the discharge end of the pre-combustion furnace (41) is connected to the decomposition furnace (5), and the decomposition furnace (5) is connected to a tertiary air duct (6) for supplying heat flow.

5. The external fuel stove with good pre-combustion effect according to claim 4, characterized in that: The high-temperature regulating air duct (42) comprises a regulating air duct (421), the tertiary air duct (6) is connected to the regulating air duct (421), a regulating valve (422) is provided on the regulating air duct (421), and the regulating air duct (421) is connected to the pre-combustion furnace (41).

6. The external fuel stove with good pre-combustion effect according to claim 4, characterized in that: The high-temperature regulating material channel (43) comprises a raw material pipe (431) and a regulating material pipe (432); the raw material pipe (431) is connected to the decomposition furnace (5); the raw material pipe (431) is connected to the regulating material pipe (432); the regulating material pipe (432) is provided with a regulating valve (433); and the regulating material pipe (432) is connected to the pre-combustion furnace (41).

7. The external fuel stove with good pre-combustion effect according to claim 1, characterized in that: The control detector (1) comprises a thermocouple, which is used to monitor the temperature in the pre-combustion furnace (41) in real time during the pre-combustion process.

8. The external fuel stove with good pre-combustion effect according to claim 7, characterized in that: The control controller (2) controls the high-temperature control air duct (42) and the high-temperature control material duct (43) according to a preset temperature control, air intake volume, and feed volume control strategy, so that the pre-combustion furnace (41) is controlled within a preset temperature range; specifically, the ... so that the pre-combustion furnace (41) is controlled within a preset temperature range; specifically, the control controller (2) controls the high-temperature control air duct (42) and the high-temperature control material duct (43) according to a preset temperature control, Real-time monitoring of the temperature value in the pre-combustion furnace (41) by the thermocouple located in the pre-combustion furnace (41); Compare the acquired real-time temperature value with the pre-combustion temperature threshold range; If the real-time temperature value is less than the pre-combustion temperature threshold range, the high-temperature control air duct (42) in the pre-combustion furnace (41) is controlled to be in a high air volume state; If the real-time temperature value is within the pre-combustion temperature threshold range, the high-temperature control air duct (42) and the high-temperature control material channel (43) in the pre-combustion furnace (41) are controlled to be in a normal state; If the real-time temperature value is greater than the pre-combustion temperature threshold range, the high-temperature control channel (43) in the pre-combustion furnace (41) is controlled to be in a large feeding state.

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