Belt type roasting device based on rotary air inlet coal conveying

Abstract

The utility model discloses a belt type roasting device based on rotary air inlet coal conveying. The belt type roasting device comprises a belt type roasting machine and a rotary air inlet coal conveying pipeline. The belt type roasting machine comprises a drum drying section, a pumping section, a preheating section, a roasting section, a first cooling section, a second cooling section and a hot air cover arranged above all the sections in a covering mode, the air inlet end of the rotary air inlet coal conveying pipeline is communicated with an air outlet of the hot air cover above the first cooling section through a first hot air circulating pipeline, and the air outlet end of the rotary air inlet coal conveying pipeline surrounds the roasting section by one or more circles from top to bottom and then is communicated with an air inlet of the hot air cover above the roasting section. A pulverized coal injection mechanism and an igniter are arranged on the rotary air inlet coal conveying pipeline, and the igniter is located on the downstream of the pulverized coal injection mechanism according to the trend of airflow. According to the utility model, the secondary hot air pipeline is designed into a rotary pipeline structure surrounding the roasting section, and the sprayed pulverized coal is uniformly mixed and combusted through the rotary action of hot air flow, so that the temperature of secondary hot air is increased, the energy consumption cost is low, and no extra space is occupied.

Description

Technical Field

[0001] The utility model relates to iron and steel metallurgical production equipment, in particular to a belt-type roasting device based on rotary air intake and coal delivery, belonging to the technical field of iron and steel metallurgical production. Background Art

[0002] Oxidized pellets are an important furnace material for blast furnace smelting. At present, the processes for producing oxidized pellets on the market mainly include belt roasting machine, chain grate machine-rotary kiln and vertical furnace pelletizing process. Among them, the vertical furnace pelletizing process has been gradually eliminated, accounting for less than 5% of the market; while the belt roasting machine process is highly favored in the industry due to its advantages such as small footprint, good equipment integrity, advanced energy consumption and emission indicators, and has become the mainstream of the future pelletizing market.

[0003] In the current steel market trend, vigorously developing low-cost pelletizing technology is the key to future steel upgrading and transformation. At present, as the mainstream pelletizing process, the belt roaster is limited by equipment technology and can only use high calorific value gas (natural gas or coke oven gas) as fuel, and cannot use coal powder, resulting in the following problems: 1) High process cost: Since the belt roaster process must currently use high calorific value gas, and the price of this part of high calorific value gas is very high, the process cost of the entire belt roaster to produce pellets remains high; 2) Limited process suitability: In order to build a belt roaster pelletizing production line, it is not economical or realistic for many steel companies to spend a high price to introduce a gas pipeline, which in turn leads to many steel companies being unable to choose the belt roaster process. Utility Model Content

[0004] In view of the problems that the existing belt roasting process in the prior art uses high calorific value coal gas as fuel, but has high production costs and limited applications, the utility model provides a belt roasting device based on rotary air intake and coal feeding. Without occupying additional space, the utility model utilizes the idle space around the belt roasting machine body, designs the existing secondary hot air duct into a rotary duct structure surrounding the roasting section, and provides a plurality of coal powder injection mechanisms and igniters on the duct. Under the rotation of the hot air flow, the injected coal powder is mixed evenly and burns to release heat to increase the temperature of the secondary hot air. That is, the special structural design of the secondary hot air duct achieves the purpose of using cheap coal powder as a heating fuel for roasting, which has the advantages of low energy consumption cost and no additional space occupation.

[0005] In order to achieve the above technical objectives, the technical solutions adopted by the present utility model are as follows:

[0006] A belt roasting device based on rotary air intake and coal feeding, which includes a belt roaster and a rotary air intake and coal feeding pipeline. According to the material flow direction, the belt roaster includes a drying section, a suction drying section, a preheating section, a roasting section, a first cooling section, a second cooling section connected in series in sequence, and a hot air hood covering above each section. The air intake end of the rotary air intake and coal feeding pipeline is connected to the air outlet of the hot air hood above the first cooling section through a first hot air circulation pipeline, and its air outlet end surrounds the outside of the roasting section one or more circles from top to bottom and is connected to the air inlet of the hot air hood above the roasting section. A pulverized coal injection mechanism and an igniter are arranged on the rotary air intake and coal feeding pipeline, and according to the air flow direction, the igniter is located downstream of the pulverized coal injection mechanism.

[0007] Preferably, the air outlet end of the rotary air intake and coal feeding pipeline surrounds the outside of the roasting section one or more circles from top to bottom in the plane of the width direction of the roasting section and is connected to the upper air inlet of the hot air hood above the roasting section (for example, after the air outlet end of the rotary air intake and coal feeding pipeline rotates multiple circles and is located above the hot air hood above the roasting section, it is divided into two air supply pipelines and respectively connected to the upper air inlets on both sides in the width direction of the hot air hood).

[0008] Preferably, multiple independent rotary air intake and coal feeding pipelines are arranged side by side outside the roasting section along the length direction of the roasting section.

[0009] Preferably, multiple igniters are arranged on the rotary air intake and coal feeding pipeline. The multiple igniters are arranged at intervals in sequence. According to the air flow direction, a pulverized coal injection mechanism is independently arranged on the rotary air intake and coal feeding pipeline upstream of each igniter. Preferably, in the vertical direction, the multiple igniters are all located in the middle and / or upper part of any one circle of pipe sections in the rotary air intake and coal feeding pipeline.

[0010] Preferably, the pulverized coal injection mechanism includes a first spray pipe and a second spray pipe. The first spray pipe is connected to the rotary air intake and coal feeding pipeline through the second spray pipe, and an opening valve is arranged on the second spray pipe.

[0011] Preferably, the second spray pipe intersects the rotary air intake and coal feeding pipeline obliquely, and the pulverized coal injection direction is opposite to the hot air flow direction.

[0012] Preferably, the first spray pipe is connected to the rotary air intake and coal feeding pipeline through multiple second spray pipes. An opening valve is independently arranged on each second spray pipe.

[0013] Preferably, the multiple second spray pipes are uniformly distributed in a spiral surrounding manner along the circumferential direction of the rotary air intake and coal feeding pipeline.

[0014] Preferably, the igniter arc positive electrode rod and the arc negative electrode rod. A plurality of arc positive electrode rods and a plurality of arc negative electrode rods are arranged on the opposite side walls of the rotary air inlet and coal feeding pipeline in a one-to-one relative distribution manner along the flow direction of the air flow.

[0015] Preferably, a gas nozzle and / or a steam nozzle are also connected to the rotary air inlet and coal feeding pipeline.

[0016] Preferably, the connection positions of the gas nozzle and / or the steam nozzle with the rotary air inlet and coal feeding pipeline are all located in the middle and / or upper part of any one circle of pipe sections in the rotary air inlet and coal feeding pipeline.

[0017] Preferably, a weighing ash hopper is communicated and arranged on the pipe wall of any one circle of pipe sections of the rotary air inlet and coal feeding pipeline.

[0018] Preferably, on any one circle of pipe sections of the rotary air inlet and coal feeding pipeline, the weighing ash hopper is located at the bottom of this circle of pipe sections.

[0019] Preferably, a horizontal ear plate is fixedly arranged on the upper hopper wall of the weighing ash hopper. The upper surface of the horizontal ear plate is connected to the lower end of the weighing spring, and the upper end of the weighing spring is connected to the outer side wall of the rotary air inlet and coal feeding pipeline.

[0020] Preferably, a plurality of telescopic ash baffle plates are arranged in any one circle of pipe sections of the rotary air inlet and coal feeding pipeline. A plurality of telescopic ash baffle plates are respectively and independently arranged vertically on the inner wall of the pipe cavity of the rotary air inlet and coal feeding pipeline through a plurality of driving motors.

[0021] Preferably, along the air flow direction, a plurality of telescopic ash baffle plates are arranged in a staggered and spaced manner in the pipe cavity of the rotary air inlet and coal feeding pipeline.

[0022] Preferably, along the width direction of the roasting section, a plurality of temperature measuring elements are arranged in the hot air hood above the roasting section.

[0023] Preferably, cold air pipes are connected to the bottom air inlets of the first cooling section and the second cooling section. The top air outlet of the first cooling section is connected to the first hot air circulation pipeline, and a second hot air circulation pipeline is led out from the first hot air circulation pipeline and connected to the top air inlet of the preheating section. The top air outlet of the second cooling section is connected to the bottom air inlet of the drying section through the third hot air circulation pipeline. The bottom air outlet of the roasting section is connected to the top air inlet of the drying section through the fourth hot air circulation pipeline. The top air outlets of the drying section, the bottom air outlets of the drying section and the bottom air outlets of the preheating section are all connected with external exhaust air pipes.

[0024] In the present utility model, generally, a cooling fan blows cooling air into a cooling section through a cooling air inlet duct to cool high-temperature materials in the cooling section. After heat exchange, hot air is formed, and the hot air after heat exchange enters the roasting section through a first hot air circulation duct and a rotary air inlet and coal feeding duct arranged above the roasting section to serve as combustion-supporting air (i.e., secondary hot air). During this process, according to the actual working conditions, pulverized coal is sprayed into the rotary air inlet and coal feeding duct and ignited by an igniter to heat the hot air so that the temperature of the hot air finally entering the roasting section meets the roasting requirements. That is, by utilizing the idle space around the body of the belt-type roasting machine and setting a rotary air inlet and coal feeding duct with a certain height, a place is provided for the spraying and combustion of pulverized coal, enabling pulverized coal to replace high-quality gas as the roasting heat supply fuel without additionally installing a combustion chamber or occupying extra space, significantly reducing the production cost. Compared with high-quality gas, which is expensive and inconvenient to transport, pulverized coal has the advantages of wider distribution, easier source acquisition and transportation, and stronger practicability and economy. That is to say, the present utility model realizes the breakthrough of replacing expensive gas with cheap pulverized coal as the roasting heat supply fuel without reducing the quality of the roasted products, overcomes the deficiencies of high process cost and limited process suitability of the existing belt-type roasting machine, and provides a new development path for the belt-type roasting process in iron and steel pellet production.

[0025] In the present utility model, by utilizing the idle space around the body of the belt-type roasting machine, the traditional secondary air duct is designed into a rotary air inlet and coal feeding duct structure with a certain height, and a plurality of pulverized coal spraying mechanisms (including a first spraying pipe, a second spraying pipe, etc.) and supporting igniters are respectively connected at different positions of the rotary air inlet and coal feeding duct. Their function is to spray pulverized coal into different positions of the rotary air inlet and coal feeding duct, so that the pulverized coal is mixed with the secondary hot air and uniformly descends, and then is ignited by the igniter to increase the temperature of the secondary hot air. It should be noted that there is a preferred scheme for the arrangement of the pulverized coal spraying mechanism here, that is, multiple second spraying pipes are evenly distributed in a circumferential spiral winding manner around the rotary air inlet and coal feeding duct, and are inclined so that the spraying of pulverized coal is reverse spraying relative to the air flow. By adopting this annular spiral reverse spraying method, the mixing rate of pulverized coal and secondary hot air can be effectively enhanced, preventing the occurrence of uneven pulverized coal concentration, and laying a foundation for the subsequent rapid and complete combustion of pulverized coal.

[0026] In the present utility model, a plurality of pulverized coal injection mechanisms are respectively connected to different pipe sections of a rotary air inlet and coal feeding pipe to inject pulverized coal. According to the different combustion efficiencies of different pulverized coals, the pulverized coal can be selectively injected from a plurality of pulverized coal injection mechanisms at different height positions. Generally, the pulverized coal with a longer burnout time or a larger particle size is injected at a more forward position (i.e., closer to the upstream feed and air inlet end of the outer pipe of the rotary air inlet and coal feeding pipe), and vice versa. This enables the pulverized coal to burn out and allows the hot air to quickly enter the roasting section when the hot air temperature is the highest, effectively reducing the heat loss during the flow of the high-temperature hot air in the rotary air inlet and coal feeding pipe. Further, the pulverized coal can also be dispersed and injected through a plurality of pulverized coal injection mechanisms (i.e., after determining the addition amount of the pulverized coal per unit time, the pulverized coal to be added is evenly divided into multiple portions and injected simultaneously from multiple positions, which can cause the pulverized coal to burn simultaneously and contribute to improving the combustion efficiency. Compared with injecting all the pulverized coal from one position at the same time, the time required for pulverized coal injection and burnout can be greatly reduced. It should be noted that when the pulverized coal is injected in a multi-point manner, according to the flow direction of the air flow, the powder amounts injected at each position are equal or gradually decreasing, and are adjusted according to the actual working conditions), enabling the pulverized coal to burn out faster and better, thereby improving the utilization efficiency of the pulverized coal.

[0027] It should be noted that the idle space around the body of the traveling grate stoker is relatively limited, and it takes a certain amount of time for the pulverized coal to be injected and burned out. The design of the rotary air inlet and coal feeding pipe, on the one hand, significantly increases the travel of the pipe in a limited space, which can extend the combustion time of the pulverized coal in the pipe (especially for some pulverized coals with a slower combustion rate or large particle-sized pulverized coals mixed therein, enabling them to burn out before falling into the ash hopper, thereby ensuring the combustion efficiency of the pulverized coal). Moreover, there are air flow and material upward pipe sections in the rotary pipe, which can further ensure that the pulverized coal has sufficient combustion time in the pipe cavity. On the other hand, it can also reduce the downward speed of the pulverized coal, preventing it from falling into the ash hopper before burning out, resulting in waste, or entering the roasting section and affecting the quality of the roasted product. In addition, the rotary design can also cause the hot air from the first cooling section to form a swirling air flow inside it, which is beneficial to further improving the mixing uniformity of the hot air and the pulverized coal. Moreover, the rotary structure has the advantage of controllable feeding speed compared with the straight pipe structure; compared with the folded pipe structure, it has the advantages of smooth downward flow of the powder material and uniform feeding speed. In addition, it also has the advantages of less pipeline erosion and wear, longer pipeline life, and full utilization of the space in the lower workshop of the traveling grate stoker.

[0028] In the present utility model, from top to bottom, a pulverized coal injection mechanism and an igniter are provided at intervals of a certain length of pipe sections on the rotary air inlet and coal feeding pipeline. The pulverized coal injection mechanism is generally located upstream of the igniter. That is, the igniter heats and ignites the mixed fluid formed by the pulverized coal injected by the upstream pulverized coal injection mechanism and the hot air in each section, so that the pulverized coal can be quickly burned out in the rotary air inlet and coal feeding pipeline, thereby significantly increasing the temperature of the secondary hot air, ensuring the uniformity of the temperature in the roasting section, and helping to improve and guarantee the quality of the roasted products.

[0029] In a preferred embodiment of the present utility model, each igniter includes a number of pairs of AC arc electrodes evenly distributed along the air flow direction and symmetrically arranged on the two side pipe walls of the rotary air inlet and coal feeding pipeline. Each pair of electrodes consists of an arc positive electrode rod and an arc negative electrode rod. Its function is to form a breakdown arc between the positive and negative electrode rods to form a local high temperature, thereby igniting the pulverized coal flow passing between the electrode rods, so that the pulverized coal can burn rapidly while flowing downward in the rotary air inlet and coal feeding pipeline.

[0030] In the present utility model, due to the relatively high silicon content in the coal ash, it is easy to cause the agglomeration of pellet ore. To prevent pulverized coal from entering the roasting material layer, weighing ash hoppers are provided at all the low points of the rotary air inlet and coal feeding pipeline (i.e., the lowest end of any one circle of pipe sections in the rotary air inlet and coal feeding pipeline). The upper end of the weighing ash hopper is fixed on the outer pipe wall of the rotary air inlet and coal feeding pipeline through a horizontal ear plate and a weighing spring. The purpose is to accumulate and weigh the coal ash generated by the combustion of pulverized coal in any one circle of pipe sections of the rotary air inlet and coal feeding pipeline under the action of gravity in the weighing ash hopper, so as to judge whether there is an abnormal condition that the coal ash enters the hot air hood in the roasting section or there is unburned pulverized coal. It should be noted that the weighing spring is a weighing spring with an elastic sealing air curtain. The material of the elastic sealing air curtain can be any non-venting soft material and does not affect the expansion and contraction of the spring. Its main function is to ensure airtightness and prevent air leakage. The coal ash collected in the weighing ash hopper can be transported and processed by the ash conveyor belt under the ash discharge port of the ash hopper.

[0031] In the present utility model, a number of telescopic ash baffles (adjusted for their expansion and contraction by a driving motor) are provided in any one circle of pipe sections in the rotary air inlet and coal feeding pipeline. The number of telescopic ash baffles are respectively arranged before and after the direction of the pulverized coal flow (any setting angle should be included in the protection scope of the present utility model). The purpose is to block the pulverized coal and coal ash entrained in the secondary hot air reaching the bottom of any one circle of pipe sections and continuing to flow towards the roasting section through the bottom thereunder under the action of the telescopic ash baffles, and to make the blocked pulverized coal and coal ash settle into the weighing ash hopper below it under the action of natural gravity.

[0032] In the present utility model, a number of temperature measuring elements are also arranged in the hot air hood above the roasting section, aiming to infer whether the temperature in the roasting chamber is uniform through element temperature measurement, and further infer whether unburned pulverized coal has entered the roasting chamber and continued to burn.

[0033] In the present utility model, when the belt roasting device described in the present utility model is used for production, the amount of pulverized coal injected is controlled through the pulverized coal injection mechanism according to the actual working conditions to ensure the stable operation of the system. Specifically: the system will first detect a number of working conditions in the current working conditions (including pellet quality, required roasting temperature, pulverized coal calorific value, etc.), and calculate the value of pulverized coal that should be injected. For example, if the amount of pulverized coal injected through the pulverized coal injection mechanism per unit time is set as W mf , Kg: then there is:

[0034] W mf = W qt ×C qt ×(T 1 - T 0 )÷Q mf (1)

[0035] In formula (1), W qt is the mass of pellets flowing through the roasting section per unit time, Kg. C qt is the specific heat capacity of pellets, KJ / (kg·°C). T 1 is the target temperature to which the pellets in the roasting section need to be heated, °C. T 0 is the initial temperature of the pellets in the roasting section, °C. Q mf is the calorific value of pulverized coal, KJ / Kg.

[0036] Furthermore, when the amount of pulverized coal injected through the pulverized coal injection mechanism per unit time is W mf : the system automatically controls the regulating valve to adjust the opening degree of the second delivery pipe according to this calculated value. At the same time, according to the pulverized coal injection value, the length range of the pipe section of the rotary air inlet and coal delivery pipe that needs to be ignited by an electric arc, as well as the coal ash generation value, etc. are calculated. For example, if the length of the pipe section heated by the igniter for the rotary air inlet and coal delivery pipe is set as L, m. The generated mass of coal ash is W mh , Kg. Then there is:

[0037] L = W mf ×λ×V×d (2)

[0038] W mh = W mf ×η (3)

[0039] In formulas (2)-(3), λ is the length correction coefficient, with a value ranging from 6.0 to 11.8 (preferably 6.5 to 10.6). V is the hot air flow velocity entering the roasting section, in m / s. d is the particle size of the pulverized coal, in m. η is the coal ash generation coefficient, with a value ranging from 0.005 to 0.05.

[0040] It should be noted that the system activates the corresponding arc elements according to the calculation results of formulas (2)-(3). For example, if the calculated height L requires activating 8 pairs of AC arc electrodes, then 8 pairs of AC arc electrodes are activated; if 15 pairs of electrode rods need to be activated, then 15 pairs are activated. After determining the number of pairs of AC arc electrodes to be activated, pulverized coal is injected and burned. During this process, the system will detect whether the weight of the coal ash measured in the weighing ash hopper is equal to the calculated coal ash generation value W mh If they are equal, this adjustment ends; if not, it enters the feedback adjustment link. In the feedback adjustment link, the system will use several temperature measuring elements installed in the hot air hood above the roasting section to detect whether the temperature values at different positions in the hot air hood of the roasting section are uniform: If so, it indicates that the pulverized coal has burned out in the rotary air inlet and coal feeding pipeline, but the coal ash has entered the roasting section. At this time, the system will send a signal to several telescopic ash baffles to increase the telescopic depth of each telescopic ash baffle, reducing the possibility of the pulverized coal being carried into the roasting section by the secondary hot air; If the temperature is not uniform, it indicates that the pulverized coal has not burned out in the rotary air inlet and coal feeding pipeline and there is still secondary combustion after entering the roasting section. At this time, the system will send a signal to the igniter to extend the distance range of the ignition arc area on the rotary air inlet and coal feeding pipeline (i.e., increase the number of pairs of AC arc electrodes activated). After this operation, the system will continue to detect the weight of the ash powder in the weighing ash hopper and compare it with the calculated coal ash generation value. If they are still not equal, the steps of this link are repeated until they are equal; if they are equal, the system defaults that this adjustment ends.

[0041] It should be noted that all the formulas in the present invention are obtained by the inventor through fitting based on experiments and engineering applications. All calculations are based on the values after conversion according to the specified unit conversion. The converted values are substituted into the formulas for calculation (after unit conversion, only the values are substituted into the formulas for calculation, without substituting the units, and the units are only used to adjust the magnitude of the values).

[0042] In the present utility model, a gas injection device (a gas nozzle with a control regulating valve) is additionally provided on the rotary air inlet and coal feeding pipeline. Its function is to supplement gas combustion when the amount of pulverized coal injection cannot be increased, so as to provide qualified high-temperature secondary hot air for the roasting section. In addition, a steam injection device (a steam nozzle with a control regulating valve) is additionally provided on the rotary air inlet and coal feeding pipeline. Its function is to supplement steam injection when both the amount of pulverized coal injection and the amount of gas injection cannot be increased and the pulverized coal is difficult to burn out, so that it reacts with the pulverized coal to produce a water gas reaction, strengthen the burnout rate of the pulverized coal, and provide qualified high-temperature secondary hot air for the roasting section.

[0043] In the present utility model, the belt roasting device of the present utility model has a function associated with an external automatic control and adjustment mechanism, and realizes the automatic and precise control and adjustment of the belt roasting device through the automatic control and adjustment mechanism, thereby ensuring the stability and safety of the system operation.

[0044] In the present utility model, in a preferred embodiment, the pipe diameter of the first hot air circulation pipeline (or the second to fourth hot air circulation pipelines) is 5 - 300 cm, preferably 8 - 200 cm, more preferably 10 - 100 cm. The pipe diameter of the rotary air inlet and coal feeding pipeline is 1 - 200 cm, preferably 3 - 150 cm, more preferably 5 - 80 cm. The pipe diameter of the first spraying pipe in the pulverized coal injection mechanism is 5 - 100 cm, preferably 8 - 80 cm, more preferably 10 - 50 cm. The number of rotation circles of the rotary air inlet and coal feeding pipeline is 1 - 10 circles, preferably 2 - 8 circles, more preferably 3 - 5 circles. The thickness of the hot air hood is 0.1 - 80 cm, preferably 0.5 - 50 cm, more preferably 1 - 30 cm.

[0045] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0046] 1: The present utility model utilizes the idle space around the body of the belt roasting machine, designs the existing secondary hot air pipeline into a rotary pipeline structure surrounding the roasting section, and is equipped with a plurality of pulverized coal injection mechanisms and igniters on the pipeline. Under the rotary action of the hot air flow, the injected pulverized coal is evenly mixed and burned to release heat, thereby increasing the temperature of the secondary hot air, having the advantages of low energy consumption cost and no additional occupation of site, etc.

[0047] 2: The present utility model realizes the breakthrough of using cheap pulverized coal instead of expensive gas as the roasting heating fuel without reducing the quality of the roasted product, overcomes the deficiencies of the high process cost and limited process suitability of the existing belt roasting machine, and provides a new development path for the belt roasting process in iron and steel pellet production.

[0048] 3: The belt roasting device of the present utility model can be implemented without occupying additional space, and has low investment and operation costs. The overall structure is simple, and the operation is stable and reliable, having excellent practical application value in the future market. Description of the Drawings

[0049] Figure 1 It is a schematic cross-sectional structure diagram of the roasting section of the present utility model.

[0050] Figure 2 It is a schematic longitudinal cross-sectional structure diagram of the belt roasting machine of the present utility model.

[0051] Figure 3 It is a schematic structure diagram of the pulverized coal injection mechanism of the present utility model.

[0052] Figure 4 It is a schematic structure diagram of the pulverized coal injection mechanism of the present utility model having multiple second injection pipes.

[0053] Figure 5 It is a schematic cross-sectional structure diagram of the pulverized coal injection mechanism of the present utility model having multiple second injection pipes.

[0054] Figure 6 It is a schematic structure and distribution diagram of the igniter of the present utility model.

[0055] Figure 7 It is an enlarged schematic diagram of the structure and connection mode of the weighing ash hopper of the present utility model.

[0056] Figure 8 It is a schematic structure diagram of the telescopic ash baffle of the present utility model.

[0057] Reference numerals: 1: Belt roasting machine; 101: Drum drying section; 102: Sucking dry section; 103: Preheating section; 104: Roasting section; 105: First cooling section; 106: Second cooling section; 107: Hot air hood; 108: First hot air circulation pipeline; 109: Second hot air circulation pipeline; 110: Third hot air circulation pipeline; 111: Fourth hot air circulation pipeline; 112: Cold air pipe; 113: Exhaust air pipe; 114: Temperature measuring element; 2: Rotary air inlet and coal feeding pipeline; 201: Gas injection pipe; 202: Steam injection pipe; 203: Weighing ash hopper; 204: Horizontal ear plate; 205: Weighing spring; 206: Telescopic ash baffle; 207: Driving motor; 3: Pulverized coal injection mechanism; 301: First injection pipe; 302: Second injection pipe; 303: Opening valve; 4: Igniter; 401: Arc positive electrode rod; 402: Arc negative electrode rod. Detailed Embodiments

[0058] The technical solutions of the present utility model will be illustrated by examples below. The scope of protection claimed by the present utility model includes but is not limited to the following embodiments.

[0059] A belt roasting device based on rotary air intake and coal feeding, which includes a belt roaster 1 and a rotary air intake and coal feeding pipeline 2. According to the material flow direction, the belt roaster 1 includes a drum drying section 101, a suction drying section 102, a preheating section 103, a roasting section 104, a first cooling section 105, a second cooling section 106, which are connected in series in sequence, and a hot air hood 107 covering above each section. The air inlet end of the rotary air intake and coal feeding pipeline 2 is connected to the air outlet of the hot air hood 107 above the first cooling section 105 through a first hot air circulation pipeline 108, and its air outlet end surrounds the outside of the roasting section 104 one or more circles from top to bottom and is connected to the air inlet of the hot air hood 107 above the roasting section 104. A pulverized coal injection mechanism 3 and an igniter 4 are arranged on the rotary air intake and coal feeding pipeline 2, and according to the air flow direction, the igniter 4 is located downstream of the pulverized coal injection mechanism 3.

[0060] Preferably, the air outlet end of the rotary air intake and coal feeding pipeline 2 surrounds the outside of the roasting section 104 one or more circles from top to bottom in the plane of the width direction of the roasting section 104 and is connected to the top air inlet of the hot air hood 107 above the roasting section 104.

[0061] Preferably, a plurality of independent rotary air intake and coal feeding pipelines 2 are arranged side by side outside the roasting section 104 along the length direction of the roasting section 104.

[0062] Preferably, a plurality of igniters 4 are arranged on the rotary air intake and coal feeding pipeline 2. The plurality of igniters 4 are arranged at intervals in sequence. According to the air flow direction, a pulverized coal injection mechanism 3 is independently arranged on the rotary air intake and coal feeding pipeline 2 upstream of each igniter 4. Preferably, in the vertical direction, the plurality of igniters 4 are all located in the middle and / or upper part of any one circle of pipe sections in the rotary air intake and coal feeding pipeline 2.

[0063] Preferably, the pulverized coal injection mechanism 3 includes a first spray pipe 301 and a second spray pipe 302. The first spray pipe 301 is connected to the rotary air intake and coal feeding pipeline 2 through the second spray pipe 302, and an opening valve 303 is arranged on the second spray pipe 302.

[0064] Preferably, the second spray pipe 302 intersects the rotary air intake and coal feeding pipeline 2 obliquely, and the injection direction of the pulverized coal is opposite to the hot air flow direction.

[0065] Preferably, the first spray pipe 301 is connected to the rotary air intake and coal feeding pipeline 2 through a plurality of second spray pipes 302. An opening valve 303 is independently arranged on each second spray pipe 302.

[0066] Preferably, the plurality of second spray pipes 302 are evenly distributed along the circumferential direction of the rotary air intake and coal feeding pipeline 2 in a spiral surrounding manner.

[0067] Preferably, the igniter 4 includes an arc positive electrode rod 401 and an arc negative electrode rod 402. A plurality of arc positive electrode rods 401 and a plurality of arc negative electrode rods 402 are arranged on opposite side walls of the rotary air inlet and coal feeding pipe 2 in a one-to-one corresponding distribution manner along the flow direction of the air flow.

[0068] Preferably, a gas nozzle 201 and / or a steam nozzle 202 is also connected to the rotary air inlet and coal feeding pipe 2.

[0069] Preferably, the connection positions of the gas nozzle 201 and / or the steam nozzle 202 to the rotary air inlet and coal feeding pipe 2 are both located in the middle and / or upper part of any one loop section of the rotary air inlet and coal feeding pipe 2.

[0070] Preferably, a weighing ash hopper 203 is communicatively provided on the pipe wall of any one loop section of the rotary air inlet and coal feeding pipe 2.

[0071] Preferably, on any one loop section of the rotary air inlet and coal feeding pipe 2, the weighing ash hopper 203 is located at the bottommost part of this loop section.

[0072] Preferably, a horizontal ear plate 204 is fixedly provided on the upper hopper wall of the weighing ash hopper 203. The upper surface of the horizontal ear plate 204 is connected to the lower end of a weighing spring 205, and the upper end of the weighing spring 205 is connected to the outer pipe wall of the rotary air inlet and coal feeding pipe 2.

[0073] Preferably, a plurality of telescopic ash baffle plates 206 are provided in any one loop section of the rotary air inlet and coal feeding pipe 2. The plurality of telescopic ash baffle plates 206 are respectively and independently arranged vertically on the inner wall of the pipe cavity of the rotary air inlet and coal feeding pipe 2 through a plurality of driving motors 207.

[0074] Preferably, along the air flow direction, the plurality of telescopic ash baffle plates 206 are arranged in a staggered and spaced manner in the pipe cavity of the rotary air inlet and coal feeding pipe 2.

[0075] Preferably, along the width direction of the roasting section 104, a plurality of temperature measuring elements 114 are provided in the hot air hood 107 above the roasting section 104.

[0076] Preferably, cold air pipes 112 are connected to the bottom air inlets of the first cooling section 105 and the second cooling section 106. The top air outlet of the first cooling section 105 is connected to the first hot air circulation pipe 108, and a second hot air circulation pipe 109 is led out from the first hot air circulation pipe 108 and connected to the top air inlet of the preheating section 103. The top air outlet of the second cooling section 106 is connected to the bottom air inlet of the drum drying section 101 through the third hot air circulation pipe 110. The bottom air outlet of the roasting section 104 is connected to the top air inlet of the draining section 102 through the fourth hot air circulation pipe 111. Exhaust air pipes 113 are connected to the top air outlets of the drum drying section 101, the bottom air outlets of the draining section 102, and the bottom air outlets of the preheating section 103.

[0077] Example 1

[0078] As Figure 1-8 shown, a belt roasting device based on rotary air inlet and coal feeding includes a belt roaster 1 and a rotary air inlet and coal feeding pipe 2. According to the material flow direction, the belt roaster 1 includes a drum drying section 101, a draining section 102, a preheating section 103, a roasting section 104, a first cooling section 105, a second cooling section 106, which are connected in series in sequence, and a hot air hood 107 covering above each section. The air inlet end of the rotary air inlet and coal feeding pipe 2 is communicated with the air outlet of the hot air hood 107 above the first cooling section 105 through the first hot air circulation pipe 108, and its air outlet end surrounds the outside of the roasting section 104 one or more times from top to bottom and is communicated with the air inlet of the hot air hood 107 above the roasting section 104. A pulverized coal injection mechanism 3 and an igniter 4 are arranged on the rotary air inlet and coal feeding pipe 2, and according to the air flow direction, the igniter 4 is located downstream of the pulverized coal injection mechanism 3.

[0079] Example 2

[0080] Repeat Example 1, except that the air outlet end of the rotary air inlet and coal feeding pipe 2 surrounds the outside of the roasting section 104 one or more times from top to bottom in the plane of the width direction of the roasting section 104 and is communicated with the top air inlet of the hot air hood 107 above the roasting section 104.

[0081] Example 3

[0082] Repeat Example 2, except that a plurality of independent rotary air inlet and coal feeding pipes 2 are arranged side by side outside the roasting section 104 along the length direction of the roasting section 104.

[0083] Example 4

[0084] Repeat Example 3, except that a plurality of igniters 4 are arranged on the rotary air inlet and coal feeding pipe 2. The plurality of igniters 4 are arranged at intervals in sequence. According to the air flow direction, a pulverized coal injection mechanism 3 is independently arranged on the rotary air inlet and coal feeding pipe 2 upstream of each igniter 4.

[0085] Example 5

[0086] Repeat Example 4, except that in the vertical direction, multiple ignition devices 4 are all located in the middle and upper parts of any one circle of pipe segments in the rotary air inlet and coal feeding pipeline 2.

[0087] Example 6

[0088] Repeat Example 5, except that the pulverized coal injection mechanism 3 includes a first injection pipe 301 and a second injection pipe 302. The first injection pipe 301 is connected to the rotary air inlet and coal feeding pipeline 2 through the second injection pipe 302, and an opening valve 303 is provided on the second injection pipe 302.

[0089] Example 7

[0090] Repeat Example 6, except that the second injection pipe 302 intersects the rotary air inlet and coal feeding pipeline 2 obliquely, and the injection direction of the pulverized coal is opposite to the direction of the hot air flow.

[0091] Example 8

[0092] Repeat Example 7, except that the first injection pipe 301 is connected to the rotary air inlet and coal feeding pipeline 2 through multiple second injection pipes 302. An opening valve 303 is independently provided on each second injection pipe 302.

[0093] Example 9

[0094] Repeat Example 8, except that multiple second injection pipes 302 are uniformly distributed along the circumferential direction of the rotary air inlet and coal feeding pipeline 2 in a spiral winding manner.

[0095] Example 10

[0096] Repeat Example 9, except that the ignition device 4 has an arc positive electrode rod 401 and an arc negative electrode rod 402. A plurality of arc positive electrode rods 401 and a plurality of arc negative electrode rods 402 are arranged on the opposite side walls of the rotary air inlet and coal feeding pipeline 2 in a one-to-one relative distribution manner along the flow direction of the air flow.

[0097] Example 11

[0098] Repeat Example 10, except that a gas injection pipe 201 and / or a steam injection pipe 202 are further connected to the rotary air inlet and coal feeding pipeline 2.

[0099] Example 12

[0100] Repeat Example 11, except that the connection positions of the gas injection pipe 201 and / or the steam injection pipe 202 to the rotary air inlet and coal feeding pipeline 2 are all located in the middle and / or upper part of any one circle of pipe segments in the rotary air inlet and coal feeding pipeline 2.

[0101] Example 13

[0102] Repeat Example 12, except that a weighing ash hopper 203 is communicatively provided on the pipe wall of any one turn of the rotary air inlet and coal feeding pipe 2.

[0103] Example 14

[0104] Repeat Example 13, except that on any one turn of the rotary air inlet and coal feeding pipe 2, the weighing ash hopper 203 is located at the bottom of this turn of the pipe section.

[0105] Example 15

[0106] Repeat Example 14, except that a horizontal ear plate 204 is fixedly provided on the upper hopper wall of the weighing ash hopper 203. The upper surface of the horizontal ear plate 204 is connected to the lower end of a weighing spring 205, and the upper end of the weighing spring 205 is connected to the outer pipe wall of the rotary air inlet and coal feeding pipe 2.

[0107] Example 16

[0108] Repeat Example 15, except that a plurality of telescopic ash baffle plates 206 are provided in any one turn of the pipe section of the rotary air inlet and coal feeding pipe 2. The plurality of telescopic ash baffle plates 206 are respectively and independently arranged vertically on the inner wall of the pipe cavity of the rotary air inlet and coal feeding pipe 2 through a plurality of drive motors 207.

[0109] Example 17

[0110] Repeat Example 16, except that along the direction of the air flow, the plurality of telescopic ash baffle plates 206 are arranged in a staggered and spaced manner in the pipe cavity of the rotary air inlet and coal feeding pipe 2.

[0111] Example 18

[0112] Repeat Example 17, except that along the width direction of the roasting section 104, a plurality of temperature measuring elements 114 are provided in the hot air hood 107 above the roasting section 104.

[0113] Example 19

[0114] Repeat Example 18, except that cold air pipes 112 are connected to the bottom air inlets of the first cooling section 105 and the second cooling section 106. The top air outlet of the first cooling section 105 is connected to the first hot air circulation pipe 108, and a second hot air circulation pipe 109 is also led out from the first hot air circulation pipe 108 and connected to the top air inlet of the preheating section 103. The top air outlet of the second cooling section 106 is connected to the bottom air inlet of the drum drying section 101 through the third hot air circulation pipe 110. The bottom air outlet of the roasting section 104 is connected to the top air inlet of the draining section 102 through the fourth hot air circulation pipe 111. Exhaust air pipes 113 are connected to the top air outlet of the drum drying section 101, the bottom air outlet of the draining section 102, and the bottom air outlet of the preheating section 103.

Claims

1. A belt type roasting device based on rotary air intake and coal feeding, characterized in that: The device comprises a belt roasting machine (1) and a rotary air inlet coal delivery pipeline (2); according to the direction of the material, the belt roasting machine (1) comprises a drying section (101), a drying section (102), a preheating section (103), a roasting section (104), a cooling section (105), a second cooling section (106) and a hot air hood (107) arranged above each section in series; the air inlet end of the rotary air inlet coal delivery pipeline (2) is connected in series via a first hot air circulation system. The pipeline (108) is connected to the air outlet of the hot air hood (107) above the cooling section (105), and its air outlet end surrounds the outside of the roasting section (104) one or more times from top to bottom and then is connected to the air inlet of the hot air hood (107) above the roasting section (104); a coal powder injection mechanism (3) and an igniter (4) are provided on the rotary air inlet coal delivery pipeline (2), and according to the direction of the air flow, the igniter (4) is located downstream of the coal powder injection mechanism (3).

2. The device according to claim 1, characterized in that: The air outlet end of the rotary air inlet coal delivery pipeline (2) surrounds the outside of the roasting section (104) from top to bottom in a plane in the width direction of the roasting section (104) for one or more circles and then communicates with the upper air inlet of the hot air hood (107) above the roasting section (104).

3. The device according to claim 2, characterized in that: A plurality of mutually independent rotary air inlet and coal conveying pipes (2) are arranged in parallel outside the roasting section (104) along the length direction of the roasting section (104).

4. The device according to claim 1, characterized in that: A plurality of igniters (4) are arranged on a rotary air inlet coal delivery pipeline (2); the plurality of igniters (4) are arranged in a sequentially spaced distribution pattern; and a coal powder injection mechanism (3) is independently arranged on the rotary air inlet coal delivery pipeline (2) upstream of each igniter (4) according to the direction of the airflow.

5. The device according to claim 4, characterized in that: In the vertical direction, the plurality of igniters (4) are located in the middle and / or upper part of any circle of pipe sections in the rotary air inlet coal conveying pipeline (2).

6. The device according to claim 1, characterized in that: The pulverized coal injection mechanism (3) comprises a first injection pipe (301) and a second injection pipe (302); the first injection pipe (301) is connected to the rotary air inlet coal delivery pipeline (2) through the second injection pipe (302), and an opening valve (303) is provided on the second injection pipe (302).

7. The device according to claim 6, characterized in that: The second injection pipe (302) intersects the rotary air-inlet coal-feeding pipeline (2) at an angle, and the injection direction of the coal powder is opposite to the direction of the hot air flow.

8. The device according to claim 6, characterized in that: The first spraying pipe (301) is connected to the rotary air-inlet coal-feeding pipeline (2) through a plurality of second spraying pipes (302); each second spraying pipe (302) is independently provided with an opening valve (303).

9. The device according to claim 8, characterized in that: A plurality of second spray pipes (302) are evenly distributed in a spiral manner along the circumference of the rotary air inlet coal conveying pipeline (2).

10. The device according to claim 1, characterized in that: The igniter (4) comprises an arc positive electrode rod (401) and an arc negative electrode rod (402); a plurality of arc positive electrode rods (401) and a plurality of arc negative electrode rods (402) are arranged on opposite side walls of a rotary air inlet coal delivery pipeline (2) in a one-to-one relative distribution along the flow direction of the airflow.

11. The device according to any one of claims 1 to 10, characterized in that: The rotary air inlet coal delivery pipeline (2) is also connected to a coal gas nozzle (201) and / or a water vapor nozzle (202).

12. The device according to claim 11, characterized in that: The connection positions of the gas nozzle (201) and / or the steam nozzle (202) and the rotary air inlet coal conveying pipeline (2) are all located in the middle and / or upper part of any circle of the pipe section in the rotary air inlet coal conveying pipeline (2).

13. The device according to any one of claims 1 to 10 and 12, characterized in that: A weighing ash hopper (203) is connected and arranged on the pipe wall of any circle of the rotary air inlet coal conveying pipe (2).

14. The device according to claim 13, characterized in that: On any pipe section of the rotary air-inlet coal-feeding pipeline (2), the weighing ash hopper (203) is located at the bottom of the pipe section.

15. The device according to claim 13, characterized in that: A horizontal ear plate (204) is fixedly provided on the upper bucket wall of the weighing ash hopper (203); the upper surface of the horizontal ear plate (204) is connected to the lower end of the weighing spring (205), and the upper end of the weighing spring (205) is connected to the outer pipe wall of the rotary air inlet coal conveying pipeline (2).

16. The device according to any one of claims 1-10, 12, 14-15, characterized in that: A plurality of telescopic ash baffles (206) are arranged in any circle of the rotary air inlet coal conveying pipeline (2); the plurality of telescopic ash baffles (206) are independently arranged vertically on the inner wall of the pipe cavity of the rotary air inlet coal conveying pipeline (2) through a plurality of drive motors (207).

17. The device according to claim 16, characterized in that: Along the direction of the airflow, a plurality of telescopic ash baffles (206) are arranged in a staggered and spaced distribution manner in the tube cavity of the rotary air inlet coal conveying pipeline (2).

18. The device according to any one of claims 1-10, 12, 14-15, 17, characterized in that: Along the width direction of the roasting section (104), a plurality of temperature measuring elements (114) are arranged in the hot air cover (107) above the roasting section (104).

19. The device according to any one of claims 1-10, 12, 14-15, 17, characterized in that: The bottom air inlets of the cooling section (105) and the cooling section (106) are both connected to a cold air duct (112); the top air outlet of the cooling section (105) is connected to the first hot air circulation duct (108), and a second hot air circulation duct (109) is led out from the first hot air circulation duct (108) and connected to the top air inlet of the preheating section (103); the top air outlet of the cooling section (106) is connected to the bottom air inlet of the drying section (101) through a third hot air circulation duct (110); the bottom air outlet of the roasting section (104) is connected to the top air inlet of the drying section (102) through a fourth hot air circulation duct (111); the top air outlet of the drying section (101), the bottom air outlet of the drying section (102) and the bottom air outlet of the preheating section (103) are all connected to an external exhaust duct (113).

20. The device according to claim 11, characterized in that: The bottom air inlets of the cooling section (105) and the cooling section (106) are both connected to a cold air duct (112); the top air outlet of the cooling section (105) is connected to the first hot air circulation duct (108), and a second hot air circulation duct (109) is led out from the first hot air circulation duct (108) and connected to the top air inlet of the preheating section (103); the top air outlet of the cooling section (106) is connected to the bottom air inlet of the drying section (101) through a third hot air circulation duct (110); the bottom air outlet of the roasting section (104) is connected to the top air inlet of the drying section (102) through a fourth hot air circulation duct (111); the top air outlet of the drying section (101), the bottom air outlet of the drying section (102) and the bottom air outlet of the preheating section (103) are all connected to an external exhaust duct (113).

21. The device according to claim 13, characterized in that: The bottom air inlets of the cooling section (105) and the cooling section (106) are both connected to a cold air duct (112); the top air outlet of the cooling section (105) is connected to the first hot air circulation duct (108), and a second hot air circulation duct (109) is led out from the first hot air circulation duct (108) and connected to the top air inlet of the preheating section (103); the top air outlet of the cooling section (106) is connected to the bottom air inlet of the drying section (101) through a third hot air circulation duct (110); the bottom air outlet of the roasting section (104) is connected to the top air inlet of the drying section (102) through a fourth hot air circulation duct (111); the top air outlet of the drying section (101), the bottom air outlet of the drying section (102) and the bottom air outlet of the preheating section (103) are all connected to an external exhaust duct (113).

22. The device according to claim 16, characterized in that: The bottom air inlets of the cooling section (105) and the cooling section (106) are both connected to a cold air duct (112); the top air outlet of the cooling section (105) is connected to the first hot air circulation duct (108), and a second hot air circulation duct (109) is led out from the first hot air circulation duct (108) and connected to the top air inlet of the preheating section (103); the top air outlet of the cooling section (106) is connected to the bottom air inlet of the drying section (101) through a third hot air circulation duct (110); the bottom air outlet of the roasting section (104) is connected to the top air inlet of the drying section (102) through a fourth hot air circulation duct (111); the top air outlet of the drying section (101), the bottom air outlet of the drying section (102) and the bottom air outlet of the preheating section (103) are all connected to an external exhaust duct (113).

23. The device according to claim 18, characterized in that: The bottom air inlets of the cooling section (105) and the cooling section (106) are both connected to a cold air duct (112); the top air outlet of the cooling section (105) is connected to the first hot air circulation duct (108), and a second hot air circulation duct (109) is led out from the first hot air circulation duct (108) and connected to the top air inlet of the preheating section (103); the top air outlet of the cooling section (106) is connected to the bottom air inlet of the drying section (101) through a third hot air circulation duct (110); the bottom air outlet of the roasting section (104) is connected to the top air inlet of the drying section (102) through a fourth hot air circulation duct (111); the top air outlet of the drying section (101), the bottom air outlet of the drying section (102) and the bottom air outlet of the preheating section (103) are all connected to an external exhaust duct (113).

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