Double-hearth shaft kiln with auxiliary nozzles

Abstract

The utility model relates to a double-hearth shaft kiln with an auxiliary nozzle. The auxiliary nozzle comprises a bottom nozzle and a channel nozzle, the two bottom nozzles are installed on supporting seats arranged in the centers of the bottoms of the two kiln chambers respectively, and spraying openings of the bottom nozzles extend to the bottom of the roasting zone. The multiple channel nozzles are installed on the top and the side portion of the center position of the connecting channel respectively. The working mode that a traditional double-hearth shaft kiln carries out full parallel flow roasting in a roasting kiln hearth and carries out countercurrent heat storage in a heat storage kiln hearth, namely the working mode of'full parallel flow roasting and countercurrent heat storage 'is changed into the working mode that parallel flow roasting is carried out in the roasting kiln hearth and countercurrent roasting and heat storage are carried out in the heat storage kiln hearth. The two-way roasting working mode of parallel-flow roasting, counter-flow roasting and heat storage is adopted, cooling air participates in combustion supporting, then a low-temperature airflow area where roasting belt materials of a heat storage kiln chamber are cooled is eliminated from the source, and the productivity and the product quality are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial furnaces and kilns, in particular to a double-chamber vertical kiln with auxiliary nozzles. Background Art

[0002] At present, most of the high-quality active lime in China is produced by rotary kilns or double-chamber vertical kilns. Compared with rotary kilns, double-chamber vertical kilns have the following advantages: low fuel requirements, almost all fuels can be used; low heat consumption, high thermal efficiency, is the best choice for energy saving and carbon reduction in the lime industry; low and controllable furnace temperature, NO X The amount generated is small; the limestone entering the kiln is large in size, and the power consumption of the ore crushing process is low; the product fly ash rate is low, and the limestone entering the kiln can directly meet the requirements of steelmaking; the requirements for the construction site are not high, and scattered sites can be used.

[0003] Because the double-bore vertical kiln has two major characteristics of parallel flow and heat storage, it has become the most advanced kiln among all lime shaft kilns in terms of product quality and heat consumption. However, the traditional double-bore vertical kiln still has a major defect, that is, the lime cooling air does not participate in combustion, and the cooling air of the circular cross-section double-bore vertical kiln counterflows through the roasting zone to cool the material and cannot promote decomposition. This inherent defect or deficiency affects the development of the double-bore vertical kiln towards large-scale development. In addition, the traditional double-bore vertical kiln has the following technical problems that need to be solved urgently:

[0004] 1) There is a problem of low temperature area in the center of the roasting belt of the roasting kiln;

[0005] In the roasting kiln chamber, the high-temperature exhaust gas flow composed of combustion products and decomposed CO2 flows downward in parallel with the material flow in the roasting zone. In the lower part of the roasting zone, especially near the cooling zone, the high-temperature exhaust gas flow in the center gradually deviates to the edge of the kiln chamber before flowing downward into the annular channel, and a vortex area similar to a cone or hyperbolic cone with the tip facing upward appears. The vortex area is characterized by low heat carried by the gas per unit time and per unit area, and long residence time. It belongs to the low-temperature vortex area. The heat obtained by the material in this area is relatively insufficient, which limits further decomposition. And with the increase of the equivalent diameter of the roasting kiln chamber, the geometric dimensions (height, width or diameter) of the vertical kiln increase in a certain proportion, the deviation of the hot air flow relative to the lower center of the roasting zone also increases, and the range of the vortex area also increases; the larger the specifications of the kiln, the more obvious the under-burning phenomenon caused by insufficient heat supply to the material in this part.

[0006] 2) There is a problem of low temperature area in the center of the heating zone of the heat storage kiln;

[0007] In the heat storage kiln, the air flow and material flow flow in the opposite direction. Two air flows converge at the lower part of the roasting zone and enter the heat storage kiln roasting zone, thereby generating a low-temperature area. One air flow is a high-temperature exhaust gas flow, and the other is a relatively low-temperature air flow, and the two air flows are difficult to merge.

[0008] 2.1) The high-temperature exhaust gas flow is mainly composed of high-temperature exhaust gas from the roasting kiln chamber, which is mixed with cooling air (the amount of cooling air in the roasting kiln chamber is less than that in the heat storage kiln chamber, and the approximate ratio is 4:6) in its annular channel. The high-temperature exhaust gas flow enters the heat storage kiln chamber through the connecting channel, and then directly enters the bottom of the roasting zone of the heat storage kiln chamber from the periphery of the annular channel of the heat storage kiln chamber and flows upward. Although the mixed high-temperature exhaust gas flow is slightly cooled, its temperature is always higher than the material temperature. Therefore, the material is further heated or slowly decomposed wherever the high-temperature air flow reaches.

[0009] 2.2) The relatively low temperature air flow comes from the cooling zone of the heat storage kiln. The cooling air exchanges heat with the material (roasted lime) during the rising process in the cooling zone. Although it has a higher temperature when it rises to the lower part of the roasting zone of the kiln, its maximum temperature can only reach 0.95 times the material temperature, that is, it is always lower than the material temperature in the roasting zone.

[0010] 2.3) Before the two airflows flow countercurrently upward and enter the roasting zone of the heat storage kiln, the relatively low-temperature air flow is affected by the distribution of the surrounding high-temperature exhaust gas flow and is squeezed by the surrounding high-temperature exhaust gas flow to flow in the central area. Wherever the relatively low-temperature air flow reaches, the material is cooled and the temperature of the gas itself rises, and the material will not decompose, causing further low-temperature under-burning. The larger the specification of the vertical kiln, the more obvious the low-temperature area is. This is the biggest reason why the cooling air of the double-bore vertical kiln does not participate in combustion; the two parallel airflows flow upward and diffuse with each other, but due to the poor horizontal diffusion capacity of the space, the airflow temperature is difficult to be uniform, and the cross-sectional temperature is low in the middle and high in the periphery and extends to the preheating zone. Although the airflow temperature in the peripheral area is higher than the material temperature, almost no heat exchange occurs.

[0011] 3) The problem of slow decomposition of materials in double-chamber vertical kilns using low calorific value fuels;

[0012] Roasting zone of the roasting kiln: When low calorific value fuels such as coal gas are not preheated, the fuel burns slowly, the fuel heating temperature is low, the average temperature of the material is low, and the temperature difference between the exhaust gas temperature and the material temperature is small, resulting in slow material decomposition, high heat consumption, large exhaust gas volume, and no obvious advantages in the roasting process;

[0013] The roasting zone of the heat storage kiln: there is almost no temperature difference between the exhaust gas temperature and the material temperature, resulting in the material not being decomposed. After the periodic rotation of the roasting, part of the fuel is used to increase the temperature of the material and increase the heat consumption;

[0014] 4) The low-temperature areas in the center of the roasting kiln chamber and the heat storage kiln chamber are related to the kiln structure and the flow pattern of the airflow distribution. The low-temperature area of ​​the roasting kiln chamber has limited influence, while the negative impact of the low-temperature area of ​​the heat storage kiln chamber is far greater than that of the roasting kiln chamber. In order to compensate for the problem of under-burning of materials caused by the low-temperature area of ​​the roasting zone, the traditional double-bore vertical kiln usually needs to increase the height of the roasting zone (approximately 10%) during design, especially for large-scale double-bore vertical kilns. The height of the roasting zone needs to be higher to reduce the impact of under-burning of materials in the middle part on the overall quality of the product; the resulting problem is that due to the excessive height of the kiln body, the high-temperature gas flow resistance loss is large, the production capacity is low, the power consumption is high, and the infrastructure cost increases; because the low temperature problem in the center of the roasting zone of the double-bore vertical kiln has not been solved from the root, it is difficult for the double-bore vertical kiln to develop in the direction of large-scale.

[0015] 5) Problems with the installation of the spray gun protective cover;

[0016] The spray gun protection cover on the top of the existing double-bore vertical kiln is directly fixed on the kiln shell. As the specifications of the kiln increase, the radius of the kiln chamber increases accordingly, and the spray gun is overhung too long, which makes the installation of the cantilever spray gun protection cover more difficult, making the spray gun prone to tilting or instability.

[0017] 6) Problems caused by adding materials to the kiln top and intermittent feeding;

[0018] The kiln top charging and distribution device of the traditional double-chamber vertical kiln generally consists of 1 elevator, 1 top hopper, 1 electric vibration feeder, 1 reversible belt conveyor, 2 rotary distribution hoppers, and 2 kiln chamber closing gates. The charging operation process of the two kiln chambers is the same, and the operation process of the charging and distribution device is: the elevator sends the material to the top hopper. When the heat storage kiln chamber needs to be charged, the rotary distribution hopper of the kiln chamber rotates, and the reversible belt conveyor works to feed the rotating rotary distribution hopper. Then the electric vibration feeder installed under the top hopper feeds the reversible belt conveyor. When the rotary distribution hopper is full, the feeder, reversible belt conveyor, and rotary distribution hopper are closed; then, the closing gate of the kiln chamber is opened and turned to one side, and the rotary distribution hopper descends to distribute the material to the kiln chamber, and then rises to the loading position, the kiln chamber is closed, and the gate is reset to close, completing a working cycle of the kiln chamber. In this feeding device, the electric vibrating feeder, reversible belt conveyor and rotary distribution hopper occupy a large space when arranged up and down. The belt surface of the reversible belt conveyor is easy to stick to the material. When the belt surface is at the bottom, the powder falls to the ground and pollutes the environment, and needs to be cleaned frequently. The short belt conveyor is easy to deviate and difficult to adjust, and the belt is easily damaged. The rotary distribution hopper pours materials into the kiln in batches in a short time when the kiln chamber is closed and the gate is open. Due to the large fluctuation in the height of the material surface, the temperature of the exhaust gas out of the kiln fluctuates greatly, and the waste heat utilization effect is poor. Summary of the invention

[0019] The utility model provides a double-bore vertical kiln with auxiliary nozzles, which has two completely identical circular cross-section kiln chambers. By adopting auxiliary nozzles, auxiliary nozzle refractory material protection, spray gun protection cover hanging and continuous material distribution and other technical measures, the traditional double-bore vertical kiln performs full parallel flow roasting in the roasting kiln chamber and countercurrent heat storage in the heat storage kiln chamber, that is, the working mode of "full parallel flow roasting + countercurrent heat storage", is changed to a working mode of parallel flow roasting in the roasting kiln chamber and countercurrent roasting and heat storage in the heat storage kiln chamber, that is, "parallel flow roasting + countercurrent roasting and heat storage". The two-way roasting working mode allows the cooling air to participate in the combustion, thereby eliminating the low-temperature airflow area where the roasting belt materials in the heat storage kiln chamber are cooled from the root, improving the low-temperature eddy current area of ​​the roasting belt in the roasting kiln chamber, and making the heat distribution between the center and the periphery of the vertical kiln uniform; the overall temperature of the roasting belt is increased to accelerate the decomposition of the material, while the exhaust gas temperature is reduced and the fluctuation range of the exhaust gas temperature is reduced. There is no need to increase the height of the roasting belt, which solves many problems such as under-burning of materials in existing double-chamber vertical kilns, improves production capacity and product quality, and simplifies the kiln top feeding facilities and smoke exhaust facilities.

[0020] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0021] A double-bore vertical kiln with auxiliary nozzles comprises a first kiln chamber and a second kiln chamber, wherein the first kiln chamber and the second kiln chamber have the same circular cross-section, and spray guns and spray gun protection covers are arranged on the upper parts of the first kiln chamber and the second kiln chamber; annular channels are arranged in the middle and lower parts of the first kiln chamber and the second kiln chamber, and the tops of the two annular channels are connected through a connecting channel; the double-bore vertical kiln is also provided with auxiliary nozzles; the auxiliary nozzles comprise bottom nozzles and channel nozzles; there are two bottom nozzles, which are respectively mounted on support seats arranged at the centers of the bottoms of the two kiln chambers, and the spray outlets of the bottom nozzles extend to the bottom of the roasting zone; there are multiple channel nozzles, which are respectively mounted on the top and sides of the center of the connecting channel.

[0022] Furthermore, the bottom nozzle is composed of a fuel delivery conduit, a conduit protection sleeve, a fuel distributor and a fuel nozzle; the fuel delivery conduit and the conduit protection sleeve are connected by a number of ribs arranged at longitudinal intervals to form a sleeve support column; the bottom of the sleeve support column is fixedly connected to a center seat plate arranged on a corresponding kiln chamber bottom support frame; the annular gap in the sleeve support column is a natural convection layer of air; the top end of the fuel delivery conduit is connected to the fuel inlet at the bottom of the fuel distributor, and a number of radial nozzle interfaces are evenly arranged on the side of the fuel distributor, and the fuel nozzles are arranged at the nozzle interfaces one by one.

[0023] Furthermore, the fuel distributor is composed of a disc-shaped porous member, a conical interface and an end cover; a plurality of nozzle interfaces are arranged in an annular direction on the outer side of the disc-shaped porous member, a fuel inlet is arranged at the bottom of the disc-shaped porous member, and the fuel inlet is connected to the fuel delivery conduit through the conical interface; the top of the disc-shaped porous member is closed by the end cover; the fuel nozzle is connected to the nozzle interface of the disc-shaped porous member through a thread.

[0024] Furthermore, a heat insulation protection structure is provided at the bottom nozzle, wherein:

[0025] A refractory heat insulation layer and a refractory brick protective layer are arranged on the outside of the bottom nozzle. The refractory brick protective layer is a three-dimensional interlocking structure with convex-concave interlocking between the upper and lower layers, convex-concave interlocking between the circumferential direction, and convex-concave interlocking between the radial direction; a nozzle brick is arranged on the outside of the fuel nozzle, and an annular gap is left between the fuel nozzle and the nozzle brick, which is densely filled with flexible refractory fillers; the nozzle brick and the refractory brick layers above and below it are interlocked with convex-concave, and a notch is arranged at the bottom of the outer end of the nozzle brick;

[0026] A frustum and a dividing cone cap composed of multiple layers of fired refractory bricks are arranged on the top of the fuel nozzle, and the layers of fired refractory bricks have a convex-concave interlocking structure; the bottom groove of the lowest layer of fired refractory bricks is clamped with the boss on the corresponding side of the burner brick and the heat-resistant steel positioning ring welded on the top of the end cover to form a convex-concave interlocking structure; a dividing cone cap is arranged on the top of the frustum, and the dividing cone cap is a refractory prefabricated block with a conduit and an anchor hook inside, which is connected to the heat-resistant steel pull ring welded on the top cover through the anchor hook to form a hollow cone structure, and amorphous refractory injection material is poured into the hollow cone through the conduit to form a dividing cone with an integrated structure.

[0027] Furthermore, the channel nozzle is a fuel nozzle with a flame stabilizer; a plurality of channel nozzles are symmetrically arranged on the top and sides of the connecting channel with the central axis of the connecting channel as the axis of symmetry, and the injection end of the channel nozzle passes through the refractory masonry on the top and side of the connecting channel and extends into the connecting channel.

[0028] Furthermore, a top hopper is provided above the double-chamber vertical kiln, and rotary distributors are provided below the feed port of kiln chamber one and kiln chamber two; two discharge ports are symmetrically provided on the top hopper, which are respectively connected to the rotary distributor in kiln chamber one and the rotary distributor in kiln chamber two through corresponding vibrating feeders.

[0029] Furthermore, the rotary distributor includes a shell, a reduction motor, a shaft, a funnel and a stone spreading plate. The shell is a cylindrical structure and is installed at the center of the kiln top. A feed gate is installed on the upper side of the shell, and the bottom of the shell is directly and sealedly connected to the corresponding kiln chamber. The reduction motor is installed outside the shell, connected to the funnel and the stone spreading device through the shaft, and drives the funnel and the stone spreading plate to rotate synchronously. The shell and the shaft are sealedly connected.

[0030] Furthermore, the spray gun and the spray gun protection cover are suspended in the corresponding kiln chamber through a hanging structure; when the spray gun protection cover is a long cantilever structure, its fixed end is welded to the kiln shell, and the cantilever end is connected to the hanging structure; the hanging structure is composed of a hanging beam, a guide support, a hanging rod, and a cork filler; the hanging beam is arranged above the spray gun protection cover, and is composed of a plurality of beams arranged radially from the center; the guide support is welded to the inner wall of the kiln shell; the outer end of the beam is placed on the guide support and is radially slidably connected to the support, an expansion joint is left between the beam and the inner wall of the kiln shell, and the expansion joint is filled with cork filler; the lower end of the hanging rod is fixed to the spray gun protection cover, and the upper end of the hanging rod is hinged to the hanging beam to form a hanging structure.

[0031] Compared with the prior art, the beneficial effects of the utility model are:

[0032] 1) When the double-bore vertical kiln with auxiliary nozzles described in the utility model adopts the normal roasting mode, heat is supplied through the bottom nozzle of the heat storage kiln chamber, and the material to be decomposed in the central part is changed from a cooled state to a heated state, so that the heat distribution between the central part and the peripheral part is uniform, and countercurrent roasting and heat storage of the material in the central part are realized, thereby realizing the two-way roasting working mode of "parallel roasting + countercurrent roasting and heat storage", eliminating the low-temperature area in the central part of the roasting zone of the heat storage kiln chamber in the "full parallel roasting + countercurrent heat storage" mode of the traditional double-bore vertical kiln, and compensating for the insufficient heat supply in the low-temperature eddy current area of ​​the roasting kiln chamber, while promoting the rapid decomposition of the material in the central part of the parallel roasting kiln chamber, improving product quality and reducing heat consumption.

[0033] 2) When the double-bore vertical kiln with auxiliary nozzles described in the utility model adopts the overall heating mode, the channel nozzle and the bottom nozzle are used to supply heat synchronously, so that the countercurrent roasting and heat storage of the material are realized, thereby realizing the two-way roasting working mode of "parallel roasting + countercurrent roasting and heat storage", which not only eliminates the low-temperature area in the center of the roasting zone of the traditional double-bore vertical kiln heat storage kiln, but also makes the heat distribution between the center and the surrounding areas uniform and the roasting zone is heated as a whole. When using gas fuel, especially gas fuel with a low calorific value, it is very important to promote the rapid decomposition of materials in the parallel roasting kiln chamber, improve product quality, and reduce heat consumption. In addition, it is particularly suitable for occasions where the fuel calorific value factor is not considered and the roasting zone needs to be heated as a whole, such as the production of low residual CO2 lime for chemical industry or hard-burned lime for other purposes.

[0034] 3) The double-chamber vertical kiln with auxiliary nozzles described in the utility model eliminates the low-temperature airflow area where the materials in the roasting zone of the heat storage kiln chamber are cooled from the root, and can achieve the overall temperature increase of the roasting zone. Therefore, the roasting zone of the kiln chamber does not need to be increased in height, avoiding the problem of under-burning of materials caused by increasing the height of the roasting zone to compensate for the low-temperature area of ​​the roasting zone in the traditional double-chamber vertical kiln, as well as the problems of too high kiln body, large gas flow resistance loss, low production capacity, high power consumption and increased infrastructure costs caused by increasing the height of the roasting zone.

[0035] 4) In the double-chamber vertical kiln with auxiliary nozzles described in the utility model, the fuel of the auxiliary nozzles is completely utilized for combustion-supporting air of lime, which reduces the consumption of combustion-supporting air entering the roasting kiln chamber, reduces the exhaust gas emission, reduces the flow resistance of the kiln chamber, and makes up for the deficiency of the traditional double-chamber vertical kiln that the lime cooling air does not participate in combustion.

[0036] 5) The double-chamber vertical kiln with auxiliary nozzles described in the utility model adopts a top hopper with double discharge ports for feeding and distributing. The vibrating feeder in each kiln chamber directly feeds the rotary distributor through the feed gate, which reduces the loading and lifting height. The shell and feed gate of the rotary distributor form a sealing system with the kiln chamber, which simplifies the distributing facilities, realizes the continuous distributing of the rotary distributor to the kiln chamber, reduces the exhaust gas temperature, and avoids the large fluctuation of the exhaust gas temperature caused by the large fluctuation of the material surface height when discharging in batches.

[0037] 6) The double-bore vertical kiln with auxiliary nozzles described in the utility model adopts auxiliary nozzle combustion technology, spray gun and protective cover hanging installation technology, improved material distribution technology and other measures to solve the problems of local low temperature in the roasting zone of traditional double-bore vertical kilns and the difficulty in installing the spray gun protective cover of large-scale double-bore vertical kilns, and easy tilting or instability. It is suitable for the transformation of traditional double-bore vertical kilns and makes it possible for double-bore vertical kilns to develop in the direction of large-scale; at the same time, compared with other lime production equipment rotary kilns, this large-scale double-bore vertical kiln with auxiliary nozzles has low requirements on fuel conditions and can use almost all fuels; it has low heat consumption, high thermal efficiency, low and controllable furnace temperature, NO X With advantages such as small amount of production, it is the best choice for energy saving and carbon reduction in large kilns in the lime industry, active lime for metallurgy, and low raw burning rate lime for chemical industry.

[0038] 7) The utility model is particularly suitable for large-scale double-chamber vertical kilns of 800tpd and 1000tpd or more, which not only provides a new technical approach for the large-scale double-chamber lime vertical kiln, but also provides a new technical approach for the development of double-chamber vertical kilns with low calorific value fuels. It has the obvious advantages of low nitrogen oxides, low calorific value and cheap fuel, low heat consumption and low ash content, and can replace rotary kilns, with broad development prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1The utility model is a schematic structural diagram of a double-chamber vertical kiln with auxiliary nozzles.

[0040] Figure 2 yes Figure 1 A magnified view of a part (bottom nozzle and thermal insulation protective layer cross-sectional structure).

[0041] Figure 3 yes Figure 1 AA view in.

[0042] Figure 4 It is a front view of the refractory bricks in the refractory brick protective layer of the utility model.

[0043] Figure 5 yes Figure 4 A view in the figure.

[0044] Figure 6 yes Figure 4 B view in the figure.

[0045] Figure 7 It is a schematic diagram of the planar structure of two kiln chambers with annular channels and a connecting channel described in the utility model.

[0046] Figure 8 It is a cross-sectional schematic diagram of the connecting channel of the utility model.

[0047] In the figure: 1-kiln chamber 1; 2-kiln chamber 2; 3-connecting channel 4-combustion air duct; 5-feeding elevator; 6-top hopper; 7-vibrating feeder 1; 8-vibrating feeder 2; 9-feeding gate 1; 10-feeding gate 2; 11-rotating distributor 1; 11a-housing 1; 11b-reduction motor 1; 11c-shaft rod 1; 11d-funnel 1; 11e-stone spreading plate 1; 12-rotating distributor 2; 12a-housing 2; 12b-reduction motor 2; 12c-shaft rod 2; 12 d-funnel 2; 12e-stone slab 2; 13-air / exhaust reversing gate 1; 14-air / exhaust reversing gate 2; a-air inlet; b-exhaust outlet; 15-spray gun 1; 16-spray gun 2; 17-spray gun protection cover 1; 18-spray gun protection cover 2; 19-hanging structure 1; 19a-hanging crossbeam 1; 19b-guide support 1; 19c-hanging rod 1; 19d-cork filler 1; 20-hanging structure 2; 20a-hanging crossbeam 2; 20b-guide support 2; 20 c-suspender rod 2; 20d-cork filler 2; 21-bottom nozzle 1; 22-bottom nozzle 2; 23-insulation protection structure 1; 24-insulation protection structure 2; 25-support frame 1; 26-support frame 2; 27-discharging machine 1; 28-discharging machine 2; 29-cooling air duct 1; 30-cooling air duct 2; 31-channel nozzle; 31a-top channel nozzle; 31b-side channel nozzle; 41-fuel delivery duct; 42-duct protection cover; 43-rib plate; 44-disk shaped porous part; 45-conical interface; 46-end cover; 47-countersunk bolt; 48-fuel nozzle; 51-refractory insulation layer; 52-refractory brick protective layer; 53-nozzle brick; 54-flexible refractory filler; 55, 56, 57-fired refractory bricks; 58-heat-resistant steel positioning ring; 59-refractory prefabricated block; 60-conduit with anchor; 61-upper section of anchor hook; 62-lower section of anchor hook; 63-heat-resistant steel pull ring; 64-refractory castable; Ⅰ-preheating zone; Ⅱ-baking zone; Ⅲ-cooling zone. DETAILED DESCRIPTION

[0048] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0049] like Figure 1 , Figure 2 , Figure 7 , Figure 8As shown, the double-chamber vertical kiln with auxiliary nozzles described in the utility model has two identical kiln chambers, namely, kiln chamber 1 and kiln chamber 2; each kiln chamber is divided into cooling zone III, roasting zone II and preheating zone I from bottom to top, and a ring channel is provided in the middle and lower part of each kiln chamber and connected through a connecting channel 3. The functions of kiln chamber 1 and kiln chamber 2 are alternately changed, such as kiln chamber 1 is used as a parallel-flow roasting kiln chamber, and kiln chamber 2 is used as a counter-flow roasting and heat storage kiln chamber. The two kiln chambers exchange functions after a period of time, and the operation of the corresponding equipment changes with the change of the kiln chamber function.

[0050] like Figure 1 , Figure 2 As shown, in the utility model, the auxiliary nozzle is a nozzle with an auxiliary roasting function, which is composed of a bottom nozzle 21 arranged in the kiln chamber 1, a bottom nozzle 22 arranged in the kiln chamber 2, and a channel nozzle 31 arranged at the connecting channel 3; the bottom nozzle 21 and the bottom nozzle 22 are respectively installed on the support seat of the support frame 25 in the corresponding kiln chamber 1 and the support seat of the support frame 26 in the kiln chamber 2, and the spray ports of the bottom nozzle 21 and the bottom nozzle 22 extend to the bottom of the corresponding roasting zone respectively. The fuel sprayed into the kiln chamber 1 or the kiln chamber 2 by the bottom nozzle 21 or the bottom nozzle 22 burns and releases heat under the combustion assistance of the cooling air for cooling the lime; as shown Figure 7 , Figure 8 As shown, the channel nozzle 31 is divided into a top channel nozzle 31a and a side channel nozzle 31b, which are symmetrically installed at the top and side of the center position of the connecting channel 3 respectively. The fuel sprayed into the exhaust gas of the connecting channel by the top channel nozzle 31a and the side channel 31b burns and releases heat under the assistance of the cooling air that cools the lime in the exhaust gas.

[0051] The top hopper 6 is a common equipment for kiln chamber 1 and kiln chamber 2, and is provided with two completely symmetrical discharge ports, which are respectively connected to the vibrating feeder 1 7 in kiln chamber 1 and the vibrating feeder 2 8 in kiln chamber 2. The performance of the two vibrating feeders is the same, that is, they directly feed the rotary distributor in the corresponding kiln chamber.

[0052] The top hopper 6 is fed by the loading elevator 5, which is a common device for the kiln chamber 1 and the kiln chamber 2. The feeding direction of the loading elevator 5 and the throwing direction to the top hopper 6 are both perpendicular to the two discharge ports of the top hopper 6. The loading elevator 5 can be a single-bucket elevator, a multi-bucket elevator or a belt conveyor.

[0053] like Figure 1As shown, the performance of the rotary distributor 11 in the kiln chamber 1 and the rotary distributor 2 12 in the kiln chamber 2 are exactly the same. The rotary distributor 11 is composed of a shell 11a and a rotating mechanism 1, and the rotary distributor 2 is composed of a shell 2 12a and a rotating mechanism 2. The shell 11a and the shell 2 12a are cylindrical structures and are installed in the center of the corresponding kiln top. The upper side of the shell 11a and the shell 2 12a are respectively installed with a feed gate 19 and a feed gate 2 10 for controlling the opening and closing of the corresponding feed port. The bottom of the shell 11a and the shell 2 12a are directly connected to the corresponding kiln chamber and form a sealing system. The rotating mechanism 1 and the rotating mechanism 2 are used to continuously distribute materials into the corresponding kiln chamber. The first rotating mechanism includes a reduction motor 11b, a shaft 11c, a hopper 11d and a stone plate 11e. The reduction motor 11b is installed outside the housing 11a and connected to the hopper 11d and the stone plate 11e through the shaft 11c to achieve synchronous rotation. The housing 11a is sealed with the shaft 11c through a sealing structure. The second rotating mechanism includes a reduction motor 12b, a shaft 12c, a hopper 12d and a stone plate 12e. The reduction motor 12b is installed outside the housing 12a and connected to the hopper 12d and the stone plate 12e through the shaft 12c to achieve synchronous rotation. The housing 12a is sealed with the shaft 12c through a sealing structure.

[0054] Air / exhaust gas reversing damper 13 and air / exhaust gas reversing damper 2 14 are used for the exchange of combustion air and exhaust gas in the corresponding kiln chamber, a is the air inlet, b is the exhaust gas outlet, and the air / exhaust gas reversing damper of each kiln chamber is composed of 1 or 2 parallel connected air / exhaust gas reversing dampers.

[0055] Spray gun 15 and spray gun 2 16 are supported by corresponding spray gun protective cover 17 and spray gun protective cover 2 18 respectively, extending from the upper part of preheating zone I into kiln chamber 1 and kiln chamber 2 2, and the muzzle of the spray gun is bent downward and extends to the upper part of roasting zone II, and several spray guns are evenly distributed according to the cross-sectional size of the kiln chamber; every two spray guns share a spray gun protective cover. The length of the spray gun protective cover varies, among which the fixed end of the short cantilever protective cover is directly welded to the kiln shell, while the fixed end of the long cantilever protective cover is welded to the kiln shell, and the cantilever end is fixed by hanging structure 19 and hanging structure 20, to ensure the stability of the installation of spray gun 15, spray gun 2 16 and spray gun protective cover 17 and spray gun protective cover 2 18 in large-scale double-bore vertical kiln.

[0056] The hanging structure 19 is composed of a hanging beam 19a, a guide support 19b, a hanging rod 19c, and a cork filler 19d. The hanging structure 20 is composed of a hanging beam 20a, a guide support 20b, a hanging rod 20c, and a cork filler 20d. The hanging beam 19a and the hanging beam 20a are respectively located above the corresponding spray gun protection cover 17 and the spray gun protection cover 219, and are radial structures intertwined in the center and with multiple support points at the outer end; the number of support points is determined according to the number of long cantilever protection covers. The guide support 19b and the guide support 20b are respectively welded on the inner wall of the kiln shell at the preheating zone I in the corresponding kiln chamber 1 and the kiln chamber 2; the ends of the hanging beam 19a and the hanging beam 20a are placed on the corresponding guide supports and maintain radial sliding with the corresponding guide supports, and expansion joints for absorbing the expansion of the beams are left between the ends of the hanging beam 19a and the hanging beam 20a and the inner wall of the kiln shell, and the expansion joints are filled with cork filler 19d and cork filler 20d accordingly; the lower ends of the suspension rod 19c and the suspension rod 20c are welded on the corresponding long cantilever protective cover, and the upper ends are hinged to the suspension beam to form a stable suspension structure.

[0057] like Figure 7 , Figure 8 As shown, the channel nozzle 31 includes a top channel nozzle 31a and a side channel nozzle 31b, which are fuel nozzles with flame stabilizers; they are installed at the top and side of the center position of the connecting channel 3, and a number of them are symmetrically arranged according to the shape and size of the connecting channel 3. After the channel nozzle 31 passes through the refractory masonry on the top or side wall of the connecting channel 3, its nozzle is exposed to the exhaust gas of the connecting channel 3.

[0058] like Figure 2 , Figure 3 As shown, the bottom nozzle 1 21 is installed on the center seat plate of the support frame 1 25 at the center position of the bottom of the kiln chamber 1, and its outlet extends to the bottom of the roasting zone II of the kiln chamber 1. The bottom nozzle 1 21 and its support seat are provided with a heat insulation protection structure 1 on the outside; the bottom nozzle 1 22 is installed on the center seat plate of the support frame 26 at the center position of the bottom of the kiln chamber 2 2, and its outlet extends to the bottom of the roasting zone II of the kiln chamber 2 2. The bottom nozzle 2 22 and its support seat are provided with a heat insulation protection structure 2 24 on the outside. The structures of the bottom nozzle 1 21 and the external heat insulation protection structure 1 23 are exactly the same as those of the bottom nozzle 2 22 and the external heat insulation protection structure 2 24.

[0059] The bottom nozzle 1 21 and the bottom nozzle 2 22 are both composed of a fuel delivery conduit 41, a conduit protection sleeve 42, a fuel distributor and a fuel nozzle 48. The fuel is sprayed into the kiln chamber through the delivery conduit 41, the fuel distributor and the fuel nozzle 48 and burns under the assistance of cooling air.

[0060] The fuel delivery duct 41 of the bottom nozzle 1 21 and the bottom nozzle 2 22 and the duct protection sleeve 42 are supported by a plurality of longitudinally evenly distributed ribs 43 to form a sleeve support column, and the lower end of the sleeve support column is fixed on the central seat plate of the corresponding support frame 1 25 and the support frame 2 26. The gap between the ribs 43 in the support seat is a natural convection layer of air, and the fuel delivery duct 41 is connected to the fuel distributor to transport the fuel to the fuel nozzle 48 through the fuel distributor.

[0061] The fuel distributor in the bottom nozzle 1 21 and the bottom nozzle 2 22 is provided with a plurality of fuel nozzle interfaces arranged radially and evenly on the side, and the fuel inlet and the nozzle interface are perpendicular to each other. The fuel distributor is composed of a disc-shaped porous member 44, a conical interface 45, an end cover 46, and a countersunk bolt 47. The conical interface 45 and the disc-shaped porous member 44 are welded or cast to form an integrated structure. The disc-shaped porous member 44 is connected to the fuel delivery conduit 41 by welding, and the end cover 46 and the disc-shaped porous member 44 are detachably connected by a countersunk bolt 47.

[0062] One end of the fuel nozzle 48 of the bottom nozzle 1 21 and the bottom nozzle 2 22 is screwed into the disc-shaped porous part 44 through a thread, and the other end is provided with a mounting clip and a notch. The outer end of the fuel nozzle 48 passes through the refractory protective layer and is flush with the end surface of the refractory protective layer, with the notch facing downward to prevent the material blocks from blocking the nozzle.

[0063] like Figure 2 As shown, the specific structures of the heat insulation protection structure 1 23 and the heat insulation protection structure 2 24 are as follows:

[0064] 1) A refractory insulation layer 51 and a refractory brick protective layer 52 are provided on the outer side of the support seat of the bottom nozzle 1 21 and the bottom nozzle 2 22. The refractory brick protective layer 52 is a three-dimensional interlocking structure with convex-concave interlocking between the upper and lower layers, convex-concave interlocking between the circumferential direction, and convex-concave interlocking between the radial direction (such as Figure 4-Figure 6 shown).

[0065] 2) An annular gap is left between the fuel nozzle 48 and the nozzle brick 53, and is densely filled with a flexible refractory filler 54; the nozzle brick 53 and the upper and lower refractory brick layers are interlocked with each other, and the outer bottom of the nozzle brick 53 has a notch.

[0066] 3) A cone and a material distribution cone cap composed of fired refractory bricks are provided at the top of the bottom nozzle 1 21 and the bottom nozzle 2 22. The fired refractory bricks 55, 56, and 57 are interlocked with each other. The lower groove of the bottom fired refractory brick 55 is engaged with the boss of the burner brick 53 and the heat-resistant steel positioning ring 58 welded on the end cover 46 to form a convex-concave interlocking structure. The material distribution cone cap is a conical refractory prefabricated block 59, including a conduit 60 with an anchor and an anchor hook. The upper section 61 of the anchor hook is provided in the refractory prefabricated block 59. After the lower section 62 of the anchor hook is aligned with the heat-resistant steel pull ring 63 welded on the top cover 46, an amorphous refractory castable 64 is poured into the internal space of the material distribution cone cap (surrounded by the fired refractory bricks 55, 56, 57 and the refractory prefabricated block 59) through the conduit 60 with the anchor. After solidification, it becomes a material distribution cone with a solid overall structure.

[0067] Support frame 1 25 and support frame 2 26 are installed at the bottom of the corresponding kiln chamber, and are used to install bottom nozzle 1 21, bottom nozzle 22 and bear the pressure of the material in the kiln; bottom nozzle 1 21, bottom nozzle 22 and thermal insulation protection structure 1 23, thermal insulation protection structure 2 24 are installed on the support seats in the center of support frame 1 25 and support frame 2 26, and discharge machine 1 27 and discharge machine 2 28 are installed on the outer side of the bottom of the support seat respectively.

[0068] Figure 1 , Figure 7 The arrow direction shown in the figure represents the flow direction of the gas medium when the kiln chamber 1 is a parallel-current roasting kiln chamber and the kiln chamber 2 is a counter-current roasting and heat storage kiln chamber.

[0069] The utility model discloses a double-chamber vertical kiln with auxiliary nozzles, wherein the kiln chamber 1 and the kiln chamber 2 work in an alternating cycle: when the kiln chamber 1 is used as a "parallel flow roasting" kiln chamber, the kiln chamber 2 is used as a "countercurrent roasting and heat storage" kiln chamber, after a certain period of time, the functions of the two kiln chambers are interchanged, that is, when the kiln chamber 2 is used as a "parallel flow roasting" kiln chamber, the kiln chamber 1 is used as a "countercurrent roasting and heat storage" kiln chamber, and the corresponding various media change direction accordingly; the block limestone raw material is preheated, roasted and cooled from top to bottom in the kiln chamber to complete the roasting process, and the product lime is intermittently discharged through the discharger 1 27 and the discharger 2 28.

[0070] Table 1 shows the working states of the spray gun 1 15, spray gun 2 16, bottom nozzle 1 21, bottom nozzle 2 22, and channel nozzle 31 of a double-chamber vertical kiln with auxiliary nozzles in two roasting modes described in the utility model:

[0071] Table 1

[0072]

[0073] The fuel used in normal roasting mode generally has a calorific value of not less than 1600×4.184kJ / m 3gas fuel, or liquid fuel and powdered particle fuel that meets the requirements.

[0074] The fuel used in the overall heating mode generally has a calorific value lower than 1600×4.184kJ / m 3 Low calorific value fuels, such as blast furnace gas, converter gas, mixed gas and other fuels; or when the calorific value of the fuel is not considered and the overall temperature of the roasting zone needs to be increased.

[0075] The majority of fuel in Table 1 refers to fuel that accounts for 80% to 95% of the total amount of fuel, and the minority of fuel refers to fuel that accounts for 5% to 20% of the total amount of fuel.

[0076] The very small amount of air supplied to cool the nozzle as described in Table 1 means that the amount of air supplied is less than the amount of fuel supplied to the bottom nozzle.

[0077] When the double-chamber vertical kiln with auxiliary nozzles described in the utility model adopts the normal roasting mode, it is realized through the following working process:

[0078] In the parallel-current roasting kiln chamber (such as kiln chamber 1): the feed gate 9 is in a closed state, most of the fuel enters the kiln chamber 1 from the spray gun 15, and the combustion air enters the kiln chamber 1 from the combustion air duct 4 through the air / exhaust gas reversing gate 13 on the kiln top (the air inlet a is open and the exhaust gas outlet b is closed) and flows downward into the preheating zone. The preheated combustion air and the fuel are mixed and burned in the roasting zone, and the high-temperature gas produced and the decomposed CO2 gas flow downward in the same direction as the material for parallel roasting. Near the junction of the roasting zone and the cooling zone, it merges with the lime cooling air flowing from bottom to top (the lime cooling air of the kiln chamber 1 enters the kiln chamber 1 from the cooling air duct 29 at the bottom of the kiln) and the very small amount of cooling air sent into the bottom nozzle 21 through the fuel delivery duct 41, and the slightly cooled high-temperature exhaust gas enters the annular channel of the countercurrent roasting and heat storage kiln chamber (kiln chamber 2) through the annular channel of the kiln chamber 1 and the connecting channel 3.

[0079] In the countercurrent roasting and heat storage kiln chamber (such as kiln chamber 22): during the feeding process, the feed gate 210 is in an open state, and the vibrating feeder 28 cooperates with the rotary distributor 212 to distribute the ore loaded into the top hopper 6 into the preheating zone of the kiln chamber 22 in batches; the lime cooling air of the kiln chamber 22 enters the kiln chamber 22 from the cooling air duct 230 at the bottom of the kiln; at the junction of the roasting zone and the cooling zone, a small amount of fuel sprayed into the kiln chamber 22 through the bottom nozzle 22 of the fuel delivery duct 41 burns and releases heat under the assistance of the lime cooling air flowing from bottom to top, and while the cooling air is heated, it rises in countercurrent and enters the central part of the roasting zone of the kiln chamber 22, while the high-temperature exhaust gas from the kiln chamber 1 flows out. Entering the peripheral part of the roasting zone of kiln chamber 22 from the annular channel of kiln chamber 2, two air flows flow upward in parallel with the material flow in the opposite direction to realize overall countercurrent roasting and heat storage; the high-temperature exhaust gas flow merges with the spray gun cooling air entering the kiln from spray gun 216 in kiln chamber 22 and enters the preheating zone, undergoing a large amount of heat exchange with the material to replenish the heat taken away by the combustion air during the previous parallel roasting cycle, and at the same time being cooled by the cold materials continuously distributed into the kiln chamber 22, reducing temperature fluctuations. After being cooled to a lower temperature, the low-temperature exhaust gas is discharged from the air / exhaust gas reversing gate 214 of the kiln chamber 2 (the air inlet a is closed and the exhaust gas outlet b is opened), and is discharged into the atmosphere by the smoke exhaust fan after dust removal and purification.

[0080] When the double-chamber vertical kiln with auxiliary nozzles described in the utility model adopts the overall heating mode, it is realized through the following working process:

[0081] In the parallel-current roasting kiln chamber (such as kiln chamber 1): the feed gate 9 is in a closed state, most of the fuel enters the kiln chamber 1 from the spray gun 15, and the combustion air enters the kiln chamber 1 from the combustion air duct 4 through the kiln top air / exhaust gas reversing gate 13 (air inlet a is open, exhaust gas outlet b is closed) and flows downward into the preheating zone. The preheated combustion air and fuel are mixed and burned in the roasting zone, and the high-temperature gas produced and the decomposed CO2 gas flow downward in the same direction as the material for parallel roasting. Near the junction of the roasting zone and the cooling zone, after merging with the lime cooling air flowing from bottom to top (the lime cooling air of the kiln chamber 1 enters the kiln chamber 1 from the cooling air duct 29 at the bottom of the kiln) and the very small amount of cooling air sent into the bottom nozzle 21 through the fuel delivery duct 41, the slightly cooled high-temperature exhaust gas enters the annular channel of the countercurrent roasting and heat storage kiln chamber (kiln chamber 22) through the annular channel of the kiln chamber 1 and the connecting channel 3.

[0082] At the connecting channel 3 between kiln chamber 1 and kiln chamber 2, fuel is sprayed into the exhaust gas from the roasting kiln chamber (kiln chamber 1) through the top channel nozzle 31a and the side channel nozzle 31b, and burns and releases heat under the assistance of the cooling air in the exhaust gas (most of the air in the exhaust gas comes from the cooling air for cooling the lime in the roasting kiln chamber and a very small amount of excess combustion-supporting air in the combustion products), thereby increasing the temperature of the exhaust gas entering the countercurrent roasting and heat storage kiln chamber (kiln chamber 2) and the surrounding areas.

[0083] In the countercurrent roasting and heat storage kiln chamber (such as kiln chamber 22): during the feeding process, the feed gate 210 is in an open state, and the vibrating feeder 28 cooperates with the rotary distributor 212 to distribute the ore loaded into the top hopper 6 into the preheating zone of the kiln chamber 22 in batches; the lime cooling air of the kiln chamber 22 enters the kiln chamber 22 from the cooling air duct 230 at the bottom of the kiln; at the junction of the roasting zone and the cooling zone, a small amount of fuel sprayed into the kiln chamber 22 through the bottom nozzle 22 of the fuel delivery duct 41 burns and releases heat under the assistance of the lime cooling air flowing from bottom to top, and while the cooling air is heated, it rises in countercurrent and enters the center of the roasting zone of the kiln chamber 22, and the high temperature heated by the channel nozzle 31 from the kiln chamber 1 The warm exhaust gas flows from the annular channel of the kiln chamber 2 into the peripheral part of the roasting zone of the kiln chamber 2, and the two air flows upward in parallel and countercurrently with the material flow, realizing overall countercurrent roasting and heat storage; the high-temperature exhaust gas flows into the preheating zone by merging with the spray gun cooling air from the spray gun 16 in the kiln chamber 2, and exchanges a large amount of heat with the material to replenish the heat taken away by the combustion air during the parallel roasting in the previous cycle, and is cooled by the cold materials continuously distributed in the kiln chamber 2, reducing temperature fluctuations. After being cooled to a lower temperature, the low-temperature exhaust gas is discharged from the air / exhaust gas reversing gate 2 14 of the kiln chamber 2 (the air inlet a is closed and the exhaust gas outlet b is opened), and is discharged into the atmosphere by the smoke exhaust fan after dust removal and purification.

[0084] In the above two roasting modes:

[0085] 1) The bottom nozzle 21 in the parallel-current roasting kiln chamber (such as kiln chamber 1) does not participate in the countercurrent roasting to avoid the lime that has been roasted near the inlet and outlet of the annular channel from being blocked by the local high temperature, and only a very small amount of air cooling nozzle is introduced;

[0086] 2) The bottom nozzle 22 in the countercurrent roasting and heat storage kiln chamber (such as kiln chamber 22) is used in both roasting modes. Its function is to heat the countercurrent rising air and increase the temperature of the roasting zone and the central part of the preheating zone in the kiln chamber 22 by injecting a small amount of fuel into the kiln chamber 22 under the combustion support of the cooling air in the kiln chamber 22, so as to change the material from a cooled state to a heated state, realize the countercurrent roasting and heat storage of the material in the central part, and make the temperature of the central and peripheral cross sections uniform, while reducing the consumption of combustion air and reducing the emission of exhaust gas; because the temperature of the material in the central part is increased, the preheating temperature of the combustion air is also increased, which promotes the rapid decomposition of the material in the central part during the next cycle of parallel roasting, improves the product quality, and reduces the heat consumption;

[0087] 3) The channel nozzle 31 is only used in the overall temperature rise roasting mode. Its function is to spray fuel into the exhaust gas from the roasting kiln chamber, and burn and release heat with the help of the cooling air in the exhaust gas, thereby increasing the temperature of the exhaust gas entering the countercurrent roasting and heat storage kiln chamber and the surrounding areas, and promoting the countercurrent roasting and heat storage of the materials in the surrounding areas; the channel nozzle 31 and the bottom nozzle 22 supply heat synchronously to increase the overall temperature of the roasting zone, and overall promote the rapid decomposition of materials during the next cycle of parallel roasting, improve product quality, and reduce heat consumption.

[0088] The double-bore vertical kiln with auxiliary nozzles described in the utility model is particularly suitable for large-scale double-bore vertical kilns of 800tpd and 1000tpd or more. The fuel used is gas fuel or liquid fuel and powdered particle fuel that meet the requirements. Through the normal roasting mode or the overall heating mode, the low-temperature area of ​​the roasting belt of the heat storage kiln chamber is eliminated, the overall temperature of the roasting belt is increased, and the rapid decomposition of materials during parallel roasting is promoted. Under the same conditions, the height of the roasting belt can be 8% to 12% lower than that of the traditional double-bore vertical kiln.

[0089] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double-bore vertical kiln with an auxiliary nozzle, comprising a first kiln chamber and a second kiln chamber, wherein the first kiln chamber and the second kiln chamber have the same circular cross-section, and a spray gun and a spray gun protection cover are arranged at the upper part of the first kiln chamber and the second kiln chamber; an annular channel is arranged at the middle and lower parts of the first kiln chamber and the second kiln chamber, and the tops of the two annular channels are connected through a connecting channel; the double-bore vertical kiln is also provided with an auxiliary nozzle; and the characteristics are as follows: The auxiliary nozzles include bottom nozzles and channel nozzles; there are two bottom nozzles, which are respectively installed on support seats located at the centers of the bottoms of two kiln chambers, and the spray outlets of the bottom nozzles extend to the bottom of the roasting zone; there are multiple channel nozzles, which are respectively installed on the top and side of the center position of the connecting channel.

2. A double-chamber vertical kiln with auxiliary nozzles according to claim 1, characterized in that: The bottom nozzle is composed of a fuel delivery conduit, a conduit protection sleeve, a fuel distributor and a fuel nozzle; the fuel delivery conduit and the conduit protection sleeve are connected by a plurality of ribs arranged at intervals along the longitudinal direction to form a sleeve support column; the bottom of the sleeve support column is fixedly connected to a central seat plate arranged on a corresponding kiln chamber bottom support frame; the annular gap in the sleeve support column is a natural convection layer of air; the top end of the fuel delivery conduit is connected to the fuel inlet at the bottom of the fuel distributor, and a plurality of radial nozzle interfaces are evenly arranged on the side of the fuel distributor, and the fuel nozzles are arranged at the nozzle interfaces one by one.

3. A double-chamber vertical kiln with auxiliary nozzles according to claim 2, characterized in that: The fuel distributor is composed of a disc-shaped porous member, a conical interface and an end cover; a plurality of nozzle interfaces are arranged along the circumferential direction on the outer side of the disc-shaped porous member, a fuel inlet is arranged at the bottom of the disc-shaped porous member, and the fuel inlet is connected to the fuel delivery conduit through the conical interface; the top of the disc-shaped porous member is closed by the end cover; the fuel nozzle is connected to the nozzle interface of the disc-shaped porous member through a thread.

4. A double-chamber vertical kiln with auxiliary nozzles according to claim 2, characterized in that: A heat insulation protection structure is provided at the bottom nozzle, wherein: A refractory heat insulation layer and a refractory brick protective layer are arranged on the outside of the bottom nozzle. The refractory brick protective layer is a three-dimensional interlocking structure with convex-concave interlocking between the upper and lower layers, convex-concave interlocking between the circumferential direction, and convex-concave interlocking between the radial direction; a nozzle brick is arranged on the outside of the fuel nozzle, and an annular gap is left between the fuel nozzle and the nozzle brick, which is densely filled with flexible refractory fillers; the nozzle brick and the refractory brick layers above and below it are interlocked with convex-concave, and a notch is arranged at the bottom of the outer end of the nozzle brick; A frustum and a dividing cone cap composed of multiple layers of fired refractory bricks are arranged on the top of the fuel nozzle, and the layers of fired refractory bricks have a convex-concave interlocking structure; the bottom groove of the lowest layer of fired refractory bricks is clamped with the boss on the corresponding side of the burner brick and the heat-resistant steel positioning ring welded on the top of the end cover to form a convex-concave interlocking structure; a dividing cone cap is arranged on the top of the frustum, and the dividing cone cap is a refractory prefabricated block with a conduit and an anchor hook inside, which is connected to the heat-resistant steel pull ring welded on the top cover through the anchor hook to form a hollow cone structure, and amorphous refractory injection material is poured into the hollow cone through the conduit to form a dividing cone with an integrated structure.

5. A double-chamber vertical kiln with auxiliary nozzles according to claim 1, characterized in that: The channel nozzle is a fuel nozzle with a flame stabilizer; a plurality of channel nozzles are symmetrically arranged on the top and sides of the connecting channel with the central axis of the connecting channel as the symmetry axis, and the injection end of the channel nozzle passes through the refractory masonry on the top and side of the connecting channel and extends into the connecting channel.

6. A double-chamber vertical kiln with auxiliary nozzles according to claim 1, characterized in that: A top hopper is provided above the double-chamber vertical kiln, and rotary distributors are provided below the feed port of both kiln chamber one and kiln chamber two; two discharge ports are symmetrically provided on the top hopper, which are respectively connected to the rotary distributor in kiln chamber one and the rotary distributor in kiln chamber two through corresponding vibrating feeders.

7. A double-chamber vertical kiln with auxiliary nozzles according to claim 6, characterized in that: The rotary distributor includes a shell, a reduction motor, a shaft, a funnel and a stone spreading plate. The shell is a cylindrical structure and is installed at the center of the kiln top. A feed gate is installed on the upper side of the shell, and the bottom of the shell is directly and sealedly connected to the corresponding kiln chamber. The reduction motor is installed outside the shell, connected to the funnel and the stone spreading device through the shaft, and drives the funnel and the stone spreading plate to rotate synchronously. The shell and the shaft are sealed.

8. A double-chamber vertical kiln with auxiliary nozzles according to claim 1, characterized in that: The spray gun and the spray gun protection cover are suspended in the corresponding kiln chamber through a hanging structure; when the spray gun protection cover is a long cantilever structure, its fixed end is welded to the kiln shell, and the cantilever end is connected to the hanging structure; the hanging structure consists of a hanging beam, a guide support, a hanging rod, and a cork filler; the hanging beam is arranged above the spray gun protection cover, and consists of a plurality of beams arranged radially from the center; the guide support is welded to the inner wall of the kiln shell; the outer end of the beam is placed on the guide support and is radially slidably connected to the support, an expansion joint is left between the beam and the inner wall of the kiln shell, and the expansion joint is filled with cork filler; the lower end of the hanging rod is fixed to the spray gun protection cover, and the upper end of the hanging rod is hinged to the hanging beam to form a hanging structure.

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