Tail heat recycling assembly and energy-saving kiln

Abstract

The utility model discloses a tail heat recycling assembly and an energy-saving kiln, the tail heat recycling assembly is arranged at a slow cooling section of the kiln, and the tail heat recycling assembly comprises a roller way used for conveying sintered products; the indirect cooling module is arranged above the roller way, the indirect cooling module comprises a plurality of slow cooling pipes, the two ends of each slow cooling pipe are connected with a tail heat air inlet unit and a waste heat air outlet unit respectively, the adjacent slow cooling pipes are arranged in a staggered mode in the vertical direction, and all the slow cooling pipes have at least two different airflow directions along the width of the kiln; and the air draft module is arranged above the roller way, and the air draft module is located at the conveying downstream of the roller way. The low-grade tail hot air is used as an indirect cooling heat exchange air source, so that the temperature of waste heat is higher, the air volume is larger, the waste heat is very suitable for being used as a heat source of an energy consumption assembly, the uniformity of temperature fields of the active side and the passive side of the kiln can be ensured, uniform heat exchange of cooling air is facilitated, and the cooling effect of a slow cooling section is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of kilns, and particularly relates to a tail heat recovery and utilization assembly and an energy-saving kiln. Background Art

[0002] In the ceramic industry, ceramic products need to be sintered at high temperature and cooled and shaped through a kiln. During the firing process, ceramic products need to absorb heat, while heat needs to be released during the cooling process. In order to improve the cooling efficiency, the ceramic products can be cooled by adopting a segmented cooling method according to the characteristics of the ceramic products. The cooling zone of existing horizontal kilns (such as roller kilns and tunnel kilns) is generally subdivided into a rapid cooling section, a slow cooling section and a direct cooling section. Among them, the rapid cooling section is the first cooling stage after high-temperature firing, the slow cooling section is the second cooling stage, and the direct cooling section is the third cooling stage.

[0003] The slow cooling section, as a slow cooling chamber for ceramic products, is an air flow channel surrounded by a left kiln wall, a right kiln wall, a kiln top and a kiln bottom, and is arranged between the rapid cooling section and the direct cooling section. Firewalls are arranged under the roller paths at the front and rear of the slow cooling section, and fire damper plates are arranged on the roller paths. The front damper plate can adjust the speed of the cooling air entering from the rapid cooling section, and the tail damper plate can adjust the amount of the cooling air entering from the direct cooling section.

[0004] The ceramic products just coming out of the firing section and entering the rapid cooling section are still in a high-temperature molten state. A large amount of low-temperature air is injected through upper and lower air injection pipes in the rapid cooling section to directly cool the ceramic products. The air in the rapid cooling section sequentially flows into the slow cooling section and moves together with the ceramic products. During this process, the air and the ceramic products continuously conduct convective heat transfer. The temperature of the ceramic products gradually decreases, and the temperature of the cooling air gradually increases, resulting in a gradual reduction in the temperature difference between the cooling air and the ceramic products. After entering the slow cooling section, the temperature of the cooling air approaches that of the ceramic products. Due to the density difference, most of the cooling air flows above the roller path, and a small part of the cooling air flows below the roller path, making the cooling air almost lose its cooling capacity. Content of the Utility Model

[0005] The utility model aims to provide a tail heat recovery and utilization assembly, which can improve the cooling effect of the slow cooling section and achieve the purpose of energy saving at the same time.

[0006] The tail heat recovery and utilization assembly according to the first aspect embodiment of the utility model is arranged in the slow cooling section of the kiln and includes:

[0007] A roller path for conveying the fired products;

[0008] An indirect cooling module is arranged above the roller, and the indirect cooling module includes a plurality of slow cooling pipes, each of which is connected to a tail heat air inlet unit and a waste heat air outlet unit at both ends, and adjacent slow cooling pipes are staggered in the up-down direction, and all slow cooling pipes have at least two different airflow directions along the width of the kiln;

[0009] The exhaust module is arranged above the roller conveyor and is located downstream of the conveying of the roller conveyor.

[0010] The tail heat recovery assembly according to the embodiment of the utility model has at least the following beneficial effects:

[0011] 1. The tail heat air inlet unit uses low-grade tail hot air as the inter-cooling heat exchange air source. After the cooling air in the slow cooling section and the low-grade tail hot air in the slow cooling pipe undergo inter-cooling heat exchange, the cooling air after heat exchange sinks and continues to undergo convection heat exchange with the fired products transported on the roller. At the same time, the cooling air continuously flows to the downstream of the slow cooling section under the negative pressure of the exhaust module. Finally, the waste heat air outlet unit and the exhaust module merge the collected waste heat air into the waste heat main pipe. Since the tail heat air inlet unit uses low-grade tail hot air as the inter-cooling heat exchange air source, compared with the technical means of directly using natural wind as the inter-cooling heat exchange air source, the wind temperature in the waste heat main pipe is higher and the air volume is larger, which is very suitable as the combustion-supporting air of the kiln firing section combustion system or the drying heat source of the drying kiln and the glaze line drying kiln, so as to achieve the purpose of energy saving and emission reduction.

[0012] 2. Adjacent slow cooling tubes are staggered in the up and down directions to arrange more slow cooling tubes in a limited space, so that the intercooling module can simultaneously perform intercooling heat exchange with the air in the kiln at different heights, thereby increasing the heat exchange area and the turbulence effect on the air in the kiln. Moreover, since all the slow cooling tubes have at least two different airflow directions along the width of the kiln, a part of the slow cooling tubes have an airflow direction from the active side to the passive side of the kiln, and the remaining slow cooling tubes have an airflow direction from the passive side to the active side of the kiln, so as to ensure the uniformity of the temperature field on the active and passive sides of the kiln, which is beneficial to the uniform heat exchange of the cooling air and improves the cooling effect of the slow cooling section, thereby offsetting the negative impact of low heat exchange efficiency caused by using low-grade tail hot air as the intercooling heat exchange air source.

[0013] According to some embodiments of the utility model, specifically, all the slow cooling tubes have two different airflow directions, and all the slow cooling tubes are divided into a first heat exchange tube and a second heat exchange tube according to the different airflow directions, and the first heat exchange tube and the second heat exchange tube are arranged alternately along the conveying direction of the roller; or, the first heat exchange tube and the second heat exchange tube are arranged sequentially along the conveying direction of the roller.

[0014] According to some embodiments of the present utility model, in order to further improve the heat exchange effect, the number of the indirect cooling modules is several, and all the indirect cooling modules are arranged in sequence along the conveying direction of the roller path.

[0015] According to some embodiments of the present utility model, at least one of the tail heat inlet units and at least one of the waste heat outlet units are connected to all the indirect cooling modules. That is to say, all the indirect cooling modules can be commonly connected to one tail heat inlet unit and one waste heat outlet unit; alternatively, different indirect cooling modules are respectively connected to different tail heat inlet units and different waste heat outlet units.

[0016] According to some embodiments of the present utility model, the tail heat inlet unit includes a tail heat supply air pipe and a main supply air pipe that are communicated with each other, and all the slow cooling pipes are communicated with the main supply air pipe. The tail heat supply air pipe takes in air from a low-grade heat source through a first fan, and the low-grade tail heat air sequentially passes through the tail heat supply air pipe and the main supply air pipe, and finally is sent to all the slow cooling pipes.

[0017] According to some embodiments of the present utility model, the slow cooling pipes are respectively connected to both sides of the main supply air pipe in the width direction of the kiln furnace, so that different slow cooling pipes have two different air inlet directions, so as to realize the staggered arrangement of all the slow cooling pipes.

[0018] According to some embodiments of the present utility model, the waste heat outlet unit includes a waste heat exhaust pipe and an exhaust main pipe that are communicated with each other, and all the slow cooling pipes are communicated with the exhaust main pipe. The low-grade tail heat air in all the slow cooling pipes is indirectly cooled and exchanged heat with the cooling air in the slow cooling section and then is centrally transported to the exhaust main pipe. At this time, the hot air in the exhaust main pipe is defined as waste heat air, and the exhaust main pipe transports the waste heat air to other workstations through the waste heat exhaust pipe.

[0019] According to some embodiments of the present utility model, the slow cooling pipes are respectively connected to both sides of the exhaust main pipe in the width direction of the kiln furnace, so that different slow cooling pipes have two different air outlet directions, so as to realize the staggered arrangement of all the slow cooling pipes.

[0020] According to some embodiments of the present utility model, at least one of the slow cooling pipes is provided with an air volume regulator at a position close to the tail heat inlet unit, so as to flexibly adjust according to the temperature and heat exchange amount requirements required at each position in the slow cooling section, so as to meet the process requirements of ceramic production in the slow cooling section.

[0021] The energy-saving kiln according to the second aspect of the present invention comprises a rapid cooling section, a slow cooling section, a direct cooling section, an energy-consuming assembly and the above-mentioned waste heat recovery and utilization assembly, wherein the slow cooling section is located between the rapid cooling section and the direct cooling section, the waste heat air inlet unit takes in air from the direct cooling section, the waste heat air outlet unit and the exhaust module are commonly connected to a waste heat main pipe, and the waste heat main pipe is connected to the energy-consuming assembly.

[0022] The energy-saving kiln according to the embodiment of the utility model has at least the following beneficial effects: under the negative pressure of the exhaust module of the slow cooling section, the rapid cooling air in the rapid cooling section is guided to enter the slow cooling section to perform convective heat exchange on the fired products in the slow cooling section; since the air in the direct cooling section is low-grade tail heat and cannot be directly utilized, the low-grade tail hot air in the direct cooling section can be sucked into the slow cooling pipe as an intercooling heat exchange air source; the cooling air in the slow cooling section and the waste heat air after the intercooling heat exchange are concentrated into the waste heat main pipe; compared with the technical means of directly utilizing natural wind as the intercooling heat exchange air source, the wind temperature in the waste heat main pipe is higher and the air volume is larger, which is very suitable as a heat source for the energy-consuming assembly, for example, as combustion-supporting air for the combustion system of the kiln firing section or as a drying heat source for a drying kiln or a glaze line drying kiln, so as to achieve the purpose of energy saving and emission reduction.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 It is a side view of the tail heat recovery assembly of the embodiment of the utility model;

[0026] Figure 2 It is a front view of the tail heat recovery assembly of the embodiment of the utility model;

[0027] Figure 3 It is a schematic top view of the tail heat recovery assembly of the embodiment of the utility model.

[0028] In the accompanying drawings: 10 - slow cooling section, 100 - roller table, 200 - intermediate cooling module, 300 - exhaust air module, 400 - fired product, 110 - conveying motor, 21 - left kiln wall, 22 - right kiln wall, 23 - kiln roof, 24 - kiln bottom, 310 - exhaust air hood, 320 - exhaust air pipe, 210 - slow cooling pipe, 500 - tail heat inlet air unit, 600 - waste heat outlet air unit, 510 - tail heat supply air pipe, 520 - main air supply pipe, 610 - waste heat outlet air pipe, 620 - main outlet air pipe, 211 - first heat exchange pipe, 212 - second heat exchange pipe, 220 - air volume regulator, 221 - air valve, 222 - regulating plug for cold air supply opening. Detailed implementation manners

[0029] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as a limitation to the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0031] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0033] As Figures 1 to 3As shown in the figure, the tail heat recovery and utilization assembly according to the first aspect embodiment of the present utility model is disposed in the slow cooling section 10 of the kiln. The tail heat recovery and utilization assembly includes a roller table 100, an intermediate cooling module 200, and an air extraction module 300. The roller table 100 is used for conveying the fired product 400. The roller table 100 is arranged in the front-rear direction and has a forward conveying direction. The front and rear ends of the roller table 100 are respectively butted against the direct cooling section and the rapid cooling section of the kiln, so that the fired product 400 can sequentially pass through the rapid cooling section, the slow cooling section 10, and the direct cooling section. For the convenience of description, based on the roller table 100, the side where the conveying motor 110 is arranged is defined as the driving side, and the side opposite to the driving side is defined as the driven side. In this embodiment, the driving side is located on the right side of the driven side, that is to say, the conveying motor 110 is located on the right side of the roller table 100.

[0034] It should be noted that since the kiln is surrounded by the left kiln wall 21, the right kiln wall 22, the kiln top 23, and the kiln bottom 24, in order to fully perform convective heat transfer on the fired product 400 located on the roller table 100, the roller table 100 is respectively arranged at intervals between the kiln top 23 and the kiln bottom 24, so that the upper surface and the lower bottom surface of the fired product 400 can both perform convective heat transfer with the cooling air in the slow cooling section 10. Moreover, since the temperature in the kiln is relatively high and the dust is dense, this environment has a greater negative impact on the conveying motor 110 of the roller table 100. Therefore, the conveying motor 110 can be arranged outside the kiln wall, which can not only extend the service life of the conveying motor 110, but also be conducive to the maintenance and repair of the conveying motor 110.

[0035] It can be understood that the kiln has sealed all the hole positions penetrating inside and outside it to ensure the sealing performance of the kiln and prevent the pollutants in the kiln from diffusing to the outside.

[0036] Such as Figure 1 and Figure 3As shown in the figure, an air extraction module 300 is installed downstream of the conveying direction of the roller path 100. The air extraction module 300 includes an air extraction hood 310, an air extraction pipe 320, and a second fan (not shown in the attached drawings) provided on the air extraction pipe 320. The air extraction module 300 is arranged above the roller path 100 and is used to extract the air in the slow cooling section 10. The rapid cooling section of the kiln is provided with a spray air pipe for directly cooling the fired product 400. The low-temperature cold air sprayed by the spray air pipe enters the slow cooling section 10 along the conveying direction of the fired product 400 under the negative pressure of the air extraction module 300, and forms cooling air for convective heat exchange with the fired product 400 in the slow cooling section 10. During this process, the temperature of the fired product 400 gradually decreases, and the temperature of the cooling air gradually increases, resulting in a gradual reduction in the temperature difference between the cooling air and the fired product 400. Due to the density difference, most of the cooling air flows above the roller path 100, and a small part of the cooling air flows below the roller path 100, causing the cooling air to almost lose its cooling capacity.

[0037] In order to reduce the temperature of the cooling air in the slow cooling section 10, an intermediate cooling module 200 is provided above the roller path 100. The intermediate cooling module 200 includes a plurality of slow cooling pipes 210. All the slow cooling pipes 210 penetrate through the left kiln wall 21 and the right kiln wall 22. Both ends of each slow cooling pipe 210 are respectively connected with a tail heat inlet air unit 500 and a waste heat outlet air unit 600. Specifically, the tail heat inlet air unit 500 includes a tail heat supply air pipe 510 and a main air supply pipe 520 that are connected to each other. The tail heat supply air pipe 510 takes in air from a low-grade heat source through a first fan (not shown in the attached drawings), such as the direct cooling section or other areas with low-grade tail hot air. Subsequently, the low-grade tail hot air is centrally transported to the main air supply pipe 520. Since the temperature of the low-grade tail hot air is relatively low, it generally cannot be directly recycled. Therefore, in the prior art, it is generally directly discharged to the external environment or transported to a desulfurization tower for purification treatment. However, in the present invention, the low-grade tail hot air is centrally transported to the main air supply pipe 520. Although the temperature of the low-grade tail hot air is not high, it is still much lower than the temperature of the cooling air in the slow cooling section 10. Therefore, the low-grade tail hot air can be used for intermediate cooling heat exchange with the cooling air, thereby realizing the cooling of the cooling air.

[0038] In addition, the waste heat outlet air unit 600 includes a waste heat outlet air pipe 610 and a main air outlet pipe 620 that are connected to each other. Both ends of all the slow cooling pipes 210 are respectively connected to the main air supply pipe 520 and the main air outlet pipe 620. At this time, the low-grade tail hot air sequentially passes through the tail heat supply air pipe 510, the main air supply pipe 520, the slow cooling pipe 210, the main air outlet pipe 620, and the waste heat outlet air pipe 610, and is finally transported to the energy consumption assembly as a heat source for use.

[0039] With the above structure, the tail heat inlet air unit 500 utilizes the low-grade tail hot air as the inter-cooling heat exchange air source. After the cooling air in the slow cooling section 10 exchanges inter-cooling heat with the low-grade tail hot air in the slow cooling pipes 210, it is centrally conveyed to the main air outlet pipe 620. The cooled air after heat exchange sinks and continues to conduct convective heat exchange with the fired products 400 conveyed on the roller path 100. At the same time, under the negative pressure of the air extraction module 300, the cooling air continuously flows downstream of the slow cooling section 10. Finally, the waste heat outlet air pipe 610 and the air extraction pipe 320 collect the waste heat air and merge it into the waste heat main pipe (not shown in the drawing). Since the tail heat inlet air unit 500 utilizes the low-grade tail hot air as the inter-cooling heat exchange air source, compared with the technical means of directly using natural air as the inter-cooling heat exchange air source, the air temperature in the waste heat main pipe is higher. Because the temperature of the low-grade tail hot air is higher than that of natural air, when the heat exchanged by both is the same, the inter-cooling air volume using the low-grade tail hot air will be larger, which is very suitable as the heat source of the energy-consuming assembly, such as the combustion-supporting air of the combustion system in the firing section of the kiln or the drying heat source of the drying kiln and the glaze line drying kiln, so as to achieve the purpose of energy conservation and emission reduction.

[0040] In some embodiments of the present invention, in order to further improve the heat exchange effect, several inter-cooling modules 200 are provided. All the inter-cooling modules 200 are arranged in sequence along the conveying direction of the roller path 100. All the inter-cooling modules 200 are connected to at least one tail heat inlet air unit 500 and at least one waste heat outlet air unit 600. That is to say, all the inter-cooling modules 200 can be commonly connected to one tail heat inlet air unit 500 and one waste heat outlet air unit 600; or, different inter-cooling modules 200 are respectively connected to different tail heat inlet air units 500 and different waste heat outlet air units 600. Through the above settings, the cooling air in the slow cooling section 10 can respectively maintain inter-cooling heat exchange with different slow cooling pipes 210 along the flow direction, so as to overall reduce the temperature in the slow cooling section 10, thereby improving the cooling effect on the fired products 400.

[0041] In some embodiments of the present invention, in order to arrange more slow cooling pipes 210 in a limited space, adjacent slow cooling pipes 210 are arranged in a staggered manner in the up and down direction. Since the projections of the slow cooling pipes 210 at different levels on the same horizontal plane may have overlapping parts, compared with the technical solution of single-layer arrangement, the technical solution of up and down layered arrangement can configure a larger number of slow cooling pipes 210, enabling the inter-cooling module 200 to simultaneously conduct inter-cooling heat exchange with the air in the kiln at different heights, increasing the heat exchange area and increasing the turbulence effect on the air in the kiln.

[0042] Although the utility model uses low-grade tail hot air to replace natural air, reducing the temperature difference between the inside and outside of the slow cooling pipe 210 and resulting in a decrease in heat exchange efficiency, the utility model offsets the impact of the reduced heat exchange efficiency by arranging more slow cooling pipes 210. It can be understood that all the slow cooling pipes 210 can be divided into two, three or four layers vertically. When all the slow cooling pipes 210 are divided into two layers, two sequentially arranged slow cooling pipes 210 are used as a circulation unit for circular arrangement; when all the slow cooling pipes 210 are divided into three layers, three sequentially arranged slow cooling pipes 210 are used as a circulation unit for circular arrangement; when all the slow cooling pipes 210 are divided into four layers, four sequentially arranged slow cooling pipes 210 are used as a circulation unit for circular arrangement.

[0043] As Figure 2 shown, in some embodiments of the utility model, all the slow cooling pipes 210 have at least two different air flow directions along the width of the kiln. Specifically, the air supply main pipe 520 is connected to the slow cooling pipes 210 on both sides in the width direction of the kiln, so that different slow cooling pipes 210 have two different air inlet directions, and the air outlet main pipe 620 is connected to the slow cooling pipes 210 on both sides in the width direction of the kiln, so that different slow cooling pipes 210 have two different air outlet directions. Since all the slow cooling pipes 210 have air flow directions from left to right and from right to left respectively, part of the slow cooling pipes 210 have air flow directions from the active side to the passive side of the kiln, and the rest of the slow cooling pipes 210 have air flow directions from the passive side to the active side of the kiln, so as to ensure the uniformity of the temperature field on the active side and the passive side of the kiln, which is beneficial to the uniform heat exchange of the cooling air and improves the cooling effect of the slow cooling section 10.

[0044] Furthermore, all the slow cooling pipes 210 are divided into a first heat exchange pipe 211 and a second heat exchange pipe 212 according to different air flow directions. The first heat exchange pipe 211 and the second heat exchange pipe 212 are arranged alternately along the conveying direction of the roller path 100, that is, any first heat exchange pipe 211 has a second heat exchange pipe 212 adjacent to it. Or, the first heat exchange pipe 211 and the second heat exchange pipe 212 are arranged in sequence along the conveying direction of the roller path 100, that is, all the first heat exchange pipes 211 and all the second heat exchange pipes 212 are arranged separately as a whole. In addition to the above two arrangement methods, an arrangement method different from the above embodiments can also be adopted. However, no matter what arrangement method the first heat exchange pipe 211 and the second heat exchange pipe 212 adopt, they all fall within the protection scope of the utility model.

[0045] In some embodiments of the present utility model, in order to flexibly adjust the temperature and heat exchange requirements needed at various positions of the slow cooling section 10, so as to meet the process requirements of ceramic production in the slow cooling section 10, a air volume regulator 220 is provided at the position of each slow cooling tube 210 close to the tail heat inlet air unit 500. In this embodiment, the air volume regulator 220 can be selected as a air valve 221. The air volume regulator 220 is used to adjust the gas flow rate in each slow cooling tube 210, so as to change the heat exchange efficiency of each slow cooling tube 210.

[0046] In other embodiments, the air volume regulator 220 can also be a combination of a air valve 221 and a cold air inlet regulating plug 222. The cold air inlet regulating plug 222 is used to connect with the natural air duct, so as to provide a certain mixing ratio of natural air for the slow cooling tube 210. By setting the opening degrees of the air valve 221 and the cold air inlet regulating plug 222, the ratio between the tail heat air volume and the natural air volume entering the slow cooling tube 210 can be conveniently adjusted, so as to expand the heat exchange efficiency range of each slow cooling tube 210.

[0047] It can be understood that the present utility model does not limit the number of the air volume regulators 220. The number of the air volume regulators 220 can also be less than the number of the slow cooling tubes 210, and is not limited to the above embodiments.

[0048] In some embodiments of the present utility model, in addition to using metal smooth tubes, the slow cooling tubes 210 can also use finned tubes, corrugated tubes, converging-diverging tubes or twist tubes, so as to further improve the heat exchange efficiency of the slow cooling tubes 210, thereby offsetting the negative impact of low heat exchange efficiency caused by using low-grade tail hot air as the indirect cooling heat exchange air source.

[0049] According to the energy-saving kiln furnace of the second aspect embodiment of the present utility model, it includes the tail heat recovery and utilization assembly according to the first aspect embodiment of the present utility model above, and further includes a rapid cooling section, a slow cooling section 10, a direct cooling section and an energy consumption assembly. The slow cooling section 10 is located between the rapid cooling section and the direct cooling section. The tail heat recovery and utilization assembly is arranged in the slow cooling section 10. The tail heat inlet air unit 500 of the tail heat recovery and utilization assembly takes in air from the direct cooling section. The waste heat outlet air duct 610 and the extraction duct 320 of the tail heat recovery and utilization assembly are jointly connected to a waste heat main pipe. The waste heat main pipe is connected to the energy consumption assembly. The energy consumption assembly includes but is not limited to the combustion assisting system in the firing section, a drying kiln or a glaze line drying kiln.

[0050] With the above structure, under the negative pressure of the air extraction module 300 in the slow cooling section 10, the rapid cooling air in the rapid cooling section is guided into the slow cooling section 10 to perform convective heat transfer on the fired product 400 in the slow cooling section 10. Since the air in the direct cooling section is low-grade tail heat and cannot be directly utilized, the low-grade tail hot air in the direct cooling section can be sucked into the slow cooling pipe 210 to serve as the inter-cooling heat exchange air source. The cooling air in the slow cooling section 10 and the waste heat air after inter-cooling heat exchange are concentrated and fed into the waste heat main pipe. Compared with the technical means of directly using natural wind as the inter-cooling heat exchange air source, the air temperature in the waste heat main pipe is higher and the air volume is larger, which is very suitable as the heat source of the energy-consuming assembly to achieve the purpose of energy conservation and emission reduction.

[0051] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A tail heat recovery assembly, arranged in the slow cooling section (10) of the kiln, characterized in that: include: A roller conveyor (100) for conveying the fired product (400); An indirect cooling module (200) is arranged above the roller table (100), the indirect cooling module (200) comprising a plurality of slow cooling tubes (210), both ends of each slow cooling tube (210) being respectively connected to a waste heat air inlet unit (500) and a waste heat air outlet unit (600), adjacent slow cooling tubes (210) being staggered in the up-down direction, and all the slow cooling tubes (210) having at least two different airflow directions along the width of the kiln; An air extraction module (300) is arranged above the roller conveyor (100); the air extraction module (300) is located downstream of the conveying of the roller conveyor (100).

2. The tail heat recovery assembly according to claim 1 is characterized in that: All the slow cooling tubes (210) have two different airflow directions. All the slow cooling tubes (210) are divided into a first heat exchange tube (211) and a second heat exchange tube (212) according to the different airflow directions. The first heat exchange tube (211) and the second heat exchange tube (212) are arranged alternately along the conveying direction of the roller (100); or, the first heat exchange tube (211) and the second heat exchange tube (212) are arranged sequentially along the conveying direction of the roller (100).

3. The tail heat recovery assembly according to claim 1 is characterized in that: The number of the intermediate cooling modules (200) is several, and all the intermediate cooling modules (200) are arranged in sequence along the conveying direction of the roller conveyor (100).

4. The tail heat recovery assembly according to claim 3 is characterized in that: All the indirect cooling modules (200) are connected to at least one of the waste heat air inlet units (500) and at least one of the waste heat air outlet units (600).

5. The tail heat recovery assembly according to claim 1 or 4, characterized in that: The tail heat air inlet unit (500) comprises a tail heat air supply pipe (510) and an air supply main pipe (520) which are connected to each other, and all the slow cooling pipes (210) are connected to the air supply main pipe (520).

6. The tail heat recovery assembly according to claim 5 is characterized in that: The air supply main pipe (520) is respectively connected to the slow cooling pipe (210) on both sides in the width direction of the kiln.

7. The tail heat recovery assembly according to claim 1 or 4, characterized in that: The waste heat air outlet unit (600) comprises a waste heat air outlet pipe (610) and an air outlet main pipe (620) which are connected to each other, and all the slow cooling pipes (210) are connected to the air outlet main pipe (620).

8. The tail heat recovery assembly according to claim 7 is characterized in that: The slow cooling pipes (210) are respectively connected to the two sides of the air outlet main pipe (620) in the width direction of the kiln.

9. The tail heat recovery assembly according to claim 1 is characterized in that: At least one of the slow cooling pipes (210) is provided with an air volume regulator (220) at a position close to the tail heat air inlet unit (500).

10. Energy-saving kiln, characterized in that: The waste heat recovery and utilization assembly comprises the waste heat recovery and utilization assembly as claimed in any one of claims 1 to 9, and further comprises: a rapid cooling section, a slow cooling section (10), a direct cooling section and an energy consumption assembly, wherein the slow cooling section (10) is located between the rapid cooling section and the direct cooling section, the waste heat air inlet unit (500) takes in air from the direct cooling section, the waste heat air outlet unit (600) and the exhaust module (300) are commonly connected to a waste heat main pipe, and the waste heat main pipe is connected to the energy consumption assembly.

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