Rotary air cooling control system for suspended clay calcination

Abstract

The utility model provides a suspended clay calcination rotary air cooling control system, which comprises a decomposing furnace, a rotary air cooling device and a rotary air cooling device, a separation cyclone; the multi-stage suspension preheating cyclone cylinder is used for preheating a clay raw material to be calcined; the fuel pipeline is communicated to the connecting air pipe and is used for feeding fuel; the air pipeline is communicated to the connecting air pipe and is used for feeding air so as to be matched with combustion of fuel fed by the fuel pipeline to eliminate reducing waste gas; the air-cooled rotary cooler comprises a rotary cylinder capable of rotating around a horizontal shaft, a plurality of cooling pipes rotating along with the rotary cylinder are arranged in the rotary cylinder in the axial direction, and the cooling pipes are used for being filled with cooling air so as to achieve non-contact heat exchange between the cooling air and the clay materials. According to the control system provided by the utility model, clay calcination color control can be realized.

Description

Technical Field

[0001] This utility model relates to the field of clay calcination technology, and in particular to a rotary air-cooled control system for calcining suspended clay. Background Technology

[0002] The powdered calcined products formed through calcination vary across different industries. In the cement production industry, calcined clay is a common example.

[0003] Calcined clay possesses many excellent properties, such as high toughness, high compressive strength, and good thermal stability, and is often used to make pottery, porcelain, and other handicrafts. In addition, calcined clay is widely used in medicine, food, chemicals, building materials, and environmental protection.

[0004] In the process of realizing this utility model, the inventors discovered that the prior art has at least the following problems:

[0005] Clay calcination technology, due to its inherent characteristics, does not produce carbon dioxide during calcination; only the fuel itself generates waste gas. Compared to ordinary cement clinker, it can reduce carbon dioxide emissions by 40%, thus its application and promotion are increasingly widespread. However, due to the diversity of clay and its high elemental content, especially iron, it oxidizes to a red color during combustion, unlike traditional cement ash. Therefore, the production process needs to be controlled to ensure the product is gray.

[0006] Therefore, a rotary air-cooled control system for calcining suspended clay is needed to at least partially solve the above-mentioned technical problems. Utility Model Content

[0007] This utility model provides a rotary air-cooled control system for calcining suspended clay, which has a simple structure and can achieve color control during clay calcination.

[0008] This utility model provides a rotary air-cooled control system for calcining suspended clay, the control system comprising:

[0009] A vertical decomposition furnace is used to calcine clay raw materials in a reducing atmosphere;

[0010] A separating cyclone separator is used to separate the high-temperature clay material and reducing waste gas generated from the calcination of clay raw materials in the decomposition furnace;

[0011] A multi-stage suspension preheating cyclone is used to preheat clay raw materials to be calcined; wherein, the bottom inlet of the lowest stage of the multi-stage suspension preheating cyclone is connected to the decomposition furnace via a feeding pipe, and the side inlet of the lowest stage of the multi-stage suspension preheating cyclone is connected to the top outlet of the separation cyclone via a connecting air pipe.

[0012] A fuel pipe connected to the connecting duct is used for feeding fuel;

[0013] An air duct connected to the connecting duct is used to feed in air to cooperate with the combustion of fuel fed in by the fuel duct to eliminate reducing waste gas;

[0014] An air-cooled rotary cooler includes a rotary drum that can rotate around a horizontal axis. Multiple cooling pipes that rotate together with the rotary drum are arranged axially inside the rotary drum. Cooling air is injected into the cooling pipes to achieve non-contact heat exchange between the cooling air and the clay material. The tail of the rotary drum is connected to the discharge port of the separating cyclone through a transfer pipeline.

[0015] According to the control system of this utility model, the clay raw material, after being preheated by a multi-stage suspension preheating cyclone, is calcined in a decomposition furnace under a reducing atmosphere. The iron-containing raw material is converted into Fe3O4, which is grayish-black. Then, the high-temperature clay material, separated by a separation cyclone, enters a wind-cooled rotary cooler. Cooling air is injected through multiple steel pipes fixed inside the wind-cooled rotary cooler, and indirect heat exchange occurs between the cooling air and the calcined clay material. The cooling air is heated to 450°C, while the calcined clay material can be cooled to approximately 100°C. Inside the wind-cooled rotary cooler, the calcined clay material does not come into contact with the cooling air or the outside air, ensuring that the clay material is not oxidized during the cooling process, thus achieving color control of the calcined clay. Simultaneously, the separated reducing gases (generally including CO and H2) are eliminated in the combustion of fuel fed through the fuel pipe and air fed through the air pipe, and can also be used to preheat the clay raw material to be calcined, achieving heat utilization.

[0016] Optionally, the control system further includes a hot air furnace for burning fuel; wherein the hot air furnace is connected to an air inlet at the bottom of the decomposition furnace via a heating pipe to provide the decomposition furnace with clay calcination heat.

[0017] Additional advantages, objects, and features of this invention will be set forth in part in the description which follows, and will in part become apparent to those skilled in the art upon review of the description, or may be learned by practice of the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures specifically pointed out in the description and drawings.

[0018] Those skilled in the art will understand that the objectives and advantages achievable with this invention are not limited to those specifically described above, and that the above and other objectives achievable with this invention will become clearer from the following detailed description. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, do not constitute a limitation thereof. The components in the drawings are not drawn to scale but are merely for illustrating the principles of the present invention. For ease of illustration and description of certain parts of the present invention, corresponding portions in the drawings may be enlarged, i.e., may appear larger relative to other components in an exemplary device actually manufactured according to the present invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall control system according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100. Control system;

[0023] 110. Precipitation furnace; 111. Fuel inlet;

[0024] 120. Separate cyclone separator;

[0025] 130. Multi-stage suspended preheating cyclone separator; 131. Preheating cyclone separator;

[0026] 140. Connecting duct; 141. Fuel pipeline; 142. Air pipeline;

[0027] 150. Air-cooled rotary cooler; 151. Rotary drum; 152. Transfer pipeline;

[0028] 160. Hot air furnace; 161. Heating pipeline;

[0029] 171. First branch; 172. Second branch; 173. Third branch; 174. Fourth branch; 175. Exhaust gas pipeline; 176. Exhaust pipe;

[0030] 181. First airlock valve; 182. Second airlock valve; 183. Material distribution valve. Detailed Implementation

[0031] The objectives and functions of this invention, as well as the methods for achieving these objectives and functions, will be clarified by referring to exemplary embodiments. However, this invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The purpose of this specification is merely to help those skilled in the art to comprehensively understand the specific details of this invention.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0033] The ordinal numbers such as "first" and "second" used in this invention are merely identifiers and have no other meaning, such as a specific order. Furthermore, for example, the term "first component" does not imply the existence of "second component," and the term "second component" does not imply the existence of "first component."

[0034] It should be noted that the terms “up,” “down,” “front,” “back,” “left,” “right,” “inner,” “outer,” and similar expressions used in this article are for illustrative purposes only and are not intended to be limiting.

[0035] This invention provides a rotary air-cooled control system 100 for calcining suspended clay. The control system 100 can be applied, for example, to clay calcination, and can solve the problem of poor color control in existing clay calcination methods.

[0036] In a preferred embodiment, refer to Figure 1 As shown, Figure 1 This is a schematic diagram of the overall control system according to an embodiment of the present invention. The control system 100 provided in this embodiment of the present invention includes a decomposition furnace 110, a separation cyclone 120, a multi-stage suspension preheating cyclone 130, a fuel pipeline 141, an air pipeline 142, and an air-cooled rotary cooler 150.

[0037] The decomposition furnace 110 is used to calcine clay raw materials under a reducing atmosphere, so that the iron in the clay raw materials is converted into Fe3O4 during calcination. The separating cyclone 120 is used for solid-gas separation (separation of clay material and reducing waste gas). The multi-stage suspension preheating cyclone 130 is used to preheat the clay raw materials. Fuel pipe 141 and air pipe 142 feed fuel and air respectively, working together to eliminate the reducing gases generated during clay calcination. The air-cooled rotary cooler 150 is used for non-contact air cooling of the clay material.

[0038] Specifically, the vertical decomposition furnace 110 is used to calcine clay raw materials under a reducing atmosphere. The decomposition furnace 110 is a prior art device well known to those skilled in the art, and its structure will not be described here. For example, fuel can be fed into the decomposition furnace 110 through its own fuel inlet 111, while controlling the amount of fuel input and the fuel air volume. During combustion, the fuel air volume is controlled to be less than the amount required for complete combustion of the fuel, so that a reducing atmosphere of CO and H2 is formed inside the decomposition furnace 110. Under high temperature conditions, the iron in the clay raw material is finally converted into Fe3O4.

[0039] In addition, to provide the heat required for calcining clay raw materials in the decomposition furnace 110, a hot air furnace 160 can be installed to generate heat by burning fuels such as waste. The hot air furnace 160 can be connected to the air inlet at the bottom of the decomposition furnace 110 via a heating pipe 161 to provide the furnace with the heat needed for clay calcination. The temperature inside the decomposition furnace 110 is generally controlled between 700 and 900°C.

[0040] The separating cyclone separator 120 is used to separate the high-temperature clay material and reducing waste gas (CO and H2) generated from the calcination of clay raw materials in the decomposition furnace 110. The separated high-temperature clay material is connected to the air-cooled rotary cooler 150 via a transfer pipeline 152. The separated waste gas can enter the multi-stage suspension preheating cyclone separator 130.

[0041] The multi-stage suspension preheating cyclone 130 is used to preheat the clay raw material to be calcined. The feed inlet of the lowest stage of the multi-stage suspension preheating cyclone 130 is connected to the decomposition furnace 110 via a feed pipe. The feed inlet of the lowest stage of the multi-stage suspension preheating cyclone 130 is connected to the air outlet of the separating cyclone 120 via a connecting air pipe 140.

[0042] Before the reducing waste gases (CO and H2) enter the multi-stage suspension preheating cyclone separator 130, the CO and H2 need to be removed. Therefore, a fuel pipe 141 and an air pipe 142 are connected to the connecting duct 140. Preferably, the fuel pipe 141 and the air pipe 142 are located near the connecting duct 140 of the separating cyclone separator 120. Fuel and sufficient oxygen (air) are fed into the connecting duct 140 through the fuel pipe 141 and the air pipe 142 to ensure that the CO and H2 are completely combusted in an oxidizing atmosphere and thus eliminated.

[0043] Multi-stage suspension preheating cyclone 130 is also a prior art device well known to those skilled in the art, and may include two to five stages of preheating cyclones 131 (the number of stages depends on the moisture content of the clay raw material). For example, after drying and crushing, the clay raw material can be fed into the rising pipe of the uppermost preheating cyclone 131 of the multi-stage suspension preheating cyclone 130 through a clay rotary feeder, and enter the uppermost preheating cyclone 131 through the feed inlet. In the rising pipe connected to each stage of the preheating cyclone 131, the clay raw material exchanges heat with the high-temperature waste gas, and is then collected by the cyclone and enters the next stage of the preheating cyclone 131 through the discharge pipe. This process is repeated, and the material is heated from top to bottom, while the hot waste gas is cooled stage by stage. The preheated high-temperature clay raw material finally enters the decomposition furnace 110 for calcination. The clay raw material in the decomposition furnace 110 undergoes dehydroxylation through high-temperature calcination. Under a reducing atmosphere, impurities, especially iron, in the clay raw material in the decomposition furnace 110 are also reduced to Fe3O4 at high temperatures, resulting in a grayish-black color. The air-cooled rotary cooler 150 includes a rotary cylinder 151 that can rotate around a horizontal axis. Multiple cooling pipes (not shown) are arranged axially inside the rotary cylinder 151 and rotate together with it. For example, the cooling pipes are arranged on the outer ring inside the rotary cylinder 151. Cooling gas, such as cold air, is injected into the cooling pipes to achieve non-contact heat exchange between the cooling gas and the high-temperature clay material. The tail of the rotary cylinder 151 is connected to the discharge port of the separating cyclone 120 via a transfer pipe 152.

[0044] The calcined, high-temperature clay material enters the rotary cooler from the rear. As the cooler rotates, the clay material moves towards the front, exchanging heat with the cooling steel pipes. Cold air flows from the head of the cooler through internal steel pipes to the rear. The hot clay material and cold air exchange heat indirectly inside the cooler, cooling the clay to approximately 100°C while the air absorbs heat to 450°C. Since Fe3O4 oxidizes to Fe2O3 upon contact with oxygen above 300°C, the clay material is kept away from the cooling air and outside air within the cooler, ensuring that it is not oxidized during the cooling process.

[0045] To further improve the heat exchange effect between the high-temperature clay material and the cooling air, preferably, the flow direction of the cooling air in the cooling pipe is opposite to the movement direction of the clay material in the rotating drum 151. Figure 1 Taking the orientation shown as an example, the flow direction of the cooling air in the cooling pipe is from left to right. The movement direction of the clay material in the rotary drum 151 is from right to left.

[0046] Based on the above-described scheme, according to the control system 100 of this utility model embodiment, the clay raw material is calcined in the decomposition furnace 110 under a reducing atmosphere, while ensuring that the iron raw material therein generates Fe3O4. Then, after being separated by the separation cyclone 120, it enters the air-cooled rotary cooler 150. In the air-cooled rotary cooler 150, the calcined clay material does not come into contact with the cooling gas and the outside air, ensuring that the clay material is not oxidized during the cooling process, thus achieving control of the calcined color of the clay. At the same time, the separated reducing gases (generally including CO and H2) are eliminated in the combustion of fuel fed into the fuel pipe 141 and air fed into the air pipe 142, and can also be used to preheat the clay raw material to be calcined, thus realizing heat utilization.

[0047] Continue to refer to Figure 1 In order to enable the clay raw materials to enter the decomposition furnace 110 for calcination in a more reasonable manner, the feeding pipeline may also include a first branch 171 and a second branch 172.

[0048] One end of the first branch 171 and the second branch 172 can be connected to the lower and middle parts of the decomposition furnace 110, respectively. The other end of the first branch 171 and the second branch 172 can be connected to the discharge port of the lowest stage preheating cyclone of the multi-stage suspension preheating cyclone 130 via the material distribution valve 183. The material distribution valve 183 is used to reasonably distribute the proportion of clay raw materials entering the first branch 171 and the second branch 172 according to actual needs, so as to avoid the clay raw materials from concentrating.

[0049] In a preferred embodiment, a first airlock valve 181 may be installed in the transfer pipe 152 connected to the tail end of the rotary drum 151. A second airlock valve 182 may also be installed at the discharge port of the rotary drum 151. This ensures that the rotary cooler itself is airtight and further ensures that the clay material is not oxidized during the cooling process.

[0050] In the illustrated embodiment, the control system 100 according to the present invention may further include an exhaust gas pipeline 175 connected to the outlet of the uppermost preheating cyclone 131 of the multi-stage suspended preheating cyclone 130, for discharging exhaust gas.

[0051] The outlet of the cooling pipe can also be connected to the exhaust pipe 176 to discharge the cooled air after heat exchange. The exhaust pipe 176 can be connected to the third branch 173 and the fourth branch 174 respectively. The third branch 173 can be connected to the waste gas pipe 175, which can be used to send the waste gas to the raw material drying system (existing equipment). The fourth branch 174 can be connected to the hot air furnace 160 for heat recovery.

[0052] Furthermore, according to this control system 100, valves may be installed in the exhaust gas pipeline 175, the exhaust pipe 176, the third branch 173, and the fourth branch 174 for better gas transport or transfer. Fans may also be installed in the exhaust gas pipeline 175 and the exhaust pipe 176.

[0053] The control system 100 according to this embodiment can control the product color during the production process, and can also economically handle the process flow to ensure that CO emissions from waste gas do not exceed the standard. The entire control system 100 has low pressure loss, high heat utilization rate, and recoverable heat, reducing system heat consumption. The calcined clay material produced can partially replace traditional cement clinker, achieving the goal of energy conservation and emission reduction.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A suspension clay calcination rotary air quench control system characterized by, The control system comprises: a vertical decomposing furnace for calcining clay raw materials under a reducing atmosphere; a separation cyclone for separating high-temperature clay materials and reducing exhaust gas generated by the decomposing furnace; a multi-stage suspension preheating cyclone for preheating clay raw materials to be calcined; wherein a discharge port at the bottom of the lowermost stage of the multi-stage suspension preheating cyclone is connected to the decomposing furnace via a discharge pipeline, and an inlet port at the side of the lowermost stage of the multi-stage suspension preheating cyclone is connected to an exhaust port at the top of the separation cyclone via a connecting air duct; a fuel pipeline connected to the connecting air duct for feeding fuel; an air pipeline connected to the connecting air duct for feeding air to cooperate with the fuel fed by the fuel pipeline to burn and eliminate reducing exhaust gas; an air-cooled rotary cooler comprising a rotary cylinder rotatable around a horizontal axis, a plurality of cooling pipes arranged inside the rotary cylinder and rotatable with the rotary cylinder, and a cooling gas filled in the cooling pipes to realize non-contact heat exchange between the cooling gas and the clay materials; wherein a tail of the rotary cylinder is connected to a discharge port of the separation cyclone via a transfer pipeline.

2. The control system of claim 1, wherein, The control system further comprises a hot blast furnace for burning fuel; wherein the hot blast furnace is connected to an air inlet at the bottom of the decomposing furnace via a heat supply pipeline to provide clay calcination heat for the decomposing furnace.

3. The control system of claim 1, wherein, The discharge pipeline comprises a first branch and a second branch. One end of the first branch and the second branch is connected to the lower part and the middle part of the decomposing furnace respectively, and the other end of the first branch and the second branch is connected to the discharge port of the lowermost stage of the multi-stage suspension preheating cyclone via a distribution valve.

4. The control system of claim 1, wherein, The flow direction of the cooling gas in the cooling pipes is opposite to the moving direction of the clay materials in the rotary cylinder.

5. The control system of claim 1, wherein, The tail of the rotary cylinder is further provided with a first air lock valve; and / or The discharge port of the rotary cylinder is further provided with a second air lock valve.

6. The control system of claim 1, wherein, The decomposing furnace is further provided with a fuel inlet to realize a reducing atmosphere in the decomposing furnace.

7. The control system of claim 2, wherein, The control system further comprises at least the following pipelines: an exhaust gas pipeline connected to an exhaust port of the uppermost stage of the multi-stage suspension preheating cyclone for discharging exhaust gas; an exhaust pipeline connected to an exhaust port of the cooling pipes.

8. The control system of claim 7, wherein, The exhaust pipeline is connected to a third branch and a fourth branch respectively, the third branch is connected to the exhaust gas pipeline, and the fourth branch is connected to the hot blast furnace.

9. The control system of claim 8, wherein, Valves are further provided in at least one of the following pipelines: the exhaust gas pipeline; the exhaust pipeline; the third branch; the fourth branch; Fans are further provided in at least one of the following pipelines: the exhaust gas pipeline; the exhaust pipeline.

Images