Cement kiln tail gas solid heat exchange separation system

Abstract

The utility model relates to the technical field of cement kiln tail flue gas raw material heat exchange and gas-solid separation, and discloses a cement kiln tail gas-solid heat exchange separation system which comprises a raw material feeding system, a high-temperature dust collector, six stages of cyclones which are connected in series up and down, and a kiln tail air outlet pipe, the outlets of the C1-C6 cyclone cylinders are provided with first to sixth heat exchange pipelines, and each heat exchange pipeline is provided with first to sixth feeding ports; material pipes and bypass pipelines are arranged between the raw material feeding system and the first and second feeding ports, and the two material pipes are provided with electric material valves; and air pipes and electric air valves are respectively arranged between the C1 cyclone cylinder and the high-temperature dust collector as well as between the C1 cyclone cylinder and the kiln tail air outlet pipe. According to the cement kiln tail gas solid heat exchange separation system, the dust content of flue gas exhausted out of the kiln tail can be greatly reduced through the high-temperature dust collector, six-stage heat exchange and seven-stage gas-solid separation or five-stage heat exchange and six-stage gas-solid separation operation of the kiln tail can be achieved, heat consumption of the system is reduced, and the dust content of an outlet is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cement kiln tail flue gas raw material heat exchange and gas-solid separation, in particular to a cement kiln tail gas-solid heat exchange and separation system. Background Art

[0002] At present, the cement industry at home and abroad generally adopts new dry cement process technology. The new dry production line consisting of "five-stage or six-stage preheater + online decomposition furnace + rotary kiln + cooler" is the mainstream cement clinker production line. At present, the outlet temperature of C1 of the five-stage preheater is mostly above 300℃, and the heat consumption of the burning system of most cement production lines is above 720kcBl / kg.cl. Especially in cement plants with low moisture content of raw materials, the heat of the exhaust gas at the kiln tail far exceeds the heat required for drying the raw material mill. The excess heat can be used to reduce the exhaust gas temperature by spraying water or configuring a waste heat power generation system to reduce the exhaust gas temperature. In addition, affected by the gas-solid separation efficiency of the preheater cyclone, the dust concentration at the outlet of the five-stage or six-stage preheater system is generally 50-80g / Nm 3 With the disposal and utilization of alternative fuels, garbage, waste, lightweight ultrafine raw materials, etc. in cement kilns, the proportion of ultrafine dust in the kiln tail preheater will further increase, and the gas-solid efficiency of the preheater cyclone will further decrease, resulting in a further increase in the dust concentration in the flue gas discharged from the preheater. These dusts enter the subsequent process stages with the flue gas, such as the waste heat power generation system, SCR denitrification system, raw material grinding system, and exhaust gas treatment system, and are finally collected by the kiln tail dust collector and recycled to the preheater system as kiln ash for recycling. Compared with the dust at the cyclone outlet, the kiln ash collected by the kiln tail dust collector has a significantly lower temperature, resulting in heat loss.

[0003] In addition, the dust content in the flue gas at the preheater outlet is relatively high, which has a great impact on the subsequent SCR denitrification system and can easily cause blockage of the SCR denitrification system and catalyst poisoning.

[0004] The dust is carried out of the preheater and collected and recycled by the subsequent system, which increases the investment and operation difficulty of the subsequent system, causes heat loss to the preheater system itself, and indirectly increases the heat consumption of the cement kiln system.

[0005] In order to further reduce the heat consumption of the clinker burning system and reduce the amount of fuel used in the cement kiln system, the use of a seven-stage preheater can further reduce the coal consumption of the cement kiln system. However, the use of a seven-stage cyclone combination to form a seven-stage preheater still has the problem of a large amount of dust being brought out of the preheater outlet.

[0006] In order to reduce the heat consumption of the cement kiln system and reduce the dust content carried out of the kiln tail preheater system, a new technical solution is needed. Utility Model Content

[0007] (1) Technical problems solved

[0008] In view of the shortcomings of the existing technology, the utility model provides a cement kiln tail gas-solid heat exchange and separation system to solve the technical problems of high heat consumption of the cement kiln system and high dust content carried out of the kiln tail preheater system.

[0009] (2) Technical solution

[0010] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a cement kiln tail gas-solid heat exchange separation system, comprising:

[0011] A raw meal feeding system and a high-temperature dust collector arranged on one side of the raw meal feeding system, with a high-temperature dust collector air inlet, a high-temperature dust collector air outlet and a high-temperature dust collector ash hopper respectively provided on both sides and the bottom of the high-temperature dust collector, and the high-temperature dust collector air outlet is connected to the kiln tail air outlet pipe;

[0012] The upper and lower cyclones are arranged in series below the high-temperature dust collector, and the upper and lower cyclones are composed of a C1 cyclone, a C2 cyclone, a C3 cyclone, a C4 cyclone, a C5 cyclone and a C6 cyclone;

[0013] A first heat exchange pipe is provided between the air inlet of the high-temperature dust collector and the C1 cyclone, a second heat exchange pipe is provided between the C1 cyclone and the C2 cyclone, a third heat exchange pipe is provided between the C2 cyclone and the C3 cyclone, a fourth heat exchange pipe is provided between the C3 cyclone and the C4 cyclone, a fifth heat exchange pipe is provided between the C4 cyclone and the C5 cyclone, and a sixth heat exchange pipe is provided between the C5 cyclone and the C6 cyclone, and a first feeding port, a second feeding port, a third feeding port, a fourth feeding port, a fifth feeding port, and a sixth feeding port are provided on the first to sixth heat exchange pipes, respectively;

[0014] A bypass pipe (14) is provided between the raw material feeding system (1) and the second feeding port (6-2), and a second electric valve (15) is provided on the bypass pipe (14). A first electric valve (13) is provided between the raw material feeding system (1) and the first feeding port (6-1), and a bypass air pipe (10) is provided between the C1 cyclone (3-1) and the kiln tail air outlet pipe (8). A rotary feeder (9) is provided between the high-temperature dust collector hopper (2-2) and the second feeding port (6-2).

[0015] Preferably, a first electric air valve is provided on the first heat exchange pipe, and a second electric air valve is provided on the bypass air duct.

[0016] Preferably, a decomposition furnace (4) is provided on one side of the upper and lower series cyclones (3), and the decomposition furnace (4) is composed of a seventh pipe (4-1), a lower cone (4-2), a straight section (4-3), an air outlet pipe (4-4), a feed port (4-5) and a tertiary air inlet (4-6).

[0017] Preferably, the feeding port (4-5) is located in the middle and lower part of the straight section (4-3) and above the tertiary air inlet (4-6), and the discharge pipe of the C5 cyclone (3-5) is connected to the feeding pipe (4-5), and the discharge pipe of the C6 cyclone (3-6) is connected to the rotary kiln (7).

[0018] The cement raw meal is fed into the first feeding port through the raw meal feeding system, and passes through the high-temperature dust collector, C1 cyclone, C2 cyclone, C3 cyclone, C4 cyclone, and C5 cyclone in sequence for six-stage heat exchange and seven-stage gas-solid separation, and then enters the decomposition furnace for carbonate decomposition; the flue gas formed in the decomposition furnace carries the decomposed raw meal into the C6 cyclone for gas-solid separation, and the separated flue gas enters the C5 cyclone, C4 cyclone, C3 cyclone, C2 cyclone, C1 cyclone, and high-temperature dust collector in sequence from bottom to top, and is finally discharged from the system through the kiln tail outlet pipe; the raw meal separated by the C6 cyclone enters the rotary kiln for clinker calcination.

[0019] When abnormal operating conditions require that high-temperature flue gas be bypassed to avoid the high-temperature dust collector, the raw meal needs to be fed into the next-stage cyclone (C2 cyclone). Otherwise, the raw meal will be carried out of the system by the flue gas. First, close the first electric material valve, open the second electric material valve, and feed the raw meal into the second feeding port through the bypass material pipe. Then, gas-solid separation is achieved through the C1 cyclone. The separated flue gas is directly fed into the kiln tail outlet pipe through the bypass air duct, effectively preventing the high-temperature flue gas from entering the high-temperature dust collector, allowing the system to continue to operate normally with material. The system switches from six-stage heat exchange and seven-stage gas-solid separation to five-stage heat exchange and six-stage gas-solid separation, and can be used as an ordinary six-stage preheater system. The setting of the first electric material valve can quickly cut off the material and switch the operating mode under abnormal conditions.

[0020] The ash hopper has a certain storage capacity, and a rotary feeder is provided between the ash hopper and the second feeding port of the high-temperature dust collector. The ash hopper storage and the rotary feeder uniformly feed the raw meal intermittently collected by the high-temperature dust collector and stably feed it to the second feeding port, thereby avoiding the adverse effects of intermittent ash discharge from the high-temperature dust collector.

[0021] The utility model can not only further reduce the flue gas temperature of the exhaust gas from the kiln tail preheater and increase the temperature of the material entering the decomposition furnace through six-stage heat exchange and seven-stage gas-solid separation, thereby reducing the heat consumption of the cement kiln system, but also adopt a high-temperature dust collector to replace the traditional cyclone through the top-level gas-solid separation, which can greatly improve the gas-solid separation efficiency and reduce the dust content at the outlet of the preheater system, which is beneficial to reducing the heat loss of dust and is beneficial to subsequent processes such as SCR denitrification system and high-temperature fan wear. At the same time, a bypass air duct is designed between the high-temperature dust collector and the C1 cyclone, and a bypass material pipe is set between the raw material feeding system and the C2 cyclone, which can realize the switching operation between the ignition stage and abnormal high-temperature working conditions, avoid excessively high-temperature flue gas from entering the high-temperature dust collector, resulting in damage to the high-temperature dust collector under abnormal working conditions, and by designing a high-temperature dust collector ash hopper of a certain volume and adding a rotary discharger, the material fed into the next-stage cyclone is uniform and stable, reducing the negative impact of intermittent ash discharge from the high-temperature dust collector.

[0022] Preferably, a first electric damper is provided on the first heat exchange pipe, and a second electric damper is provided on the bypass air duct. The bypass air duct allows the first electric damper to be closed and the second electric damper to be opened when the flue gas entering the high-temperature dust collector is too hot during ignition or under abnormal operating conditions. This prevents the high-temperature flue gas from entering the high-temperature dust collector and instead bypasses it to the kiln outlet duct, thus preventing damage to the high-temperature dust collector caused by excessive flue gas temperatures.

[0023] (3) Beneficial effects

[0024] Compared with the existing technology, the utility model provides a cement kiln tail gas solid heat exchange separation system, which has the following beneficial effects:

[0025] 1. Through six-stage heat exchange and seven-stage gas-solid separation, the temperature of the exhaust gas from the preheater at the kiln tail can be further reduced, the temperature of the material entering the decomposition furnace can be increased, and the heat consumption of the cement kiln system can be reduced.

[0026] 2. The top-level gas-solid separation uses a high-temperature dust collector instead of a traditional cyclone, which can greatly improve the gas-solid separation efficiency, reduce the dust content at the outlet of the preheater system, and help reduce dust heat loss. It is also beneficial to subsequent processes such as the SCR denitrification system and high-temperature fan wear.

[0027] 3. A bypass air duct is designed between the high-temperature dust collector and the C1 cyclone, and a bypass material pipe is set between the raw material feeding system and the C2 cyclone to realize the switching operation between the ignition stage and abnormal high-temperature working conditions, prevent excessively high-temperature flue gas from entering the high-temperature dust collector, and avoid damage to the high-temperature dust collector under abnormal working conditions.

[0028] 4. By designing a high-temperature dust collector ash hopper of a certain volume and adding a rotary discharger, the material fed into the next-level cyclone can be evenly and steadily fed, reducing the negative impact of intermittent ash discharge from the high-temperature dust collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the process structure of the gas-solid heat exchange and separation system of the utility model;

[0030] Figure 2 This is a schematic diagram of the process structure of the improved gas-solid heat exchange and separation system of the utility model;

[0031] Figure 3 This is a schematic diagram of the flow structure of the gas-solid heat exchange and separation system with a bypass air duct of the utility model;

[0032] Figure 4 This is a schematic diagram of the process structure of the gas-solid heat exchange and separation system with a bypass pipe of the utility model;

[0033] Figure 5 This is a schematic diagram of the structure of the decomposition furnace and the flow structure of the bypass air duct and material pipe system of the utility model.

[0034] In the figure: 1. Raw material feeding system; 2. High-temperature dust collector; 2-1. High-temperature dust collector air inlet; 2-2. High-temperature dust collector ash hopper; 2-3. High-temperature dust collector air outlet; 3. Upper and lower series cyclones; 3-1. C1 cyclone; 3-2. C2 cyclone; 3-3. C3 cyclone; 3-4. C4 cyclone; 3-5. C5 cyclone; 3-6. C6 cyclone; 4. Calciner; 4-1. Seventh pipeline; 4-2. Lower cone; 4-3. Straight section; 4-4. Air outlet pipe; 4-5. Feeding port; 4-6. Tertiary air inlet; 5. Connecting air duct; 5-1. First Heat exchange pipe; 5-2, second heat exchange pipe; 5-3, third heat exchange pipe; 5-4, fourth heat exchange pipe; 5-5, fifth heat exchange pipe; 5-6, sixth heat exchange pipe; 6-1, first feeding port; 6-2, second feeding port; 6-3, third feeding port; 6-4, fourth feeding port; 6-5, fifth feeding port; 6-6, sixth feeding port; 7, rotary kiln; 8, kiln tail air outlet pipe; 9, rotary discharger; 10, bypass air duct; 11, first electric air valve; 12, second electric air valve; 13, first electric material valve; 14, bypass material pipe; 15, second electric material valve. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] The utility model provides a technical solution, a cement kiln tail gas solid heat exchange separation system, including: Figure 1 、 Figure 2 , a raw meal feeding system 1, and a high-temperature dust collector 2 arranged on one side of the raw meal feeding system 1, and a high-temperature dust collector air inlet 2-1, a high-temperature dust collector air outlet 2-3, and a high-temperature dust collector ash hopper 2-2 are respectively provided on both sides and the bottom of the high-temperature dust collector 2, and the high-temperature dust collector air outlet 2-3 is connected to the kiln tail air outlet pipe 8;

[0037] The upper and lower cyclones 3 are arranged in series below the high-temperature dust collector 2, and the upper and lower cyclones 3 are composed of a C1 cyclone 3-1, a C2 cyclone 3-2, a C3 cyclone 3-3, a C4 cyclone 3-4, a C5 cyclone 3-5 and a C6 cyclone 3-6;

[0038] A first heat exchange pipe 5-1 is provided between the high-temperature dust collector air inlet 2-1 and the C1 cyclone 3-1, and a second heat exchange pipe 5-2 is provided between the C1 cyclone 3-1 and the C2 cyclone 3-2, and a third heat exchange pipe 5-3 is connected between the C2 cyclone 3-2 and the C3 cyclone 3-3, a fourth heat exchange pipe 5-4 is provided between the C3 cyclone 3-3 and the C4 cyclone 3-4, and a fifth heat exchange pipe 5-5 is connected between the C4 cyclone 3-4 and the C5 cyclone 3-5, and a sixth heat exchange pipe 5-6 is provided between the C5 cyclone 3-5 and the C6 cyclone 3-6, and a first feeding port 6-1, a second feeding port 6-2, a third feeding port 6-3, a fourth feeding port 6-4, a fifth feeding port 6-5, and a sixth feeding port 6-6 are provided on the first heat exchange pipe 5-1 to the sixth heat exchange pipe 5-6 respectively;

[0039] See also Figure 3 、 Figure 4 and Figure 5A bypass material pipe 14 is arranged between the raw material feeding system 1 and the second feeding port 6-2, and a second electric material valve 15 is added to the bypass material pipe 14, and a first electric material valve 13 is arranged between the raw material feeding system 1 and the first feeding port 6-1, and a bypass air duct 10 is arranged between the C1 cyclone 3-1 and the kiln tail air outlet pipe 8, and a rotary discharger 9 is arranged between the high-temperature dust collector hopper 2-2 and the second feeding port 6-2. When abnormal operating conditions require that the high-temperature flue gas be bypassed to avoid the high-temperature dust collector 2, the raw meal needs to be fed into the next-stage cyclone, otherwise the raw meal will be carried out of the system by the flue gas. First, close the first electric material valve 13 and open the second electric material valve 15, and feed the raw meal into the second feeding port 6-2 through the bypass material pipe 14, and then realize gas-solid separation through the C1 cyclone 3-2. The separated flue gas directly enters the kiln tail outlet pipe 8 through the bypass air duct 10, effectively avoiding the high-temperature flue gas from entering the high-temperature dust collector 2, so that the system can still operate normally with material. The system switches from six-stage heat exchange and seven-stage gas-solid separation operation to five-stage heat exchange and six-stage gas-solid separation operation, and can be used as an ordinary six-stage preheater. The storage of materials in the high-temperature dust collector hopper 2-2 and the uniform feeding of the rotary discharger 9 are conducive to feeding the raw materials intermittently collected by the high-temperature dust collector 2 into the second feeding port 6-2 stably and evenly, thereby avoiding the adverse effects of the intermittent ash unloading of the high-temperature dust collector 2. At the same time, the setting of the first electric material valve 13 can quickly cut off the material and switch the working conditions under abnormal working conditions. The utility model can further reduce the temperature of the exhaust gas and flue gas at the end of the kiln preheater and increase the temperature of the material entering the decomposition furnace 4 through six-stage heat exchange and seven-stage gas-solid separation, thereby reducing the heat consumption of the cement kiln system. The high-temperature dust collector 2 can also be used to replace the traditional cyclone through the top-level gas-solid separation, which can greatly improve the gas-solid separation efficiency and reduce the dust content at the outlet of the preheater system, which is conducive to reducing the heat loss of dust and is beneficial to subsequent processes such as the SCR denitrification system and high-temperature fan wear. At the same time, the high-temperature dust collector 1 and A bypass air duct 10 is designed between the C1 cyclone 3-2, and a bypass material pipe 14 is set between the raw material feeding system 1 and the C2 cyclone, which can realize the switching operation between the ignition stage and the abnormal high-temperature working condition, and prevent excessively high-temperature flue gas from entering the high-temperature dust collector 2, causing damage to the high-temperature dust collector 2 under abnormal working conditions. By designing a high-temperature dust collector ash hopper 2-2 with a certain volume and adding a rotary discharger 9, the material fed into the next-level cyclone is uniform and stable, reducing the negative impact of intermittent ash discharge from the high-temperature dust collector.

[0040] The utility model is implemented as follows Figure 1: The raw material feeding system 1 is connected to the first feeding port 6-1, the ash hopper 2-2 of the high-temperature dust collector 2 is connected to the second feeding port 6-2, the discharge pipe of the C1 cyclone 3-1 is connected to the third feeding port 6-3, the discharge pipe of the C2 cyclone 3-2 is connected to the fourth feeding port 6-4, the discharge pipe of the C3 cyclone 3-3 is connected to the fifth feeding port 6-5, the discharge pipe of the C4 cyclone 3-4 is connected to the sixth feeding port 6-6, the discharge pipe of the C5 cyclone 3-5 is connected to the decomposition furnace 4, the discharge pipe of the C6 cyclone 3-6 is connected to the rotary kiln 7, and the chutes between the discharge port of each cyclone cone to the feeding port on the next level air inlet duct all belong to the category of discharge pipes; the air outlet 2-3 of the high-temperature dust collector 2 is connected to the kiln tail outlet pipe 8, and the flue gas is led out of the gas-solid heat exchange and separation system through the kiln tail outlet pipe 8.

[0041] This utility model is optimized for implementation, see Figure 3 A first electric damper 11 is provided on the first heat exchange pipe 5-1, and a second electric damper 12 is provided on the bypass air duct 10. Due to the bypass air duct 10, if the flue gas entering the high-temperature dust collector 2 is too hot during the ignition phase or due to abnormal operating conditions, the first electric damper 11 can be closed and the second electric damper 12 can be opened. This prevents the high-temperature flue gas from entering the high-temperature dust collector 2 and directly bypasses it to the kiln tail air outlet duct 8, thus preventing damage to the high-temperature dust collector 2 caused by the excessive flue gas temperature.

[0042] When abnormal operating conditions require that the high-temperature flue gas be bypassed to avoid the high-temperature dust collector 2, the raw meal needs to be fed into the next-stage cyclone, otherwise the raw meal will be carried out of the system by the flue gas. First, close the first electric material valve 13 and open the second electric material valve 15, and feed the raw meal into the second feeding port 6-2 through the bypass material pipe 14, and then realize gas-solid separation through the C1 cyclone 3-2. The separated flue gas directly enters the kiln tail outlet pipe 8 through the bypass air duct 10, effectively avoiding the high-temperature flue gas from entering the high-temperature dust collector 2, so that the system can still operate normally with material. The system switches from six-stage heat exchange and seven-stage gas-solid separation operation to five-stage heat exchange and six-stage gas-solid separation operation, and can be used as an ordinary six-stage preheater.

[0043] See also Figure 5 A decomposition furnace 4 is provided on one side of the upper and lower series cyclones 3. The decomposition furnace 4 is composed of a seventh pipe 4-1, a lower cone 4-2, a straight section 4-3, an air outlet pipe 4-4, a feed port 4-5, and a tertiary air inlet 4-6. The feed port 4-5 is located in the middle and lower part of the straight section 4-3 and above the tertiary air inlet 4-6. The feed port 4-5 is connected to the feed pipe 4-5 of the C5 cyclone 3-5. The feed pipe of the C5 cyclone 3-5 is connected to the feed pipe 4-5 of the decomposition furnace 4. The preheated raw meal fed into the decomposition furnace 4 is carried by the flue gas through the straight section 4-3 and the air outlet pipe 4-4 in sequence. The flue gas from the decomposition furnace 4 and the decomposed raw meal are brought into the C6 cyclone 3-6 through the seventh pipe 4-1. The raw meal undergoes carbonate decomposition in the decomposition furnace 4.

[0044] See also Figure 1 The bottom of the decomposition furnace 4 is connected to the rotary kiln 7, and the discharge pipe of the C6 cyclone 3-6 is connected to the rotary kiln 7. The cement raw meal is fed into the first feeding port 6-1 through the raw meal feeding system 1, and passes through the high-temperature dust collector 2, C1 cyclone 3-1, C2 cyclone 3-2, C3 cyclone 3-3, C4 cyclone 3-4, and C5 cyclone 3-5 in sequence for six-stage heat exchange and gas-solid separation, and then enters the decomposition furnace 4 for carbonate decomposition; the flue gas formed in the decomposition furnace 4 carries the decomposed raw meal into the C6 cyclone 3-6 for gas-solid separation, and the separated flue gas enters the C5 cyclone 3-5, C4 cyclone 3-4, C3 cyclone 3-3, C2 cyclone 3-2, C1 cyclone 3-1, and high-temperature dust collector 2 in sequence from bottom to top, and is finally discharged from the system through the kiln tail air outlet 8; the raw meal separated by the C6 cyclone 3-6 enters the rotary kiln 7 for clinker calcination.

[0045] The utility model can realize six-stage gas-solid heat exchange and seven-stage gas-solid separation, and utilize the high-temperature dust collector to achieve a significant reduction in the dust content in the flue gas, which is beneficial to reducing the system heat consumption and the dust content in the flue gas, and is beneficial to the wear of subsequent equipment and SCR denitrification; it can also switch to five-stage gas-solid heat exchange and six-stage gas-solid separation when the flue gas is abnormally high in temperature, which can protect the high-temperature dust collector from high-temperature damage. The system can still operate normally with materials and be used as an ordinary six-stage preheater system. It is still the operating route of the current low-energy new dry six-stage preheater system cement production process.

[0046] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cement kiln tail gas-solid heat exchange and separation system, characterized in that: include: A raw material feeding system (1) and a high-temperature dust collector (2) arranged on one side of the raw material feeding system (1), wherein a high-temperature dust collector air inlet (2-1), a high-temperature dust collector air outlet (2-3) and a high-temperature dust collector ash hopper (2-2) are respectively provided on both sides and the bottom of the high-temperature dust collector (2), and the high-temperature dust collector air outlet (2-3) is connected to a kiln tail air outlet pipe (8); The upper and lower cyclones (3) are connected in series and are arranged below the high-temperature dust collector (2), and are composed of a C1 cyclone (3-1), a C2 cyclone (3-2), a C3 cyclone (3-3), a C4 cyclone (3-4), a C5 cyclone (3-5), and a C6 cyclone (3-6); The first heat exchange pipe (5-1) is arranged between the air inlet (2-1) of the high-temperature dust collector (2) and the C1 cyclone (3-1), and a second heat exchange pipe (5-2) is arranged between the C1 cyclone (3-1) and the C2 cyclone (3-2), a third heat exchange pipe (5-3) is arranged between the C2 cyclone (3-2) and the C3 cyclone (3-3), a fourth heat exchange pipe (5-4) is arranged between the C3 cyclone (3-3) and the C4 cyclone (3-4), and the C4 cyclone ( A fifth heat exchange pipe (5-5) is provided between the C5 cyclone (3-4) and the C5 cyclone (3-5), a sixth heat exchange pipe (5-6) is provided between the C5 cyclone (3-5) and the C6 cyclone (3-6), and a first feeding port (6-1), a second feeding port (6-2), a third feeding port (6-3), a fourth feeding port (6-4), a fifth feeding port (6-5), and a sixth feeding port (6-6) are respectively provided on the first heat exchange pipe (5-1) to the sixth heat exchange pipe (5-6); A bypass pipe (14) is provided between the raw material feeding system (1) and the second feeding port (6-2), and a second electric valve (15) is provided on the bypass pipe (14). A first electric valve (13) is provided between the raw material feeding system (1) and the first feeding port (6-1), and a bypass air pipe (10) is provided between the C1 cyclone (3-1) and the kiln tail air outlet pipe (8). A rotary feeder (9) is provided between the high-temperature dust collector hopper (2-2) and the second feeding port (6-2).

2. The cement kiln tail gas-solid heat exchange and separation system according to claim 1, characterized in that: A first electric air valve (11) is provided on the first heat exchange pipe (5-1), and a second electric air valve (12) is provided on the bypass air duct (10).

3. The cement kiln tail gas-solid heat exchange and separation system according to claim 1, characterized in that: A decomposition furnace (4) is provided on one side of the upper and lower series-connected cyclones (3), and the decomposition furnace (4) is composed of a seventh pipe (4-1), a lower cone (4-2), a straight section (4-3), an air outlet pipe (4-4), a feeding port (4-5), and a tertiary air inlet (4-6).

4. The cement kiln tail gas-solid heat exchange separation system according to claim 3, characterized in that: The feeding port (4-5) is located in the middle and lower part of the straight section (4-3) and above the tertiary air inlet (4-6), and the discharge pipe of the C5 cyclone (3-5) is connected to the feeding port (4-5), and the discharge pipe of the C6 cyclone (3-6) is externally connected to the rotary kiln (7).

Images