Calcination tail gas waste heat utilization system and process thereof

Abstract

The waste heat utilization system comprises a first-section waste heat utilization system and a second-section waste heat utilization system, the first-section waste heat utilization system comprises a high-temperature cyclone dust collector, a first-section cooling cyclone dust collection mechanism and a first-section cooling pulse bag-type dust collector, and the second-section waste heat utilization system comprises a high-temperature cyclone dust collector, a second-section cooling cyclone dust collection mechanism and a second-section cooling pulse bag-type dust collector. A discharging port of the high-temperature cyclone dust collector is connected with a feeding port of the first-section cooling cyclone dust collection mechanism, a gas outlet of the first-section cooling cyclone dust collection mechanism is connected with a feeding port of the first-section cooling pulse bag-type dust collector, and a gas outlet of the first-section cooling pulse bag-type dust collector is connected with a blower nozzle of the combustion chamber. The device has the technical effects that tail gas of the first-section waste heat utilization system enters the combustion chamber to serve as combustion-supporting gas, and waste heat enters the calcining system to be recycled; the temperature of the tail gas of the second-section waste heat utilization system is about 50 DEG C, and the tail gas is discharged after being treated by the tail gas treatment mechanism, so that more energy-saving and environment-friendly effects are achieved; two-stage waste heat utilization is adopted, the waste heat of the system can be fully utilized, and the calcination process is green and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat utilization, and particularly relates to a waste heat utilization system for calcination tail gas and a waste heat utilization process for calcination tail gas. Background Art

[0002] In the existing calcination process, the temperature of the calcination tail gas is about 150°C. Generally, there are two ways to treat the tail gas. One is to draw it out by an induced draft fan and discharge it directly into the atmosphere through the tail gas pipe, and nitrogen oxides are also discharged into the atmosphere immediately, which will cause certain pollution to the environment; the other is to directly introduce the calcination tail gas into the warehouse for heating by an induced draft fan, but there are seasonal restrictions and the waste heat cannot be effectively recovered and utilized. Summary of the Invention

[0003] Therefore, the present invention provides a waste heat utilization system and process for calcination tail gas to solve the above problems in the prior art.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] According to the first aspect of the present invention, a waste heat utilization system for calcination tail gas includes a first-stage waste heat utilization system and a second-stage waste heat utilization system. The first-stage waste heat utilization system includes a high-temperature cyclone dust collector, a first-stage cooling cyclone dust removal mechanism, and a first-stage cooling pulse bag filter. The discharge port of the high-temperature cyclone dust collector is connected to the feed port of the first-stage cooling cyclone dust removal mechanism. The gas outlet of the first-stage cooling cyclone dust removal mechanism is connected to the feed port of the first-stage cooling pulse bag filter. The gas outlet of the first-stage cooling pulse bag filter is connected to the air inlet of the combustion chamber;

[0006] The second-stage waste heat utilization system includes a second-stage cooling cyclone dust removal mechanism and a second-stage cooling pulse bag filter. The discharge ports of the first-stage cooling cyclone dust removal mechanism and the first-stage cooling pulse bag filter are both connected to the feed port of the second-stage cooling cyclone dust removal mechanism. The gas outlet of the second-stage cooling cyclone dust removal mechanism is connected to the feed port of the second-stage cooling pulse bag filter. The discharge ports of the second-stage cooling cyclone dust removal mechanism and the second-stage cooling pulse bag filter are both connected to the feed port of the finished product bin. The gas outlet of the second-stage cooling pulse bag filter is connected to the tail gas treatment mechanism.

[0007] Furthermore, the primary cooling cyclone dust removal mechanism includes a primary stage one cooling cyclone dust collector and a primary stage two cooling cyclone dust collector. The discharge port of the high-temperature cyclone dust collector and the gas outlet of the primary stage two cooling cyclone dust collector are both connected to the feed port of the primary stage one cooling cyclone dust collector. The gas outlet of the primary stage one cooling cyclone dust collector is connected to the feed port of the primary cooling pulse bag filter. The discharge port of the primary stage one cooling cyclone dust collector is connected to the feed port of the primary stage two cooling cyclone dust collector. The discharge port of the primary stage two cooling cyclone dust collector is connected to the feed port of the secondary cooling cyclone dust removal mechanism.

[0008] Furthermore, the primary waste heat utilization system further includes a primary cooling blower, and the air outlet of the primary cooling blower is connected to the feed port of the primary stage two cooling cyclone dust collector.

[0009] Furthermore, the secondary cooling cyclone dust removal mechanism includes a secondary stage one cooling cyclone dust collector and a secondary stage two cooling cyclone dust collector. The discharge port of the primary stage two cooling cyclone dust collector and the gas outlet of the secondary stage two cooling cyclone dust collector are both connected to the feed port of the secondary stage one cooling cyclone dust collector. The gas outlet of the secondary stage one cooling cyclone dust collector is connected to the feed port of the secondary cooling pulse bag filter. The discharge port of the secondary stage one cooling cyclone dust collector is connected to the feed port of the secondary stage two cooling cyclone dust collector. The discharge ports of the secondary stage two cooling cyclone dust collector and the secondary cooling pulse bag filter are both connected to the feed port of the finished product bin.

[0010] Furthermore, the secondary waste heat utilization system further includes a secondary cooling blower, and the air outlet of the secondary cooling blower is connected to the feed port of the secondary stage two cooling cyclone dust collector.

[0011] Furthermore, the secondary waste heat utilization system further includes a secondary cooling induced draft fan, and the secondary cooling induced draft fan is arranged between the secondary cooling pulse bag filter and the tail gas treatment mechanism.

[0012] Furthermore, the tail gas treatment mechanism includes a desulfurization mechanism, a denitration mechanism and a chimney. The air inlet of the desulfurization mechanism is connected to the gas outlet of the secondary cooling pulse bag filter. The exhaust port of the desulfurization mechanism is connected to the air inlet of the denitration mechanism. The exhaust port of the denitration mechanism is connected to the air inlet of the chimney.

[0013] Furthermore, the tail gas treatment mechanism further includes a flue gas online monitoring system, and the flue gas online monitoring system is arranged in the chimney.

[0014] The present invention has the following advantages: By using a primary waste heat utilization system and a secondary waste heat utilization system for step-by-step waste heat utilization, the tail gas after being processed by the primary waste heat utilization system enters the combustion chamber for use as combustion-supporting gas, and the waste heat enters the calcination system for recycling, which can reduce nitrogen oxides, lower energy consumption and production costs. At the same time, the high-temperature tail gas is not discharged into the atmosphere, which is green, environmentally friendly and energy-saving in production; the temperature of the tail gas after being processed by the secondary waste heat utilization system is about 50 °C, and after being processed by the tail gas treatment mechanism, it is discharged, which is more energy-saving and environmentally friendly and can effectively avoid environmental pollution; the whole system adopts two-stage waste heat utilization, which can make full use of the waste heat of the system, making the calcination process green, environmentally friendly and energy-saving in production. Therefore, it has important significance in industrial production.

[0015] According to the second aspect of the present invention, a waste heat utilization process for calcination tail gas adopts the waste heat utilization system described in the first aspect, including a primary waste heat utilization process and a secondary waste heat utilization process;

[0016] The primary waste heat utilization process is as follows: After the high-temperature material is transported to the high-temperature cyclone dust collector for separation, it is successively transported to the primary stage first-stage cooling cyclone dust collector and the primary stage second-stage cooling cyclone dust collector for step-by-step cooling, heat exchange and separation. The gas separated in the primary stage second-stage cooling cyclone dust collector is transported to the primary stage first-stage cooling cyclone dust collector for heat exchange, and then transported to the primary stage cooling pulse bag dust collector for dust removal, and finally transported to the combustion chamber for use as combustion-supporting gas;

[0017] The secondary waste heat utilization process is as follows: The solids separated from the primary stage second-stage cooling cyclone dust collector and the solids separated from the primary stage cooling pulse bag dust collector are mixed and then successively transported to the secondary stage first-stage cooling cyclone dust collector and the secondary stage second-stage cooling cyclone dust collector for step-by-step cooling, heat exchange and separation. The gas separated in the secondary stage second-stage cooling cyclone dust collector is transported to the secondary stage first-stage cooling cyclone dust collector for heat exchange, and then transported to the secondary stage cooling pulse bag dust collector for dust removal, and then transported to the tail gas treatment mechanism for treatment. Finally, the solids separated from the secondary stage second-stage cooling cyclone dust collector and the solids separated from the secondary stage cooling pulse bag dust collector are transported to the finished product bin for caching.

[0018] Further, the temperature of the gas transported to the tail gas treatment mechanism in the secondary waste heat utilization process is less than 50 °C.

[0019] The present invention has the following advantages: By adopting a two-stage waste heat utilization process, the temperature of the tail gas output in the primary waste heat utilization process is relatively high, and it is directly transported to the combustion system for use as combustion-supporting air; the temperature of the tail gas output in the secondary waste heat utilization process is relatively low, and it is discharged after being processed by the tail gas treatment mechanism; the two-stage waste heat utilization processes are used in cooperation with each other, which can make full use of the waste heat of the system, making the calcination process green, environmentally friendly and energy-saving in production, and has important significance in industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0022] Figure 1 It is a schematic diagram of the overall structure of a waste heat utilization system for calcination tail gas provided by some embodiments of the present invention.

[0023] In the figure: 1. finished product bin, 2. secondary two-stage cooling cyclone dust collector, 3. secondary one-stage cooling cyclone dust collector, 4. secondary cooling pulse bag filter, 5. secondary cooling induced draft fan, 6. tail gas treatment mechanism, 7. primary two-stage cooling cyclone dust collector, 8. high-temperature cyclone dust collector, 9. primary one-stage cooling cyclone dust collector, 10. primary cooling blower, 11. primary cooling pulse bag filter, 12. combustion chamber. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following specific embodiments illustrate the embodiments of the present invention. Those familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0025] Embodiment 1

[0026] As Figure 1As shown, a calcination tail gas waste heat utilization system in an embodiment of the first aspect of the present invention comprises a first-stage waste heat utilization system and a second-stage waste heat utilization system, wherein the first-stage waste heat utilization system comprises a high-temperature cyclone dust collector 8, a first-stage cooling cyclone dust removal mechanism and a first-stage cooling pulse bag dust collector 11, the discharge port of the high-temperature cyclone dust collector 8 is connected to the feed port of the first-stage cooling cyclone dust removal mechanism, the gas outlet of the first-stage cooling cyclone dust removal mechanism is connected to the feed port of the first-stage cooling pulse bag dust collector 11, and the gas outlet of the first-stage cooling pulse bag dust collector 11 is connected to the blast port of the combustion chamber 12;

[0027] The two-stage waste heat utilization system includes a two-stage cooling cyclone dust removal mechanism and a two-stage cooling pulse bag dust collector 4. The discharge port of the first-stage cooling cyclone dust removal mechanism and the discharge port of the first-stage cooling pulse bag dust collector 11 are both connected to the feed port of the second-stage cooling cyclone dust removal mechanism, the gas outlet of the second-stage cooling cyclone dust removal mechanism is connected to the feed port of the second-stage cooling pulse bag dust collector 4, the discharge port of the second-stage cooling cyclone dust removal mechanism and the discharge port of the second-stage cooling pulse bag dust collector 4 are both connected to the feed port of the finished product silo 1, and the gas outlet of the second-stage cooling pulse bag dust collector 4 is connected to the exhaust gas treatment mechanism 6.

[0028] In the present embodiment, it should be noted that the exhaust gas treatment mechanism 6 includes a desulfurization mechanism, a denitrification mechanism, a chimney and a flue gas online monitoring system. The desulfurization mechanism, the denitrification mechanism and the flue gas online monitoring system all adopt existing structures, and their specific structures and operating principles are not repeated here. The air inlet of the desulfurization mechanism is connected to the gas outlet of the two-stage cooling pulse bag dust collector 4, the exhaust port of the desulfurization mechanism is connected to the air inlet of the denitrification mechanism, and the exhaust port of the denitrification mechanism is connected to the air inlet of the chimney. The flue gas online monitoring system is arranged in the chimney for real-time monitoring of various indicators of the exhaust gas to ensure that the exhaust gas is discharged in compliance with the standards.

[0029] The technical effect achieved by this embodiment is: using a first-stage waste heat utilization system and a second-stage waste heat utilization system to utilize waste heat step by step, the exhaust gas treated by the first-stage waste heat utilization system enters the combustion chamber 12 for use as a combustion-supporting gas, and the waste heat enters the calcination system for recycling, which can reduce nitrogen oxides, and reduce energy consumption and production costs. At the same time, the high-temperature exhaust gas is not discharged into the atmosphere, which is green, environmentally friendly and energy-saving; the exhaust gas temperature after being treated by the second-stage waste heat utilization system is about 50°C, and it is discharged after being treated by the exhaust gas treatment mechanism, which is more energy-saving and environmentally friendly, and can effectively avoid environmental pollution; the entire system adopts two-stage waste heat utilization, which can make full use of the system waste heat, and can make the calcination process green, environmentally friendly and energy-saving, so it has important significance in industrial production.

[0030] Example 2

[0031] like Figure 1As shown in the figure, another calcination tail gas waste heat utilization system provided in this embodiment includes all the contents of Embodiment 1, and only the different parts will be described below.

[0032] In this embodiment, the primary cooling cyclone dust removal mechanism includes a primary stage one cooling cyclone dust collector 9 and a primary stage two cooling cyclone dust collector 7. The discharge port of the high-temperature cyclone dust collector 8 and the gas outlet of the primary stage two cooling cyclone dust collector 7 are both connected to the feed port of the primary stage one cooling cyclone dust collector 9. The gas outlet of the primary stage one cooling cyclone dust collector 9 is connected to the feed port of the primary stage cooling pulse bag filter 11. The discharge port of the primary stage one cooling cyclone dust collector 9 is connected to the feed port of the primary stage two cooling cyclone dust collector 7. The discharge port of the primary stage two cooling cyclone dust collector 7 is connected to the feed port of the secondary cooling cyclone dust removal mechanism. Discharge valves are respectively provided at the discharge ports of the primary stage one cooling cyclone dust collector 9, the primary stage two cooling cyclone dust collector 7, and the primary stage one cooling cyclone dust collector 9.

[0033] In this embodiment, it should be noted that the primary waste heat utilization system further includes a primary cooling blower 10. The air outlet of the primary cooling blower 10 is connected to the feed port of the primary stage two cooling cyclone dust collector 7. The primary cooling blower 10 is used to blow in air for heat exchange with the material.

[0034] The technical effect achieved by this embodiment is that the primary cooling cyclone dust removal mechanism includes a primary stage one cooling cyclone dust collector 9 and a primary stage two cooling cyclone dust collector 7. Two-stage cooling heat exchange is adopted, and cooling heat exchange can be carried out step by step to ensure the full utilization of waste heat.

[0035] Embodiment 3

[0036] As Figure 1 As shown in the figure, another calcination tail gas waste heat utilization system provided in this embodiment includes all the contents of Embodiment 2, and only the different parts will be described below.

[0037] In this embodiment, the secondary cooling cyclone dust removal mechanism includes a secondary stage one cooling cyclone dust collector 3 and a secondary stage two cooling cyclone dust collector 2. The discharge port of the primary stage two cooling cyclone dust collector 7 and the gas outlet of the secondary stage two cooling cyclone dust collector 2 are both connected to the feed port of the secondary stage one cooling cyclone dust collector 3. The gas outlet of the secondary stage one cooling cyclone dust collector 3 is connected to the feed port of the secondary cooling pulse bag filter 4. The discharge port of the secondary stage one cooling cyclone dust collector 3 is connected to the feed port of the secondary stage two cooling cyclone dust collector 2. The discharge ports of the secondary stage two cooling cyclone dust collector 2 and the secondary cooling pulse bag filter 4 are both connected to the feed port of the finished product bin 1. Discharge valves are respectively provided at the discharge ports of the secondary stage one cooling cyclone dust collector 3, the secondary stage two cooling cyclone dust collector 2, and the secondary cooling pulse bag filter 4.

[0038] In this embodiment, it should be noted that the secondary waste heat utilization system further includes a secondary cooling blower and a secondary cooling induced draft fan 5. The air outlet of the secondary cooling blower is connected to the feed port of the secondary stage II cooling cyclone dust collector 2. The secondary cooling blower is used to blow in air for heat exchange between materials. The secondary cooling induced draft fan 5 is arranged between the secondary cooling pulse bag filter 4 and the tail gas treatment mechanism 6. The secondary cooling induced draft fan 5 is used to provide power to transport the tail gas to the tail gas treatment mechanism 6.

[0039] The technical effect achieved by this embodiment is that the stage cooling cyclone dust removal mechanism includes a secondary stage I cooling cyclone dust collector 3 and a secondary stage II cooling cyclone dust collector 2. By adopting two-stage cooling heat exchange, the cooling heat exchange can be carried out step by step to ensure the full utilization of waste heat.

[0040] Embodiment 4

[0041] As Figure 1 shown, a calcination tail gas waste heat utilization process in the second aspect embodiment of the present invention adopts the waste heat utilization system in the first aspect, and includes a primary waste heat utilization process and a secondary waste heat utilization process;

[0042] The primary waste heat utilization process is as follows: After the high-temperature material is transported to the high-temperature cyclone dust collector 8 for separation, it is sequentially transported to the primary stage I cooling cyclone dust collector 9 and the primary stage II cooling cyclone dust collector 7 for step-by-step cooling heat exchange separation. The gas separated from the primary stage II cooling cyclone dust collector 7 is transported to the primary stage I cooling cyclone dust collector 9 for heat exchange, and then transported to the primary cooling pulse bag filter 11 for dust removal, and finally transported to the combustion chamber 12 for use as combustion-supporting gas. The waste heat enters the calcination system for circular utilization;

[0043] The secondary waste heat utilization process is as follows: The solids separated from the primary stage II cooling cyclone dust collector 7 and the solids separated from the primary cooling pulse bag filter 11 are mixed and then sequentially transported to the secondary stage I cooling cyclone dust collector 3 and the secondary stage II cooling cyclone dust collector 2 for step-by-step cooling heat exchange separation. The gas separated from the secondary stage II cooling cyclone dust collector 2 is transported to the secondary stage I cooling cyclone dust collector 3 for heat exchange, and then transported to the secondary cooling pulse bag filter 4 for dust removal, and then transported to the tail gas treatment mechanism 6 for treatment. Finally, the solids separated from the secondary stage II cooling cyclone dust collector 2 and the solids separated from the secondary cooling pulse bag filter 4 are transported to the finished product bin 1 for caching.

[0044] In this embodiment, it should be noted that the temperature of the gas transported to the combustion chamber 12 in a section of the waste heat utilization process is about 150 °C, and the hot air is directly sent to the combustion system by the combustion-supporting fan as combustion-supporting air; in the waste heat utilization process of the second section, the temperature of the gas transported to the tail gas treatment mechanism 6 is less than 50 °C, and the calorific value of the tail gas is low, which is more energy-saving and environmentally friendly.

[0045] The technical effects achieved in this embodiment are as follows: The two-stage waste heat utilization process is adopted. The temperature of the tail gas output in the waste heat utilization process of the first section is relatively high, and it is directly transported to the combustion system as combustion-supporting air; the temperature of the tail gas output in the waste heat utilization process of the second section is relatively low, and it is discharged after being treated by the tail gas treatment mechanism. The two-stage waste heat utilization processes are used in cooperation to make full use of the system waste heat, making the calcination process green, environmentally friendly and energy-saving, which has important significance in industrial production.

[0046] Although the present invention has been described in detail above with general descriptions and specific embodiments, on the basis of the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope claimed by the present invention.

[0047] The terms such as "upper", "lower", "left", "right", "middle" and the like cited in this specification are only for the convenience of clear description and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present invention.

Claims

1. A calcination tail gas waste heat utilization system, characterized in that It includes a primary waste heat utilization system and a secondary waste heat utilization system. The primary waste heat utilization system includes a high-temperature cyclone dust collector (8), a primary cooling cyclone dust removal mechanism, and a primary cooling pulse bag filter (11). The discharge port of the high-temperature cyclone dust collector (8) is connected to the feed port of the primary cooling cyclone dust removal mechanism. The gas outlet of the primary cooling cyclone dust removal mechanism is connected to the feed port of the primary cooling pulse bag filter (11). The gas outlet of the primary cooling pulse bag filter (11) is connected to the air inlet of the combustion chamber (12). The secondary waste heat utilization system includes a secondary cooling cyclone dust removal mechanism and a secondary cooling pulse bag filter (4). The discharge ports of the primary cooling cyclone dust removal mechanism and the primary cooling pulse bag filter (11) are both connected to the feed port of the secondary cooling cyclone dust removal mechanism. The gas outlet of the secondary cooling cyclone dust removal mechanism is connected to the feed port of the secondary cooling pulse bag filter (4). The discharge ports of the secondary cooling cyclone dust removal mechanism and the secondary cooling pulse bag filter (4) are both connected to the feed port of the finished product bin (1). The gas outlet of the secondary cooling pulse bag filter (4) is connected to the tail gas treatment mechanism (6).

2. The waste heat utilization system for calcination tail gas according to claim 1, characterized in that, The primary cooling cyclone dust removal mechanism includes a primary first-stage cooling cyclone dust collector (9) and a primary second-stage cooling cyclone dust collector (7). The discharge port of the high-temperature cyclone dust collector (8) and the gas outlet of the primary second-stage cooling cyclone dust collector (7) are both connected to the feed port of the primary first-stage cooling cyclone dust collector (9). The gas outlet of the primary first-stage cooling cyclone dust collector (9) is connected to the feed port of the primary cooling pulse bag filter (11). The discharge port of the primary first-stage cooling cyclone dust collector (9) is connected to the feed port of the primary second-stage cooling cyclone dust collector (7). The discharge port of the primary second-stage cooling cyclone dust collector (7) is connected to the feed port of the secondary cooling cyclone dust removal mechanism.

3. The waste heat utilization system for calcination tail gas according to claim 2, wherein, The primary waste heat utilization system further includes a primary cooling blower (10). The air outlet of the primary cooling blower (10) is connected to the feed port of the primary second-stage cooling cyclone dust collector (7).

4. A calcination tail gas waste heat utilization system according to claim 2, characterized in that, The secondary cooling cyclone dust removal mechanism includes a secondary first-stage cooling cyclone dust collector (3) and a secondary second-stage cooling cyclone dust collector (2). The discharge port of the primary second-stage cooling cyclone dust collector (7) and the gas outlet of the secondary second-stage cooling cyclone dust collector (2) are both connected to the feed port of the secondary first-stage cooling cyclone dust collector (3). The gas outlet of the secondary first-stage cooling cyclone dust collector (3) is connected to the feed port of the secondary cooling pulse bag filter (4). The discharge port of the secondary first-stage cooling cyclone dust collector (3) is connected to the feed port of the secondary second-stage cooling cyclone dust collector (2). The discharge ports of the secondary second-stage cooling cyclone dust collector (2) and the secondary cooling pulse bag filter (4) are both connected to the feed port of the finished product bin (1).

5. A calcination tail gas waste heat utilization system according to claim 4, characterized in that, The two-stage waste heat utilization system further includes a two-stage cooling blower, and the air outlet of the two-stage cooling blower is connected to the feed inlet of the two-stage secondary cooling cyclone dust collector (2).

6. The waste heat utilization system for calcination tail gas according to claim 4, characterized in that, The two-stage waste heat utilization system further includes a two-stage cooling induced draft fan (5), and the two-stage cooling induced draft fan (5) is arranged between the two-stage cooling pulse bag filter (4) and the tail gas treatment mechanism (6).

7. The waste heat utilization system for calcination tail gas according to claim 1, wherein The tail gas treatment mechanism (6) includes a desulfurization mechanism, a denitration mechanism and a chimney. The air inlet of the desulfurization mechanism is connected to the gas outlet of the two-stage cooling pulse bag filter (4), the exhaust outlet of the desulfurization mechanism is connected to the air inlet of the denitration mechanism, and the exhaust outlet of the denitration mechanism is connected to the air inlet of the chimney.

8. A calcination tail gas waste heat utilization system according to claim 7, characterized in that, The tail gas treatment mechanism (6) further includes a flue gas on-line monitoring system, and the flue gas on-line monitoring system is arranged in the chimney.

9. A process for utilizing the waste heat of calcination tail gas, which adopts the waste heat utilization system described in any one of claims 1 to 8, is characterized in that, It includes a first-stage waste heat utilization process and a second-stage waste heat utilization process; The first-stage waste heat utilization process is as follows: After the high-temperature material is transported to the high-temperature cyclone dust collector (8) for separation, it is successively transported to the first-stage primary cooling cyclone dust collector (9) and the first-stage secondary cooling cyclone dust collector (7) for step-by-step cooling, heat exchange and separation. The gas separated from the first-stage secondary cooling cyclone dust collector (7) is transported to the first-stage primary cooling cyclone dust collector (9) for heat exchange, and then transported to the first-stage cooling pulse bag filter (11) for dust removal, and finally transported to the combustion chamber (12) for use as combustion-supporting gas. The second-stage waste heat utilization process is as follows: The solids separated from the first-stage secondary cooling cyclone dust collector (7) and the solids separated from the first-stage cooling pulse bag filter (11) are mixed and then successively transported to the second-stage primary cooling cyclone dust collector (3) and the second-stage secondary cooling cyclone dust collector (2) for step-by-step cooling, heat exchange and separation. The gas separated from the second-stage secondary cooling cyclone dust collector (2) is transported to the second-stage primary cooling cyclone dust collector (3) for heat exchange, and then transported to the second-stage cooling pulse bag filter (4) for dust removal, and then transported to the tail gas treatment mechanism (6) for treatment. Finally, the solids separated from the second-stage secondary cooling cyclone dust collector (2) and the solids separated from the second-stage cooling pulse bag filter (4) are transported to the finished product silo (1) for caching.

10. A calcination tail gas waste heat utilization process according to claim 9, characterized in that, In the second-stage waste heat utilization process, the temperature of the gas transported to the tail gas treatment mechanism (6) is less than 50°C.

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