A flue gas waste heat recycling system

Abstract

The present invention provides a flue gas waste heat recycling system, including a firing kiln, a green body drying kiln, a desulfurization tower and a spray tower drying furnace. The high-temperature flue gas discharged from the firing kiln conducts the flue gas waste heat through a first heat exchanger and is used for the combustion air of the fuel combustion in the spray tower drying furnace, thereby increasing the initial temperature and internal energy of the combustion air, making the fuel in the spray tower drying furnace easier to burn, and reducing the combustion air volume and fuel required to generate the same heat and flue gas temperature; at the same time, the flue gas waste heat is conducted through the first heat exchanger and can also be used for the air of the green body drying furnace to dry ceramic green bodies, so as to reduce the fuel consumed when drying ceramic green bodies; in addition, the flue gas in the middle part of the firing process of the firing kiln is introduced into the second heat exchanger as a supplement to the heat that is insufficient to complete the drying of the green bodies when the heat extracted by the first heat exchanger is insufficient. The second heat exchanger can be used as a backup for the first heat exchanger, which can save energy, reduce carbon emissions, and improve corporate benefits.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to a flue gas waste heat recycling system. Background Art

[0002] Ceramics is a general term for pottery and porcelain, and is also a kind of arts and crafts in my country. As early as the Neolithic Age, my country already had rough and simple painted pottery and black pottery. Pottery and porcelain have different textures and properties.

[0003] The ceramic production industry consumes a lot of energy and is one of the 14 key industries that my country is currently focusing on promoting transformation and upgrading and carrying out comprehensive energy conservation and emission reduction supervision. In the current ceramic production process, due to the need for ceramic firing, the exhaust temperature of the firing kiln is very high. The high-temperature flue gas is directly discharged into the atmosphere through the chimney after being sprayed and cooled during the desulfurization process in the desulfurization tower. A large amount of heat in the flue gas cannot be effectively utilized, resulting in huge energy waste. Summary of the invention

[0004] In view of this, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a flue gas waste heat recycling system.

[0005] The present invention provides the following technical solution: a flue gas waste heat recycling system, comprising a firing kiln, a green body drying kiln, a desulfurization tower, a spray tower drying furnace and a first heat exchanger;

[0006] The firing kiln is connected to the desulfurization tower through a first air flow channel;

[0007] A first fan assembly is provided at the inlet side of the first air flow channel, the air inlet of the first fan assembly is connected to the smoke exhaust port of the firing kiln through a pipeline, and the air outlet of the first fan assembly is connected to the desulfurization tower through the first air flow channel via the first heat exchanger;

[0008] The flue gas inlet side of the first heat exchanger is connected to the air outlet of the first fan assembly, and the flue gas outlet side of the first heat exchanger is connected to the desulfurization tower;

[0009] The air inlet of the first heat exchanger is connected to the air outlet of the second fan assembly through a pipeline, and the air outlet of the first heat exchanger is connected to the third air flow channel;

[0010] The third airflow channel is connected to the main pipe through the fourth airflow channel, the main pipe is connected to the green body drying kiln, and the third airflow channel is connected to the combustion air inlet of the spray tower drying furnace through the fifth airflow channel.

[0011] In some embodiments of the present invention, the first fan assembly includes a first fan and at least one first standby fan, a first isolation baffle is provided on a pipe connecting an air outlet of the first fan and the first air flow channel, and a second isolation baffle is provided on a pipe connecting an air outlet of the first standby fan and the first air flow channel;

[0012] The second fan assembly includes a second fan and at least one second backup fan, a third isolation baffle is provided on the pipe connecting the air outlet of the second fan and the air inlet side of the first heat exchanger, and a fourth isolation baffle is provided on the pipe connecting the air outlet of the second backup fan and the air inlet side of the first heat exchanger.

[0013] Furthermore, a first temperature sensor is provided on the pipe connecting the air inlet side of the first heat exchanger and the second fan assembly, a second temperature sensor is provided on the third air flow channel, and the second temperature sensor is located on the air outlet side of the first heat exchanger.

[0014] Furthermore, the first airflow channel is provided with a seventh isolation baffle and an eighth isolation baffle spaced apart from each other, the seventh isolation baffle is arranged on the smoke inlet side of the first heat exchanger, and the eighth isolation baffle is arranged on the smoke outlet side of the first heat exchanger;

[0015] The first air flow channel is provided with a third temperature sensor and a fourth temperature sensor spaced apart from each other;

[0016] The third temperature sensor is disposed between the seventh isolation baffle and the smoke inlet of the first heat exchanger, and the fourth temperature sensor is disposed between the eighth isolation baffle and the smoke outlet side of the first heat exchanger.

[0017] Furthermore, the fourth air flow channel is provided with a first flow sensor, a first pressure sensor, a first air volume adjustment baffle and a tenth isolation baffle in sequence;

[0018] The tenth isolation baffle is arranged between the third air flow channel and the mother pipe.

[0019] The first air volume adjustment baffle is disposed between the tenth isolation baffle and the third air flow channel.

[0020] The first flow sensor and the first pressure sensor are respectively arranged between the first air volume adjustment baffle and the third air flow channel;

[0021] Furthermore, the fifth air flow channel is provided with a second flow sensor, a second pressure sensor and an eleventh isolation baffle;

[0022] The second flow sensor and the second pressure sensor are arranged between the eleventh isolation baffle and the third air flow channel;

[0023] A first branch pipe and a second branch pipe are provided between the fifth air flow channel and the spray tower drying furnace;

[0024] The air outlet of the fifth air flow channel is respectively connected to the air inlet of the first branch pipe and the air inlet of the second branch pipe;

[0025] The air outlet of the first branch pipe and the air outlet of the second branch pipe are respectively connected to the combustion air inlets on both sides of the spray tower drying furnace;

[0026] A second air volume regulating baffle is provided on the first branch pipe, a fourth fan is provided on one side of the first branch pipe, an air outlet of the fourth fan is connected to the first branch pipe through a pipeline, and the air outlet of the fourth fan is located between the second air volume regulating baffle and the combustion air inlet of the spray tower drying furnace;

[0027] A third air volume regulating baffle is provided on the second branch pipe, and a fifth fan is also provided on one side of the second branch pipe. The air outlet of the fifth fan is connected with the second branch pipe through a pipeline, and the air outlet of the fifth fan is located between the third air volume regulating baffle and the combustion air inlet of the spray tower drying furnace.

[0028] Further, a sixth air flow channel is provided on one side of the first heat exchanger, and both ends of the sixth air flow channel are connected to the first air flow channel;

[0029] The flue gas inlet of the sixth air flow channel is located between the first isolation baffle and the seventh isolation baffle, and the flue gas outlet of the sixth air flow channel is located between the eighth isolation baffle and the desulfurization tower;

[0030] A ninth isolation baffle is disposed on the sixth air flow channel.

[0031] Furthermore, the main pipe is connected to the green body drying kiln through a plurality of connecting branch pipes, and a flow distributor is installed on each of the connecting branch pipes.

[0032] Furthermore, the drain hole of the first heat exchanger is connected to the top water inlet hole of the drain tank through a pipeline;

[0033] The bottom drainage hole of the drain tank is connected to the desulfurization tower through a U-shaped water seal;

[0034] One side of the drain tank is provided with a liquid level transmitter and a liquid level switch which are spaced apart from each other.

[0035] Furthermore, a drain pipe is provided at the bottom of the drain tank, and a drain control valve is provided on the drain pipe.

[0036] The embodiments of the present invention have the following advantages: the high-temperature exhaust gas of the firing furnace is used to heat the air through the first heat exchanger, and a part of the heated high-temperature hot air is used as the combustion-supporting air for the spray tower drying furnace through the fifth air flow channel to increase the initial temperature of the heating air, which is beneficial to the complete combustion of the fuel, thereby reducing the amount of combustion-supporting air required for combustion, and the smoke temperature after combustion is higher, which is more conducive to the drying of the spray drying tower particles; another part of the high-temperature hot air is sent to the green body drying furnace through the fourth air flow channel for drying the ceramic green bodies. Through the above two methods, the heat of the high-temperature exhaust gas of the firing furnace is exported and reused in ceramic production, thereby effectively reducing the fuel required for production, achieving the purpose of saving energy, reducing carbon emissions, and improving corporate benefits.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A structural schematic diagram of a flue gas waste heat recycling system from one perspective is shown in some embodiments of the present invention;

[0040] Figure 2 Shows Figure 1 Enlarged view of part A in the middle;

[0041] Figure 3 Shows Figure 1 Enlarged view of middle part B;

[0042] Figure 4 Shows Figure 1 Enlarged view of the middle C part;

[0043] Figure 5 Shows Figure 1 Enlarged view of the middle D part;

[0044] Figure 6 An enlarged view of a drain tank in a flue gas waste heat recycling system provided by some embodiments of the present invention is shown;

[0045] Figure 7 Shows Figure 1Enlarged view of part E in the middle.

[0046] Description of main component symbols:

[0047] 10-firing kiln; 20-green body drying kiln; 30-desulfurization tower; 40-spray tower drying furnace; 50-second air flow channel; 60-first fan assembly; 70-first air flow channel; 80-first heat exchanger; 90-second fan assembly; 100-third air flow channel; 110-fourth air flow channel; 120-mother pipe; 130-fifth air flow channel; 140-second heat exchanger; 60a-first fan; 60b-first standby fan; 150-third First isolation baffle; 160-second isolation baffle; 90a-second fan; 90b-second standby fan; 170-third isolation baffle; 180-fourth isolation baffle; 190-third fan assembly; 190a-third fan; 190b-third standby fan; 200-fifth isolation baffle; 210-sixth isolation baffle; 220-first temperature sensor; 230-second temperature sensor; 240-third temperature sensor; 250-fourth temperature sensor ; 260-seventh isolation baffle; 270-eighth isolation baffle; 280-sixth air flow channel; 290-ninth isolation baffle; 300-first flow sensor; 310-first pressure sensor; 320-tenth isolation baffle; 330-first air volume adjustment baffle; 340-second flow sensor; 350-second pressure sensor; 360-eleventh isolation baffle; 370-first branch pipe; 380-second branch pipe; 390-second air volume adjustment Baffle; 400-fourth fan; 410-third air volume adjustment baffle; 420-fifth fan; 430-connecting branch pipe; 440-flow distributor; 450-U-type water seal; 460-liquid level transmitter; 470-liquid level switch; 480-drain pipe; 490-control valve; 500-drain tank; 510-fourth fan assembly; 510a-sixth fan; 510b-sixth standby fan; 520-twelfth isolation baffle; 530-thirteenth isolation baffle. DETAILED DESCRIPTION

[0048] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0049] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0053] like Figures 1 to 3 As shown, some embodiments of the present invention provide a flue gas waste heat recycling system, which is mainly used in the ceramic industry to recover and reuse the heat in the high-temperature flue gas emitted by fuel combustion, so as to save the fuel consumed by the green body drying kiln to dry the green body or the spray tower drying furnace to dry the slurry, thereby reducing fuel consumption, reducing carbon emissions, increasing corporate benefits, and comprehensively improving energy efficiency and environmental protection levels. The flue gas waste heat recycling system includes a firing kiln 10, a green body drying kiln 20, a desulfurization tower 30 and a spray tower drying furnace 40.

[0054] It should be noted that the firing kiln 10 refers to a furnace used for firing ceramic objects and sculptures or fusing enamel to the surface of metal objects. The green body drying kiln 20 is used to dry the wet green ceramics produced in the ceramic production process in the ceramic industry. The desulfurization tower 30 is a tower device for desulfurizing flue gas. The spray tower drying furnace 40 is a device that can simultaneously complete drying and granulation. According to the process requirements, the pressure, flow rate, and size of the spray hole of the feed liquid pump can be adjusted to obtain the required spherical particles of a certain size ratio.

[0055] The exhaust port of the firing kiln 10 is connected to the desulfurization tower 30 through the first airflow channel 70. It can be understood that the gas generated by the combustion of fuel in the firing kiln 10 flows into the desulfurization tower 30 through the first airflow channel 70, and the flue gas generated by the combustion of fuel is desulfurized by the desulfurization tower 30 to reduce the emission of sulfur dioxide and reduce the pollution of flue gas to the atmosphere.

[0056] The inlet side of the first airflow channel 70 (the inlet side of the first airflow channel 70 here refers to the flue gas inlet side of the first airflow channel 70) is provided with a first fan assembly 60, and the air outlet of the first fan assembly 60 is connected to the first airflow channel 70 through a pipeline, and the outlet side of the first airflow channel 70 (the outlet side of the first airflow channel 70 here refers to the flue gas outlet side of the first airflow channel 70) is connected to the desulfurization tower 30. The high-temperature flue gas discharged from the firing kiln 10 can be sent to the desulfurization tower 30 for desulfurization treatment through the first fan assembly 60. Specifically, the speed of the fan in the first fan assembly 60 can be controlled to adjust the flue gas flow in the first airflow channel 70, thereby adjusting the pressure in the firing kiln.

[0057] It should be noted here that the high-temperature flue gas discharged from the firing kiln 10 refers to the high-temperature flue gas discharged after the ceramic is fired in the firing kiln 10. Since the high-temperature exhaust gas is heat-exchanged by the first heat exchanger to exchange the heat carried by it to the air, it is used to increase the temperature of the combustion air for fuel combustion in the spray tower drying furnace and directly introduced into the green body drying furnace to dry the ceramic green body. After the flue gas is heat-exchanged, the temperature is reduced and the volume is reduced (reduced to half of the current level), which also reduces the subsequent flue gas treatment cost.

[0058] In addition, the flue gas in the middle of the firing kiln 10 can also be connected to the desulfurization tower 30 through the second airflow channel 50. It can be understood that the flue gas passing through the second airflow channel 50 is the high-temperature flue gas extracted from the middle of the firing kiln 10, rather than the flue gas discharged from the tail. The high-temperature section of this part of the flue gas has been consumed when firing ceramics in the firing kiln, and the low-temperature section has limited effect in the firing kiln. After being extracted, the heat in the flue gas is extracted and used for green body drying, which may have a higher energy utilization rate.

[0059] It should be noted that the second airflow channel serves as a supplement and backup to the first airflow channel. When the heat extracted by the first heat exchanger is not enough for drying the green billets, the second heat exchanger and the third fan assembly are started to extract the heat of the extracted flue gas to supplement the insufficient heat of the first heat exchanger. When the heat exchanger, isolation baffle, and air volume adjustment baffle on the first and fourth airflow channels fail, the second airflow channel is started to complete the drying of the green billets.

[0060] The extracted flue gas flows into the desulfurization tower 30 through the second air flow channel 50, and the flue gas is desulfurized by the desulfurization tower 30 to reduce the emission of sulfur dioxide and reduce the gas pollution to the atmosphere generated after the combustion of fuel.

[0061] It should be noted that in order to improve the recovery and reuse of heat in the exhaust gas of the firing kiln 10, a first heat exchanger 80 is installed on the first airflow channel 70, and the air inlet side of the first heat exchanger 80 is connected to the air outlet of the second fan assembly 90 through a pipeline, and the air outlet side of the first heat exchanger 80 is connected to the third airflow channel 100, and the heat of the flue gas flowing through the first airflow channel 70 is introduced into the gas flowing through the first heat exchanger through the first heat exchanger, thereby realizing the heat extraction of the flue gas.

[0062] Specifically, when the second fan assembly 90 is working, the fan blades rotate to squeeze the air on the force-bearing surface in an oblique manner to move in a direction perpendicular to the fan blade surface, so that the cold air flows into the interior of the first heat exchanger 80 through the air inlet side of the first heat exchanger 80, and the heat in the flue gas flowing through the first air flow channel 70 is extracted by the cold air flowing through the first heat exchanger 80, thereby heating the cold air flowing through the first heat exchanger 80, and the hot air is discharged from the air outlet side of the first heat exchanger 80 and flows into the third air flow channel 100.

[0063] It should be noted that the air flow through the first heat exchanger 80 can be adjusted by adjusting the workload of the second fan assembly 90 according to production needs, thereby adjusting the hot air temperature on the air outlet side of the first heat exchanger 80.

[0064] At the same time, the third airflow channel 100 is connected to the main pipe 120 through the fourth airflow channel 110. It can be understood that the hot air flowing through the third airflow channel 100 flows into the hot air main pipe 120 of the green body drying furnace through the fourth airflow channel 110, and the main pipe 120 is connected to the green body drying kiln 20, and flows into the green body drying kiln 20 through the main pipe 120. After the hot air is introduced into the green body drying kiln 20, the heat in the green body drying kiln 20 is increased, the flow rate of the air in the green body drying kiln 20 is increased, and the drying efficiency of the green body is improved.

[0065] In some embodiments of the present invention, the mother pipe 120 refers to a hot air mother pipe of a green body drying furnace.

[0066] Among them, the third air flow channel 100 is also connected to the combustion air inlet of the spray tower drying furnace 40 through the fifth air flow channel 130, so that the hot air in the third air flow channel 100 enters the combustion chamber of the spray tower drying furnace 40 from the air inlet of the spray tower drying furnace 40 through the fifth air flow channel 130, and serves as combustion air when the fuel is burned in the spray tower drying furnace 40.

[0067] Since the initial temperature of the combustion air for fuel combustion in the spray tower dryer 40 is increased, it is more conducive to the combustion of the fuel and reduces the heat loss of the cold air heating part in the spray tower dryer 40. At the same time, after the initial temperature of the combustion air is increased, the fuel is easier to burn. The flue gas temperature after the fuel is burned in the spray tower dryer 40 will be higher. The fuel and combustion air consumed to achieve the same drying effect will be reduced accordingly, and the smoke exhaust volume and the heat carried away by the smoke exhaust will also be reduced accordingly, thereby achieving the purpose of saving fuel and reducing emissions.

[0068] Since the flue gas temperature increases after the fuel is burned, it is more conducive to the vaporization of the water in the slurry in the spray tower drying furnace 40, thereby improving the vaporization efficiency of the water in the slurry in the spray tower drying furnace 40, thereby improving the production efficiency.

[0069] Optionally, in some embodiments of the present invention, a second heat exchanger 140 is further provided on the second air flow channel 50, and the heat of the smoke in the second air flow channel 50 is extracted through the second heat exchanger 140. At the same time, the air inlet of the second heat exchanger 140 is connected to the air outlet of the third fan assembly 190 through a pipeline, and the air outlet of the second heat exchanger 140 is connected to the mother pipe 120 through a hot air pipe, and is connected to the green body drying kiln 20.

[0070] It should be noted that, in some embodiments of the present invention, the flue gas passing through the second air flow channel is high-temperature flue gas extracted from the middle of the firing kiln.

[0071] Specifically, when the third fan assembly 190 is working, the cold air flows into the interior of the second heat exchanger 140 through the air inlet of the second heat exchanger 140, and the heat in the flue gas flowing through the second air flow channel 50 is introduced into the cold air flowing through the second heat exchanger 140 through the second heat exchanger 140, thereby heating the cold air flowing through the second heat exchanger 140 to form hot air, which is discharged from the air outlet of the second heat exchanger 140 and flows into the main pipe 120.

[0072] Since the main pipe 120 is connected to the green body drying kiln 20, the hot air flowing into the main pipe 120 flows evenly into the green body drying kiln 20 through the flow distributor, thereby improving the uniformity of air flow in the green body drying kiln 20 and the uniformity of the green body drying process in the green body drying kiln 20, which not only improves the drying efficiency of the green body, but also improves the quality of the green body.

[0073] Since the air flowing into the green body drying kiln 20 through the main pipe 120 is hot air, not only the circulation rate of the air in the green body drying kiln is improved, but also the green bodies in the green body drying kiln 20 are under the same drying temperature conditions, which reduces the fuel required for drying the green bodies in the green body drying kiln 20, thereby saving fuel, reducing combustion emissions, lowering production costs, improving enterprise benefits, and achieving the goals of energy saving, emission reduction, and efficiency improvement.

[0074] Specifically, in some embodiments of the present invention, the first heat exchanger 80 and the second heat exchanger 140 are both gas heat exchangers.

[0075] By recovering the waste heat of the flue gas after the fuel is burned in the firing process in the firing kiln 10, and introducing the heat in the flue gas into the cold air flowing through the first heat exchanger and / or the second heat exchanger through the first heat exchanger and / or the second heat exchanger, and then introducing the hot air of the first heat exchanger and / or the second heat exchanger into the spray tower drying furnace 40 and / or the green body drying kiln 20, the slurry and the green body are dried, and the heat in the exhaust gas is recovered and reused. At the same time, the initial temperature of the combustion air of the spray tower drying furnace 40 is increased by the hot air, the fuel combustion is accelerated, and the combustion air volume is reduced, thereby reducing the exhaust volume and the heat carried away by the exhaust, and the smoke temperature after the fuel is burned in the spray tower drying furnace 40 is increased. The drying effect of the particles in the spray tower drying furnace 40 is further improved, and the heat utilization rate after the fuel is burned is improved, which not only saves fuel in many aspects, but also reduces the flue gas emission, saves production costs, and improves economic efficiency.

[0076] like Figure 1 and Figure 7 As shown, the inlet side of the second airflow channel 50 (the inlet side of the second airflow channel 50 here refers to the flue gas inlet side of the second airflow channel 50) is also installed with a fourth fan assembly 510, and the fourth fan assembly 510 includes a sixth fan 510a and at least one sixth standby fan 510b. The high-temperature flue gas in the middle of the firing kiln 10 can be sent to the desulfurization tower 30 for desulfurization treatment through the fourth fan assembly 510. Specifically, the speed of the fan in the fourth fan assembly 510 can be controlled to adjust the flue gas flow in the second airflow channel 50, thereby adjusting the pressure in the firing kiln.

[0077] It is understandable that the number of the sixth standby fans 510b can be one or any number of more than two, and can be set according to actual conditions.

[0078] In some embodiments of the present invention, there is one sixth standby fan 510b. By setting the sixth standby fan 510b, the phenomenon that the system cannot continue to work normally when the sixth fan 510a fails is avoided. It should be noted that when the sixth fan 510a is in operation, the sixth standby fan 510b is in a standby or maintenance state. As a standby fan for the sixth fan 510a, when the sixth fan 510a fails, the sixth standby fan 510b can be switched to operate, thereby improving the stability and safety of the sixth fan assembly 510 during operation.

[0079] A twelfth isolation baffle 520 is provided on the pipe connecting the air outlet of the sixth fan 510a and the second air flow channel 50, and the sixth fan 510a can be connected or disconnected with the second air flow channel 50 through the twelfth isolation baffle 520.

[0080] At the same time, a thirteenth isolation baffle 530 is provided on the pipeline connecting the air outlet of the sixth standby fan 510b with the second air flow channel 50, and the sixth standby fan 510b can be connected or disconnected with the second air flow channel 50 through the thirteenth isolation baffle 530.

[0081] Specifically, when the sixth fan 510a is working, the sixth standby fan 510b is in standby or maintenance status. At this time, the twelfth isolation baffle 520 is opened and the thirteenth isolation baffle 530 is closed, so that the flue gas in the second air flow channel 50 can flow into the desulfurization tower 30 through the sixth fan 510a and the second heat exchanger 140.

[0082] In addition, when the sixth fan 510a cannot operate, the thirteenth isolation baffle 530 is opened and the twelfth isolation baffle 520 is closed, so that the sixth standby fan 510b is in operation and the sixth fan 510a is in maintenance. At this time, the exhaust gas of the firing kiln 10 flows into the desulfurization tower 30 through the second air flow channel 50, the sixth standby fan 510b and the second heat exchanger 140.

[0083] like Figures 1 to 3 As shown, in some embodiments of the present invention, the first fan assembly 60 includes a first fan 60a and at least one first standby fan 60b. It can be understood that the first fan assembly 60 includes a first fan 60a and one first standby fan 60b. Or the first fan assembly 60 includes a first fan 60a and a plurality of first standby fans 60b, wherein the number of first standby fans 60b can be two or more of any value, which can be specifically set according to actual conditions.

[0084] Specifically, in some embodiments of the present invention, the first fan assembly 60 includes a first fan 60a and a first standby fan 60b. By setting the first standby fan 60b, the phenomenon that the system cannot continue to work normally when the first fan 60a fails is avoided. It should be noted that when the first fan 60a is in operation, the first standby fan 60b is in a standby or maintenance state. As a standby fan of the first fan 60a, when the first fan 60a fails, it can be switched to the first standby fan 60b for operation, thereby improving the stability and safety of the first fan assembly 60 during operation.

[0085] Among them, a first isolation baffle 150 is provided on the pipe connecting the air outlet of the first fan 60a and the first air flow channel 70, and the first fan 60a can be connected or disconnected with the first air flow channel 70 through the first isolation baffle 150. At the same time, a second isolation baffle 160 is provided on the pipe connecting the air outlet of the first standby fan 60b and the first air flow channel 70, and the first standby fan 60b can be connected or disconnected with the first air flow channel 70 through the second isolation baffle 160. Specifically, when the first fan 60a is working, the first standby fan 60b is in a standby or maintenance state. At this time, the first isolation baffle 150 is opened and the second isolation baffle 160 is closed, so that the flue gas in the second air flow channel 50 can flow into the desulfurization tower 30 through the first fan 60a and the first air flow channel 70. In addition, when the first fan 60a cannot operate, the second isolation baffle 160 is opened and the first isolation baffle 150 is closed, so that the first standby fan 60b is in operation and the first fan 60a is in maintenance, so that the exhaust smoke of the firing kiln flows into the desulfurization tower 30 through the first standby fan 60b and the first air flow channel 70.

[0086] In addition, the second fan assembly 90 includes a second fan 90a and at least one second standby fan 90b. It is understandable that the second fan assembly 90 includes a second fan 90a and one second standby fan 90b. Or the second fan assembly 90 includes a second fan 90a and a plurality of second standby fans 90b, wherein the number of second standby fans 90b can be two or more, and can be set according to actual conditions.

[0087] Specifically, in some embodiments of the present invention, the second fan assembly 90 includes a second fan 90a and a second backup fan 90b.

[0088] A third isolation baffle 170 is provided on the pipeline connecting the air outlet of the second fan 90a and the first heat exchanger 80, and the second fan 90a can be connected or disconnected with the air inlet of the first heat exchanger 80 through the third isolation baffle 170. At the same time, a fourth isolation baffle 180 is provided on the pipeline connecting the air outlet of the second standby fan 90b and the first heat exchanger 80, and the second fan 90a can be connected or disconnected with the air inlet of the first heat exchanger 80 through the fourth isolation baffle 180.

[0089] Specifically, when the second fan 90a is working, the second standby fan 90b is in a standby or maintenance state. At this time, the third isolation baffle 170 is opened and the fourth isolation baffle 180 is closed, so that the cold air passes through the second fan 90a through the pipeline and enters the first heat exchanger 80 through the air inlet of the first heat exchanger 80. The cold air entering the first heat exchanger 80 is heated by the first heat exchanger 80 to form hot air, and flows into the third air channel from the air outlet of the first heat exchanger 80. The air volume entering the first heat exchanger 80 can be adjusted by adjusting the operating load of the second fan 90a, thereby adjusting the air temperature at the air outlet of the first heat exchanger 80.

[0090] In addition, when the second fan 90a cannot operate, the second standby fan 90b is switched to operate, and the second fan 90a is in a standby or maintenance state. When switching, the fourth isolation baffle 180 is opened and the third isolation baffle 170 is closed, so that the cold air passes through the second standby fan 90b through the pipeline and enters the first heat exchanger 80 through the air inlet of the first heat exchanger 80. At the same time, the air volume entering the first heat exchanger 80 can be adjusted by adjusting the operating load of the second standby fan 90b, thereby adjusting the air temperature at the outlet of the first heat exchanger 80.

[0091] In addition, the third fan assembly 190 includes a third fan 190a and at least one third standby fan 190b. It can be understood that the third fan assembly 190 includes the third fan 190a and one third standby fan 190b. Or the third fan assembly 190 includes the third fan 190a and multiple third standby fans 190b, wherein the number of third standby fans 190b can be two or more of any value, which can be specifically set according to actual conditions.

[0092] like Figure 1 , Figure 2 and Figure 5 As shown, in some embodiments of the present invention, the third fan assembly 190 includes a third fan 190a and a third backup fan 190b.

[0093] A fifth isolation baffle 200 is provided on the pipeline connecting the air outlet of the third fan 190a and the second heat exchanger 140, and the second fan 90a can be connected or disconnected with the air inlet of the second heat exchanger 140 through the fifth isolation baffle 200. At the same time, a sixth isolation baffle 210 is provided on the pipeline connecting the air outlet of the third standby fan 190b and the second heat exchanger 140, and the second fan 90a can be connected or disconnected with the air inlet of the second heat exchanger 140 through the sixth isolation baffle 210.

[0094] Specifically, when the third fan 190a is working, the third standby fan 190b is in a standby or maintenance state. At this time, the fifth isolation baffle 200 is opened and the sixth isolation baffle 210 is closed, so that the cold air passes through the third fan 190a through the pipeline and enters the second heat exchanger 140 through the air inlet of the second heat exchanger 140. The cold air entering the second heat exchanger 140 is heated by the second heat exchanger 140 to form hot air, and flows into the main pipe 120 from the air outlet of the second heat exchanger 140. The hot air discharged from the air outlet of the second heat exchanger 140 flows into the green body drying kiln 20 through the main pipe 120.

[0095] In addition, when the third fan 190a cannot operate, the third backup fan 190b is switched to operate, and the third fan 190a is in maintenance status. At this time, the fifth isolation baffle 200 is closed and the sixth isolation baffle 210 is opened, so that cold air passes through the third backup fan 190b through the pipeline and enters the second heat exchanger 140 through the air inlet of the second heat exchanger 140.

[0096] The air volume flowing into the second heat exchanger 140 can be adjusted by adjusting the load of the second fan assembly 90, thereby adjusting the air temperature at the air outlet of the first heat exchanger 80.

[0097] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, a first temperature sensor 220 is provided between the air inlet side of the first heat exchanger 80 and the second fan assembly 90. It should be noted that the first temperature sensor 220 is provided on a pipe connecting the second fan assembly 90 and the first heat exchanger 80, and the temperature of the air entering the first heat exchanger 80 is monitored by the first temperature sensor 220 and defined as T1.

[0098] At the same time, a second temperature sensor 230 is provided on the third air flow channel 100, and the second temperature sensor 230 is located on the air outlet side of the first heat exchanger 80. It can be understood that the hot air outlet side temperature of the first heat exchanger 80 is monitored by the second temperature sensor 230 and is defined as T2.

[0099] In some embodiments of the present invention, a seventh isolation baffle and an eighth isolation baffle are installed on the inner wall of the first airflow channel, the seventh isolation baffle 260 is arranged on the smoke inlet side of the first heat exchanger, and the eighth isolation baffle 270 is arranged on the smoke outlet side of the first heat exchanger.

[0100] At the same time, a third temperature sensor and a fourth temperature sensor are installed on the first air flow channel respectively. The third temperature sensor is arranged between the seventh isolation baffle 260 and the smoke inlet of the first heat exchanger, and the fourth temperature sensor is arranged between the eighth isolation baffle 270 and the smoke outlet side of the first heat exchanger 80. The third temperature sensor 240 is used to monitor the smoke temperature entering the first heat exchanger 80 and is defined as T3.

[0101] In addition, the temperature at the flue gas outlet side of the first heat exchanger 80 is monitored by the fourth temperature sensor 250 and is defined as T4.

[0102] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, a sixth airflow channel 280 is provided on one side of the first airflow channel 70, and both ends of the sixth airflow channel 280 are respectively connected to the first airflow channel 70. Specifically, the air inlet of the sixth airflow channel 280 is located between the first isolation baffle 150 and the seventh isolation baffle 260, and the air outlet of the sixth airflow channel 280 is located between the eighth isolation baffle 270 and the desulfurization tower 30.

[0103] It should be noted that when the seventh isolation baffle 260 or the eighth isolation baffle 270 is closed and the ninth isolation baffle 290 is opened, the flue gas flowing through the first airflow channel 70 directly flows into the desulfurization tower 30 through the sixth airflow channel. Under this operating condition, the first heat exchanger 80 can be repaired or replaced without affecting normal production.

[0104] When the seventh isolation baffle 260 and the eighth isolation baffle 270 are opened at the same time and the ninth isolation baffle 290 is closed, the flue gas discharged through the first fan assembly 60 flows into the desulfurization tower 30 through the first air flow channel 70 and the first heat exchanger 80. At this time, the heat in the flue gas flowing through the first air flow channel 70 can be introduced into the cold air flowing through the first heat exchanger 80 through the first heat exchanger 80.

[0105] like Figures 1 to 4 As shown, in some embodiments of the present invention, in order to monitor the flow and pressure of the gas in the fourth air flow channel 110 in real time, a first flow sensor 300, a first pressure sensor 310, a tenth isolation baffle 320 and a first air volume adjustment baffle 330 are provided inside the fourth air flow channel 110.

[0106] The tenth isolation baffle 320 is disposed between the third air flow channel and the mother pipe 120 .

[0107] The first air volume adjustment baffle 330 is disposed between the tenth isolation baffle and the third air flow channel.

[0108] The first flow sensor 300 and the first pressure sensor 310 are respectively arranged between the tenth isolation baffle and the third air flow channel. The first flow sensor 300 is used to monitor the gas flow in the fourth air flow channel, and the first pressure sensor 310 is used to monitor the gas pressure in the pipe in front of the first air volume regulating baffle.

[0109] It should be noted that the third air flow channel can be connected to the main pipe through the tenth isolation baffle 320, and the third air flow channel can also be isolated from the main pipe through the tenth isolation baffle 320.

[0110] Specifically, when the tenth isolation baffle 320 is closed, no gas in the fourth airflow channel 110 flows to the mother pipe 120. When the tenth isolation baffle 320 is opened, the flow rate of gas from the fourth airflow channel 110 to the mother pipe 120 is adjusted by controlling the opening of the first air volume adjustment baffle 330.

[0111] like Figure 1 and Figure 4 As shown, in some embodiments of the present invention, a second flow sensor 340, a second pressure sensor 350 and an eleventh isolation baffle 360 ​​are provided inside the fifth air flow channel 130. The second flow sensor and the second pressure sensor are respectively located between the eleventh isolation baffle and the air outlet of the third air flow channel.

[0112] It can be understood that the flow rate and pressure of the hot air flowing through the fifth air flow channel 130 are monitored by the second flow sensor 340 and the second pressure sensor 350 .

[0113] It should be noted that when the eleventh isolation baffle 360 ​​is closed, no gas in the fifth air flow channel 130 flows toward the spray tower drying furnace 40 .

[0114] When the eleventh isolation baffle 360 ​​is opened, the gas in the third air flow channel 100 can flow into the spray tower drying furnace 40 through the fifth air flow channel 130 .

[0115] In addition, in some embodiments of the present invention, a first branch pipe 370 and a second branch pipe 380 are provided between the fifth airflow channel 130 and the spray tower drying furnace 40, and a second air volume regulating baffle 390 is provided inside the first branch pipe 370, and a third air volume regulating baffle 410 is provided inside the second branch pipe 380.

[0116] Among them, the air outlet of the fifth airflow channel 130 is respectively connected to the air inlet of the first branch pipe 370 and the air inlet of the second branch pipe 380, and the air outlet of the first branch pipe 370 and the air outlet of the second branch pipe 380 are respectively connected to the combustion air inlet of the spray tower drying furnace 40, and the flow rate of the gas flowing through the first branch pipe 370 and into the spray tower drying furnace 40 is adjusted by the second adjusting baffle 390, or the flow rate of the gas flowing through the second branch pipe 380 and into the spray tower drying furnace 40 is adjusted by the third air volume adjusting baffle 410.

[0117] The gas flow from the fifth air flow channel 130 to the spray tower drying furnace 40 can be adjusted by controlling the opening of the second air volume regulating baffle 390 or the third air volume regulating baffle 410 .

[0118] In addition, a fourth fan 400 is provided on one side of the first branch pipe 370, and the air outlet of the fourth fan 400 is connected to the first branch pipe 370 through a pipeline, and the air outlet of the fourth fan 400 is located between the second air volume regulating baffle 390 and the air inlet of the spray tower drying furnace 40.

[0119] At the same time, a fifth fan 420 is also provided on one side of the second branch pipe 380, and the air outlet of the fifth fan 420 is connected to the second branch pipe 380 through a pipeline, and the air outlet of the fifth fan 420 is located between the third air volume adjustment baffle 410 and the air inlet of the spray tower drying furnace 40.

[0120] It should be noted that the fourth fan 400 and the fifth fan 420 are used to supplement the combustion-supporting air volume in the first branch branch and the second branch branch, respectively. When the combustion-supporting air volume in the first branch branch 370 and the second branch branch 380 is insufficient to support the required fuel combustion air volume, the fourth fan 400 and the fifth fan 420 are started, and the insufficient combustion-supporting air volume is supplemented by adjusting the load of the fourth fan 400 and the fifth fan 420.

[0121] In some embodiments of the present invention, the first temperature sensor 220, the second temperature sensor 230, the first flow sensor 300, the first pressure sensor 310, the second flow sensor 340 and the second pressure sensor 350 can be electrically connected to the monitoring instrument respectively, and the air inlet temperature of the first heat exchanger 80, the air outlet temperature of the first heat exchanger 80, the volume of hot air entering the spray tower drying furnace 40, the volume of hot air entering the green body drying kiln 20, the hot air pressure entering the spray tower drying furnace 40, and the hot air pressure entering the green body drying kiln 20 can be monitored through the monitoring instrument.

[0122] In addition, the third temperature sensor 240 and the fourth temperature sensor 250 may be electrically connected to a monitoring instrument, and the temperature of the first airflow channel 70 at the flue gas inlet and outlet sides of the first heat exchanger 80 may be monitored in real time by the monitoring instrument.

[0123] like Figure 1 As shown, in some embodiments of the present invention, the main pipe 120 is connected to the green body drying kiln 20 through a plurality of connecting branch pipes 430. It should be noted that the number of the connecting branch pipes 430 can be two or more of any numerical value, which can be specifically set according to actual conditions.

[0124] At the same time, a flow distributor 440 is installed on each connecting branch pipe 430, and the hot air flowing through the main pipe 120 can be evenly distributed to various places of the green body drying kiln 20 through the flow distributor 440, so that the air flow in the green body drying kiln 20 is uniform, so as to improve the uniformity of the green bodies in the green body drying kiln 20 during the drying process, thereby improving the quality of the green bodies.

[0125] like Figure 1 , Figure 2 and Figure 6 As shown, in some embodiments of the present invention, the drain hole of the first heat exchanger is connected to the drain tank through a pipeline, and the drain tank 500 is connected to the desulfurization tower 30 through a U-shaped water seal 450.

[0126] It should be noted that the drain tank 500 is used to collect water vapor in the flue gas condensed due to the low temperature in the first heat exchanger 80 when the first heat exchanger 80 is initially put into operation and when it is disconnected.

[0127] When the collected water level in the drain tank 500 is higher than the top of the U-shaped water seal 450, the condensed water in the drain tank 500 is discharged to the desulfurization tower 30 through the U-shaped tube. When the water level is lower than the top of the U-shaped water seal 450, the U-shaped tube water seal 450 and the condensed water in the drain tank 500 play a role in isolating the flue gas, preventing the flue gas from bypassing the first heat exchanger and directly entering the desulfurization tower 30.

[0128] In addition, a liquid level transmitter 460 and a liquid level switch 470 are provided on one side of the drain tank 500 .

[0129] In some embodiments of the present invention, a drain pipe 480 is further provided at the bottom of the drain tank 500, and the water inlet of the drain pipe 480 is connected to the drain hole at the bottom of the drain tank 500. At the same time, a control valve 490 is installed on the drain pipe 480, and the opening and closing of the control valve 490 is controlled by the liquid level switch 470. When the condensate in the drain tank 500 cannot be normally discharged into the desulfurization tower 30 through the U-shaped water seal pipe, and the liquid level in the drain tank reaches the action value of the liquid level switch 470, the liquid level switch 470 is closed and the control valve 490 is opened; when the liquid level of the drain tank 500 is lower than the reset value of the liquid level switch 470, the liquid level switch 470 is disconnected and the control valve 490 is closed.

[0130] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0131] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0132] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A flue gas waste heat recycling system, characterized in that: It includes a firing kiln, a green body drying kiln, a desulfurization tower, a spray tower drying furnace and a first heat exchanger; The firing kiln is connected to the desulfurization tower through a first air flow channel; A first fan assembly is provided at the inlet side of the first air flow channel, the air inlet of the first fan assembly is connected to the smoke exhaust port of the firing kiln through a pipeline, and the air outlet of the first fan assembly is connected to the desulfurization tower through the first air flow channel via the first heat exchanger; The flue gas inlet side of the first heat exchanger is connected to the air outlet of the first fan assembly, and the flue gas outlet side of the first heat exchanger is connected to the desulfurization tower; The air inlet of the first heat exchanger is connected to the air outlet of the second fan assembly through a pipeline, and the air outlet of the first heat exchanger is connected to the third air flow channel; The third air flow channel is connected to the main pipe through the fourth air flow channel, the main pipe is connected to the green body drying kiln, and the third air flow channel is connected to the combustion air inlet of the spray tower drying furnace through the fifth air flow channel; The first fan assembly includes a first fan and at least one first standby fan, a first isolation baffle is provided on a pipe connecting an air outlet of the first fan and the first air flow channel, and a second isolation baffle is provided on a pipe connecting an air outlet of the first standby fan and the first air flow channel; The second fan assembly includes a second fan and at least one second backup fan, a third isolation baffle is provided on the pipe connecting the air outlet of the second fan and the air inlet side of the first heat exchanger, and a fourth isolation baffle is provided on the pipe connecting the air outlet of the second backup fan and the air inlet side of the first heat exchanger.

2. The flue gas waste heat recycling system according to claim 1, characterized in that: A first temperature sensor is provided on the pipe connecting the air inlet side of the first heat exchanger and the second fan assembly, a second temperature sensor is provided on the third air flow channel, and the second temperature sensor is located on the air outlet side of the first heat exchanger.

3. The flue gas waste heat recycling system according to claim 1, characterized in that: The first air flow channel is provided with a seventh isolation baffle and an eighth isolation baffle spaced apart from each other, the seventh isolation baffle is arranged on the smoke inlet side of the first heat exchanger, and the eighth isolation baffle is arranged on the smoke outlet side of the first heat exchanger; The first air flow channel is provided with a third temperature sensor and a fourth temperature sensor spaced apart from each other; The third temperature sensor is disposed between the seventh isolation baffle and the smoke inlet of the first heat exchanger, and the fourth temperature sensor is disposed between the eighth isolation baffle and the smoke outlet side of the first heat exchanger.

4. The flue gas waste heat recycling system according to claim 2, characterized in that: The fourth air flow channel is provided with a first flow sensor, a first pressure sensor, a first air volume adjustment baffle and a tenth isolation baffle in sequence; The tenth isolation baffle is arranged between the third air flow channel and the mother pipe; The first air volume adjustment baffle is disposed between the tenth isolation baffle and the third air flow channel; The first flow sensor and the first pressure sensor are respectively arranged between the first air volume adjustment baffle and the third air flow channel.

5. The flue gas waste heat recycling system according to claim 2, characterized in that: The fifth air flow channel is provided with a second flow sensor, a second pressure sensor and an eleventh isolation baffle; The second flow sensor and the second pressure sensor are arranged between the eleventh isolation baffle and the third air flow channel; A first branch pipe and a second branch pipe are provided between the fifth air flow channel and the spray tower drying furnace; The air outlet of the fifth air flow channel is respectively connected to the air inlet of the first branch pipe and the air inlet of the second branch pipe; The air outlet of the first branch pipe and the air outlet of the second branch pipe are respectively connected to the combustion air inlet of the spray tower drying furnace; A second air volume regulating baffle is provided on the first branch pipe, a fourth fan is provided on one side of the first branch pipe, an air outlet of the fourth fan is connected to the first branch pipe through a pipeline, and the air outlet of the fourth fan is located between the second air volume regulating baffle and the combustion air inlet of the spray tower drying furnace; A third air volume regulating baffle is provided on the second branch pipe, and a fifth fan is also provided on one side of the second branch pipe. The air outlet of the fifth fan is connected with the second branch pipe through a pipeline, and the air outlet of the fifth fan is located between the third air volume regulating baffle and the combustion air inlet of the spray tower drying furnace.

6. The flue gas waste heat recycling system according to claim 3, characterized in that: A sixth air flow channel is provided on one side of the first heat exchanger, and both ends of the sixth air flow channel are connected to the first air flow channel; The flue gas inlet of the sixth air flow channel is located between the first isolation baffle and the seventh isolation baffle, and the flue gas outlet of the sixth air flow channel is located between the eighth isolation baffle and the desulfurization tower; A ninth isolation baffle is disposed on the sixth air flow channel.

7. The flue gas waste heat recycling system according to claim 1, characterized in that: The main pipe is connected to the green body drying kiln through a plurality of connecting branch pipes, and a flow distributor is installed on each of the connecting branch pipes.

8. The flue gas waste heat recycling system according to claim 1, characterized in that: The drain hole of the first heat exchanger is connected to the top water inlet hole of the drain tank through a pipeline; The bottom drainage hole of the drain tank is connected to the desulfurization tower through a U-shaped water seal; One side of the drain tank is provided with a liquid level transmitter and a liquid level switch which are spaced apart from each other.

9. The flue gas waste heat recycling system according to claim 8, characterized in that: A drain pipe is provided at the bottom of the drain tank, and a drain control valve is provided on the drain pipe.

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