Sintering rotary furnace waste heat composite recovery structure

Abstract

The present application relates to waste heat recovery equipment technical field, specifically to a kind of sintering rotary furnace waste heat composite recovery structure, including rotary furnace main body, boiler main body, economizer and flue gas treatment device, rotary furnace main body exhaust pipe is communicated with the hearth of boiler main body by connecting pipe, economizer two ends are connected with the flue of boiler main body and flue gas treatment device, flue gas treatment device includes compression chamber, piston, driving device, drain, exhaust port, vortex tube and recovery cavity, compression chamber is communicated with economizer by throat pipe, piston is located in compression chamber and forms moving pair with compression chamber, driving device can drive piston to move, drain, exhaust port are communicated with compression chamber, recovery cavity surrounds the outside of compression chamber and is communicated with vortex tube hot gas outlet, realizes four times waste heat recovery by the cooperation of each component, and waste heat recovery efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to rotary furnace waste heat recovery equipment field, especially to a sintering rotary furnace waste heat composite recovery structure. BACKGROUND

[0002] Sintering rotary furnace (Fritting furnace) refers to the existing technology by heating to realize powder sintering furnace-like equipment, the prior art to reduce air pollution, rotary furnace often uses natural gas, hydrogen or biogas and other clean energy as fuel, its combustion flue gas main component is unsaturated water vapor and high temperature air (CO2), friendly to the environment.

[0003] Rotary furnace high temperature flue gas waste heat commonly used recovery method is into the heat exchanger and discharge, through the heat exchanger recovery after flue gas still has higher temperature can reach 150 DEG C or more, waste heat utilization rate is less than 60%, heat recovery efficiency is not high, the purpose of the present application is to improve the waste heat recovery structure of the existing rotary furnace, to improve the waste heat utilization efficiency of rotary furnace flue gas. SUMMARY

[0004] The purpose of the present application is to provide a sintering rotary furnace waste heat composite recovery structure to solve the problems mentioned in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme: including rotary furnace main body, boiler main body, economizer and flue gas treatment device, the rotary furnace main body exhaust pipe is communicated with the boiler main body hearth through the connecting pipe, the high temperature flue gas generated by rotary furnace main body combustion is discharged to the boiler main body through the connecting pipe for the first time waste heat recovery, direct application in boiler main body production steam or hot water, here rotary furnace main body refers to the gas type rotary furnace with natural gas, hydrogen, biogas and other fuels as raw material, the economizer is connected with the boiler main body flue and flue gas treatment device respectively, the economizer refers to the equipment provided in the boiler main body flue for recovering waste heat of flue gas, which belongs to the prior art content and its structure and working principle are known to those skilled in the art, therefore, its specific structure and working principle will not be described further, it is used for the second time waste heat recovery of flue gas discharged from the boiler main body.

[0006] The flue gas treatment device comprises a compression cavity, a piston, a driving device, a water outlet, an exhaust outlet, a vortex tube and a recovery cavity, the compression cavity is communicated with the economizer through a throat pipe, the throat pipe has a diameter length a, the first cavity and the second cavity have a length b, the length of the compression cavity is greater than or equal to a+2b, the piston is located in the compression cavity and matched with the compression cavity to form a moving pair along the length direction of the compression cavity, the compression cavity is divided into the first cavity and the second cavity by the piston, the first cavity and the second cavity are respectively connected with the first electromagnetic valve and the second electromagnetic valve arranged on the two sides of the compression cavity, the water outlet and the exhaust outlet communicated with the first cavity and the second cavity are controlled through the first electromagnetic valve and the second electromagnetic valve, the driving device can drive the piston to move, the water outlet is located at the bottom end of the compression cavity and communicated with the compression cavity, the first electromagnetic valve is installed on the water outlet, the liquefied water generated in the steam compression process is discharged by opening the first electromagnetic valve, the exhaust outlet is located at the side of the compression cavity and communicated with the compression cavity, the second electromagnetic valve is installed on the exhaust outlet, and the flue gas treatment device is used for the third waste heat recovery of the flue gas recovered by the economizer.

[0007] The vortex tube gas inlet is communicated with the second electromagnetic valve, and the high-pressure flue gas recovered by the flue gas treatment device is subjected to the fourth waste heat recovery through the cooperation of the vortex tube and the recovery cavity.

[0008] The recovery cavity is filled with a heat-conducting medium, the recovery cavity surrounds the outside of the compression cavity, the recovery cavity is provided with a heat exchange pipe, and one end of the heat exchange pipe is communicated with the hot gas outlet of the vortex tube; and the heat-conducting medium can be selected by the skilled person according to actual requirements, for example, heat-conducting oil, water and the like.

[0009] In order to optimize the above technical scheme, the following measures are further taken: the driving device is an oil cylinder, the oil cylinder is fixedly connected with the boiler body through a fixing frame, the oil cylinders are symmetrically distributed on the two sides of the recovery cavity, the movable ends of the oil cylinders pass through the recovery cavity and are connected with the piston, the piston is driven to reciprocate in the compression cavity through the cooperation of the oil cylinders, and specifically, a high-temperature-resistant oil cylinder can be used to prolong the operation stability and service life of the driving device.

[0010] As a further improvement of the technical scheme, a third electromagnetic valve is installed on the throat pipe, and the purpose of the third electromagnetic valve is to control the flow of the throat pipe.

[0011] As an improvement of the foregoing technical scheme, a sheet-shaped air-permeable steel is arranged in the throat pipe close to one end of the compression cavity, the sheet-shaped air-permeable steel refers to a sheet-shaped part made of air-permeable steel, the surface of the air-permeable steel has a plurality of micropores, and the purpose of the sheet-shaped air-permeable steel is to collect the liquid drops in the steam in the flue gas through the air holes of the air-permeable steel, so that the liquid drops are captured to form larger liquid drops, which is helpful for subsequent compression to liquefy the steam and release heat.

[0012] Further, the vortex tube low-temperature gas outlet is provided with a waste pipe, the end of the waste pipe points to the side away from the recovery cavity, the waste pipe is arranged to guide the low-temperature gas discharged by the vortex tube, so that the low-temperature gas is away from the economizer and the flue gas treatment device, and the low-temperature gas is prevented from directly blowing to cause the waste heat recovery efficiency to decrease.

[0013] From the above description of the structure of the present application, compared with the prior art, the present application has the following advantages:

[0014] A. The boiler main body operates to realize first waste heat recovery by taking high-temperature flue gas as a heat source, the economizer performs second waste heat recovery on the flue gas, the flue gas treatment device releases condensation latent heat to complete third waste heat recovery by compressing unsaturated flue gas, and then the vortex tube cooperates with the recovery cavity to realize fourth waste heat recovery, so that the waste heat recovery efficiency is high;

[0015] B. The flue gas can continuously pass through the throat pipe in the waste heat recovery process through the rotation of the first chamber and the second chamber, so that the low-temperature flue gas is prevented from remaining in the furnace to affect the operation of the boiler, and the process is helped to ensure that the boiler does not need to be stopped;

[0016] C. When the piston is away from the chamber communicated with the throat pipe, the first electromagnetic valve and the second electromagnetic valve communicated with the chamber are closed, and in the process of the piston being away from the chamber, negative pressure is formed to suck the flue gas, so that the moving speed of the flue gas can be improved and the problem of blockage can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the present application illustrated in the drawings and their descriptions are used to explain the present application and are not intended to limit the present application. In the drawings:

[0018] Figure 1 It is a perspective view of the three-dimensional structure of the present application (view angle one);

[0019] Figure 2 It is a perspective view of the three-dimensional structure of the present application (view angle two);

[0020] Figure 3 It is a perspective view of the three-dimensional structure of the boiler main body (view angle one);

[0021] Figure 4 It is a perspective view of the three-dimensional structure of the boiler main body (view angle two);

[0022] Figure 5 It is a perspective view of the three-dimensional structure of the flue gas treatment device (view angle one);

[0023] Figure 6 It is a perspective view of the three-dimensional structure of the flue gas treatment device (view angle two);

[0024] Figure 7Partial truncated structure schematic view (view angle one) of the flue gas treatment device;

[0025] Figure 8 Partial truncated structure schematic view (view angle two) of the flue gas treatment device;

[0026] In the figure: rotary furnace main body-1, connecting pipe-101, boiler main body-2, economizer-3, flue gas treatment device-4, compression cavity-401, piston-402, driving device-403, drainage port-404, exhaust port-405, vortex pipe-406, recovery cavity-407, throat pipe-408, first electromagnetic valve-409, second electromagnetic valve-4010, heat exchange pipe-4011, fixed frame-4012, first cavity-4013, second cavity-4014, third electromagnetic valve-4015, waste discharge pipe-4016 DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Embodiment 1

[0028] Please refer to Figures 1-8 The present application provides a sintering rotary furnace waste heat composite recovery structure, which comprises a rotary furnace main body 1, a boiler main body 2, an economizer 3 and a flue gas treatment device 4.

[0029] The rotary furnace main body 1 exhaust pipe is communicated with the boiler main body 2 hearth through the connecting pipe 101.

[0030] The economizer 3 is connected with the boiler main body 2 flue and the flue gas treatment device 4 respectively.

[0031] The flue gas treatment device 4 comprises a compression cavity 401, a piston 402, a driving device 403, a drainage port 404, an exhaust port 405, a vortex pipe 406 and a recovery cavity 407.

[0032] The compression cavity 401 is communicated with the economizer 3 through the throat pipe 408, the third electromagnetic valve 4015 is installed on the throat pipe 408, the piston 402 is located in the compression cavity 401 and matched with the compression cavity 401 to form a moving pair along the length direction of the compression cavity 401, the driving device 403 can drive the piston 402 to move, and the driving device 403 is specifically an oil cylinder, the oil cylinder is fixedly connected with the boiler main body 2 through the fixed frame 4012, the oil cylinders are symmetrically distributed on both sides of the recovery cavity 407, and the movable ends of the oil cylinders pass through the recovery cavity 407 and are connected with the piston 402.

[0033] The drain port 404 is located at the bottom end of the compression cavity 401 and communicates with the compression cavity 401, and the first electromagnetic valve 409 is installed on the drain port 404.

[0034] The exhaust port 405 is located at the side of the compression cavity 401 and communicates with the compression cavity 401, and the second electromagnetic valve 4010 is installed on the exhaust port 405. The compression cavity 401 is divided into a first chamber 4013 and a second chamber 4014 by the piston 402. The throat pipe 408 has a diameter length a, the first chamber 4013 and the second chamber 4014 have a length b, and the length of the compression cavity 401 is greater than or equal to a+2b. The first electromagnetic valve 409 and the second electromagnetic valve 4010 are respectively arranged on the two sides of the compression cavity 401 and connected with the first chamber 4013 and the second chamber 4014.

[0035] The inlet of the vortex tube 406 communicates with the second electromagnetic valve 4010, and the low-temperature gas outlet of the vortex tube 406 is provided with a waste pipe 4016, and the end of the waste pipe 4016 is directed away from the recovery cavity 407.

[0036] The recovery cavity 407 is filled with a heat-conducting medium, and the recovery cavity 407 surrounds the outside of the compression cavity 401. The heat exchange pipe 4011 is arranged in the recovery cavity 407, and one end of the heat exchange pipe 4011 communicates with the hot gas outlet of the vortex tube 406. Embodiment 2

[0037] Please refer to Figures 1-8 The application provides a sintering rotary furnace waste heat composite recovery structure, which comprises a rotary furnace body 1, a boiler body 2, an energy saver 3 and a flue gas treatment device 4.

[0038] The flue gas discharge pipeline of the rotary furnace body 1 communicates with the hearth of the boiler body 2 through a connecting pipe 101.

[0039] The energy saver 3 is connected with the flue of the boiler body 2 and the flue gas treatment device 4 at two ends respectively.

[0040] The flue gas treatment device 4 comprises a compression cavity 401, a piston 402, a driving device 403, a drain port 404, an exhaust port 405, a vortex tube 406 and a recovery cavity 407.

[0041] The compression cavity 401 communicates with the energy saver 3 through a throat pipe 408, the throat pipe 408 is internally provided with a sheet-shaped air-permeable steel near one end close to the compression cavity 401, the throat pipe 408 is provided with a third electromagnetic valve 4015, the piston 402 is located in the compression cavity 401 and matches the compression cavity 401 to form a moving pair along the length direction of the compression cavity 401, the driving device 403 can drive the piston 402 to move, and the driving device 403 is specifically an oil cylinder, the oil cylinder is fixedly connected with the boiler body 2 through a fixing frame 4012, the oil cylinder is symmetrically distributed on the two sides of the recovery cavity 407, and the movable end of the oil cylinder penetrates through the recovery cavity 407 and is connected with the piston 402.

[0042] The drain port 404 is located at the bottom end of the compression cavity 401 and communicates with the compression cavity 401, and the first electromagnetic valve 409 is installed on the drain port 404;

[0043] The exhaust port 405 is located at the side of the compression cavity 401 and communicates with the compression cavity 401, and the second electromagnetic valve 4010 is installed on the exhaust port 405. The compression cavity 401 is divided into a first chamber 4013 and a second chamber 4014 by the piston 402. The throat pipe 408 has a diameter length a, the first chamber 4013 and the second chamber 4014 have a length b, and the length of the compression cavity 401 is greater than or equal to a+2b. The first electromagnetic valve 409 and the second electromagnetic valve 4010 are respectively arranged on the two sides of the compression cavity 401 and connected with the first chamber 4013 and the second chamber 4014 respectively;

[0044] The inlet of the vortex tube 406 communicates with the second electromagnetic valve 4010, and the low-temperature gas outlet of the vortex tube 406 is provided with a waste pipe 4016, and the end of the waste pipe 4016 points away from the recovery cavity 407;

[0045] The recovery cavity 407 is filled with a heat-conducting medium, and the recovery cavity 407 surrounds the outside of the compression cavity 401. The heat exchange pipe 4011 is arranged in the recovery cavity 407, and one end of the heat exchange pipe 4011 communicates with the hot gas outlet of the vortex tube 406.

[0046] Working principle: The high-temperature flue gas generated by the rotary furnace main body 1 is introduced into the furnace of the boiler main body 2 as a heat source for direct application for the first waste heat recovery. The flue gas carries unsaturated steam. Then, the flue gas carrying steam leaves the flue and enters the economizer 3 for the second waste heat recovery. Then, the flue gas and steam enter the compression cavity 401 for the third waste heat recovery. After the third waste heat recovery, a small amount of high-pressure flue gas with steam is discharged from the hot gas outlet of the vortex tube 406 into the recovery cavity 407 for the fourth waste heat recovery. After the fourth waste heat recovery, the air can be preheated in the boiler or directly discharged.

[0047] When the flue gas carrying unsaturated steam generated by the combustion in the boiler main body 2 enters the compression cavity 401 through the throat pipe 408 for the third waste heat recovery, the flue gas is first pressed by the piston 402. In the process, the first electromagnetic valve 409 and the second electromagnetic valve 4010 are closed to ensure sealing and ensure that the unsaturated steam is compressed into supersaturated steam. The volume of the steam pressed by the piston 402 is reduced, so that the steam is compressed and phase changes into a liquid state. In the phase change process, heat is released in the form of latent heat of condensation, which can be transferred to the recovery cavity 407 for collection through heat transfer.

[0048] When the third waste heat recovery is completed, the flue gas with a small amount of steam left is compressed to have a large pressure, at this time, the second electromagnetic valve 4010 is opened to guide the flue gas with pressure into the vortex tube 406, the flue gas is divided into hot air and cold air in the vortex tube 406 and leaves from the hot gas outlet of the vortex tube 406 and the exhaust pipe 4016 respectively, the hot air is guided into the recovery cavity 407 through the heat exchange pipe 4011 to exchange heat with the heat conduction medium, so that the fourth waste heat recovery is completed.

[0049] The first cavity 4013 and the second cavity 4014 reciprocate to perform the above-mentioned operation to realize the waste heat recovery of the flue gas, since the piston 402 can move in the compression cavity 401, when the first cavity 4013 performs flue gas compression, the flue gas generated by the boiler combustion can continuously enter the second cavity 4014 to prepare for the next compression, when the second cavity 4014 performs flue gas compression, the flue gas generated by the boiler combustion can continuously enter the first cavity 4013 to prepare for the next compression, which does not affect the combustion of the boiler and the steam discharge.

[0050] When the piston 402 moves away from the cavity communicating with the throat pipe 408, the first electromagnetic valve 409 and the second electromagnetic valve 4010 communicating with the cavity are closed, and in the process of moving away from the cavity, the piston 402 will form a negative pressure to suck the flue gas, which can improve the moving speed of the flue gas and will not cause the problem of blockage.

[0051] The control mode of the present application is realized by an external controller to realize automatic control, the control circuit of the controller can be realized by simple programming of those skilled in the art, the power supply also belongs to the common knowledge in the art, and the present application is mainly used to protect mechanical devices, so the control mode and circuit connection of the present application will not be explained in detail.

[0052] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0053] In addition, the terms "first", "second", "third" are only for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second", "third" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0054] Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be replaced by equivalent features, by those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sintering rotary furnace waste heat composite recovery structure, characterized in that: it comprises a rotary furnace main body (1), a boiler main body (2), an economizer (3) and a flue gas treatment device (4); the rotary furnace main body (1) is communicated with the hearth of the boiler main body (2) through a connecting pipe (101); the economizer (3) is connected with the flue of the boiler main body (2) and the flue gas treatment device (4) respectively; the flue gas treatment device (4) comprises a compression cavity (401), a piston (402), a driving device (403), a drainage port (404), an exhaust port (405), a vortex tube (406) and a recovery cavity (407); the compression cavity (401) is communicated with the economizer (3) through a throat pipe (408), the throat pipe (408) has a diameter length a, a first cavity (4013) and a second cavity (4014) have a length b, the length of the compression cavity (401) is greater than or equal to a+2b, the piston (402) is located in the compression cavity (401) and matched with the compression cavity (401) to form a moving pair along the length direction of the compression cavity (401), the driving device (403) can drive the piston (402) to move, the compression cavity (401) is divided into the first cavity (4013) and the second cavity (4014) by the piston (402), and the first cavity (4013) and the second cavity (4014) are respectively connected with a first electromagnetic valve (409) and a second electromagnetic valve (4010) arranged on the two sides of the compression cavity (401); the drainage port (404) is located at the bottom end of the compression cavity (401) and communicated with the compression cavity (401), and the first electromagnetic valve (409) is arranged on the drainage port (404); the exhaust port (405) is located on the side of the compression cavity (401) and communicated with the compression cavity (401), and the second electromagnetic valve (4010) is arranged on the exhaust port (405); the vortex tube (406) is communicated with the second electromagnetic valve (4010); the recovery cavity (407) is filled with a heat-conducting medium, surrounds the outside of the compression cavity (401), and is provided with a heat exchange pipe (4011) and the heat exchange pipe (4011) is communicated with the hot gas outlet of the vortex tube (406) at one end. The driving device (403) is an oil cylinder, the oil cylinder is fixedly connected with the boiler main body (2) through a fixing frame (4012), the oil cylinder is symmetrically distributed on the two sides of the recovery cavity (407), and the movable end of the oil cylinder is connected with the piston (402) through the recovery cavity (407). The throat pipe (408) is provided with a third electromagnetic valve (4015). The throat pipe (408) is provided with a sheet-shaped air-permeable steel inside the end close to the compression cavity (401). The vortex tube (406) is provided with a waste pipe (4016) at the low-temperature gas outlet, and the waste pipe (4016) is directed away from the recovery cavity (407) at the end. ​ ​ ​ ​ ​ 2. The sintering rotary furnace waste heat combined recovery structure according to claim 1, characterized in that: ​ 3. The combined waste heat recovery structure of a sintering rotary furnace according to any one of claims 1 or 2, characterized in that: ​ 4. The combined waste heat recovery structure of a sintering rotary furnace according to any one of claims 1 or 2, characterized in that: ​ 5. The combined waste heat recovery structure of a sintering rotary furnace according to any one of claims 1 or 2, characterized in that: ​

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