Waste heat utilization equipment for calcining furnace

Abstract

The invention relates to calcining furnace waste heat utilization equipment. The calcining furnace waste heat utilization equipment comprises a furnace body provided with a cooling water jacket and a smoke exhaust pipe, a compressor, a heat regenerator, a heat source, a steam turbine, a generator and a cooler, the heat source comprises a first heat source, a second heat source and a working medium conveying pipe connected between the two heat sources in series. And a water outlet pipe of the cooling water jacket is connected with a water medium flow channel arranged in the first heat source. And the smoke exhaust pipe is connected with a smoke flow channel arranged in the second heat source. The compressor and the steam turbine are connected with the heat regenerator. And the cooler is arranged between the compressor and the heat regenerator. The inlet end of the working medium conveying pipe is arranged on the first heat source and connected with the heat regenerator. The outlet end of the working medium conveying pipe is arranged on the second heat source and connected with the steam turbine. A working medium conveying pipe arranged in the first heat source can exchange heat with water in the water medium flow channel. And a working medium conveying pipe arranged in the second heat source can exchange heat with flue gas in the flue gas flow channel. According to the invention, the purpose of recycling heat energy contained in the flue gas and the cooling water jacket can be achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of furnaces, in particular to a carbon calcination furnace, especially to a calcination furnace waste heat utilization equipment capable of saving energy. BACKGROUND

[0002] Tank-type calcination furnace is one of the main equipment used in the production process of carbon, which can smelt petroleum coke with different volatile content, and is widely used in carbon plants due to its advantages of stable calcination material quality, low carbon loss rate, high bulk density of calcined coke, simple operation, small maintenance workload, long continuous production cycle, etc.

[0003] When calcination furnace is used to calcine and smelt raw materials, the petroleum coke will burn due to volatilization, and the generated heat can be used for calcination of petroleum coke, and a large amount of excess heat is discharged with flue gas, resulting in a flue gas temperature of more than 900 degrees Celsius. Due to the characteristics of high flue gas temperature and small flue gas volume of the calcination furnace, the attitude of carbon plants towards the waste heat recovery of high-temperature flue gas of the calcination furnace is not very positive, and even many carbon plants use blast cooling to treat flue gas, that is, low-temperature air is mixed into high-temperature flue gas by a high-power blower, and then the flue gas is discharged into the atmosphere after forced cooling, resulting in waste of flue gas waste heat resources, and the increased power consumption of the high-power blower also increases the cost of carbon production.

[0004] In addition to the flue gas waste heat, the tank-type calcination furnace is provided with a cooling water jacket at the discharge end for cooling high-temperature calcined coke (which can reach more than 1000 degrees Celsius). In the prior art, the cooling water circulating in the cooling water jacket continuously exchanges heat with the calcined coke of the calcination furnace, and the heat-absorbed cooling water is sent to a cooling tower for heat dissipation, and then returns to the water jacket as the (cooling) inlet water of the cooling water jacket, and the cycle continues. It can be seen that the (cooling) outlet water of the cooling water jacket also contains a lot of heat, but the biggest disadvantage of this part of heat is that its temperature is too low, about 50 degrees Celsius, which belongs to low-temperature waste heat and is very difficult to utilize, so the current carbon plants generally do not consider recycling and utilizing this part of heat source. SUMMARY

[0005] The calcination furnace waste heat utilization equipment provided by the present application can realize the recycling and utilization of the heat energy contained in the flue gas and the cooling water jacket.

[0006] The technical solution adopted by this invention to solve its technical problem is: a waste heat utilization device for a calcining furnace, including a furnace body. A cooling water jacket is provided at the discharge end at the lower part of the furnace body. An exhaust pipe extends from the furnace body to send the flue gas generated by combustion out of the furnace. It also includes a compressor, a regenerator, a heat source, a matching steam turbine and generator, and a cooler. The heat source includes a first heat source, a second heat source, and a working fluid conveying pipe connected in series between the two heat sources. That is, the working fluid conveying pipe arranged in the first heat source and the working fluid conveying pipe arranged in the second heat source form a series connection relationship, so that the working fluid exchanges heat with the cooling water in the first heat source and then flows into the second heat source to exchange heat with the flue gas.

[0007] The outlet pipe of the cooling water jacket is connected to a water medium flow channel located inside the first heat source. The drain end of the water medium flow channel is equipped with a fitting that allows connection to the outside. The flue gas pipe is connected to a flue gas flow channel located inside the second heat source. The exhaust end of the flue gas flow channel is equipped with a fitting that allows connection to the outside.

[0008] The first outlet of the compressor and the fourth outlet of the turbine are connected to the regenerator, allowing the working fluid output from the compressor to exchange heat with the exhaust gas from the turbine in the regenerator. The cooler is located between the first inlet of the compressor and the second outlet of the regenerator.

[0009] The inlet end of the working fluid conveying pipe is located on the first heat source and connected to the third outlet on the regenerator. The outlet end of the working fluid conveying pipe is located on the second heat source and connected to the second inlet on the steam turbine.

[0010] The working fluid conveying pipe arranged in the first heat source can exchange heat with the water in the water medium flow channel; the working fluid conveying pipe arranged in the second heat source can exchange heat with the flue gas in the flue gas flow channel.

[0011] Optionally, the exhaust pipe is connected to the inlet end of the flue gas composition treatment unit, and the connecting pipe located at the outlet end of the flue gas composition treatment unit is connected to the flue gas flow channel located inside the second heat source.

[0012] Optionally, the water medium flow channel includes a plurality of expansion sections arranged alternately in the water flow direction. The flow cross-section of the aforementioned expansion sections is larger than the flow cross-section of the main body of the water medium flow channel. Furthermore, a baffle assembly is provided within the aforementioned expansion sections, and the baffle assembly can generate turbulence at least in the vertical direction when the water flows through the expansion sections.

[0013] Multiple heat exchange sections are formed on the working fluid delivery pipe arranged in the first heat source, extending into the water medium flow channel, and the heat exchange sections are arranged on both sides of the expansion section.

[0014] Optionally, multiple heat exchange sections are connected in series on both sides of the aforementioned expansion section.

[0015] Optionally, the heat exchange part comprises a plurality of U-shaped fins arranged in parallel, and the direction in which the plurality of U-shaped fins are arranged alternately is perpendicular to the direction of water flow.

[0016] The ports of the U-shaped channels arranged in the U-shaped fins are connected to the cavity bodies arranged in the water medium flow or the bodies of the working medium conveying pipes arranged in the first heat source.

[0017] Optionally, the volume of the cavity body is greater than the sum of the volumes of the plurality of U-shaped channels arranged on the single heat exchange part.

[0018] Optionally, the water medium flow channel comprises two side cavities arranged alternately in the up-down direction and a middle cavity arranged between the two side cavities.

[0019] A plurality of expansion portions are formed alternately on the two side cavities and in the direction of water flow.

[0020] The heat exchange parts arranged on the two side cavities are connected in series, and the ports of the U-shaped channels on each heat exchange part are connected to the cavity bodies arranged in the water medium flow channel or the bodies of the working medium conveying pipes arranged in the first heat source in the middle cavity.

[0021] Optionally, the overall flow direction of the fluid in the working medium conveying pipe arranged in the first heat source is opposite to the direction of water flow in the water medium flow channel.

[0022] Optionally, the flue gas flow channel comprises a plurality of expansion portions arranged alternately in the direction of high-temperature flue gas flow, and the flow cross section of the expansion portion is greater than that of the main body of the flue gas flow channel. A spoiler group is arranged in the expansion portion, and the spoiler group can generate turbulence in the vertical direction when the flue gas flows through the expansion portion. A plurality of heat exchange parts extending into the flue gas flow channel are formed on the working medium conveying pipe arranged in the second heat source, and the heat exchange parts are arranged on both sides of the expansion portion.

[0023] The working medium conveying pipe arranged in the first heat source and the working medium conveying pipe arranged in the second heat source are connected in series, so that the working medium exchanges heat with the cooling water in the first heat source and then flows into the second heat source to exchange heat with the flue gas.

[0024] Preferably, a plurality of heat exchange portions are arranged in series on both sides of the expansion portion provided on the flue gas flow channel; further, the heat exchange portion can include a plurality of U-shaped fins arranged in parallel, and the direction in which the plurality of U-shaped fins are distributed alternately is perpendicular to the direction of the flue gas flow; the ports of the U-shaped cavities provided in the U-shaped fins are connected to the cavity bodies arranged in the flue gas flow channel or the bodies of the working medium conveying pipes provided on the second heat source; further, the volume of the cavity body is greater than the sum of the volumes of the plurality of U-shaped cavities arranged on the single heat exchange portion; further, the flue gas flow channel includes two side cavities alternately arranged in the upper and lower directions and a middle cavity arranged between the two side cavities; a plurality of expansion portions are alternately formed on both side cavities in the direction of the flue gas flow; the heat exchange portions arranged on both side cavities are connected in series, and the ports of the U-shaped cavities on each heat exchange portion are connected to the cavity bodies or the bodies of the working medium conveying pipes in the middle cavity; further, the overall flow direction of the fluid in the working medium conveying pipe arranged in the second heat source is opposite to the direction of the flue gas flow in the flue gas flow channel.

[0025] Optionally, a plurality of water medium flow channels are arranged in parallel in the first heat source, and a plurality of working medium conveying pipes are correspondingly arranged, and heat exchange can be carried out between the plurality of water medium flow channels and the plurality of working medium conveying pipes. The water inlet of the plurality of water medium flow channels is connected to the water outlet pipe, and the water outlet is connected to the pipe fitting.

[0026] A plurality of flue gas flow channels are arranged in parallel in the second heat source, and a plurality of working medium conveying pipes are correspondingly arranged, and heat exchange can be carried out between the plurality of flue gas flow channels and the plurality of working medium conveying pipes. The flue gas inlet of the plurality of flue gas flow channels is connected to the flue gas outlet pipe or the connecting pipe, and the flue gas outlet is connected to the pipe fitting.

[0027] The plurality of working medium conveying pipes arranged in the first heat source are connected in series one by one with the plurality of working medium conveying pipes arranged in the second heat source. In this way, the working medium is divided into the plurality of working medium conveying pipes in the first heat source from the inlet end, then flows into the plurality of working medium conveying pipes arranged in the second heat source one by one, and finally flows into the outlet end after being heated, and flows to the steam turbine for work, realizing the conversion of heat energy to electric energy.

[0028] The beneficial effects of the present application are: the calcination furnace waste heat utilization equipment provided by the present application can realize the recycling of the heat / waste heat contained in the flue gas and the cooling water jacket of the calcination furnace, is helpful for the construction of the calcination furnace waste heat utilization system, and realizes the purpose of energy saving and environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0030] Figure 2This is a cross-sectional schematic diagram of the heat exchange pipe structure located within the first heat source.

[0031] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0032] Figure 4 This is a top (or bottom) view of the structure when the heat exchange section is matched with the cavity.

[0033] Figure 5 This is a side view of the structure when the heat exchange section is matched with the cavity.

[0034] In the diagram: 100 Furnace body, 101 Cooling water jacket, 1011 Water outlet pipe, 102 Exhaust pipe, 103 Flue gas composition treatment unit, 1031 Connecting pipe 1; 10 Compressor, 1.2 First outlet, 6.1 First inlet; 20 Regenerator, 2.6 Second outlet, 2.31 Third outlet; 30 Heat source, 31 First heat source, 31.1 Pipe fitting 1, 311 Heat source box wall, 312 Heat medium channel, 312 1 Side cavity, 3122 Intermediate cavity, 3123 Expansion section, 31231 Top surface, 3124 Baffle assembly, 313 Working fluid conveying pipe, 3131 Heat exchange section, 3132 Cavity, 3133 Neck, 32 Second heat source, 32.1 Pipe fitting two, 33 Connecting pipe two, 2.32 Inlet end, 3.41 Outlet end; 40 Steam turbine, 3.42 Second inlet, 4.2 Fourth outlet; 50 Generator; 60 Cooler. Detailed Implementation

[0035] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0036] like Figures 1 to 5 The waste heat recovery equipment for the calcining furnace shown includes a furnace body 100. A cooling water jacket 101 is provided at the discharge end of the lower part of the furnace body 100. An exhaust pipe 102 extends from the furnace body 100 to deliver the flue gas generated during combustion out of the furnace. The aforementioned technical features of the furnace body 100 are prior art and will not be described in detail.

[0037] In the technical solution of the present application, a compressor 10, a regenerator 20, a heat source 30, a matching steam turbine 40 and a generator 50, and a cooler 60 are further included. The steam turbine 40 can provide power for the generator 50, so that the generator 50 generates electricity, and the conversion from heat energy to electric energy is completed. The heat source 30 includes a first heat source 31, a second heat source 32, and a working medium conveying pipe 313 arranged in series in the two heat sources (i.e. the first heat source 31 and the second heat source 32). That is, the working medium conveying pipe 313 arranged in the first heat source 31 and the working medium conveying pipe 313 arranged in the second heat source 32 are connected in series, so that the working medium first exchanges heat with the low-temperature cooling water in the first heat source 31, and then flows into the second heat source 32 to exchange heat with the high-temperature flue gas.

[0038] A plurality of working medium pipes can be arranged in parallel in the two heat sources, respectively, and the plurality of parallel working medium pipes are connected by a plurality of connecting pipes 33 to form a plurality of parallel paths connected in series between the two heat sources. At this time, the working medium enters the first heat source 31 from the inlet end 2.32 of the working medium conveying pipe 313, and is divided into a plurality of parallel flow channels to participate in the heat exchange process, respectively. The plurality of working medium flows can flow into the plurality of parallel flow channels arranged in the second heat source 32 through the connecting pipe 33, complete the heat exchange, and finally flow out of the second heat source 32 through the outlet end 3.41 of the working medium conveying pipe 313 to enter the steam turbine 40.

[0039] The outlet pipe 1011 of the cooling water jacket 101 is connected with a water medium flow channel arranged inside the first heat source 31 (see the heat medium passage 312 in Figure 5 ). The drainage end of the water medium flow channel is provided with a pipe fitting 31.1 connectable with the outside (such as a water tower). The exhaust pipe 102 is connected with a flue gas flow channel arranged inside the second heat source 32 (see the heat medium passage 312 in Figure 5 ). The flue gas flow channel is provided with a pipe fitting 32.1 connectable with the outside (such as a chimney).

[0040] The first outlet 1.2 of the compressor 10 and the fourth outlet 4.2 of the steam turbine 40 are respectively connected with the two input end of the regenerator 20, so that the working medium output by the compressor 10 can exchange heat with the exhaust gas discharged from the steam turbine 40 in the regenerator 20.

[0041] The cooler 60 is arranged between the first inlet 6.1 of the compressor 10 and the second outlet 2.6 of the regenerator 20. The inlet end 2.32 of the working medium conveying pipe 313 is arranged on the first heat source 31 and connected with the third outlet 2.31 of the regenerator 20. The outlet end 3.41 of the working medium conveying pipe 313 is arranged on the second heat source 32 and connected with the second inlet 3.42 of the steam turbine 40.

[0042] The working medium conveying pipe 313 arranged in the first heat source 31 can exchange heat with water in the water medium flow channel; the working medium conveying pipe 313 arranged in the second heat source 32 can exchange heat with flue gas in the flue gas flow channel.

[0043] For example, the working medium used is S-CO2 working medium, and the working process is as follows: the low-temperature S-CO2 working medium is pressurized by the compressor 10, exchanges heat with the exhaust gas discharged from the regenerator 20 to the steam turbine 40, is preheated to a certain temperature, enters the heat source 30, is further heated by the heat source, expands to do work in the steam turbine 40, drives the generator 50 to operate to generate electricity, and the exhaust gas is discharged from the cylinder of the steam turbine 40, exchanges heat with the working medium discharged from the compressor 10 in the regenerator 20 to achieve the purpose of pre-cooling, and the cooled working medium enters the cooler 60 for further cooling and then enters the compressor 10 for compression to complete the entire cycle. When the working medium flows into the heat source 30, it first exchanges heat with hot water (discharged from the discharge pipe 1011 of the cooling water jacket 101) flowing through the first heat source 31 on the upstream side, fully absorbs the heat in the low-temperature waste heat discharged from the cooling water jacket 101, then exchanges heat with hot flue gas flowing through the second heat source 32, is heated to a high-temperature state, and finally flows into the steam turbine 40 to generate high-temperature steam to drive the generator 50 to operate to generate electricity, achieving the purpose of converting heat energy into electrical energy.

[0044] To prolong the service life of the flue gas flow channel arranged in the second heat source 32 and reduce maintenance and operation costs, the scheme of the present application further comprises a flue gas component treatment unit 103 (or a flue gas treatment unit), which can treat the (harmful) components in the high-temperature flue gas discharged from the furnace body (calcination furnace), such as at least desulfurization treatment, to reduce the corrosiveness of the flue gas. The flue gas discharge pipe 102 is connected with the inlet end of the flue gas component treatment unit 103, and the connecting pipe one 1031 arranged at the discharge end of the flue gas component treatment unit 103 is connected with the flue gas flow channel arranged inside the second heat source 32. The high-temperature flue gas after the pre-treatment is sent into the flue gas flow channel inlet arranged inside the second heat source 32 by the connecting pipe one 1031 to participate in the heat exchange process.

[0045] like Figures 2 to 5 As shown, the water medium flow channel includes a channel disposed along the water flow direction (along...). Figure 2 Multiple expansion sections 3123 are arranged alternately on the X-direction (as shown in the positive direction). The flow cross-section of each expansion section 3123 is larger than that of the main body of the water medium flow channel. In the case shown in the figure, the width of the expansion section 3123 in the vertical direction is greater than the width of the main body of the water medium flow channel (which can be understood as the part of the water medium flow channel excluding the expansion section 3123) in the vertical direction. This allows the water flow to have a larger / longer path in the vertical direction at the expansion section 3123, which can fully turbulentize the flow and promote the temperature and mass transfer effect within the water body itself. This promotes the uniform distribution of heat, which is beneficial for subsequent heat exchange (between the heat exchange section 3131 on the working medium conveying pipe 313) and promotes the recovery and utilization of the heat contained in the low-temperature water body.

[0046] The working fluid delivery pipe 313 has multiple heat exchange sections 3131 extending into the water medium flow channel, and the heat exchange sections 3131 are distributed on both sides of the expansion section 3123. When the water flows in the water medium flow channel, it can contact the wall of the heat exchange section 3131, thereby achieving the purpose of heat exchange with the working fluid flowing in the heat exchange section 3131.

[0047] The heat medium channel 312 is fixed on the heat source box wall 311 of the first heat source 31. Specifically, multiple layers of the heat medium channel 312 can be vertically arranged alternately in the first heat source 31, and these multiple layers of heat medium channels 312 are connected in parallel. The low-temperature hot water delivered to the first heat source 31 by the water outlet pipe 1011 is divided into multiple streams, which exchange heat with the working medium in the working medium conveying pipe 313 respectively. At that time, the working fluid conveying pipe 313 arranged in the first heat source 31 can be multiple pipes connected in parallel, and these multiple pipes are matched one-to-one with multiple (parallel) heat medium channels 312 to perform heat exchange respectively; correspondingly, multiple pipes can be arranged in the second heat source 32 to be connected one-to-one with the multiple parallel (working fluid) pipes in the first heat source 31, to be distributed in the high temperature flue gas for heat exchange, and the working fluid can be converged at the outlet end 3.41 of the working fluid conveying pipe 313 and flow to the steam turbine 40.

[0048] The top surface 31231 of the expansion part 3123 is close to the arrangement side of the working medium conveying pipe 313 (including the cavity body 3132 arranged thereon), and the bottom surface of the expansion part 3123 is close to the outer wall of the heat medium passage 312. The spoiler group 3124 is arranged in the expansion part 3123, and the spoiler group 3124 can generate turbulence in the vertical direction when the water body flows through the expansion part 3123, so as to promote the mass transfer mixing effect inside the low-temperature water body flowing in the water medium flow channel, homogenize the water body temperature, facilitate the subsequent heat exchange process, and promote the recovery of heat energy.

[0049] Specifically, the spoiler group 3124 includes at least three spoilers, and the three spoilers are distributed in the water flow direction; the free end of the spoiler on the upstream side (referred to as spoiler one) extends to one side of the spoiler in the middle (referred to as spoiler two) in the direction close to the top surface 31231, and the inclined extension direction intersects the middle lower part of the spoiler two (the spoiler in the middle); the free end of the spoiler two (the spoiler in the middle) extends to one side of the spoiler on the downstream side (referred to as spoiler three) in the direction away from the top surface 31231, and the inclined extension direction intersects the middle lower part (preferably close to the lower part) of the spoiler three (the spoiler on the downstream side); the free end of the spoiler three (the spoiler on the downstream side) extends to the downstream side thereof in the direction close to the top surface 31231, and close to the top surface 31231.

[0050] When the water body flows in the water medium flow channel, it is diverted to flow to one side of the top surface 31231 at the expansion part 3123 due to the blockage of the spoiler one, then is diverted to flow away from one side of the top surface 31231 due to the blockage of the spoiler two, and then is diverted to flow to one side of the top surface 31231 again due to the blockage of the spoiler three. In this way, after multiple diversion flows, the temperature mass transfer effect inside the water body is promoted, the temperature of the water body tends to be uniform, sufficient heat exchange between the water body and the heat exchange part 3131 can be performed in the continuous flow process, and the recovery effect of heat energy is improved.

[0051] A plurality of heat exchange parts 3131 can be arranged in series on both sides of each expansion part 3123. The number of heat exchange parts 3131 arranged on both sides of each expansion part 3123 can be partially the same or completely different.

[0052] Each heat exchange part 3131 includes a plurality of U-shaped fin plates arranged in parallel, and the direction in which the plurality of U-shaped fin plates are distributed is perpendicular to the water flow direction (that is, the direction in which the plurality of U-shaped fin plates are distributed is perpendicular to the X direction in the vertical view, and at this time, the plurality of U-shaped fin plates of the same heat exchange part 3131 are distributed in the direction perpendicular to the plane; if not, in the left-right direction in the view). Figure 2 Figure 5 ​​

[0053] Two ends of the U-shaped cavity formed in the U-shaped fin plate are communicated to the body of the cavity 3132 or the working medium conveying pipe 313. That is, one end (outer end) of the U-shaped cavity in the U-shaped fin plate located on the two end sides of the heat medium passage 312 is connected with the body of the working medium conveying pipe 313, and the U-shaped cavities in the U-shaped fin plates located between the two end sides of the heat medium passage 312 are connected together in series through the cavity 3132, as shown in Figure 2 .

[0054] The volume of the cavity 3132 is greater than the sum of the volumes of the plurality of U-shaped cavities provided on the single heat exchange part 3131. In this way, after the working medium flows into the cavity 3132 from the U-shaped fin plate, the working medium can be fully mixed and then re-divided to flow to the U-shaped fin plate (or U-shaped fin plate group) on the downstream side (in the working medium flow direction).

[0055] As shown in Figure 2 , the water medium flow passage includes two side cavities 3121 distributed alternately in upper and lower positions and an intermediate cavity 3122 provided between the two side cavities 3121. A plurality of expansion parts 3123 are formed alternately on the two side cavities 3121 and in the water flow direction. The heat exchange parts 3131 provided on the two side cavities 3121 are connected in series, and the ports of the U-shaped cavities on each heat exchange part 3131 are connected in abutment with the body of each cavity 3132 or working medium conveying pipe 313 in the intermediate cavity 3122.

[0056] The flow direction of the fluid (i.e., working medium) in the working medium conveying pipe 313 is opposite to the water flow direction in the water medium flow passage. That is, the overall flow direction of the working medium in the working medium conveying pipe 313 is along the negative direction of X.

[0057] The specific structure of the flue gas flow passage provided in the second heat source 32 and the matching structure between the working medium conveying pipe 313 provided in the second heat source 32 can be referred to the matching structure between the water medium flow passage and the working medium conveying pipe 313 provided in the first heat source 31 as shown in Figures 2 to 5 . Therefore, the heat source tank wall 311 shown in Figure 2 can also be understood as the tank wall of the second heat source 32, and the heat medium passage 312 can also be understood as a high-temperature flue gas passage.

[0058] A neck part 3133 is formed on each U-shaped fin plate on the heat exchange part 3131 at a position where the U-shaped fin plate connects with the cavity 3132, as shown in Figure 3 . The neck part 3133 is correspondingly arranged on the two side walls of the intermediate cavity 3122 to make the ports of the U-shaped cavities on each U-shaped fin plate extend into the intermediate cavity 3122 and communicate with the cavity 3132.

[0059] In the technical solution of the present application, first, the low-temperature working medium exchanges heat with the cooling water discharged from the cooling jacket 101 to fully absorb the low-temperature preheating contained in the cooling water discharged from the cooling jacket 101. The split heat exchange of the cooling water can promote the absorption effect of the low-temperature preheating, the expansion part 3123 and the heat exchange part 3131 associated structure can promote the full release and absorption of the heat in the water body (the degree of recovery is improved), the optimized working medium flow path (the setting of the cavity 3132 and the U-shaped fin plate group structure, etc.) can improve the heat exchange efficiency of the working medium and increase its heat recovery capacity. After the working medium is heated in the first heat source 31, it enters the second heat source 32 and exchanges heat with the high-temperature flue gas, and is significantly heated to a high-temperature state, and finally flows into the steam turbine 40 for utilization, realizing the purpose of preheating and recycling the cooling water of the cooling jacket 101 and the high-temperature flue gas discharged from the exhaust gas pipe 102, and completing the heat energy to electric energy conversion and recovery process. It can be seen that the calcination furnace waste heat utilization equipment provided by the present application can realize the recycling purpose of the heat energy / waste heat contained in the flue gas discharged from the calcination furnace and the cooling water discharged from the cooling jacket, which is helpful for the construction of the calcination furnace waste heat utilization system, and realizes the purpose and effect of energy saving and environmental protection.

[0060] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. The present application can be improved in many aspects without departing from the general idea, and those skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical idea disclosed by the present application should be covered by the claims of the present application.

Claims

1. A calcining furnace waste heat utilization equipment, comprising a furnace body (100) provided with a cooling water jacket (101) and a flue gas pipe (102); characterized in that: The compressor (10), the regenerator (20), the heat source (30), the matched steam turbine (40) and the generator (50), and the cooler (60) are further included; the heat source (30) includes the first heat source (31), the second heat source (32) and the working medium conveying pipe (313) arranged in series between the two heat sources; The water outlet pipe (1011) of the cooling water jacket (101) is connected with the water medium flow channel arranged inside the first heat source (31); the water discharge end of the water medium flow channel is provided with the pipe fitting one (31.1) capable of being connected with the outside; the flue gas discharge pipe (102) is connected with the flue gas flow channel arranged inside the second heat source (32); the flue gas discharge end of the flue gas flow channel is provided with the pipe fitting two (32.1) capable of being connected with the outside; The first outlet (1.2) on the compressor (10) and the fourth outlet (4.2) on the steam turbine (40) are respectively connected with the regenerator (20); the cooler (60) is arranged between the first inlet (6.1) on the compressor (10) and the second outlet (2.6) on the regenerator (20); The inlet end (2.32) of the working medium conveying pipe (313) is arranged on the first heat source (31) and connected with the third outlet (2.31) on the regenerator (20); the outlet end (3.41) of the working medium conveying pipe (313) is arranged on the second heat source (32) and connected with the second inlet (3.42) on the steam turbine (40); The working medium conveying pipe (313) arranged in the first heat source (31) can exchange heat with the water in the water medium flow channel; the working medium conveying pipe (313) arranged in the second heat source (32) can exchange heat with the flue gas in the flue gas flow channel.

2. The calcining furnace waste heat utilization apparatus according to claim 1, characterized by: The flue gas discharge pipe (102) is connected with the inlet end of the flue gas component treatment unit (103); the discharge end of the flue gas component treatment unit (103) is connected with the flue gas flow channel arranged inside the second heat source (32) through the connecting pipe one (1031).

3. The calcining furnace waste heat utilization apparatus according to claim 1, characterized by: The water medium flow channel includes a plurality of expansion portions (3123) arranged in the water flow direction and distributed alternately; the flow passage cross section of the expansion portion (3123) is larger than that of the main body of the water medium flow channel; the flow spoiler group (3124) is arranged in the expansion portion (3123) and can make the water flow generate turbulence at least in the vertical direction when passing through the expansion portion (3123); The working medium conveying pipe (313) arranged in the first heat source (31) is formed with a plurality of heat exchange portions (3131) extending into the water medium flow channel, and the heat exchange portions (3131) are distributed on both sides of the expansion portion (3123).

4. The calcining furnace waste heat utilization apparatus according to claim 3, characterized by: A plurality of heat exchange portions (3131) are arranged in series on both sides of the expansion portion (3123).

5. The calcining furnace waste heat utilization apparatus according to claim 3, characterized by: The heat exchange portion (3131) includes a plurality of U-shaped fin plates arranged in parallel, and the direction in which the plurality of U-shaped fin plates are distributed alternately is perpendicular to the water flow direction; the ports of the U-shaped cavities arranged on the U-shaped fin plates are connected to the cavity body (3132) or the body of the working medium conveying pipe (313).

6. The calcining furnace waste heat utilization apparatus according to claim 5, characterized by: The volume of the cavity body (3132) is larger than the sum of the volumes of the plurality of U-shaped cavities arranged on the single heat exchange portion (3131).

7. The calcining furnace waste heat utilization apparatus according to claim 5, characterized by: The water medium flow channel comprises two side cavities (3121) arranged alternately in up and down directions and a middle cavity (3122) arranged between the two side cavities (3121); A plurality of expansion sections (3123) are formed alternately on the two side cavities (3121) in the water flow direction; The heat exchange sections (3131) arranged on the two side cavities (3121) are connected in series, and the ports of the U-shaped cavities on each heat exchange section (3131) are connected to the middle cavity (3122) in butt joint mode with each cavity body (3132) or the body of the working medium conveying pipe (313).

8. The calcining furnace waste heat utilization apparatus according to claim 3, characterized by: The fluid flow direction in the working medium conveying pipe (313) is opposite to the water flow direction in the water medium flow channel.

9. The calcining furnace waste heat utilization apparatus according to claim 3, characterized by: The flue gas flow channel comprises a plurality of expansion sections (3123) arranged alternately in the high-temperature flue gas flow direction, the flow passage cross section of the expansion section (3123) is larger than that of the main body of the flue gas flow channel, a spoiler group (3124) is arranged in the expansion section (3123), and the spoiler group (3124) can generate at least vertical disturbance when the flue gas flows through the expansion section (3123); the working medium conveying pipe (313) arranged in the second heat source (32) is provided with a plurality of heat exchange sections (3131) extending into the flue gas flow channel, and the heat exchange sections (3131) are arranged on both sides of the expansion section (3123).

10. The calcining furnace waste heat utilization apparatus according to claim 1, characterized by: A plurality of water medium flow channels are arranged in parallel in the first heat source (31), and a plurality of working medium conveying pipes (313) are arranged corresponding to the plurality of water medium flow channels, and heat exchange can be carried out between the plurality of water medium flow channels and the plurality of working medium conveying pipes (313); A plurality of flue gas flow channels are arranged in parallel in the second heat source (32), and a plurality of working medium conveying pipes (313) are arranged corresponding to the plurality of flue gas flow channels, and heat exchange can be carried out between the plurality of flue gas flow channels and the plurality of working medium conveying pipes (313); The plurality of working medium conveying pipes (313) arranged in the first heat source (31) and the plurality of working medium conveying pipes (313) arranged in the second heat source (32) are connected in series in one-to-one correspondence.

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