WO2023173902A1

WO2023173902A1 - Waste-heat recovery system matching hismelt smelting reduction ironmaking system

Info

Publication number: WO2023173902A1
Application number: PCT/CN2022/143823
Authority: WO
Inventors: 钱飞舟; 朱泓; 魏兆强
Original assignee: 苏州海陆重工股份有限公司; 苏州海陆节能环保技术研究所有限公司
Priority date: 2022-03-14
Filing date: 2022-12-30
Publication date: 2023-09-21
Also published as: CN114636316B; CN114636316A

Abstract

Disclosed in the present invention is a waste-heat recovery system matching a HIsmelt smelting reduction ironmaking system, the waste-heat recovery system comprising: a cooling flue and a flue steam drum, wherein an outlet end of the cooling flue is provided with a connection flue, an outlet of the connection flue is connected to a separator, an inlet section of the cooling flue is connected to a reaction furnace, and a cooling medium is introduced into the connection flue to cool flue gas; and a flue gas outlet of the separator is connected to a steam superheater, a superheater flue gas outlet of the steam superheater is connected to a fire-tube boiler, a boiler ascending tube and a boiler descending tube of the fire-tube boiler are connected to a boiler steam drum, the fire-tube boiler is connected to a fire-tube economizer, a flue gas discharge cylinder body is arranged at the bottom of the fire-tube economizer, an economizer water output tube on the fire-tube economizer supplies water to the fire-tube boiler steam drum and the flue steam drum, and steam output by the flue steam drum and the fire-tube boiler steam drum is conveyed to the steam superheater, and the steam superheater is provided with a superheated steam output tube. The present invention can effectively prevent a slagging phenomenon and significantly improve thermal efficiency.

Description

Waste heat recovery system supporting Hesmet smelting reduction ironmaking system

Technical field

The invention relates to a waste heat recovery system, in particular to a waste heat recovery system matched to the HISMELT smelting reduction ironmaking system.

Background technique

HISMELT is translated into Haismet according to the Chinese pronunciation. HISMELT smelting reduction ironmaking technology is a short-process ironmaking technology that uses non-coking coal and iron ore powder to produce liquid iron by injection. Because it does not require the original coke process and pellet process of ironmaking, and directly uses coal powder and iron ore powder to make iron, it has the advantages of strong raw material adaptability, low environmental pollution, and high product quality. The factory construction is relatively simple. It has extremely high social, economic and environmental value. Smelting reduction ironmaking technology is a technological improvement in blast furnace ironmaking technology, in which the waste heat recovery system is a key part of the entire system.

The HISMELT reactor in the HISMELT smelting reduction ironmaking system, also known as the reduction furnace, produces high-temperature flue gas with a pressure close to 1.0 bar and a temperature of about 1450°C. The high-temperature flue gas contains combustible gases such as CO and H ₂ , and also contains a large amount of Bonded dust in a molten state. The waste heat recovery system in the HISMELT smelting reduction ironmaking system converts the heat energy in the high-temperature flue gas into steam to generate electricity.

The current waste heat recovery system in the HISMELT smelting reduction ironmaking system. The specific structure can be found in Chinese patent application CN103773912A. It mainly includes: a flue connected to the reduction furnace. The flue includes an ascending section and a descending section. The ascending section flue and the descending section The upper ends of the flue sections are connected by a transition flue, and the lower end of the descending flue section is provided with a connecting flue. The connecting flue is connected to the high-temperature cyclone separator, and the flue gas outlet of the high-temperature cyclone separator is connected to the waste heat boiler. . The high-temperature flue gas generated by the reduction furnace releases heat sequentially through the ascending flue, the transition flue, and the descending flue, and then enters the high-temperature cyclone separator through the connecting flue. The high-temperature cyclone separator removes large particles in the high-temperature flue gas. After removal, the high-temperature flue gas with large particles removed enters the waste heat boiler for heat transfer.

The above-mentioned waste heat recovery system in the HISMELT smelting reduction ironmaking system has the following technical problems during operation: the high-temperature flue gas after removing large particles through the high-temperature cyclone separator still contains a large number of high-temperature bonded dust with smaller particle diameters. , the characteristic of this kind of high-temperature bonded dust particles is that their surface temperature is relatively low, but their internal core temperature is still very high, that is, the small-sized bonded dust remaining in the high-temperature gas has not been completely cooled. Such high-temperature bonded dust particles The agglomerated dust is very easy to adhere to the wall of the heat exchange tube in the waste heat boiler, thus forming slagging on the wall of the heat exchange tube, and more and more accumulated dust can easily lead to large pieces falling off and clogging. As time goes by, the heat exchange effect of waste heat boilers continues to decrease, and safety hazards become more and more serious.

Contents of the invention

The purpose of this invention is to provide a waste heat recovery system that is matched to the Hesmet smelting reduction ironmaking system. The waste heat recovery system can solve the technical problem of slagging on the walls of heat exchange tubes caused by particulate matter in high-temperature flue gases. , and further greatly improve the heat recovery efficiency.

In order to achieve the above purpose, the technical solution adopted by the present invention is: a waste heat recovery system matched to the Hesmet smelting reduction ironmaking system, including: a cooling flue with a membrane water-cooled wall structure, and a smoke duct with a membrane water-cooled wall cooling the flue. The water-cooled wall rising pipe and the flue water-cooled wall descending pipe are connected to the flue drum. The outlet end of the cooling flue is provided with a connecting flue. The outlet of the connecting flue is connected to a separator for separating solid particles in the gas. The cooling The flue includes an entrance section cooling flue. The entrance section cooling flue is connected to the reactor. The entrance section cooling flue is gradually tilted upward from the reactor. The angle between the entrance section cooling flue and the horizontal direction is greater than or equal to 45 degrees and less than or equal to 60 degrees, the molten slag in the high-temperature flue gas in the entrance section cooling flue can flow back to the reaction furnace along the entrance section cooling flue. The temperature of the flue gas at the outlet end of the cooling flue is controlled between 750°C and 1000°C. The cooling medium is introduced into the flue to cool the flue gas entering the connecting flue to 600℃~700℃; the flue gas outlet of the separator is connected to the steam superheater, and the superheater flue gas outlet of the steam superheater is connected to the fire tube boiler. The boiler riser and boiler downcomers of the fire tube boiler are connected to the boiler drum. The fire tube boiler is connected to the fire tube economizer through the transition smoke chamber. The bottom of the fire tube economizer is provided with a flue gas outlet. The discharge cylinder, the fire tube economizer is provided with an economizer water inlet pipe and an economizer water outlet pipe. The economizer outlet pipe is connected to the fire tube boiler drum water supply pipe and the flue drum water supply pipe. The fire tube boiler steam drum The package water supply pipe is connected to the fire tube boiler steam drum, the flue steam drum water supply pipe is connected to the flue steam drum, the flue steam drum is provided with a flue steam drum steam output pipe, and the fire tube boiler steam drum is provided with a saturated steam output pipe. , the flue drum steam output pipe and the saturated steam output pipe are convergently connected to the superheater steam input end of the steam superheater, and a superheated steam output pipe is provided on the steam superheater.

Further, in the aforementioned waste heat recovery system matched to the Hesmet smelting reduction ironmaking system, the cooling medium uses cooling water, or the flue gas output from the flue gas outlet of the flue gas discharge cylinder is desulfurized. And used as cooling medium after dust removal and purification.

Further, in the aforementioned waste heat recovery system matched to the Hesmet smelting reduction ironmaking system, the cooling medium in the connecting flue is injected through nozzles, and the nozzles are arranged at the top, bottom and both sides of the connecting flue. The nozzles on the inner wall of the connecting flue, the top, the bottom and both sides of the connecting flue are all arranged at intervals along the length of the connecting flue.

Furthermore, in the aforementioned waste heat recovery system supporting the Hesmet smelting reduction ironmaking system, the cooling flue also includes a roundabout section cooling section flue, and the roundabout section cooling flue includes vertical and The ascending section cooling flue and the descending section cooling flue are arranged in parallel intervals. The upper ends of the ascending section cooling flue and the descending section cooling flue are connected by the transition section cooling flue. The lower end of the ascending section cooling flue is connected with the inlet section cooling flue. The upper end of the channel is connected, and the bottom of the descending section cooling flue is connected to the descending section smoke exhaust barrel. A cooling flue ash outlet is set on the bottom of the descending section smoke exhaust barrel, and the connecting flue is connected to the descending section smoke exhaust barrel.

Furthermore, the aforementioned waste heat recovery system supporting the Hesmet smelting reduction ironmaking system, in which the transition section cooling flue includes: a mirror-image set of first-stage cooling flue and a second-stage cooling flue, and a first-stage cooling flue. The cooling flue of the second section curves upward from the top of the cooling flue in the ascending section and towards the cooling flue in the descending section. The cooling flue in the second section curves upward from the top of the cooling flue in the descending section and bends in the direction of the cooling flue in the ascending section. The cooling flue in the turning section The cooling flue is connected to the second section of the cooling flue at the top.

Furthermore, in the aforementioned waste heat recovery system supporting the Hesmet smelting reduction ironmaking system, two flue gas explosion-proof valves are provided at the top of the transition section cooling flue, and the two flue gas explosion-proof valves are respectively located in the cooling section of the corner. The flue and the second cooling section of the turning flue.

Further, in the aforementioned waste heat recovery system matched to the Hesmet smelting reduction ironmaking system, the heating tube in the steam superheater adopts a serpentine heating tube.

Furthermore, in the aforementioned waste heat recovery system supporting the Hesmet smelting reduction ironmaking system, both the fire tube boiler and the fire tube economizer are vertical structures.

The advantages of the present invention are: 1. The inlet section cooling flue is gradually tilted upward from one end of the reaction furnace, and the angle between the inlet section cooling flue and the horizontal direction is greater than or equal to 45 degrees and less than or equal to 60 degrees, which can make high-temperature smoke The molten slag in the gas flows back into the reactor along the inlet cooling flue, thereby effectively reducing the amount of molten particulate matter in the high-temperature flue gas at the source of the waste heat recovery system, and effectively avoiding slagging in the waste heat recovery system equipment. 2. Control the temperature of the high-temperature flue gas output from the cooling flue at 750°C to 1000°C, and spray cooling medium into the connecting flue to further cool the high-temperature flue gas to 600°C to 700°C, which makes the high-temperature flue gas The particles in the high-temperature flue gas are completely cooled, that is, the core of the particles in the high-temperature flue gas is no longer molten. This can prevent the particles from adhering to the wall of the heat exchange tube and causing slagging after the high-temperature flue gas enters the heat exchange equipment. , thereby effectively improving the heat exchange effect and extending the service life of the waste heat recovery system. 3. Based on the first two points, the waste heat recovery system uses a steam superheater. The setting of the steam superheater greatly improves the heat recovery efficiency and reduces the temperature of the outlet flue gas. That is, the temperature of the final exhaust flue gas is effectively reduced. After the temperature is lowered, The flue gas can be directly purified by dry dust removal, such as direct bag dust removal, which effectively saves the cost of exhaust gas purification. 4. Fire tube boilers and fire tube economizers are both vertical structures, adopt longitudinal flushing, and have good self-cleaning effect, which can effectively improve the heat exchange effect of heat exchange equipment and extend the service life of the equipment.

Description of the drawings

Figure 1 is a schematic structural diagram of the waste heat recovery system matched to the Hesmet smelting reduction ironmaking system according to the present invention.

Figure 2 is a schematic structural diagram of the cooling flue in Figure 1.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

As shown in Figure 1 and Figure 2, the waste heat recovery system supporting the Hesmet smelting reduction ironmaking system includes: cooling flue 1 with a membrane water-cooled wall structure, and water-cooled flue with a membrane water-cooled wall for cooling flue 1 The wall rising pipe 21 and the flue water-cooled wall descending pipe 22 are connected to the flue drum 2 . The cooling flue 1 includes an entrance section cooling flue 11. The entrance section cooling flue 11 is connected to the reaction furnace 3. The entrance section cooling flue 11 is gradually inclined upward from the reaction furnace 3. The entrance section cooling flue 11 is oriented horizontally. The angle θ is greater than or equal to 45 degrees and less than or equal to 60 degrees. The molten slag in the high-temperature flue gas in the inlet section cooling flue 11 can flow back to the reaction furnace 3 along the inlet section cooling flue 11. The temperature of the flue gas at the outlet end of the cooling flue 1 is controlled to 750°C to 1000°C.

In this embodiment, the cooling flue 1 also includes a circuitous section cooling section flue 12. The circuitous section cooling flue 12 includes an ascending section cooling flue 121 and a descending section cooling flue 122 arranged vertically and in parallel. The upper ends of the ascending section cooling flue 121 and the descending section cooling flue 122 are connected by the transition section cooling flue. The lower end of the ascending section cooling flue 121 is connected with the upper end of the entrance section cooling flue 11. The descending section cooling flue 122 A descending section smoke exhaust cylinder 123 is connected to the bottom, and a cooling flue ash outlet 124 is provided on the bottom of the descending section smoke exhaust cylinder 123 . The descending section smoke exhaust cylinder 123 is connected to the connecting flue 4.

In this embodiment, the transition section cooling flue includes: a first-stage cooling flue 125 and a second-stage cooling flue 126 arranged in mirror symmetry. The first-stage cooling flue 125 and the second-stage cooling flue 126 are arranged in mirror symmetry for the purpose of : Easy to install and maintain, reducing manufacturing and production costs. The cooling flue 125 of the first turning section goes upward from the top of the cooling flue 121 of the ascending section and bends in the direction of the cooling flue 122 of the descending section. The cooling flue 126 of the second section of the turning starts from the top of the cooling flue 122 of the descending section and bends upward towards the cooling section of the ascending section. The direction of the flue 121 is curved, and the first cooling flue 125 and the second cooling flue 126 are connected at the top. Two smoke explosion-proof valves 127 are provided at the top of the transition section cooling flue. The two smoke explosion-proof valves 127 are respectively located on the cooling flue 125 of the first turning section and the cooling flue 126 of the second turning section.

The cooling medium is introduced into the connecting flue 4 to cool the flue gas entering the connecting flue 4 to 600°C to 700°C. At this temperature, the particles in the high-temperature flue gas can be completely cooled, that is, the particles are no longer molten from the core to the outer surface. In this embodiment, the cooling medium in the connecting flue 4 is sprayed by nozzles 41. The nozzles 41 are arranged on the top, bottom and inner walls of the connecting flue on both sides of the connecting flue 4. The top of the connecting flue 4 is The nozzles 41 on the inner wall of the connecting flue 4 at the bottom and both sides are spaced along the length direction of the connecting flue 4. The cooling medium needs to ensure that the introduction of the cooling medium will not cause explosion, combustion or other safety issues in the connecting flue 4 .

The outlet of the connecting flue 4 is connected to a separator 5 for separating solid particles in the gas. A separator ash hopper 51 is provided at the bottom of the separator 5 . The separator 5 adopts a high temperature cyclone separator. The high-temperature cyclone separator can effectively remove particles and prevent them from scouring and abrading the waste heat recovery system.

The flue gas outlet of the separator 5 is connected to the steam superheater 6, and the superheater flue gas outlet of the steam superheater 6 is connected to the fire tube boiler 7. A boiler rising pipe 711 is provided between the fire tube boiler 7 and the fire tube boiler drum 71. and the boiler downcomer 712. The fire tube boiler 7 is connected to the fire tube economizer 9 through the transition section smoke chamber 8. The bottom of the fire tube economizer 9 is provided with a flue gas discharge cylinder 91 with a flue gas discharge port 911, and the bottom of the flue gas discharge cylinder 91 is provided with a discharge cylinder ash hopper 912. In this embodiment, both the fire tube boiler 7 and the fire tube economizer 9 adopt a vertical structure. The fire tube economizer 9 is provided with an economizer water inlet pipe 92 and an economizer water outlet pipe 93. The economizer water outlet pipe 93 is connected to the fire tube boiler water supply pipe 713 and the flue drum water supply pipe 201. The fire tube boiler water supply pipe 713 is connected to the fire tube boiler steam drum 71 , and the flue steam drum water supply pipe 201 is connected to the flue steam drum 2 . The flue drum steam output pipe 23 is provided on the flue drum 2, and the saturated steam output pipe 714 is provided on the fire tube boiler drum 71. In this embodiment, the flue drum steam output pipe 23 and the saturated steam output pipe 714 are collectively connected to the superheater steam input end 61 of the steam superheater 6 , and a superheated steam output pipe 62 is provided on the steam superheater 6 . The cooling medium is cooling water, or the flue gas output from the flue gas discharge port 911 of the flue gas discharge cylinder 91 is used as the cooling medium after being purified by desulfurization and dust removal, and the flue gas discharged from the flue gas discharge port 911 is used as the cooling medium. The cooling medium can effectively reduce the cost of waste heat recovery.

Working principle: Flue range: The high-temperature flue gas generated by the reactor 3 enters the cooling flue 1 through the entrance section cooling flue 11. Since the entrance section cooling flue 11 is tilted, the inclination angle θ is greater than or equal to 45 degrees and less than or equal to 60 Therefore, the molten slag in the cooling flue 11 at the entrance section can flow back to the reaction furnace 3 very well. That is to say, the amount of molten ash entering the waste heat recovery system is greatly reduced at the entrance of the waste heat recovery system, thereby effectively reducing the risk of slagging in the waste heat recovery system.

The high-temperature flue gas enters the roundabout section cooling flue 12 through the inlet section cooling flue 11. The high-temperature flue gas passes through the ascending section cooling flue 121, the first turning cooling flue 125, and the second turning section cooling in the roundabout section cooling flue 12. The flue 126 and the descending section cooling flue 122 continuously release heat and then cool to 750°C to 1000°C, and then enter the descending section smoke exhaust barrel 123. The ash in the descending section smoke exhaust cylinder 123 is discharged from the cooling flue ash outlet 124. The high-temperature flue gas in the descending section smoke exhaust cylinder 123 enters the connecting flue 4.

The nozzle 41 in the connection flue 4 sprays cooling medium to further cool the high-temperature flue gas. The cooling medium is cooling water or the flue gas output from the flue gas discharge port 911 of the flue gas discharge cylinder 91. Both of them can be used to cool down the high-temperature flue gas. High temperature flue gas is effectively cooled. Another advantage of using the exhaust gas output from the flue gas outlet 911 of the flue gas exhaust cylinder 91 for cooling is that it utilizes the exhaust gas and reduces the cost of waste heat recovery. The high-temperature flue gas is further cooled to 600°C to 700°C in the connecting flue 4. At this temperature, the ash remaining in the high-temperature flue gas is further cooled until its core is no longer molten.

The high-temperature flue gas further cooled in the connecting flue 4 enters the separator 5 for solid particle separation. The separator 5 separates the larger particle size particles from the high-temperature flue gas. Since the high-temperature flue gas is cooled for a second time in the connecting flue 4, the particles that still remain in the high-temperature flue gas after separation by the separator 5 are Since the core temperature of the particles has been further reduced, the particles are no longer molten from the outside to the core, which greatly reduces the possibility of the particles forming slagging in the waste heat recovery system.

The high-temperature flue gas separated by the separator 5 enters the steam superheater 6 through the flue gas outlet of the separator 5. The steam superheater 6 adopts a serpentine heat exchange tube. Although the serpentine heat exchange tube bundle in the steam superheater 6 is densely packed, the particulate matter in the high-temperature flue gas output from the separator 5 has been completely cooled to the core and is no longer molten, that is, the particulate matter has been fully cooled. Such high-temperature flue gas enters The steam superheater 6 with a dense heat exchange tube bundle will not produce slagging on the heat exchange tube bundle of the steam superheater 6. This is the key to using the steam superheater 6 in this waste heat recovery system. The use of the steam superheater 6 is effective The heat recovery efficiency of the entire waste heat recovery system is improved, and the temperature of the flue gas discharged from the flue gas outlet 911 is greatly reduced. The flue gas output by the steam superheater 6 enters the fire tube boiler 7, and the flue gas further releases heat in the fire tube boiler 7. The flue gas output by the fire tube boiler 7 enters the fire tube economizer 9 through the transition section smoke chamber 8. The flue gas after releasing heat in the tube economizer 9 is discharged outward from the flue gas discharge port 911 on the flue gas discharge cylinder 91. A part of the flue gas discharged from the flue gas discharge port 911 can be used as a cooling medium in the connecting flue 4 . The ash in the flue gas discharge cylinder 91 is discharged from the discharge cylinder ash hopper 912 .

Water process: The external water supply enters the fire tube economizer 9 through the fire tube economizer water inlet pipe 92, and the water that has absorbed heat in the fire tube economizer 9 enters through the economizer outlet pipe 93 and the fire tube boiler water supply pipe 713. It reaches the fire tube boiler drum 71 and enters the flue drum 2 through the economizer outlet pipe 93 and the flue drum water supply pipe 201. The hot water in the fire tube boiler drum 71 enters the fire tube boiler 7 through the boiler downcomer 712. The steam-water mixture formed after absorbing the heat of the flue gas in the fire tube boiler 7 enters the fire tube boiler drum 71 through the boiler riser tube 711. , the saturated steam generated by the fire tube boiler drum 71 is output from the saturated steam output pipe 714.

The hot water in the flue drum 2 enters the membrane water-cooling wall of the cooling flue 1 through the downcomer 22 of the flue water-cooling wall. The hot water in the membrane water-cooling wall absorbs the heat of the high-temperature flue gas and forms steam through the flue gas. The water-cooled wall rising pipe 21 enters the flue drum 2, and the saturated steam generated by the flue drum 2 is output through the flue drum steam output pipe 23.

The saturated steam output by the flue drum steam output pipe 23 and the saturated steam output by the fire tube boiler drum 71 through the saturated steam output pipe 714 converge and enter the steam superheater 6. The saturated steam absorbs high-temperature smoke in the steam superheater 6. The heat of the gas is then formed into superheated saturated steam that can be used to generate electricity, and is output through the hot steam output pipe 62.

The advantages of the present invention are: 1. The inlet section cooling flue 11 is gradually tilted upward from one end of the reaction furnace 3, and the angle between the inlet section cooling flue 11 and the horizontal direction is greater than or equal to 45 degrees and less than or equal to 60 degrees, so that The molten slag in the high-temperature flue gas is allowed to flow back into the reaction furnace 3 along the inlet section cooling flue, thereby effectively reducing the amount of molten particulate matter in the high-temperature flue gas at the source of the waste heat recovery system, and thus effectively avoiding slagging on the waste heat recovery system equipment. The phenomenon. 2. Control the temperature of the high-temperature flue gas output from the cooling flue at 750°C to 1000°C, and spray cooling medium into the connecting flue 4 to further cool the high-temperature flue gas to 600°C to 700°C, which makes the high-temperature flue gas The particulate matter in the flue gas is completely cooled, that is, the core of the particulate matter in the high-temperature flue gas is no longer molten. This can prevent the particles from adhering to the wall of the heat exchange tube after the high-temperature flue gas enters the heat exchange equipment and causing formation of condensation. slag phenomenon, thereby effectively improving the heat exchange effect and extending the service life of the waste heat recovery system. 3. Based on the first two points, the waste heat recovery system uses a steam superheater. The setting of the steam superheater greatly improves the heat recovery efficiency and reduces the temperature of the outlet flue gas, that is, the temperature of the flue gas discharged from the final flue gas outlet 911 is effectively After the temperature is lowered, the flue gas can be directly purified by dry dust removal, such as direct bag dust removal, which effectively saves the cost of exhaust gas purification. 4. Fire tube boilers and fire tube economizers are both vertical structures, adopt longitudinal flushing, and have good self-cleaning effect, which can effectively improve the heat exchange effect of heat exchange equipment and extend the service life of the equipment.

Claims

The waste heat recovery system supporting the Hesmet smelting reduction ironmaking system includes: a cooling flue with a membrane water-cooled wall structure, a flue water-cooled wall rising pipe connected to the flue water-cooled wall descending pipe of the membrane water-cooled cooling wall To the flue steam drum, the outlet end of the cooling flue is provided with a connecting flue, and the outlet of the connecting flue is connected to a separator for separating solid particles in the gas. It is characterized in that: the cooling flue includes an inlet section cooling flue, The cooling flue in the entrance section is connected to the reactor. The cooling flue in the entrance section is gradually tilted upward from the reactor. The angle between the cooling flue in the entrance section and the horizontal direction is greater than or equal to 45 degrees and less than or equal to 60 degrees. The high temperature in the cooling flue in the entrance section is The molten slag in the flue gas can flow back to the reaction furnace along the inlet cooling flue. The temperature of the flue gas at the outlet end of the cooling flue is controlled at 750°C ~ 1000°C. The cooling medium is introduced into the connecting flue to make it enter the connection. The flue gas in the flue is cooled to 600℃~700℃; the flue gas outlet of the separator is connected to the steam superheater, the superheater flue gas outlet of the steam superheater is connected to the fire tube boiler, and the boiler riser of the fire tube boiler is connected to the boiler The downcomer is connected to the boiler drum, and the fire tube boiler is connected to the fire tube economizer through the transition section smoke chamber. The bottom of the fire tube economizer is equipped with a flue gas discharge cylinder with a flue gas outlet. The fire tube economizer There is an economizer water inlet pipe and an economizer water outlet pipe. The economizer outlet pipe is connected to the fire tube boiler steam drum water supply pipe and the flue steam drum water supply pipe. The fire tube boiler steam drum water supply pipe is connected to the fire tube boiler steam drum water supply pipe. package, the flue drum water supply pipe is connected to the flue drum, the flue drum steam output pipe is provided on the flue drum, the fire tube boiler drum is provided with a saturated steam output pipe, the flue drum steam output pipe, The saturated steam output pipes are collectively connected to the superheater steam input end of the steam superheater, and a superheated steam output pipe is provided on the steam superheater.
The waste heat recovery system matched to the Hesmet smelting reduction ironmaking system according to claim 1, characterized in that: the cooling medium adopts cooling water, or is output from the flue gas outlet of the flue gas discharge cylinder. The flue gas is used as cooling medium after desulfurization and dust removal.
The waste heat recovery system matched to the Hesmet smelting reduction ironmaking system according to claim 2, characterized in that: the cooling medium in the connecting flue is injected through nozzles, and the nozzles are arranged at the top, bottom and bottom of the connecting flue. The nozzles on the inner walls of the connecting flue on both sides, the top and bottom of the connecting flue, and the inner walls of the connecting flue on both sides are spaced apart along the length of the connecting flue.
The waste heat recovery system matched to the Hesmet smelting reduction ironmaking system according to claim 2 or 3, characterized in that: the cooling flue further includes a roundabout section cooling section flue, and the roundabout section cooling flue The duct includes an ascending section cooling flue and a descending section cooling flue arranged vertically and parallelly. The upper ends of the ascending section cooling flue and the descending section cooling flue are connected by the transition section cooling flue. The lower end of the ascending section cooling flue It is connected with the upper end of the inlet section cooling flue. The bottom of the descending section cooling flue is connected to the descending section smoke exhaust barrel. The cooling flue ash outlet is set on the bottom of the descending section smoke exhaust barrel to connect the flue and the descending section smoke exhaust barrel. connect.
The waste heat recovery system supporting the Hesmet smelting reduction ironmaking system according to claim 4, characterized in that: the transition section cooling flue includes: a first-stage turning cooling flue and a second-stage turning cooling flue arranged in mirror images. One section of the cooling flue starts from the top of the ascending cooling flue and bends toward the direction of the descending cooling flue. The second cooling flue curves upward from the top of the descending cooling flue toward the ascending cooling flue. It turns. One section of the cooling flue is connected to the second section of the cooling flue at the top.
The waste heat recovery system matched to the Hesmet smelting reduction ironmaking system according to claim 5, characterized in that: two flue gas explosion-proof valves are provided at the top of the transition section cooling flue, and the two flue gas explosion-proof valves are respectively located at On the first section of the cooling flue and the second section of the cooling flue.
The waste heat recovery system matched to the Hesmet smelting reduction ironmaking system according to claim 1, characterized in that: the heating tube in the steam superheater adopts a serpentine heating tube.
The waste heat recovery system matched to the Hesmet smelting reduction ironmaking system according to claim 1, characterized in that: both the fire tube boiler and the fire tube economizer are vertical structures.