CN115029163A

CN115029163A - Blast furnace gas sulfur recovery device and system

Info

Publication number: CN115029163A
Application number: CN202210673283.0A
Authority: CN
Inventors: 刘时球; 陈建中; 陈璐; 张少华; 周雪鹿
Original assignee: China Ryukyu Technology Co ltd
Current assignee: China Ryukyu Environmental Protection Technology Co ltd
Priority date: 2022-06-14
Filing date: 2022-06-14
Publication date: 2022-09-09
Anticipated expiration: 2042-06-14
Also published as: CN115029163B

Abstract

The invention relates to a blast furnace gas sulfur recovery device, which comprises a washing tower, a spraying device and a conveying pipeline, wherein the washing tower is arranged on the top of the washing tower; the washing tower is provided with an inner cavity, a cylindrical spacer is arranged in the inner cavity, and the inner cavity is divided into a first cavity and a second cavity by the cylindrical spacer; the spraying device is sleeved on the periphery of the cylindrical spacer and is used for spraying the gas introduced into the inner cavity; and the conveying pipeline is arranged at the bottom of the inner cavity, one end of the conveying pipeline is communicated with the first cavity and the second cavity, and the other end of the conveying pipeline extends downwards into the precipitation tank. Through setting up scrubbing tower and spray set, in letting in the blast furnace gas that contains gaseous state sulfur simple substance into the scrubbing tower, fully spray blast furnace gas through spray set, utilize the difference in temperature to make gaseous state sulfur simple substance condense into the dust and wrap under the clamp at steam, fall into the precipitation tank in. Because the elemental sulfur is insoluble in water, precipitation is generated in the precipitation tank, and thus the elemental sulfur is recovered.

Description

Blast furnace gas sulfur recovery device and system

Technical Field

The application relates to the field of blast furnace gas desulfurization, in particular to a blast furnace gas sulfur recovery device and a system.

Background

The blast furnace gas is a sulfur-containing fuel, and the gas contains about 100-300mg/m ³ Organic sulfur and inorganic sulfur. Sulfur dioxide generated after combustion pollutes the environment. Currently, there are various gas source desulfurization technologies on the market, and gas desulfurization schemes can be divided into dry desulfurization and wet desulfurization according to the state of a desulfurizing agent.

In the prior art, for the desulfurization of sulfur-containing substances in blast furnace gas, a wet method is to wash with water through an alkaline solution, and sulfide generated by the reaction of the sulfur-containing substances and the alkaline solution remains in desulfurization waste liquid to cause secondary pollution. In the dry desulfurization process, sulfides are concentrated in an adsorption mode and then regenerated and sent to sintering treatment. Or fixing sulfur element in the adsorbent through chemical reaction of metal oxide/active carbon, and finally sending to sintering to be used as sintering raw material. These desulfurization processes not only result in the transfer of sulfur elements, but also result in the waste of sulfur resources.

Disclosure of Invention

In view of the above problems, the present application provides a sulfur recovery device, which solves the problems of sulfur resource waste and incapability of systematic recovery and utilization after the desulfurization of blast furnace gas.

In order to achieve the purpose, the application provides a blast furnace gas sulfur recovery device, which comprises a washing tower, a spraying device and a conveying pipeline; the washing tower is provided with an inner cavity, a cylindrical spacer is arranged in the inner cavity, and the inner cavity is divided into a first cavity and a second cavity by the cylindrical spacer; the washing tower is also provided with a first air inlet and a first air outlet, the first chamber is communicated with the first air inlet, and the second chamber is communicated with the first air outlet; the side, far away from the first air inlet, of the cylindrical partition is provided with a first opening, and the first chamber is communicated with the second chamber through the first opening;

the spraying device is sleeved on the periphery of the cylindrical spacer and is used for spraying the gas introduced into the inner cavity; pipeline sets up in the bottom of inner chamber, and pipeline's one end all communicates with first cavity, second cavity, and the other end downwardly extending is to the precipitation tank in.

In some embodiments, the bottom of the cylindrical partition has a first sloped portion, the bottom of the interior cavity of the scrub column has a second sloped portion, the first sloped portion and the second sloped portion are clearance fit; the gap between the two parts is narrowed down in steps along the inclined direction of the inclined part and is communicated with the conveying pipeline.

In other embodiments, the spraying device comprises a spraying channel and a first spray head, wherein the spraying channel is spirally sleeved on the periphery of the cylindrical spacer; the number of the first spray heads is multiple, and the first spray heads are arranged at intervals along the arrangement direction of the spray channel.

In some embodiments, the spraying device comprises a spraying grid and a second spray head, the spraying grid is annularly sleeved on the periphery of the cylindrical partition, the shape of the spraying grid is matched with the shape of the radial section of the first chamber, and a plurality of gas through holes are formed in the spraying grid; the quantity of second shower nozzle is a plurality of, and the interval sets up on spraying the grid, and the spout of second shower nozzle is down.

In some embodiments, the sulfur recovery device further comprises a precipitation tank, wherein the precipitation tank is provided with a liquid outlet and a sewage draining exit, and the height of the liquid outlet is higher than that of the sewage draining exit; the liquid outlet is communicated with the spray head through a water inlet pipeline, and a circulating pump is also arranged on the water inlet pipeline; a sewage discharge pipeline is also arranged in the precipitation tank, one end of the sewage discharge pipeline extends to the bottom of the precipitation tank, and the other end of the sewage discharge pipeline extends out of the sewage discharge outlet and is communicated with a sewage discharge pump.

In order to achieve the above purpose, the present application further provides a blast furnace gas sulfur recovery system, which is sequentially provided with a gas dehumidifier, a gas heater, a hydrolysis device, a catalytic device and a sulfur recovery device along a gas conducting direction, wherein the gas dehumidifier is used for cooling and dehumidifying the introduced blast furnace gas; the gas heater is used for heating the blast furnace gas subjected to temperature reduction and dehumidification by the gas dehumidifier; the hydrolysis device is used for carrying out chemical combination reaction on the sulfur-containing compounds in the blast furnace gas subjected to temperature rise treatment by the gas temperature rising device; the catalytic device is used for catalyzing the sulfur-containing compound subjected to the chemical combination reaction by the hydrolysis device to obtain a sulfur-containing elemental material; the sulfur recovery device is the blast furnace gas sulfur recovery device described above and is used for recovering elemental sulfur-containing materials.

In some embodiments, the blast furnace gas sulfur recovery system further comprises a desorption device comprising a first conduit, a second conduit, and a desorber; the first pipeline is provided with a first delivery pump, and the second pipeline is provided with a second delivery pump; the hydrolysis device comprises a first feeding hole and a first discharging hole, the desorber is communicated with the first feeding hole through a first pipeline, and the desorber is also communicated with the first discharging hole through a second pipeline;

and/or the catalytic device comprises a second feeding hole and a second discharging hole, the desorber is communicated with the second feeding hole through the first pipeline, and the desorber is also communicated with the second discharging hole through the second pipeline.

In some embodiments, the desorber has a desorption chamber therein, and the desorption chamber has a heating tube disposed therein, the heating tube having a helical shape.

In other embodiments, when the desorber is communicated with the first feed inlet through the first pipeline and communicated with the first discharge outlet through the second pipeline, the desorber further comprises a first transition bin and a first gas locker, the first transition bin is arranged on the first pipeline, and the first transition bin is communicated with the first feed inlet through the first gas locker;

and/or a second transition bin and a second air lock, wherein the second transition bin is arranged on a second pipeline and is communicated with the first discharge hole through the second air lock;

when the desorber is communicated with the second feed inlet through the first pipeline and is also communicated with the second discharge outlet through the second pipeline, the desorption device further comprises a third transition bin and a third air lock, wherein the third transition bin is arranged on the first pipeline and is communicated with the second feed inlet through the third air lock;

and/or, a fourth transition bin and a fourth air lock, wherein the fourth transition bin is arranged on the second pipeline, and the fourth transition bin is communicated with the second discharge hole through the fourth air lock.

In some embodiments, the blast furnace gas sulfur recovery system further comprises a first heat exchanger and a second heat exchanger, wherein the first heat exchanger is arranged between the gas dehumidifier and the gas heater and is used for heating the blast furnace gas cooled and dehumidified by the gas dehumidifier and introducing the heated blast furnace gas into the gas heater; the second heat exchanger is arranged between the catalytic device and the sulfur recovery device and is used for cooling the blast furnace gas treated by the catalytic device and introducing the cooled blast furnace gas into the sulfur recovery device; the first heat exchanger is connected with the second heat exchanger through a heat exchange pipeline.

Be different from prior art, above-mentioned technical scheme is through setting up scrubbing tower and spray set, and in letting in the blast furnace gas that contains gaseous state sulfur simple substance into the scrubbing tower, fully spray blast furnace gas through spray set, when giving the blast furnace gas cooling, utilize the difference in temperature to make gaseous state sulfur simple substance condense into the dust and under the parcel of steam is held, fall into the precipitation tank. Because the elemental sulfur is insoluble in water and precipitates in the precipitation tank, the elemental sulfur is recovered, and the recovered elemental sulfur can be conveyed to external equipment through a pipeline for further purification and reutilization, so that the utilization rate of the elemental sulfur is improved.

The above description of the present invention is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clearly understood by those skilled in the art, the present invention may be further implemented according to the content described in the text and drawings of the present application, and in order to make the above objects, other objects, features, and advantages of the present application more easily understood, the following description is made in conjunction with the detailed description of the present application and the drawings.

Drawings

The drawings are only for purposes of illustrating the principles, implementations, applications, features, and effects of particular embodiments of the present application, as well as others related thereto, and are not to be construed as limiting the application.

In the drawings of the specification:

FIG. 1 is a schematic diagram of a sulfur recovery unit according to an embodiment;

FIG. 2 is another schematic view of a sulfur recovery unit according to an embodiment;

FIG. 3 is a schematic diagram of a sulfur recovery system according to an embodiment;

FIG. 4 is a schematic view of a desorption apparatus according to an embodiment;

fig. 5 is a schematic diagram of the first heat exchanger and the second heat exchanger according to the embodiment.

The reference numerals referred to in the above figures are explained below:

1. a sulfur recovery unit;

11. a washing tower;

111. a first chamber;

112. a second chamber;

113. a cylindrical spacer;

114. a first air inlet;

115. a first air outlet;

116. a second inclined portion;

117. a first inclined portion;

118. a first opening;

12. a spraying device;

121. a first spray passage;

122. a first nozzle;

123. spraying a grid;

124. a second nozzle;

125. a second spray channel;

126. a third spray channel; 13. a delivery conduit;

14. a settling tank;

141. a liquid outlet;

142. a water inlet pipeline;

143. a circulation pump;

144. a blowdown line;

145. a sewage pump;

2. a gas dehumidifier;

21. a primary cooler;

22. a demister;

3. a gas temperature rising device;

4. a hydrolysis device;

41. a first feed port;

42. a first discharge port;

5. a catalytic device;

51. a second feed port;

52. a second discharge port;

6. a desorption device;

61. a first pipeline;

611. a first delivery pump;

62. a second pipeline;

621. a second delivery pump;

63. a desorber;

631. heating a tube;

64. a first transition bin;

65. a first airlock;

66. a second transition bin;

67. a second airlock;

7. a first heat exchanger;

71. a first air regulating valve;

8. a second heat exchanger;

81. a heat exchange conduit;

9. a secondary cooler;

91. and a second air regulating valve.

Detailed Description

In order to explain in detail possible application scenarios, technical principles, practical embodiments, and the like of the present application, the following detailed description is given with reference to the accompanying drawings in conjunction with the listed embodiments. The embodiments described herein are only used for clearly illustrating the technical solutions of the present application, and therefore are only used as examples, and the scope of the present application is not limited thereby.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or related to other embodiments specifically defined. In principle, in the present application, the technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution as long as there is no technical contradiction or conflict.

Unless defined otherwise, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the use of relational terms herein is intended only to describe particular embodiments and is not intended to limit the present application.

In the description of the present application, the term "and/or" is a expression for describing a logical relationship between objects, indicating that three relationships may exist, for example, a and/or B, indicating that: there are three cases of A, B, and both A and B. In addition, the character "/" herein generally indicates that the former and latter associated objects are in a logical relationship of "or".

In this application, terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation without necessarily requiring or implying any actual such relationship or order between such entities or operations.

Without further limitation, in this application, the use of the phrases "comprising," "including," "having," or other similar expressions, is intended to cover a non-exclusive inclusion, and these expressions do not exclude the presence of additional elements in a process, method, or article that includes the elements, such that a process, method, or article that includes a list of elements may include not only those elements defined, but other elements not expressly listed, or may include other elements inherent to such process, method, or article.

As is understood in the examination of the guidelines, the terms "greater than", "less than", "more than" and the like in this application are to be understood as excluding the number; the expressions "above", "below", "within" and the like are understood to include the present numbers. In addition, in the description of the embodiments of the present application, "a plurality" means two or more (including two), and expressions related to "a plurality" similar thereto are also understood, for example, "a plurality of groups", "a plurality of times", and the like, unless specifically defined otherwise.

In the description of the embodiments of the present application, spatially relative expressions such as "central," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used, and the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the specific embodiments or drawings and are only for convenience of describing the specific embodiments of the present application or for the convenience of the reader, and do not indicate or imply that the device or component in question must have a specific position, a specific orientation, or be constructed or operated in a specific orientation and therefore should not be construed as limiting the embodiments of the present application.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," and "disposed" used in the description of the embodiments of the present application should be construed broadly. For example, the connection can be a fixed connection, a detachable connection, or an integrated arrangement; it can be a mechanical connection, an electrical connection, or a communication connection; they may be directly connected or indirectly connected through an intermediate; which may be communication within two elements or an interaction of two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application belongs according to specific situations.

Referring to fig. 1, the embodiment provides a blast furnace gas sulfur recovery device 1, which includes a washing tower 11, a spraying device 12 and a conveying pipeline 13; the washing tower 11 has an inner cavity in which a cylindrical partition 113 is arranged, the cylindrical partition 113 dividing the inner cavity into a first chamber 111 and a second chamber 112; the washing tower 11 is further provided with a first air inlet 114 and a first air outlet 115, the first chamber 111 is communicated with the first air inlet 114, and the second chamber 112 is communicated with the first air outlet 115; the cylindrical partition 113 is provided with a first opening 118 on a side away from the first inlet port 114, and the first chamber 111 and the second chamber 112 communicate through the first opening 118; the spraying device 12 is sleeved on the periphery of the cylindrical partition 113 and is used for spraying the blast furnace gas introduced into the inner cavity; and the conveying pipeline 13 is arranged at the bottom of the inner cavity, one end of the conveying pipeline 13 is communicated with the first cavity 111 and the second cavity 112, and the other end of the conveying pipeline extends downwards into the settling tank 14.

The scrubber tower 11 has an inner chamber for containing blast furnace gas, and the scrubber tower 11 is preferably cylindrical. A cylindrical partition 113 is provided inside the inner cavity of the washing tower 11, and the cylindrical partition 113 may be, as shown in fig. 1, such that when the washing tower 11 is cylindrical, the cylindrical partition 113 is also cylindrical, and the cylindrical partition 113 divides the inner cavity into a first chamber 111 having a circular pipe shape, and a second chamber 112 having a cylindrical shape. The sidewall of the scrubber 11 is provided with a first inlet 114, and optionally, the first inlet 114 is provided at an upper portion of the sidewall of the scrubber 11 and is communicated with the first chamber 111. A first air outlet 115 is provided at an upper portion of the washing tower 11, and the first air outlet 115 communicates with the second chamber 112. The cylindrical partition 113 has a first opening 118 opened at a side away from the first inlet port 114, and the first chamber 111 communicates with the second chamber 112 through the first opening 118. The spraying device 12 is disposed at the periphery of the cylindrical partition 113, and specifically, the spraying device 12 is disposed in the first chamber 111 to spray the blast furnace gas entering the first chamber 111. By disposing the first opening 118 at a portion far from the first gas inlet 114, the residence time of the blast furnace gas in the first chamber 111 can be extended, thereby improving the spraying efficiency of the spraying device 12. The spraying device 12 is preferably arranged above the first gas inlet 114, so that the spraying area of the spraying device and the blast furnace gas is increased, and the contact efficiency of elemental sulfur in the blast furnace gas and water vapor is improved. One end of the delivery pipe 13 is communicated with both the first chamber 111 and the second chamber 112, and the delivery pipe 13 is preferably arranged at the bottom of the first chamber 111 and the second chamber 112, and is used for delivering the sprayed water and elemental sulfur mixed liquid to the precipitation tank 14.

The operating principle of the sulfur recovery device 1 is as follows: the blast furnace gas has a certain gas pressure during transportation, and when the blast furnace gas is introduced into the washing tower 11, the blast furnace gas has a certain flow velocity, and the flow velocity can drive the blast furnace gas to generate rotational flow in the washing tower 11, so that the blast furnace gas can rotate in the first chamber 111 spontaneously. And then, by utilizing the characteristic that the elemental sulfur dust cannot be dissolved in water, the blast furnace gas with the elemental sulfur is introduced into a washing tower 11, the blast furnace gas is further cooled by a spraying device 12, so that the elemental sulfur is desublimated into dust, the elemental sulfur dust falls to the bottom of an inner cavity of the washing tower 11 under the action of centrifugal force generated by rotational flow of the blast furnace gas under the wrapping of water vapor, water vapor and other gravity, the mixed liquid containing the elemental sulfur is conveyed into a precipitation tank 14 through a conveying pipeline 13, the elemental sulfur precipitates at the bottom of the precipitation tank 14 after the mixed liquid is static, and is insoluble in water, so that the elemental sulfur is collected. And then the elemental sulfur dust is transferred to other external equipment for further purification and other work in other modes, such as adding a discharge port at the bottom of the precipitation tank 14.

In some preferred embodiments, the first gas outlet 115 extends to a certain distance in the second chamber 112 through a pipeline, so as to increase the swirling time of the blast furnace gas in the second chamber 112, and prolong the falling time of the elemental sulfur in the blast furnace gas under the entrainment of water vapor, thereby improving the elemental sulfur separation efficiency of the blast furnace gas.

In other alternative embodiments, the inner walls of the first chamber 111 and the second chamber 112 may be coated with a waterproof coating with a smooth surface, which facilitates the water vapor to flow along the inner walls to the bottom, and at the same time, the corrosion rate of the washing tower 11 by the water vapor can be reduced, and the service life of the washing tower 11 can be prolonged.

In other embodiments, the number of the delivery pipes 13 is plural. For example, the delivery duct 13 may include a first delivery duct (not shown in the figure) communicating with the first chamber 111, and a second delivery duct, the other end of which extends into the settling tank 14; a second delivery conduit communicates with the second chamber 112, the other end of which also extends into the settling tank 14. The mixed liquid in the first chamber 111 is transported by the first transport pipe and the mixed liquid in the second chamber 112 is transported by the second transport pipe.

By providing the first and

second chambers

111, 112 in the scrubber tower 11 and by arranging the first opening 118 on the side remote from the first gas inlet 114, the residence time of the blast furnace gas in the first chamber 111 is increased. The spraying device 12 mainly sprays the blast furnace gas in the first chamber 111, and the extension of the retention time of the blast furnace gas in the first chamber 111 is helpful for improving the contact efficiency of elemental sulfur in the blast furnace gas and water vapor, and further improving the separation efficiency of the elemental sulfur and the blast furnace gas. The second chamber 112 serves as the last chamber before the blast furnace gas is discharged outside, and plays a role of a buffer chamber, collects the mixed liquid of the residual elemental sulfur and water vapor in the blast furnace gas, converges at the bottom of the second chamber 112 under the action of gravity, and conveys the mixed liquid to the precipitation tank 14 along with the conveying pipeline 13, so that the elemental sulfur collection is realized, and the content of the elemental sulfur in the blast furnace gas is effectively reduced.

In some embodiments, the bottom of the cylindrical partition 113 has a first sloped portion 117, the bottom of the interior cavity of the scrub column 11 has a second sloped portion 116, and the first sloped portion 117 and the second sloped portion 116 are clearance fit; the gap between the two parts is narrowed down in steps along the inclined direction of the inclined part and is communicated with the conveying pipeline.

Referring to fig. 1, the direction indicated by the dotted arrow in the figure indicates the flow direction of the blast furnace gas, the bottom of the cylindrical separator 113 has a first inclined portion 117, specifically, the first inclined portion 117 is inclined inward, and when the cylindrical separator 113 has a cylindrical shape, the first inclined portion 117 has a conical shape, and a port hole communicating with the transfer duct 13 is left in the conical bottom. The second inclined portion 116 is disposed at the bottom of the inner cavity of the washing tower 11, specifically, the second inclined portion 116 is inclined inward, and when the washing tower 11 is cylindrical, the second inclined portion 116 is conical. As shown in fig. 1, a gap is left between the first inclined portion 117 and the second inclined portion 116. The gap between the first inclined part 117 and the second inclined part 116 is gradually narrowed with the inclination angle of the first inclined part 117 and the second inclined part 116 being different, but not completely closed, and there is still a gap for the mixed liquid to pass through. The end of the gap communicates with the delivery conduit so that the mixed liquid in the first chamber 111 can flow through the gap into the precipitation tank 14 via the delivery conduit and the mixed liquid in the second chamber 112 flows through the delivery conduit into the precipitation tank 14, thereby achieving delivery of the mixed liquid.

The provision of the first and second

inclined portions

117, 116 helps the mixed liquid to be collected by gravity at the bottom of the first and

second chambers

111, 112 and then directed to the settling tank 14 via the transfer pipe. Meanwhile, the situation that the sulfur in the mixed liquid is deposited and then attached to the bottom of the first chamber 111 or the bottom of the second chamber 112 to cause the deposit to agglomerate in the first chamber 111 or the second chamber 112 over time is avoided.

Referring to fig. 2, the direction indicated by the short arrows indicates the flow direction of the blast furnace gas, in other embodiments, the spraying device 12 includes a spraying channel spirally disposed on the outer periphery of the cylindrical partition 113 and a first nozzle 122; the number of the first spray heads 122 is plural, and the first spray heads are arranged at intervals along the arrangement direction of the spray channels.

In another embodiment of the sulfur recovery apparatus 1, as shown in fig. 2, the scrubber 11 has a cylindrical structure, the second chamber 112 has a cylindrical structure, and the first chamber 111 and the spray device 12 are combined to form an irregular shape. Specifically, the first chamber 111 is composed of several shower passages.

The spraying channel is spirally sleeved on the periphery of the cylindrical spacer 113, and the spiral spraying channel has a structure for gradually lifting the blast furnace gas, and specifically, the spraying channel includes a first spraying channel 121, a second spraying channel 125, and a third spraying channel 126. The first spraying channel 121 is disposed at the first gas inlet 114, and the first spraying channel 121 is an arc-shaped plate-shaped structure for guiding the blast furnace gas to move downward. The second spraying channel 125 is in a shape of a circular pipe and is sleeved outside the second chamber 112, and specifically, the second spraying channel 125 is disposed below the first spraying channel 121 and is used for guiding the blast furnace gas to circularly flow in the first chamber 111. The third spray passage 126 is disposed above the second spray passage 125, and is disposed opposite to the first spray passage 121, specifically, one end of the third spray passage 126 is inclined downward to communicate with the second spray passage 125, and the other end of the third spray passage 126 communicates with the first opening 118. The third spraying channel 126 is in a shape corresponding to the spiral shape when communicating with the second spraying channel 125, and the blast furnace gas is guided from the second spraying channel 125 to the first opening 118 and enters the second chamber 112 through the communication between the third spraying channel 126 and the second spraying channel 125.

The first spray heads 122 are arranged at the upper part of the spray channel at intervals, and the first spray heads 122 can be arranged according to actual requirements, for example, a small amount of first spray channels 121 are arranged, the first spray channels 125 are densely arranged, and the third spray channels 126 are arranged in a proper amount; the specific arrangement mode can be variable-pitch arrangement, equal-pitch arrangement and the like, and the arrangement mode is designed according to the flow rate of the blast furnace gas. The first nozzle 122 is arranged downwards, so that the blast furnace gas in the spraying channel can be fully sprayed. In other preferred embodiments, a valve may be added at the first nozzle 122, and part of the first nozzle 122 is closed when the amount of the blast furnace gas is small, so as to save the amount of the spray water and resources.

Through setting up the shower passage, the flow direction of guide blast furnace gas in first cavity 111 can improve the contact efficiency of interior elementary sulfur substance of blast furnace gas and steam to improve the efficiency of following the separation of elementary sulfur substance from blast furnace gas, promote the collection rate of elementary sulfur substance.

In some embodiments, the spraying device 12 includes a spraying grid 123 and a second nozzle 124, the spraying grid 123 is annularly sleeved on the periphery of the cylindrical partition 113, the shape of the spraying grid 123 is matched with the radial cross-sectional shape of the first chamber 111, and a plurality of blast furnace gas through holes are arranged on the spraying grid 123; the number of the second spray heads 124 is a plurality, and the second spray heads 124 are arranged on the spray grille 123 at intervals, and the nozzles of the second spray heads 124 face downwards.

Referring to fig. 1, the spray grid 123 is annularly disposed around the cylindrical spacer 113, and in some embodiments, the first chamber 111 is tubular, and the radial cross-sectional shape of the first chamber 111 is circular, so that the spray grid 123 is circular and slightly smaller than the radial cross-sectional size of the first chamber 111. The shower grid 123 is provided with a plurality of blast furnace gas through holes through which blast furnace gas can pass. A plurality of second spray heads 124 are arranged at the lower part of the spray grid 123, and the nozzles of the second spray heads 124 are arranged downwards. In some preferred embodiments, the spray grate 123 is disposed above the first gas inlet 114 such that the second spray head 124 can more fully spray the blast furnace gas into the first chamber 111.

Through setting up and spraying grid 123 and second shower nozzle 124, can make gaseous state simple substance of sulfur in the blast furnace gas fully contact with steam, improve the efficiency of separating the simple substance of sulfur from the blast furnace gas, and then promote the collection rate of simple substance of sulfur.

In some embodiments, the sulfur recovery device 1 further comprises a precipitation tank 14, wherein the precipitation tank 14 is provided with a liquid outlet 141 and a sewage draining exit, and the height of the liquid outlet 141 is higher than that of the sewage draining exit; the liquid outlet 141 is communicated with the spray head through a water inlet pipeline 142, and a circulating pump 143 is arranged on the water inlet pipeline 142; a sewage discharge pipeline 144 is also arranged in the sedimentation tank 14, one end of the sewage discharge pipeline 144 extends to the bottom of the sedimentation tank 14, and the other end of the sewage discharge pipeline 144 extends out of the sewage discharge outlet and is communicated with a sewage discharge pump 145.

Referring to fig. 1, the precipitation tank 14 is preferably cylindrically disposed at the bottom of the washing tower 11, the precipitation tank 14 is provided with a liquid outlet 141 and a sewage draining exit, the height of the liquid outlet 141 is higher than that of the sewage draining exit, so as to prevent the precipitated elemental sulfur from being transported to the spray head through the liquid outlet 141 to block the spray head. The liquid outlet 141 is communicated with the spray head through a water inlet pipeline 142, a circulating pump 143 is further arranged on the water inlet pipeline 142, water in the settling tank 14 is pumped into the spray head again through the circulating pump 143, the cyclic utilization of water resources is achieved, the frequency of supplementing water in the washing tower 11 is reduced, and the overhauling frequency is reduced.

A sewage pipeline 144 is arranged in the precipitation tank 14, and one end of the sewage pipeline 144 extends to the bottom of the precipitation tank 14, so that the sulfur elemental dust precipitated at the bottom can be conveniently sucked. The other end of the sewage pipe 144 is provided with a sewage pump 145, and the sulfur is pumped to external equipment through the sewage pump 145 for subsequent purification and other work. Through setting up sewage pipes 144 and inlet channel, realize the cyclic utilization of the water resource in spray set 12, can take out the elemental sulfur from precipitation tank 14 simultaneously, be convenient for the follow-up operations such as repurification of elemental sulfur.

Referring to fig. 3, the present application further provides a blast furnace gas sulfur recovery system, which is sequentially provided with a gas dehumidifier 2, a gas heater 3, a hydrolysis device 4, a catalytic device 5 and a sulfur recovery device 1 along a blast furnace gas conducting direction, wherein the gas dehumidifier 2 is used for cooling and dehumidifying the introduced blast furnace gas; the gas heater 3 is used for heating the blast furnace gas subjected to temperature reduction and dehumidification by the gas dehumidifier; the hydrolysis device 4 is used for carrying out chemical combination reaction on the sulfur-containing compounds in the blast furnace gas subjected to temperature rise treatment by the gas temperature rising device 3; the catalytic device 5 is used for catalyzing the sulfur-containing compound subjected to the chemical combination reaction by the hydrolysis device 4 to obtain a sulfur-containing elemental material; the sulfur recovery device 1 is the blast furnace gas sulfur recovery device 1 described above, and is used for recovering elemental sulfur-containing materials.

The gas dehumidifier 2 comprises a demister 22, a first-stage cooler 21, a second gas inlet and a second gas outlet, the second gas inlet is used for introducing blast furnace gas to be treated, the first-stage cooling pipe is arranged on one side close to the second gas inlet, and the demister 22 is arranged on one side close to the second gas outlet. The primary cooler 21 may be a finned heat exchanger or a first cooling pipe, and the first cooling pipe is spirally sleeved outside the gas dehumidifier 2. The cold source of the primary cooler 21 may be outdoor cooling water, or chilled water, etc. The blast furnace gas is cooled by the primary cooler 21, so that water vapor mixed with the blast furnace gas is condensed into water drops and falls into the gas dehumidifier 2 under the action of gravity. The demister 22 can be a wire mesh type demister 22, and the demister 22 further removes the gaseous water remaining in the blast furnace gas, thereby achieving the purpose of cooling and dehumidifying the blast furnace gas.

The working principle of the gas dehumidifier is further explained by combining the specific embodiment:

the temperature of the blast furnace gas entering the gas dehumidifier 2 is between 40 and 70 ℃, and the water content of the blast furnace gas is related to the temperature of the blast furnace gas. The higher the temperature of the blast furnace gas, the greater the amount of gaseous water contained in the blast furnace gas. Therefore, the aim of dehumidifying the coal gas is fulfilled by cooling the blast furnace coal gas. The temperature of the blast furnace gas is reduced to 30 ℃ by utilizing a primary cooler 21At this time, the amount of gaseous water contained in the blast furnace gas is about 31g/m DEG C ³ Left and right. The water content of the blast furnace gas is reduced to 35g/m by the primary cooler 21 ³ The subsequent hydrolysis reaction and the subsequent catalytic reaction are not affected. The first-stage heat exchanger is preferably a finned heat exchanger, and the cold source can be outdoor cooling water, the temperature is usually 20-35 ℃, and the chilled water can also be generated by a lithium bromide unit. The temperature of the blast furnace gas is reduced to below 30 ℃ by indirect heat exchange. The gaseous water in the blast furnace gas is condensed and separated out, part of the gaseous water is attached to the inner wall of the gas dehumidifier 2 to form water drops which fall, and the suspended water drops remained in the blast furnace gas pass through the wire mesh demister 22 at the outlet of the gas dehumidifier 2 to capture the suspended condensed water drops, and then are discharged from the bottom of the gas dehumidifier 2, so that the dehumidifying effect of the blast furnace gas is realized.

The gas heater 3 comprises a third gas inlet and a third gas outlet, and the second gas outlet is communicated with the third gas inlet and is used for guiding the blast furnace gas subjected to temperature reduction and dehumidification treatment into the gas heater 3. The gas heater 3 heats the blast furnace gas again to the temperature required by the hydrolysis reaction. The gas temperature rising device 3 can adopt an electric heating mode and can also adopt a finned tube type steam heater. In some preferred embodiments, a finned tube steam heater is used, and the steam heat source is 0.6-0.8MPa saturated steam at 160-180 ℃. In order to meet the subsequent technological requirements, the coal gas temperature raising device 3 is required to raise the temperature of the coal gas to 70-110 ℃.

The hydrolysis device 4 comprises a fourth air inlet and a fourth air outlet, the fourth air inlet is communicated with the third air outlet, and the blast furnace gas after being heated enters the hydrolysis device 4 through the fourth air inlet. In the dry desulfurization process, the hydrolysis device 4 is filled with solid material particles required by the hydrolysis reaction, the blast furnace gas passes through the hydrolysis device 4 to convert organic sulfur in the blast furnace gas into hydrogen sulfide blast furnace gas, and then flows into the catalytic device 5 through the fourth gas outlet.

The catalytic device 5 comprises a fifth gas inlet and a fifth gas outlet, the fifth gas inlet is communicated with the fourth gas outlet, a heater is arranged between the fifth gas inlet and the fourth gas inlet, the heater can be an electric heating pipe 631 and the like, and the heater further heats the blast furnace gas to 120 ℃ and 150 ℃, so that the temperature of the blast furnace gas required by the catalytic reaction is met. The catalytic device 5 is filled with a catalyst to oxidize elemental sulfur in the hydrogen sulfide into elemental sulfur. The formed gaseous sulfur is discharged with the blast furnace gas. A small amount of elemental sulfur remains on the catalyst surface as a solid powder.

The first gas inlet 114 is communicated with the fifth gas outlet, the second-stage cooler 9 is arranged between the first gas inlet 114 and the fifth gas outlet, the second-stage cooler 9 can be a fin-type heat exchanger or a second cooling pipe, the second cooling pipe can cool the blast furnace gas in a manner of being sleeved on the periphery of the pipeline or extend into the pipeline, and the temperature of the gas is reduced to about 70 ℃. The cold source of the secondary cooler 9 may be outdoor cooling water, or chilled water, etc. The blast furnace gas is cooled by a secondary cooler 9, most of sulfur steam is finally cooled into sulfur powder by utilizing the characteristic that the melting point temperature of the elemental sulfur is 119 ℃, and the sulfur powder also contains about 4mg/m ³ The elemental sulfur of (a) will be present in the form of steam. The surface of the secondary cooler 9 is attached with partial sulfur powder, the secondary cooler can be used for blowing regularly through the sound wave soot blower, a secondary cooling cavity can be additionally arranged at the position where the secondary cooler 9 is arranged and used for containing the desublimed sulfur powder, a channel is formed in the bottom of the secondary cooling cavity, and the sulfur powder is discharged periodically.

In some preferred embodiments, a second bypass is further provided on one side of the secondary cooler 9, and a second gas regulating valve 91 is provided on the bypass, and the second gas regulating valve 91 may be a gas regulating valve with an adjustable opening degree. The second gas regulating valve 91 serves to regulate the throughput of blast furnace gas in the secondary cooler 9 and thus further regulate the temperature of the blast furnace gas entering the sulfur recovery unit 1.

The residual gaseous sulfur simple substance in the blast furnace gas enters the sulfur recovery device 1 through the first air inlet 114, the sulfur recovery device 1 sprays the blast furnace gas through the washing tower 11 and the spraying device 12, 98% of sulfur steam can be removed from the blast furnace gas after spraying and washing, and finally the total sulfur content in the blast furnace gas is less than 20mg/m ³ . The blast furnace gas can be used as clean fuel, and the flue gas after combustion meets the requirements of steelThe ultra-low emission requirement of the industry.

In some embodiments, the blast furnace gas sulfur recovery system further comprises a desorption device 6, the desorption device 6 comprising a first conduit 61, a second conduit 62, and a desorber 63; the first pipeline 61 is provided with a first delivery pump 611, and the second pipeline 62 is provided with a second delivery pump 621; the hydrolysis device 4 comprises a first feeding hole 41 and a first discharging hole 42, a desorber 63 is communicated with the first feeding hole 41 through a first pipeline 61, and the desorber 63 is also communicated with the first discharging hole 42 through a second pipeline 62; and/or the catalytic device 5 comprises a second inlet 51 and a second outlet 52, the desorber 63 is communicated with the second inlet 51 through a first pipeline 61, and the desorber 63 is also communicated with the second outlet 52 through a second pipeline 62.

Referring to fig. 3, after the hydrolysis reaction or the catalytic reaction, the solid material required for the hydrolysis reaction or the solid material required for the catalytic reaction may be saturated, and at this time, the solid material needs to be desorbed. Desorption refers to the working principle of removing the adsorbed substances through the reverse process of adsorption, i.e. separating out sulfur compounds or sulfur elementary substances adsorbed in the solid materials from the solid materials in a heating mode, so that the solid materials can regain the hydrolysis or catalytic capacity.

The desorption device 6 is arranged on one side of the hydrolysis device 4 or on one side of the catalytic device 5. When the desorption device 6 is used for desorbing the solid materials in the hydrolysis device 4, the desorption device 6 is communicated with the first feed port 41 of the hydrolysis device 4 through the first pipeline 61 and is communicated with the first discharge port 42 of the hydrolysis device 4 through the second pipeline 62. The solid material in the hydrolysis device 4 is conveyed into the desorber 63 through the second conveying pump 621 of the second pipeline 62 for desorption reaction, and after the desorption reaction is finished, the solid material returns to the hydrolysis device 4 again through the first conveying pump 611 of the first pipeline 61.

When the desorption device 6 is used for desorbing solid material in the catalytic device 5, the desorption device 6 is communicated with the second feed port 51 of the catalytic device 5 through the first pipeline 61 and is communicated with the second discharge port 52 of the catalytic device 5 through the second pipeline 62. The solid material in the catalytic device 5 is transported into the desorber 63 through the second pipeline 62 for desorption reaction, and after the desorption reaction is finished, the solid material is returned to the catalytic device 5 through the first pipeline 61 again.

In other preferred embodiments, the first pipeline 61 has two first pipeline branches, one of the first pipeline branches is communicated with the first feeding hole 41, the other first pipeline branch is communicated with the second feeding hole 51, and each first pipeline branch is provided with a valve for controlling the on-off of the first pipeline branch; the second pipeline 62 is provided with two second pipeline branches, one of the second pipeline branches is communicated with the first discharge hole 42, the other second pipeline branch is communicated with the second discharge hole 52, and each second pipeline branch is provided with a valve for controlling the on-off of the second pipeline branch; only one desorption device 6 needs to be arranged, and the desorption requirement of the hydrolysis device 4 or the catalytic device 5 can be met by opening and closing the corresponding valve.

Through the desorption device 6, the solid materials in the hydrolysis device 4 or the catalytic device 5 can be repeatedly utilized, so that the replacement time of the solid materials in the hydrolysis device 4 or the catalytic device 5 is shortened, the solid materials in the hydrolysis device 4 or the catalytic device 5 can be circularly updated without stopping production, and the hydrolysis or catalytic reaction rate of blast furnace gas is improved.

Referring to fig. 4, in some embodiments, the desorber 63 has a desorption chamber therein, and a heating pipe 631 is disposed in the desorption chamber, wherein the heating pipe 631 has a spiral shape.

The desorption chamber is used for containing solid materials, a heating pipe 631 is arranged in the desorption chamber, and the heating pipe 631 is used for heating the solid materials. The solid material has weaker heat conduction capability, so the heating pipe 631 is spirally arranged and uniformly coiled inside the desorption chamber, the heating rate and the heating uniformity of the desorber 63 can be improved, and the desorption efficiency of the solid material is further improved.

In other embodiments, when the desorber 63 is in communication with the first feed port 41 through the first pipeline 61 and in communication with the first discharge port 42 through the second pipeline 62, the desorption apparatus 6 further comprises a first transition bin 64 and a first airlock 65, the first transition bin 64 is disposed on the first pipeline 61, and the first transition bin 64 is in communication with the first feed port 41 through the first airlock 65; and/or a second transition bin 66 and a second gas locker 67, wherein the second transition bin 66 is arranged on the second pipeline 62, and the second transition bin 66 is communicated with the first discharge hole 42 through the second gas locker 67.

Referring to fig. 4, when the desorber 63 is mainly used for desorbing solid materials in the hydrolysis apparatus 4, the first pipeline 61 is communicated with the first feed port 41, and the second pipeline 62 is communicated with the first discharge port 42. The first transition bin 64 is disposed on the first pipeline 61, specifically, the first transition bin 64 is disposed between the first conveying pump 611 and the first feed inlet 41, the first transition bin 64 is configured to store the desorbed solid material, the first conveying pump 611 conveys the solid material to the first transition bin 64, and the first transition bin conveys the solid material to the hydrolysis apparatus 4. The air lock is a commercially available standard product for air locking or quantitative feeding when conveying dry powdery materials, and has an air locking function. The first gas lock 65 is arranged between the first transition bin 64 and the first feed inlet 41, and the first transition bin 64 and the first gas lock 65 can prevent blast furnace gas in the hydrolysis device 4 from entering the desorption device 6 to affect desorption efficiency. In some preferred embodiments, a further first gas lock 65 is provided between the first transition bin 64 and the first transfer pump 611, which further prevents blast furnace gas from flowing from the transition bin into the desorption device 6.

A second transition bin 66 is arranged on the second pipeline 62, specifically, the second transition bin 66 is arranged between the second conveying pump 621 and the first discharge hole 42, and the second transition bin 66 is used for storing the solid materials discharged from the hydrolysis device 4. A second gas locking device 67 is arranged between the second transition bin 66 and the first discharge hole 42, and the second transition bin 66 and the second gas locking device 67 can prevent blast furnace gas in the hydrolysis device 4 from entering the desorption device 6 to influence the desorption efficiency. In some preferred embodiments, another second gas locker 67 is further provided between the second transition bin 66 and the second transfer pump 621, which can further prevent the blast furnace gas from flowing from the transition bin into the desorption device 6.

The concrete working principle of desorbing the solid materials in the hydrolysis device 4 by the desorption device 6 is as follows: and opening a second air lock 67 arranged between the first discharge hole 42 and the second transition bin 66, and closing the other second air lock 67, wherein the solid materials fall into the second transition bin 66 from the hydrolysis device 4. Then, the second gas locker 67 disposed between the first discharge port 42 and the second transition bin 66 is closed, the second gas locker 67 disposed between the second transition bin 66 and the second transfer pump 621 is opened, and the second transfer pump 621 is started to transfer the solid material to the desorber 63. After the material conveying is finished, the second air lock 67 is closed, the desorber 63 is opened, the solid material is desorbed, and after the desorption is finished, the first air lock 65 arranged between the first conveying pump 611 and the first transition bin 64 is opened, the first conveying pump 611 is opened, and the solid material is conveyed to the first transition bin 64. After the material conveying is finished, the first air lock 65 arranged between the first conveying pump 611 and the first transition bin 64 is closed, the first air lock 65 arranged between the first transition bin 64 and the first feeding hole 41 is opened, the solid material is fed into the hydrolysis device 4 again, and then the first air lock 65 is closed.

When the desorber 63 is communicated with the second feed inlet 51 through the first pipeline 61, and the desorber 63 is further communicated with the second discharge outlet 52 through the second pipeline 62, the desorption device 6 further comprises a third transition bin and a third gas locker, wherein the third transition bin is arranged on the first pipeline 61, and the third transition bin is communicated with the second feed inlet 51 through the third gas locker; and/or, a fourth transition bin and a fourth air-lock device, the fourth transition bin is arranged on the second pipeline 62, and the fourth transition bin is communicated with the second discharge hole 52 through the fourth air-lock device.

The desorber 63 is mainly used for desorbing solid materials in the catalytic device 5, and the first pipeline 61 is communicated with the second feed port 51, and the second pipeline 62 is communicated with the second discharge port 52. The third transition bin is disposed on the first pipeline 61, specifically, the third transition bin is disposed between the first delivery pump 611 and the second feed inlet 51, the third transition bin is configured to store the desorbed solid material, the first delivery pump 611 delivers the solid material to the third transition bin first, and the first transition bin delivers the solid material to the catalytic apparatus 5. And a third gas locker is arranged between the third transition bin and the second feed inlet 51, and the third transition bin and the third gas locker can prevent blast furnace gas in the catalytic device 5 from entering the desorption device 6 to influence the desorption efficiency. In some preferred embodiments, another third gas locker is further provided between the third transition bin and the first transfer pump 611, which can further prevent the blast furnace gas from flowing from the transition bin into the desorption apparatus 6.

A fourth transition bin is arranged on the second pipeline 62, specifically, between the second delivery pump 621 and the second discharge port 52, and is used for storing the solid material discharged from the catalytic device 5. A fourth gas locking device is arranged between the fourth transition bin and the second discharge hole 52, and the fourth transition bin and the fourth gas locking device can prevent blast furnace gas in the catalytic device 5 from entering the desorption device 6 to influence the desorption efficiency. In some preferred embodiments, another fourth gas locker is further disposed between the fourth transition bin and the second transfer pump 621, so as to further prevent the blast furnace gas from flowing from the transition bin into the desorption device 6.

The specific working principle of the desorption device 6 for desorbing the solid materials in the catalytic device 5 is as follows: and opening a fourth air lock arranged between the second discharge hole 52 and the fourth transition bin, and enabling the other fourth air lock to be in a closed state, wherein the solid material falls into the fourth transition bin from the catalytic device 5. Then, the fourth gas locker disposed between the second discharge port 52 and the fourth transition bin is closed, the fourth gas locker disposed between the fourth transition bin and the second transfer pump 621 is opened, the second transfer pump 621 is started, and the solid material is transferred to the desorber 63. And after the material conveying is finished, closing the fourth air lock, starting the desorber 63, desorbing the solid material, and after the desorption is finished, opening a third air lock arranged between the first conveying pump 611 and the third transition bin, starting the first conveying pump 611, and conveying the solid material to the third transition bin. After the material conveying is finished, the third air lock arranged between the first conveying pump 611 and the third transition bin is closed, the third air lock arranged between the third transition bin and the second feeding hole 51 is opened, the solid material is sent into the catalytic device 5 again, and then the third air lock is closed.

By arranging the first transition bin 64, the second transition bin 66, the third transition bin, the fourth transition bin, the first gas locker 65, the second gas locker 67, the third gas locker and the fourth gas locker, the influence on the desorption efficiency caused by the blast furnace gas in the hydrolysis device 4 or the blast furnace gas in the catalytic device 5 flowing into the desorption device 6 is avoided; meanwhile, the risk of blast furnace gas leakage is reduced.

Referring to fig. 3 and 5, in some embodiments, the blast furnace gas sulfur recovery system further includes a first heat exchanger 7 and a second heat exchanger 8, the first heat exchanger 7 is disposed between the gas dehumidifier 2 and the gas heater 3, and is used for heating the blast furnace gas cooled and dehumidified by the gas dehumidifier 2 and introducing the heated blast furnace gas into the gas heater 3; the second heat exchanger 8 is arranged between the catalytic device 5 and the sulfur recovery device 1, and is used for cooling the blast furnace gas treated by the catalytic device 5 and introducing the cooled blast furnace gas into the sulfur recovery device 1; the first heat exchanger 7 and the second heat exchanger 8 are connected by a heat exchange pipe 81.

The heat exchanger is a device for transferring part of heat of hot fluid to cold fluid, and is also called as a heat exchanger. Therefore, the heat exchanger is divided into two parts, one part is used for cooling hot fluid, and the other part is used for heating cold fluid, so that the heat exchange function of the heat exchanger can be realized. In this embodiment, the first heat exchanger 7 is used for primarily heating up blast furnace gas, and the second heat exchanger 8 is used for primarily cooling down blast furnace gas, please refer to fig. 3, the first heat exchanger 7 and the second heat exchanger 8 are connected through a heat exchange pipe 81, and heat transfer is realized by using a heat exchange medium in the heat exchange pipe 81, so as to realize the temperature rise and fall of blast furnace gas.

Specifically, the first heat exchanger 7 and the second heat exchanger 8 form a whole, and optionally, the first heat exchanger 7 and the second heat exchanger 8 are tubular gas heat exchangers. The gas heat exchanger is divided into a first heat exchanger 7 and a second heat exchanger 8 by a partition plate. The first heat exchanger 7 and the second heat exchanger 8 are arranged up and down, a plurality of rows of heat exchange pipelines 81 are arranged in the gas heat exchanger, the heat exchange pipelines 81 penetrate through the partition plate in a direction perpendicular to the airflow direction, one end of each heat exchange pipeline 81 is arranged in the first heat exchanger 7, and the other end of each heat exchange pipeline 81 is arranged in the second heat exchanger 8. The heat exchange pipe 81 is provided with a heat exchange medium, when the blast furnace gas in the high temperature section passes through the inner cavity of the second heat exchanger 8, the heat exchange medium in the heat exchange pipe 81 is heated and evaporated, and the steam flows to the upper pipe section of the heat exchange pipe 81, namely enters the inner cavity of the first heat exchanger 7. Because the upper pipe section of the heat exchange pipe 81 is affected by the blast furnace gas in the low temperature section, the heat exchange medium exchanges heat, and the heat exchange medium is condensed into liquid state and flows back to the lower pipe section along the pipe wall, namely enters the inner cavity of the second heat exchanger 8. The pressure inside the heat exchange tubes 81 increases in sequence in the flow direction of the low-temperature side blast furnace gas. Because the saturation temperature of the heat exchange medium is positively correlated with the pressure in the heat exchange pipe, the evaporation and condensation temperature in the heat exchange pipe is higher and higher along the flowing direction of the low-temperature side coal gas, and thus the step temperature heat exchange is realized.

The first heat exchanger 7 can heat the blast furnace gas from 30 ℃ to 70 ℃, the second heat exchanger 8 can cool the blast furnace gas from 120 ℃ to 150 ℃ to about 70 ℃, and the heat exchange function is realized by utilizing the temperature difference of the blast furnace gas at two sides, so that the waste heat of the blast furnace gas is utilized, the waste of the waste heat of the blast furnace gas is not caused, the energy consumption is reduced, and the energy is saved.

In some embodiments, a first bypass is further provided on one side of the first heat exchanger 7, a first gas regulating valve 71 is provided on the first bypass, and the first gas regulating valve 71 may be a gas regulating valve with an adjustable opening degree. The first gas regulating valve 71 is used for regulating the throughput of the blast furnace gas in the first heat exchange tube, thereby further regulating the throughput of the blast furnace gas in the first heat exchange tube.

A blast furnace gas sulfur recovery system has multiple functions, and can perform multiple functions such as dehumidification treatment, waste heat utilization of blast furnace gas, desulfurization of blast furnace gas, sulfur recovery and the like on blast furnace gas. When the blast furnace gas is desulfurized, the moisture content of the blast furnace gas is reduced, and the corrosion of the blast furnace gas to a gas pipe network is reduced. In addition, the gas heat exchanger can exchange and recover energy among different links of the desulfurization system, so that the operation energy consumption of a production line is greatly reduced; and the sulfur element in the blast furnace gas is finally collected in the form of elemental sulfur, so that the sulfur resource is really recycled.

Through setting up scrubbing tower 11 and spray set 12, in will containing the blast furnace gas of gaseous state sulphur simple substance lets in scrubbing tower 11, fully spray blast furnace gas through spray set 12, when giving the blast furnace gas cooling, utilize the difference in temperature to make gaseous state sulphur simple substance condense into the dust and wrap under the arm of water vapor, fall in the precipitation tank 14. Because the elemental sulfur is insoluble in water, the elemental sulfur is precipitated in the precipitation tank 14, so that the elemental sulfur is recovered, and the recovered elemental sulfur can be conveyed to external equipment through a pipeline for further purification and reuse, so that the utilization rate of the elemental sulfur is improved.

Finally, it should be noted that, although the above embodiments have been described in the text and drawings of the present application, the scope of the patent protection of the present application is not limited thereby. All technical solutions which are generated by replacing or modifying the equivalent structure or the equivalent flow according to the contents described in the text and the drawings of the present application, and which are directly or indirectly implemented in other related technical fields, are included in the scope of protection of the present application.

Claims

1. A blast furnace gas sulfur recovery apparatus, comprising:

a scrubber tower having an inner chamber with a cylindrical partition disposed therein dividing the inner chamber into a first chamber and a second chamber; the washing tower is also provided with a first air inlet and a first air outlet, the first chamber is communicated with the first air inlet, and the second chamber is communicated with the first air outlet; the cylindrical separator is provided with a first opening at one side far away from the first air inlet, and the first chamber is communicated with the second chamber through the first opening;

the spraying device is sleeved on the periphery of the cylindrical spacer and is used for spraying the gas introduced into the inner cavity;

and the conveying pipeline is arranged at the bottom of the inner cavity, one end of the conveying pipeline is communicated with the first cavity and the second cavity, and the other end of the conveying pipeline extends downwards into the precipitation tank.

2. The blast furnace gas sulfur recovery device according to claim 1, wherein the bottom of the cylindrical partition has a first inclined portion, the bottom of the inner cavity of the scrubbing tower has a second inclined portion, and the first inclined portion and the second inclined portion are in clearance fit; the gap between the two parts is narrowed down in steps along the inclined direction of the inclined part and is communicated with the conveying pipeline.

3. The blast furnace gas sulfur recovery device according to claim 1, wherein the spray device comprises:

the spraying channel is spirally sleeved on the periphery of the cylindrical spacer;

and the first spray heads are arranged at intervals along the arrangement direction of the spray channel.

4. The blast furnace gas sulfur recovery device according to claim 1, wherein the spray device comprises:

the spraying grating is annularly sleeved on the periphery of the cylindrical spacing part, the shape of the spraying grating is matched with the shape of the radial section of the first cavity, and a plurality of gas through holes are formed in the spraying grating;

and the second spray heads are arranged on the spraying grid at intervals, and the nozzles of the second spray heads face downwards.

5. The blast furnace gas sulfur recovery device according to claim 3, further comprising a settling tank, wherein the settling tank is provided with a liquid outlet and a sewage draining exit, and the height of the liquid outlet is higher than that of the sewage draining exit;

the liquid outlet is communicated with the spray head through a water inlet pipeline, and a circulating pump is further arranged on the water inlet pipeline;

and a sewage discharge pipeline is also arranged in the precipitation tank, one end of the sewage discharge pipeline extends to the bottom of the precipitation tank, and the other end of the sewage discharge pipeline extends out of the sewage discharge port and is communicated with a sewage discharge pump.

6. A blast furnace gas sulfur recovery system is sequentially provided with:

the gas dehumidifier is used for cooling and dehumidifying the introduced blast furnace gas;

the gas heating device is used for heating the blast furnace gas subjected to temperature reduction and dehumidification by the gas dehumidifier;

a hydrolysis device for performing a chemical combination reaction of sulfur-containing compounds in the blast furnace gas subjected to the temperature increase treatment by the gas temperature increasing device;

the catalytic device is used for catalyzing the sulfur-containing compound subjected to the chemical combination reaction by the hydrolysis device to obtain a sulfur-containing elemental material;

a sulfur recovery apparatus according to any one of claims 1 to 5, which is used for recovering the elemental sulfur-containing material.

7. The blast furnace gas sulfur recovery system of claim 6, further comprising a desorption device comprising a first conduit, a second conduit, and a desorber; a first conveying pump is arranged on the first pipeline, and a second conveying pump is arranged on the second pipeline;

the hydrolysis device comprises a first feeding hole and a first discharging hole, the desorber is communicated with the first feeding hole through the first pipeline, and the desorber is also communicated with the first discharging hole through the second pipeline;

and/or, the catalytic device comprises a second feeding hole and a second discharging hole, the desorber is communicated with the second feeding hole through the first pipeline, and the desorber is also communicated with the second discharging hole through the second pipeline.

8. The blast furnace gas sulfur recovery system of claim 7, wherein the desorber has a desorption chamber therein, and heating tubes are disposed in the desorption chamber, and the heating tubes are helical in shape.

9. The blast furnace gas sulfur recovery system of claim 7,

when the desorber is communicated with the first feed port through the first pipeline and is communicated with the first discharge port through the second pipeline, the desorption apparatus further comprises:

the first transition bin is arranged on a first pipeline and is communicated with the first feed inlet through the first air locker;

when the desorber is communicated with the second feed inlet through the first pipeline and is also communicated with the second discharge outlet through the second pipeline, the desorption device further comprises:

the third transition bin is arranged on the first pipeline and is communicated with the second feed inlet through the third air locker;

10. The blast furnace gas sulfur recovery system of claim 6, further comprising:

the first heat exchanger is arranged between the gas dehumidifier and the gas heater and is used for heating the blast furnace gas cooled and dehumidified by the gas dehumidifier and introducing the heated blast furnace gas into the gas heater;

the second heat exchanger is arranged between the catalytic device and the sulfur recovery device and is used for cooling the blast furnace gas treated by the catalytic device and introducing the cooled blast furnace gas into the sulfur recovery device;

the first heat exchanger is connected with the second heat exchanger through a heat exchange pipeline.