Blast furnace gas desulfurization system with temperature regulating and water controlling device

Abstract

The utility model provides a blast furnace gas desulfurization system with a temperature regulating and water controlling device, which relates to the technical field of gas desulfurization, and comprises at least one desulfurization tower, the temperature regulating and water controlling device is arranged in the desulfurization tower, and the temperature regulating and water controlling device comprises an inlet header pipe and a plurality of coil pipe structures, the multiple coil pipe structures are sequentially arranged at intervals in the flowing direction of coal gas in the desulfurizing tower, each coil pipe structure is provided with a gas inlet pipe and at least one heat exchange coil pipe, the gas inlet pipe is connected with the inlet header pipe through the adjusting valve, one end of each heat exchange coil pipe is connected with the gas inlet pipe, and the other end of each heat exchange coil pipe is connected with a drain pipe. The blast furnace gas desulfurization system with the temperature regulating and water controlling device can effectively regulate and control the temperature of gas in the desulfurization tower.

Description

Technical Field

[0001] The utility model relates to the technical field of coal gas desulfurization, in particular to a blast furnace coal gas desulfurization system with a temperature regulating and water controlling device. Background Art

[0002] Coal gas is one of the important fuels and raw materials in the iron and steel metallurgy, petrochemical and other industries. It is widely used. For example, as a fuel, it can be used for heating in coke ovens, hot blast stoves, tubular furnaces, pelletizing and other processes. It can be used for TRT units, BPRT units, etc. by using residual pressure power generation. As a fuel, due to the high content of sulfides and other substances in blast furnace gas, the sulfur dioxide concentration in the hot flue gas after combustion exceeds the standard and cannot meet the requirements of environmental protection regulations; as a chemical raw material, a high sulfide content will also affect the quality of the synthetic product. Therefore, only by effectively removing sulfides from coal gas can the quality of the purified coal gas meet the standard requirements of different user points such as residual pressure power generation, direct combustion, combustion power generation, chemical raw materials or purification. In the process of desulfurization of coal gas, due to the large temperature pressure and temperature fluctuations of blast furnace gas, the content of mechanical water and saturated water it carries will have a great impact on the desulfurization effect of the desulfurization system.

[0003] In view of this, the inventor, based on many years of experience in production design in this field and related fields, has designed a blast furnace gas desulfurization system with a temperature and water control device after repeated experiments, in order to solve the problems existing in the prior art. Utility Model Content

[0004] The utility model aims to provide a blast furnace gas desulfurization system with a temperature regulating and water controlling device, which can effectively regulate the gas temperature in a desulfurization tower.

[0005] To achieve the above-mentioned purpose, the utility model proposes a blast furnace gas desulfurization system with a temperature control and water control device, wherein the blast furnace gas desulfurization system includes at least one desulfurization tower, and a temperature control and water control device is installed in the desulfurization tower. The temperature control and water control device includes an inlet main pipe and a plurality of coil structures. The plurality of coil structures are sequentially spaced along the flow direction of the gas in the desulfurization tower. Each of the coil structures has an air inlet pipe and at least one heat exchange coil. The air inlet pipe is connected to the inlet main pipe through a regulating valve, one end of the heat exchange coil is connected to the air inlet pipe, and the other end of the heat exchange coil is connected to a drain pipe.

[0006] In the blast furnace gas desulfurization system with the temperature and water control device as described above, the heat exchange coil is perpendicular to the flow direction of the gas in the desulfurization tower, and the heat exchange coil is arranged in a serpentine shape.

[0007] In the blast furnace gas desulfurization system with the temperature and water control device as described above, the coil structure includes two symmetrically arranged heat exchange coils, and the two heat exchange coils are connected in parallel to the air inlet pipe.

[0008] In the blast furnace gas desulfurization system with the temperature and water control device as described above, heat exchange fins are arranged outside the heat exchange coil.

[0009] In the blast furnace gas desulfurization system with the temperature regulating and water controlling device as described above, each of the drain pipes is provided with a drain valve.

[0010] The blast furnace gas desulfurization system with a temperature regulating and water controlling device as described above, wherein a packing layer is provided at the upper portion of the desulfurization tower, a gas inlet is opened at the lower portion of the desulfurization tower, the temperature regulating and water controlling device is provided between the packing layer and the gas inlet, and a plurality of the coil structures are arranged sequentially from bottom to top.

[0011] In the blast furnace gas desulfurization system with the temperature and water control device as described above, each of the heat exchange coils is arranged horizontally.

[0012] In the blast furnace gas desulfurization system with the temperature regulating and water controlling device as described above, a first temperature detector is installed at the gas inlet, and a second temperature detector is installed in the desulfurization tower.

[0013] The blast furnace gas desulfurization system with a temperature control and water control device as described above, wherein the temperature control and water control device also includes a control element, and the control element is electrically connected to the first temperature detector, the second temperature detector and each of the regulating valves, respectively, and the control element controls the opening of each of the regulating valves according to the detection difference between the first temperature detector and the second temperature detector.

[0014] The blast furnace gas desulfurization system with the temperature regulating and water controlling device as described above, wherein the blast furnace gas desulfurization system comprises a plurality of the desulfurization towers, each of which is respectively provided with the temperature regulating and water controlling device.

[0015] Compared with the prior art, the utility model has the following characteristics and advantages:

[0016] The utility model proposes a blast furnace gas desulfurization system with a temperature regulating and water controlling device. The temperature regulating and water controlling device is arranged in the desulfurization tower. The steam flow in each coil structure of the temperature regulating and water controlling device can be controlled individually. For the inlet gas of different temperatures, the temperature regulating and water controlling device can reach different heating temperatures by adjusting the steam flow in each coil structure, thereby heating the inlet gas to an ideal temperature, avoiding large fluctuations in the gas temperature in the desulfurization tower, and finally maintaining the stability of the desulfurization effect.

[0017] The utility model proposes a blast furnace gas desulfurization system with a temperature and water control device, and each coil structure is installed with an independently controllable regulating valve, which can flexibly adjust the amount of steam entering each coil structure according to actual needs, so that the desulfurization tower can better adapt to different working conditions and load changes, reasonably control the temperature and humidity of the gas in the desulfurization tower, reduce the influence of blast furnace gas mechanical water and saturated water on the desulfurization system, improve the desulfurization efficiency, and reduce the energy consumption required in the desulfurization process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0019] Figure 1 This is a schematic diagram of the structure of a blast furnace gas desulfurization system with a temperature and water control device proposed by the utility model;

[0020] Figure 2 It is a schematic diagram of the temperature regulating and water controlling device in the utility model;

[0021] Figure 3 It is a schematic diagram of the coil structure in the utility model.

[0022] Description of Reference Numerals

[0023] 100. Desulfurization tower; 10. Gas import;

[0024] 20. Temperature and water control device; 21. Inlet main pipe;

[0025] 22. Coil structure; 221. Air intake pipe;

[0026] 222. Heat exchange coil; 223. Drain pipe;

[0027] 224. Regulating valve; 225. Steam trap;

[0028] 226. Heat exchange fins; 30. Packing layer. DETAILED DESCRIPTION

[0029] The details of the present invention can be more clearly understood by combining the accompanying drawings with the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention.

[0030] Unless otherwise specified, the directions of up, down, left, and right mentioned in this document are all based on the directions shown in this utility model. Figure 1 The up, down, left and right directions in the figure shall prevail and are explained here.

[0031] like Figures 1 to 3 As shown, the utility model proposes a blast furnace gas desulfurization system with a temperature control and water control device, the blast furnace gas desulfurization system includes at least one desulfurization tower 100, a temperature control and water control device 20 is installed in the desulfurization tower 100, the temperature control and water control device 20 includes an inlet main pipe 21 and a plurality of coil structures 22, the plurality of coil structures 22 are sequentially arranged along the flow direction of the gas in the desulfurization tower 100, each coil structure 22 has an air inlet pipe 221 and at least one heat exchange coil 222, the air inlet pipe 221 is connected to the inlet main pipe 21 through a regulating valve 224, one end of the heat exchange coil 222 is connected to the air inlet pipe 221, and the other end of the heat exchange coil 222 is connected to a drain pipe 223.

[0032] The utility model proposes a blast furnace gas desulfurization system with a temperature regulating and water controlling device. A temperature regulating and water controlling device 20 is arranged in a desulfurization tower 100. The steam flow in each coil structure 22 of the temperature regulating and water controlling device 20 can be controlled individually. For inlet gas of different temperatures, the temperature regulating and water controlling device 20 can reach different heating temperatures by adjusting the steam flow in each coil structure 22, thereby heating the inlet gas to an ideal temperature, avoiding large fluctuations in the gas temperature in the desulfurization tower, and ultimately maintaining the stability of the desulfurization effect.

[0033] The utility model proposes a blast furnace gas desulfurization system with a temperature and water control device, and each coil structure 22 is installed with an independently controllable regulating valve 224, which can flexibly adjust the amount of steam entering each coil structure 22 according to actual needs, so that the desulfurization tower 100 can better adapt to different working conditions and load changes, reasonably control the temperature and humidity of the gas in the desulfurization tower 100, reduce the impact of blast furnace gas mechanical water and saturated water on the desulfurization system, improve the desulfurization efficiency, and reduce the energy consumption required in the desulfurization process.

[0034] In an optional embodiment of the present invention, as Figure 2As shown, the heat exchange coil 222 is perpendicular to the flow direction of the coal gas in the desulfurization tower 100, and the heat exchange coil 222 is arranged in a serpentine coil. The above structure can ensure that the coal gas is fully in contact with the coil structure 22 during the flow process, thereby achieving effective temperature and humidity regulation. In addition, after the coal gas passes through multiple coil structures 22, it is continuously blocked and dispersed by multiple heat exchange coils 222, making the distribution of the coal gas in the desulfurization tower more uniform, optimizing the airflow distribution of the coal gas entering the tower.

[0035] In an optional example of this embodiment, for two vertically adjacent coil structures 22, the heat exchange coils 222 in the two coil structures 22 are staggered in the vertical direction, that is, the vertical projections of the heat exchange coils 222 do not overlap, or only partially overlap, so that the coil structures 22 are distributed more evenly in the desulfurization tower 100, so that the coal gas can be dispersed more evenly during the upward flow of the coal gas.

[0036] In an optional example of the present invention, the coil structure 22 includes two symmetrically arranged heat exchange coils 222, and the two heat exchange coils 222 are connected in parallel to the air intake pipe 221. The symmetrical arrangement of the two heat exchange coils 222 avoids the problem of uneven flow or blockage that may occur in a single pipeline, which helps to improve the stability and efficiency of the overall desulfurization process.

[0037] Furthermore, the heat exchange coil 222 is serpentinely coiled into a semicircular structure, and the two symmetrically arranged heat exchange coils 222 are assembled into a circular connection structure, so that the heat exchange coil 222 can be evenly distributed in the circular cross-section of the desulfurization tower 100, thereby improving the heating efficiency and uniformity of the coal gas.

[0038] In an optional example of the present invention, each heat exchange coil 222 is provided with a heat exchange fin 226 to further increase the heat exchange efficiency between the heat exchange coil 222 and the coal gas.

[0039] Furthermore, the heat exchange fins 226 are spirally wound around the outer wall of the heat exchange coil 222 .

[0040] Specifically, the specific size and shape of the heat exchange fins 226 are determined according to the heating amount and the size of the tower tray.

[0041] In an optional embodiment of the present invention, a drain valve 225 is provided on the drain pipe 223, which not only avoids steam leakage but also ensures that the condensed water in the heat exchange coil 222 can be discharged in time.

[0042] In an optional embodiment of the utility model, a packing layer 30 is provided at the upper part of the desulfurization tower 100, a gas inlet 10 is provided at the lower part of the desulfurization tower 100, a temperature control and water control device 20 is provided between the packing layer 30 and the gas inlet 10, and a plurality of coil structures 22 are arranged sequentially from bottom to top. With the above structure, the inlet gas entering the tower from the gas inlet 10 passes through the plurality of coil structures 22 in sequence, and is heated step by step in layers, which not only avoids the rapid change of the gas temperature, but also ensures the final temperature of the heated gas, which is more energy-saving and environmentally friendly. The heated gas enters the packing layer 30 for desulfurization, which further optimizes the conditions of the desulfurization reaction, improves the desulfurization efficiency, and avoids secondary pollution.

[0043] In an optional example of this embodiment, each heat exchange coil 222 is arranged horizontally.

[0044] In an optional example, the air inlet pipe 221 and the drain pipe are also arranged horizontally. Further, the air inlet pipe 221 and the drain pipe are respectively arranged along the radial direction of the desulfurization tower 100 and have an angle of 90 degrees.

[0045] In an optional example, the heat exchange coil 222 can be detachably installed in the desulfurization tower 100 .

[0046] Furthermore, the heat exchange coil 222 is installed in the desulfurization tower 100 through a channel steel tube.

[0047] Specifically, the channel steel support tube is horizontally arranged, and both ends of the channel steel support tube are respectively fixedly connected to the inner wall of the desulfurization tower 100, and the heat exchange coil 222 is arranged above the channel steel support tube and is detachably installed on the channel steel support tube by bolts.

[0048] In an optional example of this embodiment, a first temperature detector (not shown in the figure) is installed at the gas inlet 10, and the temperature detector can measure the inlet gas temperature at the gas inlet 10. A second temperature detector is provided in the desulfurization tower 100 to timely adjust the steam flow in each coil structure 22 according to the inlet gas temperature and the temperature inside the tower.

[0049] Furthermore, the temperature control and water control device 20 further includes a control element (not shown in the figure), which is electrically connected to the first temperature detector, the second temperature detector and each regulating valve 224, respectively, and the control element controls the opening of each regulating valve 224 according to the difference between the temperature of the gas entering the tower and the temperature inside the tower. With the above structure, the control element can control the opening of each regulating valve 224 in real time according to the real-time detection data of the first temperature detector and the second temperature detector, thereby accurately controlling the heating temperature of each coil structure 22 in the temperature control and water control device 20, and finally realizing accurate control of the gas temperature.

[0050] In an optional example of the present invention, the blast furnace gas desulfurization system includes a plurality of desulfurization towers 100 , and each desulfurization tower 100 is provided with a temperature control and water control device 20 .

[0051] Please refer to Figures 1 to 3 Now, in conjunction with an embodiment, the specific implementation process of the blast furnace gas desulfurization system with a temperature and water control device proposed by the utility model is described in detail.

[0052] In this embodiment, the blast furnace gas desulfurization system of the temperature control and water control device is provided with a total of 5 desulfurization towers 100, ABCDE, each desulfurization tower 100 is equipped with a temperature control and water control device 20, and each temperature control and water control device 20 is composed of 6 (layers) of coil structures 22. The temperature control and water control device 20 equipped with each desulfurization tower 100 can be independently controlled, and the 6 layers of coil structures 22 constituting each temperature control and water control device 20 can be independently controlled. In each desulfurization tower 100, the temperature control and water control device 20 is arranged above the gas inlet 10 of the desulfurization tower 100, and below the bottom layer of the desulfurizer of the packing layer 30 in the desulfurization tower 100.

[0053] In each coil structure 22, two ends of the regulating valve 224 are respectively connected to the inlet main pipe 21 and the air inlet pipe 221. The steam is sent to the regulating valve 224 through the inlet main pipe 21. The regulating valve 224 controls the valve opening according to the difference between the gas temperature and the temperature inside the tower. The regulated steam enters the heat exchange coil 222 through the air inlet pipe 221. The steam runs in the heat exchange coil 222 to heat the gas outside the heat exchange coil 222. The steam is divided into two paths through the two heat exchange coils 222 and then sent to two drain pipes 223 respectively. The steam cooled by heat exchange in the heat exchange coil 222 is discharged through the drain pipe 223. The heat exchange coil 222 is laid horizontally in the tower, and the air inlet pipe 221 and two drain pipes 223 are also laid horizontally. Starting from the air inlet pipe 221, rotating 90 degrees in the clockwise direction, there is a first drain pipe 223, and starting from the air inlet pipe 221, rotating 270 degrees in the clockwise direction, there is a second drain pipe 223. The heat exchange coil 222 is composed of n sections of coil segments with spiral fins, and each section of the coil segments with spiral fins is connected by flanges or directly welded.

[0054] In this embodiment, the blast furnace gas desulfurization system is adjacent to the TRT device and is located after the TRT. The gas parameters of the blast furnace gas entering the blast furnace gas desulfurization system are gas volume 130,000 to 286,000 Nm3 / h, pressure 10 to 22 kpa, and temperature 40 to 75°C. After the blast furnace gas enters the desulfurization system, it first enters the desulfurization tower through the gas inlet 10 at the bottom of the desulfurization tower 100. After the gas entering the desulfurization tower 100 is temperature-controlled by the temperature and water control device 20, it is sent to the upper packing layer 30 of the desulfurization tower 100 for desulfurization. The desulfurized blast furnace gas is sent to the user point through the tower top pipeline.

[0055] In this embodiment, the specific operation process of the blast furnace gas desulfurization system is as follows:

[0056] According to the detection by the first temperature detector and the second temperature detector, the gas temperature at the gas inlet 10 of the desulfurization tower 100 is T1, the temperature inside the desulfurization tower 100 is T2, and the temperature difference △T=T2-T1.

[0057] When △T≥20℃ of the X tower (X is any one of the five desulfurization towers ABCDE) in the blast furnace gas desulfurization system, the inlet regulating valves of the tower are automatically opened by 1 to 2, that is, 1 to 2 coil structures 22 are put into operation; when 20℃>△T≥15℃, the inlet regulating valve group of the tower is automatically opened by 2 to 3, that is, 2 to 3 coil structures 22 are put into operation; when 15℃>△T≥10℃, the inlet regulating valve of the tower is automatically opened by 3 to 4, that is, 3 to 4 coil structures 22 are put into operation; when 10℃>△T≥5℃, the inlet regulating valve group of the tower is automatically opened by 4 to 5, that is, 4 to 5 coil structures 22 are put into operation; when 5℃>△T, the inlet regulating valve group of the tower is automatically opened by 5 to 6, that is, 5 to 6 coil structures 22 are put into operation.

[0058] Since the external steam pressure fluctuates between 0.16 and 0.43 MPa, the number of coil structures 22 opened and the size of the opening can be adjusted according to the incoming steam pressure. When the incoming steam pressure is greater than 0.3 MPa, it fluctuates with △T, and the opening of the inlet regulating valve executes the lower limit opening of the interval. When the incoming steam pressure is ≤0.3 MPa, it fluctuates with △T, and the opening of the inlet regulating valve executes the upper limit opening of the interval. For example, when the incoming steam pressure is 0.25 MPa, △T=8°C, then 5 heat exchange coils 222 are opened, and when the incoming steam pressure is 0.35 MPa, △T=8°C, then 4 coil structures 22 are opened.

[0059] The blast furnace gas desulfurization system with a temperature and water control device proposed in the utility model can accurately control the gas temperature in the desulfurization tower 100 and effectively reduce the impact of blast furnace gas mechanical water and saturated water on the desulfurization system.

[0060] The blast furnace gas desulfurization system with a temperature regulating and water controlling device proposed in the utility model realizes layered and step-by-step temperature increase of the gas through a plurality of coil structures 22, which effectively saves energy and has no secondary pollution.

[0061] The utility model proposes a blast furnace gas desulfurization system with a temperature and water control device. The multiple coil structures 22 arranged in the desulfurization tower 100 can not only heat the gas entering the tower, but also optimize the gas flow distribution of the gas entering the tower, thereby improving the desulfurization efficiency.

[0062] The blast furnace gas desulfurization system with a temperature regulating and water controlling device proposed by the utility model has a small equipment scale, a small overall footprint, low material requirements and low overall investment.

[0063] The detailed explanation of the above-mentioned embodiments is only intended to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limitations on the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless there is a clear description to the contrary, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.

Claims

1. A blast furnace gas desulfurization system with a temperature and water control device, characterized in that: The blast furnace gas desulfurization system includes at least one desulfurization tower, in which a temperature control and water control device is installed. The temperature control and water control device includes an inlet main pipe and a plurality of coil structures. The plurality of coil structures are sequentially spaced along the flow direction of the gas in the desulfurization tower. Each of the coil structures has an air inlet pipe and at least one heat exchange coil. The air inlet pipe is connected to the inlet main pipe through a regulating valve, one end of the heat exchange coil is connected to the air inlet pipe, and the other end of the heat exchange coil is connected to a drain pipe.

2. The blast furnace gas desulfurization system with a temperature and water control device according to claim 1, characterized in that: The heat exchange coil is perpendicular to the flow direction of the coal gas in the desulfurization tower, and the heat exchange coil is arranged in a serpentine shape.

3. The blast furnace gas desulfurization system with a temperature and water control device according to claim 2, characterized in that: The coil structure includes two symmetrically arranged heat exchange coils, and the two heat exchange coils are connected in parallel to the air inlet pipe.

4. The blast furnace gas desulfurization system with a temperature and water control device according to claim 1, characterized in that: Heat exchange fins are arranged outside the heat exchange coil.

5. The blast furnace gas desulfurization system with a temperature and water control device according to claim 1, characterized in that: Each of the drain pipes is provided with a drain valve.

6. The blast furnace gas desulfurization system with a temperature and water control device according to claim 1, characterized in that: A packing layer is arranged at the top of the desulfurization tower, a gas inlet is opened at the bottom of the desulfurization tower, the temperature and water control device is arranged between the packing layer and the gas inlet, and a plurality of the coil structures are arranged sequentially from bottom to top.

7. The blast furnace gas desulfurization system with a temperature and water control device according to claim 6, characterized in that: Each of the heat exchange coils is arranged horizontally.

8. The blast furnace gas desulfurization system with a temperature and water control device according to claim 6, characterized in that: A first temperature detector is installed at the gas inlet, and a second temperature detector is installed in the desulfurization tower.

9. The blast furnace gas desulfurization system with a temperature and water control device according to claim 8, characterized in that: The temperature and water control device also includes a control element, which is electrically connected to the first temperature detector, the second temperature detector and each of the regulating valves, and controls the opening of each of the regulating valves according to the detection difference between the first temperature detector and the second temperature detector.

10. The blast furnace gas desulfurization system with a temperature and water control device according to claim 1, characterized in that: The blast furnace gas desulfurization system comprises a plurality of the desulfurization towers, and each of the desulfurization towers is respectively provided with the temperature regulating and water controlling device.

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