Blast furnace gas dechlorination tower with water seal cut-off function

Abstract

The utility model discloses a blast furnace gas dechlorination tower with a water seal cut-off function. The blast furnace gas dechlorination tower comprises a gas inlet system, a gas outlet system and a chlorine water spray pipe system, the system further comprises a gas desulfurization tower and a water seal pipeline system. The gas desulfurization tower comprises a tower body, the tower body is of an empty tower structure, the tower body is vertically arranged, and the bottom of the tower body is attached to the ground and fixedly arranged; the tower body is provided with a water inlet, a water outlet and an exhaust port; a coal gas inlet pipeline is arranged in the coal gas inlet system, is connected to the side wall of the tower body, extends into the tower body and is vertically arranged downwards in the tower body, and an outlet of the coal gas inlet pipeline is positioned between the water inlet and the water outlet. The blast furnace gas dechlorination tower has the water seal cut-off function and the water washing dechlorination function at the same time, gas conveying can be smoother, and arrangement of cut-off butterfly valves is reduced; and the arrangement of independent water seals can be reduced, the system resistance is effectively reduced, and the later equipment maintenance workload is reduced.

Description

Technical Field

[0001] The utility model relates to the field of blast furnace gas transmission and distribution systems, in particular to a blast furnace gas dechlorination tower with a water seal cut-off function. Background Art

[0002] The raw gas produced during blast furnace smelting contains dust and harmful substances such as chlorine, sulfur, and ammonia. Therefore, blast furnace gas needs to be dusted before discharge, that is, chlorine, sulfur, ammonia and other harmful substances are removed.

[0003] Currently, blast furnace gas dechlorination is primarily accomplished through dry and wet methods. Wet dechlorination typically involves spraying alkali solution through pipelines, with butterfly valves and water seals / slide valves often used as reliable shutoff devices before the gas scrubber. Externally located reliable shutoff devices increase the system footprint, increase system resistance due to excessive equipment, and complicate maintenance. Utility Model Content

[0004] In response to the above-mentioned defects in the existing technology, a blast furnace gas dechlorination tower with a water seal cut-off function is provided. The water seal cut-off function and the water washing dechlorination function are combined into one, making the gas transportation smoother, reducing the layout of the cut-off valve, effectively reducing the system resistance, and reducing the workload of subsequent equipment maintenance.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] The blast furnace gas dechlorination tower with water seal cut-off function includes a gas inlet system, a gas outlet system, and a chlorine water spray pipe system; it is characterized in that it also includes a gas desulfurization tower and a water seal pipeline system.

[0007] The coal gas desulfurization tower includes a tower body, which adopts a hollow tower structure and is arranged vertically with its bottom fixed to the ground. The tower body is provided with a water inlet, a drain outlet, and an exhaust outlet, with the water inlet located above the drain outlet. A coal gas inlet pipe is provided in the coal gas inlet system, which is connected to the side wall of the tower body, extends into the tower body, and is arranged vertically downward in the tower body, with the outlet of the coal gas inlet pipe located between the water inlet and the drain outlet. A water seal piping system is connected to the sub-water inlet and the drain outlet to control the relative position between the water level in the tower body and the gas inlet pipe.

[0008] The gas outlet system is connected to the exhaust port on the top of the tower body, and the chlorine water spray pipe system is connected to the upper side wall of the tower body.

[0009] According to the above technical solution, the chlorine water spray pipe system includes multiple layers of alkali solution spray layers and spray water supply pipelines. The multiple layers of alkali solution spray layers are arranged at intervals in the vertical direction of the tower body, and spray guns are installed in the alkali solution spray layers; the spray water supply pipeline adopts the existing structure and is connected to the spray guns of each layer of alkali solution spray layer, and a regulating valve is installed in the spray water supply pipeline.

[0010] According to the above technical solution, each spray layer contains multiple spray guns, which are arranged circumferentially at intervals on the tower body, and the spray guns of each spray layer are located on the same horizontal plane; each spray gun is connected to the spray water supply pipeline.

[0011] According to the above technical solution, each spray layer contains three spray guns, and the angle between the axes of two adjacent spray guns is 120°.

[0012] According to the above technical solution, it also includes a mechanical water removal layer, which is arranged on the inner wall of the upper part of the tower body and located between the gas outlet system and the chlorine water spray pipe system.

[0013] According to the above technical solution, the mechanical water removal layer adopts a stainless steel perforated plate corrugated structure.

[0014] According to the above technical solution, glass flakes are coated inside the tower body.

[0015] According to the above technical solution, an overflow port is provided on the side wall of the tower body; a liquid level gauge is also provided, and the liquid level gauge is interlocked with the water supply pipeline for control.

[0016] According to the above technical solution, a pressure detection sensor and a temperature detection sensor are also provided; a purge head is also provided, and the purge head is provided on the side wall of the tower body.

[0017] According to the above technical solution, a manhole for inspecting the interior of the tower body is provided on the side wall of the tower body, and a sewage outlet is provided at the bottom of the side wall.

[0018] The utility model has the following beneficial effects:

[0019] 1. By installing a water inlet and drain port on the gas desulfurization tower that matches the water seal piping system, water is injected into the tower body through the water seal piping system to a level higher than the gas inlet pipe, thus forming a water seal within the tower body. This allows the tower body to function as a water seal cutoff. After the gas system maintenance is completed, the bottom drain valve is opened, the water is vented, and the tower body can be used as a gas dechlorination tower. These measures enable this blast furnace gas dechlorination tower to simultaneously perform both water seal cutoff and water washing dechlorination functions. This not only streamlines gas delivery and reduces the need for cutoff butterfly valves, but also eliminates the need for independent water seals, effectively reducing system resistance and subsequent equipment maintenance workload.

[0020] 2. A spray gun is installed in the tower body to spray and clean chloride ions. The dechlorination efficiency can reach more than 95% with low water consumption. In addition, a dehydration filler layer is set on the upper part of the alkali solution spray layer to further remove chloride ions in the coal gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an embodiment provided by the utility model;

[0022] Figure 2 This is a schematic structural diagram of the tower body of the embodiment provided by the utility model (after adding water);

[0023] Figure 3 This is a schematic structural diagram of a tower body according to an embodiment of the present invention;

[0024] In the figure, 1. Gas intake system; 2. Gas outlet system; 2-1. Gas inlet pipe; 3. Chlorine water spray pipe system; 3-1. Alkali solution spray layer; 3-11. Spray gun; 3-2. Spray water supply pipeline; 4. Gas desulfurization tower; 4-1. Tower body; 4-2. Water inlet; 4-3. Drain outlet; 4-4. Overflow outlet; 4-5. Liquid level gauge; 4-6. Pressure detection sensor; 4-7. Temperature detection sensor; 4-8. Purge head; 4-9. Manhole; 4-10. Sewage outlet; 4-11. Exhaust outlet; 5. Water seal pipeline system; 5-1. Water supply pipeline structure; 5-2. Drainage pipeline structure; 6. Mechanical water removal layer. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0026] Reference Figures 1 to 3 As shown, the utility model provides a blast furnace gas dechlorination tower with a water seal cut-off function.

[0027] Example 1

[0028] It includes a gas intake system 1, a gas outlet system 2, and a chlorine water spray pipe system 3, as well as a gas desulfurization tower 4 and a water seal piping system 5. The gas desulfurization tower includes a tower body 4-1, which adopts an empty tower structure, is arranged vertically, and has a bottom fixed to the ground; a water inlet 4-2, a drain outlet 4-3, and an exhaust outlet 4-11 are provided on the tower body, and the water inlet is located above the drain outlet; a gas inlet pipe 2-1 is provided in the gas intake system, and the gas inlet pipe is connected to the side wall of the tower body, extends into the tower body, and is arranged vertically downward in the tower body, with the outlet of the gas inlet pipe located between the water inlet and the drain outlet; the water seal piping system is connected to the sub-water inlet and the drain outlet, and is used to control the relative position between the water level in the tower body and the gas inlet pipe;

[0029] The gas outlet system is connected to the exhaust port on the top of the tower body, and the chlorine water spray pipe system is connected to the upper side wall of the tower body.

[0030] In this embodiment, a water inlet and drain port compatible with the water seal piping system are installed on the gas desulfurization tower. Water is injected into the tower body through the water seal piping system to a level higher than the gas inlet pipe, submerging the gas inlet pipe in the water. This creates a water seal within the tower body. This allows the tower body to function as a water seal cutoff. Once the gas system is overhauled, the bottom drain valve is opened, the water is drained, and the tower body can then be used as a gas dechlorination tower. Based on these measures, this blast furnace gas dechlorination tower simultaneously possesses both a water seal cutoff function and a water washing and dechlorination function. This not only streamlines gas delivery and reduces the need for butterfly valves, but also eliminates the need for independent water seals, effectively reducing system resistance and the workload for subsequent equipment maintenance.

[0031] In this embodiment, the gas intake system and the gas outlet system are both existing structures and are not summarized in this application; in addition, the water seal pipeline system adopts a common water supply pipeline structure 5-1 and a drainage pipeline structure 5-2. The water supply pipeline structure is composed of pipelines, valves, water pumps and water supply sources, and the drainage pipeline structure is composed of pipelines, valves, and water storage tanks; they are all common structures and are not summarized.

[0032] Example 2

[0033] The structure and principles of Example 2 are similar to those of Example 1, differing in that a chlorine water spray pipe system is provided. The chlorine water spray pipe system comprises multiple layers of alkali spray layers 3-1 and a spray water supply line 3-2. The multiple layers of alkali spray layers are arranged vertically in intervals, each layer being equipped with a spray gun. The spray water supply line utilizes an existing structure and is connected to the spray guns of each alkali spray layer. A regulating valve is installed within the spray water supply line. When the blast furnace gas dechlorination tower is operating normally for gas spray dechlorination, the spray water supply line is opened, and a regulating valve is installed on the spray water supply line to adjust the alkali solution and control the water spray rate according to the chloride ion content in the gas. The figure shows a two-layer alkali spray layer.

[0034] In Example 2, each spray layer includes multiple spray guns 3-11, which are spaced circumferentially around the tower body and positioned on the same horizontal plane. Each spray gun is connected to a spray water supply line. In this embodiment, the spray guns spray alkaline solution into the tower body to remove chloride ions, achieving a dechlorination efficiency exceeding 95% with low water consumption.

[0035] Preferably, each spray layer contains three spray guns, and the angle between the axes of two adjacent spray guns is 120 degrees. The angle can be adjusted according to the diameter of the tower body to ensure full coverage of the spray range.

[0036] Example 3

[0037] The structure and principle of Example 3 are similar to those of Example 1 or 2, except that it also includes a mechanical water removal layer 6, which is arranged on the upper inner wall of the tower body and located between the gas outlet system and the chlorine water spray pipe system.

[0038] The mechanical water removal layer adopts a stainless steel orifice plate corrugated structure. The water seal in the gas condenses on the stainless steel orifice plate and gathers at the bottom of the tower body. It has the characteristics of not easy to be blocked, large flow rate, small resistance, and low pressure drop, and can effectively block the impact of mechanical water on the gas system.

[0039] In Examples 1-3, glass flakes are coated inside the tower body, which effectively reduces the corrosion of chloride salts on the tower body and extends the service life of the equipment.

[0040] In Examples 1-3, an overflow port 4-4 is further provided on the side wall of the tower body, and the overflow port is connected to the drainage pipe structure of the water seal pipe system, and the overflow port is used to adjust the water level in the tower body; a liquid level gauge 4-5 is also provided, and the liquid level gauge is interlocked with the water supply pipe to adjust the liquid level height in the tower body through the liquid level gauge in conjunction with the water seal pipe system.

[0041] In Examples 1-3, a pressure detection sensor 4-6 and a temperature detection sensor 4-7 are also provided for measuring the pressure and temperature in the tower body, so as to facilitate the detection of reaction data in the tower body; a purge head 4-8 is also provided, which is provided on the side wall of the tower body and is used to purge the remaining coal gas in the tower body.

[0042] In Examples 1-3, a manhole 4-9 for inspecting the interior of the tower body is provided on the side wall of the tower body, and a sewage outlet 4-10 is provided at the bottom of the side wall for discharging sewage that has been used and accumulated at the bottom of the tower body.

[0043] The above are merely preferred embodiments of the present invention and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope of protection of the present invention.

Claims

1. A blast furnace gas dechlorination tower with a water seal cut-off function, comprising a gas inlet system, a gas outlet system, and a chlorine water spray pipe system; characterized by: It also includes a gas desulfurization tower and a water seal piping system. The coal gas desulfurization tower includes a tower body, which adopts a hollow tower structure and is arranged vertically with its bottom fixed to the ground. The tower body is provided with a water inlet, a drain outlet, and an exhaust outlet, with the water inlet located above the drain outlet. A coal gas inlet pipe is provided in the coal gas inlet system, which is connected to the side wall of the tower body, extends into the tower body, and is arranged vertically downward in the tower body, with the outlet of the coal gas inlet pipe located between the water inlet and the drain outlet. A water seal piping system is connected to the sub-water inlet and the drain outlet to control the relative position between the water level in the tower body and the gas inlet pipe. The gas outlet system is connected to the exhaust port on the top of the tower body, and the chlorine water spray pipe system is connected to the upper side wall of the tower body.

2. The blast furnace gas dechlorination tower with water seal cut-off function according to claim 1, characterized in that: The chlorine water spray pipe system includes multiple layers of alkali solution spray layers and spray water supply pipelines. The multiple layers of alkali solution spray layers are arranged at intervals in the vertical direction of the tower body, and spray guns are installed in the alkali solution spray layers; the spray water supply pipeline adopts the existing structure and is connected to the spray guns of each layer of alkali solution spray layer, and a regulating valve is installed in the spray water supply pipeline.

3. The blast furnace gas dechlorination tower with water seal cut-off function according to claim 2, characterized in that: Each spray layer contains multiple spray guns, which are arranged at intervals on the tower body in a circumferential direction, and the spray guns of each spray layer are located on the same horizontal plane; each spray gun is connected to the spray water supply pipeline.

4. The blast furnace gas dechlorination tower with water seal cut-off function according to claim 3, characterized in that: Each spray layer contains three spray guns, and the angle between the axes of two adjacent spray guns is 120°.

5. The blast furnace gas dechlorination tower with water seal cut-off function according to any one of claims 1 to 4, characterized in that: It also includes a mechanical water removal layer, which is arranged on the inner wall of the upper part of the tower body and located between the gas outlet system and the chlorine water spray pipe system.

6. The blast furnace gas dechlorination tower with water seal cut-off function according to claim 5, characterized in that: The mechanical water removal layer adopts a stainless steel perforated plate corrugated structure.

7. The blast furnace gas dechlorination tower with water seal cut-off function according to any one of claims 1 to 4, characterized in that: Glass flakes are coated on the tower body.

8. The blast furnace gas dechlorination tower with water seal cut-off function according to any one of claims 1 to 4, characterized in that: An overflow port is also provided on the side wall of the tower body; a liquid level gauge is also provided, and the liquid level gauge is interlocked with the water supply pipeline for control.

9. The blast furnace gas dechlorination tower with water seal cut-off function according to any one of claims 1 to 4, characterized in that: It is also provided with a pressure detection sensor and a temperature detection sensor; and also includes a purge head which is arranged on the side wall of the tower body.

10. The blast furnace gas dechlorination tower with water seal cut-off function according to any one of claims 1 to 4, characterized in that: A manhole for inspecting the interior of the tower is provided on the side wall of the tower body, and a sewage outlet is provided at the bottom of the side wall.

Images