Two-way gas inlet and outlet fixed bed desulfurization system

Abstract

The invention discloses a two-way gas inlet and outlet fixed bed desulfurization system. The system at least comprises a fixed bed desulfurization system and a flue gas switching system, the fixed bed desulfurization system comprises a desulfurization tower, and two desulfurizer filling pipes are arranged in the desulfurization tower side by side; the desulfurizing tower is divided into three cavities by the two desulfurizing agent filling pipes; a partition plate is horizontally arranged in a middle cavity between the two desulfurizing agent filling pipes; an upper communication port and a lower communication port are formed in the wall of the desulfurizing tower corresponding to the upper middle cavity and the lower middle cavity; the two communicating ports are respectively positioned on two opposite sides of the desulfurizing tower; the flue gas switching system comprises a first switching valve, a second switching valve, a third switching valve, a fourth switching valve and an annular flue; according to the invention, fixed bed desulfurization uniform feeding and uniform discharging functions can be realized; the purpose of switching the inlet and outlet of the fixed bed desulfurization tower to ensure full and uniform utilization of upper and lower desulfurizers of the desulfurization tower bed can be achieved, the frequency of replacing the fixed bed desulfurizers is reduced, and the function of replacing the desulfurizers on line can also be achieved.

Description

Technical Field

[0001] The invention relates to a two-way gas inlet and outlet fixed bed desulfurization system. Background Art

[0002] Fixed bed desulfurization technology can perfectly match the working conditions of small flue gas volume and low sulfur concentration flue gas, and is especially suitable for coal gas power generation systems, steel rolling heating furnaces, hot blast furnace systems, etc. in the steel industry. This technology has the following advantages: ① Low temperature drop, dry flue gas after desulfurization, the system does not need corrosion protection, and there is no "white smoke"; ② Desulfurization by-products can be recycled and reused, without secondary pollution; ③ The system is simple, no need for on-duty, easy to inspect and maintain; ④ The system does not generate secondary dust, and no additional dust removal equipment is required; ⑤ The overall resistance of the system is small and the energy consumption is low. However, there are also problems such as the need to regularly replace the desulfurizer, the desulfurizer first contacting the flue gas side fails quickly, and the later contacting the flue gas side fails slowly, resulting in high frequency of desulfurizer replacement and uneven material feeding during replacement. Therefore, a system is urgently needed to solve this problem. Summary of the invention

[0003] In order to overcome the above-mentioned defects, the object of the present invention is to provide a bidirectional inlet and outlet gas fixed bed desulfurization system.

[0004] To achieve the above-mentioned purpose, the bidirectional inlet and outlet fixed bed desulfurization system of the present invention at least comprises a fixed bed desulfurization system and a flue gas switching system;

[0005] The fixed bed desulfurization system comprises a desulfurization tower, in which two desulfurization agent filling pipes are arranged side by side; the two desulfurization agent filling pipes divide the desulfurization tower into three chambers; a partition is horizontally arranged in the middle chamber between the two desulfurization agent filling pipes, and the partition divides the middle chamber into an upper middle chamber and a lower middle chamber; an upper connecting port and a lower connecting port are arranged on the wall of the desulfurization tower corresponding to the upper middle chamber and the lower middle chamber; the two connecting ports are respectively located on opposite sides of the desulfurization tower;

[0006] The flue gas switching system comprises a first switching valve, a second switching valve, a third switching valve, a fourth switching valve and an annular flue; a flue gas inlet is arranged on one side of the annular flue, and a flue gas outlet is arranged on the opposite side of the annular flue; the annular flue is arranged outside the desulfurization tower and connected to two connecting ports, the first switching valve and the second switching valve are arranged in the annular flue on both sides of the upper connecting port; the third switching valve and the fourth switching valve are arranged in the annular flue on both sides of the lower connecting port; wherein,

[0007] When the second switching valve and the third switching valve are in the open state, and the first switching valve and the fourth switching valve are in the closed state, the treated flue gas enters the desulfurization tower through the third switching valve and the lower connecting port, and enters the left and right chambers through the two desulfurizer filling pipes corresponding to the two sides of the lower middle chamber, and is further discharged through the two desulfurizer filling pipes corresponding to the upper middle chamber, the upper connecting port and the second cut-off valve, realizing the function of lower air intake and upper air outlet;

[0008] When the second switching valve and the third switching valve are in the closed state, and the first switching valve and the fourth switching valve are in the open state, the treated flue gas enters the desulfurization tower through the first switching valve and the upper connecting port, and enters the left and right chambers through the two desulfurizer filling pipes corresponding to the two sides of the upper middle chamber, and is further discharged through the two desulfurizer filling pipes corresponding to the lower middle chamber, the lower connecting port and the fourth cut-off valve, realizing the function of upper air intake and lower air outlet.

[0009] Furthermore, a feeding system is provided on the fixed bed desulfurization system; the feeding system comprises a loading bin, a discharge valve, a distribution bin, and a feeding long shaft discharger from top to bottom;

[0010] The upper part of the feeding system's distribution bin is connected to the loading bin through a discharge valve. The distribution bin is centrally fed and the material is evenly divided into two parts through a human-shaped distribution plate. The lower part of the distribution bin is connected to two desulfurizer loading pipes of the fixed bed desulfurization tower through a feeding long-axis discharger.

[0011] Furthermore, a discharge system is provided below the fixed bed desulfurization system, and the discharge system includes a discharge long shaft discharger, a discharge bin, and a discharge valve from top to bottom; wherein,

[0012] The fixed bed desulfurization tower realizes uniform discharge of the desulfurizer to the discharge bin through the discharge long shaft discharger, and finally discharges the ineffective desulfurizer to the outside of the tower through the discharge valve.

[0013] Furthermore, the discharge width of the charging long-axis discharger is consistent with the width of the desulfurizer bed of the fixed-bed desulfurization tower.

[0014] Furthermore, the discharge width of the discharge long-axis discharger is consistent with the width of the desulfurizer bed in the fixed-bed desulfurization tower.

[0015] Furthermore, the discharge valve is a star-shaped discharge valve.

[0016] Furthermore, the discharge valve is a star-shaped discharge valve.

[0017] Furthermore, an induced draft fan is provided at the smoke outlet of the annular smoke duct.

[0018] By adopting the above structure, the present invention can realize the functions of uniform feeding and uniform unloading of fixed bed desulfurization; the inlet and outlet of the fixed bed desulfurization tower can be switched to ensure full and uniform utilization of the desulfurizers in the upper and lower layers of the desulfurization tower bed, reduce the frequency of replacing the fixed bed desulfurizer, and realize the function of online replacement of the desulfurizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic elevation view of the lower air inlet and upper air outlet mode of the system of the present invention;

[0020] Figure 2 It is a schematic plan view of the lower air inlet and upper air outlet mode of the system of the present invention;

[0021] Figure 3 It is a schematic elevation view of the upper air inlet and lower air outlet mode of the system of the present invention;

[0022] Figure 4 It is a schematic plan view of the upper air inlet and lower air outlet mode of the system of the present invention;

[0023] 1. Loading bin; 2. Discharging valve; 3. Distribution bin; 4. Charging long shaft unloading; 5. Desulfurization tower; 5-1. Desulfurization tower inlet and outlet air chamber partitions; 6. Desulfurization agent filling layer; 7. Long shaft unloader; 8. Discharging bin; 9. Discharging valve; 10. induced draft fan; 11-1. Switching valve 1; 11-2. Switching valve 2; 11-3. Switching valve 3; 11-4. Switching valve 4. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0027] like Figure 1As shown, the fixed bed desulfurization tower system is a rectangular structure. The flue gas takes a U-shaped path in the desulfurization tower. The air inlet chamber and the air outlet chamber are arranged in an upper and lower manner and are both in the middle of the desulfurization tower and separated by a partition (5-1). In this mode, the switching valve (11-2) and the switching valve (11-3) are in the open state, and the switching valve (11-1) and the switching valve (11-4) are in the closed state; the fixed bed desulfurization system is a lower air inlet and upper air outlet mode. The fixed bed operating air velocity is not higher than 500h-1; the flue gas empty tower velocity is controlled at 0.35m / s; and the system resistance is not higher than 1.5Kpa. During operation, the inlet and outlet modes of the fixed bed desulfurization tower system can be switched regularly, such as Figure 3 As shown, the switching valve (11-2) and the switching valve (11-3) are in the closed state, the switching valve (11-1) and the switching valve (11-4) are in the open state, and the fixed bed desulfurization system changes to the upper air inlet and lower air outlet mode. After the above mode is changed, the windward side of the desulfurizer in the original mode becomes the leeward side, and the leeward side of the desulfurizer in the original mode becomes the windward side. In the original mode, the bottom of the baffle (5-1) contacts the flue gas first, but in the new mode, the top of the baffle (5-1) contacts the flue gas first. The fixed bed desulfurizer is evenly contacted with the flue gas from front to back and up to down, reacts synchronously, and is deactivated synchronously.

[0028] Compared with the fixed bed desulfurization system, the long-axis feeding and long-axis unloading mode is adopted to achieve uniformity of feeding and unloading in the bed cross section. The unloading valve (2) and the discharge valve (9), the long-axis unloader (4) and the discharge long-axis unloader (7) cooperate to achieve double-layer sealing protection on the feeding side and the discharge side of the fixed bed desulfurization tower.

[0029] When replacing the desulfurizer, the charging bin (1) and the discharging bin (3) can be filled first, and new materials can be added in time during the charging process, and the discharging long-axis discharger (7) can be opened to discharge the materials. The function of discharging and charging at the same time can be realized by the weight of the desulfurizer. Since the width of the charging long-axis discharger (4) and the discharging long-axis discharger (7) is consistent with the width of the desulfurizer bed layer of the fixed bed desulfurization tower, it can ensure that the desulfurizer bed layer that has failed is evenly discharged and new materials are evenly added, without stopping the machine for charging.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0032] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A two-way inlet and outlet fixed bed desulfurization system, characterized in that: At least including a fixed bed desulfurization system and a flue gas switching system; The fixed bed desulfurization system comprises a desulfurization tower, in which two desulfurization agent filling pipes are arranged side by side; the two desulfurization agent filling pipes divide the desulfurization tower into three chambers; A partition is horizontally arranged in the middle cavity between the two desulfurizer loading tubes, and the partition divides the middle cavity into an upper middle cavity and a lower middle cavity; an upper connecting port and a lower connecting port are arranged on the desulfurization tower wall corresponding to the upper middle cavity and the lower middle cavity; the two connecting ports are respectively located on opposite sides of the desulfurization tower; The flue gas switching system comprises a first switching valve, a second switching valve, a third switching valve, a fourth switching valve and an annular flue; a flue gas inlet is arranged on one side of the annular flue, and a flue gas outlet is arranged on the opposite side of the annular flue; the annular flue is arranged outside the desulfurization tower and connected to two connecting ports, the first switching valve and the second switching valve are arranged in the annular flue on both sides of the upper connecting port; the third switching valve and the fourth switching valve are arranged in the annular flue on both sides of the lower connecting port; wherein, When the second switching valve and the third switching valve are in the open state, and the first switching valve and the fourth switching valve are in the closed state, the treated flue gas enters the desulfurization tower through the third switching valve and the lower connecting port, and enters the left and right chambers through the two desulfurizer filling pipes corresponding to the two sides of the lower middle chamber, and is further discharged through the two desulfurizer filling pipes corresponding to the upper middle chamber, the upper connecting port and the second cut-off valve, realizing the function of lower air intake and upper air outlet; When the second switching valve and the third switching valve are in the closed state, and the first switching valve and the fourth switching valve are in the open state, the treated flue gas enters the desulfurization tower through the first switching valve and the upper connecting port, and enters the left and right chambers through the two desulfurizer filling pipes corresponding to the two sides of the upper middle chamber, and is further discharged through the two desulfurizer filling pipes corresponding to the lower middle chamber, the lower connecting port and the fourth cut-off valve, realizing the function of upper air intake and lower air outlet.

2. A two-way inlet and outlet fixed bed desulfurization system according to claim 1, characterized in that: A feeding system is provided on the fixed bed desulfurization system; the feeding system comprises a loading bin, a discharge valve, a distribution bin, and a feeding long shaft discharger from top to bottom; The upper part of the feeding system's distribution bin is connected to the loading bin through a discharge valve. The distribution bin is centrally fed and the material is evenly divided into two parts through a human-shaped distribution plate. The lower part of the distribution bin is connected to two desulfurizer loading pipes of the fixed bed desulfurization tower through a feeding long-axis discharger.

3. A two-way inlet and outlet fixed bed desulfurization system according to claim 1, characterized in that: A discharge system is provided below the fixed bed desulfurization system, and the discharge system includes a discharge long shaft discharger, a discharge bin, and a discharge valve from top to bottom; wherein, The fixed bed desulfurization tower realizes uniform discharge of the desulfurizer to the discharge bin through the discharge long shaft discharger, and finally discharges the ineffective desulfurizer to the outside of the tower through the discharge valve.

4. A two-way inlet and outlet fixed bed desulfurization system according to claim 2, characterized in that: The discharge width of the charging long-axis discharger is consistent with the width of the desulfurizer bed of the fixed-bed desulfurization tower.

5. A two-way inlet and outlet fixed bed desulfurization system according to claim 3, characterized in that: The discharge width of the discharge long-axis discharger is consistent with the width of the desulfurizer bed in the fixed-bed desulfurization tower.

6. A two-way inlet and outlet fixed bed desulfurization system according to claim 2, characterized in that: The discharge valve is a star-shaped discharge valve.

7. A two-way inlet and outlet fixed bed desulfurization system according to claim 3, characterized in that: The discharge valve is a star-shaped discharge valve.

8. According to the bidirectional inlet and outlet fixed bed desulfurization system of claim 1, it is characterized in that: An induced draft fan is arranged at the smoke outlet of the annular flue.

Images