Sedimentation prevention device for slurry in desulfurizing tower

Abstract

The invention provides an anti-settling device for slurry in a desulfurizing tower, which mainly comprises an annular converging pipe, a supporting system, a flushing system, a thickness measuring device and a flushing system, and is characterized in that the annular converging pipe is connected with an outlet of a desulfurizing slurry circulating pump, and ejectors are uniformly distributed at a certain angle along the axial direction and the radial direction of the desulfurizing tower; the automatic flushing system is located on the upper portion of the annular converging pipe, the thickness measuring device is interlocked with pneumatic valves of the ejectors, and automatic flushing is conducted according to the thickness of the bottom of the annular converging pipe. Energy of slurry at an outlet of the desulfurization slurry circulating pump is utilized to uniformly and continuously disturb a dead angle area where the slurry at the lower part of the desulfurization tower is easy to deposit, slurry deposition and scaling can be effectively prevented, and the device can replace a side stirrer consuming electric energy, is energy-saving and environment-friendly, and meanwhile, the inner wall of the device is cleaned by utilizing outlet pressure of a process water pump; and in the long-term operation process, the energy-saving effect is more obvious.

Description

Technical Field

[0001] The invention relates to the field of flue gas desulfurization, and in particular to a device for preventing precipitation of circulating slurry inside a desulfurization tower in a wet desulfurization process system. Background Art

[0002] At present, in the wet flue gas desulfurization process system, the slurry in the desulfurization tower is generally disturbed by an electric agitator to prevent the slurry from settling and solidifying. However, in actual application, the disturbance capacity of the electric agitator is limited. The number is also certain according to the diameter of the desulfurization tower, and generally 3 to 5 are set. The slurry disturbance only has a significant effect on the slurry in the middle part of the tower. There is an obvious dead angle in the connection area between the tower wall and the bottom plate of the desulfurization tower. The solidified slurry volume increases geometrically after long-term operation, and the effective volume of the circulating slurry decreases. In severe cases, it affects the slurry circulation volume, thereby affecting the desulfurization efficiency. After solidification, the main component of the slurry is a mixture of gypsum and dust, which is extremely strong and difficult to clean during the maintenance of the desulfurization system. On the other hand, the electric agitator needs to run stably with the operation of the desulfurization system, consuming electricity. In addition, there is a slurry leakage problem during the use of the electric agitator, and the maintenance cost is high. Finally, the desulfurization device is highly corrosive, and the electric agitator will have more or less corrosion problems during long-term use. The material requirements of the part of the electric agitator that comes into contact with the slurry are high, generally made of 2507 stainless steel, and it needs to be replaced after long-term operation, which affects the overall stable operation of the desulfurization system.

[0003] In summary, how to solve the problem of precipitation and solidification of circulating slurry is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] The present invention overcomes the deficiencies of the above technologies, utilizes the outlet main pipe pressure of the circulation pump, does not affect the desulfurization efficiency, and provides a slurry anti-sedimentation device which is more convenient and quick to construct, more energy-saving to use, and more effective.

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

[0006] A slurry anti-sedimentation device in a desulfurization tower, comprising:

[0007] The annular confluence pipe is made of FRP fiberglass, with reserved holes for the connection with the ejector and flushing system. The main body is formed in one step, which is beautiful, practical and corrosion-resistant.

[0008] The ejector is made of FRP fiberglass, formed in one step, beautiful, practical, corrosion-resistant, and the reserved hole for the annular confluence pipe is made of reinforced FRP fiberglass paste. A flange-type sealing cover is set at the end of the ejector for easy disassembly and maintenance;

[0009] The support system is made of carbon steel, which is firmly welded to the wall of the desulfurization tower, and the outer surface is made of FRP for corrosion protection;

[0010] The flushing system is made of carbon steel, and the connection part with the annular confluence pipe is made of FRP fiberglass as an anti-corrosion transition;

[0011] The thickness measuring device is made of 304 stainless steel, and is protected by a fiberglass protective cover to prevent corrosion from acidic gases in the atmosphere. It is easy to disassemble and maintain.

[0012] The high-efficiency nozzle is made of silicon carbide. Four high-efficiency nozzles are set at the end of each injector. The angle γ between the two high-efficiency nozzles in the vertical direction ranges from 20 to 50°, and the angle δ between the two high-efficiency nozzles in the horizontal direction ranges from 20 to 90°.

[0013] The connecting valves between the devices are lined with rubber butterfly valves and pneumatically controlled. The valves are interlocked with the thickness measuring device. According to the thickness value measured by the thickness measuring device, the pneumatic valve opens automatically to flush the pipeline. The mixed slurry after flushing enters the desulfurization tower and can be used as another way to replenish water for the desulfurization tower, thereby improving the water balance stability of the desulfurization system.

[0014] Preferably, in the above-mentioned anti-sedimentation device, the radial angle α between the ejector and the desulfurization tower is in the range of 5 to 10°, and the axial angle β is in the range of 5 to 10°;

[0015] Preferably, in the above anti-sedimentation device, the four high-efficiency nozzles are grouped together and fixed at the end of the ejector at a certain angle: the vertical angle of the two high-efficiency nozzles is γ, ranging from 20 to 50°; the horizontal angle of the two high-efficiency nozzles is δ, ranging from 20 to 90°. The connection method is flange connection, which is easy to disassemble and replace. The high-efficiency nozzle is made of silicon carbide, and the internal channel is spiral to increase the disturbance capacity;

[0016] Preferably, in the above-mentioned anti-sedimentation device, an even number of ejectors are provided according to the diameter of the desulfurization tower, and are arranged symmetrically with respect to each other basically along the longitudinal and transverse center lines of the desulfurization tower. Such an arrangement has the best effect.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention draws part of the slurry from the outlet pipe of the circulating pump to spray the slurry at the bottom of the desulfurization tower, and uses the pressure of the circulating pump outlet to form a stable disturbance in the dead corner area at the bottom of the desulfurization tower, so that the slurry in the desulfurization tower, especially the slurry in the circumferential easy sedimentation area of ​​the tower wall and the bottom plate, can be in a suspended state, and the slurry chaos increases without precipitation;

[0019] 2. The automatic flushing device of the present invention can not only automatically flush the device, which is convenient and fast, and is easy to operate and manage, but can also be used as water replenishment for the desulfurization tower, which is more beneficial to the water balance adjustment of the entire desulfurization system;

[0020] 3. The present invention does not require consumption of additional electric energy and is more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the planar structure of the present invention;

[0022] Figure 2 It is a first partial cross-sectional view (AA) of the present invention;

[0023] Figure 3 It is a second partial cross-sectional view (BB) of the present invention;

[0024] Figure 4 A cross-sectional view of a high-efficiency nozzle of the present invention;

[0025] Figure 5 A top view of a high-efficiency nozzle of the present invention;

[0026] Figure 6 It is the detailed diagram "Ⅰ" of the present invention.

[0027] Figure markings: 1-circulating pump outlet pneumatic valve, 2-annular junction pipe, 3-injector pneumatic valve, 4-injector, 5-injector mounting flange, 6-injector mounting sleeve, 7-support system, 8-flushing system, 9-high-efficiency nozzle, 10-thickness measuring device, 11-flushing system pneumatic valve, 12-circulating slurry pump outlet pipe, 13-desulfurization tower, 14-desulfurization tower side wall, 15-desulfurization tower bottom plate, 16-process water pump outlet pipe, 17-process water pump outlet pneumatic valve. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “center”, “side”, “bottom”, “axial”, “longitudinal”, “transverse”, “radial” and “circumferential” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply 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.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. 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] See also Figure 1-5 A device for preventing slurry from settling in a desulfurization tower comprises an annular confluence pipe 2, an ejector 4, a supporting system 7, a high-efficiency nozzle 9, and a thickness measuring device 10. The annular confluence pipe and the ejector are connected via an ejector mounting flange 5. The ejector and the desulfurization tower wall are fixed via an ejector mounting sleeve 6. The circulating pump outlet pneumatic valve 1 is used to cut off the device from the circulating pump outlet pipeline. The ejector pneumatic valve 3 is used to cut off the ejector from the annular confluence pipe. The flushing system 8 is arranged on the upper part of the annular confluence pipe. The thickness measuring device 10 and the flushing system are set with interlocking conditions. When the sediment in the annular confluence pipe reaches a certain thickness, the flushing system is opened to flush the entire device, and the flushing slurry flows back into the desulfurization tower by gravity.

[0032] Specifically, when the circulating pump outlet pneumatic valve 1 is in the open state, the interlocking relationship between the thickness measuring device 10 and the pneumatic valve of the ejector 4 can be enabled only when it reaches the set parameters. In other words, the circulating pump outlet pneumatic valve also has an interlocking relationship with the thickness measuring device and the pneumatic valve of the ejector.

[0033] Specifically, four high-efficiency nozzles 9 are configured at the end of each injector 4, with an axial angle γ in the vertical direction of the injector 4 ranging from 10 to 30°, and an axial angle δ in the horizontal direction of the injector 4 ranging from 10 to 45°, forming a water flow with high impact force, which can produce effective and continuous disturbance to the slurry.

[0034] Specifically, the purpose of the ejector 4 is to disturb the slurry at the bottom of the desulfurization tower, thereby effectively avoiding dead corners and sedimentation in the desulfurization tower.

[0035] Specifically, three thickness measuring devices are set at the bottom of the annular confluence pipe. The thickness measuring device 10 is interlocked with the pneumatic valve of the flushing device 8. Flushing is performed according to the deposition thickness of the slurry at the bottom of the annular confluence pipe 2 to ensure the long-term stable operation of the flushing device. When the thickness of the slurry sediment in the pipe reaches 50mm, the pneumatic valve of the flushing system is opened and closed after 5s, and this is repeated.

[0036] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A slurry precipitation prevention device in a desulfurization tower, comprising a circulating pump outlet pneumatic valve, an annular confluence pipe, an ejector pneumatic valve, an ejector, an ejector mounting flange, an ejector mounting sleeve, a support system, a flushing system, a high-efficiency nozzle, a thickness measuring device, a flushing system pneumatic valve, a circulating slurry pump outlet pipeline, a desulfurization tower, a desulfurization tower side wall, a desulfurization tower bottom plate, a process water pump outlet pipeline, and a process water pump outlet pneumatic valve, characterized in that: The annular confluence pipe is connected to the outlet of the desulfurization slurry circulation pump, the ejector is arranged in an annular direction along the outer wall of the desulfurization tower, 6 holes are opened on the side wall of the desulfurization tower when the ejector is installed (the number is adjustable according to the diameter of the desulfurization tower to ensure that the straight-line distance of the ejector is not less than 3.5m), the end of the ejector is inserted into the desulfurization tower, the radial angle α of the desulfurization tower is in the range of 5 to 10°, and the axial angle β is in the range of 5 to 10°. The ejector takes the form of a socket sleeve, the flushing system is located on the upper part of the annular confluence pipe, the pneumatic valve of the flushing system is connected to the outlet main pipe of the process water pump, the high-efficiency nozzle is connected to the end of the ejector through a flange, the ejector and the flushing system are both provided with a pneumatic valve, the thickness measuring device is located at the bottom of the annular confluence pipe, and the support system of the device is fixed to the side wall of the desulfurization tower.

2. The device for preventing slurry from settling in a desulfurization tower according to claim 1, characterized in that: The annular confluence pipe is connected to the outlet pipe of the slurry circulation pump, and a pneumatic valve is arranged therebetween for effective cutting off.

3. The device for preventing slurry from settling in a desulfurization tower according to claim 1, characterized in that: A flange type sealing cover is arranged at the end of the injector to facilitate disassembly and maintenance.

4. The device for preventing slurry from settling in a desulfurization tower according to claim 1, characterized in that: The high-efficiency nozzle is connected to the sealing cover flange at the end of the injector. Four high-efficiency nozzles are arranged at the end of each injector. The angle γ between two high-efficiency nozzles in the vertical direction ranges from 20 to 50 degrees, and the angle δ between two high-efficiency nozzles in the horizontal direction ranges from 20 to 90 degrees.

5. The device for preventing slurry from settling in a desulfurization tower according to claim 1, characterized in that: The supporting system is fixed on the outer wall of the desulfurization tower.

6. The device for preventing slurry from settling in a desulfurization tower according to claim 1, characterized in that: Three thickness measuring devices are set at the bottom of the annular confluence pipe. The thickness measuring device is interlocked with the pneumatic valve of the flushing system. When the measured thickness of the slurry sediment in the pipe reaches 50mm, the pneumatic valve of the flushing system opens and closes after 5s, and this process is repeated.

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