A flue gas treatment system based on slurry cooling cycle

Abstract

The present invention provides a flue gas treatment system based on slurry cooling cycle, wherein a desulfurization tower is provided with a slurry spraying mechanism; a heat exchange unit in a slurry cooler housing includes a plurality of heat exchange plates arranged at intervals, a slurry circulation pump drives the slurry in the desulfurization tower to reflux, and the slurry flows through the intervals between the heat exchange plates and is cooled by heat exchange, and then is transported to the slurry spraying mechanism; a radiator is arranged outside the slurry cooler and is circulatedly connected with a plurality of heat exchange plates through a coolant circulation pump, and the coolant absorbs the heat of the slurry at each heat exchange plate and cools and dissipates the heat at the radiator; and a cooling cycle controller, a desulfurization tower, and a slurry cooler control the primary cooling cycle of the slurry between the desulfurization tower and the slurry cooler, and controls the secondary cooling cycle of the coolant between the slurry cooler and the radiator. The slurry cooling cycle is smooth, and the slurry cooling temperature can be stably adjusted, effectively eliminating smoke plumes, and eliminating soluble salts and dust in flue gas.

Description

Technical Field

[0001] The invention relates to the technical field of environmentally friendly flue gas treatment, and in particular provides a flue gas treatment system based on slurry cooling cycle. Background Art

[0002] When the flue gas generated by the combustion equipment in thermal power plants, chemical plants, etc. is discharged into the atmosphere, the temperature drops and some of the vapor water and pollutants in the flue gas condense, forming misty water vapor at the chimney mouth, forming a colored smoke plume, usually white, grayish white or blue.

[0003] After a lot of practice, it was found that the use of flue gas reheating to control the smoke plume, that is, heating and dehumidifying the saturated flue gas at the outlet of the desulfurization tower to reduce the smoke plume, mainly eliminates visual pollution, but has a poor effect on eliminating soluble salts and dust in the flue gas.

[0004] In contrast, the method of using limestone slurry to cool and desulfurize flue gas can greatly reduce soluble salts and dust. In the process of using limestone slurry for flue gas cooling and desulfurization, the limestone slurry is used for flue gas desulfurization absorption. However, in the current desulfurization process using limestone slurry, the cooling slurry is generally cooled and dissipated naturally in the air. The equipment occupies a large area, and it is difficult to cool the cooling slurry in a short time. The temperature regulation of the cooling slurry cannot be accurately controlled, so that the excessively high cooling slurry temperature is circulated into the desulfurization tower again, which not only has a poor cooling effect on the flue gas, but also the generated water vapor cannot be converted into condensed water, making it difficult to effectively eliminate the smoke plume. In addition, there are also some that use clean water coolers for slurry cooling circulation, but the internal flow channels of the commonly used clean water coolers are tortuous and narrow, and the limestone slurry is easily blocked and deposited when flowing inside, resulting in poor cooling effect. At the same time, there are problems such as difficulty in temperature regulation, and it cannot be effectively applied to the limestone slurry cooling process of the flue gas desulfurization process. Summary of the invention

[0005] Based on this, the present invention provides a flue gas treatment system based on a slurry cooling cycle, which enables the limestone slurry to flow smoothly during the cooling process and avoids deposition problems. It can also automatically adjust the slurry cooling temperature according to process requirements to meet the needs of the flue gas desulfurization process, so as to effectively eliminate smoke plumes and soluble salts and dust in the flue gas.

[0006] In order to achieve the above object, the present invention provides a flue gas treatment system based on slurry cooling cycle, including a desulfurization tower, a slurry cooler, a radiator and a cooling cycle controller. The system is constructed as follows: the desulfurization tower is provided with a slurry spraying mechanism.

[0007] A heat exchange unit is arranged in the shell of the slurry cooler, and the heat exchange unit includes a plurality of heat exchange plates arranged at intervals. A slurry circulation pump is connected between the bottom of the desulfurization tower and the input end of the slurry cooler, and the output end of the slurry cooler is connected to the slurry spraying mechanism;

[0008] The radiator is arranged outside the slurry cooler and is circulatedly connected with the plurality of heat exchange plates through a coolant circulation pump, and the coolant absorbs the heat of the slurry at each of the heat exchange plates and cools and dissipates the heat at the radiator. A cooling circulation controller is electrically connected to the desulfurization tower, the slurry cooler and the radiator, and is configured to control the primary cooling circulation of the slurry between the desulfurization tower and the slurry cooler, and to control the secondary cooling circulation of the coolant between the slurry cooler and the radiator.

[0009] Furthermore, the slurry cooler is provided with a vertically arranged conical slurry channel, the heat exchange unit is movably arranged in the conical slurry channel, a plurality of the heat exchange plates are arranged at intervals in the lateral direction, the slurry cooler is provided with an adjusting mechanism drivingly connected to the heat exchange unit, the cooling cycle controller is electrically connected to the adjusting mechanism, and is configured to control the adjusting mechanism to drive the heat exchange unit to move vertically in the conical channel to change the ratio of the heat exchange body to the cross-sectional area of ​​the variable diameter channel.

[0010] Furthermore, a slurry temperature monitor is provided at the outlet end of the slurry cooler, and the cooling cycle controller is electrically connected to the slurry temperature monitor and is configured to receive the slurry temperature monitoring value and compare it with the set value. When the slurry temperature monitoring value is higher than the set value, the regulating mechanism is controlled to drive the heat exchange unit to move toward the small opening end of the conical slurry channel to increase the ratio of the cross-sectional area of ​​the variable diameter channel occupied by the heat exchange plate body.

[0011] Furthermore, each heat exchange plate of the heat exchange unit is connected in parallel with the radiator, and a plurality of liquid flow channels are arranged in an array inside the heat conductive shell of the heat exchange plate. A coolant circulation pump drives the low-temperature coolant in the radiator to flow through the liquid flow channels in each of the heat conductive shells, and the high-temperature slurry flowing outside the heat conductive shell exchanges heat with the coolant in the heat conductive shell to reduce the temperature.

[0012] Furthermore, a coolant temperature monitor is provided at the outlet end of the heat exchange unit, and the cooling cycle controller is electrically connected to the coolant temperature monitor. The cooling cycle controller is configured to receive a coolant temperature monitoring value and compare it with a set value. When the coolant temperature monitoring value is higher than the set value, the regulating mechanism is controlled to drive the heat exchange unit to move toward the small opening end of the tapered slurry channel to increase the ratio of the cross-sectional area of ​​the variable diameter channel occupied by the heat exchange plate body.

[0013] Furthermore, a flue gas temperature monitor is provided at the outlet end of the desulfurization tower, and the cooling cycle controller is electrically connected to the flue gas temperature monitor. The cooling cycle controller is configured to receive the flue gas temperature monitoring value and compare it with the set value. When the flue gas temperature monitoring value is higher than the set value, the regulating mechanism is controlled to drive the heat exchange unit to move toward the small opening end of the conical slurry channel to increase the ratio of the cross-sectional area of ​​the variable diameter channel occupied by the heat exchange plate.

[0014] Furthermore, inclined guide rails are symmetrically arranged along both sides of the inner wall of the conical slurry channel, and the upper ends of the inclined guide rails on both sides are arranged with a large spacing and a small spacing at the lower ends. The outermost heat exchange plate body of the heat exchange unit is provided with an inclined guide block that slides with the inclined guide rails. A bearing frame and an adjusting rod are provided between the adjusting mechanism and each heat exchange plate body. The bearing frame is provided with a horizontal guide rail. The upper end of each heat exchange plate body is connected to a bearing wheel that slides with the horizontal guide rail. The adjusting rod is connected between the adjusting mechanism and the bearing frame. During the process of the adjusting mechanism driving the heat exchange plate body to rise and fall, the heat exchange plate body is driven to slide along the horizontal guide rail and move closer to the middle through the sliding cooperation between the inclined guide block and the inclined guide rail, and the interval distance between adjacent heat exchange plate bodies becomes smaller.

[0015] Furthermore, each of the heat exchange plates is arranged at equal intervals and is connected to a transverse scissor-type connecting rod mechanism on the outside. During the process of the adjustment mechanism driving the heat exchange unit to vertically lift and lower in the conical slurry channel, each of the heat exchange plates is constrained by the scissor-type connecting rod mechanism and adjusted at equal intervals.

[0016] Furthermore, the scissor-type connecting rod mechanism includes multiple groups of first connecting rods and second connecting rods of equal length and hinged in the middle, and each first connecting rod and second connecting rod are respectively connected between adjacent heat exchange plates: one end of the first connecting rod is hinged to the upper end of the left heat exchange plate, and the other end is connected to the lower end of the right heat exchange plate; one end of the second connecting rod is hinged to the lower end of the left heat exchange plate, and the other end is hinged to the upper end of the right heat exchange plate.

[0017] Furthermore, a wedge-shaped liquid flow channel is provided in the inclined guide block, a wedge-shaped plug body is provided in the wedge-shaped liquid flow channel, and the inclined guide block is provided with an adjusting cylinder drivingly connected to the wedge-shaped plug body. The slurry flow rate monitor is control-connected to the adjusting cylinder and is configured to control the movement of the wedge-shaped plug body in the wedge-shaped liquid flow channel through the adjusting cylinder to achieve flow area adjustment of the wedge-shaped liquid flow channel to compensate for the change in flow area caused by the adjustment of the spacing between the heat exchange plates.

[0018] Compared with the prior art method of cooling limestone slurry naturally in the air or using an existing clean water cooler for cooling, the technical advantages of the flue gas treatment system based on slurry cooling cycle provided by the present invention are at least reflected in the following aspects:

[0019] 1. A slurry cooler connected to the desulfurization tower circulation is provided to perform primary cooling of the limestone slurry used for flue gas desulfurization cooling in the desulfurization tower, and a radiator connected to the slurry cooler circulation is provided to perform secondary cooling of the coolant used for slurry heat dissipation cooling. The cooling cycle controller controls the two-stage cooling at the same time to achieve precise control of the slurry cooling temperature in the desulfurization process. The equipment occupies a small area and has high heat exchange efficiency.

[0020] 2. The slurry temperature is precisely controlled by the slurry cooler. In the desulfurization tower, part of the water in the slurry evaporates to generate water vapor, making the flue gas saturated. Further spraying of low-temperature slurry converts the water vapor into liquid and condenses water, thereby reducing the humidity and plume of the flue gas. At the same time, the soluble salt and dust requirements in the flue gas are effectively removed, and the desulfurization water replenishment is reduced, effectively reducing the desulfurization and cooling costs.

[0021] 3. By arranging multiple heat exchange plates in the heat exchange unit in the slurry cooler, the reflux slurry in the desulfurization tower flows through the intervals between the heat exchange plates and is cooled by heat exchange, which not only keeps the slurry flowing smoothly and avoids blockage and deposition problems, but also ensures uniform heat exchange and high heat transfer efficiency.

[0022] 4. Each heat exchange plate is movably installed in the conical slurry channel and connected by a scissor-type connecting rod mechanism. The outer movable plate slides with the inclined surface of the conical slurry channel. By driving each movable plate to move along the inclined surface in the conical slurry channel, the equal spacing adjustment of each heat exchange plate is achieved, and the fluid in the gap of each heat exchange plate changes by the same amount, so as to achieve rapid and uniform adjustment of the slurry cooling temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute a part of the specification, describe embodiments of the present invention and, together with the specification, are used to explain the principles of the present invention. With reference to the accompanying drawings, the present invention can be more clearly understood according to the following detailed description, in which:

[0024] Figure 1 is a schematic diagram of a smoke treatment system based on a slurry cooling cycle provided in an embodiment;

[0025] Figure 2 Schematic diagram of the structure of the embodiment of the provided slurry cooler (part of the shell is removed)

[0026] Figure 3 is a schematic diagram of the structure of an embodiment of the provided slurry cooler housing;

[0027] Figure 4 is a schematic diagram of the structure of an embodiment of a heat exchange unit of a slurry cooler provided;

[0028] Figure 5This is a schematic diagram of the structure of a single heat exchanger of the provided slurry cooler (part of the heat exchange shell is removed)

[0029] Figure 6 It is a structural schematic diagram of the connection between the heat exchange unit of the provided slurry cooler and the radiator;

[0030] Figure 7 It is a schematic diagram of a state in which a heat exchange unit of the provided slurry cooler is moved and adjusted to a large opening end of a tapered slurry channel;

[0031] Figure 8 yes Figure 7 Schematic diagram of the cross section at AA;

[0032] Fig. 9 It is a schematic diagram of a state in which a heat exchange unit of the provided slurry cooler is moved and adjusted to the large and small opening ends of the tapered slurry channel;

[0033] Fig.10 yes Figure 7 Schematic diagram of the cross section at CC;

[0034] Fig.11 The invention is a structural schematic diagram of an inclined guide block provided with a wedge-shaped liquid flow channel with adjustable flow area.

[0035] Description of the accompanying drawings:

[0036] 1. Desulfurization tower; 11. Flue gas input end; 12. Flue gas output end; 13. Slurry spraying mechanism; 14. Defogging area; 15. Flue gas temperature monitor;

[0037] 2. Slurry cooler;

[0038] 201, housing; 202, slurry input end; 203, slurry output end; 204, adjustment mechanism; 205, inclined guide rail; 206, slurry temperature monitor;

[0039] 211, heat exchange plate body; 212, oblique guide block; 213, soft liquid inlet pipe; 214-soft liquid return pipe; 215, scissor-type connecting rod mechanism; 216, load-bearing wheel; 217, load-bearing frame; 218, adjusting rod; 219, wedge-shaped liquid flow channel; 220, wedge-shaped plug body; 221, adjusting cylinder;

[0040] 3. Slurry circulation pump;

[0041] 4. Radiator; 41. Coolant circulation pump; 42. Cooling fan; 43. Coolant temperature monitor;

[0042] 5. Cooling cycle controller.

[0043] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0044] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments herein. In the present invention, when a particular device is described as being between a first device and a second device, there may or may not be an intervening device between the particular device and the first device or the second device.

[0045] Embodiment 1:

[0046] like Figures 1 to 10 As shown, the present invention provides a flue gas treatment system based on a slurry cooling cycle, comprising a desulfurization tower 1, a slurry cooler 2, a radiator 4 and a cooling cycle controller 5.

[0047] A flue gas input end 11 is provided at the bottom of the desulfurization tower 1, and a flue gas output end 12 is provided at the top. A slurry spraying mechanism 13 is provided in the flue gas channel between the flue gas input end 11 and the flue gas output end 12. The slurry spraying mechanism 13 includes a plurality of slurry spraying heads, and a mist elimination area 14 is provided above the slurry spraying mechanism 13.

[0048] The slurry cooler 2 is arranged outside the desulfurization tower 1, and a heat exchange unit is arranged in the shell 201. The slurry input end 202 is connected to the bottom of the desulfurization tower 1 through a slurry circulation pump 3, and is used to input the slurry collected in the desulfurization tower; the slurry output end 203 is connected to the slurry spray head of the slurry spray mechanism 13 through another slurry circulation pump 3, and is used to transport the cooled slurry to the slurry spray head, spray the slurry in the desulfurization tower, and desulfurize and cool the flue gas passing through the inside of the desulfurization tower.

[0049] The heat exchange unit includes a plurality of heat exchange plates 211 arranged at intervals. The slurry circulation pump 3 drives the slurry in the desulfurization tower 1 to reflux, and the slurry flows through the intervals between the heat exchange plates 211 and is cooled by heat exchange, and then transported to the slurry spraying mechanism 13 .

[0050] The radiator 4 is arranged outside the slurry cooler 2 and is circulatedly connected to the plurality of heat exchange plates 211 through a coolant circulation pump 41 . The coolant absorbs the heat of the slurry at each of the heat exchange plates 211 and is cooled and dissipated at the radiator 4 .

[0051] The cooling cycle controller 5 is electrically connected to the desulfurization tower 1, the slurry cooler 2 and the radiator 4, and is configured to control the primary cooling cycle of the slurry between the desulfurization tower 1 and the slurry cooler 2, and to control the secondary cooling cycle of the coolant between the slurry cooler 2 and the radiator 4. In the implementation process, the cooling cycle controller 5 can be an existing automatic control device such as an industrial computer, a PLC programmable controller, an intelligent control device, etc.

[0052] Working principle of a flue gas treatment system based on a slurry cooling cycle is provided:

[0053] Primary cooling cycle: the limestone slurry is cooled in the slurry cooler 2, and the cooled slurry is driven by the slurry circulation pump 3 to be transported from the slurry output end 203 to the slurry spraying mechanism 13, and sprayed into the desulfurization tower by the slurry spray head to cool the passing flue gas. The slurry temperature is accurately controlled by the slurry cooler 2. In the desulfurization tower 1, part of the water in the slurry evaporates to generate water vapor, making the flue gas enter a saturated state. Further spraying of low-temperature slurry converts the water vapor into liquid and precipitates condensed water, thereby reducing the humidity and plume of the flue gas, and effectively removing the soluble salt and dust requirements in the flue gas, and reducing the desulfurization water replenishment, effectively reducing the desulfurization cooling cost. The sprayed slurry is collected at the bottom of the desulfurization tower, and another slurry circulation pump 3 is used to transport the collected slurry from the slurry input end 202 to the slurry cooler 2, where it is cooled again and recycled.

[0054] Secondary cooling cycle: The coolant circulation pump 41 drives the coolant to flow through each heat exchange body 211 in the slurry cooler 2, and exchanges heat with the slurry flowing outside each heat exchange body 211. The heat absorption temperature of the coolant increases, and the heat dissipation temperature of the slurry decreases. Then, the coolant circulation pump 41 drives the coolant to be transported to the external radiator 4. The radiator 4 dissipates heat in the air. A cooling fan 42 is provided outside the radiator 4 to flow air outside the radiator to improve the heat dissipation efficiency. The coolant can be water or a liquid medium of other materials. In the slurry cooler 2, the limestone slurry flows outside the heat exchange plate body, and the coolant flows inside the heat exchange plate body. The heat exchange plate body is a shell structure, and the limestone slurry and the coolant are isolated from each other and will not be mixed.

[0055] Based on the above two-stage cooling cycle process, the limestone slurry used for flue gas desulfurization cooling in the desulfurization tower is cooled at the primary level, and a radiator cyclically connected to the slurry cooler is provided to perform secondary cooling of the coolant used for slurry heat dissipation cooling. The cooling cycle controller controls the two-stage cooling at the same time to achieve precise control of the slurry cooling temperature of the desulfurization process, which is suitable for situations where the desulfurization cooling conditions of the flue gas vary greatly.

[0056] Embodiment 2:

[0057] The limestone slurry contains some particles and is easy to settle. In the implementation process, in order to adapt to the flow of the limestone slurry and facilitate adjustment and control, the structure of the slurry cooler 2 is as follows:

[0058] like Figures 2 to 6 As shown, the slurry cooler 2 is provided with a vertically arranged conical slurry channel, the heat exchange unit is movably arranged in the conical slurry channel, a plurality of the heat exchange plates 211 are arranged at intervals in the lateral direction, the slurry cooler 2 is provided with an adjusting mechanism 204 drivingly connected to the heat exchange unit, the cooling cycle controller 5 is electrically connected to the adjusting mechanism 204, and is configured to control the adjusting mechanism 204 to drive the heat exchange unit to move vertically in the conical channel to change the ratio of the heat exchange body to the cross-sectional area of ​​the variable diameter channel.

[0059] In some implementations, each heat exchange plate 211 of the heat exchange unit is connected in parallel with the radiator 4, and a plurality of liquid flow channels are arranged in the array inside the heat-conducting shell of the heat exchange plate 211. The coolant circulation pump 41 drives the low-temperature coolant in the radiator 4 to flow through the liquid flow channels inside the heat-conducting shell, and the high-temperature slurry flowing outside the heat-conducting shell exchanges heat with the coolant inside the heat-conducting shell to reduce the temperature. Preferably, the shell of the heat exchange plate 211 is a rectangular parallelepiped structure with a smooth surface to reduce flow resistance and avoid the deposition and clogging of limestone slurry outside the heat exchanger 211.

[0060] By setting a heat exchange unit in the slurry cooler 2 and arranging multiple heat exchange plates 211 at intervals, the reflux slurry in the desulfurization tower 1 flows through the intervals between the heat exchange plates and is cooled by heat exchange. This not only keeps the slurry flowing smoothly and avoids blockage and deposition problems, but also has high heat transfer efficiency and small volume, and can quickly and stably adjust the slurry cooling temperature by adjusting the temperature of the heat exchange plates.

[0061] As shown in the figure, in the implementation process, temperature monitoring is performed by adding temperature monitors at different positions of the system, and the temperature monitored by the temperature monitor is received by the cooling cycle controller 5, and compared with the temperature value set in the cooling cycle controller 5. When the temperature exceeds the set value range, the cooling cycle controller 5 controls the heat exchange unit to operate. Specifically:

[0062] like Figure 2 , Figure 3 , Figures 7 to 10As shown, in some preferred embodiments, the outlet end of the slurry cooler 2 is provided with a slurry temperature monitor 206, and the cooling cycle controller 5 is electrically connected to the slurry temperature monitor 206, and is configured to receive the slurry temperature monitoring value and compare it with the set value. When the slurry temperature monitoring value is higher than the set value, the regulating mechanism 204 is controlled to drive the heat exchange unit to move toward the small opening end of the tapered slurry channel to increase the ratio of the cross-sectional area of ​​the heat exchange plate 211 to the cross-sectional area of ​​the variable diameter channel. Under the condition that the slurry flow velocity on the surface of the heat exchange plate 211 is constant, the area of ​​the heat exchange plate 211 is relatively increased, thereby increasing the cooling speed of the slurry, so that the slurry temperature is reduced until the slurry temperature reaches the set value. On the contrary, the heat exchange unit is driven to move toward the large opening end of the tapered slurry channel to reduce the cooling speed of the slurry.

[0063] like Figure 2 , Figure 3 , Figures 6 to 10 As shown, in some other preferred embodiments, the outlet end of the heat exchange unit is provided with a coolant temperature monitor 43, the cooling cycle controller 5 is electrically connected to the coolant temperature monitor 43, and the cooling cycle controller 5 is configured to receive the coolant temperature monitoring value and compare it with the set value. When the coolant temperature monitoring value is higher than the set value, the regulating mechanism 204 is controlled to drive the heat exchange unit to move toward the small opening end of the tapered slurry channel to increase the ratio of the cross-sectional area of ​​the heat exchange plate 211 to the variable diameter channel. Under the condition that the slurry flow velocity on the surface of the heat exchange plate 211 is constant, the area of ​​the heat exchange plate 211 is relatively increased, thereby increasing the cooling speed of the slurry, so that the slurry temperature is reduced until the slurry temperature reaches the set value. The reverse is also true.

[0064] like Figure 1 , Figure 2 , Figure 3 , Figures 7 to 10 As shown, in other preferred embodiments, a flue gas temperature monitor 15 is provided at the outlet end of the desulfurization tower 1, and the cooling cycle controller 5 is electrically connected to the flue gas temperature monitor 15. The cooling cycle controller 5 is configured to receive the flue gas temperature monitoring value and compare it with the set value. When the flue gas temperature monitoring value is higher than the set value, the regulating mechanism 204 is controlled to drive the heat exchange unit to move toward the small opening end of the conical slurry channel to increase the ratio of the cross-sectional area of ​​the variable diameter channel occupied by the heat exchange plate body 211, which is the same as the above-mentioned regulating principle.

[0065] Embodiment three:

[0066] like Figures 2 to 5As shown, on the basis of the second embodiment, the structure is optimized. Specifically, inclined guide rails 205 are symmetrically arranged along the inner wall of the conical slurry channel on both sides. The inclined guide rails 205 on both sides are arranged with a large spacing at the upper ends and a small spacing at the lower ends. The outermost heat exchange plate body 211 of the heat exchange unit is provided with an inclined guide block 212 that slides with the inclined guide rail 205. A bearing frame 217 and an adjusting rod 218 are provided between the adjusting mechanism 204 and each heat exchange plate body 211. The bearing frame 217 is provided with a horizontal guide rail. A bearing wheel 216 that slides with the horizontal guide rail is connected to the upper end of each heat exchange plate body 211. The adjusting rod 218 is connected between the adjusting mechanism 204 and the bearing frame 217. During the process of the adjusting mechanism 204 driving the heat exchange plate body 211 to rise and fall, the heat exchange plate body 211 is driven to slide along the horizontal guide rail and move closer to the middle through the sliding cooperation between the inclined guide block 212 and the inclined guide rail 205, and the interval distance between adjacent heat exchange plate bodies 211 becomes smaller.

[0067] In order to adapt to the lateral movement adjustment of each heat exchange plate body 211, the liquid inlet end of the radiator 4 is connected to the liquid inlet end of each heat exchange plate body 211 through a soft liquid inlet pipe 213, and the liquid return end of the radiator 4 is connected to the liquid return end of each heat exchange plate body 211 through a soft liquid return pipe 214.

[0068] Based on this embodiment, in combination with the inclined guide rails 205 symmetrically arranged on both sides of the inner wall of the conical slurry channel and the support frame with horizontal guide rails, the vertical movement and lateral movement adjustment of each heat exchange plate in the heat exchange unit are carried out simultaneously, so that the distance between each heat exchange plate is adjusted during the adjustment of the proportion of the cross-sectional area occupied by the heat exchange plate 211 in the conical slurry channel to maintain uniform heat exchange and improve the uniformity of the temperature of the output slurry, thereby improving the efficiency of the slurry in the desulfurization tower for cooling the flue gas desulfurization.

[0069] Embodiment 4:

[0070] like Figure 4 , Figure 7 and Fig. 9 As shown, on the basis of Example 2 and Example 3, the structure is further optimized. Specifically, each of the heat exchange plate bodies 211 is arranged at equal intervals and is connected to the outside with a transverse scissor-type connecting rod mechanism 215. During the vertical lifting and lowering adjustment process in the conical slurry channel driven by the adjustment mechanism 204, each of the heat exchange plate bodies 211 is constrained by the scissor-type connecting rod mechanism 215 and adjusted at equal intervals.

[0071] The scissor-type connecting rod mechanism 215 includes multiple groups of first connecting rods and second connecting rods of equal length and hinged in the middle, and each first connecting rod and second connecting rod are respectively connected between adjacent heat exchange plate bodies 211: one end of the first connecting rod is hinged to the upper end of the left heat exchange plate body 211, and the other end is connected to the lower end of the right heat exchange plate body 211; one end of the second connecting rod is hinged to the lower end of the left heat exchange plate body 211, and the other end is hinged to the upper end of the right heat exchange plate body 211.

[0072] The lower ends of the first connecting rod and the second connecting rod are connected to the lower ends of each heat exchange plate body 211 through a relatively loose movable connection, so as to be able to adapt to the vertical movement of the first connecting rod and the second connecting rod along each heat exchange plate body 211 during the rotation around the middle hinge axis. Specifically, an upper hinge axis with a fixed position can be set at the upper end of each heat exchange plate body 211, and a lower hinge axis that can be adjusted vertically along the heat exchange plate body 211 can be set at the lower end. For example, a vertical slide groove is set, and the lower hinge axis is slid in the vertical slide groove. The upper ends of the first connecting rod and the second connecting rod are respectively connected to the upper hinge axes of the adjacent left heat exchange plate body and the right heat exchange plate body, and the lower ends are respectively connected to the lower hinge axes of the adjacent right heat exchange plate body and the left heat exchange plate body.

[0073] like Fig.11 As shown, in some implementations, a wedge-shaped liquid flow channel 219 is provided in the inclined guide block 212, a wedge-shaped plug body 220 is provided in the wedge-shaped liquid flow channel 219, and the inclined guide block 212 is provided with an adjusting cylinder 221 drivingly connected to the wedge-shaped plug body 220. The slurry flow rate monitor is control-connected to the adjusting cylinder 221, and is configured to control the movement of the wedge-shaped plug body 220 in the wedge-shaped liquid flow channel 219 through the adjusting cylinder 221, so as to adjust the flow area of ​​the wedge-shaped liquid flow channel 219 to compensate for the change in flow area caused by the adjustment of the spacing between the heat exchange plates 211, and to achieve constant flow area before and after adjustment, so as to achieve constant flow of the cooling slurry, thereby achieving stable and continuous spraying in the desulfurization tower.

[0074] The flue gas treatment system based on the slurry cooling cycle provided by the above-mentioned embodiments can realize smooth flow of limestone slurry during the cooling process, and can stably adjust the slurry cooling temperature according to process requirements to effectively eliminate smoke plumes, soluble salts and dust in the flue gas, meet the needs of the flue gas desulfurization process, occupy a small area, have high desulfurization and cooling efficiency, and have broad application prospects.

[0075] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described.

[0076] Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein. Although some specific embodiments of the present invention have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A flue gas treatment system based on slurry cooling cycle, characterized in that: include: The desulfurization tower (1) is provided with a slurry spraying mechanism (13); A slurry cooler (2), wherein a heat exchange unit is arranged in a shell (201), wherein the heat exchange unit comprises a plurality of heat exchange plates (211) arranged at intervals, a slurry circulation pump (3) is connected between the bottom of the desulfurization tower (1) and the input end of the slurry cooler (2), and the output end of the slurry cooler (2) is connected to a slurry spraying mechanism (13); A radiator (4) is arranged outside the slurry cooler (2) and is circulatedly connected to the plurality of heat exchange plates (211) via a coolant circulation pump (41), wherein the coolant absorbs heat from the slurry at each of the heat exchange plates (211) and is cooled and dissipated at the radiator (4); as well as A cooling cycle controller (5) is electrically connected to the desulfurization tower (1), the slurry cooler (2) and the radiator (4); The slurry cooler (2) is provided with a tapered slurry channel arranged vertically, the heat exchange unit is movably arranged in the tapered slurry channel, a plurality of the heat exchange plate bodies (211) are arranged at intervals in the transverse direction, the slurry cooler (2) is provided with an adjustment mechanism (204) drivingly connected to the heat exchange unit, the cooling cycle controller (5) is electrically connected to the adjustment mechanism (204), the heat exchange plate bodies (211) are arranged at equal intervals and are connected to the outer sides with a transverse scissor-type connecting rod mechanism (215), and the heat exchange plate bodies (211) are constrained by the scissor-type connecting rod mechanism (215) and adjusted at equal intervals; and the adjustment mechanism (204) is configured to control the adjustment mechanism (204) to drive the heat exchange unit to move vertically in the tapered channel, so as to change the ratio of the heat exchange body to the cross-sectional area of ​​the variable-diameter channel.

2. The flue gas treatment system based on slurry cooling cycle according to claim 1 is characterized in that: A slurry temperature monitor (206) is provided at the outlet end of the slurry cooler (2), and the cooling cycle controller (5) is electrically connected to the slurry temperature monitor (206) and is configured to receive a slurry temperature monitoring value and compare it with a set value. When the slurry temperature monitoring value is higher than the set value, the regulating mechanism (204) is controlled to drive the heat exchange unit to move toward the small opening end of the tapered slurry channel to increase the ratio of the cross-sectional area of ​​the heat exchange plate body (211) to the cross-sectional area of ​​the variable diameter channel.

3. The flue gas treatment system based on slurry cooling cycle according to claim 1 is characterized in that: Each heat exchange plate body (211) of the heat exchange unit is connected in parallel with the radiator (4); a plurality of liquid flow channels are arranged in an array inside the heat-conducting shell of the heat exchange plate body (211); a coolant circulation pump (41) drives the low-temperature coolant in the radiator (4) to flow through the liquid flow channels inside each of the heat-conducting shells; and the high-temperature slurry flowing outside the heat-conducting shell exchanges heat with the coolant inside the heat-conducting shell to reduce the temperature.

4. The flue gas treatment system based on slurry cooling cycle according to claim 1 or 3, characterized in that: A coolant temperature monitor (43) is provided at the outlet end of the heat exchange unit, and the cooling cycle controller (5) is electrically connected to the coolant temperature monitor (43). The cooling cycle controller (5) is configured to receive a coolant temperature monitoring value and compare it with a set value. When the coolant temperature monitoring value is higher than the set value, the regulating mechanism (204) is controlled to drive the heat exchange unit to move toward the small opening end of the conical slurry channel to increase the ratio of the cross-sectional area of ​​the heat exchange plate body (211) to the cross-sectional area of ​​the variable diameter channel.

5. The flue gas treatment system based on slurry cooling cycle according to claim 1 is characterized in that: A flue gas temperature monitor (15) is provided at the outlet end of the desulfurization tower (1), and the cooling cycle controller (5) is electrically connected to the flue gas temperature monitor (15). The cooling cycle controller (5) is configured to receive a flue gas temperature monitoring value and compare it with a set value. When the flue gas temperature monitoring value is higher than the set value, the regulating mechanism (204) is controlled to drive the heat exchange unit to move toward the small opening end of the conical slurry channel to increase the ratio of the cross-sectional area of ​​the heat exchange plate body (211) to the cross-sectional area of ​​the variable diameter channel.

6. The flue gas treatment system based on slurry cooling cycle according to claim 3 is characterized in that: Inclined guide rails (205) are symmetrically arranged along the inner wall of the conical slurry channel on both sides, and the inclined guide rails (205) on both sides are arranged with a large spacing at the upper ends and a small spacing at the lower ends. The outermost heat exchange plate body (211) of the heat exchange unit is provided with an inclined guide block (212) that is slidably matched with the inclined guide rail (205). A bearing frame (217) and an adjusting rod (218) are provided between the adjusting mechanism (204) and each heat exchange plate body (211), and the adjusting rod (218) is connected between the adjusting mechanism (204) and the bearing frame (217).

7. The flue gas treatment system based on slurry cooling cycle according to claim 6 is characterized in that: The scissor-type connecting rod mechanism (215) comprises a plurality of groups of first connecting rods and second connecting rods of equal length and hinged in the middle, each of the first connecting rods and the second connecting rods being respectively connected between adjacent heat exchange plate bodies (211): one end of the first connecting rod is hinged to the upper end of the left heat exchange plate body (211), and the other end is connected to the lower end of the right heat exchange plate body (211); one end of the second connecting rod is hinged to the lower end of the left heat exchange plate body (211), and the other end is hinged to the upper end of the right heat exchange plate body (211).

8. The flue gas treatment system based on slurry cooling cycle according to claim 6, characterized in that: The inclined guide block (212) is provided with a wedge-shaped liquid flow channel (219), and a wedge-shaped plug body (220) is provided in the wedge-shaped liquid flow channel (219). The inclined guide block (212) is provided with an adjustment cylinder (221) drivingly connected to the wedge-shaped plug body (220). The slurry flow rate monitor is control-connected to the adjustment cylinder (221) and is configured to control the movement of the wedge-shaped plug body (220) in the wedge-shaped liquid flow channel (219) through the adjustment cylinder (221) to achieve flow area adjustment of the wedge-shaped liquid flow channel (219) to compensate for the change in flow area caused by the adjustment of the spacing between the heat exchange plates (211).

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