System and method for recycling waste heat of desulfurized high-temperature flue gas and slurry

Abstract

The invention discloses a system and a method for recycling waste heat of desulfurized high-temperature flue gas and slurry. Flue gas outlets of spray towers are communicated with one another sequentially through heat release sides of primary heat exchange areas in heat exchange equipment; an outlet of the spraying device is communicated with an inlet of the spraying tower, a spraying slurry outlet of the spraying tower is communicated with an inlet of a secondary heat exchange area in the heat exchanger through a heat absorption side of the heat exchange equipment, and an outlet of the secondary heat exchange area in the heat exchanger is communicated with an inlet of the heat pump. An outlet of the boiler water supply pipeline communicates with an inlet of the boiler through the water side of the economizer, a steam outlet of the boiler communicates with an inlet of the heat pump, and an outlet of the heating circulating water pipeline communicates with a heat absorption side inlet of a primary heat exchange area in the heat exchange equipment. And a heat absorption side outlet of the primary heat exchange area in the heat exchange equipment communicates with an inlet of the secondary heat exchange area in the heat exchange equipment. The system and the method can recycle high-temperature flue gas and slurry waste heat after desulfurization.

Description

Technical Field

[0001] The invention belongs to the technical field of waste heat utilization, and relates to a system and method for recovering waste heat of high-temperature flue gas and slurry after desulfurization. Background Art

[0002] A boiler is an energy conversion device. The energy input to the boiler includes chemical energy and electrical energy in the fuel. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. The fuel in the boiler burns to produce flue gas, which carries a large amount of waste heat. In order to reduce energy waste and achieve the goal of energy conservation and emission reduction, the waste heat of the flue gas needs to be recycled. After the flue gas is desulfurized, part of the waste heat will remain in the desulfurization slurry, and this part of the waste heat is not recycled. After the waste heat is recovered, there are fewer application scenarios for the recovered waste heat. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a system and method for recovering the waste heat of high-temperature flue gas and slurry after desulfurization. The system and method can recover the waste heat of high-temperature flue gas and slurry after desulfurization.

[0004] To achieve the above object, the present invention discloses a waste heat recovery and utilization system of high-temperature flue gas and slurry after desulfurization, including a boiler, an economizer, a dust collector, a spray tower, a spray device, a water pump, a heat exchange device, a heat exchanger, a heat pump and a heating pipeline;

[0005] The flue gas outlet of the boiler is divided into two routes, one of which is connected to the flue gas side of the economizer, and the other is connected to the flue gas inlet of the spray tower through the dust collector. The flue gas outlet of the spray tower is connected to the heat release side of the primary heat exchange area in the heat exchange equipment in turn;

[0006] The outlet of the spray device is connected with the inlet of the spray tower, the spray slurry outlet of the spray tower is connected with the inlet of the secondary heat exchange area in the heat exchanger via the heat absorption side of the heat exchange equipment, the outlet of the secondary heat exchange area in the heat exchanger is connected with the inlet of the heat pump, the outlet of the boiler feed water pipe is connected with the inlet of the boiler via the water side of the economizer, the steam outlet of the boiler is connected with the inlet of the heat pump, the outlet of the heating circulating water pipe is connected with the inlet of the heat absorption side of the primary heat exchange area in the heat exchange equipment, and the outlet of the heat absorption side of the primary heat exchange area in the heat exchange equipment is connected with the inlet of the secondary heat exchange area in the heat exchange equipment.

[0007] Furthermore, the flue gas outlet of the boiler is divided into two paths through a switching valve.

[0008] Furthermore, the flue gas side of the economizer is connected to a flue gas treatment device.

[0009] Furthermore, the spray slurry outlet of the spray tower is connected to the inlet of the secondary heat exchange area in the heat exchanger through a water pump and the heat absorption side of the heat exchange equipment.

[0010] Furthermore, the dust collector includes a cyclone separator, a separation chamber is arranged inside the cyclone separator, the bottom of the cyclone separator is connected to a dust collecting chamber, the side of the top of the cyclone separator is connected to an inlet pipe, the top of the cyclone separator is connected to an outlet pipe, the inlet pipe and the outlet pipe both extend into the separation chamber, and a storage tank is provided inside the cyclone separator and at the top of the separation chamber.

[0011] Furthermore, two first electric telescopic rods are connected to the top of the cyclone separator, wherein the two first electric telescopic rods are located on both sides of the outlet pipe, and the telescopic ends of the two first electric telescopic rods extend into the storage slot, and the telescopic ends of the two first electric telescopic rods are fixedly connected to a mounting plate, an annular cavity is opened inside the mounting plate, a gear ring is slidably connected inside the annular cavity, the bottom end of the gear ring extends to the bottom of the mounting plate and is fixedly connected to a fixed plate, and a plurality of second electric telescopic rods are fixedly connected to the outside of the fixed plate, and the telescopic ends of the second electric telescopic rods are connected to a first cleaning brush, and a servo motor is connected to the top of the mounting plate and on both sides of the gear ring, and the output end of the servo motor extends into the inside of the annular cavity and is rotatably connected to the bottom of the inner cavity of the annular cavity, and the outer side of the output end of the servo motor is provided with a driving gear matching the gear ring.

[0012] Furthermore, a through groove is provided inside the mounting plate and at the inner side of the annular cavity, a plurality of third electric telescopic rods are connected to the top of the fixed plate, the third electric telescopic rods pass through the through grooves and extend to the top of the mounting plate, a storage groove is provided at the bottom of the sealing plate, the telescopic end of the third electric telescopic rod is connected to a mounting block, the bottom end of the mounting block extends to the inside of the storage groove, a fourth electric telescopic rod is connected to the side of the mounting block, the telescopic end of the fourth electric telescopic rod extends to the side of the mounting block and is connected to a second cleaning brush, and the inner wall of the separation cavity is cleaned by the second cleaning brush.

[0013] Furthermore, a sealing block is connected to the bottom of each mounting block, and the interior of the storage groove is sealed by the sealing block.

[0014] The present invention discloses a method for recovering waste heat of high-temperature flue gas and slurry after desulfurization, comprising the following steps:

[0015] When switching the heating line, the flue gas generated by the boiler is passed into the dust collector for dust removal, and then the flue gas enters the spray tower. When the flue gas inside the spray tower is desulfurized, a reagent is sprayed into the flue gas inside the spray tower to desulfurize the flue gas. The spray slurry inside the spray tower is discharged into the heat exchange equipment through a water pump, and the flue gas is discharged into the primary heat exchange area to exchange heat with the heating circulating water to obtain low-temperature water. The low-temperature water then enters the secondary heat exchange area, and the low-temperature water is exchanged with the spray slurry to obtain high-temperature water. The high-temperature water is discharged into the heat exchanger for heat exchange. The steam input by the boiler drives the heat pump to work, and the temperature of the high-temperature water in the heat exchanger is increased. The hot water in the heat pump is input into the heating line through the heating pipeline for heating.

[0016] When the feed water line is switched, the flue gas enters the economizer to heat the boiler water to increase the temperature of the boiler water. The boiler water then enters the boiler for use, and the flue gas is discharged through the flue to subsequent processing equipment.

[0017] Furthermore, the dust collector includes a cyclone separator, a separation chamber is arranged inside the cyclone separator, the bottom of the cyclone separator is connected to a dust collecting chamber, the side of the top of the cyclone separator is connected to an inlet pipe, the top of the cyclone separator is connected to an outlet pipe, the inlet pipe and the outlet pipe both extend into the separation chamber, and a storage tank is provided inside the cyclone separator and at the top of the separation chamber.

[0018] The present invention has the following beneficial effects:

[0019] In the specific operation of the system and method for recovering the waste heat of the high-temperature flue gas and slurry after desulfurization described in the present invention, the flue gas enters the interior of the spray tower, and when the flue gas inside the spray tower is desulfurized, a reagent is sprayed into the flue gas inside the spray tower to desulfurize the flue gas, and the spray slurry inside the spray tower is discharged into the interior of the heat exchange equipment through a water pump, and the flue gas is discharged into the primary heat exchange area, and the heating circulating water is heat-exchanged to realize the recovery of the waste heat of the high-temperature flue gas after desulfurization, and the low-temperature water enters the secondary heat exchange area, and the low-temperature water is heat-exchanged by spraying slurry to obtain high-temperature water to realize the recovery of the waste heat of the slurry, and the recovered heat is used to heat the feed water, and then supplied to the heating circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a structural diagram of the present invention;

[0022] Figure 2 is a structural diagram of the dust collector 4;

[0023] Figure 3 A bottom view of the mounting plate 17;

[0024] Figure 4 for Figure 2 Enlarged view of point A in the middle.

[0025] Among them, 1 is a boiler, 2 is a switching valve, 3 is an economizer, 4 is a dust collector, 5 is a spray tower, 6 is a spray device, 7 is a water pump, 8 is a heat exchange device, 9 is a heat exchanger, 10 is a heat pump, 11 is a heating pipe, 12 is a cyclone separator, 13 is a separation chamber, 14 is an outlet pipe, 15 is a first electric telescopic rod, 16 is a storage tank, 17 is a mounting plate, 18 is an annular cavity, 19 is a servo motor, 20 is a driving gear, 21 is a gear ring, 22 is a through groove, 23 is a fixed plate, 24 is a second electric telescopic rod, 25 is a first cleaning brush, 26 is a sealing plate, 27 is a storage groove, 28 is a third electric telescopic rod, 29 is a mounting block, 30 is a fourth electric telescopic rod, 31 is a second cleaning brush, 32 is a sealing block, 33 is an inlet pipe, and 34 is a dust collecting chamber. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0028] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0029] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0030] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0031] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0034] refer to Figure 1 The waste heat recovery and utilization system of high-temperature flue gas and slurry after desulfurization of the present invention comprises a boiler 1, a switching valve 2, an economizer 3, a dust collector 4, a spray tower 5, a spray device 6, a water pump 7, a heat exchange device 8, a heat exchanger 9, a heat pump 10 and a heating pipeline 11;

[0035] The flue gas outlet of the boiler 1 is connected to the inlet of the switching valve 2. The outlet of the switching valve 2 is divided into two paths, one of which is connected to the flue gas treatment equipment through the flue gas side of the economizer 3, and the other is connected to the flue gas inlet of the spray tower 5 through the dust collector 4. The flue gas outlet of the spray tower 5 is connected to the heat release side of the primary heat exchange area in the heat exchange equipment 8 in turn;

[0036] The outlet of the spray device 6 is connected to the inlet of the spray tower 5, the spray slurry outlet of the spray tower 5 is connected to the inlet of the secondary heat exchange area in the heat exchanger 9 via the water pump 7 and the heat absorption side of the heat exchange equipment 8, the outlet of the secondary heat exchange area in the heat exchanger 9 is connected to the inlet of the heat pump 10, the outlet of the boiler feed water pipe is connected to the inlet of the boiler 1 via the water side of the economizer 3, the steam outlet of the boiler 1 is connected to the inlet of the heat pump 10, the outlet of the heating circulating water pipe is connected to the inlet of the heat absorption side of the primary heat exchange area in the heat exchange equipment 8, and the outlet of the heat absorption side of the primary heat exchange area in the heat exchange equipment 8 is connected to the inlet of the secondary heat exchange area in the heat exchange equipment 8.

[0037] The boiler 1 is used to generate steam and flue gas; the switching valve 2 is used to switch the heating line or the water supply line according to the seasonal weather conditions; the dust collector 44 is used to pass the flue gas generated by the boiler 1 into the dust collector 4 for dust removal when switching the heating line; the spray tower 5 is used to spray the flue gas after dust removal for desulfurization; the spray device 6 is used to spray the reagent into the flue gas inside the spray tower 5 when desulfurizing the flue gas inside the spray tower 5; the water pump 7 discharges the spray slurry inside the spray tower 5 into the heat exchange device 8 The heat exchange device 8 is used to discharge the flue gas into the primary heat exchange area, exchange heat with the heating circulating water to obtain low-temperature water, and then the low-temperature water enters the secondary heat exchange area, exchanges heat with the low-temperature water by spraying slurry to obtain high-temperature water; the heat exchanger 9 is used to exchange heat with the high-temperature water; the heat pump 10 is used to drive the heat pump 10 to work through the steam input by the boiler 1, so as to increase the temperature of the high-temperature water in the heat exchanger 9; the heating pipe 11 is used to input the hot water in the heat pump 10 into the heating circuit through the heating pipe 11 for heating.

[0038] Among them, when the economizer 3 is used to switch the water supply line, the flue gas enters the economizer 3 to heat the boiler water, increase the temperature of the boiler water, and then the boiler water enters the boiler 1 for use, and the flue gas is discharged to the subsequent processing equipment through the flue.

[0039] refer to Figure 2 , Figure 3 and Figure 4The dust collector 4 includes a cyclone separator 12, a separation chamber 13 is arranged inside the cyclone separator 12, a dust collecting chamber 34 is connected to the bottom of the cyclone separator 12, an inlet pipe 33 is connected to the side of the top of the cyclone separator 12, an outlet pipe 14 is connected to the top of the cyclone separator 12, the inlet pipe 33 and the outlet pipe 14 both extend into the separation chamber 13, a storage slot 16 is provided inside the cyclone separator 12 and located at the top of the separation chamber 13, two first electric telescopic rods 15 are connected to the top of the cyclone separator 12, wherein the two first electric telescopic rods 15 are located on both sides of the outlet pipe 14, the telescopic ends of the two first electric telescopic rods 15 both extend into the storage slot 16, the telescopic ends of the two first electric telescopic rods 15 are fixedly connected to a mounting plate 17, an annular cavity 18 is provided inside the mounting plate 17, a gear ring 21 is slidably connected inside the annular cavity 18, and the bottom end of the gear ring 21 extends to A fixed disk 23 is fixedly connected to the bottom of the mounting disk 17, and a plurality of second electric telescopic rods 24 are fixedly connected to the outside of the fixed disk 23. The telescopic ends of the second electric telescopic rods 24 are connected to the first cleaning brushes 25. A servo motor 19 is connected to the top of the mounting disk 17 and to both sides of the gear ring 21. The output end of the servo motor 19 extends to the inside of the annular cavity 18 and is rotatably connected to the bottom of the inner cavity of the annular cavity 18. A driving gear 20 that matches the gear ring 21 is sleeved on the outside of the output end of the servo motor 19. The driving gear 20 can drive the gear ring 21 to drive the fixed disk 23 to rotate, so that the fixed disk 23 drives the second electric telescopic rod 24 and the first cleaning brush 25 to rotate, so that the fixed disk 23 drives the fourth electric telescopic rod 30 and the second cleaning brush 31 to rotate through the third electric telescopic rod 28 and the mounting block 29, thereby cleaning the inner wall of the separation chamber 13 through the second cleaning brush 31.

[0040] Among them, a through slot 22 is provided inside the mounting plate 17 and located inside the annular cavity 18, a plurality of third electric telescopic rods 28 are connected to the top of the fixing plate 23, the third electric telescopic rods 28 pass through the through slot 22 and extend to the top of the mounting plate 17, a receiving groove 27 is provided at the bottom of the sealing plate 26, a mounting block 29 is connected to the telescopic end of the third electric telescopic rod 28, the bottom end of the mounting block 29 extends to the inside of the receiving groove 27, a fourth electric telescopic rod 30 is connected to the side of the mounting block 29, the telescopic end of the fourth electric telescopic rod 30 extends to the side of the mounting block 29 and is connected to a second cleaning brush 31, and the inner wall of the separation cavity 13 is cleaned by the second cleaning brush 31. A sealing block 32 is connected to the bottom of each mounting block 29, the inside of the receiving groove 27 is sealed by the sealing block 32, and the storage groove 16 is sealed by the sealing plate 26 and the sealing block 32.

[0041] The method for recovering and utilizing waste heat of high-temperature flue gas and slurry after desulfurization of the present invention comprises the following steps:

[0042] According to seasonal weather conditions, the heating line or the water supply line is switched. When switching the heating line, the flue gas generated by the boiler 1 is passed into the dust collector 4 for dust removal, and then the flue gas enters the spray tower 5. When the flue gas inside the spray tower 5 is desulfurized, a reagent is sprayed into the flue gas inside the spray tower 5 to desulfurize the flue gas. The spray slurry inside the spray tower 5 is discharged into the heat exchange equipment 8 through the water pump 7, and the flue gas is discharged into the primary heat exchange area to exchange heat with the heating circulating water to obtain low-temperature water. Then the low-temperature water enters the secondary heat exchange area, and the low-temperature water is exchanged with the spray slurry to obtain high-temperature water. The high-temperature water is discharged into the heat exchanger 9 for heat exchange. The steam input by the boiler 1 drives the heat pump 10 to work, thereby increasing the temperature of the high-temperature water in the heat exchanger 9, and the hot water in the heat pump 10 is input into the heating line through the heating pipe 11 for heating.

[0043] When the water supply line is switched, the flue gas enters the economizer 3 to heat the boiler water, thereby increasing the temperature of the boiler water. The boiler water then enters the boiler 1 for use, and the flue gas is discharged through the flue to subsequent processing equipment.

[0044] During flue gas dust removal, the flue gas enters the separation chamber 13 through the inlet pipe 33 for cyclone dust removal, and the flue gas is discharged into the subsequent processing equipment through the outlet pipe 14, and the dust falls into the dust collecting chamber 34. When the inner wall of the separation chamber 13 needs to be cleaned, the telescopic end of the first electric telescopic rod 15 pushes the storage slot 16 downward, so that the storage slot 16 moves to the inside of the separation chamber 13, and then the telescopic end of the second electric telescopic rod 24 pushes the first cleaning brush 25 to move, so that the first cleaning brush 25 contacts the inner wall of the separation chamber 13, and then the output end of the servo motor 19 drives the driving gear 20 to rotate, so that the driving gear 20 drives the ring gear 21 to drive the fixed disk 23 to rotate, so that the fixed disk 23 drives the second electric telescopic rod 24 and the first cleaning brush 25 to rotate, and the inner wall of the separation chamber 13 is cleaned by the first cleaning brush 25 After the storage slot 16 reaches a position where it cannot move further downward, the telescopic end of the third electric telescopic rod 28 pushes the mounting block 29 to move to the bottom of the sealing disk 26, and the telescopic end of the fourth electric telescopic rod 30 pushes the second cleaning brush 31 to move, so that the second cleaning brush 31 contacts the inner wall of the separation chamber 13, and then the third electric telescopic rod 28 and the mounting block 29 and the fourth electric telescopic rod 30 and the second cleaning brush 31 are driven to rotate through the fixed plate 23, so that the inner wall of the separation chamber 13 is cleaned by the second cleaning brush 31. After the inner wall of the separation chamber 13 is cleaned, the telescopic end of the third electric telescopic rod 28 drives the mounting block 29 to move upward, so that the sealing block 32 is located inside the storage slot 27, and then the telescopic end of the first electric telescopic rod 15 drives the mounting plate 17 to move upward, so that the sealing plate 26 is located inside the storage slot 16.

[0045] The present invention has the following characteristics:

[0046] The waste heat recovery and utilization system of the high-temperature flue gas and slurry after desulfurization is provided with a boiler 1, a switching valve 2 and a heating pipe 11. The system can switch the heating line or the water supply line according to the seasonal weather conditions. After switching the heating line, the waste heat of the flue gas and the spraying slurry is recovered and utilized, and the heating circulating water is heated for heating. In seasons when heating is not required, the flue gas can enter the economizer 3 to heat the boiler water to increase the temperature of the boiler water, and then the boiler water can enter the boiler 1 for use, thereby reducing energy consumption.

[0047] The waste heat recovery and utilization system of high-temperature flue gas and slurry after desulfurization is provided with a cyclone separator 12, a separation chamber 13 and a dust collecting chamber 34. When it is necessary to clean the inner wall of the separation chamber 13, the telescopic end of the first electric telescopic rod 15 pushes the storage tank 16 downward, so that the storage tank 16 moves to the inside of the separation chamber 13, and then the telescopic end of the second electric telescopic rod 24 pushes the first cleaning brush 25 to move, so that the first cleaning brush 25 contacts the inner wall of the separation chamber 13, and then the output end of the servo motor 19 drives the driving gear 20 to rotate, so that the driving gear 20 drives the gear ring 21 to drive the fixed disk 23 to rotate, so that the fixed disk 23 drives the second electric telescopic rod 24 to contact the first cleaning brush 25. The cleaning brush 25 rotates, and the inner wall of the separation chamber 13 is cleaned by the first cleaning brush 25. After the storage slot 16 reaches a position where it cannot move further downward, the telescopic end of the third electric telescopic rod 28 pushes the mounting block 29 to move to the bottom of the sealing disk 26, and the telescopic end of the fourth electric telescopic rod 30 pushes the second cleaning brush 31 to move, so that the second cleaning brush 31 contacts the inner wall of the separation chamber 13, and then the third electric telescopic rod 28, the mounting block 29, the fourth electric telescopic rod 30 and the second cleaning brush 31 are driven to rotate through the fixed disk 23, so that the inner wall of the separation chamber 13 is cleaned by the second cleaning brush 31, and the dust on the inner wall of the separation chamber 13 can be automatically cleaned.

[0048] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0049] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0050] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A waste heat recovery system for high-temperature flue gas and slurry after desulfurization, characterized in that: It comprises a boiler (1), an economizer (3), a dust collector (4), a spray tower (5), a spray device (6), a water pump (7), a heat exchange device (8), a heat exchanger (9), a heat pump (10) and a heating pipeline (11); The flue gas outlet of the boiler (1) is divided into two paths, one of which is connected to the flue gas side of the economizer (3), and the other is connected to the flue gas inlet of the spray tower (5) through the dust collector (4), and the flue gas outlet of the spray tower (5) is connected in turn through the heat release side of the primary heat exchange area in the heat exchange device (8); The outlet of the spray device (6) is connected to the inlet of the spray tower (5); the outlet of the spray slurry of the spray tower (5) is connected to the inlet of the secondary heat exchange area in the heat exchanger (9) via the heat absorption side of the heat exchange device (8); the outlet of the secondary heat exchange area in the heat exchanger (9) is connected to the inlet of the heat pump (10); the outlet of the boiler feed water pipeline is connected to the inlet of the boiler (1) via the water side of the economizer (3); the steam outlet of the boiler (1) is connected to the inlet of the heat pump (10); the outlet of the heating circulation water pipeline is connected to the inlet of the heat absorption side of the primary heat exchange area in the heat exchange device (8); and the outlet of the heat absorption side of the primary heat exchange area in the heat exchange device (8) is connected to the inlet of the secondary heat exchange area in the heat exchange device (8).

2. The waste heat recovery and utilization system of high-temperature flue gas and slurry after desulfurization according to claim 1 is characterized in that: The flue gas outlet of the boiler (1) is divided into two paths via a switching valve (2).

3. The waste heat recovery and utilization system of high-temperature flue gas and slurry after desulfurization according to claim 1 is characterized in that: The flue gas side of the economizer (3) is connected to a flue gas treatment device.

4. The waste heat recovery and utilization system of high-temperature flue gas and slurry after desulfurization according to claim 1 is characterized in that: The spray slurry outlet of the spray tower (5) is connected to the inlet of the secondary heat exchange area in the heat exchanger (9) through the water pump (7) and the heat absorption side of the heat exchange equipment (8).

5. The waste heat recovery and utilization system of high-temperature flue gas and slurry after desulfurization according to claim 1 is characterized in that: The dust collector (4) comprises a cyclone separator (12), a separation chamber (13) is arranged inside the cyclone separator (12), a dust collecting chamber (34) is connected to the bottom of the cyclone separator (12), an inlet pipe (33) is connected to the side of the top of the cyclone separator (12), an outlet pipe (14) is connected to the top of the cyclone separator (12), the inlet pipe (33) and the outlet pipe (14) both extend into the separation chamber (13), and a storage tank (16) is provided inside the cyclone separator (12) and at the top of the separation chamber (13).

6. The waste heat recovery and utilization system of high-temperature flue gas and slurry after desulfurization according to claim 5 is characterized in that: Two first electric telescopic rods (15) are connected to the top of the cyclone separator (12), wherein the two first electric telescopic rods (15) are located on both sides of the outlet pipe (14), the telescopic ends of the two first electric telescopic rods (15) extend into the storage tank (16), the telescopic ends of the two first electric telescopic rods (15) are fixedly connected to a mounting plate (17), an annular cavity (18) is provided inside the mounting plate (17), a gear ring (21) is slidably connected inside the annular cavity (18), and the bottom end of the gear ring (21) extends to the bottom of the mounting plate (17) and is fixedly connected to the storage tank (16). A fixed plate (23) is fixedly connected, and a plurality of second electric telescopic rods (24) are fixedly connected to the outer side of the fixed plate (23), and the telescopic ends of the second electric telescopic rods (24) are connected to first cleaning brushes (25). The top of the mounting plate (17) and both sides of the gear ring (21) are connected to servo motors (19), and the output end of the servo motor (19) extends to the inside of the annular cavity (18) and is rotatably connected to the bottom of the inner cavity of the annular cavity (18), and the outer side of the output end of the servo motor (19) is sleeved with a driving gear (20) that matches the gear ring (21).

7. The waste heat recovery and utilization system of high-temperature flue gas and slurry after desulfurization according to claim 6 is characterized in that: A through slot (22) is provided inside the mounting plate (17) and at an inner position of the annular cavity (18); a plurality of third electric telescopic rods (28) are connected to the top of the fixing plate (23); the third electric telescopic rods (28) pass through the through slots (22) and extend to the top of the mounting plate (17); a receiving slot (27) is provided at the bottom of the sealing plate (26); a mounting block (29) is connected to the telescopic end of the third electric telescopic rod (28); the bottom end of the mounting block (29) extends to the inside of the receiving slot (27); a fourth electric telescopic rod (30) is connected to the side of the mounting block (29); the telescopic end of the fourth electric telescopic rod (30) extends to the side of the mounting block (29) and is connected to a second cleaning brush (31); and the inner wall of the separation cavity (13) is cleaned by the second cleaning brush (31).

8. The waste heat recovery and utilization system of high-temperature flue gas and slurry after desulfurization according to claim 7 is characterized in that: The bottom of each mounting block (29) is connected to a sealing block (32), and the interior of the storage groove (27) is sealed by the sealing block (32).

9. A method for recovering waste heat from high-temperature flue gas and slurry after desulfurization, characterized in that: The waste heat recovery and utilization system of high-temperature flue gas and slurry after desulfurization according to claim 1 comprises the following steps: When switching the heating circuit, the flue gas generated by the boiler (1) is passed into the dust collector (4) for dust removal, and then the flue gas enters the spray tower (5). When the flue gas in the spray tower (5) is desulfurized, a reagent is sprayed into the flue gas in the spray tower (5) to desulfurize the flue gas. The spray slurry in the spray tower (5) is discharged into the heat exchange device (8) through the pump (7). The flue gas is discharged into the primary heat exchange area to exchange heat with the heating circulating water to obtain low-temperature water. The low-temperature water then enters the secondary heat exchange area. The low-temperature water is exchanged with the spray slurry to obtain high-temperature water. The high-temperature water is discharged into the heat exchanger (9) for heat exchange. The steam input from the boiler (1) drives the heat pump (10) to work, thereby increasing the temperature of the high-temperature water in the heat exchanger (9). The hot water in the heat pump (10) is input into the heating circuit through the heating pipe (11) for heating. When the feed water line is switched, the flue gas enters the economizer (3) to heat the boiler water to increase the temperature of the boiler water, and then the boiler water enters the boiler (1) for use, and the flue gas is discharged through the flue to subsequent processing equipment.

10. The method for recovering waste heat from high-temperature flue gas and slurry after desulfurization according to claim 9, characterized in that: The dust collector (4) comprises a cyclone separator (12), a separation chamber (13) is arranged inside the cyclone separator (12), a dust collecting chamber (34) is connected to the bottom of the cyclone separator (12), an inlet pipe (33) is connected to the side of the top of the cyclone separator (12), an outlet pipe (14) is connected to the top of the cyclone separator (12), the inlet pipe (33) and the outlet pipe (14) both extend into the separation chamber (13), and a storage tank (16) is provided inside the cyclone separator (12) and at the top of the separation chamber (13).

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