Boiler tail waste heat utilization system

Abstract

The invention provides a boiler tail waste heat utilization system which comprises an outer barrel, a top disc is fixed to the top end of the outer barrel, an annular cavity is formed in the outer barrel, two sets of spiral pipes are assembled in the annular cavity, a flow collecting barrel is installed in the middle of the outer barrel, and multiple sets of blocking discs are fixed to the interior of the flow collecting barrel. Notches are formed in the curved-surface outer walls of every two sets of blocking discs in a staggered mode, and two sets of turn-back pipes are symmetrically installed on the curved-surface outer walls of the flow collecting barrels. According to the implementation mode, water in the outer cylinder is vertically conveyed upwards through the propeller and conveyed to the lower layer again through the flow collecting cylinder, so that the water in the outer cylinder has a certain flowing effect, a blocking disc is matched with a return pipe arranged outside, waste heat of smoke is better transferred into the water body, meanwhile, the water body is heated from outside to inside through a spiral pipe, and the water body is heated through the spiral pipe; the water to be heated can absorb heat efficiently and fully, and finally the effect of efficient waste heat utilization is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of boiler waste heat, and in particular to a boiler tail waste heat utilization system. 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 original meaning of pot refers to a water container heated on fire, and furnace refers to a place where fuel is burned. The boiler consists of two major parts: pot and furnace. The hot water or steam generated in the boiler can directly provide the required thermal energy for industrial production and people's lives, or it can be converted into mechanical energy through a steam power device, or the mechanical energy can be converted into electrical energy through a generator. A boiler that provides hot water is called a hot water boiler, which is mainly used for life and also has a small number of applications in industrial production. A boiler that produces steam is called a steam boiler, often referred to as a boiler, and is mostly used in thermal power plants, ships, locomotives and industrial and mining enterprises.

[0003] As the whole society pays more and more attention to the protection of the natural environment, energy conservation and environmental protection are important contents for the development of manufacturing enterprises. Energy conservation and environmental protection can effectively improve the utilization rate of energy, reduce production costs, reduce product prices, and improve product competitiveness and economic benefits. In many enterprises, it is necessary to use boilers to generate high-temperature steam for production use. In the process of burning coal in the boiler, a large amount of high-temperature flue gas will be generated. If the high-temperature flue gas discharged from the tail flue of the boiler is directly discharged into the atmosphere, it will not only pollute the environment, but also cause energy waste due to the high temperature taking away a large amount of waste heat.

[0004] At present, when treating the waste heat of flue gas at the tail end of a boiler, the flue gas is usually introduced into a water tank and the waste heat of the flue gas is recovered and utilized by condensing water. However, the water to be heated is static, so it takes a long time to absorb the waste heat, resulting in low heat exchange efficiency. Therefore, a waste heat utilization system for the tail end of a boiler is proposed. Summary of the invention

[0005] The content of the present invention is used to introduce the concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of the present disclosure is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0006] The present invention provides a boiler tail waste heat utilization system to solve the technical problems mentioned in the above background technology part.

[0007] The boiler tail waste heat utilization system comprises an outer tube, a top plate is fixed on the top of the outer tube, an annular cavity is opened in the outer tube, two groups of spiral tubes are installed in the annular cavity, a collecting tube is installed in the outer tube and in the center, multiple groups of blocking disks are fixed inside the collecting tube, and the curved outer walls of every two groups of the blocking disks are staggered with notches, and two groups of return tubes are symmetrically installed on the curved outer wall of the collecting tube;

[0008] Guide cylinders are fixed on both sides of the collecting cylinder at the bottom end of the outer cylinder, a propeller is rotatably installed inside the guide cylinder, a driving motor connected to the top of the propeller is installed on the top of the top plate, a guide nozzle is fixed on the curved outer wall of the guide cylinder near the top, and the end of the guide nozzle is located above the top of the collecting cylinder.

[0009] Optionally, the outer wall of the outer tube is provided with a smoke inlet pipe extending into the annular cavity and docking with one end of the spiral tube, and the other end of the spiral tube extends into the outer tube and is connected with a connecting pipe at one end of the return tube.

[0010] Optionally, the return tube is arc-shaped and fits on the outer wall of the collecting tube, and the other end of the return tube is connected to a smoke outlet pipe extending to the outside of the outer tube.

[0011] Optionally, two groups of water inlet notches are provided at the bottom end of the guide cylinder.

[0012] Optionally, a water outlet gap is provided at the top of the guide cylinder at a position corresponding to the guide nozzle.

[0013] Optionally, the top plate is fixed to the top of the outer cylinder by bolts, and the outer walls of the two groups of propellers are located below the top plate and are sleeved with a transmission belt.

[0014] Optionally, a pulley is provided at a position where the outer wall of the propeller contacts the transmission belt.

[0015] Optionally, a water inlet pipe penetrating the top plate is provided at the front side of the top end of the top plate.

[0016] Optionally, a drainage pipe is provided on the other side of the top of the top plate, and the bottom end of the drainage pipe passes through the top plate and is close to the inner bottom end of the outer tube.

[0017] Optionally, the top end of the collecting tube is in an outwardly flared trumpet shape, and a support arm is welded between the outer wall of the collecting tube and the two groups of guide tubes.

[0018] The above-mentioned embodiments of the present invention have the following beneficial effects: through the boiler tail waste heat utilization system of some embodiments of the present invention, the water in the outer cylinder is transported vertically upward through the propeller, and is transported to the lower layer again through the collecting tube, so that the water in the outer cylinder has a certain flow effect, and the blocking plate cooperates with the return pipe arranged on the outside to better transfer the waste heat of the flue gas into the water body. At the same time, the spiral tube heats the water body from the outside to the inside, so that the water to be heated absorbs heat efficiently and fully, and finally achieves the efficient effect of waste heat utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a three-dimensional structural diagram of an embodiment of the boiler tail waste heat utilization system of the present invention;

[0021] Figure 2 It is a schematic cross-sectional structure diagram of an embodiment of a boiler tail waste heat utilization system of the present invention;

[0022] Figure 3 A cross-sectional view of an embodiment of a boiler tail waste heat utilization system of the present invention;

[0023] Figure 4 It is a structural schematic diagram of an embodiment of the spiral tube and the guide cylinder of the present invention;

[0024] Figure 5 The figure is a cross-sectional structural diagram of an embodiment of the collecting tube of the present invention.

[0025] Description of reference numerals:

[0026] 100, outer cylinder; 101, smoke outlet pipe; 102, smoke inlet pipe; 103, annular cavity;

[0027] 110, top plate; 120, spiral tube; 121, connecting tube; 130, guide tube; 131, propeller; 132, guide nozzle; 140, collecting tube; 141, return tube; 142, blocking plate; 143, notch; 150, driving motor. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0032] See also Figures 1 to 5 The boiler tail waste heat utilization system includes an outer tube 100, a top plate 110 is fixed at the top of the outer tube 100, an annular cavity 103 is opened in the outer tube 100, two groups of spiral tubes 120 are installed in the annular cavity 103, a collecting tube 140 is installed in the outer tube 100 and in the center, a plurality of groups of blocking disks 142 are fixed inside the collecting tube 140, and the curved outer walls of every two groups of blocking disks 142 are staggered with notches 143, and two groups of return tubes 141 are symmetrically installed on the curved outer wall of the collecting tube 140;

[0033] A guide cylinder 130 is fixed at the bottom end of the outer cylinder 100 on both sides of the collecting cylinder 140, a propeller 131 is rotatably installed inside the guide cylinder 130, a driving motor 150 connected to the top of the propeller 131 is installed on the top of the top plate 110, and a guide nozzle 132 is fixed near the top of the curved outer wall of the guide cylinder 130, and the end of the guide nozzle 132 is located above the top of the collecting cylinder 140.

[0034] First, the outlet of the boiler exhaust gas is connected to the two sets of smoke inlet pipes 102 arranged outside the outer tube 100 through a pipe. A filter device can be installed at the end of the connecting pipe to filter the particles of the smoke. At the same time, an extension pipe is connected to the smoke outlet pipe 101, and the smoke is discharged to the outside after being processed.

[0035] The flue gas rises in a spiral along the spiral tube 120 in the annular cavity 103, and can have a preliminary heating effect on the water near the inner wall of the outer cylinder 100. The flue gas will enter the return tube 141 through the connecting tube 121. At this time, the output end of the driving motor 150 rotates to rotate the two sets of propellers 131, and cooperate with the guide tube 130 to transport the water at the bottom of the outer cylinder 100 vertically upward until it enters the collecting tube 140 on one side. The internal blocking disk 142 and the staggered notches 143 make the water entering the collecting tube 140 hit the blocking disk 142, making its flow rate from top to bottom slower. Cooperating with the return tube 141 on the outer wall, the heat in the flue gas is fully dissipated into the water body, so that the water in the outer cylinder 100 flows and can absorb the waste heat of the flue gas more comprehensively, thereby achieving a better heat exchange purpose. The flue gas is finally discharged through the smoke outlet pipe 101.

[0036] Please refer to Figure 3 The outer wall of the outer tube 100 is provided with a smoke inlet pipe 102 extending into the annular cavity 103 and docking with one end of the spiral tube 120. The other end of the spiral tube 120 extends into the outer tube 100 and is connected to a connecting tube 121 connected to one end of the return tube 141. The return tube 141 is arc-shaped and fits against the outer wall of the collecting tube 140. The other end of the return tube 141 is connected to the smoke outlet pipe 101 extending to the outside of the outer tube 100.

[0037] One end of the two groups of return tubes 141 is connected to one end of the two groups of spiral tubes 120 respectively. Similarly, the other end of the return tube 141 extends to the outside of the outer tube 100 through the smoke outlet pipe 101, so that the smoke generated by the boiler passes through the two groups of spiral tubes 120 to perform heat exchange operations in the outer tube 100.

[0038] Please refer to Figure 2 Two groups of water inlet notches are opened at the bottom of the guide cylinder 130 , and a water outlet notch is opened at the top of the guide cylinder 130 at a position corresponding to the guide nozzle 132 .

[0039] The water inside the outer cylinder 100 enters the guide cylinder 130 through the water inlet gap, and is transported upward under the action of the propeller 131, and finally enters the guide nozzle 132 through the water outlet gap until it is discharged.

[0040] Please refer to Figure 1 The top plate 110 is fixed to the top of the outer cylinder 100 by bolts. The outer walls of the two sets of propellers 131 are located below the top plate 110 and are sleeved with a transmission belt. A pulley is provided at the contact position between the outer wall of the propeller 131 and the transmission belt. The output end of the drive motor 150 is connected to the end of the propeller 131 by a coupling.

[0041] The detachable top plate 110 allows the components disposed in the outer cylinder 100 to be disassembled and maintained;

[0042] The transmission belt can drive the two sets of propellers 131 to rotate synchronously, so that the water at the bottom of the outer cylinder 100 can be efficiently transported upward. At the same time, with the coordination of the pulley, the transmission of the two sets of propellers 131 will not slip.

[0043] Please refer to Figure 1 A water inlet pipe is provided on the front side of the top of the top plate 110 and passes through the top plate 110 . A drainage pipe is provided on the other side of the top of the top plate 110 . The bottom end of the drainage pipe passes through the top plate 110 and is close to the inner bottom end of the outer tube 100 .

[0044] The water in the outer tube 100 that has absorbed heat and heated up can be discharged to the outside, and at the same time, the water to be heated from the outside can be transported to the outer tube, thereby achieving the purpose of high efficiency in utilizing the waste heat of boiler flue gas.

[0045] Please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 The top of the collecting tube 140 is in the shape of a trumpet that expands outward, and a support arm is welded between the outer wall of the collecting tube 140 and the two groups of guide tubes 130.

[0046] The outwardly expanded top end can enlarge the channel for water flow to enter, so that the water flow can enter the collecting tube 140 better. At the same time, with the assistance of the support arm, the collecting tube 140 can be kept in a vertical state.

[0047] When in use, the outlet of the boiler exhaust gas is first connected to the two groups of smoke inlet pipes 102 arranged outside the outer tube 100 through a pipe, and a filter device can be installed at the end of the connecting pipe to filter the particles of the smoke. At the same time, an extension pipe is used to connect with the smoke outlet pipe 101, and the smoke is discharged to the outside after being processed.

[0048] The smoke rises in the annular cavity 103 along the spiral tube 120, and can perform a preliminary heating effect on the water near the inner wall of the outer cylinder 100. The smoke will enter the return tube 141 through the connecting tube 121.

[0049] At this time, the output end of the driving motor 150 rotates, causing the two sets of propellers 131 to rotate, and cooperate with the guide tube 130 to transport the water at the bottom of the outer tube 100 vertically upward until it enters the collecting tube 140 on one side. The internal blocking disk 142 and the staggered notches 143 make the water entering the collecting tube 140 hit the blocking disk 142, making its flow rate from top to bottom slower, and cooperate with the return tube 141 on the outer wall, so that the heat in the flue gas is fully dissipated into the water body, so that the water in the outer tube 100 flows, which can more comprehensively absorb the waste heat of the flue gas, thereby achieving a better heat exchange purpose, and the flue gas is finally discharged through the smoke outlet pipe 101.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A boiler tail waste heat utilization system, characterized in that: It comprises an outer cylinder, a top plate is fixed on the top of the outer cylinder, an annular cavity is opened in the outer cylinder, two groups of spiral tubes are installed in the annular cavity, a collecting cylinder is installed in the center of the outer cylinder, multiple groups of blocking disks are fixed inside the collecting cylinder, and the curved outer walls of every two groups of blocking disks are staggered with notches, and two groups of return tubes are symmetrically installed on the curved outer wall of the collecting cylinder; Guide cylinders are fixed on both sides of the collecting cylinder at the bottom end of the outer cylinder, a propeller is rotatably installed inside the guide cylinder, a driving motor connected to the top of the propeller is installed on the top of the top plate, a guide nozzle is fixed on the curved outer wall of the guide cylinder near the top, and the end of the guide nozzle is located above the top of the collecting cylinder.

2. The boiler tail waste heat utilization system according to claim 1, characterized in that: The outer wall of the outer tube is provided with a smoke inlet pipe extending into the annular cavity and butting against one end of the spiral tube, and the other end of the spiral tube extends into the outer tube and is connected to a connecting pipe connected to one end of the return tube.

3. The boiler tail waste heat utilization system according to claim 1, characterized in that: The return tube is arc-shaped and fits on the outer wall of the collecting tube, and the other end of the return tube is connected to a smoke outlet pipe extending to the outside of the outer tube.

4. The boiler tail waste heat utilization system according to claim 1, characterized in that: The bottom end of the guide cylinder is provided with two groups of water inlet notches.

5. The boiler tail waste heat utilization system according to claim 4, characterized in that: A water outlet notch is provided at the top of the guide cylinder and at a position corresponding to the guide nozzle.

6. The boiler tail waste heat utilization system according to claim 1, characterized in that: The top plate is fixed to the top of the outer cylinder by bolts, and the outer walls of the two groups of propellers are located below the top plate and are sleeved with transmission belts.

7. The boiler tail waste heat utilization system according to claim 6, characterized in that: A pulley is provided at a position where the outer wall of the propeller contacts the transmission belt.

8. The boiler tail waste heat utilization system according to claim 1, characterized in that: A water inlet pipe penetrating through the top plate is arranged at the front side of the top end of the top plate.

9. The boiler tail waste heat utilization system according to claim 8, characterized in that: A drainage pipe is arranged on the other side of the top of the top plate, and the bottom end of the drainage pipe passes through the top plate and is close to the inner bottom end of the outer cylinder.

10. The boiler tail waste heat utilization system according to claim 1, characterized in that: The top end of the collecting tube is in an outwardly expanding trumpet shape, and a support arm is welded between the outer wall of the collecting tube and the two groups of guide tubes.

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