CN115046210A

CN115046210A - Heat dissipation recovery device of solid waste incinerator

Info

Publication number: CN115046210A
Application number: CN202210734928.7A
Authority: CN
Inventors: 蒋龙进; 孙霄峰; 张传军; 葛仕福
Original assignee: Anhui Chaoyue Environmental Protection Technology Co ltd; Southeast University
Current assignee: Anhui Chaoyue Environmental Protection Technology Co ltd; Southeast University
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-09-13

Abstract

The invention relates to a device for economically and efficiently recovering heat radiation of a solid waste incinerator, which consists of heating pipes, a partition plate, a heating pipe row support ring, a water inlet main pipe and a water outlet main pipe, wherein a plurality of heating pipe row support ring inner walls which are tightly attached to the heating pipes are fixed to form a circular heating pipe row, the heating pipe row is concentric with an incinerator shell, each heating pipe is axially parallel to the incinerator shell, a heat insulation layer and an outer cover are arranged outside the heating pipe row, and the heating pipe row support ring are fixed on a heating pipe support foot. The invention adopts the water inlet main pipe and the water return main pipe, when the heating pipes are welded, the main pipe is firstly split, and a group of heating pipes which are close to each other can be conveniently welded on the side of the main pipe, so that the gap between the heating pipes is greatly reduced.

Description

Heat dissipation recovery device of solid waste incinerator

Technical Field

The invention relates to the field of energy conservation of solid waste incinerators, in particular to a heat dissipation and recovery device of a solid waste incinerator.

Background

The existing solid waste incineration kiln has high temperature of the outer shell, wastes heat energy, utilizes the solid waste incineration heat dissipation recovery technology for energy conservation and emission reduction, can recover heat to heat the water supply of the incinerator waste heat boiler, increases steam capacity, or is used for hot water supply and heating, saves a large amount of conventional heat supply energy, recovers heat energy, reduces heat radiation around the kiln, improves the operating environment of workers, and also meets the requirement of carbon reduction.

At present, the kiln cylinder surface heat dissipation recycling device in China is mainly characterized in that:

1. the efficiency of heat dissipation and recycling of the surface of the kiln cylinder is not high; as can be known from the patent application with application number CN201721501789.4 and name of a waste incinerator capable of recovering heat, in order to enhance the heat transfer coefficient of water in the pipe, the flow velocity of water in the pipe is usually increased, and a plurality of heating pipes are connected in series, and because the pipes need to be welded with elbows in series, a certain gap must be left between the pipes, and the zigzag design increases the floor area and affects the arrangement of the heating surface.

2. The grade of heat generated by the device is not high; in the heat dissipation recovery pipe, heat transfer between water and the pipe wall is to heat water by the pipe wall, and heat transfer resistance between the water and the pipe wall is large, so that heat transfer temperature difference between the water and the pipe wall is increased, the rising range of water temperature is influenced, and the grade of hot water heat generated by the existing device is not high.

3. The arrangement of the heat dissipation and recovery device on the surface of the kiln cylinder improves the surface temperature of the kiln and reduces the strength of the kiln cylinder.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the heat dissipation and recovery device of the solid waste incinerator solves the existing problems, and is good in heat recovery effect, high in heat transfer coefficient of water in the incinerator and pipe walls, and large in heat recovery area.

The invention provides the following technical scheme: a solid waste incinerator heat dissipation recovery unit comprises a heating pipe arranged outside an incinerator shell; the inner tube of the heating tube is divided into an outer heating tube and an inner heating tube by a partition plate;

the partition plate is provided with a through hole;

one end of the external heating pipe is communicated with the water inlet main pipe, and the other end of the external heating pipe is closed;

one end of the internal heating pipe is communicated with the water return main pipe, and the other end of the internal heating pipe is closed;

and after the fluid in the water inlet main pipe flows into the external heating pipe, the fluid enters the internal heating pipe through the through hole and then flows back to the water return main pipe.

Furthermore, the heating pipes are arranged along the length direction of the incinerator shell, and a plurality of groups of heating pipes are uniformly arranged along the circumferential direction of the incinerator shell to form a heating pipe row arranged on the outer side of the incinerator shell.

Furthermore, the water inlet main pipe and the water return main pipe are respectively arranged on two sides of the incinerator shell.

Further, a shell fin ring is arranged on the outer end face of the incinerator shell; the shell fin ring comprises a plurality of fins which are uniformly arranged.

Furthermore, a heat insulation layer is arranged at the end of the external heating pipe, which is far away from the incinerator shell.

Furthermore, the heating pipe coil is fixed on the heating pipe supporting leg through the heating pipe row supporting ring.

Furthermore, the closed end of the external heating pipe is close to the return water main pipe; the closed end of the inner heating pipe is close to the water inlet main pipe.

Furthermore, the water inlet main pipe and the water return main pipe are both annular and concentric with the incinerator shell.

Further, a water storage tank is arranged at the water outlet end of the water return main pipe; the position of the water storage tank is higher than the highest point of the heating pipe row.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention adopts the water inlet main pipe and the water return main pipe, when the heating pipes are welded, the main pipe is firstly split, and a group of heating pipes which are close to each other can be conveniently welded on the side of the main pipe, so that the gap between the heating pipes is greatly reduced.

2. The heating pipe is arranged close to the incinerator shell, so that the heat dissipation recovery area of the surface of the incinerator shell is increased; in order to increase the area of the heating pipes, the arrangement mode of the heating pipes is parallel arrangement, the flow velocity in the heating pipes is lower, the heat transfer coefficient is small, and in order to overcome the defect, a special water flow device is invented, flows into an external heating cavity of the heating pipes from a water inlet main pipe, flows into an internal heating cavity through small holes, and then flows into a water return main pipe; meanwhile, the flowing state of water in the pipe is laminar flow, and the heat transfer coefficient between the water and the pipe wall is in direct proportion to the flow velocity, so that the flow velocity is increased, the heat transfer coefficient can be increased by about 40%, and a heat transfer pipeline can be saved by about 40% when the heat transfer quantity is the same.

3. In order to reduce natural heat transfer or radiation heat transfer of the incinerator to the external environment, the heat radiation of the incinerator is completely used for heating hot water as far as possible, the outer side of the external heating pipe back to the outer surface of the incinerator is provided with a heat insulation layer, and heat energy loss is further reduced by adopting heat insulation measures.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic view of a specific structure of a heating tube according to the present invention;

FIG. 4 is a cross-sectional view taken along line C-C of FIG. 1;

FIG. 5 is a cross-sectional view taken along line D-D of FIG. 1;

FIG. 6 is a schematic view of the overall structure of a water inlet main pipe and a water return main pipe according to the present invention;

FIG. 7 is a schematic view of the fluid flow between the inlet header and the return header of the present invention;

fig. 8 is a schematic flow direction diagram of the whole inlet and outlet of the fluid of the water inlet main pipe and the water return main pipe.

The direction of the arrows in the figure is the direction of fluid flow.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be more clearly and completely described below with reference to the accompanying drawings in the examples of the present invention.

Fig. 1 and fig. 3 show a specific embodiment of the present invention: comprises a heating pipe 61 arranged outside the incinerator shell 3; a shell fin ring 4 is arranged on the outer end face of the incinerator shell 3; the housing fin collar 4 comprises a plurality of fins arranged uniformly. The heating pipe 61 is internally divided into an outer heating pipe 62 and an inner heating pipe 63 by a partition plate 5; the end of the external heating pipe 62 far away from the incinerator shell 3 is provided with an insulating layer 8. The water inlet main pipe 2 and the water return main pipe 10 are respectively arranged at two sides of the incinerator shell 3. The partition board 5 is provided with a through hole 51; one end of the external heating pipe 62 is communicated with the water inlet main pipe 2, and the other end is closed; one end of the internal heating pipe 63 is communicated with the water return main pipe 10, and the other end is closed; after the fluid in the water inlet main pipe 2 flows into the external heating pipe 62, the fluid enters the internal heating pipe 63 through the through hole 51 and then flows back to the water return main pipe 10. The closed end of the external heating pipe 62 is close to the water return main pipe 10; the closed end of the inner heating pipe 63 is close to the water inlet main pipe 2. The water inlet main pipe 2 and the water return main pipe 10 are both annular and concentric with the incinerator shell 3. A water storage tank 12 is arranged at the water outlet end of the water return main pipe 10; the storage tank 12 is located above the highest point of the heating line 6. The heating pipes 61 are arranged along the length direction of the incinerator housing 3, and a plurality of groups of heating pipes 61 are uniformly arranged along the circumferential direction of the incinerator housing 3 to form a heating pipe row 6 arranged outside the incinerator housing 3. The heating tube coil 6 is fixed on the heating tube supporting legs 13 through the heating tube row supporting ring 7.

Wherein the heating tube bank 6 is spaced from the incinerator housing 3 by 50mm to 200 mm.

Because the temperature of the outer shell of the middle incinerator is high, heat is transferred to the wall of the water flow pipe through radiation and then transferred to water through the pipe wall, and therefore the heat transfer surface subjected to radiation is called a radiation heating surface. The radiant heating pipe faces to the radiation heating surface of the incinerator shell, is used for heating hot water as completely as possible in order to reduce natural heat transfer or radiation heat transfer of the radiant heating pipe to the external environment, and adopts a heat preservation measure for the radiant heating pipe back to the incinerator shell surface.

Fluid enters a water inlet main pipe 2 from a water inlet main pipe 1, and the water inlet main pipe 2 is in an annular structure and is concentric with an incinerator shell 3; the fluid flows into the outer heating pipe 62 of each heating pipe 61 in the heating pipe row 6 through the water inlet main pipe 2; the fluid in the outer heating pipe 62 passes through the through hole 51 of the partition plate 5 in the heating pipe 61, and the fluid rapidly flows into the inner heating pipe 63 and performs impact heat transfer on the radiation heating surface of the heating pipe 61; after heat exchange by the internal heating pipe 63, the water flows into the water return main pipe 10 and enters the water storage tank 12 through the water outlet, the lowest end of the water storage tank 12 can be connected with the water inlet main pipe 1, and water in the water storage tank 12 is circularly heated and can be utilized after reaching a certain temperature.

The position of the water storage tank 12 is higher than the highest point of the heating tube row 6, the liquid level of the water storage tank 12 is controlled, and it is ensured that each heating tube 61 is filled with water, so as to protect the safe and stable operation of the heating tube row 6.

As shown in figure 6, the invention adopts the inlet water and return water main pipes, when the heating pipes are welded, the main pipes are firstly cut open, a group of heating pipes which are close to each other can be conveniently welded on the side of the main pipes, the gaps among the heating pipes are greatly reduced, and compared with the arrangement of the existing heating pipes, the heating surface can be increased by more than one time under the condition of the same kiln surface area.

Secondly, the invention adopts a special water flow design to improve the heat transfer coefficient between the fluid in the pipe and the pipe wall.

In order to increase the area of the heating pipes, the arrangement mode of the heating pipes is parallel arrangement, the flow velocity in the heating pipes is lower, the heat transfer coefficient is small, and in order to overcome the defect, a special water flow device is invented, as shown in fig. 7, the water flows into the outer heating pipe 62 of the heating pipe from the water inlet main pipe, flows into the inner heating pipe 63 through the small hole, and then flows into the water return main pipe, on one hand, a middle partition plate is arranged, the sectional area is reduced by half, and the flow velocity is doubled; the flowing state of water in the pipe is laminar flow, and the heat transfer coefficient between water and the pipe wall is in direct proportion to the flow velocity, so that the flow velocity is increased, the heat transfer coefficient can be increased by about 40%, and the heat transfer pipeline can be saved by about 40% when the heat transfer quantity is the same.

On the other hand, the through-hole 51 is provided so that the water flow flowing into the inner-heating pipe 63 directly hits the radiant heating surface while disturbing the water flow state of the inner-heating pipe 63.

Through the design, the heat transfer coefficient between the water in the tube and the radiation heating surface is greatly improved.

Finally, a group of shell fin rings 4 with short and thin fins are additionally arranged on the incinerator shell 3, so that the surface temperature of the kiln is reduced, and the strength of the kiln cylinder is greatly increased.

As shown in fig. 8, the casing fin ring 4 is additionally arranged on the incinerator casing 3 in a bolt connection mode, so that the heating surface of the incinerator casing is greatly increased, the temperature of the incinerator casing can be reduced, and the reduction of the strength of a furnace body of the incinerator due to the increase of the surface temperature caused by the arrangement of a heat dissipation recovery device is compensated.

Because the heat is transferred from the incinerator shell, when the shell fin ring 4 is not added, the heat transfer area is the area of the incinerator shell 3, the shell fin ring 4 is added, the heat can be radiated from the shell fin ring 4 to the heating surface, and the heat transfer area is obviously increased. Here, the heat transfer area is preferably used, and generally, heat dissipation means wasted heat.

Under the condition of the same heat transfer quantity, the heat transfer coefficient is the same, the heat transfer area is increased, and the heat transfer temperature difference is reduced, namely: the temperature difference between the incinerator shell and the radiation heating surface is reduced, the temperature of the radiation heating surface is controlled by the water temperature, and a determined temperature is usually kept, so that the temperature difference between the incinerator shell 3 and the radiation heating surface is reduced, namely the temperature of the incinerator shell is reduced.

The above embodiments are merely illustrative of the technical concept and structural features of the present invention, and are intended to be implemented by those skilled in the art, but the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should fall within the scope of the present invention.

Claims

1. The utility model provides a gu useless burning furnace heat dissipation recovery unit, its characterized in that: comprises a heating pipe (61) arranged outside an incinerator shell (3); the heating pipe (61) is internally divided into an outer heating pipe (62) and an inner heating pipe (63) through a partition plate (5);

the partition plate (5) is provided with a through hole (51);

one end of the external heating pipe (62) is communicated with the water inlet main pipe (2), and the other end is closed;

one end of the internal heating pipe (63) is communicated with the water return main pipe (10), and the other end is closed;

and after the fluid in the water inlet main pipe (2) flows into the external heating pipe (62), the fluid enters the internal heating pipe (63) through the through hole (51) and then flows back to the water return main pipe (10).

2. The solid waste incinerator heat recovery unit as claimed in claim 1, wherein: the heating pipes (611) are arranged along the length direction of the incinerator shell (3), and a plurality of groups of heating pipes (61) are uniformly arranged along the circumferential direction of the incinerator shell (3) to form a heating pipe row (6) arranged on the outer side of the incinerator shell (3).

3. The solid waste incinerator heat recovery unit as claimed in claim 1, wherein: the water inlet main pipe (2) and the water return main pipe (10) are respectively arranged on two sides of the incinerator shell (3).

4. The solid waste incinerator heat recovery unit as claimed in claim 1, wherein: the outer end surface of the incinerator shell (3) is provided with a shell fin ring (4); the shell fin ring (4) comprises a plurality of fins which are uniformly arranged.

5. The solid waste incinerator heat recovery unit as claimed in claim 1, wherein: and a heat-insulating layer (8) is arranged at the end of the external heating pipe (62) far away from the incinerator shell (3).

6. The solid waste incinerator heat recovery unit of claim 5, characterized by: the heating pipe coil (6) is fixed on the heating pipe supporting legs (13) through the heating pipe row supporting ring (7).

7. The solid waste incinerator heat recovery unit of claim 3, characterized by: the closed end of the external heating pipe (62) is close to the water return main pipe (10); the closed end of the inner heating pipe (63) is close to the water inlet main pipe (2).

8. The solid waste incinerator heat recovery apparatus as claimed in any one of claims 1 to 7, wherein: the water inlet main pipe (2) and the water return main pipe (10) are both annular and concentric with the incinerator shell (3).

9. The solid waste incinerator heat recovery unit as claimed in claim 2, wherein: a water storage tank (12) is arranged at the water outlet end of the water return main pipe (10); the position of the water storage tank (12) is higher than the highest point of the heating pipe row (6).