CN216205376U

CN216205376U - Waste heat recovery device for rotary kiln barrel

Info

Publication number: CN216205376U
Application number: CN202122395825.6U
Authority: CN
Inventors: 李明辉; 李俊; 关艳艳
Original assignee: Yantai Zhongneng Environmental Technology Co ltd
Current assignee: Yantai Zhongneng Environmental Technology Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-04-05
Anticipated expiration: 2031-09-30

Abstract

A waste heat recovery device for a rotary kiln barrel relates to the technical field of waste heat recovery devices, and comprises a kiln head and a kiln tail, wherein the kiln barrel is arranged between the kiln head and the kiln tail, the outer side of the kiln barrel is coated with the waste heat recovery device, the waste heat recovery device is formed by arranging a plurality of heat collectors around the kiln barrel, the heat collectors are water-cooling wall groups formed by splicing six water-cooling wall tube bundles, two adjacent water-cooling wall tube bundles are communicated through a water collecting pipe, the six water-cooling wall tube bundles are divided into two groups, each group comprises three water-cooling wall tube bundles, the two water-cooling wall tube bundles are symmetrically arranged on the left side and the right side of the kiln barrel, the lower ends of the water-cooling wall groups are water-cooling wall group outlets, the upper ends of the water-cooling wall group are water-cooling wall group inlets, snakelike tube bundles are connected to the upper ends of the water-cooling wall groups, the upper ends of the snakelike tube bundles are snakelike tube bundle inlets, and the lower ends of the snakelike tube bundle outlets, the outer surface of the kiln barrel is enabled to generate air flow through a fan, the heat is recycled, and the economic benefit is improved.

Description

Waste heat recovery device for rotary kiln barrel

Technical Field

The utility model relates to the technical field of waste heat recovery devices, in particular to a waste heat recovery device for a rotary kiln cylinder.

Background

In the production of cement industry, the energy consumption and energy loss of the rotary kiln account for more total energy consumption of the production line, and the rotary kiln has greater potential of energy conservation and consumption reduction. For the rotary kiln equipment, the high temperature of radiation can cause the rise of the temperature of a riding wheel tile and influence the production; for operation maintenance personnel, especially in summer, the continuous high temperature at the periphery of the kiln barrel greatly increases the operation risk of the operation maintenance personnel. Therefore, the high-efficiency control of the low-grade waste heat of the rotary kiln cylinder becomes an important research subject of energy conservation and consumption reduction in cement production. Through the effective collection to the kiln body heat dissipation, can improve enterprise energy consumption management level and production level, greatly improve enterprise's productivity effect.

The waste heat recovery research of the rotary cement kiln body belongs to the starting stage at home, and few enterprises developing related projects are available at present. There are many ways for recycling the heat radiation of the rotary kiln cylinder, but no good method for utilizing the heat radiation of the rotary kiln cylinder exists in the cement industry so far. In some cement plants in the north and the domestic, a heat insulation cover is arranged at a part (a burning zone or a transition zone near a kiln head) with higher temperature on the surface of a kiln cylinder body, hot water is prepared by utilizing the heat dissipation of the cylinder body and is used for heating and bathing in winter, and after the heating season is over and in areas without heating requirements, the consumption of hot water is greatly reduced, so that the waste of energy is caused.

The defects of the old heat exchanger are as follows: 1. the old heat exchanger is mostly arranged in a structure form of adopting uniform pipe distribution along the axial direction of the rotary kiln, however, the heat dissipation capacity of the surface of the rotary kiln along the axial unit length is not uniform, and large difference exists, so that the heat collection efficiency is too low. 2. The old heat exchange device can only be used for heating in winter or combined with a lithium bromide unit, so that the heat is generated in summer, the waste heat utilization value is low, the universality is not realized, and the old heat exchange device is not suitable for certain areas which do not need heating and refrigeration.

SUMMERY OF THE UTILITY MODEL

In view of the defects of the prior art, the utility model aims to provide a waste heat recovery device for a rotary kiln cylinder, which can solve the following problems: 1. the old heat exchanger is mostly arranged in a structure form of uniformly distributing pipes along the axial direction of the rotary kiln, however, the heat dissipating capacity of the surface of the rotary kiln along the axial unit length is not uniform, and the heat dissipating capacity has large difference, so that the heat collecting efficiency is too low; 2. the old heat exchange device can only be used for heating in winter or be used with a lithium bromide unit, so that the heat is generated in summer, the waste heat utilization value is low, the universality is not realized, and the technical problem that the old heat exchange device is inapplicable in certain areas without heating and refrigerating is solved.

In order to achieve the above purpose, the utility model provides the following technical scheme:

the utility model provides a waste heat recovery device for rotary kiln barrel, includes kiln head and kiln tail, be provided with the kiln barrel between kiln head and the kiln tail, the cladding of kiln barrel outside has waste heat recovery device, waste heat recovery device is formed by a plurality of heat collectors around the kiln barrel arranges, a plurality of heat collectors are arranged along the axial order of kiln barrel, the heat collector is the water-cooling wall group that is formed by six water-cooling wall tube bank concatenations, communicate through the collector pipe between two adjacent water-cooling wall tube banks, six water-cooling wall tube banks divide into two sets ofly, and three of every group, two sets of water-cooling wall tube bank symmetries set up the left and right sides at the kiln barrel, the lower extreme of water-cooling wall group is water-cooling wall group export, and the upper end is water-cooling wall group entry, water-cooling wall group upper end is connected with snakelike tube bank, snakelike tube bank's upper end is snakelike tube bank entry, and the lower extreme is snakelike tube bank export, and the outlet of the serpentine tube bundle is communicated with the inlet of the water-cooling wall group.

Preferably, an air flow channel is arranged between the water cooling wall group and the kiln barrel, and a fan is arranged at the bottom of the water cooling wall group.

Further, in the technical scheme, the fan can enable air to flow from bottom to top, and hot air exchanges heat between the tube bundle sections of the water-cooled walls and then exchanges heat between the tube bundle sections of the coiled tubes.

Preferably, a steel frame is arranged on the outer side of the heat collector, the heat collector is connected to the steel frame, and reinforcing ribs are arranged at the right-angle joint of the steel frame.

Preferably, the outer side of the serpentine tube bundle is provided with a serpentine tube shell.

Preferably, a water-cooling wall group shell is arranged on the outer side of the water-cooling wall group and fixedly connected with the steel frame.

Preferably, the heat transfer medium contained within the waterwall tube bundle and serpentine tube bundle is water.

Preferably, the outlet of the water-cooling wall group is connected with a water return pipe, one end of the water return pipe, which is far away from the outlet of the water-cooling wall group, is connected with the inlet of the serpentine tube bundle to form a circulating pipeline, and the water return pipe is connected with an ORC power generation system.

Compared with the prior art, the utility model has the beneficial effects that:

1. aiming at different temperature intervals of the rotary kiln barrel, the heat taking device is independently arranged, so that the heat collection efficiency is maximized.

2. Can produce low-pressure steam, and can be used for generating power by being combined with an ORC power generation system, so that the waste heat benefit is maximized.

3. And the assembly is modularized, so that the installation and the maintenance are convenient.

4. The device has small volume and compact arrangement.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

FIG. 1 is a schematic diagram of the overall structure of a waste heat recovery device for a rotary kiln cylinder according to the present invention;

FIG. 2 is a structural diagram of a radiator of the waste heat recovery device for the rotary kiln cylinder provided by the utility model;

fig. 3 is a layout diagram of a heat collector of the waste heat recovery device for the rotary kiln cylinder provided by the utility model.

Description of reference numerals:

the system comprises a kiln head 1, a kiln tail 2, a kiln barrel 3, a heat collector 4, a water wall tube bundle 5, a water wall group 6, a water wall group 7, a water wall group inlet 8, a serpentine tube bundle 9, a serpentine tube bundle 10, a serpentine tube bundle outlet 11, a fan 12, a steel frame 13, a reinforcing rib 13, a serpentine tube shell 14, a water wall group shell 15, a water return pipe 16 and an ORC (organic Rankine cycle) power generation system 17.

Detailed Description

The utility model will be described in detail by way of example with reference to the accompanying drawings, which form a part hereof, and in which it is to be understood that the described embodiments are by way of illustration only, and not by way of limitation.

As shown in fig. 1-3, the waste heat recovery device for the rotary kiln cylinder comprises a kiln head 1 and a kiln tail 2, wherein a kiln cylinder 3 is arranged between the kiln head 1 and the kiln tail 2, and the outer side of the kiln cylinder 3 is coated with the waste heat recovery device.

In this embodiment, the waste heat recovery device is formed by arranging a plurality of heat collectors 4 around kiln barrel 3, 4 outsides of heat collectors are provided with steel frame 12 that is used for supporting heat collectors 4, heat collectors 4 connect on steel frame 12, the right angle junction of steel frame 12 is provided with strengthening rib 13, strengthening rib 13 plays the effect of further fixed steel frame 12, and this strengthening rib 13 can be the reinforcement of multiple forms such as reinforcing bar or steel sheet. A plurality of heat collectors 4 are arranged along kiln barrel 3's axial order, heat collector 4 is the water-cooling wall group that forms by the concatenation of six water-cooling wall tube bundles 5, the water-cooling wall group outside is equipped with water-cooling wall group shell 15, water-cooling wall group shell 15 is used for protecting water-cooling wall group, water-cooling wall group shell 15 and steelframe 12 fixed connection. The kiln comprises a kiln body 3, and is characterized in that the two adjacent water-cooled wall tube bundles 5 are communicated with each other through a water collecting pipe, the six water-cooled wall tube bundles 5 are divided into two groups, each group comprises three water-cooled wall tube bundles, the two groups of water-cooled wall tube bundles 5 are symmetrically arranged on the left side and the right side of the kiln body 3, an air flow channel is arranged between the water-cooled wall tube bundles and the kiln body 3, a fan 11 is arranged at the bottom of the water-cooled wall tube bundles, the fan 11 enables air to flow from bottom to top, hot air firstly exchanges heat between the water-cooled wall tube bundles 5 and then exchanges heat between the snakelike tube bundles 8. The lower extreme of waterwall group is waterwall group export 6, and the upper end is waterwall group entry 7, waterwall group upper end is connected with snakelike tube bank 8, snakelike tube bank 8 outside is equipped with snakelike tube shell 14. The upper end of the serpentine tube bundle 8 is a serpentine tube bundle inlet 9, the lower end of the serpentine tube bundle is a serpentine tube bundle outlet 10, and the serpentine tube bundle outlet 10 is communicated with the water-cooling wall group inlet 7. The heat transfer medium contained within the waterwall tube bundle 5 and serpentine tube bundle 8 is water.

The outlet 6 of water-cooling wall group is connected with wet return 16, wet return 16 keeps away from the one end of water-cooling wall group outlet 6 and is connected with snakelike tube bank entry 9 and forms the circulating line, be connected with ORC power generation system 17 on the wet return 16, the water absorbs the radiant energy that this waste heat recovery device obtained through the heat convection mode, prepares life, heating as required and uses hot water. During power generation, hot water enters the water return pipe 16 through the water cooling wall group outlet 6, power generation is carried out through the OR power generation system 17, the hot water is changed into cold water after power generation, the cold water enters the snake-shaped tube bundle 8 through the water return pipe 16 again, circulation is formed, and the purpose of waste heat recovery and reutilization is achieved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the application concepts of the present invention are equivalent to or changed within the technical scope of the present invention.

Claims

1. The utility model provides a waste heat recovery device for rotary kiln barrel, includes kiln head (1) and kiln tail (2), be provided with kiln barrel (3) between kiln head (1) and kiln tail (2), the cladding of kiln barrel (3) outside has waste heat recovery device, waste heat recovery device is arranged around kiln barrel (3) by a plurality of heat collectors (4) and forms, the axial of kiln barrel (3) is arranged its characterized in that in proper order along a plurality of heat collectors (4): heat collector (4) are the waterwall group that is formed by six waterwall tube bundles (5) concatenation, adjacent two communicate through the collector pipe between waterwall tube bundles (5), six waterwall tube bundles (5) divide into two sets ofly, and every group is three, and two sets of waterwall tube bundles (5) symmetry set up the left and right sides at kiln barrel (3), the lower extreme of waterwall group is waterwall group export (6), and the upper end is waterwall group entry (7), waterwall group upper end is connected with snakelike tube bank (8), the upper end of snakelike tube bank (8) is snakelike tube bank entry (9), and the lower extreme is snakelike tube bank export (10), snakelike tube bank export (10) are linked together with waterwall group entry (7).

2. The waste heat recovery device for the cylinder of the rotary kiln as claimed in claim 1, wherein: an air flow channel is arranged between the water cooling wall group and the kiln barrel body (3), and a fan (11) is arranged at the bottom of the water cooling wall group.

3. The waste heat recovery device for the cylinder of the rotary kiln as claimed in claim 1, wherein: a steel frame (12) is arranged on the outer side of the heat collector (4), the heat collector (4) is connected to the steel frame (12), and reinforcing ribs (13) are arranged at the right-angle connection positions of the steel frame (12).

4. The waste heat recovery device for the cylinder of the rotary kiln as claimed in claim 1, wherein: and a snake-shaped pipe shell (14) is arranged on the outer side of the snake-shaped pipe bundle (8).

5. The waste heat recovery device for the cylinder of the rotary kiln as claimed in claim 1, wherein: the outer side of the water-cooling wall group is provided with a water-cooling wall group shell (15), and the water-cooling wall group shell (15) is fixedly connected with the steel frame (12).

6. The waste heat recovery device for the cylinder of the rotary kiln as claimed in claim 1, wherein: the heat transfer medium contained in the waterwall tube bundle (5) and the serpentine tube bundle (8) is water.

7. The waste heat recovery device for the cylinder of the rotary kiln as claimed in claim 1, wherein: water cooling wall group export (6) are connected with wet return (16), wet return (16) are kept away from the one end of water cooling wall group export (6) and are connected with snakelike tube bank entry (9) and form circulation line, be connected with ORC power generation system (17) on wet return (16).