CN212777270U

CN212777270U - Rotary calcining kiln waste heat boiler

Info

Publication number: CN212777270U
Application number: CN201921861235.4U
Authority: CN
Inventors: 刘祥斌; 林仟国; 程立春; 陈长景
Original assignee: Jiangsu Dongjiu Heavy Industry Co ltd
Current assignee: Jiangsu Dongjiu Heavy Industry Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2021-03-23
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses a rotary calcining kiln waste heat boiler, which comprises a heat exchange tube group, wherein the heat exchange tube group is composed of a plurality of heat exchange unit rows and is arranged outside along the circumferential direction of the axis of a rotary calcining kiln barrel body through a framework, the bottom end of the heat exchange unit is provided with a heat transfer medium inlet, and the top end of the heat exchange unit is provided with a heat transfer medium outlet; the heat transfer medium inlet is communicated with the centralized descending pipe, and the heat transfer medium outlet is communicated with the centralized ascending pipe; the centralized downcomer is provided with a circulating water pump, and a forced steam-water circulation loop is formed by a pressure head provided by the circulating water pump, the heat exchange tube group, the steam pocket, the centralized riser and the centralized downcomer. The utility model provides a waste of heat energy resources's problem in rotatory calcining kiln production process.

Description

Rotary calcining kiln waste heat boiler

Technical Field

The utility model relates to a waste heat boiler, more specifically relate to a rotatory calcining kiln waste heat boiler.

Background

A rotary calcining kiln, commonly called a rotary kiln or a rotary kiln, is widely used for mechanical, physical or chemical treatment of solid materials in various production industries such as building materials, metallurgy, chemical engineering, environmental protection and the like, and is high-energy-consumption industrial equipment. The surface temperature of the cylinder body is 250-450 ℃ when the rotary calcining kiln operates, and the total heat dissipation loss of the surface of the cylinder body is 10465-34324 Kilojoules (KJ)/square meter (m)²) And h, blowing (air cooling) the surface of the rotary kiln cylinder by using an air blower in the production process for cooling, wherein the heat is not fully recovered and effectively utilized, and the air blower generates extra power consumption during working.

In the production process of the rotary calcining kiln, a large amount of heat energy resources are wasted, and meanwhile, the heat pollution of the surrounding environment is caused. The realization of effective recovery of the surface heat of the rotary calcining kiln cylinder body through modern industrial equipment is a practical subject commonly faced by the rotary calcining kiln application industry, and is an effective way for realizing comprehensive utilization of energy resources and energy conservation and efficiency creation of the rotary calcining kiln application industry.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a rotary calcining kiln exhaust-heat boiler, this rotary calcining kiln exhaust-heat boiler has solved the problem of the waste of heat energy resource in the rotary calcining kiln production process.

In order to achieve the above purpose, the present invention adopts the following technical solutions:

a rotary calcining kiln waste heat boiler comprises a heat exchange tube group, wherein the heat exchange tube group is composed of a plurality of heat exchange unit rows and is arranged on the circumferential outer part along the axis of a rotary calcining kiln cylinder body through a framework, the bottom end of each heat exchange unit is provided with a heat transfer medium inlet, and the top end of each heat exchange unit is provided with a heat transfer medium outlet; the heat transfer medium inlet is communicated with the centralized descending pipe, and the heat transfer medium outlet is communicated with the centralized ascending pipe; the centralized downcomer is provided with a circulating water pump, and a forced steam-water circulation loop is formed by a pressure head provided by the circulating water pump, the heat exchange tube group, the steam pocket, the centralized riser and the centralized downcomer.

Further, the heat exchange unit comprises two groups of heat exchange modules which are symmetrical left and right, and the heat exchange modules are independently connected with the centralized ascending pipe and the centralized descending pipe.

Further, the heat exchange module comprises two groups of heat exchangers which are connected together through flanges and are symmetrical up and down; the heat exchanger comprises an inlet header, an outlet header and a plurality of heat transfer surface tube bundles, wherein the heat transfer surface tube bundles are assembled with the inlet header and the outlet header to form an arc-shaped tube group.

Furthermore, the heat transfer surface tube bundle of the upper group of heat exchangers is a spiral finned tube, and the heat transfer surface tube bundle of the lower group of heat exchangers is a light pipe.

Furthermore, the inner arc surface of the heat exchanger points to the circle center of the section of the rotary calcining kiln and covers the outer wall of the rotary calcining kiln by equidistant covers.

Furthermore, the circulating water pump adopts a variable-frequency driving device.

Adopt the utility model discloses technical scheme's rotatory calcining kiln exhaust-heat boiler through establishing the heat exchange nest of tubes on rotatory calcining kiln circumference surface, has reduced the wall temperature of rotatory calcining kiln barrel, has reduced the thermal pollution of rotatory calcining kiln surrounding environment, has reduced rotatory calcining kiln fortune dimension cost, has improved rotatory calcining kiln operating efficiency. The energy is saved, the emission is reduced, the effect is created, the surrounding environment of the rotary calcining kiln is improved, and the economic benefit and the environmental protection benefit are better.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of a heat exchange unit configuration;

in the figure: 1. the heat exchange device comprises a heat exchange tube group, a heat exchange unit 2, a heat transfer medium inlet 3, a heat transfer medium outlet 4, a concentrated downcomer 5, a concentrated ascending tube 6, a circulating water pump 7, a steam pocket 8, a heat exchange module 9, an upper arc-shaped heat exchanger 10, a lower arc-shaped heat exchanger 11, a rotary calcining kiln 12 and a framework 13.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The relative arrangement of the components and steps, expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented in other different ways (rotated 90 degrees or at other orientations).

As shown in fig. 1 and 2, the waste heat boiler of the rotary calcining kiln of the present invention comprises a heat exchange tube group 1, wherein the heat exchange tube group 1 is composed of a plurality of heat exchange units 2, and is arranged outside along the circumferential direction of the axis of the rotary calcining kiln barrel 12 through a frame 13, the bottom end of each heat exchange unit 2 is provided with a heat transfer medium inlet 3, and the top end is provided with a heat transfer medium outlet 4; the heat transfer medium inlet 3 is communicated with a centralized downcomer 5, and the heat transfer medium outlet 4 is communicated with a centralized riser 6; the centralized downcomer 5 is provided with a circulating water pump 7, and a forced steam-water circulation loop is formed by the heat exchange tube group 1, the steam pocket 8, the centralized ascending tube 6 and the centralized downcomer 5 through a pressure head provided by the circulating water pump 7.

The heat exchange unit 2 is composed of two groups of heat exchange modules 9 which are bilaterally symmetrical, and the heat exchange modules 9 are independently connected with the centralized ascending pipe 6 and the centralized descending pipe 5.

The heat exchange module 9 is formed by connecting two groups of heat exchangers which are symmetrical up and down through flanges; the heat exchanger comprises an inlet header, an outlet header and a plurality of heat transfer surface tube bundles, wherein the heat transfer surface tube bundles are assembled with the inlet header and the outlet header to form an arc-shaped tube group.

The heat transfer surface tube bundle of the upper group of arc-shaped heat exchangers 10 is a spiral finned tube, and the heat transfer surface tube bundle of the lower group of arc-shaped heat exchangers 11 is a light tube.

The arc-shaped heat exchanger inner arc faces the center of the cross section of the rotary calcining kiln 12 and covers the outer wall of the rotary calcining kiln with equidistant covers.

The circulating water pump 7 adopts a variable-frequency driving device.

When the rotary calcining kiln waste heat boiler operates, feed water enters the steam drum 8, a steam-water mixture generated by the heat exchange tube group 1 passes through a pressure head provided by the circulating water pump 7 and forms a forced steam-water circulation loop with the steam drum 8 through the centralized ascending tube 6 and the centralized descending tube 5, and saturated steam is generated in the steam drum 8 and is sent to a steam pipe network for production and living.

Claims

1. A rotary calcining kiln waste heat boiler comprises a heat exchange tube group and is characterized in that the heat exchange tube group is composed of a plurality of heat exchange unit rows, the heat exchange tube group is arranged on the circumferential outer part along the axis of a rotary calcining kiln cylinder body through a framework, the bottom end of each heat exchange unit is provided with a heat transfer medium inlet, and the top end of each heat exchange unit is provided with a heat transfer medium outlet; the heat transfer medium inlet is communicated with the centralized descending pipe, and the heat transfer medium outlet is communicated with the centralized ascending pipe; the centralized downcomer is provided with a circulating water pump, and a forced steam-water circulation loop is formed by a pressure head provided by the circulating water pump, the heat exchange tube group, the steam pocket, the centralized riser and the centralized downcomer.

2. The rotary calciner exhaust heat boiler according to claim 1, wherein the heat exchange unit comprises two sets of heat exchange modules in bilateral symmetry, the heat exchange modules being independently connected to a centralized riser and a centralized downcomer.

3. A rotary calciner exhaust heat boiler according to claim 2, characterized in that the heat exchange module comprises two sets of heat exchangers which are symmetrical up and down and are connected together by flanges; the heat exchanger comprises an inlet header, an outlet header and a plurality of heat transfer surface tube bundles, wherein the heat transfer surface tube bundles are assembled with the inlet header and the outlet header to form an arc-shaped tube group.

4. The rotary calciner exhaust-heat boiler according to claim 3, characterized in that the two heat exchangers of the heat exchange module are symmetrical up and down, the heat transfer surface tube bundle of the heat exchanger at the upper position is a spiral finned tube, and the heat transfer surface tube bundle of the heat exchanger at the lower position is a light pipe.

5. A rotary calciner exhaust heat boiler according to claim 3, characterized in that the intrados of the heat exchanger points towards the centre of the rotary calciner cross-section and is shrouded equidistantly on the outer wall of the rotary calciner.

6. A rotary calciner exhaust heat boiler according to claim 1, characterized in that the circulating water pump is a variable frequency drive.