CN213578800U

CN213578800U - Kiln head waste heat boiler integrated with clinker cooler

Info

Publication number: CN213578800U
Application number: CN202022766649.8U
Authority: CN
Inventors: 曹勇; 袁克; 陈俊; 张迎春; 宣炎明; 苏德林; 孙海龙; 陆子龙
Original assignee: Nantong Wanda Boiler Co Ltd
Current assignee: Nantong Wanda Energy Power Technology Co ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-06-29
Anticipated expiration: 2030-11-25

Abstract

The utility model discloses a kiln head exhaust-heat boiler with grog cooler integration, kiln head exhaust-heat boiler directly arranges on grog cooler civil engineering factory building upper portion, the boiler bottom is directly continuous with the grog cooler through square reducing large cross section flue, has cancelled glassware and the ash conveying system of zip fastener machine under the conventional boiler. The kiln head waste heat boiler does not have an external settling chamber or an internal settling chamber, greatly simplifies a flue gas pipeline, reduces system waste gas resistance and heat loss, improves the recovery rate of a waste heat system, optimizes the occupied area, reduces the cost of civil engineering foundation and the flue gas pipeline, and saves the investment cost. The method is particularly suitable for cement kiln production lines and waste heat power generation projects which are built synchronously, has strong practicability and popularization, and has good application prospect in the future.

Description

Kiln head waste heat boiler integrated with clinker cooler

Technical Field

The utility model relates to a kiln hood exhaust-heat boiler especially relates to a kiln hood exhaust-heat boiler with grog cooler integration, belongs to the waste heat and waste gas recovery field.

Background

The waste heat recovery system of the kiln head of the cement kiln is generally divided into two types. The early technology is that low temperature flue gas with dust, which is led out from a clinker cooler, is dedusted by an external settling chamber and then enters a boiler heating surface from top to bottom for heat exchange and recovery. There are three disadvantages to this waste heat recovery system:

1. the external settling chamber occupies a large area, is relatively independently arranged from the boiler, is far away from the boiler, and has high civil engineering investment cost.

2. The internal resistance of the external settling chamber and the total resistance of the flue gas air pipe along the way are additionally increased by about 150-200 Pa, so that the power consumption of a draught fan at the tail part of the system is increased.

3. Due to the heat dissipation loss of the external settling chamber and the large and complex smoke and air pipelines, the temperature of smoke entering the boiler is lost by about 10 ℃, high-quality smoke cannot enter the boiler for heat exchange, energy is wasted, and the utilization efficiency of a waste heat recovery system is low.

In recent years, along with the technical upgrade, more and more projects adopt the technology of a boiler with a built-in settling chamber, low-temperature flue gas with dust, which is led out from a clinker cooler, directly enters the large built-in settling chamber at the bottom of the boiler, and after the dust is removed by the built-in settling chamber, the flue gas enters a heating surface of the boiler from bottom to top for heat exchange recovery. The waste heat recovery system can basically solve the defects of the three aspects, but from the view of actual project construction and operation conditions, the waste heat recovery system still has some defects:

1. the built-in settling chamber still needs at least two steel structures or concrete columns for supporting, and the occupied area is not optimized;

2. the total resistance of the internal resistance of the built-in settling chamber and the on-way resistance of the flue gas air pipe is about 50-100 Pa, and the extra power consumption of the induced draft fan still needs to be increased;

3. the heat dissipation loss of the huge built-in settling chamber and the flue gas pipeline still causes the temperature loss of the boiler to be about 5 ℃, and the heat of the flue gas still has certain loss.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that eliminate sedimentation chamber area among the cement kiln hood waste heat recovery system, eliminate the sedimentation chamber internal resistance and reduce flue tuber pipe on-way resistance, eliminate sedimentation chamber heat dissipation and reduce cigarette wind pipeline heat dissipation.

In order to solve the technical problem, the kiln head waste heat boiler integrated with the clinker cooler comprises a flue which is vertically arranged, wherein a clinker cooler interface expansion joint, a flue gas inlet flue, a heating surface flue and an outlet flue are sequentially arranged on the vertically arranged flue from bottom to top, the clinker cooler interface expansion joint is connected with a clinker cooler air intake, the other end of the clinker cooler interface expansion joint is connected with a square reducing large-section-area flue, the other end of the square reducing large-section-area flue is connected with the flue gas inlet expansion joint, the other end of the flue gas inlet expansion joint is connected with the flue gas inlet flue, the other end of the flue gas inlet flue is connected with the heating surface flue, and the other end of the heating surface flue is connected with the outlet flue.

In the technical scheme, a flow equalizing device is arranged in the flue gas inlet flue.

In the technical scheme, the flue gas inlet flue is of an inner casting structure, and the inner casting structure is formed by casting a tortoise shell net and wear-resistant plastic materials.

In the technical scheme, the kiln head waste heat boiler is arranged at the upper part of a clinker cooler factory building.

In the technical scheme, the flow equalizing device is formed by vertically arranging the semicircular pipes and the angle steels in a staggered manner.

In the technical scheme, the semicircular pipe is arranged in two layers, the angle steel is arranged in one layer, and the semicircular pipe and the opening of the angle steel are oppositely arranged.

In the technical scheme, the vertical distance between the semicircular pipes is 150-200 mm, the vertical distance between the semicircular pipes and the angle steel is 150-200 mm, and the horizontal distance between the angle steel is 150-300 mm.

The kiln head waste heat boiler integrated with the clinker cooler has the following advantages:

1. the kiln head waste heat boiler is arranged at the upper part of a clinker cooler civil engineering plant and is integrally arranged with the clinker cooler, so that the civil engineering foundation and the occupied area are reduced, and the civil engineering investment cost is saved.

2. The bottom inlet of the boiler is directly connected with the air intake of the clinker cooler through the square reducing large-section flue, so that the smoke and air pipeline is greatly simplified. On one hand, the cost of a smoke and air pipeline is saved, on the other hand, the smoke resistance and the heat dissipation loss of the system are almost zero, the energy consumption of a draught fan is not additionally increased, the temperature of the boiler is increased by 5-10 ℃ compared with that of a conventional system, and the recovery efficiency of a waste heat system is increased by 1.5-3%.

3. The low-speed dust collection of the square reducing large-section flue enables ash content to settle into the clinker cooler, so that zero ash content enters the boiler basically, the heat transfer efficiency of the boiler is improved, meanwhile, the abrasion of heat exchange surface pipes is effectively reduced, and the service life of equipment is prolonged.

4. The conventional boiler feeder and the zipper machine ash conveying system are omitted from the bottom of the boiler, the system is simple and convenient to operate, and meanwhile, the equipment investment cost is reduced.

5. Expansion joints are arranged among the clinker cooler connector, the square reducing large-section flue and the flue gas inlet flue, so that expansion among components is effectively absorbed, and the safety of equipment is improved.

Drawings

Fig. 1 is a front view structural diagram of a kiln head waste heat boiler integrated with a clinker cooler.

FIG. 2 is a C diagram of FIG. 1.

FIG. 3 is an enlarged view of the structure of the square reducing large-section flue in the connection state.

FIG. 4 is a schematic cross-sectional view of a flow straightener.

Detailed Description

Referring to fig. 1 to 4, in an embodiment of the kiln head waste heat boiler integrated with a clinker cooler, a clinker cooler interface expansion joint 1, a square flue with a different diameter and a large cross section 2, a flue gas inlet expansion joint 3, a flue gas inlet flue 4, a heating surface flue 5 and an outlet flue 6 are respectively welded and connected in sequence from bottom to top to construct a flue which is vertically arranged. The square reducing large-section flue 2 is directly connected with a clinker cooler 8 through a clinker cooler interface expansion joint 1. A flow equalizing device 7 is arranged in the flue gas inlet 4. The whole kiln head waste heat boiler is arranged at the upper part of a clinker cooler factory building.

The flow speed of flue gas in the square reducing large-section flue 2 is controlled to be below 5 m/s.

And the flow velocity of the flue gas in the flue gas inlet 4 is controlled to be 3-4 m/s.

The bottom of the kiln head waste heat boiler is free of a conventional boiler feeder and a zipper machine ash conveying system, so that the equipment investment cost is reduced.

Referring to fig. 4, the flow equalizing device 7 is composed of semicircular pipes 13 and angle steels 14 which are arranged in a staggered manner from top to bottom, the semicircular pipes 13 are arranged in two layers, the angle steels 14 are arranged in one layer, and the upper semicircular pipe 13 and the lower semicircular pipe 13 are correspondingly arranged. The vertical distance between the semicircular pipes 13 and the angle steel 14 are respectively 150-200 mm, and the horizontal distance between the angle steels 14 is respectively 150-300 mm. The flow equalizing device 7 organizes a proper exhaust gas flow field, so that the flue gas after dust removal does not flow in a bias way, does not form a vortex, flows to the heating surface flue 5 uniformly and stably, enhances heat exchange, and prolongs the service life of the heat exchange surface.

Referring to fig. 2, the flue gas inlet 4 adopts an inner casting structure 12, and the inner casting structure 12 is formed by casting a tortoise shell net and wear-resistant plastic.

The kiln head waste heat boiler can adopt a single-pressure system, a flash evaporation system and a double-pressure system according to the needs of the system.

The kiln head waste heat boiler flue gas flow in the scheme is as follows: high-temperature flue gas led out from an air intake of a clinker cooler → a clinker cooler interface expansion joint 1 → a square reducing large-section flue 2 → a flue gas inlet expansion joint 3 → a flue gas inlet flue 4 → a heating surface flue 5 → an outlet flue 6.

High-temperature flue gas containing dust from a clinker cooler is in the square reducing large-section flue 2, the flow velocity of the flue gas suddenly drops due to the sudden increase of the flow section, dust particles losing kinetic energy slowly settle under the action of gravity, low-speed dust recovery is realized, and the dust particles fall back into the clinker cooler 8.

The kiln head waste heat boiler does not have an external settling chamber or an internal settling chamber, greatly simplifies a flue gas pipeline, reduces system waste gas resistance and heat loss, improves the recovery rate of a waste heat system, optimizes the occupied area, reduces the cost of civil engineering foundation and the flue gas pipeline, and saves the investment cost.

Claims

1. The utility model provides a kiln head exhaust-heat boiler with clinker cooler integration, is including being the flue of vertical arrangement, clinker cooler interface expansion joint, flue gas inlet flue, heating surface flue, export flue have been arranged from below in proper order to the flue of vertical arrangement, clinker cooler interface expansion joint connects the clinker cooler and gets the wind gap, its characterized in that: the clinker cooler interface expansion joint is characterized in that the other end of the clinker cooler interface expansion joint is connected with a square reducing large-section flue, the other end of the square reducing large-section flue is connected with a flue gas inlet expansion joint, the other end of the flue gas inlet expansion joint is connected with a flue gas inlet flue, the other end of the flue gas inlet flue is connected with a heating surface flue, and the other end of the heating surface flue is connected with an outlet flue.

2. A kiln head waste heat boiler integrated with a clinker cooler as claimed in claim 1, characterized in that: and a flow equalizing device is arranged in the flue gas inlet.

3. A kiln head waste heat boiler integrated with a clinker cooler as claimed in claim 1, characterized in that: the flue gas inlet flue is of an inner casting structure, and the inner casting structure is formed by casting a tortoise shell net and wear-resistant plastic materials.

4. A kiln head waste heat boiler integrated with a clinker cooler as claimed in claim 1, characterized in that: the kiln head waste heat boiler is arranged at the upper part of a clinker cooling machine factory building.

5. A kiln head waste heat boiler integrated with a clinker cooler as claimed in claim 2, characterized in that: the flow equalizing device is composed of semicircular pipes and angle steels which are arranged in a staggered mode from top to bottom.

6. A kiln head waste heat boiler integrated with a clinker cooler as claimed in claim 5, characterized in that: the semicircular pipe is arranged in two layers, the angle steel is arranged in one layer, and the semicircular pipe and the opening of the angle steel are oppositely arranged.

7. A kiln head waste heat boiler integrated with a clinker cooler as claimed in claim 5, characterized in that: the vertical distance between the semicircular pipe and the angle steel is 150-200 mm, and the horizontal distance between the angle steel is 150-300 mm.

8. A kiln head waste heat boiler integrated with a clinker cooler as claimed in claim 6, characterized in that: the vertical distance between the semicircular pipes is 150-200 mm, the vertical distance between the semicircular pipes and the angle steel is 150-200 mm, and the horizontal distance between the angle steel is 150-300 m.