CN214948934U

CN214948934U - Evaporator for boiler

Info

Publication number: CN214948934U
Application number: CN202120616077.7U
Authority: CN
Inventors: 洪代清
Original assignee: Xuancheng Dongsheng Machinery Co ltd
Current assignee: Xuancheng Dongsheng Machinery Co ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2021-11-30
Anticipated expiration: 2031-03-26

Abstract

The utility model discloses an evaporator for a boiler, which comprises an upper header and a lower header which are arranged in a boiler flue and are connected with a steam drum through a pipe inlet bundle and a pipe outlet bundle to form a loop, wherein a plurality of evaporating pipes are welded between the upper header and the lower header; viewed from the radial direction of the upper header, the evaporating pipes comprise a central pipe and a plurality of groups of side pipes which are symmetrically arranged by taking the central pipe as a central line, and the central pipe and the side pipes are staggered and arranged equidistantly; the evaporation tube comprises a core tube and a sleeve sleeved outside the core tube or a high-temperature-resistant heat-conducting coating coated on the outer surface of the core tube. The boiler evaporator of the utility model adopts the evaporation pipe system with radial symmetry, multiple rows and axial dislocation distribution, the heat exchange area with the flue gas is large, and the heat exchange efficiency is high; the evaporation tube is coated with the high-temperature-resistant heat-conducting coating, so that the evaporation tube has good wear resistance, corrosion resistance, mechanical impact resistance and thermal shock resistance, the service life of the tube system is prolonged, and meanwhile, the heat exchange efficiency can be improved.

Description

Evaporator for boiler

Technical Field

The utility model relates to an evaporimeter for boiler belongs to the boiler field.

Background

In a boiler, an evaporator is generally installed in a tail flue, the evaporator is communicated with a steam drum, and the evaporator absorbs heat of flue gas to prepare steam. Most boilers equipped with evaporators are large boilers, such as power station boilers, the flue gas volume is large, the impact on evaporator tube bundles is large, and the scouring abrasion is obvious; and the flue gas of the boiler often contains some corrosive gases and corrosive substances in the high-temperature combustion process, particularly a waste incineration boiler, and the substances can generate strong corrosion on an evaporator tube bundle, and leakage hidden troubles exist due to excessive scouring wear and corrosion. Meanwhile, the evaporator tube bundle is easy to deposit dust and scale in the flue, and the heat exchange efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

To the above, the utility model provides an evaporimeter for boiler, the utility model discloses a technical scheme as follows:

an evaporator for a boiler comprises an upper header and a lower header which are arranged in a boiler flue and connected with a steam drum through a pipe inlet bundle and a pipe outlet bundle to form a loop, wherein a plurality of evaporation pipes are welded between the upper header and the lower header, and the ends of the evaporation pipes are respectively welded and fixed with pipe heads on the upper header and the lower header; viewed from the radial direction of the upper header, the evaporating pipes comprise a central pipe and a plurality of groups of side pipes which are symmetrically arranged by taking the central pipe as a central line, and the central pipe and the side pipes are staggered and arranged equidistantly; the evaporation tube comprises a core tube and a sleeve sleeved outside the core tube or a high-temperature-resistant heat-conducting coating coated on the outer surface of the core tube.

Furthermore, the side pipe is a bent pipe formed by bending.

Further, the core tube is made of pearlite structure heat-resistant steel.

Further, the surface of the sleeve is provided with fins, and the surface of the sleeve is coated with a high-temperature-resistant heat-conducting coating.

Compared with the prior art, the beneficial effects of the utility model reside in that: the boiler evaporator of the utility model adopts the evaporation pipe system with radial symmetry, multiple rows and axial dislocation distribution, the heat exchange area with the flue gas is large, and the heat exchange efficiency is high; the evaporation tube is coated with the high-temperature-resistant heat-conducting coating, so that the evaporation tube has good wear resistance, corrosion resistance, mechanical impact resistance and thermal shock resistance, the service life of the tube system is prolonged, and meanwhile, the heat exchange efficiency can be improved; when the utility model discloses an evaporating pipe adopts core pipe box to establish fin sleeve structure, the impact of flue gas can make the fin sleeve pipe take place to rotate to reduce and erode wearing and tearing and reduce the deposition scale deposit.

Drawings

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

fig. 2 is a radial front view of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Example (b):

referring to fig. 1-2, an evaporator for a boiler includes an upper header 3 and a lower header 4 installed in a flue of the boiler and connected to a steam drum through an inlet pipe bundle 1 and an outlet pipe bundle 2 to form a loop, a plurality of evaporation tubes 5 welded between the upper header 3 and the lower header 4, and ends of the evaporation tubes 5 welded to tube heads (not shown) of the upper header and the lower header, respectively; viewed from the radial direction of the upper header 3, the evaporation tubes 5 comprise a central tube 51 and a plurality of groups of side tubes 52 which are symmetrically arranged at an angle with the central tube 51 as a central line, and viewed from the axial direction of the upper header 3, the central tube 51 and the side tubes 52 are staggered and arranged at equal intervals; the evaporation tube 5 includes a core tube and a high temperature resistant heat conductive coating (not shown) coated on an outer surface of the core tube.

Further, the side pipe 52 is a bent pipe formed by bending.

Further, the core tube is made of pearlite structure heat-resistant steel.

The high-temperature-resistant heat-conducting coating can be sprayed by using a high-temperature-resistant heat-conducting energy-saving coating RLHY-2339 of Beijing RongLiheng science and technology Limited, the spraying thickness is 0.3-0.5mm, the coating comprises refractory powder, zirconia, silicate refractory materials and the like, a protective layer with a compact structure can be formed on a pipe system, and the coating has good wear resistance, corrosion resistance and heat conducting performance.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims

1. An evaporator for a boiler, characterized in that: the boiler comprises an upper header and a lower header which are arranged in a boiler flue and connected with a steam drum through a pipe inlet bundle and a pipe outlet bundle to form a loop, wherein a plurality of evaporation pipes are welded between the upper header and the lower header, and the ends of the evaporation pipes are respectively welded and fixed with pipe heads on the upper header and the lower header; viewed from the radial direction of the upper header, the evaporating pipes comprise a central pipe and a plurality of groups of side pipes which are symmetrically arranged by taking the central pipe as a central line, and the central pipe and the side pipes are staggered and arranged equidistantly; the evaporation tube comprises a core tube and a sleeve sleeved outside the core tube or a high-temperature-resistant heat-conducting coating coated on the outer surface of the core tube.

2. The evaporator for a boiler as set forth in claim 1, wherein: the side pipe is a bent pipe formed by bending.

3. The evaporator for a boiler as set forth in claim 1, wherein: the core pipe is made of heat-resistant steel with a pearlite structure.

4. The evaporator for a boiler as set forth in claim 1, wherein: the surface of the sleeve is provided with fins, and the surface of the sleeve is coated with a high-temperature-resistant heat-conducting coating.