CN220771975U

CN220771975U - Internal thread tube bundle of evaporator of coke dry quenching waste heat boiler

Info

Publication number: CN220771975U
Application number: CN202322402303.3U
Authority: CN
Inventors: 汤习中; 杜兵; 罗辉; 肖正文; 杨松; 罗元碧; 成波罗; 赵杰
Original assignee: Sichuan Chuanguo Boiler Co Ltd
Current assignee: Sichuan Chuanguo Boiler Co Ltd
Priority date: 2023-09-05
Filing date: 2023-09-05
Publication date: 2024-04-12
Anticipated expiration: 2033-09-05

Abstract

The utility model relates to the technical field of waste heat boilers, and provides an internal thread tube bundle of a dry quenching waste heat boiler evaporator, which comprises a coiled tube, wherein an internal thread groove is formed in the inner wall of the coiled tube. According to the internal thread tube bundle of the dry quenching waste heat boiler evaporator, due to the effect of the internal thread grooves, saturated water can spirally rise and rotate when flowing in the coiled tube, saturated water forms saturated steam after heat exchange, water drops in the saturated steam are continuously close to the tube wall under the action of centrifugal force and finally reach the tube wall to supplement a water film, so that the coiled tube is protected, and the probability of membranous boiling is reduced.

Description

Internal thread tube bundle of evaporator of coke dry quenching waste heat boiler

Technical Field

The utility model relates to the technical field of waste heat boilers, in particular to an internal thread tube bundle of an evaporator of a dry quenching waste heat boiler.

Background

At present, the domestic dry quenching waste heat boiler has lower parameters, and the first-stage evaporators adopt light pipe evaporators. With the application of high-parameter dry quenching waste heat boilers (super-high pressure and above subcritical pressure and steam pressure of above 13.7 MPa), the traditional light pipe type evaporator is easy to generate film boiling phenomenon, the safe and stable operation of the system cannot be ensured, and further the hydrodynamic force of the dry quenching waste heat boiler evaporator is deteriorated.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide an internal thread tube bundle of an evaporator of a dry quenching waste heat boiler, which can reduce the probability of occurrence of a film boiling phenomenon.

In order to achieve the above object, the present utility model is realized by the following technical scheme: the internal thread tube bundle of the dry quenching waste heat boiler evaporator comprises a coiled tube, wherein an internal thread groove is formed in the inner wall of the coiled tube.

Further, the internal thread groove is formed by cutting the inner wall of the coiled pipe outwards, the internal thread groove comprises a groove bottom and two groove surfaces, the two groove surfaces are respectively positioned at two sides of the groove bottom, a first side of the groove surface is connected with the groove bottom, and a second side of the groove surface is inclined outwards.

Further, the included angle between the groove bottom and the groove surface is 150 degrees.

Further, the material of the coiled pipe is 20G, SA-210C or 15CrMo.

Further, the internally threaded groove extends continuously from the first end of the serpentine tube to the second end of the serpentine tube.

The utility model has the beneficial effects that: according to the internal thread tube bundle of the dry quenching waste heat boiler evaporator, due to the effect of the internal thread grooves, saturated water can spirally rise and rotate when flowing in the coiled tube, saturated water forms saturated steam after heat exchange, water drops in the saturated steam are continuously close to the tube wall under the action of centrifugal force and finally reach the tube wall to supplement a water film, so that the coiled tube is protected, and the probability of membranous boiling is reduced.

Drawings

FIG. 1 is a schematic view of a serpentine tube;

fig. 2 is a schematic view of a partial cross-sectional structure of a serpentine tube.

Reference numerals: 10-coiled pipe, 20-internal thread groove, 21-groove bottom and 22-groove surface.

Detailed Description

The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.

In the present application, unless explicitly specified and limited otherwise, the terms "coupled," "affixed" and "fixedly attached" are to be construed broadly, and may be, for example, fixedly attached, detachably attached, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present application, it should be understood that the terms "longitudinal," "transverse," "horizontal," "top," "bottom," "upper," "lower," "inner" and "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is two or more unless specifically defined otherwise.

As shown in fig. 1-2, the utility model provides an internal thread tube bundle of a dry quenching waste heat boiler evaporator, which comprises a coiled tube 10, wherein an internal thread groove 20 is formed on the inner wall of the coiled tube 10.

The utility model is used on an evaporator of a high-parameter dry quenching waste heat boiler (super high pressure and above subcritical and steam pressure is above 13.7 MPa). The external medium of the coiled pipe 10 is high-temperature flue gas, and the internal medium is saturated water.

Due to the effect of the internal thread groove 20, saturated water can spiral and rotate when flowing in the coiled pipe 10, saturated water forms saturated steam after heat exchange, water drops in the saturated steam are continuously close to the pipe wall under the action of centrifugal force and finally reach the pipe wall to supplement a water film, so that the coiled pipe 10 is protected, the probability of occurrence of a membranous boiling phenomenon is reduced, and the service life of the evaporator running under a low load condition is prolonged.

In one embodiment, the internal thread groove 20 is formed by cutting the inner wall of the serpentine tube 10 outward, the internal thread groove 20 includes a groove bottom 21 and two groove surfaces 22, the two groove surfaces 22 are respectively located at both sides of the groove bottom 21, a first side of the groove surface 22 is connected with the groove bottom 21, and a second side of the groove surface 22 is inclined outward.

The female screw groove 20 is a rectangular groove structure in a sectional view.

By the design, on one hand, the water film in the internal thread groove 20 is not easily taken away by saturated steam due to the three-way adhesion effect, so that the water film can be continuously maintained and is not immediately evaporated, and the protection effect on the coiled pipe 10 is further improved; on the other hand, the internal thread groove 20 also increases the turbulence of saturated steam in the serpentine pipe 10, improves the convection heat transfer coefficient and improves the heat transfer effect.

In one embodiment, the angle between the groove bottom 21 and the groove face 22 is 150 °.

In one embodiment, the serpentine tube 10 is 20G, SA-210C or 15CrMo.

In one embodiment, the internally threaded groove 20 extends continuously from a first end of the serpentine tube 10 to a second end of the serpentine tube 10. The continuous internal thread groove 20 can further reduce the probability of occurrence of the film boiling phenomenon.

While the fundamental principles, principal features, and advantages of the present utility model have been shown and described, it will be apparent to those skilled in the art that the present utility model is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. The utility model provides a dry quenching exhaust-heat boiler evaporator internal thread tube bank, includes coiled pipe, its characterized in that: the inner wall of the coiled pipe is provided with an internal thread groove;

the internal thread groove is formed by outwards cutting off the inner wall of the coiled pipe, the internal thread groove comprises a groove bottom and two groove surfaces, the two groove surfaces are respectively positioned at two sides of the groove bottom, a first side of the groove surface is connected with the groove bottom, and a second side of the groove surface is inclined outwards.

2. The internally threaded tube bundle of a dry quenching waste heat boiler evaporator as claimed in claim 1, wherein: the included angle between the groove bottom and the groove surface is 150 degrees.

3. The internally threaded tube bundle of a dry quenching waste heat boiler evaporator as claimed in claim 1, wherein: the material of the coiled pipe is 20G, SA-210C or 15CrMo.

4. The internally threaded tube bundle of a dry quenching waste heat boiler evaporator as claimed in claim 1, wherein: the internally threaded groove extends continuously from the first end of the serpentine tube to the second end of the serpentine tube.