CN201401771Y

CN201401771Y - Waste heat conversion boiler

Info

Publication number: CN201401771Y
Application number: CN2009200643710U
Authority: CN
Inventors: 刘克军; 邹强; 杨阿鹏
Original assignee: China Petrochemical Corp
Current assignee: China Petrochemical Corp
Priority date: 2009-05-09
Filing date: 2009-05-09
Publication date: 2010-02-10
Anticipated expiration: 2019-05-09

Abstract

The utility model discloses a waste heat conversion boiler. The heat exchange pipe (4) in the waste heat conversion boiler adopts a perforated pipe with a machined surface; and grooves on the pipe wall of the perforated pipe comprises longitudinal spiral grooves and radial grooves, thereby ensuring better heat exchange effect. A central by-pass pipe (7) is also arranged in the middle of the cylinder body (1) of the waste heat conversion boiler; and an adjusting valve head, of which the opening degree is adjusted according to heat exchange quantity, is also arranged at the outlet of the centralby-pass pipe (1). The utility model has the advantages of simple structure, high heat exchange efficiency, small size, adjustable heat exchange quantity and long service life.

Description

A kind of conversion waste heat boiler

Technical field

The utility model relates to a kind of efficient hydrogen manufacturing and transforms waste heat boiler, and especially pressurized catalysis Hydrogen manufacture by partial oxidation device transforms the waste heat boiler of gas making flow process, belongs to the augmentation of heat transfer technical field.

Background technology

In petroleum refining, petrochemical industry were produced, waste heat boiler was not only the visual plant that reclaims a large amount of waste heats that exist in the production, the indispensable equipment of processing normal operation that still guarantees that has.Therefore, energy-conservation and optimization heat-exchange system is the developing important topic of petrochemical technology.

Transforming waste heat boiler is one of key equipment in the process for making hydrogen.About 820 ℃ reformed gas is through transforming waste heat boiler and deoxygenated water heat exchange, and the reformed gas temperature is reduced to 370 ℃, satisfies the requirement of back operation to the reformed gas temperature.While recovery section heat energy, the by-product low pressure steam has important function to reducing plant energy consumption.

Existing conversion waste heat boiler mostly is with the shell-and-tube heat exchanger of common light pipe as heat exchange element, and heat transfer efficiency is low, satisfy heat exchange amount, is main means to increase the equipment heat exchange area.Development along with petrochemical industry, the demand of hydrogen resource is increasing, device for producing hydrogen ability newly-built or enlarging is increasing, if still adopt intrinsic words, can only enlarge the heat exchanger sectional area, increase heat exchanger tube quantity, enlarge heat exchange area, cause the waste heat boiler volume increasing, the equipment heaviness, the installation in position difficulty, manufacturing expense and mounting cost are more and more higher.Also have some device for producing hydrogen, especially need to expand the old device of energy, the scene has not had unnecessary position, the volume expansion of equipment is restricted, expand energy in order not influence whole device, take past boiler inlet or outlet to add the way of chilled water (chw), reduction exports the reformed gas temperature and makes it to satisfy technological requirement, but the shortcoming of doing like this is both to have wasted a large amount of heat energy, and chilled water (chw) can shorten the service life of equipment and materials and postorder workshop section catalyst simultaneously.

The utility model content

The purpose of this utility model provides that a kind of volume is little, heat exchange efficiency is high, the shell-and-tube of the fixed tube sheet type structure of long service life transforms waste heat boiler.

In order to realize above purpose, the utility model waste heat boiler comprises boiler barrel, reformed gas import, reformed gas outlet, front and back tube sheet, tedge, down-comer, deoxygenated water inlet, steam (vapor) outlet, drum, compositions such as heat exchanger tube.

Heat exchanger tube is that a kind of machine adds dual sunk surface antipriming pipe in the said structure, be to adopt the thick-walled pipe light pipe, at its outer tube wall, a kind of dual depression loose structure that method by machining obtains, concrete structure is to be distributed with porous pit at heat exchange pipe external surface, groove radially is in spiral distribution, and groove vertically is parallel with axis, and the width of slot cross-section shape bottom is greater than the width on groove top.

The utility model also comprises the center shunt valve that is located at the heat exchanger tube middle part, and the circulation area of shunt valve is 50%～60% of the total circulation area of heat exchanger tube.The adjusting valve head is established in its outlet, controls boiler export reformed gas temperature by regulating through the conversion tolerance in the shunt valve.Control valve can be manually control or control automatically.

The heat exchanger tube surface porosity reduces the required degree of superheat of liquid boiling greatly for boiling heat transfer provides a large amount of stable nucleus of boiling; Improved flowing of surface liquid simultaneously, attenuate the laminar flow layer between liquid and the tube wall, reduce heat transfer resistance, enhanced boiling heat transfer.Utilize machine to add the outstanding exchange capability of heat of dual sunk surface porous heat transfer pipe, can be to greatest extent that the reformed gas of higher temperature is contained heat transferred deoxygenated water of unit interval, the unit heat exchange area can produce more steam than normal optical heat exchange of heat pipe, the heat exchange efficiency height, therefore, need not add the requirement that chilled water (chw) just can satisfy exit reformed gas temperature at reformed gas inlet or exit, promptly save a large amount of heat energy, eliminated the problem in the service life that adds chilled water (chw) shortening equipment and materials and postorder workshop section catalyst simultaneously.Equally, because coefficient of heat transfer height, the required heat exchange area of the utility model is little, and facility compact reduces equipment cost.In addition,, reduced the surface temperature of heat exchanger tube, reduced the thermal stress between heat exchanger tube and the housing, prolonged the service life of tube sheet and heat exchanger tube owing to the outstanding exchange capability of heat of heat exchanger tube, the more timely heat of taking away.The utility model can solve a lot of because amplification of the narrow and small limiting device volume in space and an actual production difficult problem that can't expansion capability.

In sum, of the present utility model have simple in structure, heat exchange efficiency is high, volume is little, the heat exchange amount is adjustable, the advantage of long service life.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is dual sunk surface antipriming pipe structural representation for machine adds.

Fig. 3 is dual sunk surface antipriming pipe cross section structure schematic diagram for machine adds.

The specific embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in detail.

Referring to Fig. 1, heat exchanger tube 4 is distributing in the cylindrical shell 1, the quantity of heat exchanger tube 4 is determined according to the heat exchange amount of equipment needs, the relative position of heat exchanger tube 4 is fixed by tube sheet 5 and 6, deoxygenated water enters in the drum 13 from deoxygenated water inlet 11, enters boiler through down-comer 9, adds dual sunk surface porous heat transfer pipe 4 and reformed gas heat exchange by machine, generation vapour, aqueous mixtures return drum 13 through tedge 10, and the saturated vapor after the separation is sent outside for using from steam (vapor) outlet 12.And enter the reformed gas and deoxygenated water heat exchange of boiler from reformed gas import 2 after, and mix through the reformed gas of center shunt valve 7 without heat exchange, discharge from reformed gas outlet 3, enter subsequent processing.The exit of center shunt valve 7 also is provided with regulates valve head 8, and the aperture of regulating valve head 8 when regulating the valve head contract fully, promptly reaches the maximum exchange capability of heat of waste heat boiler by the decision of heat exchange amount.

In the said structure, adopt many machines to add porous surface tube as heat exchange element, 170 φ 32 * 3.5 * 3500mm for example, the antipriming pipe profile as shown in Figures 2 and 3, porous layer slot pitch 2mm, the wide 1.5mm of trench bottom, the wide 0.5mm in groove top, the center bypass pipe is of a size of φ 273, and actual heat exchange area is 60M only ², boiler diameter 1.2m if adopt normal optical heat exchange of heat pipe design of the prior art, transforms waste heat boiler and needs heat exchange area 120M ², the about 1.8m of boiler barrel diameter.Therefore, the utility model has been cut down 50% heat exchange area volume and just can have been reached same heat exchange effect.

Claims

1. conversion waste heat boiler, by boiler barrel (1), reformed gas import (2), reformed gas outlet (3), front tube sheet (5), back tube sheet (6), tedge (10), down-comer (9), deoxygenated water inlet (11), steam (vapor) outlet (12), drum (13), heat exchanger tube compositions such as (4) is characterized in that, described heat exchange pipe external surface has porous pit, groove radially is in spiral distribution, and groove vertically is parallel with axis, and the width of slot cross-section shape bottom is greater than the width on groove top, also be provided with center shunt valve (7) at the middle part of boiler barrel (1), the port of export of described center shunt valve (7) is provided with regulates valve head (8).