CN105066437B - The complete wet back of the body central flame flame boiler of integral type - Google Patents

Abstract

The invention discloses a kind of complete wet back of the body central flame flame boiler of integral type, critical piece has burner, housing, flue, turns smoke-box, box-type heat exchanger, energy-saving appliance and homogenizing plate, it is characterised in that：Boiler shell is cuboid, and flue and box-type heat exchanger are located at housing upper and bottom respectively；Energy-saving appliance application spiral fin coil, housing afterbody is welded in using integrated design；Flue, turn smoke-box and box-type heat exchanger and be immersed in stove water, form complete wet back structure；Strile-back type centered on combustion system.Fuel oil or combustion gas central flame flame and carry out radiation heat transfer in flue, are discharged successively after turning smoke-box, box-type heat exchanger and energy-saving appliance and fully exchanging heat from smoke exhaust pipe from the high-temperature flue gas of flue discharge；Boiler blow-down water is entered in energy-saving appliance pipe by homogenizing plate, then is heated by box-type heat exchanger and flue, is finally discharged from upper boiler outlet pipe.The boiler structure simple and compact, heat-transfer surface connection and reasonable arrangement, the thermal efficiency are higher.

Description

Integrated all-wet back center backfired boiler

technical field

The invention relates to the technical field of fuel-fired gas hot water boilers, in particular to an integrated all-wet back center back-firing boiler.

Background technique

my country is the country with the most boiler production and use in the world today. Industrial boilers are used in all industries of production and life. How to further improve the efficiency of industrial boilers on the existing basis and achieve the purpose of energy conservation and environmental protection is a problem worthy of serious consideration. In order to recover the waste heat of the flue gas and improve the efficiency of the boiler, the existing industrial boilers usually use one or two tube-fin heat exchangers outside the boiler, which makes the entire boiler system not compact enough; and the existing boiler smoke chamber is generally dry Back structure, when the boiler is running, the temperature of the boiler tube plate or panel is high, not only the heat loss is large, but also the heat resistance, sealing performance and processing technology of the tube plate or panel are high. At present, most of the industrial boilers adopt the structure of lower furnace and smoke tube, that is, the furnace is set at the lower part of the shell, and the flue gas washes the heat exchange surface of the smoke tube longitudinally in the tube, and the heat transfer coefficient is low.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides an integrated all-wet back center recovery boiler. The present invention adopts following technical scheme:

One-piece full-humid back central combustion boiler, the main components are burner, shell, furnace, smoke chamber, box-type heat exchanger, economizer and flow sharing plate, it is characterized in that: the boiler shell is a cuboid, the furnace The gallbladder and the box-type heat exchanger are respectively located at the upper and lower parts of the shell; the economizer uses spiral finned tubes and is welded to the tail of the shell with an integrated design; the furnace gall, the smoke chamber and the box-type heat exchanger are all immersed in the furnace water , forming a full wet back structure; the combustion method in the furnace is the central back-burning type.

The spiral-finned tubes of the economizer share a lower tube plate with the box-type heat exchanger, and the spiral-finned tubes are distributed in an equilateral triangle on the tube plate, and the spiral-finned tubes are facing the pipe section at the flue gas outlet of the box-type heat exchanger The light pipe is used, and the other parts adopt spiral finned tubes with large spacing.

A flow equalizer is installed at the inlet of the return pipe of the economizer, and the water outlet at the lower end communicates with the water side inside the housing. The equalizer plate is an orifice plate with through holes, and the through holes are arranged corresponding to the heat exchange tubes of the economizer.

The box-type heat exchanger is formed by vertically butting and welding four flat plates, and the two ends are used as flue gas inlet and outlet; The heat exchange tubes are arranged in a staggered arrangement according to equilateral triangles on the tube plate, and are fixed vertically on the tube plate by welding. The heat exchange tubes can be smooth heat exchange tubes or outer finned heat exchange tubes.

Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The economizer adopts an integrated design to make the overall structure of the boiler more compact and the total thermal efficiency is higher. At the same time, the spiral finned tube is used to increase the heat exchange area and strengthen the efficiency of the boiler. Reduce the disturbance of flue gas and improve the heat exchange efficiency; 2. Adopt the full wet back structure, avoid the damage of high temperature flue gas to the weld seam, improve the service life of the boiler, and at the same time help to reduce the shell surface temperature and reduce heat loss; 3. The boiler adopts the central back-firing type, which increases the radiation heat transfer, improves the heat transfer efficiency of the boiler, simplifies the subsequent convective heat transfer surface, and reduces the manufacturing cost of the boiler; Heat pipe bundles improve heat exchange efficiency and prevent local overheating of the economizer due to uneven distribution of return water. 5. The heat exchange tubes in the box-type heat exchanger are vertically staggered, and the flue gas washes the heat exchange tubes horizontally to effectively improve the convective heat transfer coefficient between the flue gas and the heat exchange tubes. In the lower arrangement, the overall heat exchange process of flue gas and boiler water constitutes a countercurrent flow, achieving the effect of the largest total temperature difference in heat exchange and improving heat exchange efficiency.

Description of drawings

Figure 1 is a schematic diagram of the structure of an integrated all-wet back center backfiring boiler;

Figure 2 is a schematic diagram of the A-A cross-section of the integrated full-humid back central combustion boiler;

Figure 3 is a schematic diagram of the spiral finned tube of the economizer.

Reference signs: 1-burner; 2-housing; 3-smoke chamber; 4-outlet pipe; 5-furnace; 6-atmosphere connecting pipe; 7-safety valve; Water pipe; 10-exhaust pipe; 11-energy saver; 12-condensing pipe; 13-box heat exchanger; 14-drainage pipe.

Detailed ways

Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

The integrated all-wet back center backfiring boiler mainly includes burner 1; shell 2; smoke transfer chamber 3; outlet pipe 4; Smoke exhaust pipe 10; economizer 11; condensation pipe 12; box heat exchanger 13; sewage pipe 14.

The boiler shell 2 is a cuboid, and the upper and lower parts are respectively provided with a furnace 5 and a box-type heat exchanger 13 . Furnace gall 5 adopts waveform, and the end is welded oval head.

The box-type heat exchanger 13 and the economizer 11 are integrally processed, and finally integrally welded to the boiler shell. The box-type heat exchanger 13 is formed by vertically butting and welding four flat plates. The two ends are used as flue gas inlets and outlets. The heat exchange tubes are arranged in a staggered arrangement in equilateral triangles on the tube plate, and are vertically fixed on the tube plate by welding. The heat exchange tubes are smooth heat exchange tubes.

Furnace gall 5, smoke transfer chamber 3 and box-type heat exchanger 13 are all submerged in furnace water to form a fully wet back structure; the combustion method in furnace gall 5 is the central back-burning type.

The economizer 11 uses spiral finned tubes, the upper water inlet is equipped with a flow equalizer 8, and the lower water outlet communicates with the inner water side of the shell 2, and is welded to the tail of the shell with an integrated design. The equalizer plate 8 is an orifice plate with through holes, which is obtained by drilling a whole formed steel plate, and the drilling positions correspond to the heat exchange tubes of the economizer 11 . The spiral finned tubes of the economizer 11 and the box heat exchanger 13 share a lower tube plate, which is arranged in an equilateral triangle. Large spiral fins.

Fuel or gas burns back in the center of the furnace 5 and undergoes radiation heat exchange. The high-temperature flue gas discharged from the furnace passes through the smoke transfer chamber 3, the box heat exchanger 13 and the economizer 11 in sequence, and then flows from the exhaust pipe 10 discharge; the boiler return water enters the economizer 11 tube through the equalizer plate 8, is heated by the box heat exchanger 13 and the furnace 5, and finally is discharged from the upper outlet pipe 4 of the boiler.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (3)

1. One-piece full-humid back central combustion boiler, the main components are burner, shell, furnace liner, box-type heat exchanger in the smoke chamber, economizer and flow sharing plate, its characteristic is that the boiler shell is a cuboid, The furnace and box-type heat exchanger are respectively located at the upper and lower parts of the shell; the box-type heat exchanger is formed by vertically butting and welding four flat plates, and the two ends are used as flue gas inlets and outlets, and its horizontal width is basically the same as the diameter of the furnace. Equivalent, multiple heat exchange tubes are vertically arranged inside, and the upper and lower panels are used as tube sheets. The outer finned heat exchange tube can also be used; the economizer adopts an integrated design and is welded to the tail of the shell, and the economizer adopts a spiral finned tube, and the spiral finned tube and the box heat exchanger share a lower tube plate. The tube plate is distributed in an equilateral triangle, and the tube section facing the flue gas outlet of the box-type heat exchanger adopts a smooth tube, and the rest uses spiral finned tubes with large spacing; the furnace, the smoke chamber and the box-type heat exchanger They are all submerged in the furnace water to form a fully wet back structure, and the combustion method in the furnace is the central back-burning type. 2. The integrated full-humid back central combustion boiler according to claim 1, characterized in that: the inlet of the return pipe at the upper end of the economizer is equipped with a flow equalizer, and the water outlet at the lower end communicates with the inner water side of the shell. 3. The integrated full-humid back central combustion boiler according to claim 1, characterized in that: said flow equalizer is an orifice plate with through holes, and the through holes are arranged corresponding to the heat exchange tubes of the economizer.