CN214536856U

CN214536856U - Full-premixing water-cooling combustion vacuum boiler

Info

Publication number: CN214536856U
Application number: CN202120582653.0U
Authority: CN
Inventors: 黄学兵; 曾俊辉
Original assignee: Rosen Boiler Co ltd
Current assignee: Rosen Boiler Co ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2021-10-29
Anticipated expiration: 2031-03-18

Abstract

The utility model discloses a full premix water-cooling combustion vacuum boiler, which comprises a base, a boiler body, a water-cooling combustor and a condenser; the boiler body is arranged on a base, the boiler body comprises an upper collecting box and a lower collecting box which are arranged up and down, a hearth is connected between the upper collecting box and the lower collecting box, a plurality of water pipes communicated with the upper collecting box and the lower collecting box are arranged in the hearth, and a tubular heat exchanger is arranged above the upper collecting box and communicated with the upper collecting box; the water-cooled burner is arranged on the base and positioned at the inlet of the hearth, the water-cooled burner is a full-premix burner and comprises a fire grate, a flame stabilizing pipe and a communicating pipe, and by adopting the full-premix burner, cooling water in the fire grate and the flame stabilizing pipe can quickly take away heat, so that the flame temperature is effectively reduced, and the generation of harmful gas is reduced; meanwhile, the flame is stable in combustion, and the phenomena of backfire, deflagration, blockage, flameout and the like can not occur.

Description

Full-premixing water-cooling combustion vacuum boiler

Technical Field

The utility model relates to a vacuum boiler field technique especially indicates a full premix water-cooling burning vacuum boiler.

Background

The vacuum boiler is a heat exchange device which transfers heat by virtue of boiling evaporation and condensation heat exchange of a heat medium so as to heat feed water. In recent years, the fuel oil and gas vacuum boiler has the advantages of small volume, high automation degree, no corrosion, no scaling and convenient installation, and is widely applied. However, in order to avoid low-temperature corrosion of the heated surface at the tail of the boiler, the exhaust temperature of the traditional vacuum boiler is usually higher than 140 ℃, which not only consumes a large amount of energy, but also increases the operation cost of the boiler, and the flue gas of the gas-fired boiler contains about 15-19% (volume) of water vapor, which is a main carrier of the heat of the flue gas. If the exhaust gas temperature of the boiler is reduced to around 100 c, the vacuum boiler efficiency is improved by about two percentage points.

The nitrogen oxide is generated by the combustion of a gas boiler, the nitrogen oxide harms the atmospheric environment and generates haze, and the new standard requires that the emission of the nitrogen oxide of the boiler does not exceed 30mg/m³. The discharge of nitrogen oxides is mainly determined by the burner matched with the boiler. The low-nitrogen burners which can meet the requirements in the current market are two types, the first type is a flue gas recirculation low-nitrogen burner, the burners are mainly produced by European and American burner manufacturers and are expensive, and the heat efficiency of a boiler is reduced because non-combustible flue gas is increased in the boiler and a larger hearth combustion space is needed; the other is a low-nitrogen burner burning on the surface of a metal net, the metal net of the burner has a plurality of tiny pores, and after the burner is used for a period of time, impurities in the air block the pores and need to be cleaned regularly. Therefore, there is a need for improvements to existing boilers.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to the deficiency of the prior art, and the main objective of the present invention is to provide a fully premixed water-cooled combustion vacuum boiler, which can effectively solve the problems of low thermal efficiency and easy blockage of the prior boiler.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a full-premixing water-cooled combustion vacuum boiler comprises a base, a boiler body, a water-cooled combustor and a condenser; the boiler body is arranged on a base, the boiler body comprises an upper collecting box and a lower collecting box which are arranged up and down, a hearth is connected between the upper collecting box and the lower collecting box, a plurality of water pipes communicated with the upper collecting box and the lower collecting box are arranged in the hearth, and a tubular heat exchanger is arranged above the upper collecting box and communicated with the upper collecting box; this water-cooled combustor sets up on the base and is located furnace's import department, and this water-cooled combustor is full premix combustor, and it is including fire bank, steady flame pipe and communicating pipe, and this fire bank and steady flame pipe are vertical to be set up side by side between last collection box and lower collection box, and this communicating pipe is located the both sides of fire bank and steady flame pipe, the inside cavity of fire bank, steady flame pipe, communicating pipe and with last collection box and lower collection box intercommunication, this condenser sets up on the base and is located furnace's rear, condenser and furnace intercommunication.

Preferably, the upper header and the lower header are arranged in an up-and-down symmetrical manner.

Preferably, the lower end of the shell pass of the tubular heat exchanger is provided with an opening and is welded with the opening at the upper end of the upper header, and the tubular heat exchanger is connected with a water outlet and a water return port which are communicated with the shell pass and an exhaust hole which is communicated with the shell pass.

Preferably, the hearth is a square hearth.

Preferably, the outlet of the hearth is provided with a convection bank which is transversely washed, the front side multiple rows of convection banks are light tubes, and the rear side multiple rows of convection banks are spiral finned tubes.

Preferably, a plurality of rows of spiral finned tubes are arranged in the condenser in a staggered or in-line mode.

Compared with the prior art, the utility model obvious advantage and beneficial effect have, particularly, can know by above-mentioned technical scheme:

by adopting the fully premixed burner, the cooling water in the fire grate and the flame stabilizing pipe can quickly take away heat, so that the flame temperature is effectively reduced, and the generation of harmful gas is reduced; meanwhile, flame combustion is stable, phenomena such as backfire, explosion, blockage and flameout cannot occur, and multiple rows of spiral finned tubes are adopted at the tail part of the convection heating surface of the boiler body, so that the length and the size of the boiler are greatly reduced, the occupied area is reduced, and capital investment is reduced for users while the heat exchange efficiency is improved.

To more clearly illustrate the structural features and functions of the present invention, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments:

drawings

FIG. 1 is a front elevation view in vertical section of a preferred embodiment of the invention;

FIG. 2 is a top view in transverse cross-section of a preferred embodiment of the present invention;

fig. 3 is a side view in longitudinal section of a preferred embodiment of the invention.

The attached drawings indicate the following:

10. base 20, boiler body

21. Upper header 22, lower header

23. Hearth 24 and water pipe

25. Tubular heat exchanger 26, light pipe

27. Spiral finned tube 201 and water outlet

202. Return opening 203, exhaust hole

30. Water-cooled burner 31, fire row

32. Flame stabilizing pipe 33 and communicating pipe

40. Condenser 41 and spiral finned tube

42. Smoke outlet

Detailed Description

Referring to fig. 1 to 3, a detailed structure of a preferred embodiment of the present invention is shown, which includes a base 10, a boiler body 20, a water-cooled burner 30 and a condenser 40.

The boiler body 20 is arranged on the base 10, the boiler body 20 comprises an upper header 21 and a lower header 22 which are arranged up and down, a hearth 23 is connected between the upper header 21 and the lower header 22, a plurality of water pipes 24 for communicating the upper header 21 and the lower header 22 are arranged in the hearth 23, a tubular heat exchanger 25 is arranged above the upper header 21, and the tubular heat exchanger 25 is communicated with the upper header 21; in this embodiment, the upper header 21 and the lower header 22 are symmetrically arranged up and down, the furnace 23 is a square furnace, the outlet of the furnace 23 is provided with a convection bank which is transversely washed, the front side multiple rows of convection banks are light pipes 26, the rear side multiple rows of convection banks are spiral finned tubes 27, since the spiral finned tubes 27 are adopted on the convection heating surface of the rear half part of the boiler body 20, the heating area is increased, it can be ensured that higher heat transfer efficiency is obtained at lower flue gas flow velocity, and since the multiple rows of spiral finned tubes 27 are adopted, the length of the boiler body 20 is greatly shortened, and the floor space of the boiler is reduced; and the lower end of the shell pass of the tubular heat exchanger 25 is an opening and is welded with the opening at the upper end of the upper header 21, and the tubular heat exchanger 25 is connected with a water outlet 201 and a water return port 202 which are communicated with the tube pass and an exhaust hole 203 which is communicated with the shell pass.

The water-cooled burner 30 is arranged on the base 10 and positioned at the inlet of the hearth 23, the water-cooled burner 30 is a fully premixed burner, which comprises a fire row 31, flame holding pipes 32 and a communicating pipe 33, wherein the fire row 31 and the flame holding pipes 32 are vertically arranged between an upper header 21 and a lower header 22 side by side, the communicating pipes 33 are positioned at two sides of the fire grate 31 and the flame stabilizing pipes 32, the fire grate 31, the flame stabilizing pipes 32 and the communicating pipes 33 are hollow and communicated with the upper header 21 and the lower header 22, and a full premix combustion mode is adopted, so that cooling water in the fire grate 31 and the flame stabilizing pipes 32 can quickly take away heat, the flame temperature is effectively reduced, the generation of harmful gas is reduced, meanwhile, the flame combustion is stable, the phenomena of backfire, deflagration, blockage, flameout and the like can not occur, and the discharge amount of nitrogen oxides reaches 30mg/m especially under the condition of low excess air coefficient (for example, the oxygen content in the flue gas is lower than 2.5 percent).³And the emission of NOx is greatly reduced while the combustion efficiency is improved.

The condenser 40 is arranged on the base 10 and positioned at the rear part of the hearth 23, and the condenser 40 is communicated with the hearth 23; the utility model discloses a boiler, including condenser 40, it has multiseriate spiral finned tube 41 in the condenser 40, this multiseriate spiral finned tube 41 is for the staggered arrangement or in the same direction as the row arranges, the flue gas and the feedwater reverse flow of condenser 40 have improved the heat transfer difference in temperature, the entrance connecting system return water of condenser 40, condenser 40 goes out water and connects the tubular heat exchanger 25 import of boiler body 20, owing to adopted the system return water, but not heat medium water is the feedwater of condenser 40, can promote condenser 40's waste heat recovery's efficiency greatly to save a large amount of fuels.

Detailed description the working principle of the present embodiment is as follows:

the mixed air and natural gas are combusted in the hearth 23 through the combustor 30 to heat water in the water pipe 24, the light pipe 26 and the spiral finned tube 27, high-temperature flue gas generated by combustion enters the condenser 40 and is discharged to a chimney through the smoke outlet 42 after heat exchange of the condenser 40 is completed, the high-temperature flue gas is cooled through system water in the spiral finned tube 41 in the condenser 40, waste heat is absorbed, the temperature of the boiler smoke is reduced to be below the zero point of the flue gas, and meanwhile, the heat efficiency is improved by about 10% -12%.

The utility model discloses a design key is: by adopting the fully premixed burner, the cooling water in the fire grate and the flame stabilizing pipe can quickly take away heat, so that the flame temperature is effectively reduced, and the generation of harmful gas is reduced; meanwhile, flame combustion is stable, phenomena such as backfire, explosion, blockage and flameout cannot occur, and multiple rows of spiral finned tubes are adopted at the tail part of the convection heating surface of the boiler body, so that the length and the size of the boiler are greatly reduced, the occupied area is reduced, and capital investment is reduced for users while the heat exchange efficiency is improved.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. The utility model provides a full premix water-cooling burning vacuum boiler which characterized in that: comprises a base, a boiler body, a water-cooled burner and a condenser; the boiler body is arranged on a base, the boiler body comprises an upper collecting box and a lower collecting box which are arranged up and down, a hearth is connected between the upper collecting box and the lower collecting box, a plurality of water pipes communicated with the upper collecting box and the lower collecting box are arranged in the hearth, and a tubular heat exchanger is arranged above the upper collecting box and communicated with the upper collecting box; this water-cooled combustor sets up on the base and is located furnace's import department, and this water-cooled combustor is full premix combustor, and it is including fire bank, steady flame pipe and communicating pipe, and this fire bank and steady flame pipe are vertical to be set up side by side between last collection box and lower collection box, and this communicating pipe is located the both sides of fire bank and steady flame pipe, the inside cavity of fire bank, steady flame pipe, communicating pipe and with last collection box and lower collection box intercommunication, this condenser sets up on the base and is located furnace's rear, condenser and furnace intercommunication.

2. A fully premixed water cooled combustion vacuum boiler as claimed in claim 1, wherein: the upper header and the lower header are arranged in an up-and-down symmetrical manner.

3. A fully premixed water cooled combustion vacuum boiler as claimed in claim 1, wherein: the lower end of the shell pass of the tubular heat exchanger is provided with an opening and is welded with the opening at the upper end of the upper header, and the tubular heat exchanger is connected with a water outlet and a water return port which are communicated with the shell pass and an exhaust hole which is communicated with the shell pass.

4. A fully premixed water cooled combustion vacuum boiler as claimed in claim 1, wherein: the hearth is a square hearth.

5. A fully premixed water cooled combustion vacuum boiler as claimed in claim 1, wherein: and convection tube bundles which are transversely washed are arranged at the outlet of the hearth, the front side multiple rows of convection tube bundles are light tubes, and the rear side multiple rows of convection tube bundles are spiral finned tubes.

6. A fully premixed water cooled combustion vacuum boiler as claimed in claim 1, wherein: the condenser is internally provided with a plurality of rows of spiral finned tubes which are arranged in a staggered or in-line manner.