CN214469355U

CN214469355U - Full premix burning ultralow nitrogen condensation vacuum boiler

Info

Publication number: CN214469355U
Application number: CN202120554684.5U
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: 2021-10-22
Anticipated expiration: 2031-03-18

Abstract

The utility model discloses a full premix burning ultra-low nitrogen condensation vacuum boiler, which comprises a boiler shell, a combustion chamber, a burner, a convection bank, a rear smoke box and a condenser; the burner extends into the combustion chamber, the convection bank is positioned behind the combustion chamber, the front end of the convection bank is communicated with the combustion chamber, the rear smoke box is positioned behind the convection bank, and the rear smoke box is communicated with the rear end of the convection bank; this condenser is located the rear of back smoke box, the condenser is including casing and a plurality of interior finned tube, cross the rear at back smoke box and set up the condenser, the condenser feedwater is the system return water, the flue waste heat that utilizes that can be better, reduce the temperature of discharging fume, the condenser adopts interior finned tube, flue gas environmental corrosion resistance, durable, the condenser discrepancy water is direct to be linked together with the boiler return water, in time convenient utilization heat transfer energy, the energy-conserving effect that has showing, another effect of flue gas condensation can also reduce NOx's emission.

Description

Full premix burning ultralow nitrogen condensation vacuum boiler

Technical Field

The utility model relates to a vacuum boiler field technique especially indicates a full premix burning ultralow nitrogen condensation 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 gas temperature of the conventional 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 in practical application, and the exhaust gas of the gas boiler contains about 15-19% (volume) of water vapor, which is the main carrier of the heat of the exhaust gas. If the exhaust gas temperature of the boiler is reduced to a certain level, the superheated steam in the flue gas can be condensed to release latent heat of vaporization, the boiler which enables the latent heat of vaporization in the flue gas to be recycled is called as a condensing boiler, the flue gas in the existing condensed water boiler flows in a hollow flue pipe to complete heat exchange, and the heat exchange efficiency is low in the form of the heat exchange, and the liquid water formed after the heat release and condensation of the steam is easy to corrode the flue pipe, so that the service life of the boiler is influenced.

The traditional vacuum boiler adopts a flue gas recirculation diffusion type ultralow nitrogen combustion system, the diameter of a hearth is large, the length is long, the size of the boiler is increased, and the burner is unstable due to the fact that a large amount of condensed water is generated after flue gas and cold air are mixed. In addition, because of more factors influencing combustion, such as flow and temperature fluctuation of the recirculated flue gas, the flue gas recirculation diffusion type combustion system is difficult to achieve the effect of low-nitrogen emission.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a fully premixed combustion vacuum boiler with ultra-low nitrogen condensation, which can effectively solve the problems of large volume and low nitrogen emission effect.

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

a full-premix combustion ultra-low nitrogen condensation vacuum boiler comprises a boiler shell, a combustion chamber, a burner, a convection bank, a rear smoke box and a condenser; the boiler shell is provided with a mounting cavity; the combustion chamber, the combustor, the convection bank, the rear smoke box and the condenser are all arranged in the installation cavity, the combustor extends into the combustion chamber, the convection bank is located behind the combustion chamber, the front end of the convection bank is communicated with the combustion chamber, the rear smoke box is located behind the convection bank, and the rear smoke box is communicated with the rear end of the convection bank; the condenser is located at the rear of the rear smoke box and comprises a shell and a plurality of inner finned tubes, the shell is provided with a water cavity, the shell is provided with a smoke outlet and a water inlet and a water outlet which are communicated with the water cavity, the plurality of inner finned tubes are arranged in the water cavity, the front ends of the inner finned tubes are communicated with the rear smoke box, and the rear ends of the inner finned tubes are communicated with the smoke outlet.

Preferably, the burner is a fully premixed metal fiber burner.

Preferably, the rear side of the combustion chamber is provided with a furnace flue top, the convection bank is composed of a plurality of hollow smoke pipes, the hollow smoke pipes are all fixed on the furnace flue top, and the convection bank is a light pipe or an inner finned pipe.

Preferably, the condenser is internally communicated with system backwater, the flow direction of the system backwater is opposite to the flow direction of the flue gas, the water outlet of the condenser is connected to the water inlet pipeline of the heat exchanger, and the outlet water directly enters the boiler.

Preferably, the heat exchanger is located above the combustion chamber and the convection bank.

Preferably, the condenser is integrated with the rear smoke box.

Preferably, a fan is arranged in the boiler shell and communicated with the combustor.

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

set up the condenser through the rear at the back smoke box, the condenser feedwater is the system return water, the flue waste heat of utilization that can be better, reduce exhaust gas temperature, the condenser adopts the inner finned tube, flue gas environment corrosion resistance, durable, the condenser discrepancy water is direct to be linked together with the boiler return water, in time convenient utilization heat transfer energy, the energy-conserving effect that is showing, another effect of flue gas condensation can also reduce NOx's emission, this one side is because the improvement of condensing boiler thermal efficiency, the consumption of fuel has been reduced, the total emission has been reduced, on the other hand is because the condensate is to NOx's absorption, the emission has further been reduced again, can see that this boiler has fine economy and environmental benefit.

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 transverse cross-sectional view of a preferred embodiment of the invention;

fig. 2 is a vertical cross-sectional view of the preferred embodiment of the present invention.

The attached drawings indicate the following:

10. boiler shell 11 and installation cavity

20. Combustion chamber 21, furnace roof

30. Burner 40, convection bank

41. Hollow smoke tube 50, back smoke box

60. Condenser 61, casing

62. Inner finned tube 601 and water cavity

602. Smoke outlet 603, water inlet

604. Water outlet 70 and heat exchanger

80. Fan blower

Detailed Description

Referring to fig. 1 and 2, the structure of the preferred embodiment of the present invention is shown, which includes a boiler housing 10, a combustion chamber 20, a burner 30, a convection bank 40, a rear smoke box 50 and a condenser 60.

The boiler housing 10 has a mounting chamber 11; the combustion chamber 20, the burner 30, the convection bank 40, the rear smoke box 50 and the condenser 60 are all arranged in the installation cavity 11, the burner 30 extends into the combustion chamber 20, the convection bank 40 is positioned behind the combustion chamber 20, the front end of the convection bank 40 is communicated with the combustion chamber 20, the rear smoke box 50 is positioned behind the convection bank 40, and the rear smoke box 50 is communicated with the rear end of the convection bank 40; in this embodiment, the rear side of the combustion chamber 20 has a furnace roof 21, the convection bank 40 is composed of a plurality of hollow smoke pipes 41, the plurality of hollow smoke pipes 41 are all fixed on the furnace roof 21, and the convection bank is a light pipe or an inner finned pipe; the combustor 30 is a fully premixed metal fiber combustor, the flame length is short, and the diameter and the length of the combustion chamber 20 are greatly reduced, so that the convection bank 40 is arranged at the top end of the combustion chamber 20, the boiler volume is greatly reduced, the occupied area of the boiler is reduced, and the capital investment cost is saved for users.

This condenser 60 is located the rear of back smoke box 50, and condenser 60 is including casing 61 and a plurality of interior finned tube 62, and this casing 61 has a water cavity 601, has seted up the water inlet 603 and the delivery port 604 of exhaust port 602 and intercommunication water cavity 601 on the casing 61, and these a plurality of interior finned tubes 62 set up in water cavity 601, and the front end of each interior finned tube 62 all communicates with back smoke box 50, and the rear end of each interior finned tube 62 all communicates exhaust port 602. In this embodiment, the condenser 60 and the rear smoke box 50 are integrated, the condenser 60 is filled with system return water, the flow direction of the system return water is opposite to the flow direction of the smoke, the water outlet 604 of the condenser 60 is connected to the water inlet pipeline of the heat exchanger 70, the outlet water directly enters the boiler, and the heat exchanger 70 is located above the combustion chamber 20 and the convection bank 40.

In addition, a fan 80 is disposed in the boiler housing 10, the fan 80 is communicated with the burner 30, and the fan 80 is used for feeding the air and the natural gas mixed together into the burner 30.

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

when the boiler is in operation, the fan 80 sends the mixed air and natural gas into the combustor 30, the mixed air and natural gas are combusted in the combustion chamber 20 through the combustor 30, high-temperature flue gas generated by combustion sequentially enters the convection tube bundle 40, the rear smoke box 50 and the condenser 60, the high-temperature flue gas is discharged to a chimney through the smoke outlet 602 after heat exchange is completed in the condenser 60, the high-temperature flue gas is cooled by system water in the inner finned tubes 62 in the condenser 60, 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 thermal efficiency is improved by about 10% -12%.

The utility model discloses a design key is: set up the condenser through the rear at the back smoke box, the condenser feedwater is the system return water, the flue waste heat of utilization that can be better, reduce exhaust gas temperature, the condenser adopts the inner finned tube, flue gas environment corrosion resistance, durable, the condenser discrepancy water is direct to be linked together with the boiler return water, in time convenient utilization heat transfer energy, the energy-conserving effect that is showing, another effect of flue gas condensation can also reduce NOx's emission, this one side is because the improvement of condensing boiler thermal efficiency, the consumption of fuel has been reduced, the total emission has been reduced, on the other hand is because the condensate is to NOx's absorption, the emission has further been reduced again, can see that this boiler has fine economy and environmental benefit.

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 burning ultralow nitrogen condensation vacuum boiler which characterized in that: comprises a boiler shell, a combustion chamber, a burner, a convection bank, a rear smoke box and a condenser; the boiler shell is provided with a mounting cavity; the combustion chamber, the combustor, the convection bank, the rear smoke box and the condenser are all arranged in the installation cavity, the combustor extends into the combustion chamber, the convection bank is located behind the combustion chamber, the front end of the convection bank is communicated with the combustion chamber, the rear smoke box is located behind the convection bank, and the rear smoke box is communicated with the rear end of the convection bank; the condenser is located at the rear of the rear smoke box and comprises a shell and a plurality of inner finned tubes, the shell is provided with a water cavity, the shell is provided with a smoke outlet and a water inlet and a water outlet which are communicated with the water cavity, the plurality of inner finned tubes are arranged in the water cavity, the front ends of the inner finned tubes are communicated with the rear smoke box, and the rear ends of the inner finned tubes are communicated with the smoke outlet.

2. The fully premixed combustion ultra-low nitrogen condensation vacuum boiler as claimed in claim 1, wherein: the combustor is a fully premixed metal fiber combustor.

3. The fully premixed combustion ultra-low nitrogen condensation vacuum boiler as claimed in claim 1, wherein: the rear side of the combustion chamber is provided with a furnace liner top, the convection bank is composed of a plurality of hollow smoke tubes, the hollow smoke tubes are all fixed on the furnace liner top, and the convection bank is a light pipe or an inner finned pipe.

4. The fully premixed combustion ultra-low nitrogen condensation vacuum boiler as claimed in claim 1, wherein: the condenser is internally communicated with system backwater, the flow direction of the system backwater is opposite to the flow direction of the flue gas, the water outlet of the condenser is connected to the water inlet pipeline of the heat exchanger, and the outlet water directly enters the boiler.

5. The fully premixed combustion ultra-low nitrogen condensation vacuum boiler as claimed in claim 4, wherein: the heat exchanger is located above the combustion chamber and the convection bank.

6. The fully premixed combustion ultra-low nitrogen condensation vacuum boiler as claimed in claim 1, wherein: the condenser and the rear smoke box are arranged into a whole.

7. The fully premixed combustion ultra-low nitrogen condensation vacuum boiler as claimed in claim 1, wherein: a fan is arranged in the boiler shell and communicated with the combustor.