CN221648441U - A liquid fuel-based steam boiler combustion system - Google Patents

Abstract

The utility model relates to the field of steam generators, and specifically discloses a liquid fuel-based steam boiler combustion system, including a fuel supply device, a dual-channel fuel nozzle, a coil heat exchange device, a main oil inlet pipeline, a blower and an igniter, wherein the outlet air duct of the blower is at least partially placed in a combustion chamber at the bottom of the coil heat exchange device, an ignition needle on the igniter is placed in the combustion chamber, the dual-channel fuel nozzle is placed in the upper part of the outlet air duct, and one end of the main oil inlet pipeline is connected to one of the channels of the fuel nozzle, and the other end of the main oil inlet pipeline is connected to a fuel supply device with built-in isopentane fuel, a filter, a boost pump and a main control oil valve are sequentially connected in series on the main oil inlet pipeline, and the isopentane fuel can be sprayed out through the fuel nozzle in atomization and mixed with the air in the outlet air duct for combustion. The combustion system has the advantages of being able to reduce the number of components used in the system and simplify the installation and maintenance process.

Description

A liquid fuel-based steam boiler combustion system

Technical Field

The utility model relates to the field of steam generators, in particular to a steam boiler combustion system based on liquid fuel.

Background Art

As is known, in the prior art, steam boilers usually use gas or coke powder as fuel for combustion, and the combustion products contain more carbon compounds. In response to this, a Chinese patent with publication number CN110425522A and publication date 2019-11-08 proposes an environmentally friendly low-nitrogen combustion heat exchange device and a combustion control method thereof, which uses alcohol fuel, and specifically includes a liquid fuel delivery pipeline, a fuel mixing chamber, a flame nozzle, a fan device, and a control device. When working, the control device controls the delivery valve to open, the booster pump works to pump the liquid fuel into the mixing chamber, the electric heater heats the fuel to a certain temperature, and the fan device is connected to the bottom of the mixing chamber for introducing combustion air into the mixing chamber. The combustion air and liquid fuel are fully mixed in the mixing chamber and then ejected by the flame nozzle, and the ignition needle ignites and burns in the combustion chamber of the heat exchange device, thereby generating high-temperature flue gas that can exchange heat with the working medium in the tube.

During the operation of the combustion heat exchange device, if the alcohol liquid fuel is to achieve the effect of full combustion, it is necessary to ensure that the liquid fuel reaches a higher mist spray pressure value, such as 0.3MPa~0.6MPa, before entering the mixing chamber, and the temperature needs to be heated to 50~80℃, otherwise the fuel will flow into the bottom of the inner cavity of the mixing chamber to produce fuel residue or leakage. To this end, the boiler in this scheme needs to use a mixing chamber, atomizing fuel nozzle, flame nozzle, high-performance booster pump, electric heater and other components that meet the requirements of temperature and pressure resistance. The fuel nozzle needs to be embedded in the cavity of the mixing chamber, and the top of the mixing chamber needs to be installed at the bottom of the combustion chamber. Not only are there a large number of parts and components, and the design and manufacturing are high, but the installation and maintenance are also relatively complicated, occupying a large space, and not using intensive management.

Utility Model Content

The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a liquid fuel-based steam boiler combustion system, which has the advantages of being able to reduce the number of components used in the system and simplify the installation and maintenance process.

In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

A liquid fuel-based steam boiler combustion system comprises a fuel supply device, a dual-channel fuel nozzle, a coil heat exchange device, a main oil inlet pipeline, a blower and an igniter, wherein the air outlet duct of the blower is at least partially placed in a combustion chamber at the bottom of the coil heat exchange device, an ignition needle on the igniter is placed in the combustion chamber for igniting atomized fuel, the dual-channel fuel nozzle is placed in the upper part of the air outlet duct, and one end of the main oil inlet pipeline is connected to one of the channels of the fuel nozzle, and the other end of the main oil inlet pipeline is connected to a fuel supply device with built-in isopentane fuel, a filter, a booster pump and a main control oil valve are sequentially connected in series on the main oil inlet pipeline, and after the main control oil valve is opened, the isopentane fuel can be sprayed out through the fuel nozzle in atomization and mixed with the air in the air outlet duct for combustion.

Compared with the prior art, the above technical solution has the following beneficial effects:

The combustion system uses isopentane as the fuel for the coil heat exchange device instead of the alcohol-based fuel in the prior art. Since isopentane liquid fuel has the characteristic of being volatile at room temperature, in the blower outlet duct, the isopentane fuel pressurized by the booster pump can be quickly vaporized and mixed with the hot air in the duct at the moment it is atomized and sprayed from the fuel nozzle, and then burned after ignition by the igniter to achieve heating of the working fluid in the coil. Compared with traditional technology, there is no need to set up additional mixing chambers, flame nozzles, electric heaters and other components, which effectively reduces the manufacturing cost of steam boilers and simplifies the installation and maintenance process.

In order to optimize the above technical solutions, the following technical measures are also taken:

As a preferred embodiment, an electrical control device is further included, and a first oil inlet valve is arranged on the main oil inlet pipeline, and the first oil inlet valve is electrically connected to the electrical control device.

As a preferred embodiment, it also includes an auxiliary oil inlet pipeline connected between the outlet end of the main oil control valve and another passage of the fuel nozzle, and a second oil inlet valve is arranged on the auxiliary oil inlet pipeline.

Through the cooperation of the above-mentioned main oil inlet pipeline and auxiliary oil inlet pipeline, when a fault occurs in the main oil inlet pipeline, the second oil inlet valve is opened, and the fuel or fuel can enter the fuel nozzle through the auxiliary oil inlet pipeline after being pressurized by the booster pump. In this way, while the main oil inlet pipeline is being inspected and repaired, the steam boiler can still work normally, thereby ensuring the reliability of the steam boiler.

As a preferred embodiment, the fuel nozzle is placed in the center of the blower air outlet duct.

As a preferred embodiment, a damper is provided in the air outlet duct of the blower, and a modulation motor for driving the damper to rotate is connected to the damper. An air supply motor for driving the fan blades to rotate is connected to one side of the blower, and the modulation motor and the air supply motor are both electrically connected to the electrical control device.

As a preferred embodiment, the igniter includes a single-needle ignition needle and an ignition transformer connected between the ignition needle and the electrical control device.

As a preferred embodiment, it further comprises a fuel recovery device, which is connected to the outlet end of the boost pump via a fuel recovery pipeline, and a ball valve and a needle valve for adjusting the flow opening are arranged on the fuel recovery pipeline.

As a preferred embodiment, the invention further comprises a flame scanner for detecting the flame condition in the combustion chamber, wherein the flame scanner is electrically connected to the electrical control device.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present utility model, rather than limiting the present utility model.

FIG. 1 is a combustion system diagram of a steam boiler in Embodiment 1.

Reference numerals:

Fuel supply device 1; filter 11; boost pump 12; main control oil valve 13; first oil inlet valve 14a; second oil inlet valve 14b; fuel nozzle 2; coil heat exchange device 3; ignition transformer 4; ignition needle 41; blower 5; air supply motor 51; air outlet duct 52; damper 53; modulation motor 531; electrical control device 6; flame scanner 7; fuel recovery device 8.

DETAILED DESCRIPTION

In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. The components of the embodiments of the utility model described and shown in the drawings herein can be arranged and designed in various different configurations. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition and explanation in the subsequent drawings.

Unless otherwise defined, the technical terms or scientific terms used in this patent document shall be the common meanings understood by people with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the utility model patent specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantity limit, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. It is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

Embodiment 1:

The embodiments of the present application provide a liquid fuel-based steam boiler combustion system, which aims to solve the problems of complex combustion system structure, complicated installation and maintenance process, etc. of alcohol-based fuel hot water boilers in the prior art. It not only effectively reduces the number of parts used in the steam boiler combustion system, further simplifies the structure of the combustion system, reduces the manufacturing cost of the steam boiler, but also facilitates maintenance and installation.

Please refer to Figure 1. The steam boiler combustion system of this embodiment specifically includes a fuel supply device 1, a dual-channel fuel nozzle 2, a coil heat exchange device 3, a main oil inlet pipeline, a blower 5 and an igniter, wherein the igniter includes a single-needle ignition needle 41 and an ignition transformer 4 connected between the ignition needle 41 and the electrical control device 6. The air outlet duct 52 of the blower 5 is at least partially placed in the combustion chamber at the bottom of the coil heat exchange device 3. Here, the air outlet duct can be set in multiple groups and arranged on the inner wall of the combustion chamber at an inclined setting angle. The air volume can be adjusted by the air door opening. The ignition needle 41 on the igniter is placed in the combustion chamber for igniting the atomized fuel. The dual-path fuel nozzle 2 is placed in the upper part of the air outlet duct 52, and one end of the main oil inlet pipeline is connected to one of the paths of the fuel nozzle 2, and the other end of the main oil inlet pipeline is connected to the fuel supply device 1 with built-in isopentane fuel. The filter 11, the boost pump 12 and the main control oil valve 13 are connected in series on the main oil inlet pipeline in sequence. After opening the main control oil valve 13, the isopentane fuel can be sprayed out through the fuel nozzle 2 in atomization and mixed with the air in the air outlet duct 52 for combustion. Preferably, the fuel nozzle 2 is placed in the center of the air outlet duct 52 of the blower 5.

In this embodiment, the combustion system uses isopentane as the fuel of the coil heat exchange device 3 instead of the alcohol-based fuel in the prior art. Here, isopentane is also known as 2-methylbutane, which is a colorless, transparent, volatile liquid with a melting point of -159.4°C and a boiling point of 27.8°C. Since the isopentane liquid fuel has the characteristic of being volatile at room temperature (28°C), in the air outlet duct 52 of the blower 5, the isopentane fuel pressurized by the booster pump 12 can be quickly gasified and mixed with the hot air output by the blower 5 at the moment of atomization and spraying from the fuel nozzle 2, and burns after the ignition of the igniter, thereby realizing the heat output of the burner. Compared with the traditional technology, there is no need to additionally set up a mixing chamber, a flame nozzle, an electric heater and other parts, which effectively reduces the manufacturing cost of the steam boiler and simplifies the installation and maintenance process. Preferably, it also includes a flame scanner 7 for detecting the flame condition in the combustion chamber, and the flame scanner 7 is electrically connected to the electrical control device 6.

In this embodiment, an electrical control device 6 is also included, and a first oil inlet valve 14a is provided on the main oil inlet pipeline, and the first oil inlet valve 14a and the main control oil valve 13 are both electrically connected to the electrical control device 6. An auxiliary oil inlet pipeline connected between the outlet end of the main control oil valve 13 and another passage of the fuel nozzle 2 is also included, and a second oil inlet valve 14b is provided on the auxiliary oil inlet pipeline.

In the above embodiment, when working normally, the ball valve and the booster pump 12 on the main oil inlet pipeline are opened manually, and the electrical control device operates according to the built-in control program to control the main oil valve 13 and the first oil inlet valve 14a to open. The program controls the valve opening and adjusts the fuel flow. The instrument indicates the pressure value, and the fuel is sprayed from the fuel nozzle 2 at a suitable pressure and speed, and is ignited by the ignition needle after being fully mixed with the hot air. When a fault occurs in the main oil inlet pipeline, the second oil inlet valve 14b is opened and the first oil inlet valve 14a is closed at the same time. The fuel or fuel can enter the fuel nozzle 2 through the auxiliary oil inlet pipeline after being pressurized by the booster pump 12. Through the cooperation of the above main oil inlet pipeline and the auxiliary oil inlet pipeline, the steam boiler can still work normally while the main oil inlet pipeline is being repaired, thereby ensuring the reliability of the steam boiler.

In order to facilitate the adjustment of the air supply volume, a damper 53 is provided in the air outlet duct 52 of the blower 5, and the damper 53 is connected to a modulation motor 531 for driving the damper 53 to rotate. One side of the blower 5 is connected to an air supply motor 51 for driving the fan blades to rotate. The modulation motor 531 and the air supply motor 51 are both electrically connected to the electrical control device 6.

In order to facilitate the recovery of fuel or fuel oil, the combustion system further includes a fuel recovery device 8, one end of which is connected to a return oil pump, and the fuel recovery device 8 is connected to the outlet end of a booster pump 12 through a fuel recovery pipeline, and a ball valve and a needle valve for adjusting the flow opening are arranged on the fuel recovery pipeline. When it is necessary to recover the fuel oil in the pipeline, the return oil pump is turned on, the booster pump 12 is turned off, and the ball valve and the needle valve on the recovery pipeline are opened manually or by program control, and the fuel in the pipeline flows back to the fuel recovery device 8.

In summary, in the above embodiment, the combustion system uses isopentane as the combustion fuel of the coil heat exchange device 3. Since the isopentane liquid fuel is volatile at room temperature, in the air outlet duct of the blower 5, the isopentane fuel pressurized by the booster pump 12 can be quickly vaporized and mixed with the hot air in the air duct at the moment of being atomized and sprayed from the fuel nozzle 2, and then burned after being ignited by the igniter, so as to heat the working medium in the coil. This not only effectively reduces the number of parts used in the steam boiler combustion system, further simplifies the structure of the combustion system, but also facilitates installation and maintenance.

The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims (8)

1. The utility model provides a steam boiler combustion system based on liquid fuel, its characterized in that includes fuel supply device, double-passage fuel nozzle, coil pipe heat transfer device, main oil feed pipeline, air-blower and some firearm, wherein the air-out wind channel of air-blower is at least partly arranged in the combustion chamber of coil pipe heat transfer device bottom, ignition needle on the some firearm is arranged in the combustion chamber and is used for igniting atomized fuel, double-passage fuel nozzle is arranged in the upper portion of air-out wind channel, just one of them passageway of this fuel nozzle is connected to main oil feed pipeline's one end, and the other end of this main oil feed pipeline is connected to the fuel supply device of built-in isoamyl fuel, main oil feed pipeline is last in series connection filter, booster pump and the master control oil valve in proper order, open after the master control oil valve the isoamyl fuel can spray through the fuel nozzle and with the interior air mixing combustion of air-out wind channel.

2. The liquid fuel-based steam boiler combustion system of claim 1, further comprising an electrical control device, wherein the main oil feed line is provided with a first oil feed valve, and wherein the first oil feed valve is electrically connected to the electrical control device.

3. The liquid fuel-based steam boiler combustion system according to claim 2, further comprising an auxiliary oil feed line connected between the outlet end of the main control oil valve and the other passage of the fuel nozzle, the auxiliary oil feed line being provided with a second oil feed valve.

4. The liquid fuel based steam boiler combustion system of claim 1, wherein the fuel nozzle is centrally located in the blower outlet air duct.

5. The steam boiler combustion system based on liquid fuel according to claim 2, wherein an air door is arranged in an air outlet duct of the blower, a modulating motor for driving the rotation opening degree of the air door is connected to the air door, one side of the blower is connected with a wind supply motor for driving the fan blade to rotate, and the modulating motor and the wind supply motor are electrically connected with the electric control device.

6. The liquid fuel-based steam boiler combustion system of claim 2, wherein the igniter comprises a single needle ignition needle and an ignition transformer connected between the ignition needle and an electrical control device.

7. The liquid fuel-based steam boiler combustion system according to claim 1, further comprising a fuel recovery device connected to an outlet end of the booster pump through a fuel recovery line, wherein a ball valve and a needle valve for adjusting a flow opening are provided on the fuel recovery line.

8. The liquid fuel-based steam boiler combustion system of claim 2, further comprising a flame scanner for detecting a flame condition within the combustion chamber, the flame scanner being electrically connected to the electrical control device.