阅读说明：本技术 燃烧系统 (Combustion system ) 是由 凌仲秋 周维汉 费明利 高建勋 吴军方 王春生 柳云衡 费晓辉 高雨平 于 2019-09-27 设计创作，主要内容包括：本发明提供了一种燃烧系统,包括：燃料源,燃料源设置有多个,燃料源至少包括第一燃料源和第二燃料源；双蓄热装置,双蓄热装置第一端与第一燃料源连接,双蓄热装置的第二端为工作端；单蓄热装置,单蓄热装置第一端与第二燃料源连接,单蓄热装置的第二端为工作端；控制装置,控制装置同时与双蓄热装置和单蓄热装置连接,以控制双蓄热装置和单蓄热装置的工作状态。本发明的技术方案有效地解决了现有技术中的高炉单一时高炉休风引起的能源介质供应的问题。(the present invention provides a combustion system comprising: the fuel source is provided with a plurality of fuel sources, and the fuel sources at least comprise a first fuel source and a second fuel source; a first end of the double heat storage device is connected with the first fuel source, and a second end of the double heat storage device is a working end; a single thermal storage device, a first end of the single thermal storage device being connected to the second fuel source, a second end of the single thermal storage device being a working end; and the control device is simultaneously connected with the double heat storage devices and the single heat storage device so as to control the working states of the double heat storage devices and the single heat storage device. The technical scheme of the invention effectively solves the problem of energy medium supply caused by blast furnace damping down when the blast furnace is single in the prior art.)

1. A combustion system, comprising:

A plurality of fuel sources, the fuel sources including at least a first fuel source and a second fuel source;

A dual thermal storage device having a first end connected to the first fuel source and a second end that is a working end;

A single thermal storage device, a first end of the single thermal storage device being connected to the second fuel source, a second end of the single thermal storage device being a working end;

A control device connected to both the dual thermal storage device and the single thermal storage device to control the operating states of the dual thermal storage device and the single thermal storage device.

2. the combustion system as claimed in claim 1, wherein the second ends of the double heat storage means and the single heat storage means are in the same position to ensure continuous production work by switching the double heat storage means and the single heat storage means.

3. The combustion system of claim 2 wherein said second fuel source is natural gas and said single thermal storage device comprises a combustion channel, said natural gas and combustion air being mixed and ejected from the same combustion channel to avoid cracking of said natural gas to carbon black in high temperature environments.

4. The combustion system of claim 3, wherein the first fuel source is blast furnace gas, and the amount of combustion air required to combust the natural gas is greater than the amount of combustion air required to combust the blast furnace gas at the same power to ensure heating power when the natural gas is combusted.

5. The combustion system of claim 4 wherein the dual thermal storage device comprises a gas tank that acts as an air thermal storage tank for the single thermal storage device when the single thermal storage device is used.

6. The combustion system of claim 5, wherein the gas tank acts as a smoke evacuation channel for the single thermal storage device when the single thermal storage device is in use.

7. The combustion system of claim 4, wherein the double heat accumulation device further comprises a blast furnace gas main pipe and a fan, an electric blind plate isolating valve is arranged on the blast furnace gas main pipe, and a valve cutting device and a pipeline are arranged at the outlet of the fan, so that the fan is communicated with the blast furnace gas main pipe to form an air conveying channel when the natural gas is used as the fuel.

8. The combustion system of claim 7, wherein the single heat storage device comprises a gas spray gun, the gas spray gun is of a sleeve type structure, the gas spray gun comprises an inner pipe and an outer pipe, the inner pipe and the outer pipe are both made of heat-resistant steel, the inner pipe is a channel of the natural gas, the outer pipe is a channel of the combustion air, and outlets of the inner pipe and the outer pipe are provided with reverse rotators.

9. The combustion system of claim 8 wherein a cooling tube is connected in parallel to the outside of the outer tube to form an air passage for cooling the outer tube.

10. The combustion system of claim 9, wherein when natural gas is used as fuel, the control of single heat accumulation type reversing control plus pulse control is adopted to improve the control accuracy of the furnace temperature.

Technical Field

The invention relates to the technical field of industrial furnace equipment, in particular to a combustion system.

Background

At present, the main method for utilizing low-heat value blast furnace gas in industrial furnace design is to preheat the blast furnace gas and combustion air to over 1000 ℃ by using a double heat storage method, thereby improving the theoretical combustion temperature of fuel and meeting the requirements of steel rolling production.

The heat accumulating type combustion technology, exactly called heat accumulating type heat exchange combustion technology, belongs to unstable state heat transfer, and utilizes refractory material as a carrier to be heated by waste gas heat alternately. The heat stored in the heat accumulator is used for heating the air and the coal gas, so that the air and the coal gas are preheated at high temperature, and the efficiency of waste heat recovery is achieved. Because the heat accumulators are periodically heated and release heat, the heat accumulators must be arranged in pairs in order to ensure the heating continuity of the hearth. Meanwhile, a reversing device is needed to finish alternate heating and heat release of the heat accumulator. Fig. 1 and 2 show a dual heat accumulation control flowchart.

Because the air and coal gas can be preheated to about 1000 ℃, the temperature of the discharged waste gas is below 150 ℃, and the recovery rate of waste heat reaches the limit value. Compared with the traditional combustion technology, the energy-saving effect is obvious, the average energy-saving rate is more than 30%, and low-heat value and cheap fuel can be fully utilized, so that the production cost is greatly reduced. The method not only reduces the emission of the surplus blast furnace gas of the iron and steel enterprises, but also saves the energy, thereby being an advanced technology meeting the current resource and environmental requirements. For a large-scale integrated iron and steel enterprise, because a plurality of blast furnaces are arranged, the phenomenon of blast furnace gas supply interruption does not exist, and the problem that the blast furnace gas supply is not caused by blast furnace damping down is avoided.

However, for some special steel enterprises with single blast furnace, energy medium supply problems caused by blast furnace damping down must be considered when the double heat accumulation technology is adopted to utilize blast furnace gas.

Disclosure of Invention

The invention mainly aims to provide a combustion system to solve the problem of energy medium supply caused by blast furnace damping down when a blast furnace is single in the prior art.

In order to achieve the above object, the present invention provides a combustion system comprising: the fuel source is provided with a plurality of fuel sources, and the fuel sources at least comprise a first fuel source and a second fuel source; a first end of the double heat storage device is connected with the first fuel source, and a second end of the double heat storage device is a working end; a single thermal storage device, a first end of the single thermal storage device being connected to the second fuel source, a second end of the single thermal storage device being a working end; and the control device is simultaneously connected with the double heat storage devices and the single heat storage device so as to control the working states of the double heat storage devices and the single heat storage device.

further, the second end positions of the double heat storage devices and the single heat storage device are the same, so that continuous production work is ensured by switching the double heat storage devices and the single heat storage device.

Furthermore, the second fuel source is natural gas, the single heat storage device comprises a combustion channel, and the natural gas and the combustion air are mixed and then sprayed out from the same combustion channel, so that the natural gas is prevented from being cracked into carbon black in a high-temperature environment.

Further, the first fuel source is blast furnace gas, and the amount of combustion-supporting air required for burning natural gas is larger than that for burning the blast furnace gas under the same power, so that the heat supply power during burning natural gas is guaranteed.

Further, the double heat storage device comprises a gas tank, and when the single heat storage device is used, the gas tank is used as an air heat storage tank of the single heat storage device.

Further, when a single heat storage device is used, the gas tank serves as a smoke exhaust channel of the single heat storage device.

Furthermore, the double heat storage devices also comprise a blast furnace gas main pipe and a fan, wherein an electric blind plate isolating valve is arranged on the blast furnace gas main pipe, and a valve cutting device and a pipeline are arranged at the outlet of the fan, so that the fan is communicated with the blast furnace gas main pipe to form an air conveying channel when natural gas is used as fuel.

Further, single heat accumulation device includes the gas spray gun, and the gas spray gun is bushing type structure, and the gas spray gun includes inner tube and outer tube, and inner tube and outer tube all adopt heat-resistant steel to make, and the inner tube is the passageway of natural gas, and the outer tube is combustion air's passageway, and the export of inner tube and outer tube sets up the reverse rotation ware.

Further, a cooling pipe is connected in parallel to the outside of the outer pipe to form an air passage for cooling the outer pipe.

Furthermore, when natural gas is used as fuel, single heat accumulation type reversing control and pulse control are adopted, so that the control precision of the furnace temperature is improved.

By applying the technical scheme of the invention, after a plurality of fuel sources are arranged, the fuel sources of the blast furnace can have more choices. The arrangement of the double heat storage devices and the single heat storage device can meet the use requirements of different fuel sources. The control device can control or switch the double heat storage devices and the single heat storage device to meet heat supply requirements in different periods, so that the problem of energy medium supply caused by damping down of the blast furnace is solved. The technical scheme of the invention effectively solves the problem of energy medium supply caused by blast furnace damping down when the blast furnace is single in the prior art.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

Fig. 1 and 2 show a flow chart of the use of dual thermal storage devices in a combustion system.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.

A combustion system in this embodiment includes a fuel source, a dual thermal storage device, a single thermal storage device, and a control device. The fuel source is provided in plurality, and the fuel source includes at least first fuel source and second fuel source. A first end of the dual thermal storage device is connected to a first fuel source and a second end of the dual thermal storage device is a working end. The first end of the single thermal storage device is connected to the second fuel source and the second end of the single thermal storage device is the working end. The control device is simultaneously connected with the double heat storage devices and the single heat storage device so as to control the working states of the double heat storage devices and the single heat storage device.

by applying the technical scheme of the embodiment, after a plurality of fuel sources are arranged, the fuel sources of the blast furnace can have more choices. The arrangement of the double heat storage devices and the single heat storage device can meet the use requirements of different fuel sources. The control device can control or switch the double heat storage devices and the single heat storage device to meet heat supply requirements in different periods, so that the problem of energy medium supply caused by damping down of the blast furnace is solved. The technical scheme of this embodiment has solved the problem of the energy medium supply that blast furnace damping down arouses when the blast furnace is single among the prior art effectively.

In the technical scheme of the embodiment, the positions of the second ends of the double heat storage devices and the single heat storage device are the same, so that continuous production operation is ensured by switching the double heat storage devices and the single heat storage device. The structure can ensure that the double heat storage devices and the single heat storage device have a common working end, so that the continuous working state can be ensured by switching the double heat storage devices and the single heat storage device, and the condition that the work cannot be continued after the energy medium is supplied due to damping down of the blast furnace is avoided.

In the technical scheme of this embodiment, the second fuel source is natural gas, the single heat storage device comprises a combustion channel, and the natural gas and the combustion air are mixed and then sprayed out from the same combustion channel, so as to avoid the natural gas from cracking into carbon black in a high-temperature environment. The structure is based on the characteristics of the heat accumulating type burner, the normal use of the blast furnace gas as fuel can be recovered when the supply of the blast furnace gas is normal, and the phenomenon that the furnace generates black smoke due to the fact that natural gas is easy to crack into carbon black in a high-temperature environment is considered. This can be avoided by using a single heat store.

In the technical scheme of this embodiment, the first fuel source is blast furnace gas, and the amount of combustion air required for burning natural gas is greater than that for burning blast furnace gas under the same power, so as to ensure the heating power when burning natural gas. The mode can ensure that the heating power when the natural gas is combusted is the same as or similar to the power when the blast furnace gas is combusted, so that the working state of the switched combustion system can not be changed greatly, and the stability of operation is ensured.

In the technical scheme of this embodiment, two heat accumulation devices include the gas chamber, and when using single heat accumulation device, the gas chamber is as the air heat accumulation case of single heat accumulation device. Because the volume of the gas box of the blast furnace gas double heat accumulation burner is larger than that of the air box, the gas box is considered to be used as the air heat accumulation box so as to reduce the reconstruction cost and the production cost.

In the technical scheme of this embodiment, when the single heat storage device is used, the gas tank is used as a smoke exhaust channel of the single heat storage device. When natural gas is used as fuel in the mode, the volume of smoke is reduced by using coal gas with higher volume as fuel, and the requirement can be met by using a coal gas box as a smoke exhaust channel through calculation. Can reduce the transformation cost of reforming into mixing arrangement with traditional two heat accumulation devices like this, improve and reform transform efficiency.

In the technical scheme of this embodiment, the double heat storage devices further include a blast furnace gas main pipe and a fan, an electric blind plate isolating valve is arranged on the blast furnace gas main pipe, and a valve cutting device and a pipeline are arranged at an outlet of the fan, so that the fan is communicated with the blast furnace gas main pipe to form an air conveying channel when natural gas is used as fuel. Above-mentioned structure is for the transformation that carries out as two of single heat accumulation device's exhaust stack with the gas chamber, can further reduce like this and reform transform the transformation cost of mixing arrangement with two heat accumulation devices of tradition, improves and reforms transform efficiency.

In the technical scheme of this embodiment, single heat accumulation device includes the gas spray gun, and the gas spray gun is bushing type structure, and the gas spray gun includes inner tube and outer tube, and inner tube and outer tube all adopt heat-resistant steel to make, and the inner tube is the passageway of natural gas, and the outer tube is combustion air's passageway, and the export of inner tube and outer tube sets up the reverse rotation ware. The gas spray gun in the structure can work at high temperature for a long time after being inserted into the gas heat storage box. The heat-resistant steel material can improve the high-temperature resistance of the inner pipe and the outer pipe of the gas spray gun.

In the technical scheme of this embodiment, the cooling pipe is connected in parallel outside the outer pipe to form the air passage for cooling the outer pipe. The structure can rapidly cool the gas spray gun which does not work, and the working efficiency of the combustion system is improved.

in the technical scheme of the embodiment, when natural gas is used as fuel, single heat accumulation type reversing control and pulse control are adopted to improve the control precision of the furnace temperature. The structure can ensure the control precision of the furnace temperature, and in order not to influence the original operation habit, when the blast furnace gas is used as the fuel, the original control system is still used, and when the natural gas is used as the fuel, the system is switched to a natural gas single heat storage combustion control system on a screen. The natural gas combustion control system adopts a pulse control mode, controls the furnace temperature in a mode of adjusting the duty ratio, and adjusts the air flow and the natural gas flow of each section to realize the adjustment of the air-fuel ratio.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: by applying the technical scheme of the invention, after a plurality of fuel sources are arranged, the fuel sources of the blast furnace can have more choices. The arrangement of the double heat storage devices and the single heat storage device can meet the use requirements of different fuel sources. The control device can control or switch the double heat storage devices and the single heat storage device to meet heat supply requirements in different periods, so that the problem of energy medium supply caused by damping down of the blast furnace is solved. The technical scheme of the invention effectively solves the problem of energy medium supply caused by blast furnace damping down when the blast furnace is single in the prior art.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.