Mixed-combustion-type glass melting furnace

Abstract

A mixed-combustion-type glass melting furnace, comprising a high-calorific-value fuel combustion zone (1), a low-calorific-value fuel combustion zone (2), and a fining zone (3) which are sequentially arranged from front to back, wherein the high-calorific-value fuel combustion zone (1) and the low-calorific-value fuel combustion zone (2) are used for fuel combustion for heating, the heat released by fuel in the high-calorific-value fuel combustion zone (1) being at least twice the heat released by fuel in the low-calorific-value fuel combustion zone (2).

Description

A mixed combustion glass melting furnace Technical Field

[0001] The present invention relates to the technical field of glass production, and in particular to a mixed combustion glass melting furnace. Background Art

[0002] In the glass production industry, most melting furnaces use only one type of fuel and combustion-supporting material to provide energy for normal production. Some furnaces in the glass industry use preheated producer gas and preheated air for combustion, some use natural gas and preheated air for combustion, and some use natural gas and pure oxygen for combustion.

[0003] China is a country rich in coal resources, especially in North and Northwest China. Glass factories can directly use coal to make producer gas, which is then preheated in a regenerator before burning in the glass melting furnace. However, due to the low calorific value of producer gas, the heating intensity of the batch material is low, resulting in poor melting of the batch material in front of the feed port and a long boundary between the material pile and the bubble. The production quality of glass melting furnaces using producer gas is not as good as that of glass melting furnaces using higher calorific value fuels (such as natural gas). At the same time, the maximum daily melting capacity of producer gas glass melting furnaces does not exceed 800t / d.

[0004] Publication No. CN116002954A discloses a glass melting furnace. By providing an inspection chamber in the feeding device, it is possible to clear material blockages in the feeding pipe without disassembling the entire feeding pipe, which reduces the workload and facilitates maintenance and inspection of the glass melting furnace feeding device. Furthermore, by installing a flue gas denitrification device on the exhaust pipe, it solves the problem of incomplete denitrification reaction caused by uneven mixing of ammonia and flue gas in existing flue gas denitrification methods, thus meeting the needs of flue gas denitrification treatment in glass melting furnaces.

[0005] Publication No. CN115677177A discloses a glass melting furnace system. A combustion lance is provided on each side wall of a charging pool of the glass furnace. The charging pool and the combustion space within the glass furnace are interconnected. A transport pipe is connected to the muzzles of the two combustion lances. The transport pipe has multiple gas outlets on the side facing the charging pool. During use, hydrogen enters the combustion lances, then enters the transport pipe through the combustion lances, and then enters the charging pool area through the transport pipe. The combustion lances are used to introduce hydrogen into the charging pool as fuel, preheating it and improving thermal efficiency.

[0006] In order to utilize abundant coal resources, glass factories can directly use coal to reduce coal processing links, reduce energy consumption and effectively utilize resources. Increasing the melting capacity and glass quality of producer gas glass melting furnaces, thereby reducing unit energy consumption, is a way to save energy and reduce carbon emissions.

[0007] Summary of the Invention

[0008] In view of this, facing the deficiencies of the prior art, the object of the present invention is to provide a mixed combustion glass melting furnace that overcomes the defects of low production quality and small daily melting volume of the producer gas glass melting furnace.

[0009] The technical solution adopted by the present invention is to provide the following technical solutions to achieve the above-mentioned and other related purposes:

[0010] A mixed combustion glass melting furnace includes a high calorific value fuel combustion zone, a low calorific value fuel combustion zone, and a clarification zone arranged in sequence from front to back, and the high calorific value fuel combustion zone and the low calorific value fuel combustion zone are used for fuel combustion heating, wherein the heat released by the fuel in the high calorific value fuel combustion zone is more than twice the heat released by the fuel in the low calorific value fuel combustion zone.

[0011] A technical solution provided by this application also has the following technical features:

[0012] Preferably, fuel and oxygen inlets are provided on both sides of the high calorific value fuel combustion zone, and both sides of the high calorific value fuel combustion zone are burned, and fuel and oxygen inlets are provided on one side of the low calorific value fuel combustion zone, and one side of the low calorific value fuel combustion zone is burned.

[0013] Preferably, the heat generated by the high calorific value fuel combustion zone accounts for more than 20% of the heat of the total fuel supplied to the glass melting furnace.

[0014] Preferably, the high calorific value fuel combustion zone uses fuel and oxygen for combustion, and the calorific value of the fuel in the high calorific value fuel combustion zone is 5 times or more than the calorific value of the fuel in the low calorific value fuel combustion zone.

[0015] Preferably, the fuel in the high calorific value fuel combustion zone is a gas fuel with a calorific value greater than 8000 kcal / Nm3 or / and a liquid fuel with a calorific value greater than 8000 kcal / Nm3.

[0016] Preferably, the purity of the oxygen used in the high calorific value fuel combustion zone is greater than 80%.

[0017] Preferably, the low calorific value fuel combustion zone uses fuel and high temperature air for combustion.

[0018] Preferably, the low calorific value fuel combustion zone uses a gas fuel having a calorific value greater than 1300 kcal / Nm.

[0019] Preferably, when the calorific value of the fuel used in the low calorific value fuel combustion zone is lower than 4000 kcal / Nm, the fuel is preheated to above 1000° C. before combustion.

[0020] Preferably, the high-temperature air in the low calorific value fuel combustion zone is room temperature air heated to 1000° C. or above.

[0021] The beneficial effects of the present invention have the following characteristics:

[0022] The present invention utilizes high calorific value fuel and low calorific value fuel; high calorific value fuel is used in the high calorific value fuel combustion zone in the front of the melting furnace and high concentration of oxygen is used for combustion assistance. The high flame temperature can quickly generate a glass phase on the surface of the batch material, and the glass phase covers the batch material, reducing the scattering of fine powder in the batch material and reducing the blockage of the heat storage equipment in the low calorific value fuel zone; a low calorific value fuel combustion zone is set in the middle of the melting furnace, and the fuel heats the batch material that has been covered by the glass phase and provides energy for the clarification zone at the same time, making full use of cheap low calorific value fuel and rationally utilizing resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic structural diagram of a mixed combustion glass melting furnace of the present invention;

[0024] FIG2 is a schematic diagram of the AA cross-sectional structure of a mixed combustion glass melting furnace of the present invention;

[0025] FIG3 is a schematic diagram of the BB cross-sectional structure of a mixed combustion glass melting furnace of the present invention;

[0026] FIG4 is a CC-sectional structural diagram of a mixed combustion glass melting furnace of the present invention;

[0027] FIG5 is a CC-sectional structural diagram of a mixed combustion glass melting furnace of the present invention;

[0028] In the picture:

[0029] 1. High calorific value fuel combustion area

[0030] 2. Low calorific value fuel combustion area

[0031] 3. Clarification area. DETAILED DESCRIPTION

[0032] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0036] As shown in Figure 1-5, a mixed combustion glass melting furnace includes a high calorific value fuel combustion zone 1, a low calorific value fuel combustion zone 2, and a clarification zone 3 arranged in sequence from front to back, and the high calorific value fuel combustion zone 1 and the low calorific value fuel combustion zone 2 are used for fuel combustion heating, wherein the heat released by the fuel in the high calorific value fuel combustion zone 1 is more than twice the heat released by the fuel in the low calorific value fuel combustion zone 2.

[0037] The present application has the following characteristics: a glass melting furnace utilizes both high calorific value fuel and low calorific value fuel; high calorific value fuel is used at the front of the melting furnace and high concentration of oxygen is used for combustion assistance. The high flame temperature can quickly generate a glass phase on the surface of the batch material. The glass phase covers the batch material, reduces the scattering of fine powder in the batch material, and reduces the blockage of the heat storage equipment in the low calorific value fuel area; a low calorific value fuel combustion area 2 is set in the middle of the melting furnace, and the fuel heats the batch material that has been covered by the glass phase, and provides energy for the clarification zone at the same time, making full use of cheap low calorific value fuel and making rational use of resources.

[0038] Specifically, fuel and oxygen inlets are provided on both sides of the high calorific value fuel combustion zone 1, and both sides of the high calorific value fuel combustion zone 1 are burned; fuel and oxygen inlets are provided on one side of the low calorific value fuel combustion zone 2, and one side of the low calorific value fuel combustion zone 2 is burned; the heat of combustion in the high calorific value fuel combustion zone 1 accounts for more than 20% of the heat of the total fuel supplied to the glass melting furnace; the high calorific value fuel combustion zone 1 uses fuel and oxygen for combustion, and the calorific value of the fuel in the high calorific value fuel combustion zone 1 is 5 times or more than the calorific value of the fuel in the low calorific value fuel combustion zone 2; the calorific value of the fuel in the high calorific value fuel combustion zone 1 is greater than 8000kcal / Nm gas fuel or / and liquid fuel with a calorific value greater than 8000kcal / Nm; the purity of oxygen used in the high calorific value fuel combustion zone 1 is greater than 80%; the low calorific value fuel combustion zone 2 uses fuel and high-temperature air for combustion; the calorific value of the fuel used in the low calorific value fuel combustion zone 2 is a gas fuel with a calorific value greater than 1300kcal / Nm; when the calorific value of the fuel used in the low calorific value fuel combustion zone 2 is lower than 4000kcal / Nm, the fuel is preheated to above 1000℃ before combustion; the high-temperature air in the low calorific value fuel combustion zone 2 is room temperature air heated to 1000℃ or above.

[0039] Specifically, the high calorific value fuel combustion zone 1 at the front of the glass melting furnace is equipped with 2 or more pairs of natural gas and high-purity oxygen combustion devices in the front of the high calorific value fuel combustion zone 1, and the combustion devices on both sides burn continuously during operation; the low calorific value fuel combustion zone 2 in the middle is equipped with 4 or more pairs of high-temperature generator gas and high-temperature air combustion devices, which burn on one side and discharge the flue gas in the kiln on the other side during operation, and the direction is reversed every 20 minutes; the rear of the glass melting furnace is a clarification zone without fuel heating.

[0040] Specifically, the combustion arrangement of the glass kiln is basically the same as before, with the difference being that 4 or more pairs of normal temperature natural gas and high temperature air combustion devices are set in the low calorific value fuel combustion zone 2 in the middle. During operation, one side burns and the other side discharges the flue gas in the kiln, and the direction is reversed every 20 minutes.

[0041] In general, this technical solution involves setting up a high-calorific value fuel combustion zone and a low-calorific value fuel combustion zone in the melting furnace, achieving heating and fuel supply through mixed combustion. The high-calorific value fuel combustion zone uses high-calorific value fuel and high-concentration oxygen to provide a high-temperature flame, which rapidly melts the batch material, reduces the dispersion of fine powder, and reduces the blockage of the heat storage equipment in the low-calorific value fuel combustion zone. The low-calorific value fuel combustion zone uses cheap low-calorific value fuel to heat the batch material covered by the glass phase, while providing energy for the clarification zone.

[0042] The production quality of the glass melting furnace is improved, the dispersion of fine powder is reduced, and the quality of glass is improved; the mixed combustion of high calorific value and low calorific value fuels is used to reduce energy consumption and carbon emissions, meeting the requirements of energy conservation and carbon reduction; and the low calorific value fuel is fully utilized to achieve the rational use of resources.

[0043] With regard to the technical solution of this application, further optimization of oxygen purity is considered: in order to ensure the efficiency of the high calorific value fuel combustion zone, it is possible to consider further improving the purity of oxygen to enhance the combustion effect and increase the flame temperature; preheating of low calorific value fuel: for the case where the calorific value of low calorific value fuel is low, a preheating system is introduced to preheat the fuel to a higher temperature to improve its combustion efficiency; waste heat recovery: consider introducing waste heat recovery technology in the melting furnace system to make full use of the waste heat generated and further improve energy utilization efficiency; monitoring and automation: introduce advanced monitoring and automation systems to monitor parameters such as flame temperature and fuel supply in real time, so as to optimize the combustion process and reduce energy consumption.

[0044] The technical solution of this application is a feasible way to achieve energy conservation and carbon reduction in the glass production industry. Through continuous improvement and innovation, this goal can be better achieved, while contributing to environmental protection and effective resource utilization.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A mixed combustion glass melting furnace, characterized in that: The invention comprises a high calorific value fuel combustion zone (1), a low calorific value fuel combustion zone (2), and a clarification zone (3) which are arranged in sequence from front to back, and the high calorific value fuel combustion zone (1) and the low calorific value fuel combustion zone (2) are used for fuel combustion heating, wherein the heat released by the fuel in the high calorific value fuel combustion zone (1) is more than twice the heat released by the fuel in the low calorific value fuel combustion zone (2).

2. A mixed combustion glass melting furnace as claimed in claim 1, characterized in that: Fuel and oxygen inlets are provided on both sides of the high calorific value fuel combustion zone (1), and both sides of the high calorific value fuel combustion zone (1) are burned; fuel and oxygen inlets are provided on one side of the low calorific value fuel combustion zone (2), and one side of the low calorific value fuel combustion zone (2) is burned.

3. A mixed combustion glass melting furnace as claimed in claim 1, characterized in that: The heat generated by the high calorific value fuel combustion zone (1) accounts for more than 20% of the heat of the total fuel supplied to the glass melting furnace.

4. A mixed combustion glass melting furnace as claimed in claim 1, characterized in that: The high calorific value fuel combustion zone (1) uses fuel and oxygen for combustion, and the calorific value of the fuel in the high calorific value fuel combustion zone (1) is 5 times or more than the calorific value of the fuel in the low calorific value fuel combustion zone (2).

5. A mixed combustion glass melting furnace as claimed in claim 1, characterized in that: The fuel in the high calorific value fuel combustion zone (1) is a gas fuel with a calorific value greater than 8000 kcal / Nm3 or / and a liquid fuel with a calorific value greater than 8000 kcal / Nm3.

6. A mixed combustion glass melting furnace as claimed in claim 1, characterized in that: The purity of oxygen used in the high calorific value fuel combustion zone (1) is greater than 80%.

7. A mixed combustion glass melting furnace as claimed in claim 1, characterized in that: The low calorific value fuel combustion zone (2) uses fuel and high temperature air for combustion.

8. A mixed combustion glass melting furnace as claimed in claim 1, characterized in that: The fuel used in the low calorific value fuel combustion zone (2) is a gas fuel with a calorific value greater than 1300 kcal / Nm.

9. A mixed combustion glass melting furnace as claimed in claim 1, characterized in that: When the calorific value of the fuel used in the low calorific value fuel combustion zone (2) is lower than 4000 kcal / Nm, the fuel is preheated to above 1000°C before combustion.

10. A mixed combustion glass melting furnace as claimed in claim 1, characterized in that: The high temperature air in the low calorific value fuel combustion zone (2) is room temperature air heated to 1000°C or above.

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