A pure oxygen long flame fluxing lance for producing ultra-clear float glass

Abstract

The application provides a pure oxygen long flame fluxing spray gun for producing ultra-white float glass, and belongs to the technical field of float glass production equipment. The spray gun comprises a core pipe, an intermediate pipe and an outer sleeve pipe. The core pipe is located in the intermediate pipe, and the outer sleeve pipe is sleeved outside the intermediate pipe. The core pipe comprises a small-diameter section close to one end of the spray gun head and a large-diameter section away from the other end of the spray gun head. The small-diameter section and the large-diameter section are connected through a transition cone. The large-diameter section and the intermediate pipe form a small-flow combustion-supporting gas channel, the small-diameter section and the intermediate pipe form a gas mixing channel, and the outer sleeve pipe and the intermediate pipe form a large-flow combustion-supporting gas channel. The transition cone is provided with a gas outlet hole. The application has the advantages of simple structure and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of float glass production equipment, and relates to a pure oxygen long flame fluxing spray gun for producing ultra-white float glass. BACKGROUND

[0002] The float glass is prepared by using silica sand, limestone, dolomite, mirabilite and soda ash as main raw materials, mixing the raw materials into a mixture according to a certain proportion, conveying the mixture to a feeding machine by a belt, feeding the mixture into a melting furnace by the feeding machine, setting reasonable temperature, pressure, atmosphere and liquid level in the melting furnace, melting the mixture into qualified glass liquid by flame combustion, and continuously flowing the molten glass liquid into a tin bath filled with tin liquid under a protective atmosphere, so that the glass liquid floats on the surface of the tin liquid due to the density of the glass liquid being greater than that of the tin liquid, and a glass with a smooth surface and uniform thickness is formed under the action of gravity and surface tension of the glass liquid.

[0003] The main cost of the float glass is raw materials and fuel. In order to effectively reduce the cost, some ordinary float glass manufacturers currently use oxygen-enriched fluxing. The oxygen-enriched fluxing technology is a kind of high-efficiency intensified combustion technology using oxygen-enriched air with an oxygen content higher than 21% as combustion-supporting gas. The characteristics of the oxygen-enriched fluxing technology are that the volume of combustion-supporting air and combustion waste gas is reduced, the combustion reaction speed is accelerated, the flame temperature is increased, and the amount of smoke and flue gas is reduced. The use of the oxygen-enriched fluxing technology can not only improve the thermal efficiency of the melting furnace, reduce the unit heat consumption of the glass liquid, save a large amount of energy, reduce environmental pollution, but also improve the yield, quality and extend the service life of the melting furnace.

[0004] The difference between ultra-clear float glass and ordinary float glass lies in two aspects. On the one hand, due to customers' higher requirements for quality, a higher melting temperature is needed to eliminate bubble defects, resulting in energy consumption that is 8-10% higher than that of ordinary float glass. On the other hand, ultra-clear float glass is mainly used in high-end hotels, city landmark buildings, high-end exhibition halls, and other places, which have high requirements for color and need to be in a blue-white tone. Correspondingly, a strong reducing atmosphere needs to be configured in terms of process control. Oxygen-enriched melting technology creates a strongly oxidizing atmosphere in the melting furnace, which conflicts with the strong reducing atmosphere required for ultra-clear float glass. This is because when oxygen is enriched in ordinary float glass, it is piped to a regenerator. The oxygen and combustion air flow and mix in the regenerator before entering the melting furnace. In this way, the mixing of oxygen and combustion air results in a contradiction between flame length and complete combustion. Increasing the pressure of the combustion oxygen can extend the flame length to some extent, but it will also cause excess oxygen in the furnace, creating an oxidizing atmosphere. On the other hand, increasing the combustion rate will result in a shorter flame length, leading to greater temperature differences in different areas of the material, lower thermal energy utilization, and less effective bubble elimination when the material is in a low-temperature melting state, making it difficult to meet the quality requirements of ultra-clear float glass. Therefore, a longer flame is advantageous in terms of thermal utilization, higher material melting temperature, and uniform heating. It is of great significance to find a way to reduce excess oxygen in the furnace while extending the flame. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by providing a pure oxygen long-flame fluxing torch for producing ultra-white float glass. The technical problem to be solved by this invention is how to extend the flame length.

[0006] The objective of this invention can be achieved through the following technical solution: A pure oxygen long flame fluxing torch for producing ultra-white float glass, characterized in that it comprises a core tube, an intermediate tube, and an outer tube. The core tube is located inside the intermediate tube, and the outer tube is fitted outside the intermediate tube. The core tube contains a gas combustion channel. The core tube includes a small-diameter section near the torch head and a large-diameter section away from the torch head. The small-diameter section and the large-diameter section are connected by a transition cone. A small-flow-rate combustion channel is formed between the large-diameter section and the intermediate tube. A gas mixing channel is formed between the small-diameter section and the intermediate tube. A large-flow-rate combustion channel is formed between the outer tube and the intermediate tube. An outlet hole is provided on the transition cone.

[0007] Furthermore, the low-flow-rate gas-supporting channel and the high-flow-rate gas-supporting channel are connected in parallel.

[0008] Furthermore, the combustion gases in both the low-flow and high-flow combustion gas channels are mixtures with an oxygen content greater than 21%.

[0009] The logic of this scheme is as follows: a portion of the combustion-supporting gas is mixed with a portion of the combustion gas to form a highly active combustion atmosphere outside the combustion gas. That is, the mixture formed by the pre-mixing of combustion gas and combustion-supporting gas has oxygen on the periphery of this highly active combustion atmosphere and high-concentration combustion gas inside it. Since more oxygen is separated by the premixed gas, the consumption of combustion gas is slowed down. The high-concentration combustion gas in the middle can be consumed at a position far from the nozzle head due to the gradual decrease of combustion gas content in the mixture. Therefore, this method can effectively slow down the combustion gas consumption rate and extend the flame length. It can also be understood as oxygen and combustion gas contacting each other on a longer flame path, increasing the oxygen-receiving area of ​​the fuel.

[0010] In addition, the surrounding oxygen inhibits the outward expansion of the highly active combustion atmosphere, resulting in better flame beam characteristics. Under high gas pressure, the excess oxygen in the atmosphere is relatively small, which is suitable for the heating conditions of ultra-clear glass melting and the atmosphere environment after melting.

[0011] Finally, the structure is relatively simple, with only one access point for both the combustion-supporting gas and the combustion gas. There are no complex ventilation paths, ensuring reliable airflow and stable gas pressure and velocity. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the spray gun (the dashed arrows in the diagram represent the combustion path, and the solid arrows represent the combustion path).

[0013] In the diagram, 1 is the intermediate pipe; 2 is the outer casing; 3 is the small diameter section; 4 is the large diameter section; and 5 is the air outlet. Detailed Implementation

[0014] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0015] like Figure 1 The fluxing torch shown includes a core tube, an intermediate tube 1, and an outer tube 2. The core tube is located inside the intermediate tube 1, and the outer tube 2 is fitted over the intermediate tube 1. The interior of the core tube is a gas combustion passage. The core tube includes a small-diameter section 3 near the torch head and a large-diameter section 4 away from the torch head. The small-diameter section 3 and the large-diameter section 4 are connected by a transition cone. The large-diameter section 4 and the intermediate tube 1 form a low-flow-rate combustion combustion passage, the small-diameter section 3 and the intermediate tube 1 form a mixed-gas passage, and the outer tube 2 and the intermediate tube 1 form a high-flow-rate combustion combustion passage. An outlet hole 5 is provided on the transition cone. The low-flow-rate combustion combustion passage and the high-flow-rate combustion combustion passage are connected in parallel.

[0016] The combustion gases in both the low-flow and high-flow combustion gas channels are mixed gases with an oxygen content greater than 21%, i.e., oxygen-enriched combustion gases.

[0017] The logic of the scheme is: using a part of the combustion-supporting gas to mix with a part of the fuel gas, forming a high-activity combustion atmosphere outside the fuel gas, that is, the mixed gas formed by the pre-mixing of the fuel gas and the combustion-supporting gas, the oxygen is located at the periphery of the high-activity combustion atmosphere, and the high-concentration fuel gas is located inside the high-activity combustion atmosphere. Because more oxygen is separated by the premixed gas, the consumption of fuel gas is slowed down, and the high-concentration fuel gas in the middle can be consumed at a position far from the head of the lance due to the gradual reduction of the fuel gas content in the mixed gas. Therefore, this way can effectively slow down the fuel gas consumption rate and prolong the flame length. It can also be understood that the oxygen and fuel gas contact in a longer flame path, increasing the oxygen area of the fuel.

[0018] In addition, the peripheral oxygen inhibits the outward expansion of the high-activity combustion atmosphere, making the flame beam better. In the case of high fuel gas pressure, the surplus of oxygen in the atmosphere is small, which is suitable for the heating conditions and the atmosphere environment after melting of the ultra-white glass.

[0019] Finally, the structure is relatively simple, and the combustion-supporting gas and the fuel gas only have one access position, there is no complex air passage, the airflow is reliable, and the air pressure and flow rate are stable.

[0020] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A pure oxygen long-flame fluxing torch for producing ultra-white float glass, characterized in that, It includes a core tube, an intermediate tube (1) and an outer tube (2). The core tube is located inside the intermediate tube (1), and the outer tube (2) is fitted outside the intermediate tube (1). The interior of the core tube is a gas passage. The core tube includes a small diameter section (3) near the nozzle head and a large diameter section (4) away from the nozzle head. The small diameter section (3) and the large diameter section (4) are connected by a transition cone. The large diameter section (4) and the intermediate tube (1) form a small flow gas-supporting passage. The small diameter section (3) and the intermediate tube (1) form a gas-mixing passage. The outer tube (2) and the intermediate tube (1) form a large flow gas-supporting passage. The transition cone has an outlet hole (5).

2. The pure oxygen long flame fluxing lance for producing ultra-white float glass according to claim 1, characterized in that, The low-flow gas-supporting channel and the high-flow gas-supporting channel are connected in parallel.

3. The pure oxygen long flame fluxing lance for producing ultra-white float glass according to claim 1, characterized in that, The combustion gases in both the low-flow and high-flow combustion gas channels are mixtures with an oxygen content greater than 21%.

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