A water bucket shutter for a full oxygen kiln flue
By using water-cooled gate valves in the flue gas ducts of an oxygen-filled kiln, the temperature of the gate valves is reduced by using cooling water, thus solving the problem of corrosion of the gate valves by high-temperature flue gas and achieving a reduction in the durability of the gate valves and energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GANSU KAISHENG DAMING LIGHT ENERGY TECH CO LTD
- Filing Date
- 2025-06-24
- Publication Date
- 2026-06-12
AI Technical Summary
The high-temperature flue gas caused by the all-oxygen combustion technology damages the damper plate of the branch flue, making it difficult to withstand the erosion of high temperatures of over 1,000 degrees Celsius. This leads to damper plate burnout, uncontrolled temperature inside the kiln, turbulent flue gas flow, increased fuel consumption, and persistently high energy consumption.
Design a water-cooled gate valve. By circulating cooling water through the straight pipe and U-shaped pipe of the sealing unit, the gate valve temperature is reduced, the structural rigidity is enhanced, and burn-out and temperature runaway are prevented.
It extends the service life of the gate, stabilizes the temperature inside the kiln, controls the flue gas flow, reduces fuel consumption, and lowers energy consumption and production costs.
Smart Images
Figure CN224353609U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of damper plates for the branch flue of an oxygen-fired kiln, specifically a water-filled damper plate for the branch flue of an oxygen-fired kiln. Background Technology
[0002] In glass melting furnace flue systems employing oxy-fuel combustion technology, the oxygen furnace branch flue is an indispensable and crucial structural component. Like the "breathing artery" of the melting furnace, it connects at one end to the exhaust gas inlet of specific areas such as the melting section, refining section, or heat exchanger outlet, and at the other end to the main flue or collection flue, undertaking the important tasks of collecting, guiding, and regulating the flow of high-temperature exhaust gas.
[0003] Compared to traditional air-assisted combustion furnaces, oxy-fuel combustion technology uses high-purity oxygen (>90%) instead of air as the combustion agent, bringing significant advantages to glass production. On the one hand, exhaust emissions are reduced by 70-80%, and nitrogen oxide emissions are significantly lowered; on the other hand, it also gives rise to a series of technical challenges. The flue gas temperature produced by oxy-fuel combustion soars to 1400-1600°C or even higher, and the flue gas composition is fundamentally changed. High concentrations of carbon dioxide and water vapor become the main components, along with highly volatile alkali metal vapors (such as NaO, etc.). The high temperature, high alkali, and strong corrosive environment presents stringent challenges to the design, material selection, and operation and maintenance management of the flue gas ducts.
[0004] In actual operation, high-temperature flue gas is the first to damage the dampers in the branch flue. Damperes made of ordinary materials cannot withstand the continuous erosion of temperatures exceeding 1,000 degrees Celsius and are prone to burning. After the dampers are damaged, the temperature inside the kiln becomes uncontrolled, the flue gas flow becomes turbulent and disordered, and this leads to an abnormal rise in the temperature of the main flue. At the same time, the flue gas flow in the upstream and downstream flues also loses effective control. In order to maintain the production process, fuel consumption is forced to increase, ultimately resulting in a situation of persistently high energy consumption. Utility Model Content
[0005] This utility model provides a water-filled gate for the flue gas duct of an oxygen-filled kiln, which solves the problems mentioned in the background art.
[0006] To address the existing problems, this utility model provides a water-cooled gate for the flue gas duct of an oxygen-fired kiln, comprising two lifting plates, with a gate fixedly connected between the lifting plates. The gate is composed of several parallel sealing units, each of which includes two parallel straight pipes and two U-shaped pipes connecting the two straight pipes. The two U-shaped pipes are interconnected, and the upper end of each straight pipe is provided with a nozzle for connecting to an external cooling water circulation system.
[0007] Furthermore, a through groove is provided in the middle of the U-shaped tube, and reinforcing blocks are fixedly connected in the through groove and in the gap between the U-shaped tube and the straight tubes on both sides to enhance the structural rigidity of the gate.
[0008] Furthermore, the top of the lifting plate is provided with lifting holes.
[0009] Furthermore, the inner cavities of the straight pipe and the U-shaped pipe are connected to form a cooling water flow channel.
[0010] Compared with the prior art, the beneficial effects of this utility model are:
[0011] 1. This application proposes a water-cooled gate valve for the branch flue of an oxygen-fired kiln. By setting up a sealing unit, circulating cooling water is introduced into the cavity of the straight pipe and U-shaped pipe of the sealing unit, carrying away the heat transferred from the branch flue to the gate valve, reducing the operating temperature of the gate valve, making it less prone to burn-out, and extending the service life of the gate valve. Secondly, because the gate valve is less prone to burn-out, it will not cause problems such as uncontrolled temperature in the kiln and disordered flue gas flow leading to abnormally high temperatures in the main flue. At the same time, it also controls the flue gas flow in the upstream and downstream flues, reducing fuel consumption and lowering energy consumption and production costs. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of a water-cooled gate plate used in the flue of an oxygen-filled kiln.
[0013] Figure 2 This is a schematic diagram of the sealing unit structure of a water-filled gate for a branch flue of an oxygen-filled kiln;
[0014] Figure 3 This is a schematic diagram showing the disassembled straight pipe and U-shaped pipe of a water-jacketed gate for a branch flue of an oxygen-filled kiln;
[0015] Figure 4 This is a graph showing the change in furnace heat consumption over time after the use of a water-cooled gate valve for the flue gas duct of an all-oxygen kiln.
[0016] Figure 5 This is a graph showing the change in overall production cost and energy consumption over time after the use of a water-cooled gate valve for the flue gas duct of an all-oxygen kiln.
[0017] Figure 6 This is a graph showing the change in gas consumption over time after the use of a water-cooled gate valve for the flue gas duct of an all-oxygen kiln.
[0018] Figure 7 This is a curve showing the change in fuel consumption per unit area over time after the use of a water-cooled gate valve for the flue gas duct of an all-oxygen kiln.
[0019] In the diagram: 1. Lifting plate; 101. Lifting hole; 2. Gate; 3. Sealing unit; 301. Straight pipe; 302. U-shaped pipe; 303. Nozzle; 3021. Through groove; 4. Reinforcing block. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Please see Figure 1-7 A water-cooled gate for the flue gas duct of an oxygen-filled kiln includes two lifting plates 1, with a gate 2 fixedly connected between the lifting plates 1. The gate 2 is composed of several parallel sealing units 3. Each sealing unit 3 includes two parallel straight pipes 301 and two U-shaped pipes 302 connecting the two straight pipes 301. The two U-shaped pipes 302 are interconnected. The upper end of the straight pipes 301 is provided with a nozzle 303 for connecting to an external cooling water circulation system.
[0022] It should be noted that: the two U-shaped tubes 302 of the sealing unit 3 are made of metal and are fixed by welding; the two straight tubes 301 are also made of metal, and the straight tubes 301 and U-shaped tubes 302 are also fixed by welding.
[0023] The U-shaped tube 302 has a through groove 3021 in the middle. Reinforcing blocks 4 are fixedly connected in the through groove 3021 and in the gap between the U-shaped tube 302 and the straight tubes 301 on both sides to enhance the structural rigidity of the gate plate 2.
[0024] The top of the lifting plate 1 is provided with a lifting hole 101.
[0025] The inner cavities of the straight pipe 301 and the U-shaped pipe 302 are connected to form a cooling water flow channel.
[0026] Working Principle: During operation, the operator uses a gantry crane or other lifting equipment to install the gate plate 2 at a predetermined position in the flue gas duct of the all-oxygen kiln using the lifting hole 101 on the top of the lifting plate 1. Then, cooling water is injected into the sealing unit 3 through a nozzle 303 connected to the inlet pipe of the cooling water circulation system. The injected cooling water first enters a straight pipe 301 connected to the inlet pipe, then flows through two interconnected U-shaped pipes 302 before entering another straight pipe 301, and finally returns to the cooling water circulation system from the nozzle 303 of that straight pipe.
[0027] During this cycle, cooling water continuously flows through the cooling water channel formed by the inner cavity of the straight pipe 301 and the U-shaped pipe 302, efficiently absorbing the heat transferred to the gate 2 by the branch flue, which can significantly reduce the temperature of the gate 2 and effectively prevent it from deforming, burning or structural failure in the high-temperature flue gas environment, thereby ensuring the reliable operation of the gate under extreme working conditions.
[0028] Traditional steel gate valves are prone to burning out at high temperatures. After the branch flue gate valves burn out, frequent replacements are necessary, making it difficult to stabilize the kiln temperature and causing the main flue temperature to rise. Furthermore, after the branch flue gate valves burn out, it becomes difficult to control the flue gas flow in the preceding and following flues, leading to increased fuel consumption, high energy consumption, and high production costs. This application proposes a water-cooled gate valve for the branch flue of an oxygen-fired kiln. Circulating cooling water is introduced into the cavity between the straight pipe 301 and the U-shaped pipe 302, carrying away the heat transferred from the branch flue to the gate valve 2, reducing the operating temperature of the gate valve 2, and extending its service life. Because the gate valve 2 is less prone to burning out, it avoids the problem of uncontrolled kiln temperature and disordered flue gas flow that could lead to abnormally high main flue temperatures. Simultaneously, it controls the flue gas flow in the preceding and following flues, reducing fuel consumption and lowering energy consumption and production costs.
[0029] Secondly, refer to Figures 3 to 7 From March 25, 2020 to March 25, 2025, the use of the water-filled gate valve for the branch flue of the all-oxygen kiln proposed in this application resulted in a reduction of natural gas consumption by 13,968 m³, a reduction of fuel consumption per unit volume by 3.7 kgce / heavy box, a reduction of furnace heat consumption by 120 kJ / kg molten glass, and a reduction of overall energy consumption in production costs by 5.7 kg / heavy box.
[0030] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or equivalent variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.
Claims
1. A water-cooled gate for the flue gas duct of an oxygen-fired kiln, comprising two lifting plates (1), characterized in that: A gate (2) is fixedly connected between the lifting plates (1). The gate (2) is composed of several blocking units (3) connected in parallel. Each blocking unit (3) includes two parallel straight pipes (301) and two U-shaped pipes (302) connecting the two straight pipes (301). The two U-shaped pipes (302) are connected to each other, and the upper end of the straight pipe (301) is provided with a nozzle (303) for connecting to an external cooling water circulation system.
2. A water-cooled gate for a flue gas duct in an oxygen-rich kiln according to claim 1, characterized in that: The U-shaped tube (302) has a through groove (3021) in the middle. Reinforcing blocks (4) are fixedly connected in the through groove (3021) and in the gap between the U-shaped tube (302) and the straight tubes (301) on both sides, to enhance the structural rigidity of the gate (2).
3. A water-cooled gate for a flue gas duct in an oxygen-rich kiln according to claim 1, characterized in that: The top of the lifting plate (1) is provided with a lifting hole (101).
4. A water-cooled gate for a flue gas duct in an oxygen-rich kiln according to claim 1, characterized in that: The inner cavities of the straight pipe (301) and the U-shaped pipe (302) are connected to form a cooling water flow channel.