CN203190442U - Oxygen enrichment combustion-supporting energy-saving device of ceramic kiln - Google Patents

Abstract

The utility model discloses an oxygen-enriched combustion-supporting energy-saving device for a ceramic kiln, which belongs to the technical field of energy-saving and environmental protection of the ceramic kiln. The device includes an oxygen-enriched membrane module connected in sequence, a water ring vacuum pump, an oxygen-enriched gas buffer tank, a booster fan, and a burner; the burner includes a burner pipe body, a main air supply pipe, a fuel pipeline, and a burner nozzle , wherein: one end of the burner pipe body is closed, the other end is connected to the burner nozzle, and there are multiple burner pipe bodies; the booster fan is connected to the main air supply pipe, the fuel pipeline and the main air supply pipe The air ducts are respectively connected with each burner body; the main air supply duct is connected with the main air supply fan. According to the characteristics of the kiln atmosphere in the ceramic firing process, the utility model uses oxygen-enriched gas to replace part of the air, which can obviously reduce the heat loss of flue gas emission and at the same time save energy and reduce harmful gas emission.

Description

An oxygen-enriched combustion-supporting energy-saving device for a ceramic kiln

technical field

The utility model relates to the technical field of energy saving and environmental protection of a ceramic kiln, in particular to an oxygen-enriched combustion-supporting energy-saving device for a ceramic kiln.

Background technique

According to statistics, there are currently about 110,000 domestic industrial furnaces (excluding boilers), accounting for about 1/4 of the country's total energy consumption and 60% of the total industrial energy consumption. 90% of SO _X , 85% of CO ₂ , 80% of RO _X (dust) and 50% of NO _X pollution in China's atmosphere come from industrial boilers and kilns. Under the premise of China's energy shortage and increasing environmental pollution Promoting energy conservation and environmental protection, and developing green industries, especially promoting energy conservation and emission reduction in industrial furnaces, a high-pollution and high-energy-consuming industry, are already imminent for China and cannot be delayed.

Driven by international and domestic calls for energy conservation and emission reduction, changes in economic growth patterns, energy conservation and efficiency enhancement, and policy support, the energy conservation and environmental protection market for industrial kilns will continue to develop. At present, there are more than 15,000 various ceramic kilns in our country. Although the output of my country's ceramic industry is far ahead in the world, both thermal efficiency and thermal energy utilization rate are generally low, and the unit consumption of products is large and the cost is high. On the other hand, while the production process of ceramic kilns consumes a lot of energy, the flue gas produced by fuel combustion contains harmful gases such as CO ₂ , SO ₂ and NO _X. Therefore, energy saving and environmental protection have become the central task of ceramic kiln renovation.

Looking back at the development history of my country's ceramic industry, it is not difficult to find that the fuels of the ceramic industry include coal, fuel oil, gas, etc., and fuel accounts for a large proportion of the production cost of this industry. For a long time, enterprises have paid great attention to fuel-saving technologies and processes while improving processes, such as optimized design of kiln structure, innovation of firing technology, improvement of scientific and reasonable burners, waste heat recovery and utilization, automatic control of kiln, etc. But all this still cannot change the fact that there is a large gap in energy consumption compared with similar foreign products.

The factors that determine combustion are: fuel, temperature and oxygen. It is well known that the volume content of oxygen in air is 20.93%, nitrogen is 78.1%, and a small amount of inert gas. Regardless of the fuel combustion process of industrial boilers or industrial kilns, oxygen only accounts for about 1/5 of the total air, while nitrogen and other inert gases, which account for about 4/5 of the total air, not only do not support combustion, but will burn with the combustion. Carry out a lot of heat energy.

People call the air with an oxygen content greater than 20.93% oxygen-enriched. A large number of experiments and practices have shown that the participation of rich oxygen in combustion will have obvious energy-saving and environmental protection effects. The energy-saving mechanism of oxygen-enriched combustion-supporting technology is as follows:

(1) The combustion system using oxygen-enriched as the source of oxidant enhances the combustion of the fuel due to the oxygen-enriched combustion. Generally speaking, in an oxygen-enriched environment, the fuel burns quickly in the shortest time; the fuel can be fully released All that heat, increases the burnout rate of the fuel.

(2) The combustion system using oxygen-enriched as the oxidant source reduces the heat loss of fuel due to the oxygen-enriched environment, saving fuel;

(3) The combustion system using oxygen-enriched as the oxidant source saves energy because the oxygen-enriched environment effectively improves the heating rate of the combustion system;

(4) For the combustion system that can properly increase the process temperature, such as boilers and kilns, the oxygen-enriched environment can effectively increase the flame temperature in the furnace, effectively improve the heat transfer efficiency of the flame in the furnace, and significantly save energy.

(5) The combustion system using oxygen-enriched gas as the source of oxidant can effectively increase the flame blackness, improve heat transfer efficiency, and increase heat utilization rate due to the oxygen-enriched environment, thereby saving energy.

(6) The combustion system using oxygen-enriched as the source of oxidant can effectively reduce the excess air coefficient and the exhaust volume after combustion due to the oxygen-enriched environment, thereby reducing the exhaust heat loss and improving the thermal efficiency, thereby saving energy.

(7) The combustion system using oxygen-enriched as the oxidant source can reduce the fuel ignition temperature, increase the flame intensity and increase the heat release, etc., so as to obtain a wider range of fuel choices. Under the same conditions, lower-quality fuels or alternative fuels can be used.

However, the key technologies for combining oxygen-enriched combustion technology with ceramic kilns include: ① distribution technology of oxygen-enriched air flow; ② matching technology with combustion furnace; ③ design of special (patented) oxygen-enriched nozzles, etc. The quality of technology application is directly related to the quality of important indicators such as energy saving, production increase, service life and environmental protection of boiler equipment. The key to whether the boiler after oxygen-enriched combustion can increase the overall benefit.

Utility model content

The purpose of this utility model is to provide an oxygen-enriched combustion-supporting energy-saving device for a ceramic kiln. According to the characteristics of the kiln atmosphere in the ceramic firing process, the device uses oxygen-enriched gas to replace part of the combustion-supporting air, which can significantly reduce the heat loss of flue gas emission. At the same time, Save energy and protect the environment.

The technical scheme of the utility model is:

An oxygen-enriched combustion-supporting energy-saving device for a ceramic kiln, which includes an oxygen-enriched membrane module connected in sequence, a water ring vacuum pump, an oxygen-enriched gas buffer tank, a booster fan, and a burner; the burner includes a burner tube body, a main Air supply pipe, fuel pipeline and burner nozzle, wherein: one end of the burner pipe body is closed, and the other end is connected to the burner nozzle, and there can be multiple burner pipe bodies; the booster fan passes through the oxygen-enriched gas pipe The fuel pipeline is connected, and the fuel pipeline and the main air supply pipe are respectively connected with each burner body; the main air supply pipe is also connected with the main air supply fan.

The fuel pipeline, the main air supply pipeline and the oxygen-enriched gas pipeline are all composed of a main pipeline and a branch pipeline, and the fuel pipeline and the main air supply pipeline are respectively connected to each burner body through each branch pipeline; the booster fan is connected to The main pipeline of the oxygen-enriched gas pipeline, each branch pipeline of the oxygen-enriched gas pipeline is connected with each branch pipeline of the fuel pipeline respectively (the oxygen-enriched gas enters the fuel pipeline through each branch pipeline of the oxygen-enriched gas, and the oxygen-enriched gas pipeline in the fuel pipeline The gas and fuel gas are pre-mixed, and then enter the fuel tube body together, and the pressure of the oxygen-enriched gas in the branch pipe of the oxygen-enriched gas pipe is equal to the pressure of the fuel in the fuel line branch pipe (before pre-mixing)).

The main pipeline of the fuel pipeline is connected with a fuel flow regulating valve, the main pipeline of the main air supply pipeline is connected with the main air supply pipeline regulating valve, and the main pipeline of the oxygen-enriched gas pipeline is connected with an oxygen-enriched gas electric control valve; the main air supply fan is connected to At the initial end of the main duct of the main air supply duct. The volume ratio of the oxygen-enriched gas flow to the fuel flow is 8-15% through the fuel flow regulating valve and the oxygen-enriched gas electric regulating valve.

The oxygen-enriched gas buffer tank includes a closed tank body and a packing layer, the packing layer is arranged in the middle of the tank body, the lower part of the side wall of the tank body is provided with a gas inlet, and the upper part of the side wall is provided with a gas outlet; the diameter of the tank body is ≥ 1m, Tank height ≥ 2.5m.

The water ring vacuum pump is connected with a cooling device for cooling and heat dissipation of the water ring vacuum pump.

The heat radiation cooling device and the oxygen-enriched gas buffer tank respectively discharge waste water through pipelines, and the discharge time is controlled through valves arranged on the pipelines.

The working principle of the oxygen-enriched combustion-supporting energy-saving device for the ceramic kiln of the utility model is as follows:

Oxygen-enriched membrane module (membrane stack): According to the technical project, the membrane module is stacked in the plane position of the site, which can be arranged in a plane or stacked upwards.

Water ring vacuum pump: adopts vacuum extraction method to enrich the oxygen-enriched gas in the membrane stack and send it to the oxygen-enriched gas buffer tank.

Oxygen-enriched gas buffer tank: While the oxygen-enriched gas is enriched by the water ring vacuum pump, the water content of the oxygen-enriched gas is very high. , the speed of the oxygen-enriched gas decreases. In addition, the oxygen-enriched gas will remove the water in the oxygen-enriched gas after passing through the packing layer. The dehydrated oxygen-enriched gas enters the booster fan from the gas outlet of the tank, and the separated water is discharged from the tank. The bottom pipe is discharged (the bottom of the tank is provided with a discharge port, and the discharge port is connected to a pipe for drainage).

Booster fan: The pressure of the oxygen-enriched gas from the oxygen-enriched gas buffer tank is relatively low and cannot overcome the resistance in the subsequent process. Therefore, after boosting by the booster fan, the pressure of the oxygen-enriched gas (the pressure of the oxygen-enriched gas is the same as that of the fuel gas) The pressure is the same) so that the fuel gas can be pre-mixed in the fuel pipeline before the fuel gas enters the burner tube.

The ceramic kiln can be an industrial kiln such as a tunnel kiln, a roller kiln or a shuttle kiln.

Advantage of the utility model and beneficial effect are as follows:

1. The device of this utility model makes the oxygen-enriched gas enriched and pressurized (the pressure of the oxygen-enriched gas is the same as that of the fuel (natural gas)), and then sent to the front section of the burner tube (that is, near the front end of the burner tube) and then It merges with the fuel pipeline to maximize the use of oxygen-enriched gas to achieve the purpose of energy saving and environmental protection.

2. The oxygen-enriched pipeline and the main air supply pipeline in the device of the present utility model are respectively equipped with opening and closing regulating valves, which can be opened and closed under the conditions of different process atmospheres and process time requirements, and finally realize oxygen enrichment for energy saving and process satisfaction. the purpose of the request.

3. The membrane stack in the device of the utility model can be stacked and placed according to the building block type according to the actual equipment land area on site.

4. In the prior art, the oxygen-enriched gas produced by the water ring vacuum pump passes through the steam-water separation device and the gas buffer device for steam-water separation and gas buffering respectively. The oxygen-enriched gas buffer tank designed by the utility model simultaneously realizes the oxygen-enriched The gas-water separation and buffering function of the gas, that is: the gas from the water ring vacuum pump contains a certain amount of water. After this part of the gas enters the oxygen-enriched gas buffer tank, the flow rate is reduced and the moisture in the gas is also removed. Compared with the prior art, the design not only saves the occupied area, but also saves the equipment cost.

5. In the device of the utility model, the oxygen-enriched gas is premixed with the fuel before entering the burner tube. This gas feeding method is suitable for tunnel kiln, roller kiln, shuttle kiln and other industrial kilns.

6. According to the characteristics of the kiln atmosphere in the ceramic firing process, the utility model uses oxygen-rich gas to replace part of the air, which can obviously reduce the heat loss of flue gas emission and save energy. The utility model uses the oxygen-enriched combustion technology to achieve comprehensive energy saving of more than 10%.

7. This utility model proposes the use of oxygen-enriched combustion-supporting membrane technology as a kiln energy-saving technology, which is specially used for energy-saving transformation in the fields of ceramic kilns. While using the oxygen-enriched combustion air supply technology, the furnace can be optimized by improving the structure of the burner Kiln combustion system, by controlling the flow ratio of combustion-supporting gas and fuel (the volume ratio of oxygen-enriched gas flow to fuel flow is 8-15%), while keeping the original sintering process curve unchanged, the temperature distribution in the ceramic kiln is improved at the same time Uniformity, reducing the total fuel consumption, while reducing the total emissions of CO and nitrogen oxides in the tail flue gas. This technology not only solves the problem of energy saving and consumption reduction, but more importantly, through the implementation of oxygen-enriched energy-saving technology transformation, it also improves the process level and product quality of ceramics and other industrial kiln products.

Description of drawings

Fig. 1 is a schematic structural diagram of an oxygen-enriched combustion-supporting energy-saving device for a ceramic kiln of the present invention.

Fig. 2 is a schematic structural view of a burner in an oxygen-enriched combustion-supporting energy-saving device for a ceramic kiln of the present invention.

Fig. 3 is a three-dimensional structural schematic diagram of a burner tube of the burner in the present invention.

Fig. 4 is a structural schematic diagram of an oxygen-enriched gas buffer tank in the present invention.

Among them: 1-oxygen-enriched membrane module; 2-water ring vacuum pump; 3-oxygen-enriched gas buffer tank; 31-tank body; 32-packing layer; 33-gas outlet; 34-gas inlet; 4-boosting fan; 5 -ceramic kiln; 6-main air supply fan; 7-burner; 71-oxygen-enriched gas pipeline; 72-main air supply pipeline; 73-fuel pipeline; 8-burner pipe body; Adjusting valve; 82- electric control valve of main air supply pipe; 83- burner nozzle; 9- trench; 10- pipeline pump; 11- valve; 12- cooling device;

Detailed ways

Describe the utility model in detail below in conjunction with accompanying drawing.

As shown in Figures 1-4, the utility model ceramic kiln oxygen-enriched combustion-supporting energy-saving device includes an oxygen-enriched membrane module 1, a water ring vacuum pump 2, an oxygen-enriched gas buffer tank 3, a booster fan 4 and a burner 7 connected in sequence; The burner 7 includes a burner pipe body 8, a main air supply duct 72, a fuel pipeline 73 and a burner nozzle 83, wherein: one end of the burner pipe body 8 is closed, and the other end is connected to the burner nozzle 83 to burn There can be a plurality of device pipe bodies 83, and the fuel pipeline 73 and the main air supply pipeline 72 are respectively connected with each burner pipe body 83; The air duct 72 is connected to the main blower fan 6 .

The fuel pipeline 73, the main air supply pipeline 72 and the oxygen-enriched gas pipeline 71 are all composed of a main pipeline and a branch pipeline, and the fuel pipeline 73 and the main air supply pipeline 72 are respectively connected to each burner pipe body through each branch pipeline 8. The booster fan 4 is connected to the main pipeline of the oxygen-enriched gas pipeline 71, and then connected to each branch pipeline of the fuel pipeline 73 through each branch pipeline of the oxygen-enriched gas pipeline 71, so as to maximize the use effect of the oxygen-enriched gas.

The main pipe of the fuel pipeline 73 is connected with a fuel flow regulating valve for adjusting the flow of fuel (gas or fuel oil), and the main pipe of the main air supply pipe 72 is connected with an electric control valve 82 of the main air supply pipe for adjusting the air supply. Flow rate; its main pipeline of oxygen-enriched gas pipeline 71 is connected with oxygen-enriched gas electric control valve 81, which can open and close and regulate the flow of oxygen-enriched gas; main blower fan 6 is connected to the initial end of its main pipeline of main air supply pipeline 72.

The oxygen-enriched gas buffer tank 3 includes a closed tank body 31 and a packing layer 32, the packing layer 32 is arranged in the middle of the tank body 31, a gas inlet 34 is arranged at the lower part of the side wall of the tank body 31, and a gas outlet 33 is arranged at the upper part of the side wall; The diameter of the tank body 31 is ≥ 1m, and the height of the tank body 31 is ≥ 2.5m.

The water ring vacuum pump 2 is connected with a cooling device 12 for cooling and heat dissipation of the water ring vacuum pump.

The heat dissipation cooling device 12 discharges waste water into the trench 9 through a pipeline equipped with a valve 11, and the steam-water separation and oxygen-enriched gas buffer tank 3 discharges waste water into the trench 9 through a pipeline equipped with a valve 11 and a pipeline pump 10. The valve 11 can be opened regularly to discharge waste water.

Example 1

A 1.5m ³ ceramic shuttle kiln, designed with a total power rating of 300,000 kcal, divided into two burners. After the air flows through the oxygen-enriched membrane module, it is extracted by the water ring vacuum pump to form an oxygen-enriched oxygen with an oxygen concentration of 25-30% (volume content). The average gas flow rate is 28-35m ³ /h, the inner diameter of the gas burner gas supply pipeline is 24mm, and the inner diameter of the co-combustion oxygen-rich gas supply pipeline is 8mm. Under the condition that the gas supply pressure and the oxygen-enriched gas supply pressure are equal, and the original sintering process curve is kept unchanged, the comprehensive energy saving of more than 10% will be finally realized.

Example 2

A 48-meter-long ceramic tunnel kiln is designed with a total rated power of 2 million kcal and equipped with 40 burners in total. Among them, an oxygen-enriched combustion-supporting process was added to 10 pipelines equipped with 60,000 kcal burners. After the air flows through the oxygen-enriched membrane module, it is extracted by the water ring vacuum pump to form an oxygen-enriched oxygen with an oxygen concentration of 25-30% (volume content). Among them, the inner diameter of the gas supply pipeline is 35mm, and the inner diameter of the mixed-combustion oxygen-enriched gas supply pipeline is 12mm; under the condition that the gas supply pressure and the oxygen-enriched gas supply pressure are equal, and the original sintering process curve remains unchanged, the final Achieve comprehensive energy saving of more than 8%.

Claims (8)

1. An oxygen-enriched combustion-supporting energy-saving device for a ceramic kiln, characterized in that: the device includes an oxygen-enriched membrane module, a water ring vacuum pump, an oxygen-enriched gas buffer tank, a booster fan and a burner; the burner includes Burner pipe body, main air supply pipe, fuel pipeline and burner nozzle, wherein: one end of the burner pipe body is closed, the other end is connected to the burner nozzle, and there are multiple burner pipe bodies; the booster fan The main air supply pipeline is connected through the oxygen-enriched gas pipeline, and the fuel pipeline and the main air supply pipeline are respectively connected with each burner body; the main air supply pipeline is connected with the main air supply fan. 2. The oxygen-enriched combustion-supporting energy-saving device for a ceramic kiln according to claim 1, characterized in that: the fuel pipeline, the main air supply pipeline and the oxygen-enriched gas pipeline are all composed of a main pipeline and branch pipelines, and the fuel pipeline The main air supply pipe and the main air supply pipe are connected to each burner pipe through each branch pipe; the booster fan is connected to the main pipe of the oxygen-enriched gas pipe, and each branch pipe of the oxygen-enriched gas pipe is connected to each branch pipe of the fuel pipeline respectively. 3. The oxygen-enriched combustion-supporting energy-saving device for a ceramic kiln according to claim 2, characterized in that: the main pipe of the fuel pipeline is connected with a fuel flow regulating valve, and the main pipe of the main air supply pipeline is connected with a main air supply pipeline electrical outlet. The regulating valve, the oxygen-enriched gas pipeline is connected to the oxygen-enriched gas electrical control valve on its main pipeline; the main air supply fan is connected to the initial end of the main air supply pipeline. 4. The oxygen-enriched combustion-supporting energy-saving device for a ceramic kiln according to claim 1, characterized in that: the oxygen-enriched gas buffer tank includes a closed tank body and a packing layer, the packing layer is arranged in the middle of the tank body, and the tank body A gas inlet is arranged at the lower part of the side wall, and a gas outlet is arranged at the upper part of the side wall. 5. The oxygen-enriched combustion-supporting energy-saving device for a ceramic kiln according to claim 4, characterized in that: the diameter of the tank body is ≥ 1 m, and the height of the tank body is ≥ 2.5 m. 6. The oxygen-enriched combustion-supporting energy-saving device for a ceramic kiln according to claim 1, wherein the water ring vacuum pump is connected with a cooling device for cooling and heat dissipation of the water ring vacuum pump. 7. The oxygen-enriched combustion-supporting energy-saving device for ceramic kilns according to claim 6, characterized in that: the heat radiation cooling device and the oxygen-enriched gas buffer tank respectively discharge waste water through pipelines, and the discharge time is controlled by valves set on the pipelines . 8. The oxygen-enriched combustion-supporting energy-saving device for ceramic kilns according to claim 1, characterized in that the device is suitable for tunnel kilns, roller kilns, shuttle kilns or industrial kilns.

Images