CN218403999U - Device for co-producing active lime by natural gas and biomass fuel - Google Patents

Abstract

This application discloses a device for co-producing active lime with natural gas and biomass fuel to solve the problem that the single-chamber shaft furnace in the prior art cannot use high-calorific-value gas and low-calorific-value gas for mixed combustion and cannot inject solid powder when producing lime. fuel problem. This application realizes the use of natural gas fuel, biomass gas fuel and biomass powder fuel in the same furnace through the combined application of the central combustion device inside the furnace and the external combustion device outside the furnace. The purpose of burning active lime is not only simple and practical, compact structure, short calcination time, high production efficiency, high output, good product quality, good economy and low production cost; but also realizes the replacement of mineral fuel by clean energy and the reduction of biomass The purpose of deep-level utilization of fuel; at the same time, it greatly reduces the emission of pollutants and carbon dioxide, which is of great significance in reducing pollution and reducing carbon, improving the ecological environment, and ensuring national energy security.

Description

A device for co-producing active lime with natural gas and biomass fuel

technical field

The application relates to the technical field of lime production by lime kilns, in particular to a device for co-producing active lime with natural gas and biomass fuel.

Background technique

The traditional lime firing in our country uses coal, coke and other solid fuels. At present, about 80% of our country's lime production capacity is still produced by coal and other solid fuels. Entering the "14th Five-Year Plan" period, my country's ecological environment protection has entered a new stage of coordinated pollution reduction and carbon reduction. Under the background of my country's "double carbon", the process of using coal to produce lime has been strictly restricted and prohibited, especially the use of solid Coal-fueled mixing shaft kilns are no longer allowed to be built. Moreover, the important thing is that from the current coal price in our country, there is no cost advantage in using coal to produce lime. Therefore, how to choose the energy structure of lime production enterprises has been the key to the survival and development of enterprises.

From the current fuel structure analysis of lime production and from the perspective of national industrial policy and industry development prospects, the use of natural gas to produce lime will be the first choice. As the main energy source in the future, natural gas has many advantages that other energy sources do not have: natural gas is the cleanest fuel, and it generates carbon dioxide and water after combustion. Compared with coal and heavy oil, the harmful substances produced by burning natural gas are greatly reduced, such as Natural gas instead of coal can reduce nitrogen oxide emissions by 80%-90%, carbon monoxide emissions by 52%, and basically eliminate sulfur dioxide emissions and urban acid rain. Natural gas is also safe. It will not produce toxic gases such as carbon monoxide during combustion, and will not endanger human health. The density is lighter than air. Even if it leaks, it will float upwards and is not easy to form an explosion source.

However, due to the limitation of my country's energy structure, the price of natural gas in most areas of my country is very expensive. From the perspective of its production cost, the production cost of natural gas is far higher than the cost of coal production of lime, which makes it impossible to use natural gas directly or completely. Lime production. At present, the price of natural gas is relatively low in only a few areas such as Xinjiang, Sichuan, and Shaanxi, and its production cost is close to the cost of coal production of lime. However, due to the limitations of traditional lime production process equipment and natural gas combustion characteristics, most of the traditional shaft kilns cannot use natural gas. Lime production. Therefore, on the premise that natural gas is preferred as the fuel for lime production, how to choose new available energy and alternative energy to produce lime is an urgent problem to be solved. practitioners' expectations.

Biomass is known as the fourth largest energy source in the world. For the utilization of biomass, people tend to gasify it to obtain biomass gas. Worldwide, biomass gasification is mainly used for heating/kiln, combined heat and power (CHP), co-combustion applications and synthetic fuels, and the largest application currently is CHP. Since the 1980s , Biomass gasification is used in cement kilns and lime kilns in the paper industry in the United States, Sweden, Finland and other countries. It can not only ensure the supply of raw materials but also meet the needs of the industry, and has strong competitiveness. In the 1990s, biomass gasification began to be applied to cogeneration of heat and power, multi-purpose diesel or gas internal combustion engines, and biomass integrated gasification combined cycle (biomass integrated gasification combined cycle, BIGCC) has also become a research hotspot, in Sweden, the United States, Brazil, etc. China has built several demonstration projects. In 1998, biomass gasification mixed combustion technology has been used in coal power plants to transport biomass gas to boilers for co-combustion with coal, and it is now in commercial operation.

Biomass gasification in China is mainly used for power generation/CHP, heat supply/kiln and centralized gas supply. Gasification power generation devices with different specifications from 200kWe to 20MWe have been built. Gasification power generation is developing in the direction of industrial scale. One of the countries with the most applications of small and medium-sized biomass gasification power generation in the world.

There are four forms of thermochemical energy conversion: combustion, pyrolysis, gasification and liquefaction. As an efficient and clean method of use, biomass gasification plays an important role in improving biomass utilization and reducing pollution. It is the most important form of biomass thermochemical energy conversion. The utilization rate of biomass after gasification It is 3 to 5 times that of direct combustion. Compared with coal, biomass has better reactivity, high volatile content, high H/C and O/C ratio, low ash content, large porosity and large pore size. These properties make biomass an ideal feedstock for gasification.

In biomass fuel, the calorific value of different straws is 3000-3800 kcal/kg, and the calorific value of different wood chips is 4200-4500 kcal/kg. Although the calorific value per unit mass of the above two fuels is obviously lower than that of pulverized coal, natural gas and other fuels, the temperature of industrial lime production is much lower than that of cement production, sintering and other reactions, generally at 950-1250 °C, so It is feasible to use straw powder and sawdust powder as fuel to prepare lime.

At present, when coal, coke and other solid fuels are used for lime burning, the safety is low, and the content of toxic gases such as carbon monoxide produced by combustion is high, which will endanger human health. In severe cases, toxic gases leak and easily form sources of explosion and pollution. Moreover, there is no technology and case for using biomass gas and biomass solid powder fuel to produce lime, especially the technology and equipment for producing lime in a single-chamber shaft kiln cannot use high calorific value gas such as natural gas and low calorific value gas such as biomass gas. Mixed combustion production, especially the traditional peripheral burner gas shaft kiln, due to the short combustion flame of natural gas and biomass gas, when the diameter of the kiln body is too large, the heat energy cannot reach the center of the furnace, resulting in low output and high lime burning rate . At the same time, it has the disadvantages of long calcination time, high energy consumption and high investment cost.

Contents of the invention

For this reason, the application provides a device for co-producing active lime with natural gas and biomass fuel to solve the problem that the single-chamber shaft furnace in the prior art cannot use high-calorific-value gas and low-calorific-value gas for mixed combustion and cannot inject solids when producing lime. Powdered fuel, and the problems of low safety, long calcination time, low output and high energy consumption.

In order to achieve the above object, the application provides the following technical solutions:

In the first aspect, a device for co-producing active lime with natural gas and biomass fuel, including:

The furnace body roasting system of the shaft furnace includes a furnace body, a central combustion device in the furnace and an external combustion device. The central combustion device in the furnace provides heat energy for the central part of the furnace body, and the external combustion device is the The external space of the body provides heat energy; the stone material supply system includes a stone silo and a loading trolley, and the end of the loading trolley is provided with a discharge port. After the stone in the stone silo enters the loading trolley, it enters through the discharge port In the furnace body; an air supply system, which provides combustion-supporting air for the central combustion device in the furnace and the external combustion device; a fuel supply system, which includes a natural gas heating device and a biomass gas heating device; A system for unloading the lime that has been calcined and cooled by the shaft furnace body roasting system;

The outer wall of the furnace body is provided with gas fuel surrounding pipes, and the gas fuel surrounding pipes include natural gas fuel surrounding pipes and biomass gas fuel surrounding pipes; the natural gas heating device is connected to the natural gas fuel surrounding pipes through pipelines, and The natural gas fuel surrounding pipe has several natural gas fuel surrounding pipe branch pipes, and the natural gas fuel surrounding pipe branch pipes communicate with the furnace central combustion device and the furnace external combustion device; the biomass gas heating device communicates with the biomass gas heating device through pipes The material gas fuel surrounding pipe is connected, and the biomass gas fuel surrounding pipe has several biomass gas fuel surrounding pipe branch pipes, and the several biomass gas fuel surrounding pipe branch pipes communicate with the central combustion device in the furnace and the external combustion device.

Optionally, the stone supply system also includes a stone weighing device, an electric belt conveyor and a hoist, the stone weighing device is arranged below the stone silo, and the stone in the stone silo is weighed by the stone. After the device is weighed, it is transported to the loading trolley through the electric belt conveyor, and the stones on the loading trolley are lifted to the furnace body by a winch.

Optionally, it also includes a multifunctional distributor, which is arranged on the top of the furnace body; the multifunctional distributor is a screening tilting rotary distributor, and the stone is screened and tilted by the rotary distributor Then enter the furnace body.

Optionally, the inner space of the furnace body is divided into three zones from top to bottom: a preheating zone, a calcination zone and a cooling zone; the outer wall of the furnace body is provided with a first-stage furnace air seat, The secondary furnace air seat, the secondary furnace air seat is located at the lower part of the primary furnace air seat;

The central combustion device in the furnace is located at the lower part of the calcination zone, and the top of the central combustion device in the furnace is provided with a first nozzle and a second nozzle, and the first nozzle is used to inject natural gas or biomass gas. The second nozzle is used for spraying biomass powder; the bottom of the central combustion device in the furnace is provided with a first pipeline, and the first pipeline communicates with the first-stage furnace air seat, and the first pipeline is connected to the central combustion chamber in the furnace. The device plays a supporting role and provides a channel for the primary combustion air;

The combustion device outside the furnace is located on the outer wall of the furnace body and corresponds to the upper part of the calcination zone. The combustion device outside the furnace includes a long-flame burner and a short-flame burner, and the long-flame burner is located on the top of the short-flame burner; The outer wall of the furnace body corresponds to the upper area of the calcination zone and is provided with a combustion-supporting air surrounding pipe and a gas fuel surrounding pipe sequentially from top to bottom; the combustion-supporting air surrounding pipe is located at the lower part of the short-flame burner.

Optionally, the air supply system includes a primary combustion-supporting fan, a secondary combustion-supporting fan and a combustion-supporting wind cap; the combustion-supporting wind cap is located below the central combustion device in the furnace;

The primary combustion-supporting fan is connected to the first-stage furnace air seat through a primary combustion-supporting fan pipe, and the outer wall of the first-stage furnace air seat communicates with the combustion-supporting air surrounding pipe through the second pipe, and the combustion-supporting air surrounding pipe passes through the The first branch pipe and the second branch pipe are connected with the long-flame burner and the short-flame burner to provide primary combustion-supporting air for the long-flame burner and the short-flame burner;

The secondary combustion-supporting fan is connected to the secondary combustion-supporting fan seat through the secondary combustion-supporting fan pipe, and the secondary combustion-supporting fan seat is connected to the combustion-supporting air cap through the third pipe, which is the central combustion device in the furnace, the furnace The external combustion device provides secondary combustion air.

Optionally, the natural gas heating device includes a natural gas source, a natural gas supply pressure regulating device and a natural gas heating pipeline, the natural gas source enters the natural gas heating pipeline after passing through the natural gas supply pressure regulating device, the The natural gas heating pipeline is connected with the natural gas fuel surrounding pipe; the natural gas fuel surrounding pipe is respectively connected to the long flame burner, short flame burner, furnace through the third branch pipe, the fourth branch pipe, and the fifth branch pipe. The inner center combustion device is connected; the natural gas heating pipeline is sequentially provided with a first flow meter, a first pressure gauge, a first valve, and a first safety device.

The biomass gas heating device includes a biomass gas source, a biomass gas supply device, a biomass gas pressurization device, and a biomass gas heating pipeline, and the biomass gas source passes through the biomass gas successively. After the gas supply device and the biomass gas pressurization device enter the biomass gas heating pipeline, the biomass gas heating pipeline is connected with the biomass gas fuel surrounding pipe; the biomass gas fuel surrounding pipe respectively passes through the second The six branch pipes, the seventh branch pipe, and the eighth branch pipe are connected to the long flame burner, short flame burner, and central combustion device in the furnace; the biomass gas heating pipe is sequentially provided with a second flow meter, The second pressure gauge, the second valve, and the second safety device.

Optionally, it also includes a biomass solid powder heating device; the biomass solid powder heating device includes a biomass powder, a biomass powder heating device and a biomass powder heating pipeline; the biomass The material powder enters the biomass powder heating pipeline through the biomass powder heating device, and the biomass powder heating pipeline runs through the outer wall of the furnace body and is connected with the central combustion device in the furnace; the biomass powder A third flowmeter, a third pressure gauge, a third valve, and a third safety device are sequentially arranged on the material heating pipeline.

Optionally, the upper part of the furnace preheating zone is provided with a carbon dioxide gas recovery device and a carbon dioxide circulation flame-retardant fan, and the carbon dioxide gas recovery device is connected to the carbon dioxide gas internal circulation pipe network, and the carbon dioxide gas internal circulation pipe network passes through the carbon dioxide gas The circulation flame-retardant fan is connected to the long-flame burner and the short-flame burner through the ninth branch pipe and the tenth branch pipe respectively.

Optionally, the discharge system includes a distribution bin, a distribution bin chute, a central lower bin and a rotary ash discharge device, and the distribution bin chute and the central lower feed bin are located In the upper part, the central lower hopper and a plurality of distribution bins are arranged at the bottom of the furnace, and are evenly distributed along the periphery of the kiln wall. The center material descending pipe descends to the top of the rotary ash discharge device, and the calcium oxide is discharged into multiple weighing devices in the furnace through rotation, and the weighed calcium oxide is discharged into the ash discharge hopper through the discharge valve, and is sealed by the The ash discharge machine discharges the calcium oxide out of the furnace.

In the second aspect, a process for co-producing active lime with natural gas and biomass fuel includes the above-mentioned device for co-producing active lime with natural gas and biomass fuel. The steps of heating mode of heat production are as follows:

S1. After the stone in the stone bin enters the feeding trolley, it enters the furnace body through the discharge port;

S2. While the stone material is transported to the inside of the furnace body, the natural gas heating device enters the natural gas fuel surrounding pipe through the pipeline, and provides the combustion device outside the furnace through the branch pipe of the natural gas fuel surrounding pipe. natural gas fuel;

The biomass gas heating device enters the biomass gas fuel surrounding pipe through a pipeline, and provides biomass gas fuel for the central combustion device in the furnace through the branch pipe of the biomass gas fuel surrounding pipe;

S3. While the stone material is transported to the inside of the furnace body, the combustion-supporting air in the air supply system enters the central combustion device in the furnace and the combustion device outside the furnace in sequence, and is used for the central combustion device in the furnace and the combustion device outside the furnace. The biomass gas fuel of the device provides combustion-supporting air;

S4. After the stone material enters the furnace body, the natural gas fuel in the external combustion device of the furnace merges with the combustion-supporting air to form a natural gas combustion heat release area, and the biomass gas fuel in the central combustion device in the furnace merges with the combustion-supporting air to form a Biomass gas combustion heat release area, natural gas combustion heat release area and biomass gas combustion heat release area are jointly calcined lime;

S5. After the lime inside the furnace body is calcined, it is discharged through the discharge system.

In the third aspect, a process for producing active lime based on natural gas fuel, including the above-mentioned device for co-producing active lime with natural gas and biomass fuel, in the heat exchange process of the calcination zone, the steps of the heating method produced by using natural gas fuel alone are as follows :

S1. After the stone in the stone bin enters the feeding trolley, it enters the furnace body through the discharge port;

S2. While the stone material is transported to the inside of the furnace body, the natural gas heating device enters the natural gas fuel surrounding pipe through the pipeline, and the branch pipe passing through the natural gas fuel surrounding pipe is the central combustion device in the furnace , The combustion device outside the furnace provides natural gas fuel;

S3. While the stone material is transported to the inside of the furnace body, the combustion-supporting air in the air supply system enters the central combustion device in the furnace and the combustion device outside the furnace in sequence, and is used for the central combustion device in the furnace and the combustion device outside the furnace. The natural gas fuel of the device provides combustion-supporting air;

S4. After the stone material enters the furnace body, the natural gas fuel in the central combustion device in the furnace and the combustion device outside the furnace and the combustion-supporting air merge together to form a combustion exothermic area for calcining lime;

S5. After the lime inside the furnace body is calcined, it is discharged through the discharge system.

In the fourth aspect, a process for producing active lime based on biomass fuel, including the above-mentioned device for co-producing active lime with natural gas and biomass fuel, in the heat exchange process of the calcination zone, the heating method produced by using biomass gas fuel alone The steps are as follows:

S1. After the stone in the stone bin enters the feeding trolley, it enters the furnace body through the discharge port;

S2. While the stone material is transported to the interior of the furnace body, the biomass gas heating device enters the biomass gas fuel surrounding pipe through the pipeline, and the branch pipe passing through the biomass gas fuel surrounding pipe is the The central combustion device in the furnace and the combustion device outside the furnace provide biomass gas fuel;

S3. While the stone material is transported to the inside of the furnace body, the combustion-supporting air in the air supply system enters the central combustion device in the furnace and the combustion device outside the furnace in sequence, and is used for the central combustion device in the furnace and the combustion device outside the furnace. The biomass gas fuel of the device provides combustion-supporting air;

S4. After the stone material enters the furnace body, the biomass gas fuel inside the central combustion device in the furnace and the external combustion device and the combustion-supporting air merge together to form a combustion exothermic area for calcining lime;

S5. After the lime inside the furnace body is calcined, it is discharged through the discharge system.

Compared with the prior art, the present application has at least the following beneficial effects:

1. In this application, a central combustion device in the furnace is installed inside the furnace body, an external combustion device is arranged outside the furnace body, and a gas fuel surrounding pipe is provided on the outer wall of the furnace. The gas fuel surrounding pipe includes a natural gas fuel surrounding pipe and a biomass gas fuel surrounding pipe. The natural gas heating device is connected to the surrounding pipe of natural gas fuel through pipelines, and the branch pipe of natural gas fuel surrounding pipe is connected to the central combustion device in the furnace and the combustion device outside the furnace; the biomass gas heating device is connected to the surrounding pipe of biomass gas fuel through pipelines , the biomass gas fuel surround pipe branch pipe is connected with the central combustion device in the furnace and the combustion device outside the furnace; natural gas fuel and biomass gas fuel are used to provide fuel for the stone in the furnace body, and provide combustion support for the production process through the air supply system Wind, and then unloading through the discharge system; in the heat exchange process of the calcination zone, including: the production of natural gas fuel alone, the production of biomass gas fuel alone, and the heating mode of natural gas and biomass gas combustion mixed heating production The present application has simple, practical and compact structure, short calcination time, high production efficiency, high output, good economy, low production cost, wide application range, high safety, low content of harmful substances, and various production techniques; The central combustion device in the furnace is installed inside the body to make the central heat supply in the furnace more balanced and the output doubled; through the combination of clean fuels such as natural gas and biomass gas, the benefits of carbon reduction and carbon reduction are achieved, and through the The combustion device uses natural gas fuel and the central combustion device in the furnace uses biomass gas fuel to produce, realizing the mixed combustion heating mode in which two fuels with different calorific values are burned in different devices to provide heat in the same area; the lime produced is active The temperature increases, the rate of overburning of lime decreases, and the calcium point of lime increases.

2. The application also includes a biomass solid powder heating device, which can support combustion and reduce fuel costs.

3. In this application, a screening, tilting and rotating distributor is installed on the top of the furnace body, which realizes the requirements of distributing materials in two different processes of gas fuel production and solid fuel production.

4. This application is equipped with a carbon dioxide gas recovery device on the upper part of the furnace preheating zone, which can recycle carbon dioxide gas, and use the principle of carbon dioxide fire extinguishing and flame retardancy to reduce its combustion reaction speed when using high calorific value fuels such as natural gas, so that carbon dioxide gas can be recovered , The capture cost is further reduced.

Description of drawings

In order to illustrate the prior art and the present application more intuitively, several exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the accompanying drawings should generally not be regarded as limiting conditions for the implementation of the present application; for example, those skilled in the art are able to The increase/decrease/attribution division, specific shape, positional relationship, connection mode, size ratio relationship, etc. of some units (parts) are easy to make conventional adjustments or further optimization.

Fig. 1 is the structural representation of the device of a kind of natural gas and biomass fuel coproduction active lime that one embodiment of the present application provides;

Fig. 2 is a schematic structural view of a natural gas heating device according to an embodiment of the present application;

Fig. 3 is a schematic structural view of a biomass gas heating device according to an embodiment of the present application;

Fig. 4 is a schematic structural view of a biomass solid powder heating device according to an embodiment of the present application;

Fig. 5 is a partial schematic diagram one (stone material supply system place) of the embodiment shown in Fig. 1;

Fig. 6 is a partial schematic diagram two (at the carbon dioxide gas recovery device) of the embodiment shown in Fig. 1;

Fig. 7 is a partial schematic diagram three of the embodiment shown in Fig. 1 (central combustion device in the furnace);

Fig. 8 is a partial schematic diagram IV (at the discharge system) of the embodiment shown in Fig. 1 .

Explanation of reference signs:

1. Shaft furnace body roasting system; 11. Furnace body; 111. Guardrail; 112. Carbon dioxide gas recovery device; 113. Carbon dioxide circulation flame-retardant fan; 114. Carbon dioxide gas internal circulation pipe network; 115. Carbon dioxide external transmission pipe network interface ; 12, central combustion device in the furnace; 121, the first nozzle; 122, the second nozzle; 123, the first pipeline; 124, the second pipeline; 13, the combustion device outside the furnace; Flame burner; 14. Primary furnace air seat; 15. Secondary furnace air seat; 16. Gas fuel surrounding pipe; 2. Stone material supply system; 21. Stone material bin; 22. Stone material weighing device; 23. Electric belt conveyor ; 24, feeding trolley; 25, hoist; 26, frame; 27, pull rope;

3. Natural gas heating device; 31. Natural gas supply pressure regulating device; 32. Natural gas heating pipeline; 33. The first flow meter; 34. The first pressure gauge; 35. The first valve; 36. The first safety device; 4. Biomass gas heating device; 41. Biomass gas supply device; 42. Biomass gas pressurization device; 43. Biomass gas heating pipeline; 44. Second flow meter; 45. Second pressure gauge; 46. The second valve; 47. The second safety device; 5. The biomass solid powder heating device; 51. The biomass powder heating device; 52. The biomass powder heating pipeline; 53. The third flowmeter ; 54, the third pressure gauge; 55, the third valve; 56, the third safety device;

6. Air supply system; 61. Primary combustion fan; 62. Secondary combustion fan; 63. Combustion wind cap; 64. Primary combustion fan duct; 65. Secondary combustion fan duct; 66. Combustion air enclosure; 7. Outlet Material system; 71, distribution bin; 72, distribution bin chute; 73, center lower bin; 74, rotating ash device; 75, furnace weighing device; 76, unloading valve; 77, ash hopper ; 78. Sealed ash discharger; 79. Material flow control and tumor removal device; 710. Material flow control and tumor removal device in the central lower silo; 8. Screening tilting rotary distributor.

Detailed ways

The present application will be further described in detail through specific embodiments below in conjunction with the accompanying drawings.

In the description of this application: unless otherwise specified, "plurality" means two or more. The terms "first", "second", and "third" in this application are intended to distinguish the referred objects, and have no special meaning in terms of technical connotation (for example, it should not be understood as a reference to the degree of importance or order, etc. emphasis). Expressions such as "comprising", "including", and "having" also mean "not limited to" (certain elements, components, materials, steps, etc.).

Terms such as "upper", "lower", "left", "right", "middle", etc. quoted in this application are usually for the convenience of intuitive understanding with reference to the drawings, rather than absolute terms for the positional relationship in the actual product limited. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as the scope of this application.

A device for co-producing active lime with natural gas and biomass fuel, as shown in Figure 1-Figure 8, comprising:

Shaft furnace body roasting system 1 includes a furnace body 11, a central combustion device 12 in the furnace and an external combustion device 13. The central combustion device 12 in the furnace provides heat energy for the center of the furnace body 11, and the external combustion device 13 is the The outer space of the furnace body 11 is provided with a guardrail 111; the outer wall of the furnace body 11 is provided with a guardrail 111; the combustion device 13 outside the furnace includes a long-flame burner 131 and a short-flame burner 132; Pipe 16 includes natural gas fuel enclosures and biomass gas fuel enclosures.

The stone supply system 2 includes a stone silo 21 and a feeding trolley 24. The end of the loading trolley 24 is provided with a discharge port. After the stone in the stone silo 21 enters the loading trolley 24, it enters the furnace body 11 through the discharge port. Inside.

Preferably, as shown in Fig. 1 and Fig. 5, the stone material supply system 2 also includes a stone material weighing device 22, an electric belt conveyor 23 and a winch 25, the stone material weighing device 22 is arranged under the stone material bin 21, and the stone material in the stone material bin 21 After the stone is weighed by the stone weighing device 22, it is transported to the feeding trolley 24 through the electric belt conveyor 23, and the stone on the loading trolley 24 is lifted to the furnace body 11 by the winch 25.

Further preferably, the stone silo 21 and the stone weighing device 22 are on the frame 26, the bottom of the stone silo 21 has a discharge port, and is located above the stone weighing device 22, and the below of the stone weighing device 22 is an electric belt conveyor 23, The electric belt conveyor 23 transfers the weighed stones to the feeding trolley 24, the frame 26 is provided with a hoist 25, the feeding trolley 24 is provided with a track, and the hoist 25 transmits the stones to the screening and tilting at the top of the furnace body 11 through the pull rope 27 In the rotary distributor 8, the end of the feeding trolley 24 is provided with a discharge port, through which the stones are directly poured into the screening tilting rotary distributor 8; the end of the electric belt conveyor 23 is connected with a first material storage box, The first material storage box cooperates with the second material storage box on the feeding trolley 24, so that after the electric belt conveyor 23 transfers the stone material to the first material storage box, it is directly poured into the second material storage box, and then passes through the hoist 25 The stone material is transported to the end of the feeding trolley 24, and then poured into the screening and tilting rotary distributor 8 through the discharge port.

Preferably, it also includes a multifunctional distributor, which is arranged on the top of the furnace body 11; the multifunctional distributor is a sieving and tilting rotary distributor 8 (see Figure 1), and the stone material is screened and tilted for 8 minutes. After entering the furnace body 11, the stone material enters the furnace body 11 more evenly and burns. Screening and tilting rotary distributor 8 realizes the material distribution requirements of two different processes of gas fuel production and solid fuel production. By adjusting and replacing the distribution bells with different angles, large-grained stones can be arranged around the kiln wall when gas fuel is used for production. , when solid fuel is used for production, small-grained stones can be arranged around the kiln wall, which effectively reduces the kiln wall effect.

The air supply system 6 provides combustion-supporting air for the central combustion device 12 in the furnace and the combustion device 13 outside the furnace.

Preferably, as shown in Fig. 1, Fig. 7 and Fig. 8, the air supply system 6 includes a primary combustion-supporting blower 61, a secondary combustion-supporting blower 62 and a combustion-supporting wind cap 63, and the combustion-supporting wind cap 63 is located below the central combustion device 12 in the furnace; The primary combustion-supporting fan 61 is connected to the primary combustion-supporting air seat 14 through the primary combustion-supporting fan pipe 64, and the outer wall of the primary furnace air seat 14 communicates with the combustion-supporting air surrounding pipe 66 through the second pipe 124; the combustion-supporting air surrounding pipe 66 passes through the first One pipe and the second branch pipe are connected with the long-flame burner 131 and the short-flame burner 132; the primary combustion-supporting fan 61 enters the cold air area of the first-stage furnace air seat 14 through the primary combustion-supporting fan pipe 64 for preliminary preheating, and enters the furnace The central combustion device 12 is preheated again; the preheated primary combustion-supporting air enters the hot air area again, and enters the combustion-supporting air surrounding pipe 66 through the second pipe 124, and the combustion-supporting air surrounding pipe 66 passes through the first branch pipe and the second branch pipe respectively Provide preheated primary combustion-supporting air for long flame burner 131 and short flame burner 132;

The secondary combustion-supporting fan 62 is connected with the secondary combustion-supporting fan pipe 65 between the secondary furnace air seat 15, and the inner wall of the secondary furnace air seat 15 is connected with the combustion-supporting wind cap 63 through a third pipe, and the third pipe serves as a The effect of material distribution bin, and provides secondary combustion-supporting air for the central combustion device 12 in the furnace and the external combustion device 13.

Preferably, the central combustion device 12 in the furnace is also equipped with a ring-type preheating recovery device to increase the temperature of the primary combustion air and the secondary combustion air, and increase the temperature of the combustion air by absorbing the lime waste heat in the cooling zone of the shaft furnace. To above 150°C, the purpose of cooling the central combustion device 12 in the furnace is achieved, and the purpose of increasing the temperature of the combustion-supporting air and reducing energy consumption is also achieved.

The fuel supply system includes a natural gas heating device 3 and a biomass gas heating device 4. The natural gas heating device 3 and the biomass gas heating device 4 are respectively connected to the furnace body 11 to provide natural gas fuel, Biogas fuel.

Preferably, as shown in Figure 2, the natural gas heating device 3 includes a natural gas source, a natural gas supply pressure regulating device 31 and a natural gas heating pipeline 32, and the natural gas source enters the natural gas heating pipeline after passing through the natural gas supply pressure regulating device 31 32. The natural gas heating pipeline 32 is connected with the surrounding pipe of natural gas fuel; The central combustion device 12 is connected; the natural gas heating pipeline 32 is provided with a first flow meter 33 , a first pressure gauge 34 , a first valve 35 and a first safety device 36 in sequence.

Preferably, as shown in Figure 3, the biomass gas heating device 4 includes a biomass gas source, a biomass gas supply device 41, a biomass gas pressurization device 42, a biomass gas heating pipeline 43, and a biomass gas The gas source enters the biomass gas heating pipeline 43 after passing through the biomass gas supply device 41 and the biomass gas pressurization device 42 in turn, and the biomass gas heating pipeline 43 is connected with the surrounding pipe of the biomass gas fuel; The surrounding pipes are respectively connected with the long-flame burner 131, the short-flame burner 132, and the central combustion device 12 in the furnace through the sixth branch pipe, the seventh branch pipe, and the eighth branch pipe; the biomass gas heating pipe 43 is sequentially provided with A second flow meter 44 , a second pressure gauge 45 , a second valve 46 , and a second safety device 47 .

Preferably, as shown in Figure 4, it also includes a biomass solid powder heating device 5, including a biomass powder, a biomass powder heating device 51 and a biomass powder heating pipeline 52; After the biomass powder heating device 51 enters the biomass powder heating pipeline 52, the biomass powder heating pipeline 52 runs through the outer wall of the furnace body 11 and is connected with the central combustion device 12 in the furnace; the biomass powder heating A third flow meter 53 , a third pressure gauge 54 , a third valve 55 , and a third safety device 56 are sequentially arranged on the pipeline 52 .

In the shaft furnace body roasting system 1, the inner space of the furnace body 11 is divided into three areas from top to bottom: the preheating zone, the calcination zone and the cooling zone; the outer wall of the furnace body 11 is provided with a first-level The furnace air seat 14, the secondary furnace air seat 15, the secondary furnace air seat 15 is located at the lower part of the primary furnace air seat 14; The first spout 121, the second spout 122, the first spout 121 is used for ejecting and providing natural gas or biomass gas, and the second spout 122 is used for ejecting biomass powder; the bottom of the central combustion device 12 in the furnace is provided with a first The pipeline 123, the first pipeline 123 communicates with the first-stage furnace air seat 14, the first pipeline 123 supports the central combustion device 12 in the furnace, and provides a passage for the primary combustion-supporting air; the long-flame burner 131, the short-flame burner 132 is located on the outer wall of the furnace body 11, corresponding to the upper part of the calcination zone, and the long-flame burner 131 is located on the upper part of the short-flame burner 132; Air surrounding pipe 66 , gas fuel surrounding pipe 16 , the gas fuel surrounding pipe 16 includes natural gas fuel surrounding pipe and biomass gas fuel surrounding pipe, and the combustion-supporting air surrounding pipe 66 is located at the lower part of the short flame burner 132 .

The discharge system 7, as shown in Figure 8, is used to unload the lime cooled after being calcined by the shaft furnace body roasting system 1, including a distribution bin 71, a distribution bin chute 72, a center lower bin 73 and The rotary ash discharge device 74, the distribution bin chute 72, and the central lower feed bin 73 are located on the upper part of the rotary ash discharge device 74. The central lower feed bin 73 and multiple distribution bins 71 are arranged at the bottom of the furnace, and along the kiln wall periphery Evenly distributed, the calcium oxide in the distribution bin 71 and the central material lowering bin 73 respectively descends to the top of the rotating ash discharge device 74 through the distribution bin chute 72 and the central material downcomer, and the calcium oxide is discharged to multiple furnaces through rotation In the internal weighing device 75, the weighed calcium oxide is fed into the ash discharge hopper 77 through the discharge valve 76, and the calcium oxide is discharged outside the furnace by a sealed ash discharge machine 78.

Preferably, a material flow control and tumor removal device 79 , and a material flow control and tumor removal device 710 in the central lower silo are also included.

Preferably, as shown in Figure 6, the upper part of the preheating zone of the furnace body 11 is provided with a carbon dioxide gas recovery device 112 and a carbon dioxide circulation flame-retardant fan 113, the carbon dioxide gas recovery device 112 is connected to the carbon dioxide gas internal circulation pipe network 114, and the carbon dioxide gas internal circulation The pipe network 114 is connected to the long-flame burner 131 and the short-flame burner 132 respectively through the ninth branch pipe and the tenth branch pipe after passing through the carbon dioxide circulation flame-retardant fan 113 . The carbon dioxide gas internal circulation pipe network 114 is provided with a carbon dioxide external transmission pipe network interface 115, and the carbon dioxide gas with a content in the range of 37-41% in the carbon dioxide gas recovery device 112 is sequentially transported to the long flame burner 131 through the carbon dioxide gas internal circulation pipe network 114 And the short flame burner 132 is used for adjusting the calcining belt to move down when using high calorific value fuels such as natural gas and using solid fuels for production.

Set up a carbon dioxide gas recovery device 112 to recycle carbon dioxide gas, use the principle of carbon dioxide fire extinguishing and flame retardancy to reduce the combustion reaction speed when using high calorific value fuels such as natural gas, and to adjust the downward movement of the calcination zone when using solid fuels for production . By recycling the carbon dioxide gas in the furnace, the purpose of increasing the concentration of the carbon dioxide gas is achieved, and the cost of recovering and capturing the carbon dioxide gas is further reduced.

Production process: When the stone enters the furnace body 11, the waste heat of the flue gas in the pre-tropical zone is about 150-350°C to preheat the stone. When the stone is preheated to above 450°C, it slowly descends to the calcination zone, and the calcination zone The long-flame burner 131, the short-flame burner 132, the central combustion device 12 in the furnace, the primary combustion-supporting fan 61, and the secondary combustion-supporting fan 62 perform heat exchange with the stone, and the stone completes the decomposition of carbon dioxide during the heat exchange process. , into calcium oxide (lime); the decomposed calcium oxide descends to the cooling zone.

When the stone slowly descends to the upper part of the calcining zone in the furnace, it exchanges heat with the flame ejected from the long-flame burner 131, so that the stone reaches an initial decomposition temperature above 890°C; the stone after initial decomposition slowly descends to the calcining zone in the furnace In the middle part, heat exchange is carried out with the flame ejected from the short-flame burner 132 outside the furnace, so that the stone can reach a temperature above 1100°C and can be completely decomposed. The carbon dioxide in the limestone in this area can be fully decomposed and released, and more than 80% of the Limestone breaks down into calcium oxide (lime). This is because of the combustion characteristics of natural gas and biomass gas and the resistance of the stones in the furnace, the flame of the combustion device 13 outside the furnace cannot penetrate to the inner central area of the furnace body 11. At this time, there are about 20% limestone in the central part of the furnace. Still unable to decompose completely, it slowly descends to the lower part of the calcining zone in the furnace with other decomposed calcium oxide, and performs heat exchange again with the flame released by the central combustion device 12 in the furnace, so that the limestone in the furnace can be completely decomposed. The decomposed calcium oxide slowly descends to the cooling zone inside the furnace body 11 .

During the entire calcination process, the secondary combustion-supporting air (cold air) blown out by the combustion-supporting air hood 63 of the cooling zone in the furnace exchanges heat with the 750-950°C high-temperature red-hot calcium oxide (lime) descending from the cooling zone in countercurrent, and the heat exchange is equal to The high-temperature air continues to rise to the calcining zone in the furnace to participate in the calcination, so that the temperature of the calcining zone is stabilized at the optimum limestone decomposition temperature of 1250°C. When the completely decomposed and cooled calcium oxide slowly enters the lower area of the combustion-supporting wind cap 63 device in the furnace, Calcium oxide temperature is reduced to the range of 50-150°C, achieving the purpose of calcium oxide cooling and heat exchange.

Calcium oxide after cooling enters a plurality of distributing bins 71 and central lower bins 73 arranged on the bottom of the furnace, which are evenly divided according to the periphery of the kiln wall, and the calcium oxide in the distributing bins 71 and central lower bins 73 passes through the The chute 72 and the central material descending pipe descend to the top of the rotary ash discharge device 74, and the calcium oxide is fed into multiple furnace weighing devices 75 through rotation, and the weighed calcium oxide is discharged to the row through the discharge valve 76. In the ash hopper 77, calcium oxide is discharged outside the furnace by a sealed ash machine 78.

A method for a device for co-producing active lime with natural gas and biomass fuel. When the stone in the stone bin 21 enters the feeding trolley 24 through the stone weighing device 22 and is lifted to the screening tilting rotary distributor 8 on the top of the furnace body 11 , when the stone enters the furnace body 11, the stone is preheated with the waste heat of the flue gas in the range of about 150-350°C in the furnace preheating zone, and when the preheated stone reaches above 450°C, it slowly descends to the calcination zone, and the calcination zone The long-flame burner 131, the short-flame burner 132, the central combustion device 12 in the furnace and the primary combustion-supporting fan 61 together emit hot flames to exchange heat with the stones in the calcination zone, and the stones complete the decomposition of carbon dioxide during the heat exchange process. Calcium oxide is formed.

In the heat exchange process of the calcination zone, it is mainly completed by four different heating methods, namely: natural gas and biomass gas combustion mixed heating production, natural gas fuel production alone, biomass gas fuel production alone, biomass powder Material auxiliary heating production.

When using natural gas fuel and biomass gas fuel for co-production, the specific steps are as follows:

S1. After passing through the stone weighing device 22, the stone in the stone bin 21 is transferred to the feeding trolley 24 through the electric belt conveyor 23, and the stone on the loading trolley 24 is lifted to the screening tilting rotary distributor 8 by the winch 25, Enter the furnace body 11 after being sieved by the sieving tilting rotary distributor 8;

S2. The natural gas source enters the natural gas heating pipeline 32 through the natural gas supply pressure regulating device 31. The natural gas heating pipeline 32 is sequentially provided with a first flow meter 33, a first pressure gauge 34, a first valve 35, and a first safety valve. Device 36, the end of the natural gas heating pipeline 32 is connected to the natural gas fuel surrounding pipe; the natural gas fuel surrounding pipe distributes gas to the long-flame burner 131 and the short-flame burner 132 through the third branch pipe and the fourth branch pipe respectively, forming an independent calcined lime in the exothermic area of natural gas combustion;

At the same time, the biomass gas source enters the biomass gas heating pipeline 43 sequentially through the biomass gas supply device 41 and the biomass gas pressurization device 42, and the biomass gas heating pipeline 43 is sequentially provided with a second flowmeter 44 , the second pressure gauge 45, the second valve 46, the second safety device 47, the end of the biomass gas heating pipeline 43 is connected with the surrounding pipe of biomass gas fuel; The inner central combustion device 12 is connected to complete the gas supply to the central combustion device 12 in the furnace;

S3. During the production process, the primary combustion-supporting fan 61 enters the cold air area of the first-stage furnace air seat 14 through the primary combustion-supporting fan pipe 64 for preliminary preheating, and then enters the central combustion device 12 in the furnace for re-preheating; the primary combustion-supporting after preheating The wind enters the hot blast area of the primary furnace air seat 14 again, and enters the combustion-supporting air surrounding pipe 66 through the second pipeline 124, and the combustion-supporting air surrounding pipe 66 is the long-flame burner 131 and the short-flame burner 131 through the first branch pipe and the second branch pipe respectively. Flame burner 132 provides the primary combustion-supporting air after preheating; The secondary combustion-supporting air that secondary combustion-supporting blower 62 produces enters secondary furnace air seat 15 through secondary combustion-supporting blower pipeline 65, and enters combustion-supporting wind hood 63 through the third pipeline, Provide secondary combustion-supporting air for the central combustion device 12 in the furnace and the external combustion device 13;

S4. When the stone enters the furnace body 11 and slowly descends to the preheating zone inside the furnace body 11, the waste heat of the flue gas in the preheating zone preheats the stone; when the stone slowly descends to the calcination zone, the long flame burner 131, The natural gas fuel of the short-flame burner 132 forms the combustion flame outside the furnace to supply heat to the calcining zone through the primary combustion air supplied by the primary combustion air blower 61 and the secondary combustion air supplied by the secondary combustion air blower 62, and the biomass in the central combustion device 12 in the furnace Gas fuel is ejected at the first nozzle 121, and merges with the primary combustion-supporting air supplied by the primary combustion-supporting fan 61 and the secondary combustion-supporting air supplied by the secondary combustion-supporting fan 62 to form a combustion flame in the furnace to supply heat to the calcining zone. The combustion flames in the furnace jointly form a combustion exothermic area to calcine the lime, so that the lime can be completely decomposed; the decomposed calcium oxide slowly descends to the cooling zone inside the furnace body 11;

S5. Calcium oxide after cooling enters the distribution bin 71 and the center lower bin 73, and the calcium oxide in the split bin 71 and the center lower bin 73 drops to the rotating shaft through the distribution bin slide pipe 72 and the center material drop pipe respectively. On the top of the ash discharge device 74, calcium oxide is fed into a plurality of weighing devices 75 in the furnace by rotation, and the weighed calcium oxide is fed into the ash discharge hopper 77 through the discharge valve 76 and is handled by the sealed ash discharge machine 78. The material is discharged outside the furnace body 11.

When using natural gas fuel alone for production, the specific steps are as follows:

S1. After passing through the stone weighing device 22, the stone in the stone bin 21 is transferred to the feeding trolley 24 through the electric belt conveyor 23, and the stone on the loading trolley 24 is lifted to the screening tilting rotary distributor 8 by the winch 25, Enter the furnace body 11 after being sieved by the sieving tilting rotary distributor 8;

S2. The natural gas source enters the natural gas heating pipeline 32 through the natural gas supply pressure regulating device 31. The natural gas heating pipeline 32 is sequentially provided with a first flow meter 33, a first pressure gauge 34, a first valve 35, and a first safety valve. Device 36, the end of the natural gas heating pipeline 32 is connected to the natural gas fuel surrounding pipe; the natural gas fuel surrounding pipe respectively passes through the third branch pipe, the fourth branch pipe, and the fifth branch pipe to form the long flame burner 131 and the short flame burner 132 , The central combustion device 12 in the furnace distributes gas;

S3. During the production process, the primary combustion-supporting fan 61 enters the cold air area of the first-stage furnace air seat 14 through the primary combustion-supporting fan pipe 64 for preliminary preheating, and then enters the central combustion device 12 in the furnace for re-preheating; the primary combustion-supporting after preheating The wind enters the hot blast area of the primary furnace air seat 14 again, and enters the combustion-supporting air surrounding pipe 66 through the second pipeline 124, and the combustion-supporting air surrounding pipe 66 is the long-flame burner 131 and the short-flame burner 131 through the first branch pipe and the second branch pipe respectively. Flame burner 132 provides the primary combustion-supporting air after preheating; The secondary combustion-supporting air that secondary combustion-supporting blower 62 produces enters secondary furnace air seat 15 through secondary combustion-supporting blower pipeline 65, and enters combustion-supporting wind hood 63 through the third pipeline, Provide secondary combustion-supporting air for the central combustion device 12 in the furnace and the external combustion device 13;

S4. When the stone enters the furnace body 11 and slowly descends to the preheating zone inside the furnace body 11, the waste heat of the flue gas in the preheating zone preheats the stone; when the stone slowly descends to the calcination zone, the long flame burner 131, The natural gas fuel of the short flame burner 132 forms the combustion flame outside the furnace to supply heat to the calcining zone through the primary combustion air supplied by the primary combustion air blower 61 and the secondary combustion air supplied by the secondary combustion air blower 62. The natural gas fuel of the central combustion device 12 in the furnace It is ejected at the first nozzle 121, and merges with the primary combustion-supporting air supplied by the primary combustion-supporting fan 61 and the secondary combustion-supporting air supplied by the secondary combustion-supporting fan 62 to form a combustion flame in the furnace to supply heat to the calcining zone. Combustion flames together form a natural gas combustion exothermic area for calcining lime, so that the lime can be completely decomposed; the decomposed calcium oxide slowly descends to the cooling zone inside the furnace body 11;

S5. Calcium oxide after cooling enters the distribution bin 71 and the center lower bin 73, and the calcium oxide in the split bin 71 and the center lower bin 73 drops to the rotating shaft through the distribution bin slide pipe 72 and the center material drop pipe respectively. On the top of the ash discharge device 74, calcium oxide is fed into a plurality of weighing devices 75 in the furnace by rotation, and the weighed calcium oxide is fed into the ash discharge hopper 77 through the discharge valve 76 and is handled by the sealed ash discharge machine 78. The material is discharged outside the furnace body 11.

When using biomass gas fuel alone for production, the specific steps are as follows:

S1. After passing through the stone weighing device 22, the stone in the stone bin 21 is transferred to the feeding trolley 24 through the electric belt conveyor 23, and the stone on the loading trolley 24 is lifted to the screening tilting rotary distributor 8 by the winch 25, Enter the furnace body 11 after being sieved by the sieving tilting rotary distributor 8;

S2. The biomass gas source enters the biomass gas heating pipeline 43 sequentially through the biomass gas supply device 41 and the biomass gas pressurization device 42, and the biomass gas heating pipeline 43 is sequentially provided with a second flow meter 44 , the second pressure gauge 45, the second valve 46, the second safety device 47, the end of the biomass gas heating pipeline 43 is connected with the biomass gas fuel surrounding pipe; the biomass gas fuel surrounding pipe respectively passes through the sixth branch pipeline, The seventh branch pipe and the eighth branch pipe distribute gas for the long-flame burner 131, the short-flame burner 132, and the central combustion device 12 in the furnace;

S3. During the production process, the primary combustion-supporting fan 61 enters the cold air area of the first-stage furnace air seat 14 through the primary combustion-supporting fan pipe 64 for preliminary preheating, and then enters the central combustion device 12 in the furnace for re-preheating; the primary combustion-supporting after preheating The wind enters the hot blast area of the primary furnace air seat 14 again, and enters the combustion-supporting air surrounding pipe 66 through the second pipeline 124, and the combustion-supporting air surrounding pipe 66 is the long-flame burner 131 and the short-flame burner 131 through the first branch pipe and the second branch pipe respectively. Flame burner 132 provides the primary combustion-supporting air after preheating; The secondary combustion-supporting air that secondary combustion-supporting blower 62 produces enters secondary furnace air seat 15 through secondary combustion-supporting blower pipeline 65, and enters combustion-supporting wind hood 63 through the third pipeline, Provide secondary combustion-supporting air for the central combustion device 12 in the furnace and the external combustion device 13;

S4. When the stone enters the furnace body 11 and slowly descends to the preheating zone inside the furnace body 11, the waste heat of the flue gas in the preheating zone preheats the stone; when the stone slowly descends to the calcination zone, the long flame burner 131, The biomass gas fuel of the short-flame burner 132 forms the combustion flame outside the furnace to supply heat to the calcining zone through the primary combustion air supplied by the primary combustion air blower 61 and the secondary combustion air supplied by the secondary combustion air blower 62. The central combustion device 12 in the furnace Biomass gas fuel is ejected at the first nozzle 121, and merges with the primary combustion-supporting air supplied by the primary combustion-supporting fan 61 and the secondary combustion-supporting air supplied by the secondary combustion-supporting fan 62 to form a combustion flame in the furnace to supply heat to the calcination zone, and the combustion outside the furnace The flame and the combustion flame in the furnace jointly form a biomass gas combustion exothermic area to calcine the lime, so that the lime can be completely decomposed; the decomposed calcium oxide slowly descends to the cooling zone inside the furnace body 11;

S5. Calcium oxide after cooling enters the distribution bin 71 and the center lower bin 73, and the calcium oxide in the split bin 71 and the center lower bin 73 drops to the rotating shaft through the distribution bin slide pipe 72 and the center material drop pipe respectively. On the top of the ash discharge device 74, calcium oxide is fed into a plurality of weighing devices 75 in the furnace by rotation, and the weighed calcium oxide is fed into the ash discharge hopper 77 through the discharge valve 76 and is handled by the sealed ash discharge machine 78. The material is discharged outside the furnace body 11.

When using biomass powder to assist heating production, the specific steps are as follows:

S1. After passing through the stone weighing device 22, the stone in the stone bin 21 is transferred to the feeding trolley 24 through the electric belt conveyor 23, and the stone on the loading trolley 24 is lifted to the screening tilting rotary distributor 8 by the winch 25, Enter the furnace body 11 after being sieved by the sieving tilting rotary distributor 8;

S2. Use one of natural gas fuel and biomass gas fuel to feed the natural gas fuel surrounding pipe, the biomass gas fuel surrounding pipe to the long flame burner 131, and the short flame burner 132, and use biomass powder fuel to The central combustion device 12 in the furnace completes feeding;

When natural gas fuel is used, the natural gas source enters the natural gas heating pipeline 32 through the natural gas supply pressure regulating device 31, and the end of the natural gas heating pipeline 32 is connected with the natural gas fuel surrounding pipe; the natural gas fuel surrounding pipe respectively passes through the third branch pipeline , The fourth branch pipeline distributes gas for the long flame burner 131 and the short flame burner 132, forming an independent natural gas combustion heat release area for calcining lime; when using biomass gas fuel, the biomass gas source passes through the biomass gas The gas supply device 41 and the biomass gas pressurizing device 42 enter the biomass gas heating pipeline 43, and the end of the biomass gas heating pipeline 43 is connected with the surrounding pipe of the biomass gas fuel; The six branch pipes and the seventh branch pipe distribute gas to the long-flame burner 131 and the short-flame burner 132 to form an independent biomass gas combustion heat release area for calcining lime;

The central combustion device 12 in the furnace has two functions of gas injection and solid powder fuel injection. When biomass powder fuel is used to supply the central combustion device 12 in the furnace, the supply of natural gas fuel or biomass gas fuel is closed and stopped The biomass powder fuel enters the biomass powder heating pipeline 52 after the biomass powder heating device 51, and the biomass powder heating pipeline 52 runs through the outer wall of the furnace body 11 and is connected with the central combustion device 12 in the furnace , the biomass powder blows the biomass powder to the entire calcination zone through the second nozzle 122 of the central combustion device 12 in the furnace;

S3. During the production process, the primary combustion-supporting fan 61 enters the cold air area of the first-stage furnace air seat 14 through the primary combustion-supporting fan pipe 64 for preliminary preheating, and then enters the central combustion device 12 in the furnace for re-preheating; the primary combustion-supporting after preheating The wind enters the hot blast area of the primary furnace air seat 14 again, and enters the combustion-supporting air surrounding pipe 66 through the second pipeline 124, and the combustion-supporting air surrounding pipe 66 is the long-flame burner 131 and the short-flame burner 131 through the first branch pipe and the second branch pipe respectively. Flame burner 132 provides the primary combustion-supporting air after preheating; The secondary combustion-supporting air that secondary combustion-supporting blower 62 produces enters secondary furnace air seat 15 through secondary combustion-supporting blower pipeline 65, and enters combustion-supporting wind hood 63 through the third pipeline, Provide secondary combustion-supporting air for the central combustion device 12 in the furnace and the external combustion device 13;

S4. When the stone material enters the furnace body 11 and slowly descends to the preheating zone inside the furnace body 11, the waste heat of the flue gas in the preheating zone preheats the stone material; when the stone material slowly descends to the calcination zone, the long flame burner 131, The natural gas fuel or biomass gas fuel of the short-flame burner 132 forms the combustion flame outside the furnace to supply heat to the calcining zone through the primary combustion air supplied by the primary combustion air fan 61 and the secondary combustion air supplied by the secondary combustion air fan 62, and the center of the furnace burns The biomass powder fuel of the device 12 is ejected at the second nozzle 122, and merges with the primary combustion air supplied by the primary combustion fan 61 and the secondary combustion air supplied by the secondary combustion fan 62 to form a combustion flame in the furnace to supply heat to the calcination zone. , the combustion flame outside the furnace and the combustion flame in the furnace jointly form a combustion exothermic area for calcining lime, so that the lime can be completely decomposed; the decomposed calcium oxide slowly descends to the cooling zone inside the furnace body 11;

S5. Calcium oxide after cooling enters the distribution bin 71 and the center lower bin 73, and the calcium oxide in the split bin 71 and the center lower bin 73 drops to the rotating shaft through the distribution bin slide pipe 72 and the center material drop pipe respectively. On the top of the ash discharge device 74, calcium oxide is fed into a plurality of weighing devices 75 in the furnace by rotation, and the weighed calcium oxide is fed into the ash discharge hopper 77 through the discharge valve 76 and is handled by the sealed ash discharge machine 78. The material is discharged outside the furnace body 11.

When using biomass powder injection, the central combustion device 12 in the furnace stops supplying gaseous fuels such as natural gas fuel and biomass gas fuel and the combustion-supporting air provided by the primary combustion-supporting fan 61 . The combustion-supporting air used for biomass powder injection combustion comes from the primary combustion-supporting fan 61 and the secondary combustion-supporting fan 62, and the combustion-supporting air cap 63 provided at the bottom of the central combustion device 12 in the furnace supplies air to the furnace, and the supplied combustion-supporting air comes from the furnace The bottom conducts heat exchange with the lime countercurrently from bottom to top, and generates high-temperature air at the same temperature by exchanging with the heat energy released by the lime in the furnace cooling zone at about 600°C. The high-temperature air directly blows the biomass blown out of the central combustion device 12 in the furnace The powder is ignited to form a combustion area, through the air pressure of the secondary combustion fan 62, the air heat energy of the entire cooling zone runs through the entire calcination zone to form an integral calcination combustion area in the furnace, which not only achieves the purpose of cooling lime, but also realizes secondary combustion. For the purpose of air combustion and waste heat utilization.

In this application, a central combustion device in the furnace is installed in the furnace body of a single-chamber shaft furnace, and a combustion device outside the furnace is installed outside the furnace, and natural gas fuel and biomass gas fuel are used to provide fuel for the stone in the furnace body, and the air supply system is used for Combustion-supporting air is provided in the production process, and then the material is unloaded through the discharge system; the structure of this application is simple, practical and compact, the calcination time is short, the production efficiency is high, the output is high, the economy is good, the production cost is low, the application range is wide, and the production process is diverse .

By setting the central combustion device inside the furnace body, the heat supply in the center of the furnace is more balanced, which solves the problem of heat energy when the diameter of the kiln body is too large due to the short combustion flame of natural gas and biomass gas in the traditional peripheral burner gas shaft kiln. The problems of low output and high lime burning rate caused by the inability to reach the center of the furnace have doubled the output of the traditional single-chamber shaft furnace, and the output and production utilization factor have been higher than the current double-chamber lime kiln.

Through the combination of clean fuels such as natural gas and biomass gas, the social benefits of "carbon reduction and carbon reduction" and the dual purpose of "improving quality and efficiency" are achieved. The combustion device is produced with biomass gas fuel, which realizes the mixed combustion heating supply mode in which two fuels with different calorific values are burned in different devices to provide heat in the same area, and solves the problem of high calorific value fuels such as natural gas and low calorific value such as biomass gas. The key issue is that the fuel cannot be directly mixed and burned; especially when using biomass gas fuel alone, the fuel cost can be reduced by more than 40% compared with coal, and the deep utilization of biofuel can reduce the seriousness caused by the use of fossil fuel to the environment Pollution is of great significance to improving the overall lime production process level, reducing production costs, improving product quality, and reducing pollution and carbon, improving the ecological environment, and ensuring national energy security.

By using natural gas fuel and biomass gas fuel, it is a clean fuel with high safety and low content of harmful substances. It will not produce toxic gases such as carbon monoxide during combustion, and will not endanger human health. The density is lighter than air. Floating in the sky, it is not easy to form an explosion source.

Combustion support and fuel cost reduction can be achieved by setting a biomass solid powder heating device.

By setting a screening tilting rotary distributor on the top of the furnace body, the material distribution requirements of two different processes for gas fuel production and solid fuel production are realized, so that when gas production is used, large-grained stones are arranged around the kiln wall. When producing solid fuel, small-grained stones can be arranged around the kiln wall, which effectively reduces the kiln wall effect.

By installing a carbon dioxide gas recovery device on the upper part of the furnace preheating zone, the carbon dioxide gas can be recycled, and the principle of carbon dioxide fire extinguishing and flame retardant can be used to reduce the combustion reaction speed when using high calorific value fuels such as natural gas, so that the carbon dioxide gas can be recovered and captured. Costs are further reduced.

Compared with the ordinary mixing coal-fired shaft furnace, the activity of the lime produced by the device and method of the present application can be increased by 80-150mL, the overburning rate of lime can be reduced by more than 8%, and the calcium point of lime can be increased by more than 8%.

This application promotes the transformation and replacement of lime fuel selection in coal production, and is of key significance to realize the green and carbon reduction upgrade of the lime industry and solve the common bottleneck of the industry; the solid powder in this application can also use coal, etc. in addition to biomass powder Solid fuel, which retains the functions of using coal and other solid fuels to produce lime, and realizes the dual-use production of gas and coal.

The natural gas fuel used produces carbon dioxide and water after combustion. Compared with coal and heavy oil, the harmful substances produced by burning natural gas are greatly reduced. Replacing coal with natural gas can reduce nitrogen oxide emissions by 80-90%, and carbon monoxide emissions can be reduced 52%, and basically eliminate the emission of sulfur dioxide and the generation of urban acid rain.

The content of harmful substances in the biomass fuel energy used is very low. Every time 1000 tons of straw or firewood is used to replace coal, while reducing the emission of about 1400 tons of CO ₂ , it can also reduce the emission of about 4 tons of SO ₂ and about 10 tons of soot. The conversion process of biomass fuel energy is to synthesize carbon dioxide and water into biomass through the photosynthesis of green plants, and the use of biomass energy generates carbon dioxide and water, forming a cycle of carbon dioxide emission process, which can effectively reduce the net emission of human carbon dioxide , reduce the greenhouse effect.

It can realize zero emission of greenhouse gas CO ₂ . CO ₂ in the atmosphere enters organisms through photosynthesis, and the carbon of organisms becomes CO ₂ through combustion, degradation and respiration, and then returns to nature, thus forming a cyclic chain of carbon elements. Theoretically speaking, the utilization of biomass energy can basically achieve zero emission of CO ₂ .

The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features), for the sake of concise description, all possible combinations of the various technical features in the above embodiments are not described; these are not clear All the written examples should also be regarded as within the scope of the description in this specification.

The present application has been described more specifically and in detail through general descriptions and specific examples above. It should be understood that based on the technical concept of the present application, some conventional adjustments or further innovations can also be made to these specific embodiments; Also fall within the protection scope of the claims of the present application.

Claims (9)

1. A device for the coproduction of active lime with natural gas and biomass fuel, characterized in that it comprises: The furnace body roasting system of the shaft furnace includes a furnace body, a central combustion device in the furnace and an external combustion device. The central combustion device in the furnace provides heat energy for the central part of the furnace body, and the external combustion device is the The external space of the body provides heat energy; the stone material supply system includes a stone silo and a loading trolley, and the end of the loading trolley is provided with a discharge port. After the stone in the stone silo enters the loading trolley, it enters through the discharge port In the furnace body; an air supply system, which provides combustion-supporting air for the central combustion device in the furnace and the external combustion device; a fuel supply system, which includes a natural gas heating device and a biomass gas heating device; A system for unloading the lime that has been calcined and cooled by the shaft furnace body roasting system; The outer wall of the furnace body is provided with gas fuel surrounding pipes, and the gas fuel surrounding pipes include natural gas fuel surrounding pipes and biomass gas fuel surrounding pipes; the natural gas heating device is connected to the natural gas fuel surrounding pipes through pipelines, and The natural gas fuel surrounding pipe has several natural gas fuel surrounding pipe branch pipes, and the natural gas fuel surrounding pipe branch pipes communicate with the furnace central combustion device and the furnace external combustion device; the biomass gas heating device communicates with the biomass gas heating device through pipes The material gas fuel surrounding pipe is connected, and the biomass gas fuel surrounding pipe has several biomass gas fuel surrounding pipe branch pipes, and the several biomass gas fuel surrounding pipe branch pipes communicate with the central combustion device in the furnace and the external combustion device. 2. the device of natural gas and biomass fuel coproduction active lime according to claim 1, is characterized in that, described stone material supply system also comprises stone material weighing device, electric belt conveyor and winch, and described stone material weighing device is set Below the stone silo, the stones in the stone silo are weighed by the stone weighing device and then transferred to the loading trolley through the electric belt conveyor, and the stones on the loading trolley are lifted to the The furnace body. 3. The device of natural gas and biomass fuel co-production active lime according to claim 2, is characterized in that, also comprises multifunctional distributor, and described multifunctional distributor is arranged on the top of described furnace body; The functional distributor is a sieving tilting rotary distributor, and the stone enters the furnace body after passing through the screening tilting rotary distributor. 4. The device for co-producing active lime with natural gas and biomass fuel according to claim 3, characterized in that, the inner space of the furnace body is divided into three zones: a preheating zone, a calcination zone and a cooling zone from top to bottom ; The outer wall of the furnace body corresponds to the lower area of the calcining zone provided with a primary furnace air seat and a secondary furnace air seat, and the secondary furnace air seat is located at the lower part of the primary furnace air seat; The central combustion device in the furnace is located at the lower part of the calcination zone, and the top of the central combustion device in the furnace is provided with a first nozzle and a second nozzle, and the first nozzle is used to inject natural gas or biomass gas. The second nozzle is used for spraying biomass powder; the bottom of the central combustion device in the furnace is provided with a first pipeline, and the first pipeline communicates with the first-stage furnace air seat, and the first pipeline is connected to the central combustion chamber in the furnace. The device plays a supporting role and provides a channel for the primary combustion air; The combustion device outside the furnace is located on the outer wall of the furnace body and corresponds to the upper part of the calcination zone. The combustion device outside the furnace includes a long-flame burner and a short-flame burner, and the long-flame burner is located on the top of the short-flame burner; The outer wall of the furnace body corresponds to the upper area of the calcination zone and is provided with a combustion-supporting air surrounding pipe and a gas fuel surrounding pipe sequentially from top to bottom; the combustion-supporting air surrounding pipe is located at the lower part of the short-flame burner. 5. The device of natural gas and biomass fuel co-production of active lime according to claim 4, characterized in that, the air supply system comprises a combustion-supporting blower, a secondary combustion-supporting blower and a combustion-supporting wind cap; the combustion-supporting wind cap is located at Below the central combustion device in the furnace; The primary combustion-supporting fan is connected to the first-stage furnace air seat through a primary combustion-supporting fan pipe, and the outer wall of the first-stage furnace air seat communicates with the combustion-supporting air surrounding pipe through the second pipe, and the combustion-supporting air surrounding pipe passes through the The first branch pipe and the second branch pipe are connected with the long-flame burner and the short-flame burner to provide primary combustion-supporting air for the long-flame burner and the short-flame burner; The secondary combustion-supporting fan is connected to the secondary combustion-supporting fan seat through the secondary combustion-supporting fan pipe, and the secondary combustion-supporting fan seat is connected to the combustion-supporting air cap through the third pipe, which is the central combustion device in the furnace, the furnace The external combustion device provides secondary combustion air. 6. The device of natural gas and biomass fuel co-production active lime according to claim 5, characterized in that, the natural gas heating device comprises a natural gas source, a natural gas supply pressure regulating device and a natural gas heating pipeline, the The natural gas source enters the natural gas heating pipeline after passing through the natural gas supply pressure regulating device, and the natural gas heating pipeline is connected with the natural gas fuel surrounding pipe; the natural gas fuel surrounding pipe respectively passes through the third branch pipeline, the fourth The branch pipe and the fifth branch pipe are connected to the long-flame burner, short-flame burner, and central combustion device in the furnace; the natural gas heating pipe is sequentially provided with a first flow meter, a first pressure gauge, and a first valve , the first safety device; The biomass gas heating device includes a biomass gas source, a biomass gas supply device, a biomass gas pressurization device, and a biomass gas heating pipeline, and the biomass gas source passes through the biomass gas successively. After the gas supply device and the biomass gas pressurization device enter the biomass gas heating pipeline, the biomass gas heating pipeline is connected with the biomass gas fuel surrounding pipe; the biomass gas fuel surrounding pipe respectively passes through the second The six branch pipes, the seventh branch pipe, and the eighth branch pipe are connected to the long flame burner, short flame burner, and central combustion device in the furnace; the biomass gas heating pipe is sequentially provided with a second flow meter, The second pressure gauge, the second valve, and the second safety device. 7. The device of natural gas and biomass fuel coproduction active lime according to claim 6, is characterized in that, also comprises biomass solid powder heating device; Said biomass solid powder heating device comprises biomass powder material, biomass powder heating device and biomass powder heating pipeline; the biomass powder enters the biomass powder heating pipeline after passing through the biomass powder heating device, and the biomass powder heat supply The pipeline runs through the outer wall of the furnace body and is connected with the central combustion device in the furnace; the biomass powder heating pipeline is provided with a third flowmeter, a third pressure gauge, a third valve and a third safety device in sequence. 8. The device of natural gas and biomass fuel co-production active lime according to claim 7, characterized in that, the upper part of the preheating zone of the furnace body is provided with a carbon dioxide gas recovery device and a carbon dioxide circulation flame-retardant fan, and the carbon dioxide The gas recovery device is connected to the carbon dioxide gas internal circulation pipe network, and the carbon dioxide gas internal circulation pipe network is connected to the long-flame burner and the short-flame burner through the ninth branch pipe and the tenth branch pipe respectively after passing through the carbon dioxide circulation flame-retardant fan . 9. The device for co-producing active lime with natural gas and biomass fuel according to claim 8, characterized in that, the discharge system includes a distribution bin, a distribution bin chute, a central lower bin and a rotary ash discharge device , the distribution bin chute and the central lower bin are located on the upper part of the rotary ash discharge device, the central lower bin and multiple distribution bins are arranged at the bottom of the furnace and evenly distributed along the periphery of the kiln wall, so The calcium oxide in the distribution bin and the central feeding bin is respectively lowered to the top of the rotating ash discharge device through the distribution bin slide pipe and the central material downpipe, and the calcium oxide is fed into multiple weighing devices in the furnace through rotation. The weighed calcium oxide is discharged into the ash discharge hopper through the unloading valve, and the calcium oxide is discharged out of the furnace by the sealed ash discharger.

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