CN100458282C - Method for burning petroleum coke or gasified remained coke, and inner mixed type combustion equipment - Google Patents

Abstract

A method for burning petroleum coke includes adding petroleum coke, wear-proof carrier particle and sulfur caring agent into internal mixed combustion chamber and mixing said materials with air there for making petroleum coke be burned there and be desulfurized then entering material into lifting tube for continuous-burning, carrying out gas-smoke separation and sending fly ash being separated out back to said chamber for being burned there cyclically. The burning device used for carrying out said method is also disclosed.

Description

Internal mixing combustion device for burning petroleum coke or gasified waste coke

technical field

The invention relates to the technical fields of coal chemical industry and petrochemical industry, in particular to an internal mixing combustion device mainly using petroleum coke or gasified residual coke as fuel to burn petroleum coke or gasified residual coke.

Background technique

my country produces about 600,000 tons of high-sulfur petroleum coke every year. This kind of petroleum coke cannot be used for high value-added products such as needle coke due to its high sulfur content. The output of petroleum coke will increase year by year, so the outlet of high-sulfur petroleum coke has become an urgent problem for petrochemical enterprises to solve.

According to the research on the composition and basic characteristics of petroleum coke, it is shown that petroleum coke has less ash content and high fixed carbon content. The fluidized bed gasifier can react with water vapor and oxygen to generate synthesis gas. This device will produce very fine gasification coke, which must also be burned up. Therefore, the best outlet for high-sulfur petroleum coke is: (1) high-sulfur petroleum coke is used for sulfur-fixed combustion to generate steam and generate electricity; (2) high-sulfur petroleum coke is gasified in a gasifier to produce syngas, Waste coke is burned to generate steam and generate electricity, forming a polygeneration technology.

In terms of the combustion of high-sulfur petroleum coke, due to the high sulfur content of high-sulfur petroleum coke, there is _more SO in the flue gas produced by combustion, which becomes the source of air pollution and acid rain; Due to the characteristics of high ignition temperature, low combustion characteristic index, and long combustion time, it is an urgent problem to adopt a suitable combustion method to realize efficient and clean combustion of high-sulfur petroleum coke. In terms of petroleum coke gasification to synthesis gas, since the carbon conversion rate of petroleum coke is only about 85% when it is gasified in the gasifier, about 15% of the carbon is discharged from the gasifier in the form of residual coke. The part of gasified waste coke can also be used as fuel to generate steam or generate electricity. However, due to the fine particle size of the gasified coke, which is only 10-30 μm on average, if the traditional circulating fluidized bed boiler is used for combustion, the residence time of the gasified coke in the furnace will be too short, and the combustion will be incomplete. The required light-off temperature cannot be established; and because the circulation rate of the circulating fluidized bed boiler itself is low, and the particle size of the gasified coke powder is too fine to cause its own poor fluidization performance, the circulation rate will be even lower. will seriously reduce the combustion efficiency. At present, no method and device for burning gasified coke fine powder have been reported. Therefore, a method and device that can not only burn high-sulfur petroleum coke efficiently and cleanly, but also burn gasified coke efficiently is the purpose of the present invention.

At present, there are mainly two technologies for clean combustion of high-sulfur petroleum coke at home and abroad: circulating fluidized bed boiler and riser combustion gasification.

In terms of circulating fluidized bed boiler combustion technology, foreign countries take the US Nisco 375t/h evaporation capacity full-fired petroleum coke circulating fluidized bed boiler (100Mwe) designed and built by Foster-Wheeler as a typical representative. However, there is no large-scale complete set of technology for the clean combustion of high-sulfur petroleum coke in China, and the current practice is mainly to introduce foreign complete sets of technology. However, there are many problems when burning high-sulfur petroleum coke with circulating fluidized bed boilers, such as short residence time of particles in the fluidized bed, large amount of ash, serious loss of fly ash, incomplete combustion, and It is easy to form slag and blockage, large wear and low cycle rate.

Aiming at the problems of light-off and burnout and slag formation at the back of the circulating fluidized bed when burning petroleum coke in circulating fluidized bed boilers, a domestic patent No. ZL01266279.8 and ZL01134299.4 designed a petroleum coke burning The circulating fluidized bed is equipped with a thermal insulation and anti-wear layer at the lower part of the circulating bed to form a high temperature zone, which is conducive to the ignition of petroleum coke, and the air supply pipeline is divided into a primary air pipeline and a secondary air pipeline to achieve staged combustion and reduce NO _X and _SO2 emissions. The fuel used in this patent is a mixed fuel of petroleum coke and coal, the desulfurizer is limestone, and the particle size of the mixed fuel particles is a wide screen with a particle size greater than 0 and less than 30mm, which has the advantages of achieving material balance in the bed and reducing system energy consumption. However, the circulating fluidized bed has the same disadvantages as the aforementioned circulating fluidized bed boiler, such as complex structure, bulky size, and large footprint; moreover, the particle size of the fuel particles used in the circulating fluidized bed is relatively coarse, so it is not suitable for burning relatively large boilers. High-sulfur petroleum coke or gasified waste coke particles with small particle size, because the structure of the circulating fluidized bed will cause the residence time of fine particles in it to be short, and the fine particles are not easy to fluidize; in addition, the circulating fluidized bed also has The disadvantages are low operating gas velocity, low system cycle rate, and poor ability to capture fly ash and circulate combustion.

The M.W.Kellogg Company of the United States transplanted the catalytic cracking riser technology for the combustion and gasification of coal and petroleum coke. Compared with circulating fluidized bed boilers, the riser combustion technology has the advantages of high operating gas velocity, large circulation rate, high mass transfer rate between gas and solid, high heat input intensity, low Ca/S ratio and low operating temperature, which are beneficial to high-sulfur boilers. Advantages of Petroleum Coke Combustion. But at the same time, there are some unfavorable factors such as small particle concentration in the bed, less back-mixing, short particle residence time, low calorific value per unit mass of particles, low feeding rate, and difficult to maintain stable storage capacity in the riser. The shortcomings of petroleum coke or gasification waste coke combustion, this technology is still in the pilot test stage abroad.

Contents of the invention

The technical problem to be solved by the present invention is to provide an internal mixing combustion device for burning petroleum coke or gasified waste coke, which can efficiently burn petroleum coke or gasified waste coke, and can ensure that the particles of petroleum coke or gasified waste coke are fully recovered. Combustion and its fly ash capture and cycle combustion, and effectively control SO ₂ and NO _X emissions.

The above-mentioned technical problems of the present invention can be solved by adopting the following technical solutions. Aiming at the characteristics of high ignition temperature of petroleum coke or gasified coke particles, long time required for burning out, flame retardant and poor fluidization performance, the present invention designs a A highly efficient and clean internal mixing combustion device for burning petroleum coke or gasified waste coke includes:

a gas distribution chamber, which has an air inlet pipe, and a gas distribution element is arranged on the top of the gas distribution chamber;

The internal mixing combustion chamber is arranged above the gas distribution element and has a feeder on one side;

The riser is arranged above the internal mixing combustion chamber, and at least one gas-solid quick separator is arranged on the top of the riser;

A silo, the silo is connected to the internal mixing combustion chamber at the lower part through at least one circulating return pipe, the solid phase outlet of the gas-solid quick separator is set in the silo, and an inlet is provided at the lower part of the silo. mouth;

The slag discharge pipe is located below the gas distribution chamber;

Wherein, the internal mixing combustor may include an internal mixing combustor barrel and a flow guiding tube sleeved in the internal mixing combustor barrel. channel; the gas distribution element at the top of the gas distribution chamber has an air inlet corresponding to the guide tube, and is located in the annulus space between the inner wall of the internal mixing combustion chamber cylinder and the outer wall of the guide tube ( That is, the outer ring) is provided with a gas distribution ring, and the air intake in the guide tube (ie the inner ring) is greater than that of the outer ring.

In the present invention, the guide tube is fixed on the bottom of the internal mixing combustion chamber cylinder, and the lower part of the guide tube is provided with a plurality of rectangular slots along the circumference to form the circular flow channel; or there is a gap between the lower end of the guide tube and the bottom of the internal mixing combustion chamber, and the gap is formed as the circulation channel.

In the present invention, as an optional embodiment, the cylinder body of the internal mixing combustion chamber may be directly connected to the gas distribution chamber, and the circulation return pipe is connected to the cylinder body of the internal mixing combustion chamber.

As another optional embodiment, the internal mixing combustor may also include a gas-solid premixing section connected between the gas distribution chamber and the internal mixing combustor barrel, And the axial direction corresponds to the guide cylinder, the feeder is arranged on the gas-solid premixing section, and the circulation return pipe is connected to the gas-solid premixing section.

In the present invention, the gas-solid quick separator is connected in series with one or more stages of cyclone separators, and the legs of the cyclone separators are connected to the lower part of the feed bin.

In the present invention, the upper part of the silo may also be correspondingly connected to one or more stages of cyclone separators connected in series, and the legs of the cyclone separators are connected to the lower part of the silo.

In the present invention, the feed bin can be connected above the internal mixing combustor; or the feed bin can be arranged side by side with the internal mixing combustor.

In the present invention, the exhaust pipe of the gas-solid quick separator can be directly connected to the inlet of the cyclone separator. As another optional example, the exhaust pipe of the gas-solid quick separator can also be connected to the upper part of the silo, and the inlet of the cyclone separator is also connected to the upper part of the silo accordingly, so that the gas The exhaust pipe of the solid fast separator communicates with the inlet of the cyclone separator through the upper part of the silo.

In the present invention, an exhaust pipe may be provided on the top of the silo, and the inlet of the cyclone separator is connected to the exhaust pipe. The exhaust pipe of the gas-solid quick separator can be connected to the exhaust pipe of the silo, so as to communicate with the inlet of the cyclone separator through the exhaust pipe of the silo.

In the present invention, a control valve may further be provided on the said circulation return pipe.

In the present invention, two or more quick gas-solid separators are arranged on the top of the riser. There may also be two or more than two said circulation return pipes.

Utilizing the above-mentioned device of the present invention, the staged combustion mode formed by combining the dense-phase circulation mixing section in the bottom internal mixing combustion chamber and the dilute-phase section of the upper riser delivery bed for petroleum coke or gasified waste coke can effectively control NO The formation of _X ; and, the internal mixing combustor based on the principle of gas-solid phase circulation can form the combustion and fixation conditions of petroleum coke or gasified coke particles with strong back-mixing, high concentration and long residence time, while the upper part is high The combustion section of the dilute-phase conveying bed in the riser with high mass transfer rate and heat input intensity can continue to burn unburned petroleum coke or gasified coke particles; in addition, the gas-solid rapid separator at the top can separate the flue Most of the unburned coke particles and wear-resistant heat carriers such as quartz sand carried in the combustion chamber are circulated back to the lower combustion chamber, thus forming the combustion characteristics of the entire combustion system with a high cycle rate.

The advantages of the present invention are: (1) It adopts a new type of combustion equipment combining dense-phase circulation mixing and dilute-phase conveying, which has the characteristics of large operating flexibility, flexible classification mode, low pollutant emission, high combustion and sulfur fixation efficiency, and the like. (2) The use of quartz sand or other circulating heat carriers and fluidization aids is beneficial to the ignition of petroleum coke or gasified waste coke, and is especially helpful for petroleum coke or gasification with small particle size and poor fluidization performance The fluidized combustion of waste coke fine powder can also prevent petroleum coke or gasified waste coke from forming slag in the device, so this device is especially suitable for the combustion of wide-screened petroleum coke and gasified waste coke with small particle size. (3) The uniquely designed gas-solid separation system adopted at the outlet of the device can effectively capture the unburned fine particles, and make them circulate and burn at a large rate in the burner, so that the amount of fly ash carried out is small. (4) The device has a simple and compact structure, occupies a small area, and is easy to implement.

Description of drawings

Fig. 1 is a schematic structural view of Embodiment 1 of an internal mixing combustion device of the present invention;

Fig. 2 is a schematic structural view of Embodiment 2 of the internal mixing combustion device of the present invention;

Fig. 3 is a schematic structural view of Embodiment 3 of the internal mixing combustion device of the present invention;

Fig. 4 is a schematic structural view of Embodiment 4 of the internal mixing combustion device of the present invention;

Fig. 5 is a schematic structural view of Embodiment 5 of the internal mixing combustion device of the present invention.

Detailed ways

As shown in Figures 1-5, the internal mixing combustion device of the present invention includes: a gas distribution chamber 1, which has an air inlet pipe 13, and a gas distribution element 2 is arranged on the top of the gas distribution chamber 1;

The internal mixing combustion chamber is arranged above the gas distribution element (gas distribution plate 2), and a feeder 4 is provided on one side thereof;

A riser 8 is arranged above the internal mixing combustion chamber, and at least one gas-solid quick separator 11 is arranged on the top of the riser 8;

A silo 9, the silo 9 is communicated with the lower internal mixing combustion chamber through at least one circulation return pipe 12, and the solid phase outlet of the gas-solid quick separator 11, that is, the feeding leg, is arranged in the silo 9, And the lower part of the silo 9 is provided with an air inlet for distributing gas to the silo 9 through the gas distribution ring 7;

The slag discharge pipe 14, which is located below the gas distribution chamber 1, is used to discharge the ash and calcium sulfate generated during the combustion process.

Utilizing the above-mentioned internal mixing combustion device, the method for burning petroleum coke or gasified waste coke of the present invention is: combining petroleum coke or gasified waste coke particles with wear-resistant heat carrier particles (such as quartz sand or other heat carriers) and sulfur-fixed agent (such as limestone) is added into an internal mixing combustion chamber and mixed with air to make petroleum coke or gasified residual coke particles combust and remove _SO2 in the flue gas under the action of sulfur fixing agent; make unburned petroleum coke Or gasified residual coke particles enter the riser 8 to continue burning, and then at the outlet of the riser 8, the wear-resistant heat carrier and the fly ash of petroleum coke or the fly ash of gasified residual coke are removed from the flue gas through the gas-solid rapid separator 11 It is quickly separated and collected in the silo 9, and then quickly circulated from the silo 9 to the internal mixing combustion chamber through the circulation return pipe 12 for cyclic combustion.

In this way, the staged combustion mode formed by combining the dense phase circulation mixing section of the bottom internal mixing combustion chamber with the dilute phase section of the upper riser conveying bed for petroleum coke or gasified waste coke can effectively control the formation of _NOx ; and , the internal mixing combustor based on the principle of gas-solid phase circulation can form the combustion sulfur fixation conditions of strong back-mixing, high concentration and long residence time of petroleum coke or gasified coke particles, while the upper part has high mass transfer rate and heat The dilute-phase conveying bed combustion section of the riser 8 with high input strength can continue to burn unburned petroleum coke or gasified residual coke particles; in addition, the gas-solid rapid separator 11 with one or more stages at the top is used, Most of the unburned coke particles and wear-resistant heat carriers such as quartz sand carried in the flue gas can be recycled back to the lower combustion chamber, thus forming the combustion characteristics of the entire combustion system with a high cycle rate.

In the present invention, in order to ensure the complete combustion of the discharged flue gas, as shown in Figure 1-5, the gas-solid quick separator 11 of the internal mixing combustion device can be further connected in series with one or more cyclone separators 10 or 16. The material leg of the cyclone separator 10 or 16 is connected to the lower part of the silo 9, so that the separated flue gas is separated once or more, and the wear-resistant heat carrier and petroleum coke remaining in the flue gas are separated The ash or gasified residual coke fly ash is separated again and collected in the silo 9, and then quickly circulated from the silo 9 back to the internal mixing combustion chamber for cyclic combustion. In the present invention, the upper part of the silo 9 can also be connected to one or more levels of cyclone separators 10 connected in series, and the legs of the cyclone separator 10 are connected to the lower part of the silo 9, so that the material The flue gas at the upper part of the bin 9 is also separated again to further cleanly discharge the flue gas.

In the above method of the present invention, the wear-resistant heat carrier particles mixed with petroleum coke or gasified waste coke have an average particle diameter of 100-150 μm, a particle density of 2200-2600 kg/m ³ , and a specific heat of about 2.0 kJ /kg.℃. Petroleum coke particle size is wide sieve distribution from 0 to 500 μm. The particle size of gasified waste coke is 0-80 μm, the average particle size is 10-30 μm, and the particle density is 1200-1500 kg/m ³ . The sulfur-fixing agent is mixed with petroleum coke or gasified waste coke according to the Ca/S ratio of 1-2 and added into the internal mixing combustion chamber. The light-off temperature in the internal mixing combustion chamber is greater than 600°C. The optimum sulfur fixation temperature for combustion is 860-890°C.

When using the internal mixing type combustion device of the present invention, it should be fed into the device first, and the specific process is: before the device is started, a certain amount of quartz sand (wear-resistant heat carrier) is first added to the device with the feeder 4, The feeding amount is determined according to the specific operating conditions, and then the device is heated and air is supplied to the device, so that the quartz sand particles in the device are in a circulating fluidized state. When the temperature in the device reaches the light-off temperature of petroleum coke (above 600°C), mix the sulfur-fixing agent limestone with petroleum coke or gasified waste coke according to the Ca/S ratio of 1 to 2, and use the feeder 4 according to the specific The feeding rate continuously feeds the fuel into the device, and the fuel enters the state of combustion and sulfur fixation in the device (the combustion temperature in the device is 860-890 ° C), and the device is in a fully started state at this time.

In this process, on the one hand, wear-resistant heat carrier particles (such as quartz sand particles) absorb a large amount of heat released by the combustion of petroleum coke or gasified residual coke in the combustion chamber, and act as a circulating heat carrier to provide petroleum coke or gasified residual coke combustion. The required light-off temperature, on the other hand, acts as a fluidizing agent for petroleum coke or gasified coke fine powder with smaller particle size, so that the fine coke powder can be better fluidized and burned.

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

Example 1

As shown in Figure 1, the internal mixing combustion device of the present embodiment is mainly composed of a gas distribution chamber 1, a gas distribution plate 2, a gas distribution ring 3, 7, a feeder 4, a guide tube 5, and an internal mixing combustion chamber cylinder. Body 6, riser 8, silo 9, cyclone separator 10, 16, gas-solid quick separator 11 at riser outlet, circulation return pipe 12, air inlet pipe 13, slag discharge pipe 14, exhaust pipe 23, 24, and control valve 17 constitutes. In this embodiment, the internal mixing combustor includes an internal mixing combustor barrel 6 and a flow guiding tube 5 sleeved in the internal mixing combustor barrel, and the guiding tube 5 is fixed on the gas distribution plate 2, Arranged concentrically with the cylinder body 6 of the internal mixing combustion chamber, the guide tube 5 divides the internal mixing combustion chamber into two combustion spaces, the inner ring and the outer ring, and the inside of the guide tube 5 is called the inner ring space, and the guide tube 5 The annular gap between the outer wall and the inner wall of the cylinder 6 is called the outer annular space. The lower part of the guide tube 5 is evenly opened with a rectangular slot along the circumference, which serves as a circulation channel for particles to flow from the outer ring to the inner ring.

In the embodiment, the gas distribution plate 2 at the top of the gas distribution chamber 1 has an air inlet corresponding to the guide cylinder 5, and a gas passage is also provided on the internal mixing combustion chamber cylinder 6. The air inlet of distribution ring 7 distributes gas, and the intake air volume in the guide tube 5 (ie the inner ring space) is greater than the intake air volume in the inner mixing type combustor outer ring space. In this way, the amount of air introduced into the inner ring is large, which is the main fluidized air of the burner, so that the granular materials in the inner ring move upward, and the amount of air introduced into the outer ring is small, so that the materials in the outer ring can be fluidized and loosened. Since the air volume of the inner ring is greater than that of the outer ring, the static pressure at the bottom of the inner ring bed is lower than that of the outer ring bed, so the granular material in the outer ring flows downward and passes through the rectangular passage at the bottom of the draft tube 5 Enter the inner ring, so that most of the particles circulate continuously between the inner and outer rings, and the petroleum coke or gasified coke particles form a strong back-mixing in the axial and radial direction of the combustion chamber space, and can be with the Oxygen in the air contacts and burns completely. In the internal mixing combustion chamber, the superficial gas velocity of the inner ring is 1.0-3.7m/s, the superficial gas velocity of the outer ring is about 0.15m/s, and the diameter of the combustion chamber space above the outlet of the draft guide tube 5 becomes larger , the gas velocity is 0.6-1.8m/s.

In this embodiment, as shown in FIG. 1 , a control valve 17 may be provided on the circulation return pipe 12 .

In this embodiment, as shown in Figure 1, the upper end of the internal mixing combustion chamber body 6 is connected to the riser 8, the outlet of the riser 8 is connected to the gas-solid rapid separator 11, and the lower end of the gas-solid rapid separator 11 The material leg (solid phase outlet) is buried below the dense phase material level of the feed bin 9, and the exhaust pipe 24 of the gas-solid quick separator 11 is connected with the inlet of the cyclone separator 16. In this way, the outlet of the internal mixing combustion chamber is connected to the delivery bed of the riser 5, and the unburned petroleum coke or gasified coke particles continue to burn by utilizing its high mass transfer rate and high heat transfer intensity; the riser 5 The superficial gas velocity of the conveying bed is 6.0-12.0m/s, and the particle circulation intensity is 113.5-400kg/m ² .s.

In this embodiment, as shown in Figure 1, the silo 9 is directly connected to the cylinder body 6 of the internal mixing combustion chamber, and an exhaust pipe 23 is provided on the top of the silo 9 to connect with the cyclone separator 10. The material leg of the cyclone separator 10 is connected below the dense phase material level of the silo 9 .

In this embodiment, as shown in Fig. 1, the gas-solid quick separator 11 and the cyclone separators 10, 16 are all arranged outside the silo 9, so that the separator is placed outside to facilitate installation and maintenance.

When the internal mixing combustion device of this embodiment is in use, the specific process is as follows: the air enters the gas distribution chamber 1 through the air inlet pipe 13, and then passes through the gas distribution plate 2 to distribute air evenly in the guide tube 5 (inner ring), and at the same time Another way of air passes through the gas distribution ring 3 and enters the outer ring from the air inlet. The air volume of the inner ring is greater than the air volume of the outer ring, so that the static pressure at the bottom of the outer ring bed is greater than the static pressure at the bottom of the inner ring bed, so by continuous The particles added by the feeder 4 continuously flow into the inner ring from the outer ring through the rectangular channel at the lower part of the draft tube to form a circular flow, so that the petroleum coke or gasified waste coke is circulated and burned in the internal mixing combustion chamber to fix sulfur. While burning in the internal mixed combustion section in the lower part of the device, a part of high-temperature quartz sand particles, unburned petroleum coke or gasified residual coke particles, limestone and the generated flue gas will enter the riser 8 along with the fluidizing air entering from the bottom , unburned petroleum coke or gasified coke particles continue to burn and fix sulfur in the riser. After the gas and solid pass through the riser, they enter the gas-solid quick separator 11 for primary separation, and the separated solid particles enter the silo 9 along the feeding leg of the quick separator; the gas discharged from the exhaust pipe of the quick separator 11 and A small amount of solid particles (basically petroleum coke or fly ash fine powder of gasified residual coke) enter the cyclone separator 16 for secondary separation, and the separated particles enter the material bin 9 along the material leg of the cyclone separator 16; The high-temperature clean flue gas discharged from the exhaust pipes of the devices 10 and 16 can be introduced into the boiler to generate steam or drive the gas turbine to generate electricity. A certain amount of air is introduced into the bottom of the silo 9 through the gas distribution ring 7 to fluidize the high-temperature quartz sand particles and other particles in the silo, and flow into the internal mixing combustion chamber along the circulation return pipe 12 and the control valve 17, so that the The fuel particles added by the feeder 4 are ignited and burned under the high temperature of the quartz sand circulating heat carrier, and the fly ash returned from the feed bin 9 is circulated and reburned in the internal mixing combustion chamber until it is burnt out. The ash and calcium sulfate produced in the combustion process are discharged through the slag discharge pipe 14 .

Example 2

As shown in Figure 2, the internal mixing combustion device of the present embodiment is also mainly composed of a gas distribution chamber 1, a gas distribution plate 2, a gas distribution ring 3, 7, a feeder 4, a flow guide tube 5, and an internal mixing combustion chamber cylinder. Body 6, riser 8, silo 9, cyclone separator 10, gas-solid quick separator 11, circulation return pipe 12, air inlet pipe 13 and slag discharge pipe 14.

The basic structure and working process of this embodiment are the same as those of Embodiment 1, and will not be described in detail here. As shown in Figure 2, the difference in structure between this embodiment and Embodiment 1 is that in this embodiment, there is a certain gap between the lower end of the draft tube 5 and the bottom gas distribution plate 2 as the outer ring particles flow to the inner ring circulation channel.

As shown in Figure 2, in this embodiment, both the gas-solid quick separator 11 and the cyclone separator 10 are built in the silo 9, so that the structure becomes more compact than that of Embodiment 1, and the number of burners is reduced. heat loss in. And, in this embodiment, since both the gas-solid quick separator 11 and the cyclone separator 10 are built in the silo 9, the flue gas discharged from the gas-solid quick separator 11 and the flue gas from the upper part of the silo 9 can pass through Cyclone separator 10 performs re-separation, thereby reducing the use of a set of cyclone separators.

Example 3

As shown in Figure 3, the internal mixing combustion device of this embodiment is mainly composed of a gas distribution chamber 1, a gas distribution plate 2, a gas distribution ring 3, 7, a feeder 4, a guide tube 5, and an internal mixing combustion chamber cylinder 6. Lifting pipe 8, silo 9, cyclone separator 10, gas-solid quick separator 11, circulation return pipe 12, air inlet pipe 13, slag discharge pipe 14, gas-solid premixing section 15 and control valve 17 .

The basic structure and working process of this embodiment are the same as those of Embodiment 2, and will not be described in detail here. As shown in Figure 3, the structural difference between this embodiment and Embodiment 2 is that, in this embodiment, the internal mixing combustion chamber also includes a gas-solid premixing section 15, which is connected to Between the cylinder body 6 of the internal mixing combustion chamber and the gas distribution chamber 1 . In this way, the particles returned by the circulation return pipe 12 first enter the premixing section 15. On the one hand, the fine particles such as fly ash returned from the circulation return pipe are first burned to a certain extent in the premixing section 15, and then enter the upper part. Combustion in the internal mixing combustor, which can greatly prolong the residence time of fine particles and ensure burnout; Sufficient heat exchange and combustion are performed in the mixing section 15, and the residence time of petroleum coke or gasified coke particles at the bottom of the combustion device can be further extended.

Example 4

As shown in Figure 4, the internal mixing combustion device of the present embodiment is mainly composed of gas distribution chambers 1, 22, gas distribution plates 2, 19, gas distribution ring 3, feeder 4, guide tube 5, internal mixing combustion chamber Cylinder 6, riser 8, silo 9, cyclone separator 10, gas-solid quick separator 11, circulation return pipe 12, air inlet pipe 13, slag discharge pipe 14, 21, gas-solid premixing section 15, control Valve 17, exhaust pipe 23,24 and air inlet pipe 20 constitute.

The basic structure and working process of this embodiment are the same as those of Embodiment 3, and will not be described in detail here. As shown in Figure 4, the structural difference between this embodiment and Embodiment 3 is that, in this embodiment, the feed bin 9 is removed from the upper part of the internal mixing combustion chamber, and transported with the internal mixing combustion chamber and the riser 8. The bed combustion sections are arranged side by side, which can increase the storage capacity of particles in the silo 9, make the adjustment range of the cycle rate of the whole device system wider, and make the device more flexible in operation.

In this embodiment, the bottom of the silo 9 is provided with a gas distribution chamber 22 similar to the gas distribution chamber 1, and the bottom of the gas distribution chamber 22 is provided with a gas distribution plate 19 to distribute gas into the silo 9. The gas distribution The chamber 22 is provided with an air inlet pipe 20 through which air is supplied into the gas distribution chamber 22 . A slag discharge pipe 21 may also be provided below the gas distribution chamber 22 .

In an embodiment, the top of the silo 9 may be provided with an exhaust pipe 23 , and the inlet of the cyclone separator 10 is connected to the exhaust pipe 23 . The exhaust pipe 24 of the gas-solid quick separator 11 can be connected to the exhaust pipe 23 of the silo 9 so as to communicate with the inlet of the cyclone separator 10 through the exhaust pipe 23 of the silo 9 .

Example 5

As shown in Figure 5, the internal mixing combustion device of this embodiment is mainly composed of a gas distribution chamber 1, a gas distribution plate 2, a gas distribution ring 3, 7, a feeder 4, a guide tube 5, and an internal mixing combustion chamber cylinder 6. Elevator pipe 8, feed bin 9, cyclone separator 10, gas-solid quick separator 11, circulation return pipe 12, air inlet pipe 13, slag discharge pipe 14 and exhaust pipe 23 at the top of feed bin 9.

The basic structure and working process of this embodiment may be the same as those of Embodiments 1-4, and will not be described in detail here. As shown in Figure 5, the difference between this embodiment and the above-mentioned embodiments 1-4 is that in this embodiment, two gas-solid quick separators 11 can be connected in parallel at the outlet of the riser 8, which can quickly and efficiently realize solid particles and The separation of flue gas reduces the running loss of fly ash and reduces the separation load of the rear cyclone separator. According to needs, there may be more than two gas-solid quick separators 11, which are not shown in the figure.

As shown in Fig. 5, in the present embodiment, the described circulation return pipe 12 can also be provided with two or more than two, only shows the situation of double circulation return pipe 12 in the figure, thus can greatly improve The circulation rate of the device system is high, and the circulation return pipe is built inside the burner, so control valves such as slide valves can be eliminated, making the structure of the device simpler and more compact.

In the above-mentioned embodiments, only the situation of using the first-stage cyclone separator 10 is shown, and the cyclone separator 10 can also be a two-stage or more than two-stage cyclone separator connected in series according to the needs, so as to treat the smoke after combustion. The gas undergoes multi-stage separation cycle combustion, which will not be described in detail here.

The combustion method and internal mixing combustion device of the present invention can not only burn wide-screened petroleum coke and fine gasified waste coke obtained after petroleum coke is gasified in a gasifier, but also can be used to burn coal powder, fly ash fine powder produced by coal-fired boilers, and gasified coke obtained after coal coke powder is gasified in a gasifier. Therefore, the combustion method and internal mixing combustion device of the present invention can not only be operated as a combustion unit alone, but also can be combined with petroleum coke gasifier, coal gasifier, steam boiler or gas turbine to form a polygeneration Combination technology and operation process.

The above embodiments are only used to illustrate the technical solutions of the present invention rather than limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or equivalent Any replacement without departing from the spirit and scope of the technical solutions of the present invention shall be covered by the scope of the claims of the present invention.

Claims (7)

1. An internal mixing combustion device for burning petroleum coke or gasified waste coke, characterized in that the device includes: a gas distribution chamber, which has an air inlet pipe, and a gas distribution element is arranged on the top of the gas distribution chamber; The internal mixing combustion chamber is arranged above the gas distribution element and has a feeder on one side; The riser is arranged above the internal mixing combustion chamber, and at least one stage of gas-solid quick separator is arranged on the top of the riser; A silo, the silo is connected to the internal mixing combustion chamber at the lower part through at least one circulating return pipe, the solid phase outlet of the gas-solid quick separator is set in the silo, and an inlet is provided at the lower part of the silo. mouth; The slag discharge pipe is located below the gas distribution chamber; Wherein, the internal mixing combustor includes an internal mixing combustor cylinder and a guide tube sleeved in the internal mixing combustor cylinder, and a Circulation passage; the gas distribution element at the top of the gas distribution chamber has an air inlet corresponding to the guide tube, and is located in the annular space between the inner wall of the internal mixing combustion chamber cylinder and the outer wall of the guide tube A gas distribution ring is provided, and the intake air volume in the guide tube is greater than the intake air volume in the annular space between the inner wall of the internal mixing combustion chamber cylinder and the outer wall of the guide tube. 2. The internal mixing combustion device for burning petroleum coke or gasified waste coke according to claim 1, characterized in that the guide tube is fixed on the bottom of the internal mixing combustion chamber cylinder, the The lower part of the draft tube is provided with a plurality of rectangular notches along the circumference, forming the circulation channel; or there is a gap between the lower end of the draft tube and the bottom of the internal mixing combustion chamber cylinder, and the gap Formed as the circulation channel. 3. The internal mixing combustion device for burning petroleum coke or gasified waste coke according to claim 1, characterized in that the cylinder body of the internal mixing combustion chamber is directly connected to the gas distribution chamber, and the circulation back The feed pipe is connected to the cylinder of the internal mixing combustion chamber. 4. The internal mixing combustion device for burning petroleum coke or gasified waste coke according to claim 1, characterized in that, the internal mixing combustion chamber also includes a gas-solid premixing section, and the gas-solid premixing section It is connected between the gas distribution chamber and the cylinder body of the internal mixing combustion chamber, and is axially corresponding to the guide tube, the feeder is arranged on the gas-solid premixing section, and the circulation back The feed pipe is connected to the gas-solid premixing section. 5. The internal mixing combustion device for burning petroleum coke or gasified waste coke according to claim 1, characterized in that a control valve is provided on the circulating return pipe. 6. The internal mixing combustion device for burning petroleum coke or gasified waste coke according to claim 1, characterized in that, the gas-solid rapid separator is connected in series with one or more cyclone separators, and the cyclone separates The material leg of the device is connected to the lower part of the silo. 7. The internal mixing combustion device for burning petroleum coke or gasified waste coke according to claim 1, characterized in that there are two or more than two circulation return pipes.

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