CN111440639A - Powder slurry coupling type gasification burner - Google Patents

Abstract

The invention relates to a gasifier burner, in particular to a slurry coupling type gasification burner. It includes a coal-water slurry conveying part located in the center, and a coal-water slurry atomization reaction zone is formed below the coal-water slurry conveying part. The gasification agent sprayed from the outer epoxy channel mixes with the pulverized coal sprayed from the pulverized coal channel to form a pulverized coal dispersion reaction zone. The pulverized coal dispersion reaction zone is located in the coal water slurry atomization reaction zone. outer ring. In this application, the coal-water slurry atomization reaction zone is located in the middle of the gasifier, and the pulverized coal dispersion reaction zone is located at the outer periphery of the coal-water slurry atomization reaction zone, thereby effectively realizing the coal-water slurry atomization reaction zone and the powdered coal. Coal dispersion reaction zones exist at the same time, and this arrangement achieves maximum utilization of the internal space of the gasifier.

Description

Slurry coupled gasification burner

technical field

The invention relates to a gasifier burner, in particular to a slurry coupling type gasification burner.

Background technique

The efficient and clean utilization of coal is a strategic choice for the sustainable development of my country's economy and society, especially the chemical technologies such as coal-to-methanol, coal-to-ethylene glycol, and coal-to-oil based on coal gasification, which are the guarantee of my country's bulk basic chemical products. and an important scientific and technological basis for stable and reliable energy supply and sustainable development. The transformation and utilization based on coal gasification not only reduces the pollution caused by direct combustion, but also the extended coal deep processing industry increases the added value of coal and safeguards my country's energy development strategy, which has become an important development direction. Coal gasification is a process in which coal and gasification agents act to carry out various chemical reactions under specific conditions to generate syngas.

The slurry gasification burner mainly injects pulverized coal, coal-water slurry and gasification agent into the gasifier at the same time through a multi-channel combination and chemical reaction occurs. However, the existing slurry gasification burners all adopt the method of mixing pulverized coal and atomized coal-water slurry in the nozzle setting, and this method mainly has three problems:

1. Due to the special requirements of pulverized coal transportation, the pulverized coal mixture injected into the gasifier contains about 80% carbon dioxide gas. The coal mixture is sprayed to the atomization area at a certain angle, because the carbon dioxide gas flow will suppress the atomized coal water slurry particles to further disperse, thereby affecting the atomization of the coal water slurry. Therefore, the existing slurry gasification burner will not only reduce the atomization effect of the coal-water slurry, but also further aggregate the atomized particles, so that the combustion and gasification reactions only occur in local locations, the furnace space is not effectively utilized, and the carbon conversion rate is relatively high. Low.

2. The coal water slurry is atomized into tiny particles and evenly dispersed on the upper side of the furnace. If the injected pulverized coal is mixed with the atomized coal water slurry particles at a certain cut angle, the pulverized coal particles will be mixed with the atomized coal water slurry. Slurry particles collide. Since most of the volume of atomized particles is water, which has an adsorption effect on solid particles, the pulverized coal particles collide with the atomized CWS particles and aggregate to become larger CWS particles, which further reduces the reaction. speed.

3. The existing coupled burner multi-channel gasification agent is quickly mixed after entering the gasifier, and does not play the role of independent proportioning and separation, and the independent adjustment of the gasification dose of each channel is of little significance.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned existing deficiencies, the purpose of the present invention is to provide a slurry coupling type gasification burner with zone reaction in the gasifier, independent control of pulverized coal and coal-water slurry, aiming at at least solving the problem of existing slurry gas The atomization effect of the burner is poor, the mixing of the slurry makes the reaction materials too concentrated, the furnace space cannot be effectively used, the reaction speed is reduced, and the carbon conversion rate is low.

In order to achieve the above object, the present invention adopts the following technical solutions:

A slurry coupling type gasification burner, comprising a coal-water slurry conveying part located in the center, a coal-water slurry atomization reaction zone is formed below the coal-water slurry conveying part, and an outer ring of the coal-water slurry conveying part is also provided with a The pulverized coal channel of pulverized coal and the outer epoxy channel for conveying gasification agent, the gasification agent sprayed from the outer epoxy channel is mixed with the pulverized coal sprayed from the pulverized coal channel to form a pulverized coal dispersion reaction zone, and the pulverized coal is dispersed. The reaction zone is located in the outer circle of the coal-water slurry atomization reaction zone.

Optionally, a flow guide is provided at the outlet of the outer epoxy channel, and the flow guide is used to adjust the outlet direction of the gasification agent so that the gasification agent drives the pulverized coal to move away from the coal-water slurry atomization reaction zone.

Optionally, the guide portion includes a plurality of guide fins distributed at the outlet of the outer epoxy channel along the circumferential direction, and the guide fins are inclined in the circumferential direction of the outer epoxy channel.

Optionally, the outer ring of the coal-water slurry conveying part is sequentially provided with an outer epoxy channel and a pulverized coal channel from the inside to the outside, the outlet of the pulverized coal channel is inclined inwardly, and the outlet of the outer epoxy channel is vertically arranged.

Optionally, the half cone angle of the outlet of the pulverized coal channel is a1, the inclination angle of the guide vane relative to the vertical direction is a2, and a2-a1>0° is satisfied between a1 and a2.

Optionally, the outer ring of the pulverized coal channel is provided with a cooling water channel.

Optionally, the outer ring of the coal-water slurry conveying part is sequentially provided with a pulverized coal channel and an outer epoxy channel from the inside to the outside, the outlet of the outer epoxy channel is inclined inwardly, and the outlet of the pulverized coal channel is vertically arranged.

Optionally, the half cone angle of the outlet of the outer epoxy channel is a3, the inclination angle of the guide vane relative to the vertical direction is a4, and a4-a3>0° is satisfied between a3 and a4.

Optionally, a cooling water channel is provided between the pulverized coal channel and the coal-water slurry conveying part, and a refractory layer is provided on the outer side of the outer epoxy channel.

Optionally, the width of the annular surface where the outer epoxy channel is located is L1. In the horizontal direction, the installation position of the guide plate in the outer epoxy channel is higher than the height of the outlet of the pulverized coal channel by H2, and the distance between H2 and L1 satisfies L1≤ H2≤L1/tan(a3).

Optionally, the coal-water slurry conveying part includes an inner epoxy channel, a coal-water slurry channel and a middle epoxy channel which are sequentially arranged from the inside to the outside.

Beneficial effects: In this application, the coal-water slurry atomization reaction zone is located just below the outlet of the gasifier burner, and the pulverized coal dispersion reaction zone is located at the outer periphery of the coal-water slurry atomization reaction zone, thereby effectively realizing the The slurry atomization reaction zone and the pulverized coal dispersion reaction zone coexist, and this arrangement realizes the maximum utilization of the internal space of the gasifier. Moreover, the present invention can effectively avoid the occurrence of the pulverized coal mixture affecting the atomization of the coal water slurry, and the interaction between the pulverized coal mixture and the atomized coal water slurry particles by partitioning the coal water slurry atomization reaction zone and the pulverized coal dispersion reaction zone. Adsorption polymerization and the problem that the amount of gasification in each channel cannot be independently adjusted, so that the partition reaction can be carried out efficiently.

Description of drawings

1 is a schematic structural diagram of one of the layout forms of the present invention;

Fig. 2 is the structural schematic diagram of another arrangement form of the present invention;

Fig. 3 is the partition schematic diagram of the pulverized coal dispersion reaction zone and the coal-water slurry atomization reaction zone of the present invention;

FIG. 4 is a schematic diagram of the arrangement of one of the air guides and the guide vanes of the present invention;

FIG. 5 is a schematic diagram of the arrangement of another air guide portion and its guide fins according to the present invention.

Reference number:

1. Coal water slurry atomization reaction zone; 2. Pulverized coal channel; 3. Outer epoxy channel; 4. Pulverized coal dispersion reaction zone; , refractory layer; 8, inner epoxy channel; 9, coal water slurry channel; 10, middle epoxy channel.

Detailed ways

In order to understand the above objects, features and advantages of the present invention more clearly, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the described embodiments are some, but not all, embodiments of the present invention. The specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art fall within the protection scope of the present invention.

Referring to FIG. 1 or FIG. 2 , a slurry-coupling gasification burner provided by an embodiment of the present invention includes a coal-water slurry conveying part located in the center, and a coal-water slurry atomization reaction zone is formed below the coal-water slurry conveying part 1. The outside of the coal-water slurry conveying part is also provided with a pulverized coal channel 2 for transporting pulverized coal and an outer epoxy channel 3 for transporting gasification agent. The pulverized coal ejected from the channel 2 is mixed to form the pulverized coal dispersion reaction zone 4. The pulverized coal dispersion reaction zone 4 is located in the outer ring of the coal-water slurry atomization reaction zone 1. In reality, there is no absolute boundary between the inner and outer rings in gasification. The inner side is the coal-water slurry reaction area, the outer side is the pulverized coal reaction area, and there will be an intersection area, which will not be emphasized here.

In the prior art, the coal-water slurry conveying part can be composed of an inner epoxy channel 8, a coal-water slurry channel 9 and a middle epoxy channel 10 which are arranged in sequence from the inside to the outside. In the specific implementation process, the bottom of the middle epoxy channel 10 is used. The position of the end height is the end face of the head of the burner, and the distance between the top of the head of the inner epoxy channel 8 and the end of the head is D1, where 40≤D1≤80mm; the position of the top of the head of the coal-water slurry channel 9 is far from the head The distance between the end faces is D2, where 2≤D2≤8mm; and the top of the head of the coal-water slurry channel 9 is communicated with the top of the head of the inner epoxy channel 8 to form a premixing cavity, and the coal-water slurry is surrounded by a ring in the premixing cavity. The gasification agent transported by the oxygen channel is initially atomized, and then the mixture in the premix chamber is atomized for the second time under the action of high-speed impact and shearing of the gasification agent sprayed from the middle epoxy channel 10. After the mixture is atomized, It dries quickly in a high temperature environment, and precipitates volatile components. At the same time, the atomized particles in the mixture are fully mixed with the gasification agent, and the combustion and gasification reaction can occur rapidly, so the coal water slurry atomization reaction zone 1 is formed in the area below it.

In this scheme, an outer channel for conveying pulverized coal and gasification agent is set outside the coal-water slurry conveying part, that is, a pulverized coal channel 2 and an outer epoxy channel 3 are set, which are used to provide gasification in the actual production process. The pipeline of the agent generally has a large flow rate, and its flow rate is generally several times that of the pulverized coal channel 2. Therefore, the gasification agent provided by the outer epoxy channel 3 can effectively mix with the pulverized coal and directionally disperse the pulverized coal, thereby A pulverized coal dispersion reaction zone 4 is formed on the outer ring of the coal-water slurry atomization reaction zone 1 .

In this solution, the inner epoxy channel 8, the middle epoxy channel 10 and the outer epoxy channel 3 are used to feed gasification agent into the gasifier. The type of gasification agent is not limited to oxygen, but also includes water and coal that can support combustion Slurry, pulverized coal combustion and other gases.

According to the above description, the coal-water slurry atomization reaction zone 1 and the pulverized coal dispersion reaction zone 4 can exist in the gasifier at the same time. According to the selection of different shapes of burners, different shapes of coal-water slurry atomization reaction zones will be generated. 1 and the pulverized coal dispersion reaction zone 4, for example, if the burner has a circular structure, correspondingly, the coal-water slurry atomization reaction zone 1 has a circular structure, and the pulverized coal dispersion reaction zone 4 has a ring structure, please refer to image 3.

Cut the coal water slurry atomization reaction zone 1 and the pulverized coal dispersion reaction zone 4 along the horizontal direction, please refer to Figure 3, the coal water slurry atomization reaction zone 1 is located in the middle of the gasifier, and the pulverized coal dispersion reaction zone 4 is located in the water The outer circumference of the coal slurry atomization reaction zone 1 effectively realizes the coexistence of the coal water slurry atomization reaction zone 1 and the pulverized coal dispersion reaction zone 4, and this arrangement can maximize the use of the internal space of the gasifier , to avoid the waste of the internal space of the gasifier.

By partitioning the coal-water slurry atomization reaction zone 1 and the pulverized coal dispersion reaction zone 4, it is also possible to effectively avoid the occurrence of the influence of the pulverized coal mixture on the atomization of the coal-water slurry, the pulverized coal mixture and the post-atomization, as mentioned in the background art. The problems of mutual adsorption and polymerization between the coal-water slurry particles and the inability to adjust the gasification dose of each channel independently, finally achieve the effect of making the coal-water slurry atomization reaction zone 1 and the pulverized coal dispersion reaction zone 4 achieve high-efficiency reactions.

For the determination of the size of the area where the coal-water slurry atomization reaction zone 1 is located, the size of the area where the pulverized coal dispersion reaction zone 4 is located, and the distance between the two, it can be achieved by those skilled in the art by debugging each component, so as to be able to The above partition effect shall prevail.

For example, those skilled in the art can adjust the outlet directions of the outer epoxy channel 3 and the pulverized coal channel 2 so that the outlet directions of the two internal materials intersect, so as to realize mixing. The direction of the gasification agent sprayed from the large outer epoxy channel 3 is relatively consistent. Therefore, those skilled in the art can adjust the outlet direction of the outer epoxy channel 3 according to the scope of the coal-water slurry atomization reaction zone 1, so as to change the final direction. The pulverized coal dispersion reaction zone 4 composed of mixed materials is located in the outer circle of the coal-water slurry atomization reaction zone 1 .

Those skilled in the art can also set a common annular discharge nozzle for the outlet of the outer epoxy channel 3 and the pulverized coal channel 2 to premix the gasification agent and the pulverized coal and spray them together, and adjust the outlet The injection angle of the feed nozzle, so that the pulverized coal dispersion reaction zone 4 and the coal-water slurry atomization reaction zone 1 do not overlap.

Since when the materials are mixed, the main direction of the mixed material is consistent with the direction of the gasification agent sprayed from the outer epoxy channel 3 with a larger flow rate, so those skilled in the art can also set a separate outer epoxy channel 3 that can be used for Guided discharge nozzle, so as to guide the gasification agent sprayed from the outer epoxy channel 3, so that the gasification agent and pulverized coal are mixed and the mixture moves to the outer ring of the coal-water slurry atomization reaction zone 1 to form pulverized coal Dispersion reaction zone 4.

This scheme mainly protects the concept of partitioning the coal-water slurry atomization reaction zone 1 and the pulverized coal dispersion reaction zone 4 in the gasifier. The specific improvement structure of the burner made by those skilled in the art according to this concept is all Within the protection scope of the present application, the above description of the pulverized coal dispersion reaction zone 4 is only used to illustrate the technical solution of the present invention, but not to limit it.

Please refer to FIG. 1 or FIG. 2 , a guide part 5 is provided at the outlet of the outer epoxy channel 3 , and the guide part 5 is used to adjust the outlet direction of the gasification agent so that the gasification agent drives the pulverized coal away from the coal-water slurry mist the direction of the chemical reaction zone 1.

This scheme is a further disclosure of the structure of the outer epoxy channel 3. Since the gasification agent has a large flow rate, after it is mixed with pulverized coal, the movement direction of the gasification agent is the decisive factor to determine the movement direction of the mixture. Therefore, in this scheme There is a guide part that can guide the movement direction of the gasification agent, and the movement direction of the gasification agent is changed by the guide part, so as to guide the direction of the mixture mixed with the gasification agent and the pulverized coal, so that the Move to the direction away from the coal-water slurry atomization reaction zone 1, and form a pulverized coal dispersion reaction zone 4 in the outer circle of the coal-water slurry atomization reaction zone 1.

The guide structure for the gas is relatively conventional. Since the outer epoxy channel 3 is annular, the guide portion can be a plurality of annular guide pieces arranged in the outer epoxy channel 3 in turn and coaxial with it. The annular guide piece is similar to The side surface of the truncated cone is inclined, so that the gasification agent can be effectively guided to a position away from the coal-water slurry atomization reaction zone 1 .

The guide part can also be a ring with a guide hole, the ring is coaxially clamped into the outlet of the outer epoxy channel 3, and there are oblique guide holes evenly distributed on it, so as to also play the role of guiding the gasification agent. The function of guiding to the position away from the coal-water slurry atomization reaction zone 1.

The guide portion can also be a guide plate 51 and the like which are uniformly distributed at the outlet of the outer epoxy channel 3 along the circumferential direction and are arranged obliquely.

Referring to FIG. 4 or FIG. 5 , the guide portion 5 includes a plurality of guide fins 51 distributed at the outlet of the outer epoxy channel 3 along the circumferential direction, and the guide fins 51 are inclined in the circumferential direction of the outer epoxy channel 3 .

This solution is a further disclosure of the structure of the guide portion, that is, the guide portion 5 includes guide fins 51 that are uniformly distributed at the outlet of the outer epoxy channel 3 in the circumferential direction and are arranged obliquely. The structure of the sheet, while effectively guiding the gasification agent, also has the effect of making the flow guiding effect better. Due to the setting of the guiding sheet 51, a swirling effect can be formed on the gasification agent. When the gasification agent is After the deflector 51 is ejected from the outer epoxy channel 3, the center of the epoxy channel 3 outside the gasification agent is not guided to the circumferential direction, that is, it is not guided in the radial direction. If it is guided in the radial direction, The flow direction of the gasification agent will directly intersect with the flow direction of the pulverized coal, and the change trend of the distance between the movement trajectory of the gasification agent and the area formed by the pulverized coal is large. However, the actual contact range between the gasification agent and the pulverized coal is still small during the crossing process, which leads to the inability to achieve the optimal mixing effect to a certain extent. And if it is guided in the radial direction, due to the fast gas velocity and the limited space at the top of the gasifier, the pulverized coal and gasification agent will directly contact the gasifier furnace wall, causing local overheating of the gasifier, thus affecting the reaction effect.

However, by setting the guide vane 51, the gasification agent is sprayed out in the tangential direction of the outer epoxy channel 3, so the contact between the gasification agent and the pulverized coal does not directly intersect, but tangentially with the pulverized coal. Therefore, the change trend of the distance between the movement trajectory of the gasification agent and the area formed by the pulverized coal is small, which is conducive to the full contact between the gasification agent and the pulverized coal, and there is a certain degree of contact between the gasification agent and the pulverized coal. Buffer process, so that the guiding effect of gasification agent on pulverized coal is better.

Please refer to Figure 1, the outer ring of the coal-water slurry conveying part is provided with an outer epoxy channel 3 and a pulverized coal channel 2 from the inside to the outside, the outlet of the pulverized coal channel 2 is inclined inward, and the outlet of the outer epoxy channel 3 is vertical set up.

This solution is a further disclosure of the specific arrangement structure of the pulverized coal channel 2 and the outer epoxy channel 3, and is the first arrangement. At this time, the distance between the outer epoxy channel 3 and the coal-water slurry conveying part is relatively short. If the outlet of the outer epoxy channel 3 is inclined to the inside, the atomization reaction zone 1 of the gasification agent and the coal-water slurry will appear to a large extent. Therefore, the outlet of the outer epoxy channel 3 should not face the inside as far as possible, and the outlet of the outer epoxy channel 3 should be at least vertical or facing the outside. It rotates out and moves in the direction away from the coal-water slurry atomization reaction zone 1. Therefore, the outlet of the outer epoxy channel 3 is arranged vertically.

Correspondingly, in order to effectively mix the pulverized coal and the gasification agent, the outlet of the pulverized coal passage 2 is inclined inwardly. The distance between the movement trajectory of the gasification agent and the coal-water slurry atomization reaction zone 1 can be reduced to the greatest extent, and at the same time, the two will not overlap, so that the pulverized coal dispersion reaction zone 4 and the coal-water slurry atomization reaction zone 1 can be separated to the greatest extent. The partitions are optimized to the greatest extent, so as to maximize the use of the internal space of the gasifier.

In this solution, the outlet of the outer epoxy channel 3 is arranged vertically, so its outlet is a conventional annular structure, please refer to FIG. In the mode of integral processing, the integral component includes an outer cylinder and an inner cylinder, and the guide fin 51 is welded between the outer cylinder and the inner cylinder according to the design size, and then the annular ring composed of the outer cylinder, the inner cylinder and the guide fin 51 is welded. The structure can be installed into the outlet of the outer epoxy channel 3. The blade height of the guide vane 51 is h, the distance between the bottom end of the guide vane 51 and the end face of the head is H1, and the relationship between h and H1 satisfies H1≤2h; Clockwise or counterclockwise available. In order to avoid the problem that the pulverized coal dispersion reaction zone 4 and the coal-water slurry atomization reaction zone 1 overlap due to the close distance between the outer epoxy channel 3 and the coal-water slurry conveying part, those skilled in the art should set the outer ring according to the actual production requirements. The distance between the oxygen channel 3 and the outlet of the coal-water slurry conveying part.

1 and 4, the half cone angle of the outlet of the pulverized coal passage 2 is a1, the inclination angle of the guide vane 51 relative to the vertical direction is a2, and a2-a1>0° is satisfied between a1 and a2.

When a2-a1=0°, the flow direction of the gasification agent tends to be consistent with the flow direction of pulverized coal, and the overall flow trend after mixing the two tends to be linear. When a2-a1>0°, the gasification agent Compared with the pulverized coal, the flow trend of the pulverized coal is larger. The operator can increase the flow rate of the pulverized coal according to the experiment to strengthen the impact of the pulverized coal on the gasification agent. Under the resistance of the gasification agent and the impact of the gas in the pulverized coal channel 2, after the pulverized coal is mixed with the gasification agent, its motion trajectory tends to a curve, and the derivative value of the curve is bottom-up, inside-out Gradually decreasing, as shown in Fig. 1, the advantage of the mixture in a curved trajectory is that the distance between the pulverized coal dispersion reaction zone 4 and the coal-water slurry atomization reaction zone 1 can be reduced, so that the internal space of the gasifier can be used more effectively, so that the gasification React more efficiently.

Preferably, a1 satisfies 10°≤a1≤45°, and a full 5°≤a2-a1≤25° between a1 and a2. The structure of this setting is scientific, reasonable and efficient, and can make better use of the upper space in the furnace on the premise that the pulverized coal and gasification agent do not contact the furnace wall, otherwise the pulverized coal reaction zone will be relatively lower, which is not conducive to the reaction with the coal-water slurry division of the district.

The outer ring of the pulverized coal channel 2 is provided with a cooling water channel 6 .

In this scheme, the cooling water channel 6 is mainly used for cooling. In the actual production process, the water content in the pulverized coal is less, so the flame burning is closer to the end face of the head, and the inner side of the pulverized coal channel 2 can pass through the outer epoxy channel In order to protect the outlet of the pulverized coal channel 2 from being destroyed by flame combustion, the cooling water channel 6 needs to be set on the outside of the gasification agent in high-speed circulation in 3, so that the pulverized coal channel 2 and its outlet can be fully cleaned. Cool down.

Please refer to Figure 2, the outer ring of the coal-water slurry conveying part is provided with a pulverized coal channel 2 and an outer epoxy channel 3 from the inside to the outside, the outlet of the outer epoxy channel 3 is inclined inward, and the outlet of the pulverized coal channel 2 is vertical set up.

This scheme is a further disclosure of the specific arrangement structure of the pulverized coal channel 2 and the outer epoxy channel 3, which is the second arrangement. In the case where the gasification agent does not overlap with the coal-water slurry atomization reaction zone 1, the outlet of the outer epoxy channel 3 is inclined to the inside, which can effectively reduce the gap between the gasification agent and the coal-water slurry atomization reaction zone 1. Therefore, the internal space of the gasifier can be efficiently utilized, taking into account the mixing of gasification agent and pulverized coal and reducing the distance between the pulverized coal dispersion reaction zone 4 formed by the mixture and the coal-water slurry atomization reaction zone 1, the pulverized coal channel The exit direction of 2 is set vertically.

In this solution, the outlet of the outer epoxy channel 3 is arranged obliquely, so the shape of the outlet is relatively special. It is a ring-like structure composed of two coaxial circular truncated sides. The deflector 51 can be directly welded to the outer epoxy channel. 3. In the outlet, please refer to Figure 5. The integral processing mode can also be selected. The integral component includes an outer cylinder and an inner cylinder. The outer cylinder and the inner cylinder are coaxial circular truncated side structures. The guide vane 51 is designed according to the design. The size is welded between the outer cylinder and the inner cylinder, and then the annular structure composed of the outer cylinder, the inner cylinder and the guide plate 51 can be installed into the outlet of the outer epoxy channel 3 . The guide vanes 51 are arranged obliquely, and the inclination direction may be clockwise or counterclockwise.

Preferably, the inner side of the outlet of the pulverized coal channel 2 is vertical, and the outer side thereof is slightly shrunk inwardly corresponding to the outer epoxy channel 3 . The inwardly inclined setting of the outlet of the outer epoxy channel 3 is to use the inclined angle to make more effective contact with the pulverized coal material, premix with the pulverized coal and carry the pulverized coal away from the burner outlet. There is a contraction on the outside of the outlet of the pulverized coal passage 2, which can speed up the outlet speed of the pulverized coal, and the momentum after contact with the gasification agent is larger, thereby effectively improving the reaction efficiency.

2 and 5, the half cone angle of the outlet of the outer epoxy channel 3 is a3, the inclination angle of the guide vane 51 relative to the vertical direction is a4, and a4-a3>0° is satisfied between a3 and a4.

In the same way, the relationship between the angle of the outlet direction of the external epoxy channel 3 and the angle of the guide vane 51 is also that the trajectory of the mixed pulverized coal and the gasification agent tends to a curve, and the curve structure is similar to that in the first arrangement. The formed curve can reduce the distance between the pulverized coal dispersion reaction zone 4 and the coal-water slurry atomization reaction zone 1, so that the internal space of the gasifier can be more effectively used, and the gasification reaction is more efficient.

Preferably, a3 satisfies 5°≤a3≤15°, and the relationship between a3 and a4 satisfies 5°≤a4-a3≤30°. The outlet angle of the outer epoxy channel 3 is a conventional choice, and the structure is scientific, reasonable and efficient.

A cooling water channel 6 is provided between the pulverized coal channel 2 and the coal-water slurry conveying part, and a refractory layer 7 is provided on the outer side of the outer epoxy channel 3 .

Similar to the first arrangement structure, the cooling water channel 6 and the refractory layer 7 are arranged in the second arrangement, which will not be repeated here. Secondly, in order to avoid the problem that the pulverized coal dispersion reaction zone 4 and the coal-water slurry atomization reaction zone 1 are overlapped due to the close distance between the outer epoxy channel 3 and the coal-water slurry conveying part, those skilled in the art should set according to actual production requirements. The distance between the outer epoxy channel 3 and the outlet of the coal-water slurry conveying part can be realized by the width of the cooling water channel 6 . The width of the annular surface where the outer epoxy channel 3 is located is L1. In the horizontal direction, the installation position of the guide plate 51 in the outer epoxy channel 3 is higher than the height of the outlet of the pulverized coal channel 2 by H2, and L1 is satisfied between H2 and L1. ≤H2≤L1/tan(a3).

In this solution, the outlet of the outer epoxy channel 3 is inclined inwardly, so the oxidant sprayed from it will first move to the inner side, that is, the coal-water slurry atomization reaction zone 1, to form the first stroke, and then in the guide plate 51 Under the swirl effect, continue to move to the outside to form the second stroke. The first stroke and the second stroke constitute the total stroke. The connection point between the first stroke and the second stroke is the inflection point, which specifically means the total stroke. There is a "turn" in the stroke at this point, see Figure 2.

In this solution, by setting the above parameters, the position of the inflection point can be roughly located at the end face of the head, so that the first stroke can be mainly located at the outlet of the pulverized coal passage 2 and the outer epoxy passage 3, which can avoid the end of the first stroke. The distance from the coal-water slurry atomization reaction zone 1 is close, which leads to the problem of the two overlapping, and the second stroke starts from the end face of the head, and on the basis of the above, the second stroke and the coal-water slurry atomization reaction can be minimized as much as possible. The distance between the zone 1 means reducing the distance between the pulverized coal dispersion reaction zone 4 and the coal-water slurry atomization reaction zone 1, so that the internal space of the gasifier is more effectively used, and the gasification reaction is more efficient.

Preferably, a3+a4≤45° is satisfied between a3 and a4, the above setting can be matched with the outer wall of the outlet of the cooling water channel 6, and the gasification agent adjusts the movement direction through the two angles of a3 and a4, so that its stroke reaches a suitable Then, it is mixed with pulverized coal, and under the shielding of the outer wall of the outlet of the cooling water channel 6, it has the effect of changing the movement direction of the mixture, so that it moves to the outside of the coal-water slurry atomization reaction zone 1.

The coal-water slurry conveying part includes an inner epoxy channel 8 , a coal-water slurry channel 9 and a middle epoxy channel 10 which are sequentially arranged from the inside to the outside.

This scheme discloses the specific structure of the coal-water slurry conveying part.

When the burner is running, the inner epoxy channel 8 and the middle epoxy channel 10 meet the needs of coal-water slurry atomization and reaction. The amount of inner epoxy accounts for 12-18% of the total oxygen required by the coal-water slurry. The specific value depends on the size of the nozzle. Calculation; the amount of external epoxy meets the needs of pulverized coal reaction. The amount of inner epoxy and middle epoxy is automatically adjusted according to the flow rate of CWS, and the amount of outer epoxy is automatically adjusted according to the flow rate of pulverized coal, and the oxygen-to-coal ratio of the coal-water slurry passage and the oxygen-to-coal ratio of the pulverized coal passage need to adopt different oxygen-to-coal ratios , the value should be comprehensively calculated according to coal type, reaction conditions, etc., in order to meet the requirements of complete gasification reaction of coal-water slurry and pulverized coal as the standard.

When the burner is running, the inner epoxy channel 8 and the middle epoxy channel 10 are the gasification agent sprayed. First, the coal-water slurry is atomized, and the mixture of atomized particles and gasification agent is distributed in the center position, and it dries quickly in a high temperature environment. And the volatile matter is precipitated. Due to the sufficient mixing with the gasification agent, the combustion and gasification reaction occurs rapidly, and the coal-water slurry atomization reaction zone 1 is formed under the end face of the head. The outer epoxy channel 3 is first guided through the guide plate 51, spreads around at a certain swirl angle, and is mixed with pulverized coal at the spout. The gasification agent drives the pulverized coal to diffuse and move around. After entering the furnace, it is instantly dried and volatiles are precipitated. Since the pulverized coal is completely mixed with the gasification agent, the combustion and gasification reaction occurs rapidly, and the coal water slurry can be atomized outside the reaction zone 1. The ring forms an annular pulverized coal dispersion reaction zone 4 . The two main reaction areas are independent of each other and have the ability to adjust independently. The two reaction areas will not overlap within the range of coal input load variation. The atomization and reaction of coal-water slurry are not affected by pulverized coal, and the atomization effect is good. The double reaction zone maximizes the use of the furnace reaction space to improve the carbon conversion rate of the gasifier.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (11)

1. The utility model provides a whitewashed slurry manifold type gasification nozzle, is including the coal slurry conveying part that is located the center, the lower square coal slurry atomization reaction zone of coal slurry conveying part, its characterized in that, the outer lane of coal slurry conveying part still is equipped with the outer epoxy passageway that is used for carrying the fine coal passageway of fine coal and is used for carrying the gasification agent, outer epoxy passageway spun gasification agent with fine coal passageway spun fine coal mixes and forms fine coal dispersion reaction zone, fine coal dispersion reaction zone is located the outer lane in coal slurry atomization reaction zone.

2. The slip coupled gasification burner of claim 1, wherein a flow guide portion is disposed at an outlet of the outer epoxy passage, and the flow guide portion is configured to adjust an outlet direction of a gasifying agent so that the gasifying agent drives pulverized coal to move in a direction away from the coal water slurry atomization reaction zone.

3. The slip coupled gasification burner of claim 2, wherein the flow guide portion comprises a plurality of flow guide vanes circumferentially distributed at the outlet of the outer oxygen passage, and the flow guide vanes are inclined toward the outer oxygen passage in the circumferential direction.

4. The pulverized coal slurry coupled gasification burner as claimed in claim 3, wherein the outer ring of the coal water slurry conveying part is provided with the outer epoxy channel and the pulverized coal channel from inside to outside in sequence, the outlet of the pulverized coal channel is inclined inwards, and the outlet of the outer epoxy channel is vertical.

5. The slip-coupled gasification burner of claim 4, wherein the half cone angle of the pulverized coal channel outlet is a1, the angle of inclination of the deflector relative to the vertical direction is a2, and a2-a1 is more than 0 ° between a1 and a 2.

6. The slip coupled gasification burner of claim 4 or 5, wherein a cooling water channel is provided at an outer periphery of the pulverized coal channel.

7. The pulverized coal slurry coupled gasification burner as claimed in claim 3, wherein the pulverized coal channel and the outer epoxy channel are sequentially arranged on the outer ring of the coal water slurry conveying part from inside to outside, the outlet of the outer epoxy channel is inclined inwards, and the outlet of the pulverized coal channel is vertical.

8. The slurry coupling gasification burner of claim 7, wherein the half cone angle of the outlet of the outer epoxy passage is a3, the angle of inclination of the deflector with respect to the vertical direction is a4, and a4-a3 is more than 0 ° between a3 and a 4.

9. The slurry coupled gasification burner nozzle according to claim 7 or 8, wherein a cooling water channel is arranged between the pulverized coal channel and the coal water slurry conveying part, and a fire-resistant layer is arranged outside the outer oxygen channel.

10. The slip coupled gasification burner of claim 7, wherein the width of an annulus where the outer epoxy passage is located is L1, the height of the installation position of the deflector in the outer epoxy passage higher than the outlet of the pulverized coal passage in the horizontal direction is H2, and the distance between H2 and L1 is L1 < H2 < L1/tan (a 3).

11. The slip coupled gasification burner of claim 1, wherein the coal-water slurry delivery portion comprises an inner epoxy passage, a coal-water slurry passage and an intermediate epoxy passage which are sequentially arranged from inside to outside.

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