CN111621337A

CN111621337A - Novel burner feeding distribution system

Info

Publication number: CN111621337A
Application number: CN201910152826.2A
Authority: CN
Inventors: 曾宪松; 庞睿; 赵国忠; 王令光; 杨德兴; 阎红; 冯亮杰; 孙志刚; 柳杨; 曹孟常
Original assignee: China Petroleum and Chemical Corp; Sinopec Ningbo Engineering Co Ltd; Sinopec Ningbo Technology Research Institute
Current assignee: China Petroleum and Chemical Corp; Sinopec Ningbo Engineering Co Ltd; Sinopec Ningbo Technology Research Institute
Priority date: 2019-02-28
Filing date: 2019-02-28
Publication date: 2020-09-04
Anticipated expiration: 2039-02-28
Also published as: CN111621337B

Abstract

The invention relates to a novel burner feed distribution system, and particularly provides a combustion system which comprises a multi-channel burner with at least 4 channels and a delivery subsystem capable of delivering fuel raw materials to different fuel channels of the burner respectively. The delivery subsystem includes a fuel feedstock storage tank, a fuel feedstock pump for delivering fuel feedstock from the fuel feedstock storage tank to the burner via the delivery line, and a fuel feedstock delivery line.

Description

Novel burner feeding distribution system

Technical Field

The invention relates to a burner feed distribution system, in particular to a gasification coal water slurry feed distribution system.

Background

Burners are combustion devices used in industrial fuel furnaces and typically include fuel inlets/channels, oxidant inlets/channels and orifices to distribute the fuel and oxidant so that the fuel and oxidant (e.g., air) are ejected and mixed for combustion in a manner.

The clean and efficient utilization of coal is not only the key for converting coal into clean secondary energy and chemicals, but also the link between the utilization of coal and environmental protection. With the development of industrial technologies, coal gasification technologies have gone through the first generation fixed bed gasification technology, the second generation fluidized bed gasification technology and the third generation entrained flow gasification technology. From the viewpoint of the form of the fuel raw material, there are pulverized coal lump coal gasification, granulated coal gasification, pulverized coal gasification, coal water slurry gasification and the like. The third generation entrained flow coal gasification technology using pulverized coal and coal water slurry as feeding states has become a main method and means for clean and efficient utilization of coal. The coal water slurry gasification technology has good fuel raw material conveying, metering and operation stability except the limit on the aspects of the ash melting point, the slurry forming property and the like of coal, and is a coal gasification technology widely applied at present. As one of the key parts of gasification, the burner directly determines the operational stability and reliability of the coal slurry gasification technology.

On the other hand, with the development of gasification technology, the raw material for gasification tends to have various sources, and sludge, petroleum coke, natural gas, and/or fuel gas, etc. are used for the gasification process in addition to conventional fine coal or coal water slurry.

In the prior coal water slurry gasification, the feeding of a process burner is generally three channels, and oxygen is two channels which are divided into a central oxygen channel and a peripheral annular oxygen channel; the coal water slurry is a single channel and is positioned between the central oxygen channel and the annular oxygen channel. The crushing and atomization of the coal water slurry are realized through the high-speed shearing of oxygen introduced into the central oxygen channel and the annular oxygen channel in the process burner.

CN1431143A discloses a burner for producing synthetic gas by partial oxidation of multi-channel natural gas, which is composed of a central dummy piece, an annular space gasifying agent guide pipe, a natural gas guide pipe, a steam guide pipe, corresponding nozzles fixedly connected with the guide pipes, and cooling system parts. The burner is mainly used for partial oxidation of natural gas, so that distribution of different coal slurries cannot be realized.

CN102492479A discloses a three-channel slurry fuel gasification burner, which comprises a coaxial outer ring channel spray pipe, a middle ring channel spray pipe, a central channel spray pipe, an outer ring spray head, a middle ring spray head and a central spray head, slurry fuel enters a gasification furnace from the middle ring channel, a gasification agent is divided into two parts and enters the gasification furnace from the central channel and the outer ring channel, a side gasification agent spray hole is arranged on the side surface of the central spray head, the gasification agent can enter the middle ring channel from the central channel along the side gasification agent spray hole, and an end surface gasification agent spray hole is arranged on the end surface of the central spray head. The slurry fuel has only one channel, and the distribution of different slurries cannot be realized.

CN 103937555A discloses a single nozzle coal water slurry entrained flow gasifier and a gasification method thereof, wherein a process nozzle extending into the gasification chamber is arranged in a nozzle chamber, the process nozzle is a first channel-a 2n channel from inside to outside in sequence along the axial direction, n is more than or equal to 3 and less than or equal to 6, an ignition gun is arranged in the first channel, the second channel, the fourth channel, … … and the 2n channel are all used for introducing an oxidant, and the third channel, … … and the 2n-1 channel are all used for introducing coal water slurry. CN 103937555 a also does not discuss the distribution of different slurries.

For burners used in various existing facilities, such as burners of coal water slurry gasification facilities, a combustion system configured to perform combustion generally includes a fuel material supply subsystem (generally composed of a fuel material (e.g., coal water slurry) storage tank, a high-pressure fuel material (e.g., coal water slurry) pump, and a fuel material (e.g., coal water slurry) supply line, a process burner, and a combustion chamber (e.g., a gasifier used for coal water slurry).

Disclosure of Invention

The present inventors have found that by appropriate adjustment of the associated combustion system (particularly, for example, the transport subsystem) included in a plant using burners, in conjunction with a particular burner, rather than merely direct adjustment of the burner itself, efficient distribution of different materials and improved gasification can be achieved.

The combustion system comprises a multi-channel burner with at least 4 channels and a delivery subsystem capable of delivering fuel raw materials to different fuel channels of the burner respectively.

According to the present invention, in one embodiment, the delivery subsystem is capable of delivering at least two different fuel feedstocks to the multi-channel burner, respectively.

In one embodiment according to the invention, the delivery subsystem comprises a fuel feedstock storage tank, a fuel feedstock pump for delivering fuel feedstock from the fuel feedstock storage tank to the burner via the delivery line, and a fuel feedstock delivery line.

In one embodiment according to the invention, the fuel feedstock pump comprises at least two variable frequency pumps, thereby enabling separate delivery of at least two different fuel feedstocks via at least two channels, respectively.

In one embodiment according to the invention, the fuel feed pump is a variable rate split diaphragm plunger pump, the plunger pump being of the single inlet multiple outlet type, wherein the number of outlets is equal to the number of fuel feed channels in the multi-channel burner, thereby achieving an efficient split between the fuel channels for one fuel feed. Or the fuel raw material pump comprises at least two variable frequency pumps, wherein the number of the variable frequency pumps is equal to the number of the channels of the fuel raw materials in the multi-channel burner, so that the effective distribution among a plurality of fuel channels is realized for one fuel raw material

In general, the invention provides embodiments of, for example, the following aspects:

1. a combustion system comprising a multi-channel burner having at least 4 channels and a delivery subsystem capable of delivering fuel feedstock to different fuel channels of the burner respectively.

2. The combustion system of aspect 1, wherein the delivery subsystem comprises a fuel feedstock reservoir, a fuel feedstock pump, and a fuel feedstock delivery line, the fuel feedstock pump for delivering fuel feedstock from the fuel feedstock reservoir to the burner tip via the delivery line.

3. The combustion system according to the aspect 1 is characterized in that the multi-channel burner has 2n channels, which are a first channel and a 2 n-th channel from inside to outside in sequence along the axial direction, and n is preferably more than or equal to 2 and less than or equal to 6; the odd channels are used for supplying oxidant to the burners, and the even channels are used for supplying fuel raw materials to the burners.

4. The combustion system according to any one of aspects 1 to 3, wherein the fuel material pump is a variable rate distribution type diaphragm plunger pump, the plunger pump is of a single-in n-out type, wherein the number n of outlets of the plunger pump is equal to the number n of channels of the fuel material in the multi-channel burner, thereby realizing effective distribution among a plurality of fuel channels for one fuel material; the method is characterized in that a fuel raw material is adopted, wherein the fuel raw material pump comprises n variable frequency pumps, the number n of the variable frequency pumps is equal to the number n of the channels of the fuel raw material in the multi-channel burner, and therefore effective distribution among a plurality of fuel channels is achieved for the fuel raw material.

5. The combustion system of any of aspects 1-3, wherein the fuel feedstock pump comprises n variable frequency pumps, wherein the number n of variable frequency pumps is equal to the number n of channels of fuel feedstock in the multi-channel burner, thereby enabling at least two different fuel feedstocks to be delivered through n fuel channels, respectively.

6. A combustion system according to any of the aspects 1-3, characterized in that for at least two different fuel stocks, one separate fuel stock storage tank is used for each fuel stock; alternatively, for at least two different fuel feedstocks, a fuel feedstock storage tank is shared having separate compartments for storing the different fuel feedstocks in each compartment.

7. A combustion system according to any of the aspects 1-3, characterized in that the fuel feedstock is pulverized coal, coal-water-slurry, sludge, petroleum coke, natural gas and/or fuel gas, preferably coal-water-slurry.

8. The combustion system according to any one of aspects 1 to 3, wherein the multi-channel burner has 4 channels for gasifying the fuel raw material, and a membrane plunger pump of a deviation ratio distribution type is used to realize that the fuel raw material is respectively conveyed in a required proportion through two annular channels of a second channel and a fourth channel from the inside to the outside along the axial direction, and the plunger pump adopts a single-in double-out type; preferably, the fuel feedstock is a coal water slurry; alternatively, two variable frequency pumps are used to achieve the desired ratio of fuel feedstock to be delivered through two annular passages, a second passage and a fourth passage, axially from the inside to the outside.

9. The combustion system according to aspect 8, wherein the fuel material is distributed between the two fuel passages of the second and fourth passages such that the desired ratio of the fuel material delivered in the inner second passage relatively near the center of the burner and the fuel material delivered in the outer fourth passage, respectively, is from about 60:40 to about 95:5, preferably from about 75:25 to about 90:10, by weight.

10. The combustion system according to aspect 9, characterized in that the oxidant is suitably distributed between the two oxidant channels in the first and third channels such that the desired ratio of oxidant delivered in the first channel for oxidant in the centre of the burner and in the third channel for oxidant on the outside, respectively, is from about 5:95 to about 40:60 by weight, with a preferred ratio being from about 10:90 to about 25: 75; the oxidant is preferably oxygen.

11. The combustion system according to any one of aspects 1 to 3, wherein the multi-channel burner is a 4-channel burner for gasifying fuel raw materials, and two different fuel raw materials are respectively conveyed through two annular channels, namely a second channel and a fourth channel, from the inside to the outside along the axial direction by using two variable frequency pumps; preferably, one of the fuel feedstocks is a coal water slurry and the other is sludge, petroleum coke, natural gas, fuel gas or a mixture thereof, preferably sludge or petroleum coke.

12. The combustion system according to aspect 11, wherein the fuel material is distributed between the two fuel passages of the second and fourth passages such that the desired ratio of the fuel material delivered in the inner second passage relatively near the center of the burner and the fuel material delivered in the outer fourth passage, respectively, is from about 60:40 to about 95:5, preferably from about 75:25 to about 90:10, by weight.

13. The combustion system according to aspect 12, characterized in that the oxidant is suitably distributed between the two oxidant channels in the first and third channels such that the desired ratio of oxidant delivered in the first channel for oxidant in the centre of the burner and in the third channel for oxidant on the outside, respectively, is from about 5:95 to about 40:60 by weight, with a preferred ratio being from about 10:90 to about 25: 75; the oxidant is preferably oxygen.

Drawings

FIG. 1 shows an embodiment of the present invention using two variable frequency pumps to achieve separate delivery of two fuel feedstocks through two fuel channels, wherein two fuel feedstock reservoirs are used for each of the two fuel feedstocks.

FIG. 2 shows an embodiment of the present invention using two variable frequency pumps to effect separate delivery of two fuel feedstocks through two fuel paths, wherein the two fuel feedstocks share a fuel feedstock reservoir having two compartments separated.

FIG. 3 shows an embodiment of the present invention using a biased ratio dispensing diaphragm plunger pump to feed a fuel feedstock and dispense it into two fuel channels.

Detailed Description

The following detailed description of the embodiments of the present invention is provided, but it should be noted that the scope of the present invention is not limited by the embodiments, but is defined by the appended claims.

All publications, patent applications, patents, and other references mentioned in this specification are herein incorporated by reference in their entirety. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.

When the specification describes materials, methods, components, devices, or apparatus as "known to one of ordinary skill in the art" or "conventional in the art" or the like, such terms are intended to encompass those conventionally used in the art at the time of filing this application, but also those not currently in use, but which would become known in the art to be suitable for a similar purpose.

Reference herein to "coal-water slurry" is to its art-recognized meaning and designation, and generally refers to a coal-based fuel in which coal, water, and optional additives are combined in amounts that are in the form of a slurry that can be pumped, atomized, stored, and stably combusted on ignition.

The invention refers to a "gasification furnace" with the meaning and the object known in the art, which generally refers to a device for gasifying raw materials, converting the gasified raw materials into gas products and a small amount of residues, cooling and washing high-temperature gas and residues, wherein the gasification agent is mainly water vapor, air (oxygen) or a mixed gas of the water vapor and the air (oxygen), and the gasification furnace comprises a gasification chamber (or a reaction chamber and a combustion chamber) at the upper part and a chilling chamber at the lower part.

Finally, unless otherwise expressly indicated, all percentages, parts, ratios, etc. referred to in this specification are by weight unless otherwise generally recognized by those skilled in the art.

The invention provides a combustion system comprising a multi-channel burner having at least 4 channels and a delivery subsystem capable of delivering fuel feedstock to different fuel channels of the burner respectively. The fuel raw material and the oxidant conveyed to the burner by the conveying subsystem are respectively sprayed out of the burner through different channels of the burner and enter the combustion chamber for combustion.

The present invention can be applied to various forms of apparatuses including a combustion system to perform combustion through a burner, such as a boiler, a coal (pulverized coal or coal water slurry) gasification furnace, and the like. The preferred apparatus for combustion by means of burners of the present invention is a gasifier, for example a gasifier for coal water slurry.

The multi-channel burner available in the invention has at least 4 channels which are a first channel and a 2n channel from inside to outside in sequence along the axial direction, and n is preferably more than or equal to 2 and less than or equal to 6. The first channel is a central channel, and the rest channels are annular channels which are sequentially arranged from inside to outside along the axial direction. In one embodiment, an odd number of channels are used for the oxidant, e.g., the first, third, … …, 2n-1 channels are all used for the passage of oxidant; even numbered passages are used for fuel feed, for example, the second passage, the fourth passage, … …, the 2 n-th passage are used for passing fuel feed. Or, alternatively, an odd number of channels are used for fuel feedstock, e.g., the first, third, … …, 2n-1 channels are used to pass fuel feedstock; even numbered channels are used for oxidant, e.g., the second, fourth, … …, 2n channels are used for oxidant introduction. Preferably, an odd number of channels are used for the introduction of the oxidizing agent; while the even numbered channels are used for the introduction of fuel feedstock.

Other configurations, materials and compositions of burners useful in the present invention, in addition to the above described channel arrangements, may be employed as known to those skilled in the art.

Oxidants useful in the present invention include, but are not limited to, air or oxygen. Fuel feedstocks useful in the present invention include, but are not limited to, pulverized coal, coal-water slurry, sludge, petroleum coke, natural gas, and/or fuel gas. The specific composition and source of the fuel feedstock useful in the present invention, such as pulverized coal or coal-water slurry, may employ those conventionally used in the art.

In one embodiment, the even number of channels of the multi-channel burner are used for feeding fuel raw materials and are used as fuel channels, and each fuel channel is respectively fed with different fuel raw materials. In one embodiment, the multi-channel burner is a 4-channel burner, wherein the first channel in the center and the third channel outside are oxidant channels, and the second channel between the first and third channels and the fourth channel at the outermost side are fuel channels.

The apparatus for combustion by means of a burner (e.g., a gasification furnace) usable in the present invention may employ, in addition to the above-described burner, other components, structures, materials and compositions known to those skilled in the art. For example, in a typical embodiment, the combustion apparatus using a burner according to the present invention is a gasification furnace including a burner, a combustion chamber for combusting a fuel raw material and an oxidant discharged from the burner, and a washing/cooling chamber located below the combustion chamber. Preferably, the combustion chamber of the gasification furnace is surrounded by a heat insulating material or has a cooling device.

In one embodiment, a separate fuel feedstock storage tank is used for each fuel feedstock, according to the present invention, for the different fuel feedstocks. In another embodiment, one fuel feedstock storage tank is shared for a plurality of different fuel feedstocks, but has separate compartments to store each fuel feedstock separately in each compartment. In one embodiment, each of the individual fuel feed storage tanks or each of the compartments of a common one of the fuel feed storage tanks is in switchable fluid communication.

In one embodiment according to the present invention, a fuel feedstock is used, the fuel feedstock pump being a variable ratio distribution diaphragm plunger pump, the plunger pump being of the single-in-multiple-out (i.e., an inlet that receives fuel feedstock from a fuel feedstock reservoir via a line and multiple outlets that deliver fuel feedstock to multiple fuel channels of a multi-channel burner via multiple lines, respectively), wherein the number of outlets is equal to the number of fuel feedstock channels in the multi-channel burner, thereby achieving efficient distribution between the multiple fuel channels for a fuel feedstock. In one embodiment, a variable rate split diaphragm plunger pump is used, with a multi-channel burner having 2n (preferably 2. ltoreq. n.ltoreq.6) channels, in a single in, n out fashion to provide efficient splitting between the n fuel channels. In one embodiment, a fuel feedstock is employed, the fuel feedstock pump comprising at least two variable frequency pumps, thereby achieving an efficient distribution among a plurality of fuel channels for a fuel feedstock. In one embodiment, for a multi-channel burner having 2n (preferably 2. ltoreq. n. ltoreq.6) channels, n variable frequency pumps are used to achieve an efficient distribution between the n fuel channels for one fuel feedstock. For embodiments where a plurality of variable frequency pumps are used to achieve a fuel feed distribution, each variable frequency pump receives fuel feed from a fuel feed reservoir via a respective line and delivers fuel feed to a respective fuel channel of the multi-channel burner via a respective line.

In the above-described embodiment using a fuel feedstock according to the present invention, it is preferred that the fuel feedstock is a coal water slurry. The coal used by the coal water slurry can be from a single source, can also be from different sources, or can be from different specifications of products from the same source; for these different coals, a coal water slurry as a fuel feedstock can be formulated by blending the coal prior to grinding the coal.

In accordance with the present invention, in one embodiment, at least two fuel feedstocks are employed. For example, one fuel feedstock is coal water slurry and the other is sludge, petroleum coke, natural gas, and/or fuel gas, such as petroleum coke. Correspondingly, the fuel raw material pump comprises at least two variable frequency pumps, so that a plurality of different fuel raw materials are respectively conveyed through at least two fuel channels. In one embodiment, for a multi-channel burner with 2n (preferably 2. ltoreq. n. ltoreq.6) channels, n variable frequency pumps are used to feed not more than n different materials separately.

In one exemplary embodiment, the multi-channel burner is a 4-channel burner, and a single-in-double-out offset ratio split diaphragm plunger pump is used to deliver one fuel feed separately to both fuel channels of the burner and optionally to achieve the proper distribution of the fuel feed between the two fuel channels. In one exemplary embodiment, the multi-channel burner is a 4-channel burner, and 2 variable frequency pumps are used to deliver two fuel feedstocks to the two fuel channels of the burner separately, and optionally to achieve the proper distribution of the fuel feedstocks between the two fuel channels.

In one embodiment, the fuel feedstock pump is configured to be able to adjust the flow rate of the fuel feedstock delivered in at least one of the at least 2 fuel channels by monitoring the flow rate of the fuel feedstock delivered in the at least 2 fuel channels and adjusting the flow rate of the fuel feedstock delivered in at least one of the at least 2 fuel channels based on, for example, a difference or ratio in the flow rates of the fuel feedstock delivered in the at least 2 fuel channels such that the delivered fuel feedstock is distributed in the appropriate proportion in the at least 2 fuel channels. Preferably, in another embodiment, the fuel feedstock pump is configured to be able to adjust the flow rate of the fuel feedstock delivered in at least one of the fuel channels by monitoring the product physicochemical properties (e.g., product distribution, target product yield, conversion, content, etc.) of the combustion system (e.g., for coal water slurry gasification, monitoring the gasifier outlet) and adjusting the fuel feedstock delivered in at least one of the fuel channels according to the product distribution so that the delivered fuel feedstock is distributed in the appropriate proportion in the at least 2 fuel channels.

For example, in one embodiment, for a four-channel burner, the fuel feed is appropriately distributed between the two fuel channels such that the desired ratio of fuel feed delivered in the inner fuel channel (e.g., the second channel) relatively near the center of the burner to the outer fuel channel (e.g., the fourth channel), respectively, is from about 60:40 to about 95:5 (weight fraction), with a preferred ratio being from about 75:25 to about 90:10 (weight fraction). Without being bound by any known theory, it is believed that if the ratio of the inner slurry to the outer slurry is the same, the slurry atomization effect is reduced and the efficiency of the final gasification is reduced due to the poor shearing effect of oxygen on the outer slurry. Preferably, when at least two fuel feedstocks are used, one of the fuel feedstocks is a coal water slurry and the other is sludge, petroleum coke, natural gas and/or fuel gas, such as petroleum coke; it is also preferred that the coal-water slurry fuel feed is distributed in a larger proportion and the other fuel feed is distributed in a correspondingly smaller proportion.

Accordingly, in one embodiment, for a four-channel burner, the oxidant (e.g., oxygen) is suitably distributed between the two oxidant channels such that the desired ratio of oxidant (e.g., oxygen) delivered in the inner oxidant channel (e.g., first channel) and the outer oxidant channel (e.g., third channel) in the center of the burner is from about 5:95 to about 40:60 (weight fraction), with a preferred ratio being from about 10:90 to about 25:75 (weight fraction).

The offset ratio-split diaphragm plunger pump or inverter pump usable in the present invention is not particularly limited as long as it can be used for the transportation of conventional fuel raw materials such as pulverized coal, coal-water slurry, petroleum coke, or the like, and/or can achieve the above-described proportional distribution with respect to the fuel raw materials transported in different fuel passages. Fuel feedstocks such as those conventionally used in the coal water slurry art may be used, for example, the GEHO PUMPS available from GEHO PUMS IN the Netherlands and the FELUWA PUMPS available from FELUWA PUMPS Inc. in Germany.

According to the invention, in an exemplary embodiment, the multi-channel burner is a 4-channel burner for gasifying coal water slurry, and the coal water slurry fuel raw material is respectively conveyed through the second annular channel and the fourth annular channel by using a deviation ratio distribution type diaphragm plunger pump, and the plunger pump adopts a single-inlet double-outlet type.

In this exemplary embodiment, the biased ratio dispensing diaphragm piston pump includes two delivery modules that are coaxial but isolated to correspond to two fuel passages, respectively. In order to realize the distribution of the required proportion of the fuel raw materials in the two fuel channels, the two delivery modules respectively correspond to large-flow delivery and small-flow delivery, and the small-flow delivery unit can be disassembled without influencing the independent operation of the large-flow delivery module. Because the pistons of all the pump cylinders are driven by the same motor through the same shaft, the large-flow outlet and the small-flow outlet can realize the load adjustment in the same proportion. The pressure drop of the coal slurry pipeline system of the fuel channel relative to the outer ring is different from that of the coal slurry pipeline system of the fuel channel relative to the inner ring, so that the pressure of two outlets of the pump is inconsistent, and the deviation ratio distribution type pump can adapt to the working conditions of different discharge pressures of two paths of coal slurry. Similarly, for a single inlet n (preferably 2. ltoreq. n. ltoreq.6) outlet plunger pump, the delivery modules can be configured to correspond to different fuel passages, respectively, to achieve a load modulation of the same proportion between different flow rates.

According to the invention, in an exemplary embodiment, the multi-channel burner is a 4-channel burner and is used for gasifying coal water slurry, and two variable frequency pumps are used for realizing the respective conveying of two fuel raw materials through a second annular channel and a fourth annular channel; wherein, for example, one fuel feedstock is coal water slurry and the other is sludge, petroleum coke, natural gas, and/or fuel gas, such as petroleum coke.

In the exemplary embodiment, two coal water slurry fuel passages of the 4-passage burner are respectively corresponding to the two coal water slurry fuel passages by two variable frequency pumps. And for the two variable frequency pumps, distributing the corresponding variable frequency pumps according to the flow. In order to realize the distribution of the required proportion of the two different fuels in the two fuel channels, the flow rates of the two fuels are different, and for this purpose, one large pump is corresponding to the large-flow channel, and one small pump is corresponding to the small-flow channel. The variable frequency pump can conveniently and quickly adjust the flow of the fuel raw materials of the fuel channel relative to the inner ring and the flow of the fuel raw materials of the fuel channel relative to the outer ring, thereby realizing the distribution control of the required proportion of the two fuel raw materials and also realizing the different discharge pressures of the fuel raw materials of different channels. Similarly, for n (preferably 2. ltoreq. n.ltoreq.6) variable frequency pumps, the pumps can be respectively configured in size to correspond to different fuel passages to achieve load regulation between different flow rates.

For example, referring to FIG. 1, two fuel feedstocks enter a slurry inverter pump 105 via line 103 and a slurry inverter pump 106 via line 104. The fuel feed variable frequency pump 105 adjusts its flow and pressure according to the desired flow and pressure and feeds through line 107 to a second channel 109 for fuel feed in a burner 111. The fuel feed frequency conversion pump 106 adjusts its flow and pressure according to the desired flow and pressure and feeds through line 108 to a fourth channel 110 in the outer annulus for fuel feed in a burner 111. The oxygen is divided into two paths after passing through the manifold 112, one path is fed into a first channel 113 for oxygen in the burner 111 at the center through a pipeline 113, and the other path is fed into a third channel 114 for oxygen in the burner 111 through a pipeline 114. Through the adjustment of different flow ratios of

different burner channels

109, 110, 115, 116, the burner can be better protected, and a flow field as close to plug flow as possible is formed in the gasification furnace.

In one embodiment according to the invention, the fuel feed pump is a single-in multiple-out (e.g. 2, 3, 4, 5, or 6 outlets) offset ratio split diaphragm plunger pump, and each outlet is connected to a fuel passage of a burner via a separate transfer line. In one embodiment, the fuel feed pump is a plurality of variable frequency pumps (e.g., 2, 3, 4, 5, or 6) and each outlet is connected to a fuel passage of a burner via a separate transfer line.

Examples

The present invention will be described in further detail with reference to examples, but the present invention is not limited to these examples.

Example 1

The coal water slurry gasification furnace for processing coal and petroleum coke for one day is 1000 tons, the pressure of the gasification furnace is 6.5MPaG, the gasification temperature is 1300 ℃, and the oxidant is pure oxygen.

Coal water slurry is prepared by grinding raw material coal from Shenhua and organic wastewater from a certain chemical plant, the concentration of the coal water slurry is 61wt%, and the coal water slurry is sent into a storage tank A through a pipeline 101. Petroleum coke slurry prepared by adding water to petroleum coke is ground and then sent into a storage tank B through a pipeline 102, and the concentration of the petroleum coke slurry is 62wt%, as shown in figure 1. The raw material composition is shown in table 1 and table 2.

Two channels of conveying of the flow of the coal water slurry and the flow of the petroleum coke are realized through two variable frequency pumps, wherein one large pump 105 corresponds to a large-flow channel, and one small pump 106 corresponds to a small-flow channel. The process burner is a four-channel burner, oxidant is introduced into the first and

third channels

115 and 116 from the inside to the outside along the axial direction, and fuel is introduced into the second and

fourth channels

109 and 110.

The coal water slurry in the storage tank A enters a slurry variable frequency pump 105 through a pipeline 103 and is sent to a second channel 109 of the inner side slurry in a process burner 111 through a pipeline 107. The petroleum coke slurry in the storage tank B enters a slurry variable frequency pump 106 through a pipeline 104, the flow and the pressure of the slurry variable frequency pump 106 are adjusted according to the required flow and pressure, and the petroleum coke slurry is sent to a fourth channel 110 of the outer slurry in a burner 111 through a pipeline 108. The flow ratio of the inverter pumps 105 and 106 is controlled to 80:20, that is, the flow ratio of the fuel material distributed in the second and fourth passages is 80: 20.

The oxygen is divided into two paths after passing through the manifold 112, one path is fed into a first path 115 of central oxygen in the burner 111 through a line 113, and the other path is fed into a third path 116 of annular oxygen in the burner 111 through a line 114. The flow ratio of the first channel 115 to the third channel 116 for central oxygen is 15: 85.

The composition of the syngas after the slurry is gasified by the gasifier is shown in table 3.

TABLE 1 feed coal and Petroleum Coke compositions

	Unit of	Raw material coal	Petroleum coke
				C	wt%	71.82	87.04
H	wt%	4.26	3.58
				N	wt%	0.82	2.77
S	wt%	0.81	6
				O	wt%	11.51	0.31
Ash (Ash content)	wt%	10.78	0.31

TABLE 2 composition of organic waste water

	Unit of	Dioctyl phthalate	Dioctyl adipate	Ethanol	Water (W)
						Composition of	wt%	＜0.5	＜0.5	＜0.8	～98.2

TABLE 3 Synthesis gas composition (dry basis)

Composition of	Unit of	Numerical value
			H₂	mol%	36.23
CO	mol%	45.54
			CO₂	mol%	16.38
H₂S	mol%	1.37
			COS	mol%	0.02
CH₄	mol%	0.02
			N₂	mol%	0.33
AR	mol%	0.12

Example 2

The coal-water slurry gasification furnace for treating coal and oil sludge in 1000 tons per day has the gasification pressure of 6.5MPaG, the gasification temperature of 1300 ℃ and the oxidant of pure oxygen.

Coal water slurry is prepared by grinding raw material coal from Shenhua and organic wastewater from a certain chemical plant, the concentration of the coal water slurry is 61wt%, and the coal water slurry is sent into a storage tank chamber C through a pipeline 201. A mixed slurry of Shenhua raw material coal and oily sludge from a chemical plant in a ratio of 8:2 and water is ground and fed into the storage tank chamber D through a pipeline 202, and the slurry concentration is 60wt%, as shown in FIG. 2. The raw material compositions are shown in table 4, table 5 and table 6.

Two channels for conveying the flow of the coal water slurry and the mixed slurry are realized through two variable frequency pumps, one large pump 205 corresponds to a large-flow channel, and one small pump 206 corresponds to a small-flow channel. The process burner is a four-channel burner, oxidant is introduced into the first channel 215 and the third channel 216, and fuel is introduced into the second channel 209 and the fourth channel 210.

The mixed slurry in the tank compartment C is fed via line 203 to a slurry inverter pump 205 and via line 207 to the second channel 209 for the inner slurry in the process burner 211. The mixed slurry in the tank chamber D enters a slurry variable frequency pump 206 through a line 204, and the slurry variable frequency pump 206 adjusts the flow rate and pressure according to the required flow rate and pressure, and sends the mixed slurry to a fourth channel 210 of the outer slurry in the burner 211 through a line 208. The flow ratio of the inverter pumps 205 and 206 is controlled to 80:20, that is, the flow ratio of the fuel material distributed in the second and fourth passages is 80: 20.

The oxygen is split into two paths after passing through header 212, one path being fed via line 213 to a first channel 215 for central oxygen in burner 211 and the other path being fed via line 214 to a third channel 216 for annular oxygen in burner 211. The flow ratio of the first channel 215 to the third channel 216 for central oxygen is 15: 85.

The composition of the syngas after the slurry is gasified by the gasifier is shown in table 7.

TABLE 4 feed coal composition

	Unit of	Raw material coal
			C	wt%	71.82
H	wt%	4.26
			N	wt%	0.82
S	wt%	0.81
			O	wt%	11.51
Ash	wt%	10.78

TABLE 5 organic waste water composition

TABLE 6 oily sludge composition

	Unit of	Hydrocarbons	Colloids and asphaltenes	Mud	Water (W)
						Composition of	wt%	＜2	＜3	＜15	～80

TABLE 7 Synthesis gas composition (dry basis)

Composition of	Unit of	Numerical value
			H₂	mol%	35.50
CO	mol%	43.28
			CO₂	mol%	20.07
H₂S	mol%	0.71
			COS	mol%	0.02
CH₄	mol%	0.01
			N₂	mol%	0.28
AR	mol%	0.12

Example 3

A coal water slurry gasification furnace for treating 1500 tons of coal per day has the gasification pressure of 6.5MPaG, the gasification temperature of 1300 ℃ and the oxidant of pure oxygen.

Raw material coal from Shenhua is ground into coal water slurry with the concentration of 62wt% and sent into a storage tank E through a pipeline 301, as shown in figure 3. The raw coal composition is shown in table 8.

The process burner is a four-channel burner, oxidant is introduced into the central first channel and the outer third channels 312 and 313, and fuel is introduced into the second and

fourth channels

306 and 307. The coal slurry in the storage tank E enters a diaphragm plunger pump 303 through a pipeline 302, the diaphragm plunger pump adopts a single-inlet double-outlet type, the flow and the pressure of the diaphragm plunger pump 303 are adjusted according to the required flow and pressure, and an outlet coal slurry is sent to a second channel 306 of the inner side slurry in a process burner 308 through a pipeline 304. The other side outlet slurry is fed via line 305 to the fourth channel 307 for the outer slurry in burner 308. The flow ratio of the fuel feedstock dispensed in the second and fourth channels was 75: 25.

The oxygen is split into two paths after passing through the manifold 309, one path being fed via line 310 to the first channel 312 of central oxygen in burner 308 and the other path being fed via line 311 to the third channel 313 of annular oxygen in burner 8. The flow ratio of the first channel 312 to the third channel 313 of central oxygen is 15: 85.

The composition of the synthesis gas after the slurry is gasified by the gasifier is shown in Table 9.

TABLE 8 feed coal composition

TABLE 9 Synthesis gas composition (dry basis)

Composition of	Unit of	Numerical value
			H₂	mol%	36.42
CO	mol%	44.39
			CO₂	mol%	18.52
H₂S	mol%	0.18
			COS	mol%	0.02
CH₄	mol%	0.02
			N₂	mol%	0.33
AR	mol%	0.12

In the foregoing specification, the inventive concept has been described with reference to specific embodiments. However, one of ordinary skill in the art appreciates that various modifications and changes can be made without departing from the scope of the present invention as set forth in the claims below. Accordingly, the specification and figures are to be regarded in an illustrative rather than a restrictive sense, and all such modifications and changes are intended to be included within the scope of present invention.

It is appreciated that certain features are, for clarity, described herein in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features that are, for brevity, described in the context of a single embodiment, may also be provided separately or in any subcombination.

Claims

2. The combustion system of claim 1 wherein the delivery subsystem comprises a fuel feedstock reservoir, a fuel feedstock pump, and a fuel feedstock delivery line, the fuel feedstock pump for delivering fuel feedstock from the fuel feedstock reservoir to the burner tip via the delivery line.

3. The combustion system of claim 1, wherein the multi-channel burner has 2n channels, which are a first channel to a 2n channel from inside to outside in sequence along the axial direction, preferably 2 ≤ n ≤ 6; the odd channels are used for supplying oxidant to the burners, and the even channels are used for supplying fuel raw materials to the burners.

4. A combustion system according to any one of claims 1 to 3, wherein the fuel feed pump is a split ratio diaphragm plunger pump of the single in n out type, wherein the number n of outlets of the plunger pump is equal to the number n of channels of fuel feed in the multi-channel burner, thereby achieving an effective distribution of fuel feed among the plurality of fuel channels; the method is characterized in that a fuel raw material is adopted, wherein the fuel raw material pump comprises n variable frequency pumps, the number n of the variable frequency pumps is equal to the number n of the channels of the fuel raw material in the multi-channel burner, and therefore effective distribution among a plurality of fuel channels is achieved for the fuel raw material.

5. A combustion system according to any of claims 1-3, characterized in that the fuel feed pump comprises n variable frequency pumps, wherein the number n of variable frequency pumps is equal to the number n of channels of fuel feed in the multi-channel burner, thereby enabling separate delivery of at least two different fuel feeds through n fuel channels, respectively.

6. A combustion system according to any of claims 1-3, characterized in that for at least two different fuel stocks, one separate fuel stock tank is used for each fuel stock; alternatively, for at least two different fuel feedstocks, a fuel feedstock storage tank is shared having separate compartments for storing the different fuel feedstocks in each compartment.

7. A combustion system according to any of claims 1-3, characterized in that the fuel feedstock is pulverized coal, coal-water-slurry, sludge, petroleum coke, natural gas and/or fuel gas, preferably coal-water-slurry.

8. A combustion system according to any one of claims 1 to 3, wherein the multi-channel burner has 4 channels for gasifying the fuel raw material, and a membrane plunger pump of a deviation ratio distribution type is used to realize that a fuel raw material is separately fed in a desired ratio through two annular channels of a second channel from the inside to the outside in the axial direction and a fourth channel of the phase, and the plunger pump is of a single-in-double-out type; preferably, the fuel feedstock is a coal water slurry; alternatively, two variable frequency pumps are used to achieve the desired ratio of fuel feedstock to be delivered through two annular passages, a second passage and a fourth passage, axially from the inside to the outside.

9. The combustion system of claim 8, wherein the fuel feed is distributed between the two fuel passages of the second and fourth passages such that the desired ratio of fuel feed delivered in the inner second passage relatively near the center of the burner to fuel feed delivered in the outer fourth passage is from about 60:40 to about 95:5, preferably from about 75:25 to about 90:10, by weight.

10. Combustion system according to claim 9, characterized in that the oxidant is suitably distributed between the two oxidant channels in the first and third channels such that the desired ratio of the oxidant to be fed in the first channel for oxidant in the centre of the burner and in the third channel for oxidant on the outside, respectively, is from about 5:95 to about 40:60 by weight, preferably from about 10:90 to about 25: 75; the oxidant is preferably oxygen.

11. The combustion system as claimed in any one of claims 1 to 3, wherein the multi-channel burner is a 4-channel burner for gasifying fuel raw materials, and two variable frequency pumps are used for respectively conveying two different fuel raw materials through two annular channels, namely a second channel and a fourth channel, from inside to outside along the axial direction; preferably, one of the fuel feedstocks is a coal water slurry and the other is sludge, petroleum coke, natural gas, fuel gas or a mixture thereof, preferably sludge or petroleum coke.

12. The combustion system of claim 11, wherein the fuel feed is distributed between the two fuel passages of the second and fourth passages such that the desired ratio of fuel feed delivered in the inner second passage relatively near the center of the burner to fuel feed delivered in the outer fourth passage is from about 60:40 to about 95:5, preferably from about 75:25 to about 90:10, by weight.

13. Combustion system according to claim 12, characterized in that the oxidant is suitably distributed between the two oxidant channels in the first and third channels such that the desired ratio of the oxidant to be fed in the first channel for oxidant in the centre of the burner and in the third channel for oxidant on the outside, respectively, is from about 5:95 to about 40:60 by weight, preferably from about 10:90 to about 25: 75; the oxidant is preferably oxygen.