CN106190328B - Powder lock hopper pressurizing system and powder lock hopper pressurizing method using same - Google Patents
Powder lock hopper pressurizing system and powder lock hopper pressurizing method using same Download PDFInfo
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- CN106190328B CN106190328B CN201510224902.8A CN201510224902A CN106190328B CN 106190328 B CN106190328 B CN 106190328B CN 201510224902 A CN201510224902 A CN 201510224902A CN 106190328 B CN106190328 B CN 106190328B
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Abstract
The invention provides a powder lock hopper pressurizing system and a powder lock hopper pressurizing method using the same. The system comprises a lock bucket, wherein a lock bucket top air inlet pipeline, a cone upper branch air inlet pipeline, a cone lower branch air inlet pipeline and a lock bucket bottom air inlet pipeline are arranged on the lock bucket. The method comprises a dust remover and vent pipe combined pressurizing stage, a vent pipe and vertical pipe combined pressurizing stage, a vent pipe, vent cone and vertical pipe combined pressurizing stage, a vent cone and vertical pipe combined pressurizing stage and a vent cone trickle pressurizing stage. The whole pressurizing process is controlled by program logic, and the method of multi-branch combined gas supply and setting of a plurality of lock hopper pressure characteristic values is adopted, so that the gas supply capacity of the system is utilized to the maximum extent, the lock hopper pressurizing efficiency is improved, and the equipment is prevented from being damaged by high-pressure airflow.
Description
Technical Field
The invention relates to the field of gas-solid two-phase flow, in particular to a pressurizing process of a pressurized powder lock hopper, and particularly relates to a powder lock hopper pressurizing system and a powder lock hopper pressurizing method using the same.
Background
The powder lock hopper is essential key equipment in a plurality of industrial production processes, and the powder lock hopper enables process equipment with different functions to be connected and communicated with production links to form a unified whole. The powder lock hopper is simultaneously connected with the normal pressure storage bin above and the high pressure reactor below, and the powder can be successfully transited from normal pressure to high pressure through four processes of receiving, pressurizing, discharging and decompressing, so that the purposes of low-pressure powder connection and high-pressure powder connection are achieved, and the feeding to the high pressure reactor is realized.
In order to meet the requirement of continuous and stable operation of a high-pressure reactor, the powder lock hopper is required to be completed within a specified time. For a specific powder medium, the receiving time of the powder lock hopper is often determined by the structure of the upper normal-pressure storage bin and the size of a valve of the discharge port. The pressure relief time of the powder lock hopper is closely related to the structural strength of the dust remover, and the current industry adopts multi-stage pressure relief operation, so that the pressure relief can be completed quickly, and the excessive erosion of the dust remover by high-pressure airflow is avoided. On the other hand, high-pressure powder blanking is a technical difficulty, and although experts and scholars at home and abroad are dedicated to overcoming the problem, the problem is difficult to be solved in a short time. In comparison, the pressurization process which seems to be simple occupies most of the operation period of the powder lock hopper, and a larger optimization space exists.
Taking an entrained flow bed pulverized coal pressurized gasification process as an example, the operation period of a pulverized coal lock bucket is as long as 50min, the full load and even high load operation requirements of a gasification furnace are restricted, the continuous, stable and long-period operation of a gasification device is influenced to a certain extent, and a solution is needed urgently. The reason is that the pressurizing process of the pulverized coal lock hopper has a long low-speed pressurizing stage, the pressurizing efficiency of the lock hopper is low, the pressurizing time is about 28min, and the pressurizing time occupies more than 50% of the total operation period.
Therefore, the method for pressurizing the powder lock hopper is optimized to improve the pressurizing efficiency of the lock hopper and shorten the operation period of the lock hopper, and is a very necessary measure at the present stage.
Disclosure of Invention
The invention aims to overcome the defects of long low-speed pressurizing stage, low pressurizing efficiency of a lock hopper, long operation period of the lock hopper and the like in the pressurizing process of a coal powder lock hopper in the prior art, and provides a powder lock hopper pressurizing system and a powder lock hopper pressurizing method using the same.
One of the objectives of the present invention is to provide a method for improving the current situation of long pressurization time of the existing industrial lock hopper, so as to achieve the purpose of optimized operation. The invention aims to remove a long low-speed pressurizing stage in the current industrial lock hopper pressurizing operation, achieve the purposes of high-speed pressurizing in the whole process and shortening the pressurizing time, and simultaneously, because the pressurizing sequence and the pressurizing time of each air flow are reasonably controlled, the subsequent process operation can not be influenced, and the equipment structure can be ensured.
The invention solves the technical problems through the following technical scheme:
a powder lock hopper pressurizing system comprises a lock hopper, wherein the lock hopper comprises a cone part, and is characterized in that a lock hopper top air inlet pipeline is connected with the top of the lock hopper through a dust remover, and a lock hopper top air inlet valve is arranged on the lock hopper top air inlet pipeline; a cone upper branch air inlet pipeline is connected with the upper part of the cone through a vent pipe, and a cone upper branch air inlet valve is arranged on the cone upper branch air inlet pipeline; the cone lower branch air inlet pipeline is connected with the lower part of the cone through an air cone, and a cone lower branch air inlet valve is arranged on the cone lower branch air inlet pipeline; the air inlet pipeline at the bottom of the lock hopper is connected with the bottom of the lock hopper through a vertical pipe, and the air inlet pipeline at the bottom of the lock hopper is provided with an air inlet valve at the bottom of the lock hopper; and the locking bucket top air inlet pipeline, the cone upper branch air inlet pipeline, the cone lower branch air inlet pipeline and the locking bucket bottom air inlet pipeline are connected with an air supply system.
Preferably, a pressure difference control valve is arranged between the cone upper branch air inlet valve and the vent pipe.
The vent pipe is tightly attached to the wall surface of the lock hopper, a plurality of small holes are formed in the vent pipe, and gas enters the lock hopper through the vent hole; the coal chemical industry device is also provided with a flute pipe, and the flute pipe is named as a vent pipe for being popularized to a common lock hopper pressurizing method. The branch inlet valve is a control switch and is arranged at the far end. The differential pressure control valve is arranged to control the gas flow and protect the rear 'vent pipe'.
Preferably, a flow limiting orifice plate is arranged between the air inlet valve at the top of the lock hopper and the dust remover, between the pressure difference control valve and the vent pipe, between the air inlet valve of the cone lower branch passage and the vent cone, and between the air inlet valve at the bottom of the lock hopper and the vertical pipe. The restriction orifice plate has a restriction effect.
The invention also provides a powder lock hopper pressurizing method using the powder lock hopper pressurizing system, which is characterized by comprising the following steps:
S1: the dust remover and the vent pipe are combined in a pressurizing stage: simultaneously opening an air inlet valve at the top of the lock hopper and an air inlet valve of a cone upper branch, and allowing air to enter the lock hopper through a dust remover and a vent pipe;
S2: the combined pressurizing stage of the vent pipe and the vertical pipe comprises the following steps: when the pressure of the lock bucket reaches a characteristic value PaWhen the air inlet valve at the top of the lock hopper is closed, the air inlet valve at the bottom of the lock hopper is opened, air enters the lock hopper through the vertical pipe, and the characteristic value P is obtainedaThe setting of (A) depends on the performance of the dust remover and the powder flow performance;
S3: the combined pressurizing stage of the vent pipe, the vent cone and the vertical pipe comprises the following steps: when the pressure of the lock bucket reaches a characteristic value PbWhen the air inlet valve of the lower branch of the cone part is opened, the air enters the lock hopper through the air inlet cone, and the characteristic value P is obtainedbThe setting of (a) depends on the strength of the vent cone;
S4: and (3) a combined pressurizing stage of the ventilation cone and the vertical pipe: when the pressure of the lock bucket reaches a characteristic value PcThen, the pyramid upper branch intake valve is closed, and the characteristic value PcIs set depending on the lock target pressure Pt；
S5: a trickle charging stage of the aeration cone: when the pressure of the lock bucket reaches a characteristic value PdWhen the pressure reaches the target pressure P of the lock hopper, the air inlet valve at the bottom of the lock hopper is closed, and only the air inlet of the air cone is reserved until the pressure reaches the target pressure P of the lock hoppertThe pressurizing process is completed, the characteristic value PdIs set depending on the lock target pressure Pt。
The steps adopt a multi-airflow combined pressurizing mode to ensure that the pressurizing speed reaches the maximum value allowed by the air supply system and the pressurizing efficiency is optimized. Meanwhile, a plurality of lock bucket pressure characteristic values P are seta，Pb，Pc，Pd，PtAnd by means of a program logic control method, equipment can be effectively protected from being damaged by high-pressure airflow. Procedure for measuring the movement of a moving objectThe logic control can control the opening and closing of the valve, and the opening and closing conditions can be written in the program in advance.
The method is suitable for powder lock hopper pressurizing systems with different pressures, the target pressure of the lock hopper is flexible and changeable, and the target pressure can be set according to downstream equipment and system characteristics.
The main function of the dust remover is to prevent the dust from being entrained in the air. In step S1In the middle, the back-blowing air inlet at the top can blow off part of the powder attached to the filter element in the dust remover, thereby improving the dust removal performance of the dust remover and prolonging the service life of the dust remover; the air is supplied to the air pipe on the cone part, so that the compaction effect of the top air flow on the powder in the lock hopper can be relieved.
Preferably, a pressure difference control valve is arranged between the cone upper branch air inlet valve and the vent pipe, and a pressure difference value delta P is reasonably set.
The differential pressure control valve controls the gas flow by setting a certain differential pressure (the gas flow is considered to be approximately proportional to the 0.5 power of the differential pressure), so as to protect the vent pipe.
Preferably, the lock bucket target pressure PtA characteristic value P of 4.9MPaa0.59MPa +/-0.1 MPa and characteristic value Pb1MPa +/-0.1 MPa, characteristic value Pc4.65MPa +/-0.05 MPa and characteristic value PdIs 4.85MPa +/-0.02 MPa.
Preferably, the differential pressure value Δ P is 0.2 MPa. + -. 0.02 MPa.
Preferably, the gas is an inert gas, such as compressed air, nitrogen or carbon dioxide.
Preferably, the powder is coal powder, petroleum coke powder or biomass powder.
In the present invention, the above-mentioned preferred conditions can be arbitrarily combined on the basis of general knowledge in the field, and thus, preferred embodiments of the present invention can be obtained.
The positive progress effects of the invention are as follows: the powder lock hopper pressurizing system and the powder lock hopper pressurizing method using the same utilize the air supply capacity of the system to the maximum extent, meet the optimization of pressurizing efficiency, shorten the pressurizing time and the operation period of the powder lock hopper, and optimize the feeding process of the powder lock hopper to the high-pressure reactor; the invention can achieve the purpose of protecting equipment from being damaged by high-pressure airflow by setting a plurality of lock hopper pressure characteristic values and controlling operation in a programmed manner.
Drawings
Fig. 1 is a schematic structural view of a pulverized coal feed unit of an entrained flow pulverized coal pressure gasification process according to embodiment 1 of the present invention.
Fig. 2 is a combined powder lock hopper pressurization system according to embodiment 1 of the present invention.
FIG. 3 is a lock hopper pressure time sequence and a pressure increasing rate curve of a lock hopper pressure increasing process of the prior entrained flow pulverized coal pressure gasification process.
Fig. 4 is a lock hopper pressure time series and a pressure increasing rate curve of the lock hopper pressure charging process of the entrained flow pulverized coal pressure gasification process in embodiment 2 of the present invention.
Fig. 5 is a schematic view of a powder lock hopper pressurization method in embodiment 2 of the present invention.
Detailed Description
The present invention will be more clearly and completely described below in conjunction with two preferred embodiments.
Example 1
In the entrained-flow bed pulverized coal pressurized gasification process, a pulverized coal feeding unit is shown in figure 1 and comprises two links of locking hopper feeding and pressurized dense-phase pneumatic conveying, wherein 1 is a normal-pressure storage bin, 2 is a pulverized coal locking hopper, 3 is a high-pressure feeding tank and 4 is a gasification furnace. The lock hopper feeding refers to the process of feeding coal powder from a normal pressure storage bin 1 to a high pressure feeding tank 3 through a coal powder lock hopper 2, and the pressurizing dense phase pneumatic conveying refers to the process of feeding coal powder from the high pressure feeding tank 3 to a gasification furnace 4.
An embodiment of the invention in powder lock hopper pressurization is described below with reference to fig. 2, and a powder lock hopper pressurization system comprises a lock hopper 5, wherein the lock hopper comprises a cone part, a lock hopper top air inlet pipeline is connected with the top of the lock hopper through a dust remover 6, and a lock hopper top air inlet valve 8 is arranged on the lock hopper top air inlet pipeline; a cone upper branch air inlet pipeline is connected with the upper part of the cone through an air pipe 14, and a cone upper branch air inlet valve 9 is arranged on the cone upper branch air inlet pipeline; a cone lower branch air inlet pipeline is connected with the lower part of the cone through an air cone 15, and a cone lower branch air inlet valve 10 is arranged on the cone lower branch air inlet pipeline; a locking hopper bottom air inlet pipeline is connected with the bottom of the locking hopper through a vertical pipe 16, and a locking hopper bottom air inlet valve 11 is arranged on the locking hopper bottom air inlet pipeline; and the air inlet pipeline at the top of the locking bucket, the air inlet pipeline at the upper cone part, the air inlet pipeline at the lower cone part and the air inlet pipeline at the bottom of the locking bucket are connected with an air supply system 7.
Wherein, a pressure difference control valve 12 is arranged between the branch inlet valve on the cone part and the vent pipe. The differential pressure control valve is arranged to control the gas flow and protect the rear 'vent pipe'.
And a flow limiting orifice plate 13 is arranged between the air inlet valve at the top of the lock hopper and the dust remover, between the pressure difference control valve and the vent pipe, between the air inlet valve of the cone part lower branch circuit and the vent cone, and between the air inlet valve at the bottom of the lock hopper and the vertical pipe. The restriction orifice plate has a restriction effect.
The powder lock hopper pressurizing system can be applied to pressurizing processes of various powder lock hoppers, and is particularly suitable for a pulverized coal lock hopper pressurizing process. According to the invention, the plurality of vent pipelines are arranged on the lock hopper, so that an operator can flexibly set the opening and closing of each vent pipeline, and conditions are created for improving the pressurizing efficiency. The invention also has good structural strength and can meet the pressurizing requirements of various target pressure values. The invention can greatly improve the pressurizing speed, has the effect of preventing overcharging, and is safe and reliable to operate.
Example 2
This example describes an embodiment of the powder lock hopper pressurization method applied to the entrained flow pulverized coal pressure gasification process in combination with fig. 2 to 5 on the basis of the powder lock hopper pressurization system in example 1.
The pressure of the gasification furnace is 3.9MPa, the load is 42t/h, and the conveying gas is CO2。
In the entrained flow bed pulverized coal pressure gasification process, a dense-phase pneumatic conveying system requires that the conveying pressure difference is 1MPa, and the pressure of a high-pressure feeding tank is 4.9 MPa. To ensure that the feeding process of the coal powder locking bucket does not cause the systemThe pressure fluctuation influences the stable operation of the gasification furnace, and the target pressure of the coal powder lock hopper is the same as the pressure of the high-pressure feeding tank. The coal powder lock hopper has the following characteristic pressure values in sequence: pa＝0.59MPa，Pb＝1MPa，Pc＝4.65MPa，Pd＝4.85MPa，Pt4.9 MPa; the designed pressure difference value delta P of the pressure difference control valve is 0.2 MPa; the maximum charging rate that the gas supply system can provide is about 4 kPa/s.
The method is applied to the coal powder lock hopper pressurizing process and comprises the following specific steps:
(1) meanwhile, a locking hopper top air inlet valve 8 and a cone upper branch air inlet valve 9 of the coal powder locking hopper 5 are opened, and air from an air supply system 7 enters the coal powder locking hopper 5 from a dust remover 6 and a vent pipe 14 through a flow limiting orifice plate 13. The dust removal performance of the dust remover 6 is improved in a back flushing mode; the protection of the vent pipe is realized by installing a differential pressure control valve 12 on the air inlet pipeline of the cone upper branch and setting the differential pressure value to be 0.2 MPa.
(2) When the pressure of the coal powder lock hopper 5 rises to 0.59MPa, the air inlet valve 8 at the top of the lock hopper is closed, the air inlet valve 11 at the bottom of the lock hopper is opened, and air enters the coal powder lock hopper 5 from the vertical pipe 16 through the flow-limiting orifice plate 13.
(3) When the pressure of the coal powder lock hopper 5 rises to 1MPa, the air inlet valve 10 of the cone part lower branch circuit is opened, and air enters the coal powder lock hopper 5 from the air cone 15 through the flow limiting orifice plate 13.
(4) When the pressure of the pulverized coal lock 5 rises to 4.65MPa, the cone upper branch inlet pipeline valve 9 is closed.
(5) When the pressure of the coal powder lock hopper 5 is increased to 4.85MPa, the air inlet valve 11 at the bottom of the lock hopper is closed.
(6) The pressure of the coal powder lock hopper 5 is increased to 4.9MPa, and the pressurizing process is finished.
FIG. 3 is a lock hopper pressure time series and pressure increasing rate curve of a lock hopper pressure charging process of the prior entrained flow pulverized coal pressure gasification process. As can be seen from the figure, although the gas supply system can work at a charging rate of 4kPa/s, due to the restriction of an operation method, the current coal powder lock hopper charging process has a low-rate (<1kPa/s) charging stage with a length of about 10min, so that the charging efficiency is influenced, and the whole charging process takes about 28 min.
If the combined program control lock bucket rapid pressurizing method is adopted, the combined pressurizing method ensures that the pressurizing rate of each stage reaches the maximum allowable value of 4kPa/s, and the pressure time sequence and the pressurizing rate curve of the pulverized coal lock bucket are shown in figure 4. As can be seen from the figure, the method effectively eliminates the low-speed pressurizing stage, the pressurizing rate of the whole process is basically maintained at about 4kPa/s, the time consumption of pressurizing is about 20min, the pressurizing time is shortened by about 30 percent compared with the prior art, and the pressurizing efficiency of the lock hopper is optimized.
The rate of charging depends on two aspects: 1 is gas supply system performance; 2 is the actual gas flow. The present invention assumes that the overall system air supply capacity is constant and that a maximum inlet air flow rate must be set in order to achieve a maximum charge rate. Because the pressure difference control valve and the flow-limiting orifice plate arranged on part of the branches have the flow-limiting function, combined pressurization and simultaneous air inlet of a plurality of branches are sometimes adopted to ensure the operation at the maximum pressurization rate.
The opening and closing of each valve, namely the air inlet sequence of each branch, are selected by comprehensively considering the strength of the protection equipment and ensuring the powder flow property.
The pressure characteristic value is set by considering the strength of the protective equipment and the flowability of the powder, and also considering the response capability of the interlocking system. In particular, for PaIf P isaThe dust remover is too low in setting, the back blowing time of the dust remover is short, powder adhered to the inner wall cannot be blown off effectively, and the dust removing effect and the practical service life of the dust remover are influenced; but P isaIf the pressure difference between the inside and the outside of the lock hopper is too high, the back flushing effect of the dust remover is not obvious, and more importantly, the top pressurizing for too long time is likely to compact the powder in the lock hopper, so that the subsequent process operation is not facilitated. During the pressurizing process, the pressure difference between the inside and the outside of the lock hopper (the current pressure in the lock hopper of the gas supply system) is gradually reduced, and the gas flow passing through the flow-limiting orifice plate is gradually reduced. Therefore, the intake branch charge may be gradually increased to ensure that the charging rate is always "high". PbThe arrangement of the lock mainly aims at protecting the ventilation cone, if the set value is too low, the pressure difference between the inside and the outside of the lock bucket is high, and the ventilation cone is easily compressed by high pressure airStream destruction; pcAnd PdMainly to prevent overcharging and to set a protection value.
Therefore, the setting of each feature value is a result of comprehensively considering the factors, and is dependent on the whole system.
For powder lock hopper pressurization, the invention comprehensively considers three factors of pressurization speed, equipment structure and powder flow property. From the speed increasing perspective, the combination and multi-branch air inlet can meet the requirement of high speed; from the viewpoint of equipment structure, air is required to be sequentially fed according to the strength of single equipment; from the powder flow properties, the lower the compaction charge at the top, the better, and the lower the fluidization charge, which can mitigate this effect.
Although the invention is described above by taking the coal powder lock hopper pressurizing method as an example, the invention is not limited to pressurizing the coal powder lock hopper, and is also applicable to pressurizing other powder lock hoppers, and the powder can be petroleum coke powder, biomass powder and the like. The gas selected in the above embodiments is not limited to the present invention, and the pressurizing gas may be an inert gas, or compressed air, nitrogen, or carbon dioxide. In addition, the selection of the characteristic values in the pressurizing method is not limited to the values selected in the above embodiments. The target pressure of the lock bucket can be selected according to actual needs, and accordingly, each characteristic value also needs to be adjusted according to the target pressure value and the condition of the whole system. Under various conditions, the pressurizing method provided by the invention can improve the pressurizing efficiency, realize the whole-process high-speed pressurizing, and simultaneously effectively protect the whole system so as to ensure the safe and reliable operation of the system. In addition, the pressurizing method is particularly suitable for the condition that the target pressure value of the lock hopper is high, and the effect of improving the pressurizing efficiency of the lock hopper is very obvious.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (9)
1. A powder lock hopper pressurizing method using a powder lock hopper pressurizing system is characterized in that the powder lock hopper pressurizing system comprises a lock hopper, the lock hopper comprises a cone part, and the powder lock hopper pressurizing system is characterized in that a lock hopper top air inlet pipeline is connected with the top of the lock hopper through a dust remover and is provided with a lock hopper top air inlet valve; a cone upper branch air inlet pipeline is connected with the upper part of the cone through a vent pipe, and a cone upper branch air inlet valve is arranged on the cone upper branch air inlet pipeline; the cone lower branch air inlet pipeline is connected with the lower part of the cone through an air cone, and a cone lower branch air inlet valve is arranged on the cone lower branch air inlet pipeline; the air inlet pipeline at the bottom of the lock hopper is connected with the bottom of the lock hopper through a vertical pipe, and the air inlet pipeline at the bottom of the lock hopper is provided with an air inlet valve at the bottom of the lock hopper; the locking bucket top air inlet pipeline, the cone part upper branch air inlet pipeline, the cone part lower branch air inlet pipeline and the locking bucket bottom air inlet pipeline are connected with an air supply system;
the powder locking bucket pressurizing method comprises the following steps:
S1: the dust remover and the vent pipe are combined in a pressurizing stage: simultaneously opening an air inlet valve at the top of the lock hopper and an air inlet valve of a cone upper branch, and allowing air to enter the lock hopper through a dust remover and a vent pipe;
S2: the combined pressurizing stage of the vent pipe and the vertical pipe comprises the following steps: when the pressure of the lock bucket reaches a characteristic value PaWhen the air inlet valve at the top of the lock hopper is closed, the air inlet valve at the bottom of the lock hopper is opened, air enters the lock hopper through the vertical pipe, and the characteristic value P is obtainedaThe setting of (A) depends on the performance of the dust remover and the powder flow performance;
S3: the combined pressurizing stage of the vent pipe, the vent cone and the vertical pipe comprises the following steps: when the pressure of the lock bucket reaches a characteristic value PbWhen the air inlet valve of the lower branch of the cone part is opened, the air enters the lock hopper through the air inlet cone, and the characteristic value P is obtainedbThe setting of (a) depends on the strength of the vent cone;
S4: and (3) a combined pressurizing stage of the ventilation cone and the vertical pipe: when the pressure of the lock bucket reaches a characteristic valuePcThen, the pyramid upper branch intake valve is closed, and the characteristic value PcIs set depending on the lock target pressure Pt；
S5: a trickle charging stage of the aeration cone: when the pressure of the lock bucket reaches a characteristic value PdWhen the pressure reaches the target pressure P of the lock hopper, the air inlet valve at the bottom of the lock hopper is closed, and only the air inlet of the air cone is reserved until the pressure reaches the target pressure P of the lock hoppertThe pressurizing process is completed, the characteristic value PdIs set depending on the lock target pressure Pt。
2. The powder lock hopper pressurizing method according to claim 1, wherein a differential pressure control valve is provided between the cone upper branch inlet valve and the vent pipe in the powder lock hopper pressurizing system.
3. The powder lock hopper pressurizing method according to claim 2, wherein in the powder lock hopper pressurizing system, a flow-limiting orifice plate is arranged between the lock hopper top intake valve and the dust remover, between the differential pressure control valve and the vent pipe, between the cone part lower branch intake valve and the vent cone, and between the lock hopper bottom intake valve and the vertical pipe.
4. The powder lock hopper pressurizing method according to claim 1, wherein a pressure difference control valve is arranged between the cone upper branch inlet valve and the vent pipe, and a pressure difference value Δ P is set reasonably.
5. The powder lock hopper pressurizing method as recited in claim 4, wherein the target lock hopper pressure PtCharacteristic value P of 4.9MPaa0.59MPa +/-0.1 MPa and characteristic value Pb1MPa +/-0.1 MPa, characteristic value Pc4.65MPa +/-0.05 MPa and characteristic value PdIs 4.85MPa +/-0.02 MPa.
6. The powder lock hopper pressurizing method of claim 5, wherein the pressure difference value Δ P is 0.2MPa ± 0.02 MPa.
7. The powder lock hopper pressurization method of claim 1, wherein the gas is an inert gas.
8. The powder lock hopper pressurizing method according to claim 1, wherein the gas is compressed air, nitrogen or carbon dioxide.
9. The powder lock hopper pressurizing method according to claim 1, wherein the powder is pulverized coal, petroleum coke powder or biomass powder.
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