A method for controlling the centralized supply of fuel oil to an incinerator

Abstract

A method for controlling the centralized supply of fuel oil to an incinerator belongs to the field of environmental protection technology. It comprises a plurality of fuel delivery pumps, the outlets of the plurality of fuel delivery pumps are connected to a fuel delivery manifold, a pressure detection device and a flow detection device are arranged on the fuel delivery manifold, a fuel return pipe is led out from the fuel delivery manifold, a return flow regulating valve is arranged on the fuel return pipe, and a plurality of fuel-using devices are connected to the end of the fuel delivery manifold. By monitoring the delivery pressure and delivery flow of the fuel delivery manifold, the centralized fuel supply system is made to work in the best state by adjusting the number of fuel delivery pumps opened and the opening of the fuel return regulating valve, and when the number and flow of the incinerator's oil points change, it can automatically adjust to establish a new equilibrium state. This method can meet the fuel supply needs of single / multiple incinerator oil points, realize the centralized supply of fuel and automatic flow adjustment, and has a simple structure and a high degree of automation.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to a method for controlling the centralized supply of fuel oil to an incinerator. Background Art

[0002] During the startup and operation of the incinerator, auxiliary fuels such as diesel are needed to adjust the combustion conditions in the furnace. When the incinerator is started, the diesel burner is used for ignition; when the incinerator is running, the combustion heat load in the furnace is adjusted by adjusting the flow of diesel injected into the furnace, thereby achieving the effect of furnace temperature regulation. In order to make the furnace temperature uniform and stable, multiple diesel spray guns or burners with different flow rates need to be set along the periphery and height direction of the furnace, so that a single incinerator has multiple incinerator oil points. If multiple incinerators are arranged in a centralized manner, the number of incinerator oil points in the project will increase exponentially, and the oil parameters will also be more complicated.

[0003] The fuel points of incinerators have the characteristics of frequent switching and large flow changes. Setting up a single centralized fuel supply system cannot meet the different oil parameter requirements of different incinerator fuel points, and lacks the ability to adjust the minimum and maximum flow rates of the centralized fuel supply system. Therefore, in previous projects, even if there are multiple incinerators arranged centrally, a single incinerator fuel point or a few incinerator fuel points with similar parameters are often equipped with a separate centralized fuel supply system. This results in the need to configure two or more centralized fuel supply systems for the entire plant, resulting in low equipment utilization, cumbersome operation, and a huge waste of funds and land. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a centralized fuel supply control method for an incinerator, which utilizes the monitoring of the delivery pressure and delivery flow of the fuel delivery manifold, and adjusts the number of fuel delivery pumps opened and the opening of the fuel return regulating valve to make the centralized fuel supply system work in the best state, and can automatically adjust and establish a new equilibrium state when the number and flow of the incinerator's oil points change. The method of the present invention can meet the fuel supply needs of a single / multiple incinerator oil points, realize the centralized supply of fuel and automatic flow adjustment, and has a simple structure and a high degree of automation.

[0005] The embodiment of the present invention provides a centralized fuel supply control method for an incinerator, the method includes multiple fuel delivery pumps, the outlets of the multiple fuel delivery pumps are connected to a fuel delivery manifold, a pressure detection device and a flow detection device are arranged on the fuel delivery manifold, a fuel return pipe is led out from the fuel delivery manifold, a return flow regulating valve is arranged on the fuel return pipe, and the end of the fuel delivery manifold is connected to multiple fuel points of the incinerator, and the specific control method includes the following contents:

[0006] Step 1: Enter the flow value Q0 of the optimal operating point of a single fuel delivery pump, the flow fluctuation threshold Q' of the optimal operating point of a single fuel delivery pump, enter the delivery pressure control value P0 of the fuel delivery manifold, the delivery pressure control fluctuation threshold P' of the fuel delivery manifold, define the delivery flow range Q0±Q' of the optimal operating point of a single fuel delivery pump, and the delivery pressure control range P0±P' of the fuel delivery manifold,

[0007] When the incinerator is detected to have a demand for fuel, the centralized fuel supply system is automatically started;

[0008] Step 2, start the fuel delivery pumps one by one, and simultaneously monitor the fuel delivery pressure P1 of the fuel delivery manifold at the fuel delivery pump outlet. When P1 reaches the fuel delivery manifold delivery pressure control range P0±P', maintain the start number N of the existing fuel delivery pumps;

[0009] Step 3: read the fuel delivery flow Q1 of the fuel delivery manifold, and simultaneously read the number of fuel delivery pump startups N, compare the sum of the optimal operating point flow rates of all running fuel delivery pumps N*(Q0±Q') with the actually detected fuel delivery flow Q1 of the fuel delivery manifold, and adjust the number of running fuel delivery pumps and the opening of the reflux flow regulating valve according to the comparison result:

[0010] If N*(Q0-Q')<Q1<N*(Q0+Q'), the reflux regulating valve remains closed;

[0011] If Q1<N*(Q0-Q'), the reflux flow control valve is opened, and a PID adjustment mechanism is established between the reflux flow control valve opening and P1 to make P1 approach P0;

[0012] If Q1>N*(Q0+Q'), then shut down a running fuel delivery pump, open the reflux flow regulating valve at the same time, and establish a PID regulation mechanism between the reflux flow regulating valve opening and P1 to make P1 approach P0;

[0013] Step 4: The centralized fuel supply system reaches a balance and maintains operating status.

[0014] As a further improvement of the present invention, the optimal operating point flow rate of the fuel delivery pump and the fuel delivery manifold delivery pressure control value are determined by the working performance curve of the fuel delivery pump and the layout of the fuel delivery pump outlet pipeline and equipment.

[0015] As a further improvement of the present invention, when the number and flow rate of the incinerator's oil points change, the centralized fuel supply system can automatically adjust to meet the changes in the incinerator's fuel usage demand, specifically:

[0016] When the fuel demand of the incinerator changes, the control system first detects that the fuel delivery pressure of the fuel delivery manifold at the fuel delivery pump outlet changes to P1'. The control system adjusts the start or stop of the fuel delivery pump according to the changed P1' value to make P1' reach the fuel delivery manifold delivery pressure control range P0±P';

[0017] The control system reads the fuel delivery flow rate of the fuel delivery manifold at this time as Q1 and the latest number of fuel delivery pump operations N', and compares N'*(Q0±Q') with Q1', and adjusts the number of fuel delivery pump operations and the opening of the reflux flow regulating valve according to the method described in step 3;

[0018] The centralized fuel supply system establishes a new equilibrium state and maintains this state until the next change in the fuel demand of the incinerator.

[0019] As a further improvement of the present invention, the number of fuel delivery pumps and the regulating capacity of the fuel return flow regulating valve can meet the continuous regulation requirements of the minimum and maximum fuel consumptions supplied to all incinerator oil points, and the number of fuel delivery pumps is not less than three, with the same or different specifications.

[0020] As a further improvement of the present invention, the centralized fuel supply system supplies fuel to multiple incinerator fuel points with different fuel demands of multiple incinerators, and the usage time and usage flow rate of each incinerator fuel point vary randomly.

[0021] As a further improvement of the present invention, necessary pipes and valves are arranged before the incinerator oil points to meet the fuel supply pressure requirements of different incinerator oil points.

[0022] The beneficial effects of the present invention are:

[0023] (1) It can meet the fuel supply needs of single / multiple incinerators, with simple structure, saving equipment investment and land occupation.

[0024] (2) When the number and flow rate of the incinerator's oil points change, it can automatically adjust and match so that the centralized fuel supply system always operates at the optimal flow rate and pressure without manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0026] Figure 1The invention discloses a method for controlling the centralized supply of fuel oil to an incinerator according to an embodiment of the invention.

[0027] Figure 2 The present invention is a process flow chart of a method for controlling the centralized supply of fuel oil to an incinerator according to an embodiment of the present invention.

[0028] Figure 3 This is a working performance curve of a fuel delivery pump in an incinerator fuel centralized supply control method described in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, in the description of the present invention, the terms used are only for illustrative purposes and are not intended to limit the scope of the present invention. The terms "include" and / or "comprise" are used to specify the existence of the elements, steps, operations and / or components, but do not exclude the existence or addition of one or more other elements, steps, operations and / or components. The terms "first", "second" and the like may be used to describe various elements, do not represent the order, and do not limit these elements. In addition, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is two and more than two. These terms are only used to distinguish one element from another element. In conjunction with the following drawings, these and / or other aspects become apparent, and it is easier for a person of ordinary skill in the art to understand the description of the embodiments of the present invention. The accompanying drawings are used to describe the embodiments of the present invention for illustrative purposes only. Those skilled in the art will easily recognize from the following description that, without departing from the principles of the present invention, alternative embodiments of the structures and methods shown in the present invention can be adopted.

[0032] The embodiment of the present invention provides a method for controlling the centralized supply of fuel oil to an incinerator, such as Figure 1As shown, the centralized fuel supply control method for an incinerator involves multiple fuel delivery pumps, and the outlets of the multiple fuel delivery pumps are connected to a fuel delivery collection pipe. A pressure detection device and a flow detection device are provided on the fuel delivery collection pipe. A fuel return pipe is led out from the fuel delivery collection pipe, and a reflux flow regulating valve is provided on the fuel return pipe. The end of the fuel delivery collection pipe is connected to multiple incinerator oil points.

[0033] According to the working curve of the fuel delivery pump, combined with the layout of the fuel delivery pump outlet pipeline and equipment, the delivery flow range of the fuel delivery pump at the optimal operating point is determined to be Q0±Q', and the delivery pressure control range of the fuel delivery manifold is P0±P'. After the fuel delivery pump is started, all the fuel enters the fuel delivery manifold, and the fuel delivery manifold delivers fuel to multiple incinerator oil points. The pressure detection device detects the fuel delivery pressure, and the flow detection device detects the fuel flow entering the incinerator oil point. The control system adjusts the number of fuel delivery pump operations and the opening of the reflux flow regulating valve according to the established procedure, so that the fuel delivery pump always operates within the flow and pressure operating range designed by the control system. The specific control method includes the following:

[0034] Step 1: Enter the flow value Q0 of the optimal operating point of a single fuel delivery pump, the flow fluctuation threshold Q' of the optimal operating point of a single fuel delivery pump, the fuel delivery manifold delivery pressure control value P0, the fuel delivery manifold delivery pressure control fluctuation threshold P', define the delivery flow range Q0±Q' of the optimal operating point of a single fuel delivery pump, and the fuel delivery manifold delivery pressure control range P0±P',

[0035] When it is detected that the incinerator has a demand for fuel, the centralized fuel supply system is automatically started.

[0036] Step 2: start the fuel delivery pumps one by one, and simultaneously monitor the fuel delivery pressure P1 of the fuel delivery pump outlet manifold. When P1 reaches the fuel delivery manifold delivery pressure control range P0±P', maintain the number N of start-ups of the existing fuel delivery pumps.

[0037] Step 3: Read the fuel delivery flow Q1 of the fuel delivery manifold, and simultaneously read the number of fuel delivery pump starts N, compare the sum of the optimal operating point flow of all running fuel delivery pumps N*(Q0±Q') with the actual monitored fuel delivery flow Q1 of the fuel delivery manifold, and adjust the number of fuel delivery pump starts and the opening of the reflux flow regulating valve according to the comparison result.

[0038] If N*(Q0-Q')<Q1<N*(Q0+Q'), the reflux regulating valve remains closed;

[0039] If Q1<N*(Q0-Q'), the reflux flow control valve is opened, and a PID adjustment mechanism is established between the reflux flow control valve opening and P1 to make P1 approach P0;

[0040] If Q1>N*(Q0+Q'), a running fuel delivery pump is shut down, and the reflux flow regulating valve is opened at the same time, and a PID regulating mechanism is established between the reflux flow regulating valve opening and P1 to make P1 approach P0.

[0041] Step 4: The centralized fuel supply system reaches a balance and maintains operating status.

[0042] When the fuel demand of the incinerator changes, the control system first detects that the fuel delivery pressure of the fuel delivery manifold at the fuel delivery pump outlet changes to P1'. The control system adjusts the start and stop of the fuel delivery pump according to the changed P1' value, so that P1' reaches the fuel delivery manifold delivery pressure control range P0±P'; the control system reads that the fuel delivery flow of the fuel delivery manifold at this time becomes Q1', and the number of fuel delivery pump operations at this time is N'. The control system compares N'*(Q0±Q') with Q1'.

[0043] If N'*(Q0-Q')<Q1'<N'*(Q0+Q'), the reflux regulating valve remains closed;

[0044] If Q1'<N'*(Q0-Q'), the reflux flow regulating valve is opened, and a PID regulating mechanism is established between the reflux flow regulating valve opening and P1' to make P1' approach P0;

[0045] If Q1'>N'*(Q0+Q'), a running fuel delivery pump is shut down, and the reflux flow regulating valve is opened at the same time, and a PID regulating mechanism is established between the reflux flow regulating valve opening and P1' to make P1' approach P0.

[0046] The centralized fuel supply system establishes a new balance until the next change in the incinerator fuel usage demand.

[0047] A method for controlling the centralized supply of fuel oil to an incinerator according to an embodiment of the present invention is as follows: Figure 2As shown, an embodiment method includes the following delivery control process and method: a centralized fuel supply system includes a fuel storage tank and F fuel delivery pumps, F is a natural integer greater than or equal to 3, liquid fuel such as diesel is stored in the fuel storage tank, fuel enters from the inlet of each fuel delivery pump, is discharged from the outlet of each fuel delivery pump and enters the fuel delivery manifold, a pressure detection device and a flow detection device for fuel delivery are arranged on the fuel delivery manifold, a fuel return pipe is led out from the fuel delivery manifold, the end of the fuel return pipe is connected to an inlet of the fuel storage tank, and the end of the fuel delivery manifold is connected to X incinerator oil points, X is a natural integer greater than or equal to 3.

[0048] When the centralized fuel supply system is started, the fuel delivery pumps are turned on one by one from the 1# fuel delivery pump to the F# fuel delivery pump in sequence, and the pressure changes of the fuel delivery manifold during the fuel delivery pump opening process are monitored simultaneously. When the pressure of the fuel delivery manifold reaches the preset optimal pressure threshold, the next fuel delivery pump is stopped and the running state of the currently opened fuel delivery pump is maintained. According to the working performance curve of the fuel delivery pump, the corresponding flow of each fuel delivery pump under the working pressure can be obtained, and the sum of the delivery flow of all fuel delivery pumps is calculated. At this time, the flow detection value of the current fuel delivery manifold is read, and the difference is compared with the sum of the calculated summed flow:

[0049] If the fuel delivery pump is operating at the optimal flow rate point at this time, the current operating state will be maintained;

[0050] If the working flow rate of the fuel delivery pump is lower than the optimal flow rate operating point at this time, the reflux flow regulating valve is opened, the opening degree of the reflux flow regulating valve is interlocked with the pressure detection value of the fuel delivery manifold, and the adjustment target value of the fuel delivery pressure of the fuel delivery manifold is the middle value of the preset optimal pressure threshold;

[0051] If the working flow rate of the fuel delivery pump is greater than the optimal flow operating point at this time, the last fuel delivery pump that is started and running will be shut down, and the reflux flow regulating valve will be opened at the same time. The opening of the reflux flow regulating valve is interlocked with the pressure detection value of the fuel delivery manifold, and the adjustment target value of the fuel delivery pressure of the fuel delivery manifold is the middle value of the preset optimal pressure threshold.

[0052] After completing the above process, the centralized fuel supply system establishes a steady state of fuel supply, and the multiple fuel delivery pumps in operation in the centralized fuel supply system work within their respective optimal operating conditions. When the number and flow rate of the incinerator's oil points change, the opening adjustment of the reflux flow control valve cannot satisfy the pressure of the fuel delivery manifold within the optimal pressure threshold range preset by the control system, and the original fuel supply balance is broken. The centralized fuel supply system will re-establish the fuel supply balance by changing the number of operating fuel delivery pumps.

[0053] A typical embodiment and application scenario of a centralized fuel supply control method for an incinerator described in an embodiment of the present invention are as follows:

[0054] In a sludge incineration disposal project, two incinerators are centrally arranged. Each incinerator is equipped with 6 diesel spray guns and 1 diesel burner along the circumferential direction. Since the actual amount and calorific value of waste entering the furnace are not uniform, the number of spray guns activated and the combustion load of the burner are different for each incinerator. The demand parameters for diesel at different oil points in different periods and different incinerators are also different. According to calculations, the two incinerators have a total of 14 oil points, and the short-term maximum demand flow rate for diesel is about 23m 3 / h, the minimum demand is 0. In order to save land for project construction and reduce investment in project equipment, the project adopts a centralized diesel supply system for incinerators, specifically:

[0055] One diesel storage tank and eight diesel delivery pumps are set up. Necessary pipelines, pipe fittings and valves are set up at the outlet of each diesel delivery pump and connected to the inlet of the diesel delivery manifold. A flow detection device and a pressure detection device are set on the diesel delivery manifold. A diesel return pipe is led out from the diesel delivery manifold. A reflux flow regulating valve is set on the diesel return pipe. The end of the diesel delivery manifold is connected to the burner and diesel spray gun of each incinerator.

[0056] Among them, 8 diesel delivery pumps use the same type of centrifugal pumps, and their working performance curves characterized by clean water medium are as follows: Figure 3 As shown, the flow rate at the selected operating point is Q0 = 3m 3 / h, the allowable fluctuation threshold Q'=0.4m3 / h, then Q0±Q'=3m 3 / h±0.4m 3 / h, that is, the optimal flow range is 2.6m 3 / h~3.4m 3 / h. The design diesel delivery manifold delivery pressure control value is P0 = 39m water column, P' = 4m water column, then P0 ± P' = 39m water column ± 4m water column, converted to a pressure unit of 382kPa ± 39kPa, then the diesel delivery manifold delivery pressure control range is 343kPa ~ 422kPa.

[0057] When the incinerator is started, the diesel burner needs to be activated for ignition and heating. The diesel demand of the burner during a certain heating period is 18.6m 3 / h. The control system receives the diesel demand signal, starts the diesel delivery pumps one by one, and monitors the pressure value on the diesel delivery manifold in real time. As the number of diesel delivery pumps increases, the diesel delivery pressure of the diesel delivery manifold gradually increases. When 6 diesel delivery pumps are started, the delivery pressure of the diesel delivery manifold rises to 380kPa, which is within the design operating pressure range. The control system reads that the flow rate of the diesel delivery manifold is 18.1m 3 / h, the control system determines 6*2.6m 3 / h<18.1m 3 / h<6*3.4m 3 / h, that is, the diesel flow in the diesel delivery manifold is within the design flow range of the 6 diesel delivery pumps, and the control system maintains the reflux flow regulating valve in the closed state.

[0058] When the incinerator is running, the two incinerators put in a certain amount of dried sludge of calorific value, which can basically maintain self-sustaining combustion in the furnace, and only 1-2 diesel spray guns are opened in a few cases. When the sludge is self-sustaining in the furnace without the need for fuel replenishment, the control system does not receive the diesel demand signal, and all diesel delivery pumps are in the closed state; when the incinerator needs 4m diesel 3 / h to supplement the furnace heat load, two spray guns are put into operation, the diesel centralized supply system receives the demand signal, and the control system continuously starts two diesel delivery pumps. The diesel delivery pressure of the diesel delivery manifold is 409kPa, which is within the design range. At this time, the delivery flow rate of the diesel delivery manifold is 4.4m 3 / h<2*2.6m 3 / h, the control system opens the reflux flow delivery valve and adjusts its opening to make the diesel delivery manifold pressure infinitely close to 382kPa, and the reflux flow regulating valve is maintained at around 70% opening;

[0059] When the calorific value of the sludge fed into the incinerator fluctuates, the diesel demand of the incinerator drops to 2m 3 / h, the incinerator only uses one diesel spray gun. The control system detects that the pressure of the diesel delivery manifold changes, and it continues to increase beyond the optimal working range of 343kPa to 422kPa preset by the control system. The control system shuts down one of the diesel delivery pumps and the reflux regulating valve, and the pressure of the diesel delivery manifold drops to 409kPa. At this time, the flow monitoring value of the diesel delivery manifold is 2.3m 3 / h, less than the optimal threshold lower limit of 2.6m 3 / h, the control system starts and adjusts the diesel reflux flow to make the manifold pressure approach the middle value of the preset threshold of 382kPa.

[0060] It should be noted that this patent does not show the pipelines, pipe fittings and valves at the outlet of a single fuel delivery pump. The fuel return pipe of the incinerator's centralized fuel supply system is led out from the fuel delivery manifold. An independent centrifugal pump minimum return line can still be set at the outlet of the fuel delivery pump, and its function is different from and does not conflict with the fuel return pipe where the reflux regulating valve is located.

[0061] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0062] In addition, it will be understood by those skilled in the art that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0063] It will be appreciated by those skilled in the art that, although the present invention has been described with reference to exemplary embodiments, various changes may be made and equivalents may be substituted for its elements without departing from the scope of the present invention. In addition, many modifications may be made to adapt specific circumstances or materials to the teachings of the present invention without departing from the essential scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but the present invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A method for controlling the centralized supply of fuel oil to an incinerator, characterized in that: The method includes multiple fuel delivery pumps, the outlets of the multiple fuel delivery pumps are connected to a fuel delivery manifold, a pressure detection device and a flow detection device are arranged on the fuel delivery manifold, a fuel return pipe is led out from the fuel delivery manifold, a return flow regulating valve is arranged on the fuel return pipe, and the end of the fuel delivery manifold is connected to multiple incinerator oil points. The specific control method includes the following contents: Step 1: Enter the flow value Q0 of the optimal operating point of a single fuel delivery pump, the flow fluctuation threshold Q' of the optimal operating point of a single fuel delivery pump, enter the fuel delivery manifold delivery pressure control value P0, the fuel delivery manifold delivery pressure control fluctuation threshold P', define the delivery flow range Q0±Q' of the optimal operating point of a single fuel delivery pump, and the fuel delivery manifold delivery pressure control range P0±P', When the incinerator is detected to have a demand for fuel, the centralized fuel supply system is automatically started; Step 2, start the fuel delivery pumps one by one, and simultaneously monitor the fuel delivery pressure P1 of the fuel delivery manifold at the fuel delivery pump outlet. When P1 reaches the fuel delivery manifold delivery pressure control range P0±P', maintain the start number N of the existing fuel delivery pumps; Step 3: read the fuel delivery flow Q1 of the fuel delivery manifold, and simultaneously read the number of fuel delivery pump startups N, compare the sum of the optimal operating point flow rates of all running fuel delivery pumps N*(Q0±Q') with the actually detected fuel delivery flow Q1 of the fuel delivery manifold, and adjust the number of running fuel delivery pumps and the opening of the reflux flow regulating valve according to the comparison result: If N*(Q0-Q')<Q1<N*(Q0+Q'), the reflux regulating valve remains closed; If Q1<N*(Q0-Q'), the reflux flow control valve is opened, and a PID adjustment mechanism is established between the reflux flow control valve opening and P1 to make P1 approach P0; If Q1>N*(Q0+Q'), then shut down a running fuel delivery pump, open the reflux flow regulating valve at the same time, and establish a PID regulation mechanism between the reflux flow regulating valve opening and P1 to make P1 approach P0; Step 4: The centralized fuel supply system reaches a balance and maintains the operating state; Step 5: When the number and flow rate of the incinerator's oil points change, the centralized fuel supply system can automatically adjust to meet the changes in the incinerator's fuel demand, specifically: When the fuel demand of the incinerator changes, the control system first detects that the fuel delivery pressure of the fuel delivery manifold at the fuel delivery pump outlet changes to P1'. The control system adjusts the start or stop of the fuel delivery pump according to the changed P1' value to make P1' reach the fuel delivery manifold delivery pressure control range P0±P'; The control system reads the fuel delivery flow rate of the fuel delivery manifold at this time as Q1' and the latest number of fuel delivery pump operations N', compares N'*(Q0±Q') with Q1', and adjusts the number of fuel delivery pump operations and the opening of the reflux flow regulating valve according to the method described in step 3; The centralized fuel supply system establishes a new equilibrium state and maintains this state until the next change in the fuel demand of the incinerator.

2. A method for controlling the centralized supply of fuel oil to an incinerator according to claim 1, characterized in that: The optimal operating point flow rate of the fuel delivery pump and the fuel delivery pipe delivery pressure control value are determined by the working performance curve of the fuel delivery pump and the layout of the fuel delivery pump outlet pipeline and equipment.

3. The method for controlling the centralized supply of fuel oil to an incinerator according to claim 1, characterized in that: The number of fuel delivery pumps and the regulating capacity of the fuel return flow regulating valve shall meet the continuous regulation requirements of the minimum and maximum fuel consumption of all incinerator oil consumption points, and the number of fuel delivery pumps shall be no less than three, with the same or different specifications.

4. The method for controlling the centralized supply of fuel oil to an incinerator according to claim 1, characterized in that: The centralized fuel supply system supplies fuel to multiple incinerator fuel points with different fuel demands, and the usage time and usage flow of each incinerator fuel point vary randomly.

5. The method for controlling the centralized supply of fuel oil to an incinerator according to claim 1, characterized in that: Necessary pipes and valves are installed in front of the incinerator oil points to meet the fuel supply pressure requirements of different incinerator oil points.

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