Natural gas flow proportion control system for combustion chamber of zinc rectifying furnace

Abstract

The invention discloses a natural gas flow proportion control system for a combustion chamber of a zinc rectifying furnace. The natural gas flow proportion control system comprises a flow monitoring module, a flow control module and an execution module. The flow monitoring module monitors the real-time natural gas flow in a natural gas pipeline and transmits the real-time natural gas flow data to the flow control module; and the flow control module is internally provided with a set target natural gas flow ratio, and the flow control module obtains a real-time natural gas flow ratio according to the real-time natural gas flow data. The real-time natural gas flow proportion is obtained through the PLC, the natural gas flow proportion in the branch natural gas pipeline of the combustion chamber is rapidly adjusted according to the target natural gas flow proportion, accurate control over the natural gas flow proportion is achieved, and therefore complete combustion of gas in the furnace is promoted, and the combustion efficiency of natural gas is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical equipment, and in particular to a natural gas flow ratio control system of a combustion chamber of a tower zinc rectification furnace. Background Art

[0002] As a key equipment in the pyrometallurgical zinc smelting process, the tower zinc distillation furnace uses the principle of continuous fractionation to separate the impurity metals (mainly lead, iron, cadmium, etc.) in crude zinc according to the different boiling points of the metals to obtain refined zinc or 1-3 grade zinc. It has the advantages of high zinc purity, strong raw material adaptability, and the ability to enrich other metals at the same time. In the zinc distillation furnace, the combustion chamber is an important part, which is responsible for providing high temperature conditions to promote the evaporation of zinc in the crude zinc metal liquid and separate it from other impurity metals, thereby achieving the purpose of purifying zinc metal.

[0003] The existing tower zinc rectification furnace combustion chamber has an inappropriate ratio of the imported natural gas volume between the first and second layers, which easily causes incomplete combustion of the natural gas and low natural gas combustion efficiency. Summary of the invention

[0004] In view of the problems existing in the combustion chamber of a tower zinc fractionation furnace, the present invention provides a natural gas flow ratio control system for the combustion chamber of a tower zinc fractionation furnace, which at least solves one problem existing in the prior art and has the characteristics of promoting complete combustion of gas in the furnace and improving the combustion efficiency of natural gas.

[0005] To achieve the above object, the technical solution adopted by the present invention is: adopting a natural gas flow ratio control system of a zinc distillation furnace combustion chamber, including a zinc distillation furnace combustion chamber including a combustion chamber and a natural gas pipeline, including a flow monitoring module, a flow control module and an execution module;

[0006] The flow monitoring module monitors the real-time natural gas flow in the natural gas pipeline and transmits the real-time natural gas flow data to the flow control module;

[0007] The flow control module has a built-in target natural gas flow ratio. The flow control module obtains the real-time natural gas flow ratio according to the real-time natural gas flow data, obtains the adjustment data of the natural gas flow according to the real-time natural gas flow ratio and the target natural gas flow ratio, and generates a control instruction. The flow control module outputs the control instruction to the execution module;

[0008] The execution module receives the control instruction and adjusts the natural gas flow in the natural gas pipeline according to the control instruction.

[0009] Furthermore, the natural gas pipeline includes a branch natural gas pipeline, the branch natural gas pipeline includes a first-layer natural gas pipeline and a second-layer natural gas pipeline, the flow monitoring module includes a first-layer natural gas flow sensor and a second-layer natural gas flow sensor, the first-layer natural gas flow sensor is arranged in the first-layer natural gas pipeline, the first-layer natural gas flow sensor monitors the real-time natural gas flow in the first-layer natural gas pipeline, the second-layer natural gas flow sensor is arranged in the second-layer natural gas pipeline, the second-layer natural gas flow sensor monitors the real-time natural gas flow in the second-layer natural gas pipeline.

[0010] Furthermore, the flow control module adopts a PLC controller, which processes the received real-time natural gas flow data through the PLC controller to obtain the real-time natural gas flow ratio of the branch natural gas pipeline, compares the natural gas flow ratio with the target natural gas flow ratio, obtains the adjustment data of the natural gas flow, generates corresponding control instructions and outputs the control instructions to the execution module, and the execution module receives the control instructions to adjust the natural gas flow of the branch natural gas pipeline so that the real-time natural gas flow ratio reaches the target natural gas flow ratio.

[0011] Furthermore, the execution module includes a first-layer natural gas flow regulating valve and a second-layer natural gas flow regulating valve, the first-layer natural gas flow regulating valve is arranged in the first-layer natural gas pipeline, and the second-layer natural gas flow regulating valve is arranged in the second-layer natural gas pipeline, and the first-layer natural gas flow regulating valve and the second-layer natural gas flow regulating valve respectively adjust the flow cross-section of natural gas in the first-layer natural gas pipeline and the second-layer natural gas pipeline according to the control instructions of the PLC controller.

[0012] Furthermore, the target natural gas flow ratio is the natural gas flow ratio of the first-layer natural gas pipeline and the second-layer natural gas pipeline, and the target natural gas flow ratio is set to 1.5:1.

[0013] Furthermore, the sampling times of the flow monitoring module are fed back through the relative measurement error. The flow measurement cycle is divided into two stages. The first stage is the relative measurement error calculation stage, and the second stage is the sampling times adjustment stage. The sampling times of the second stage are adjusted by the relative measurement error calculated in the first stage. After the sampling times adjustment of the second stage is completed, the flow data measured in this stage are calculated to obtain the final flow size.

[0014] Furthermore, the calculation formula of the relative measurement error is:

[0015]

[0016]

[0017]

[0018] The average flow rate measured in the first stage;

[0019] q i : The flow rate of the ith sampling in the 20 samplings in the first stage, q min With q max are the minimum and maximum flow rates in the 20 samplings in the first stage;

[0020] The average error of the first stage measurement;

[0021] q' i : The size of the i-th sampling flow rate in the 18 samplings except the minimum sampling flow rate and the maximum sampling flow rate in the first stage;

[0022] τ c : Relative measurement error.

[0023] Furthermore, the calculation formula for the sampling adjustment times is:

[0024]

[0025] τ0: initial relative measurement error, τ0 is 0.05;

[0026] n: sampling adjustment times, which is an integer based on the calculation result. The maximum sampling adjustment times shall not exceed 240 times.

[0027] Furthermore, the calculation formula of the final measured flow rate is:

[0028]

[0029] Final measured flow

[0030] q″ i : The size of the i-th sampling flow in the sampling flow except the minimum sampling flow and the maximum sampling flow in the second stage.

[0031] Furthermore, the natural gas flow rate proportional control uses a proportional scaling rate to provide feedback on the control adjustment time. The proportional scaling rate of the natural gas flow rate and the control adjustment time calculation formula are:

[0032] Q n =1-T n / T n0

[0033]

[0034] T n : Control adjustment time of natural gas flow ratio;

[0035] Q n : Scaling ratio of natural gas flow rate;

[0036] T n0 : Initial adjustment time of natural gas flow ratio, 120 minutes;

[0037] R n1 : After the system adjusts the control execution module, the PLC controller first calculates the real-time natural gas flow data monitored by the flow monitoring module to obtain the real-time natural gas flow ratio of the branch natural gas pipeline. During the control adjustment time, the PLC controller calculates the real-time natural gas flow ratio of the real-time natural gas flow data every 20 minutes;

[0038] R n2 : Before the system adjusts the natural gas flow ratio, the PLC controller calculates the real-time natural gas flow data to obtain the natural gas flow ratio for the last time. During the control adjustment time, the PLC controller calculates the natural gas flow ratio of the real-time natural gas flow data once every 20 minutes.

[0039] In summary, the present invention is beneficial in that:

[0040] The combustion chamber natural gas flow ratio control system of the present invention monitors the natural gas flow of the branch natural gas pipeline in real time, obtains the real-time natural gas flow ratio through the PLC controller, and quickly adjusts the natural gas flow ratio in the branch natural gas pipeline of the combustion chamber according to the target natural gas flow ratio, thereby achieving precise control of the natural gas flow ratio, thereby promoting the complete combustion of the gas in the furnace and improving the combustion efficiency of the natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the natural gas flow ratio control system of the present invention.

[0042] Figure 2 It is a schematic diagram of the positions of the natural gas flow sensor and the flow regulating valve of the present invention.

[0043] Figure 3 It is a schematic diagram of the monitoring cross section of the present invention.

[0044] Figure 4 It is the velocity vector diagram of the section c1 of the combustion chamber at different flow ratios of natural gas in the present invention.

[0045] Figure 5 It is the temperature distribution cloud diagram of the cross section l1 of the combustion chamber at different flow ratios of natural gas in the present invention.

[0046] Figure 6 It is the temperature distribution cloud diagram of the outer wall of the combustion chamber tray when the natural gas has different flow ratios in the present invention.

[0047] Figure 7a This is a graph showing changes in the overall average heat flux density of the outer wall of the tower plate at different natural gas flow ratios of the present invention.

[0048] Figure 7b This is a graph showing the change in total heat transfer capacity of the tower plate at different natural gas flow ratios according to the present invention.

[0049] Figure 8a This is a graph showing the change in the local average heat flux density of the tower plate at different natural gas flow ratios of the present invention.

[0050] Figure 8b This is a graph showing the change in the local average temperature of the tower plate at different natural gas flow ratios of the present invention.

[0051] Figure numerals: combustion chamber 1, natural gas pipeline 3, natural gas main pipeline 30, first-layer natural gas pipeline 31, second-layer natural gas pipeline 32, first-layer natural gas flow sensor 51, second-layer natural gas flow sensor 52, first-layer natural gas flow regulating valve 53, second-layer natural gas flow regulating valve 54. DETAILED DESCRIPTION

[0052] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0053] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0054] All directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, horizontal, vertical...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0055] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of the present invention may actually be an approximately parallel relationship, and the vertical relationship may actually be an approximately vertical relationship.

[0056] Embodiment 1:

[0057] like Figure 1 As shown, a natural gas flow ratio control system of a zinc distillation furnace combustion chamber of the present invention, the zinc distillation furnace combustion chamber comprises a combustion chamber 1 and a natural gas pipeline 3, natural gas is introduced into the combustion chamber 1 through the natural gas pipeline 3, the control system comprises a flow monitoring module, a flow control module and an execution module, the flow monitoring module and the execution module are connected with the flow control module, the flow control module has a built-in set target natural gas flow ratio, the flow monitoring module and the execution module are arranged in the natural gas pipeline 3, the flow monitoring module monitors the natural gas flow in the natural gas pipeline 3 and transmits real-time natural gas flow data to the flow control module, the flow control module obtains the real-time natural gas flow ratio according to the real-time natural gas flow data, and obtains the adjustment data of the natural gas flow according to the real-time natural gas flow ratio and the target natural gas flow ratio, the flow control module outputs a control instruction to the execution module, and the execution module adjusts the natural gas flow in the natural gas pipeline 3 according to the control instruction.

[0058] The natural gas pipeline 3 includes a natural gas main pipeline 30 and branch natural gas pipelines. The branch natural gas pipelines include a first-layer natural gas pipeline 31 and a second-layer natural gas pipeline 32. The inlet ends of the first-layer natural gas pipeline 31 and the second-layer natural gas pipeline 32 are respectively connected to the natural gas main pipeline 30, and the outlet ends are connected to the combustion chamber 1. Natural gas passes through the natural gas main pipeline 30 and the first-layer natural gas pipeline 31 and the second-layer natural gas pipeline 32 into the combustion chamber 1.

[0059] The flow monitoring module includes a first-layer natural gas flow sensor 51 and a second-layer natural gas flow sensor 52. The first-layer natural gas flow sensor 51 is arranged on the first-layer natural gas pipeline 31, and the first-layer natural gas flow sensor 51 monitors the real-time natural gas flow in the first-layer natural gas pipeline 31. The second-layer natural gas flow sensor 52 is arranged on the second-layer natural gas pipeline 32, and the second-layer natural gas flow sensor 52 monitors the real-time natural gas flow in the second-layer natural gas pipeline 32.

[0060] The flow control module adopts a PLC controller, which processes the received real-time natural gas flow data through the PLC controller to obtain the real-time natural gas flow ratio of the branch natural gas pipeline, compares the natural gas flow ratio with the target natural gas flow ratio, obtains the adjustment data of the natural gas flow, generates corresponding control instructions and outputs the control instructions to the execution module. The execution module receives the control instructions to adjust the natural gas flow of the branch natural gas pipeline, and continuously cycles the entire adjustment process until the real-time natural gas flow ratio of the branch natural gas pipeline monitored by the flow monitoring module reaches the target natural gas flow ratio.

[0061] The execution module includes a first-layer natural gas flow regulating valve 53 and a second-layer natural gas flow regulating valve 54. The first-layer natural gas flow regulating valve 53 is arranged on the first-layer natural gas pipeline 31, and the second-layer natural gas flow regulating valve 54 is arranged on the second-layer natural gas pipeline 32. The first-layer natural gas flow regulating valve 53 and the second-layer natural gas flow regulating valve 54 respectively adjust the flow cross-section of the natural gas in the first-layer natural gas pipeline 31 and the second-layer natural gas pipeline 32 according to the control instructions of the PLC controller to realize the flow control.

[0062] The main process of the present invention using the control system to adjust the natural gas flow in the branch natural gas pipeline of the zinc rectification furnace is:

[0063] First, the set target natural gas flow ratio is input into the PLC controller, the flow monitoring module monitors the real-time natural gas flow data of the branch natural gas pipeline, and transmits the data to the PLC controller, the PLC controller obtains the adjustment data of the natural gas flow of the branch natural gas pipeline according to the real-time natural gas flow data and the target natural gas flow ratio, and generates a control instruction at the same time, the PLC controller transmits the control instruction to the execution module, the execution module receives the control instruction and adjusts the flow section of the natural gas in the branch natural gas pipeline, and then adjusts the natural gas flow entering the combustion chamber through the first layer natural gas pipeline 31 and the second layer natural gas pipeline 32, and the whole adjustment process is continuously repeated until the natural gas flow ratio of the first layer natural gas pipeline 31 and the second layer natural gas pipeline 32 reaches the target natural gas flow ratio.

[0064] The target natural gas flow ratio is the natural gas flow ratio of the first-layer natural gas pipeline 31 and the second-layer natural gas pipeline 32, and the target natural gas flow ratio is set to 1.5:1.

[0065] The target natural gas flow ratio is obtained by conducting comprehensive thermal tests on the zinc distillation furnace and applying numerical simulation technology. The natural gas flow ratio plays an important role in the combustion process of natural gas in the combustion chamber of the zinc distillation furnace. A suitable natural gas flow ratio will promote the complete combustion of the gas in the furnace and improve the combustion efficiency of natural gas. Therefore, the present invention sets the target natural gas flow ratio to 1.5:1.

[0066] See also Figure 3 In order to analyze the distribution law of multi-physical fields in the combustion chamber of the tower zinc distillation furnace, a monitoring section c1 parallel to the bottom of the combustion chamber is cut in the natural gas burner, and a monitoring section l1 parallel to the east and west sides of the combustion chamber is cut in the combustion chamber. At the same time, the outer wall of the tower plate is also used as the monitoring surface.

[0067] Regarding the influence of the natural gas flow ratio on the natural gas combustion in the combustion chamber in this embodiment, this embodiment performs the following analysis:

[0068] In this embodiment, commercial simulation software is used to qualitatively and quantitatively analyze the combustion chamber operating conditions under different natural gas flow ratios (the natural gas flow ratio increases from 0.515:1 to 2.33:1, and four adjustment conditions are taken, namely 0.515:1, 1:1, 1.5:1, and 2.33:1). At the same time, in order to evaluate the combustion effects of different natural gas flow ratios, the natural gas velocity field, temperature field, average heat flux density of the tower plate, and total heat transfer in the combustion chamber are selected as evaluation indicators.

[0069] Results Analysis

[0070] from Figure 4 It can be seen that as the proportion of natural gas flow in the first-layer natural gas pipeline 31 increases, the gas velocity at the mouth of the first-layer natural gas pipeline 31 increases significantly, among which the airflow velocity of the burner on the south side (i.e., the burner at the far inlet end) is slightly larger. However, the velocity distribution law in the entire c1 section is not much different. The airflow velocity in the north and south sides of the tower plate is relatively large, accompanied by vortex structures. In addition, when the natural gas flow in the first-layer natural gas pipeline 31 increases, the overall average velocity of the c1 section increases slowly, which increases the degree of turbulence in the middle and upper part of the furnace, which is conducive to the mixed combustion of natural gas.

[0071] from Figure 5 It can be seen that the temperature distribution of the four adjustment conditions is similar, and only the high temperature area in the middle and lower part of the furnace is different. As the proportion of natural gas flow in the second-layer natural gas pipeline 32 decreases, the area of ​​the low temperature area in the middle and lower part decreases.

[0072] from Figure 6 It can be seen that by increasing the proportion of natural gas flow in the first-layer natural gas pipeline 31, the maximum temperature of the tower plate wall increases from 1540K to 1550K.

[0073] By comparing different natural gas flow ratios, it can be seen that as the natural gas flow of the first layer natural gas pipeline 31 increases, the high temperature area of ​​the upper tray gradually increases, but the temperature of the lower tray decreases slightly. When the natural gas flow ratio of the first layer natural gas pipeline 31 to the second layer natural gas pipeline 32 reaches 1:1, a high temperature area can also be formed on the lower tray.

[0074] According to the qualitative analysis of the simulation results of the temperature field of the combustion chamber and the tray wall at different natural gas flow ratios, it can be preliminarily concluded that the combustion heat transfer behavior of natural gas in the combustion chamber of the zinc distillation furnace reaches a relatively good level when the natural gas flow ratio is 1.5:1. In order to further clarify the relevant conclusions, the adjustment conditions under different natural gas flow ratios are quantitatively analyzed based on key parameters such as natural gas flow ratio, average heat flux density on the outer wall of the tray, and total heat transfer.

[0075] As can be seen from Figure 7, the average heat flux density and total heat transfer of the outer wall of the tower plate change in a similar manner with the natural gas flow ratio. Compared with the baseline working condition (conventional working condition), the key parameters of the adjusted working condition have been greatly improved. With the increase of the natural gas flow of the first-layer natural gas pipeline 31, the average heat flux density and total heat transfer of the tower plate increase slowly. When the natural gas flow ratio of the first-layer natural gas pipeline 31 to the second-layer natural gas pipeline 32 reaches 1.5:1, the key parameters of the tower plate no longer increase.

[0076] As can be seen from Figure 8, the variation patterns of the average heat flux density and the average temperature in the local area of ​​the tray wall are generally similar. With the increase of the natural gas flow rate of the first-layer natural gas pipeline 31, the key parameters of the upper tray all show a trend of first increasing and then decreasing, while those of the lower tray decrease slightly and then gradually stabilize.

[0077] Combined with the above analysis, it can be seen that increasing the proportion of natural gas flow in the first-layer natural gas pipeline 31 is conducive to improving the furnace condition, while too large a flow ratio will lead to poor improvement effects. The target natural gas flow ratio is about 1.5:1, and the natural gas flow in the first-layer natural gas pipeline 31 should not be too large. In addition, reducing the proportion of natural gas flow in the second-layer natural gas pipeline 32 has little effect on the furnace condition of the lower combustion chamber.

[0078] Furthermore, in order to more accurately obtain the flow data of the above-mentioned pipeline that needs to be monitored and reduce the impact of flow velocity fluctuations in the pipeline, the relative measurement error is used to provide feedback on the sampling times of the flow monitoring module, and the system adjusts the sampling times of the flow monitoring module based on the relative measurement error. The flow measurement cycle can be divided into two stages. The first stage is the relative measurement error calculation stage, which lasts for 2 seconds and has 20 sampling times; the second stage is the sampling times adjustment stage, which lasts for 8 seconds. The sampling times of the second stage are adjusted by the relative measurement error calculated in the first stage. When the relative measurement error exceeds the set threshold, the larger the relative measurement error, the more sampling times the flow monitoring module has. After the sampling times adjustment of the second stage is completed, the flow data measured in this stage is calculated to obtain the final flow size. The calculation formula for the relative measurement error, the sampling adjustment times, and the final measured flow can be:

[0079] ①Relative measurement error

[0080]

[0081]

[0082]

[0083] The average flow rate measured in the first stage;

[0084] q i : The flow rate of the ith sampling in the 20 samplings in the first stage, q min With q max are the minimum and maximum flow rates in the 20 samplings in the first stage;

[0085] The average error of the first stage measurement;

[0086] q' i : The size of the i-th sampling flow rate in the 18 samplings except the minimum sampling flow rate and the maximum sampling flow rate in the first stage;

[0087] τ c : Relative measurement error.

[0088] ②Sampling adjustment times

[0089]

[0090] τ0: initial relative measurement error, τ0 is 0.05;

[0091] n: sampling adjustment times, which is an integer based on the calculation result. The maximum sampling adjustment times shall not exceed 240 times.

[0092] ③Final measured flow

[0093]

[0094] Final measured flow

[0095] q" i : The size of the i-th sampling flow in the sampling flow except the minimum sampling flow and the maximum sampling flow in the second stage;

[0096] Furthermore, in order to better control the natural gas flow ratio of the branch natural gas pipeline and reduce the control cost, the proportional scaling rate is used to provide feedback on the control adjustment time. The system determines whether to adjust the flow control module and execution module that control the natural gas flow ratio based on the size of the proportional scaling rate. When the proportional scaling rate exceeds the set threshold, the control adjustment time is corrected. The larger the proportional scaling rate, the shorter the control adjustment time. Therefore, the above ratio can be adjusted in time to achieve accurate control. The proportional scaling rate is set for the natural gas flow ratio to achieve the adjustment of the above ratio. The formula for calculating the proportional scaling rate and control adjustment time of the natural gas flow ratio can be:

[0097] Q n =1-T n / T n0

[0098]

[0099] T n : Control adjustment time of natural gas flow ratio

[0100] Q n : Scaling ratio of natural gas flow rate.

[0101] T n0 : Initial adjustment time of natural gas flow ratio, 120 minutes.

[0102] R n1 : After the system adjusts the control execution module, the PLC controller first calculates the real-time natural gas flow data monitored by the flow monitoring module to obtain the real-time natural gas flow ratio of the branch natural gas pipeline. During the control adjustment time, the PLC controller calculates the real-time natural gas flow ratio of the real-time natural gas flow data once every 20 minutes.

[0103] R n2 : Before the system adjusts the natural gas flow ratio, the PLC controller calculates the real-time natural gas flow data to obtain the natural gas flow ratio for the last time. During the control adjustment time, the PLC controller calculates the natural gas flow ratio of the real-time natural gas flow data once every 20 minutes.

[0104] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

Claims

1. A natural gas flow ratio control system for a zinc distillation furnace combustion chamber, the zinc distillation furnace combustion chamber comprising a combustion chamber and a natural gas pipeline, characterized in that: It includes a flow monitoring module, a flow control module and an execution module; The flow monitoring module monitors the real-time natural gas flow in the natural gas pipeline and transmits the real-time natural gas flow data to the flow control module; The flow control module has a built-in target natural gas flow ratio. The flow control module obtains the real-time natural gas flow ratio according to the real-time natural gas flow data, obtains the adjustment data of the natural gas flow according to the real-time natural gas flow ratio and the target natural gas flow ratio, and generates a control instruction. The flow control module outputs the control instruction to the execution module; The execution module receives the control instruction and adjusts the natural gas flow in the natural gas pipeline according to the control instruction.

2. The natural gas flow rate proportional control system of a zinc rectification furnace combustion chamber according to claim 1, characterized in that: The natural gas pipeline includes a branch natural gas pipeline, the branch natural gas pipeline includes a first-layer natural gas pipeline and a second-layer natural gas pipeline, the flow monitoring module includes a first-layer natural gas flow sensor and a second-layer natural gas flow sensor, the first-layer natural gas flow sensor is arranged in the first-layer natural gas pipeline, the first-layer natural gas flow sensor monitors the real-time natural gas flow in the first-layer natural gas pipeline, the second-layer natural gas flow sensor is arranged in the second-layer natural gas pipeline, the second-layer natural gas flow sensor monitors the real-time natural gas flow in the second-layer natural gas pipeline.

3. The natural gas flow rate proportional control system of the combustion chamber of a zinc rectification furnace according to claim 2, characterized in that: The flow control module adopts a PLC controller, which processes the received real-time natural gas flow data through the PLC controller to obtain the real-time natural gas flow ratio of the branch natural gas pipeline, compares the natural gas flow ratio with the target natural gas flow ratio, obtains the adjustment data of the natural gas flow, generates corresponding control instructions and outputs the control instructions to the execution module, and the execution module receives the control instructions to adjust the natural gas flow of the branch natural gas pipeline so that the real-time natural gas flow ratio reaches the target natural gas flow ratio.

4. The natural gas flow rate proportional control system of a zinc rectification furnace combustion chamber according to claim 2, characterized in that: The execution module includes a first-layer natural gas flow regulating valve and a second-layer natural gas flow regulating valve. The first-layer natural gas flow regulating valve is arranged in the first-layer natural gas pipeline, and the second-layer natural gas flow regulating valve is arranged in the second-layer natural gas pipeline. The first-layer natural gas flow regulating valve and the second-layer natural gas flow regulating valve respectively adjust the flow cross-section of natural gas in the first-layer natural gas pipeline and the second-layer natural gas pipeline according to the control instructions of the PLC controller.

5. The natural gas flow rate proportional control system of the combustion chamber of a zinc rectification furnace according to claim 2, characterized in that: The target natural gas flow ratio is the natural gas flow ratio of the first-layer natural gas pipeline and the second-layer natural gas pipeline, and the target natural gas flow ratio is set to 1.5:

1.

6. The natural gas flow rate proportional control system of a zinc rectification furnace combustion chamber according to claim 1, characterized in that: The sampling times of the flow monitoring module are fed back through the relative measurement error. The flow measurement cycle is divided into two stages. The first stage is the relative measurement error calculation stage, and the second stage is the sampling times adjustment stage. The sampling times of the second stage are adjusted by the relative measurement error calculated in the first stage. After the sampling times adjustment of the second stage is completed, the flow data measured in this stage are calculated to obtain the final flow size.

7. The natural gas flow rate proportional control system of the combustion chamber of a zinc rectification furnace according to claim 6, characterized in that: The calculation formula of the relative measurement error is: The average flow rate measured in the first stage; q i : The flow rate of the ith sampling in the 20 samplings in the first stage, q min With q max are the minimum and maximum flow rates in the 20 samplings in the first stage; The average error of the first stage measurement; q' i : The size of the i-th sampling flow rate in the 18 samplings except the minimum sampling flow rate and the maximum sampling flow rate in the first stage; τ c : Relative measurement error.

8. A natural gas flow rate proportional control system for a zinc rectification furnace combustion chamber according to claim 6, Features: The calculation formula for the sampling adjustment times is: τ0: initial relative measurement error, τ0 is 0.05; n: sampling adjustment times, which is an integer based on the calculation result. The maximum sampling adjustment times shall not exceed 240 times.

9. A natural gas flow rate proportional control system for a zinc rectification furnace combustion chamber according to claim 6, Features: The calculation formula of the final measured flow rate is: Final measured flow q" i : The size of the i-th sampling flow in the sampling flow except the minimum sampling flow and the maximum sampling flow in the second stage.

10. The natural gas flow rate proportional control system of the combustion chamber of a zinc rectification furnace according to claim 1, Features: The natural gas flow rate proportional control uses the proportional scaling rate to provide feedback on the control adjustment time. The natural gas flow rate proportional scaling rate and the control adjustment time calculation formula are: Q n =1-T n / T n0 T n : Control adjustment time of natural gas flow ratio; Q n : Scaling ratio of natural gas flow rate; T n0 : Initial adjustment time of natural gas flow ratio, 120 minutes; R n1 : After the system adjusts the control execution module, the PLC controller first calculates the real-time natural gas flow data monitored by the flow monitoring module to obtain the real-time natural gas flow ratio of the branch natural gas pipeline. During the control adjustment time, the PLC controller calculates the real-time natural gas flow ratio of the real-time natural gas flow data every 20 minutes; R n2 : Before the system adjusts the natural gas flow ratio, the PLC controller calculates the real-time natural gas flow data to obtain the natural gas flow ratio for the last time. During the control adjustment time, the PLC controller calculates the natural gas flow ratio of the real-time natural gas flow data once every 20 minutes.

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