Method and system for exploiting sulfur-containing natural gas field by using common compressor

Abstract

The invention belongs to the technical field of natural gas exploitation, and provides a method and system for exploiting a sulfur-containing natural gas field by using a common compressor. The system comprises a common compressor, an industrial control cabinet and a background server communicating with the industrial control cabinet, the gas inlet end of the common compressor is connected with a desulfurizing agent reactor, the gas inlet end of the desulfurizing agent reactor is connected with a wellhead low-pressure gas conveying pipeline, and an electrochemical sensor, a PH value sensor and a temperature sensor are arranged on the desulfurizing agent reactor. And the desulfurizing agent reactor is connected with a desulfurizing agent spraying device controlled by the industrial control cabinet. A desulfurizing agent reactor is arranged at the gas inlet end of a common compressor, the desulfurizing agent reactor is provided with a desulfurizing agent filling device, low-pressure sulfur-containing natural gas is subjected to desulfurization reaction in the desulfurizing agent reactor, and the natural gas reaching the standard after desulfurization enters the common compressor. Therefore, a solution for treating the sulfur-containing natural gas by adopting a common compressor is realized, and a special sulfur-containing compressor is not needed any more.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of natural gas exploitation, and particularly relates to a method and system for exploiting a sulfur-containing natural gas field by using a common compressor. BACKGROUND

[0002] In the middle and late stages of gas field exploitation, the formation pressure decreases, and a compressor is needed to pressurize the low-pressure gas at the wellhead (which can be as low as 0.5 MPa) to the pipeline pressure (usually 6-15 MPa) to ensure that the natural gas enters the long-distance pipeline. Therefore, in natural gas exploitation, the compressor is the key equipment for maintaining the pressure of the gas field and improving the recovery rate.

[0003] For the development of a sulfur-containing natural gas field, since the natural gas contains hydrogen sulfide and other gases with strong corrosive properties, a common compressor cannot achieve safe pressurization and transportation in a strong corrosive environment. Therefore, in the prior art, the compressor for sulfur-containing natural gas mainly uses a sulfur-containing compressor. However, the cost (equipment cost / maintenance cost, etc.) of the sulfur-containing compressor is much higher than that of the common compressor, as shown in the following table:

[0004] In addition, the sulfur-containing compressor is mostly a foreign device, which has the disadvantages of technical monopoly and high premium. Therefore, there is an urgent need in the technical field for a technical solution that can apply a common compressor to the exploitation of a sulfur-containing natural gas field. SUMMARY

[0005] The purpose of the present application is to provide a method for exploiting a sulfur-containing natural gas field by using a common compressor to solve the technical problems existing in the prior art.

[0006] To achieve the above purpose, the technical solution adopted by the present application is as follows: A method for exploiting a sulfur-containing natural gas field by using a common compressor, comprising the following steps: Step S1: delivering low-pressure sulfur-containing natural gas to a desulfurizer reactor through a wellhead low-pressure gas delivery pipeline; Step S2: detecting the initial hydrogen sulfide concentration of the sulfur-containing natural gas in real time at the gas inlet end of the desulfurizer reactor and the gas flow rate ; Step S3: calculating the initial injection parameters of the desulfurizer according to the initial hydrogen sulfide concentration , the gas flow rate , and through a desulfurization reaction kinetics model, and controlling the desulfurizer injection device to inject the desulfurizer into the desulfurizer reactor according to the calculation results; wherein the initial injection parameters include: the instantaneous flow rate of the desulfurizer , the spray concentration , and the atomized particle size ;Step S4: At least one intermediate monitoring point is arranged on the desulfurizer reactor to detect the hydrogen sulfide concentration of the sulfur-containing natural gas, and an intermediate detection concentration is obtained The hydrogen sulfide concentration of the sulfur-containing natural gas is detected at the gas outlet end of the desulfurizer reactor, and a feedback detection concentration is obtained ; Step S5: The feedback detection concentration and the intermediate detection concentration are used to dynamically adjust the injection parameters of the desulfurizer injection device into the desulfurizer reactor, and control the desulfurizer injection device to inject desulfurizer into the desulfurizer reactor; Step S6: The desulfurized natural gas that meets the standard is transported to the general compressor through the gas outlet end of the desulfurizer reactor.

[0007] In a preferred embodiment, a pretreatment step is further included before the step S1: the low-pressure sulfur-containing natural gas is subjected to gas-liquid separation and / or temperature adjustment.

[0008] In a preferred embodiment, the desulfurization reaction kinetics model in the step S3 is expressed as follows:

[0009] In the formula, represents the hydrogen sulfide desulfurization reaction rate, represents the pre-exponential factor, represents the reaction activation energy, R represents the universal gas constant, and T represents the real-time temperature in the desulfurizer reactor, represents the initial hydrogen sulfide concentration, m represents the hydrogen sulfide reaction order, and P represents the PH value correction, .

[0010] In a preferred embodiment, the calculation methods of the desulfurizer instantaneous flow rate , the spray concentration and the atomization particle size in the step S3 are as follows: The desulfurizer instantaneous flow rate :

[0011] In the formula, represents the hydrogen sulfide desulfurization reaction rate, represents the volume of the desulfurizer reactor, represents the base concentration of the desulfurizer; The spray concentration :

[0012] In the formula, indicates the upper limit of the safe concentration of the desulfurizer (indicated as follows: when the inlet hydrogen sulfide concentration is high and the temperature is low, indicates the concentration adjustment coefficient, indicates the hydrogen sulfide desulfurization reaction rate, indicates the gas flow rate; the atomized particle size d:

[0013] wherein, indicates the maximum allowable particle size of the desulfurizer spray device, indicates the atomizer characteristic constant, indicates the temperature correction coefficient, T indicates the real-time temperature in the desulfurizer reactor, indicates the reference datum temperature.

[0014] In a preferred embodiment, in the step S4, the intermediate monitoring point is arranged in the 30%-60% interval of the length of the main pipe section of the desulfurizer reactor.

[0015] In a preferred embodiment, the step S5 comprises: Step S5.1: calculating the adjustment amount of the desulfurizer charging parameters according to the deviation of the intermediate detection concentration from the preset threshold value , and the deviation of the feedback detection concentration from the target concentration : the adjustment amount of the desulfurizer instantaneous flow rate :

[0016] wherein, is the flow rate adjustment gain coefficient, is the maximum allowable flow rate change value; the adjustment amount of the spray concentration : ·

[0017] the adjustment amount of the atomized particle size d :

[0018] Step S5.2: obtaining the adjusted charging parameters according to the adjustment amount obtained in the step S5.1 and the initial charging parameters, and adjusting the desulfurizer spray device to charge the desulfurizer into the desulfurizer reactor according to the adjusted charging parameters.

[0019] ​​​​In order to achieve the above object, the application further provides a system for exploiting a sulfur-containing natural gas field by using a common compressor, comprising a common compressor, an industrial control cabinet and a background server in communication with the industrial control cabinet, a desulfurizer reactor connected to the gas inlet end of the common compressor, a wellhead low-pressure gas conveying pipeline connected to the gas inlet end of the desulfurizer reactor, an electrochemical sensor, a pH value sensor and a temperature sensor arranged on the desulfurizer reactor, and a desulfurizer spraying device connected to the desulfurizer reactor and controlled by the industrial control cabinet.

[0020] In a preferred embodiment, the background server is configured with: a data acquisition module for acquiring the initial hydrogen sulfide concentration of the sulfur-containing natural gas , the gas flow , the intermediate detection concentration and the feedback detection concentration ; an initial filling parameter calculation module for calculating the initial filling parameters of the desulfurizer according to the initial hydrogen sulfide concentration , the gas flow and a desulfurization reaction kinetics model, wherein the initial filling parameters include the instantaneous flow of the desulfurizer , the spraying concentration and the atomization particle size ; a filling parameter dynamic adjustment module for dynamically adjusting the filling parameters of the desulfurizer spraying device to the desulfurizer reactor according to the feedback detection concentration and the intermediate detection concentration ; a command module for generating control commands of the desulfurizer spraying device according to the initial filling parameters and the adjusted filling parameters and transmitting the control commands to the industrial control cabinet.

[0021] In a preferred embodiment, the desulfurizer reactor comprises a main pipe part and gas inlet and outlet end parts symmetrically arranged at both ends of the main pipe part, the main pipe part, the gas inlet and outlet end parts all have inner cavities and are in an integrated structure; a desulfurizer filling part is arranged on the main pipe part, and a plurality of porous blind plates are arranged in the inner cavities of the main pipe part and the gas inlet and outlet end parts.

[0022] In a preferred embodiment, the gas inlet and outlet end parts each comprise a straight pipe part and an expansion part in an integrated structure, the expansion part is in a trumpet shape, and the larger end of the expansion part is connected to the main pipe part.

[0023] Compared with the prior art, the application has the following beneficial effects: (1) The present application configures a desulfurizer reactor at the air inlet end of the common compressor, the desulfurizer reactor is configured with a desulfurizer filling device, the low-pressure sulfur-containing natural gas is subjected to desulfurization reaction in the desulfurizer reactor, and the natural gas after desulfurization reaches the standard is then introduced into the common compressor, so that the solution of using the common compressor to treat the sulfur-containing natural gas is realized, and a special sulfur-containing compressor is no longer needed, thereby greatly saving the exploitation cost of the sulfur-containing natural gas.

[0024] (2) According to the initial hydrogen sulfide concentration , gas flow and desulfurization reaction kinetics model, the initial filling parameters of the desulfurizer, namely, desulfurizer instantaneous flow , spray concentration and atomization particle size, are calculated, the coupling effects of the spray concentration and atomization particle size are considered, the flow-concentration-particle size cooperative control is established, the chemical reaction efficiency is dynamically associated with the fluid mechanics characteristics and solution physical properties, the control precision is improved, and the desulfurization effect is ensured.

[0025] (3) Based on the intermediate monitoring and outlet end monitoring of the desulfurizer reactor, the adjustment amount of the desulfurizer instantaneous flow, the spray concentration and the atomization particle size is calculated, and the filling parameters of the desulfurizer spray device are dynamically adjusted according to the adjustment amount, so that the influence of insufficient desulfurization reaction on the desulfurization effect is effectively avoided, and the final desulfurization treatment reaches the standard. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic view of the desulfurizer reactor in the present application.

[0027] Figure 2 It is a principle block diagram of embodiment 2 of the present application.

[0028] Wherein, the names corresponding to the reference signs are as follows: 1-main pipe part, 2-air inlet end part, 3-air outlet end part, 4-desulfurizer filling part, 5-multi-hole blind plate, 6-electrochemical sensor, 7-common compressor, 8-industrial control cabinet, 9-backstage server, 10-desulfurizer reactor, 11-desulfurizer spray device, 12-wellhead low-pressure gas conveying pipeline, 13-PH value sensor, 14-temperature sensor, 15-gas flowmeter; 21-straight pipe part, 22-expansion part. DETAILED DESCRIPTION

[0029] In order to make the person skilled in the art have a clearer understanding and knowledge of the present application, the present application is further described in detail below in conjunction with the embodiments. It should be known that the specific embodiments described below are only for explaining the present application, facilitating understanding, and the technical solutions provided by the present application are not limited to the technical solutions provided by the following embodiments, and the technical solutions provided by the embodiments should not limit the protection scope of the present application.

[0030] Embodiment 1 The present embodiment provides a method for exploiting a sulfur-containing natural gas field by using a common compressor. In the present embodiment, the common compressor refers to a non-sulfur-containing compressor, which is an air compressor, such as a conventional model air compressor of Sajin BD series, Hitachi BD-75A, etc.

[0031] The specific steps of the method for exploiting a sulfur-containing natural gas field by using a common compressor provided by the present embodiment are as follows: I. The low-pressure sulfur-containing natural gas is delivered to the desulfurizer reactor through the wellhead low-pressure gas delivery pipeline.

[0032] The conventional natural gas delivery is directly delivered to the compressor. This mode needs to use a sulfur-containing compressor, which has the disadvantage of high cost. Therefore, in the present step, the sulfur-containing natural gas is first introduced into the desulfurizer reactor for desulfurization treatment, and then the desulfurized natural gas is introduced into the common compressor, so that the purpose of using a common compressor to treat the sulfur-containing natural gas is achieved.

[0033] In a further preferred embodiment, the present step further comprises a pretreatment step, i.e. the low-pressure sulfur-containing natural gas is subjected to gas-liquid separation and / or temperature adjustment, for example: the low-pressure sulfur-containing natural gas is first introduced into a pretreatment unit, the pretreatment unit comprises a gas-liquid separator for removing liquid water and solid particles, and a temperature regulator for stabilizing the gas temperature at 10-50℃, and the output end of the pretreatment unit is connected to the input end (i.e. the gas inlet end) of the desulfurizer reactor.

[0034] II. Initial detection Real-time detection of the initial hydrogen sulfide concentration of the sulfur-containing natural gas at the gas inlet end of the desulfurizer reactor And the gas flow rate The hydrogen sulfide concentration is detected by an electrochemical sensor, and the gas flow rate is detected by a thermal mass flow meter (model ALICAT 20S), and the initial hydrogen sulfide concentration And the gas flow rate are taken as the input values of the initial filling parameters of the desulfurizer.

[0035] III. Calculation of the initial filling parameters of the desulfurizer, and control of the desulfurizer spray device to fill the desulfurizer into the desulfurizer reactor according to the calculation results According to the initial hydrogen sulfide concentration , gas flow , the initial filling parameters of the desulfurizer are calculated through a desulfurization reaction kinetics model, and the desulfurizer is filled into the desulfurizer reactor according to the calculation results; wherein the initial filling parameters include: desulfurizer instantaneous flow , spray concentration and atomization particle size; the calculation process of this step is completed in the background server, and the control command is issued to the industrial control cabinet, which controls the desulfurizer spray device to execute, and the control of the desulfurizer spray device includes: adjusting the dilution water flow to control the concentration of the desulfurizer, adjusting the atomization particle size by atomization gas pressure, etc.

[0036] In this step, the desulfurization reaction kinetics model is expressed as follows (in an embodiment, the equivalent prediction model based on LSTM neural network realizes the desulfurization reaction kinetics model, and the model is embedded in the background server):

[0037] In the formula, , indicates the hydrogen sulfide desulfurization reaction rate, , indicates the pre-exponential factor (characterizes the collision frequency of reactant molecules under ideal conditions, determines the benchmark value of reaction rate, the unit is consistent with the reaction rate, and the acquisition method is: measured by laboratory constant temperature reaction experiment (obtained by Arrhenius fitting at multiple temperature points), for example: measure the reaction rate at different temperatures, and obtain the intercept of Arrhenius graph), , indicates the activation energy of the reaction (characterizes the minimum energy threshold required for the reaction to occur, unit: kJ / mol, acquisition method: synchronous measurement with (Obtained by Arrhenius fitting at multiple temperature points), for example: calculate the slope of the Arrhenius graph), R represents the universal gas constant (8.314 J·mol -1 ·K -1 (known constant)), T represents the real-time temperature in the desulfurizer reactor, , m represents the hydrogen sulfide reaction order (value range 0.5-1.2 (dimensionless), characterizes the influence degree of hydrogen sulfide concentration on reaction rate, acquisition method: laboratory variable concentration experiment (mature experiment known), fix other conditions, change concentration: , fit the relationship: ), P represents the PH value correction, , (correct the influence of the deviation of the reaction environment pH value in the desulfurization reactor from the optimal value, acquisition method: pH disturbance experiment calibration, measure the reaction rate by changing the pH value in the laboratory: , Sensitivity coefficient (dimensionless), optimized by perturbation experiment, measured reaction rate by changing pH value in laboratory, quadratic function fitting, Real-time value of PH of gas in desulfurization reactor, Optimal reaction pH value (isoelectric point determination of desulfurizer (usually 7.8-8.5)).

[0038] Through the above settings, the pre-exponential factor, hydrogen sulfide reaction order and PH correction are introduced into the desulfurization reaction kinetics model, which ensures the calculation accuracy of the reaction rate and improves the utilization rate of the desulfurizer.

[0039] In this step, the instantaneous flow rate of the desulfurizer , the spray concentration and the calculation method of the atomized particle size are as follows: The instantaneous flow rate of the desulfurizer :

[0040] In the formula, indicates the hydrogen sulfide desulfurization reaction rate, indicates the volume of the desulfurization reactor, indicates the basic concentration of the desulfurizer; The spray concentration :

[0041] In the formula, indicates the upper limit of the safe concentration of the desulfurizer (indicated as follows: when the inlet hydrogen sulfide concentration is high and the temperature is low (i.e. when the hydrogen sulfide concentration is higher than the set threshold value and the temperature in the desulfurization reactor is lower than the set threshold value), the highest allowable concentration (set value) is used, and under normal working conditions, the concentration is dynamically optimized according to the cubic root relationship between the reaction rate and the gas flow), indicates the concentration adjustment coefficient (a preset value greater than 0, reference: 0.1% / ppm, which can be obtained by training historical data), indicates the hydrogen sulfide desulfurization reaction rate, indicates the gas flow; through the above settings, the adaptability of the spray concentration to the operating conditions is ensured; Atomized particle size d:

[0042] In the formula, indicates the maximum allowable particle size of the desulfurizer spray device (usually 150 μm, a known parameter of the desulfurizer spray device (i.e. atomizer), or set according to 10% of the minimum aperture of the desulfurization reactor flow channel), Indicates the characteristic constant of the atomizer (a preset value greater than 0, reference: 0.8μm / ppm, determined by the nozzle structure, which can be a known parameter of the desulfurizer spray device (i.e. ultrasonic atomizer), or calibrated through atomization experiments at a reference concentration of desulfurizer). represents the temperature correction coefficient (obtained through viscosity-temperature experimental fitting, determined by the viscosity ratio of the desulfurizer at 293K and 313K), T represents the real-time temperature in the desulfurizer reactor, Indicates the reference base temperature (the viscosity calibration temperature of the desulfurizer, based on the known value of the desulfurizer, such as 293K).

[0043] Through the above settings, the atomization particle size is inversely proportional to the spray concentration and is dynamically corrected through the temperature term. At high concentrations, the droplets are finer, improving the desulfurization efficiency. At the same time, the maximum allowable particle size is used for constraints to prevent the droplets from being too fine. In addition, high-temperature conditions automatically compensate for viscosity changes, thereby avoiding local desulfurization failure caused by uneven atomization.

[0044] 4. Obtaining Intermediate Detection Concentrations and feedback detection concentration .

[0045] At least one intermediate monitoring point is set on the desulfurizer reactor to detect the hydrogen sulfide concentration of the sour natural gas and obtain the intermediate detection concentration. , detect the hydrogen sulfide concentration of the sour natural gas at the outlet of the desulfurizer reactor, and obtain the feedback detection concentration .

[0046] The intermediate monitoring points are set at 30%-60% of the length of the desulfurizer reactor (middle section). By setting the intermediate monitoring points and the gas outlet monitoring points according to the desulfurizer reactor, insufficient desulfurization reaction in the desulfurizer reactor can be predicted in advance.

[0047] 5. Dynamically adjust the injection parameters of the desulfurizer spray device into the desulfurizer reactor.

[0048] The specific implementation of this step is as follows: Step S5.1: Based on the intermediate detection concentration and preset thresholds Deviation , and feedback detection concentration and target concentration Deviation , calculate the adjustment amount of desulfurizer filling parameters: Desulfurizer instantaneous flow rate Adjustment amount :

[0049] Where, a flow adjustment gain coefficient (reference value 0.5 L / h / ppm, which can be calibrated in the laboratory), a maximum allowable flow variation value (set value); spray concentration adjustment amount : ·

[0050] adjustment amount of atomized particle size d :

[0051] Step S5.2: Obtain the adjusted injection parameters according to the adjustment amount obtained in step S5.1 and the initial injection parameters (i.e., the sum of the two), and adjust the desulfurizer injection parameters of the desulfurizer spray device into the desulfurizer reactor according to the adjusted injection parameters.

[0052] Through the above settings, based on the intermediate monitoring and outlet end monitoring of the desulfurizer reactor, the adjustment amount of the instantaneous flow, spray concentration and atomized particle size of the desulfurizer is calculated, and the injection parameters of the desulfurizer spray device are dynamically adjusted according to the adjustment amount, effectively avoiding the influence of insufficient desulfurization reaction on the desulfurization effect, and ensuring that the final desulfurization treatment meets the standard.

[0053] Six, the desulfurized natural gas is transported through the outlet end of the desulfurizer reactor to the ordinary compressor.

[0054] Through the method provided in this embodiment, the natural gas containing sulfur is first introduced into the desulfurizer reactor for desulfurization treatment. In the process of desulfurization treatment, the injection parameters (non-single injection amount) of the desulfurizer are dynamically adjusted in real time in combination with the detection of hydrogen sulfide concentration, pH value and temperature, to ensure the desulfurization effect. Finally, the desulfurized natural gas is introduced into the ordinary compressor, thereby achieving the purpose of treating natural gas containing sulfur by using an ordinary compressor.

[0055] Example 2 As Figure 1 and Figure 2As shown, the embodiment provides a system for implementing the method provided in embodiment 1, i.e. a system for exploiting a sulfur-containing natural gas field using a common compressor, which comprises a common compressor 7, an industrial control cabinet 8, and a background server 9 in communication with the industrial control cabinet 8, a desulfurizer reactor 10 connected to the gas inlet end of the common compressor 7, a wellhead low-pressure gas conveying pipeline 12 connected to the gas inlet end of the desulfurizer reactor 10, an electrochemical sensor 6, a pH sensor 13, and a temperature sensor 14 arranged on the desulfurizer reactor 10, and a desulfurizer spraying device 11 connected to the desulfurizer reactor 10 and controlled by the industrial control cabinet 8, wherein the common compressor 7 is an air compressor that is not a sulfur-containing compressor, and the control of the desulfurizer spraying device includes adjusting the concentration of the desulfurizer by adjusting the flow of dilution water, adjusting the atomization particle size by adjusting the atomization gas pressure / ultrasonic frequency, etc., and the equipment can use existing mature equipment, such as an ultrasonic intelligent atomization device.

[0056] The industrial control cabinet is used to obtain the data collected by the sensors and transmit the data to the background server, at the same time, the industrial control cabinet receives the control commands of the background server and controls the desulfurizer spraying device to execute according to the control commands; the operation of the common compressor is also controlled by the industrial control cabinet; the conveying of the natural gas can use a corrosion-resistant horizontal centrifugal pump, which belongs to existing mature technical means, so it is not described here.

[0057] The background server 9 is used to execute part of the steps in the method provided in embodiment 1, and is configured with: a data acquisition module for acquiring the initial hydrogen sulfide concentration of the sulfur-containing natural gas , the gas flow , the intermediate detection concentration , and the feedback detection concentration ; an initial filling parameter calculation module: according to the initial hydrogen sulfide concentration , the gas flow , the desulfurizer initial filling parameters are calculated through a desulfurization reaction kinetics model, wherein the initial filling parameters include: desulfurizer instantaneous flow , spraying concentration , and atomization particle size; a filling parameter dynamic adjustment module: according to the feedback detection concentration and the intermediate detection concentration , the filling parameters of the desulfurizer spraying device filling the desulfurizer into the desulfurizer reactor are dynamically adjusted; a command module: generating a control command of the desulfurizer spraying device according to the initial filling parameters, generating a control command of the desulfurizer spraying device according to the adjusted filling parameters, and transmitting the control command to the industrial control cabinet.

[0058] It should be noted that the above modules are embedded in the background server in the form of programs, and the implementation is consistent with the step logic and effect in the method provided in Embodiment 1, and therefore will not be described here.

[0059] In this embodiment, the desulfurizer reactor includes a main pipe part 1, and a gas inlet end part 2 and a gas outlet end part 3 symmetrically arranged at two ends of the main pipe part 1, and the main pipe part 1, the gas inlet end part 2 and the gas outlet end part 3 all have inner cavities and are in an integrated structure; a desulfurizer filling part 4 is arranged on the main pipe part 1, the desulfurizer filling part 4 is used to connect an atomizing nozzle part of a desulfurizer spraying device, a plurality of perforated blind plates 5 are arranged in the inner cavities of the main pipe part 1, the electrochemical sensor 6, the PH value sensor 13 and the temperature sensor 14 for detecting the concentration of hydrogen sulfide are arranged on the main pipe part 1, the gas inlet end part 2 and the gas outlet end part 3, the temperature sensor 14 is preferably a corrosion-resistant temperature sensor, for example, a PT100 type armored temperature sensor; the gas inlet end part 2 and the gas outlet end part 3 both include a straight pipe part 21 and an expansion part 22 in an integrated structure, the expansion part 22 is in a trumpet shape, and the larger end thereof is connected with the main pipe part 1, and the smaller end is connected with one end of the straight pipe part, and the other end of the straight pipe part can be provided with a connecting flange for connecting external components.

[0060] Preferably, the sampling frequency of the sensor is ≥1 Hz, wherein the electrochemical sensor arranged on the main pipe part 1 is arranged at a position in the interval of 30%-60% of the total length of the main pipe part of the desulfurizer reactor; at the same time, a gas flow meter, for example, a corrosion-resistant thermal mass flow meter, is arranged on the gas inlet end part 2 for collecting the initial gas flow of the natural gas.

[0061] The size example specifications of the desulfurizer reactor are as follows: total length 1.8M, wall thickness (10mm), material (carbon steel A105), perforated blind plate round hole size (6*∅10)*10 pieces, desulfurizer filling part 3 / 8 internal thread matching spray device, length 20CM. According to different natural gas exploitation conditions, those skilled in the art can also use desulfurizer reactors of other size specifications.

[0062] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A method for exploiting a sour natural gas field using a conventional compressor, characterized in that: The following steps are involved: Step S1: transporting low-pressure sulfur-containing natural gas to a desulfurizer reactor through a wellhead low-pressure gas pipeline; Step S2: Real-time detection of the initial hydrogen sulfide concentration of the sour natural gas at the gas inlet end of the desulfurizer reactor and gas flow ; Step S3: According to the initial hydrogen sulfide concentration , gas flow , calculate the initial filling parameters of the desulfurizer through the desulfurization reaction kinetic model, and control the desulfurizer spray device to add desulfurizer into the desulfurizer reactor according to the calculation results; wherein, the initial filling parameters include: desulfurizer instantaneous flow rate , spray concentration and atomization particle size; Step S4: Set at least one intermediate monitoring point on the desulfurizer reactor to detect the hydrogen sulfide concentration of the sulfur-containing natural gas and obtain the intermediate detection concentration , detect the hydrogen sulfide concentration of the sour natural gas at the outlet of the desulfurizer reactor, and obtain the feedback detection concentration ; Step S5: Detecting concentration based on the feedback and intermediate detection concentrations Dynamically adjust the injection parameters of the desulfurizer spray device into the desulfurizer reactor, and control the desulfurizer spray device to inject the desulfurizer into the desulfurizer reactor; Step S6: The natural gas that meets the desulfurization standards is transported to a common compressor through the gas outlet of the desulfurizer reactor.

2. The method for exploiting a sour natural gas field using a conventional compressor according to claim 1, characterized in that: Before step S1, a pre-processing step is also included: The low-pressure sour natural gas is subjected to gas-liquid separation and / or temperature adjustment.

3. The method for exploiting a sour natural gas field using a conventional compressor according to claim 2, characterized in that: The desulfurization reaction kinetic model in step S3 is expressed as follows: , where represents the hydrogen sulfide desulfurization reaction rate, represents the pre-exponential factor, represents the reaction activation energy, R represents the universal gas constant, T represents the real-time temperature in the desulfurizer reactor, represents the initial hydrogen sulfide concentration, m represents the hydrogen sulfide reaction order, and P represents the pH value correction. .

4. The method for exploiting a sour natural gas field using a conventional compressor according to claim 3, characterized in that: The instantaneous flow rate of the desulfurizing agent in step S3 , spray concentration The calculation methods of atomization particle size are as follows: The instantaneous flow rate of the desulfurizer : , where represents the hydrogen sulfide desulfurization reaction rate, Indicates the volume of the desulfurization reactor, Indicates the basic concentration of desulfurizer; The spray concentration : , where Indicates the upper limit of desulfurizer safety concentration (expressed as follows: when the inlet hydrogen sulfide concentration is high and the temperature is low, represents the concentration adjustment coefficient, represents the hydrogen sulfide desulfurization reaction rate, Indicates gas flow rate; The atomized particle size d: , where Indicates the maximum allowable particle size of the desulfurizer spray device, represents the characteristic constant of the atomizer, represents the temperature correction coefficient, T represents the real-time temperature in the desulfurizer reactor, Indicates the reference base temperature.

5. The method for exploiting a sour natural gas field using a conventional compressor according to claim 4, characterized in that: In step S4, the intermediate monitoring point is set in the range of 30%-60% of the length of the main pipe section of the desulfurizer reactor.

6. The method for exploiting a sour natural gas field using a conventional compressor according to claim 5, characterized in that: The step S5 comprises: Step S5.1: According to the intermediate detection concentration and preset thresholds Deviation , and feedback detection concentration and target concentration Deviation , calculate the adjustment amount of desulfurizer filling parameters: Desulfurizer instantaneous flow rate Adjustment amount : , where is the flow adjustment gain coefficient, is the maximum allowable flow rate change value; Spray concentration Adjustment amount : · , the adjustment amount of atomization particle size d : Step S5.2: According to the adjustment amount obtained in step S5.1 and the initial filling parameters, an adjusted filling parameter is obtained, and the desulfurizer spray device is adjusted according to the adjusted filling parameter to add desulfurizer into the desulfurizer reactor.

7. A system for exploiting a sour natural gas field using a conventional compressor, characterized in that: The invention comprises a common compressor (7), an industrial control cabinet (8) and a background server (9) communicating with the industrial control cabinet (8); a desulfurizer reactor (10) is connected to the air inlet end of the common compressor (7); the air inlet end of the desulfurizer reactor (10) is connected to a wellhead low-pressure gas transmission pipeline (12); an electrochemical sensor (6), a pH sensor (13) and a temperature sensor (14) are provided on the desulfurizer reactor (10); and the desulfurizer reactor (10) is connected to a desulfurizer spray device (11) controlled by the industrial control cabinet (8).

8. The system for exploiting sour natural gas fields using a conventional compressor according to claim 7, characterized in that: The backend server (9) is configured with: Data acquisition module, used to obtain the initial hydrogen sulfide concentration of sour natural gas , gas flow , intermediate detection concentration and feedback detection concentration ; Initial filling parameter calculation module: according to the initial hydrogen sulfide concentration , gas flow , the initial filling parameters of the desulfurizer are calculated by the desulfurization reaction kinetic model, wherein the initial filling parameters include: the instantaneous flow rate of the desulfurizer , spray concentration and atomization particle size; Filling parameter dynamic adjustment module: detect concentration according to the feedback and intermediate detection concentrations Dynamically adjust the injection parameters of the desulfurizer spray device into the desulfurizer reactor; Command module: generates a control command for the desulfurizer spray device according to the initial filling parameters, generates a control command for the desulfurizer spray device according to the adjusted filling parameters, and transmits the command to the industrial control cabinet.

9. The system for exploiting sour natural gas fields using a conventional compressor according to claim 8, characterized in that: The desulfurizer reactor comprises a main pipe section (1), and an air inlet end section (2) and an air outlet end section (3) symmetrically arranged at both ends of the main pipe section (1); the main pipe section (1), the air inlet end section (2) and the air outlet end section (3) all have inner cavities and are an integrated structure; a desulfurizer filling section (4) is provided on the main pipe section (1), and a plurality of porous blind plates (5) arranged at intervals are provided in the inner cavity of the main pipe section (1).

10. The system for exploiting sour natural gas fields using a conventional compressor according to claim 9, characterized in that: The air inlet end (2) and the air outlet end (3) both comprise an integrated straight pipe portion (21) and an expansion portion (22); the expansion portion (22) is trumpet-shaped, and its larger end is connected to the main pipe portion (1).

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