WO2023087506A1 - Combustible gas recycling processing apparatus and combustible gas recycling processing method - Google Patents

Abstract

A combustible gas recycling processing apparatus and a combustible gas recycling processing method. The combustible gas recycling processing apparatus comprises a combustible gas collecting device (100) configured to collect and deliver gas at a predetermined flow rate; a gas compressing device (200) configured to compress the gas to a predetermined pressure and discharge the compressed gas; a gas-liquid separating device (300) comprising a condenser and a gas-liquid separator; a membrane separator (400) connected to a gas outlet of the gas-liquid separator and configured to enrich the combustible gas, discharge the enriched combustible gas from a first outlet, and discharge the remaining gas from a second outlet, the gas discharged from the first outlet being re-delivered to the gas compressing device (200) for recycling processing; a first concentration analyzer (500) arranged at the first outlet of the membrane separator (400) to measure a first concentration; and a controller (600) configured to adjust at least one of the predetermined flow rate, the predetermined pressure, and a condensing temperature of the condenser according to the first concentration. Further disclosed is a combustible gas recycling processing method using the combustible gas recycling processing apparatus.

Description

Combustible gas circulation treatment equipment and combustible gas circulation treatment method

For all purposes, this application claims the priority of Chinese Patent Application No. 202111362429.1 filed on November 17, 2021, and the content disclosed in the above Chinese patent application is hereby cited in its entirety as a part of this application.

technical field

Embodiments of the present disclosure relate to a combustible gas circulation treatment device and a combustible gas circulation treatment method.

Background technique

When the volume fraction of combustible gas such as hydrocarbons mixed with air reaches the limit of explosion, it will explode when encountering static electricity or open flame. If these mixed gases are not properly disposed of, they will cause great danger to the surrounding environment.

At present, in the field of combustible gas separation, atmospheric pressure low-temperature liquefaction condensation or low-pressure membrane separation technology is generally used to separate it. For combustible gas leakage or volatilization, it is an organized discharge working condition, with fixed emission sources, fixed equipment, fixed process parameters, and gas treatment. Single type.

Contents of the invention

According to at least one embodiment of the present disclosure, there is provided a combustible gas circulation treatment device, including: a combustible gas collection device configured to collect and deliver gas at a predetermined flow rate; a gas compression device connected to an outlet of the combustible gas collection device, And configured to compress the gas to a predetermined pressure and discharge; the gas-liquid separation device includes a condenser and a gas-liquid separator, the inlet of the condenser is connected to the outlet of the gas compression device, and the outlet of the condenser is connected to The gas-liquid separator, the gas-liquid separator is configured to separate gas and liquid in the condensed gas, and includes a gas outlet for discharging gas and a liquid outlet for discharging liquid, a membrane separator, and the gas separator The gas outlet is connected, including a first outlet and a second outlet, and is configured to enrich the combustible gas and discharge it from the first outlet and discharge the remaining gas from the second outlet, and the first outlet is connected to the second outlet. The gas compression device is connected to retransmit the gas discharged from the first outlet to the gas compression device for circulation treatment; the first concentration analyzer is arranged at the first outlet of the membrane separator and is configured as performing combustible gas concentration measurement on the gas discharged from the first outlet of the membrane separator to obtain a first concentration value; a controller configured to adjust the predetermined flow rate, the predetermined pressure and the predetermined concentration value according to the first concentration value at least one of the condensation temperatures of the condenser.

In some examples, adjusting at least one of the predetermined flow rate, the predetermined pressure, and the condensation temperature of the condenser according to the first concentration value includes: comparing the first concentration value with the combustible gas collection Combustible gas concentration value at the inlet of the device, when the first concentration value is greater than the combustible gas concentration value at the inlet of the combustible gas collection device and the difference between the two is less than 10% of the first concentration value , increasing the predetermined pressure and/or decreasing the condensation temperature.

In some examples, the gas-liquid separation device includes a liquid storage tank connected to the liquid outlet of the gas-liquid separator, the volume of the liquid storage tank is Vml, and the predetermined flow rate is adjusted according to the first concentration value , at least one of the predetermined pressure and the condensation temperature of the condenser includes: comparing the first concentration value with the combustible gas concentration value at the inlet of the combustible gas collection device, where the first concentration value When the combustible gas concentration value at the inlet of the combustible gas collection device is greater than the liquid discharge rate of the liquid outlet of the gas-liquid separator is greater than zero and less than Vml/60min, the predetermined pressure is increased and/or decreased the condensation temperature.

In some examples, the gas-liquid separation device includes a liquid storage tank connected to the liquid outlet of the gas-liquid separator, the volume of the liquid storage tank is Vml, and the predetermined flow rate is adjusted according to the first concentration value , at least one of the predetermined pressure and the condensation temperature of the condenser includes: comparing the first concentration value with the combustible gas concentration value at the inlet of the combustible gas collection device, and if the first concentration value is less than the set When the combustible gas concentration value at the inlet of the combustible gas collecting device is greater than or equal to Vml/60min, and the liquid discharge rate of the liquid outlet of the gas-liquid separator is greater than or equal to Vml/60min, the predetermined flow rate is increased.

In some examples, the condenser includes multi-stage refrigeration units with different condensation temperatures, and the controller is configured to turn on one or more stages of refrigeration units of the condenser according to the type of combustible gas collected.

In some examples, the combustible gas circulation treatment equipment further includes: an exhaust gas treatment device, including an adsorption box, the inlet of the adsorption box is connected with the second outlet of the membrane separator, so as to adsorb the combustible gas entering the adsorption box , and the unadsorbed gas is discharged through the outlet of the adsorption box, the second concentration analyzer is arranged at the second outlet of the membrane separator, and is configured to discharge the second outlet of the membrane separator Combustible gas concentration measurement is performed on the gas to obtain a second concentration value; the third concentration analyzer is arranged at the outlet of the adsorption box, and is configured to measure the combustible gas concentration of the gas discharged from the outlet of the adsorption box to obtain a second concentration value. obtain a third concentration value, wherein the controller is further configured to adjust the predetermined flow rate, the predetermined pressure and the At least one of the condensation temperatures of the condenser.

In some examples, the gas compression device includes a buffer tank, a compressor and a pressure reducing valve, the outlet of the gas collection device is connected to the first inlet of the buffer tank, and the outlet of the buffer tank is connected to the first inlet of the compressor. The inlet of the compressor is connected, the outlet of the compressor is connected with the second inlet of the buffer tank through the pressure reducing valve, and the pressure reducing valve is configured to open when the pressure is greater than or equal to a threshold value to conduct From the outlet of the compressor to the second inlet of the buffer tank, the controller is further configured to adjust the pressure threshold according to the predetermined pressure so that the pressure threshold is higher than the Book pressure.

According to at least one embodiment of the present disclosure, a combustible gas circulation treatment method is provided, including: combustible gas collecting step: collecting gas containing combustible gas, and delivering it at a predetermined flow rate; gas compression step: collecting the combustible gas The collected gas is compressed to a predetermined pressure; gas-liquid separation step: the compressed gas is introduced into the condenser for condensation, and the condensed gas is subjected to gas-liquid separation; membrane separation step: the gas-liquid separation is separated by a membrane separator membrane separation of the gas to form a first part of the gas and a second part of the gas, the combustible gas concentration of the first part is greater than the combustible gas concentration of the second part, and the first part of the gas is reintroduced into the combustible gas to compress The steps are to perform circulation processing; measure the combustible gas concentration of the first part of the gas to obtain a first concentration value; and adjust the predetermined flow rate, the predetermined pressure and the condensation of the condenser according to the first concentration value at least one of the temperatures.

In some examples, adjusting at least one of the predetermined flow rate, the predetermined pressure, and the condensation temperature of the condenser according to the first concentration value includes: comparing the first concentration value with the flammability of the collected gas. Gas concentration value, when the first concentration value is greater than the combustible gas concentration value of the collected gas and the difference between the two is less than 10% of the first concentration value, increase the predetermined pressure and/or Lower the condensation temperature of the condenser.

In some examples, the liquid separated in the gas-liquid separation step is introduced into a liquid storage tank with a volume of Vml, and the predetermined flow rate, the predetermined pressure and the condensation of the condenser are adjusted according to the first concentration value. At least one of the temperature includes: comparing the first concentration value with the combustible gas concentration value of the collected gas, when the first concentration value is greater than the combustible gas concentration value of the collected gas and the gas-liquid separated liquid is discharged When the speed is greater than zero and less than Vml/60min, increase the predetermined pressure and/or decrease the condensation temperature of the condenser.

In some examples, the liquid separated in the gas-liquid separation step is introduced into a liquid storage tank with a volume of Vml, and the predetermined flow rate, the predetermined pressure and the condensation of the condenser are adjusted according to the first concentration value. At least one of the temperature includes: comparing the first concentration value with the combustible gas concentration value of the collected gas, when the first concentration value is smaller than the combustible gas concentration value of the collected gas and the gas-liquid separated liquid is discharged When the speed is greater than or equal to Vml/60min, increase the predetermined flow rate.

In some examples, the condenser includes multi-stage refrigeration units with different condensation temperatures, and the method further includes turning on one or more stages of refrigeration units of the condenser according to the type of combustible gas in the collected gas.

In some examples, the combustible gas circulation treatment method further includes: adsorbing the combustible gas in the second part of the gas through an adsorption box, and discharging the unadsorbed gas through the outlet of the adsorption box, and treating the second part Combustible gas concentration measurement is performed on the gas to obtain a second concentration value; the combustible gas concentration measurement is performed on the gas discharged from the outlet of the adsorption box to obtain a third concentration value, according to the first concentration value, the second concentration value and adjusting at least one of the predetermined flow rate, the predetermined pressure, and the condensation temperature of the condenser with the third concentration value.

In some examples, the gas compressing step includes: introducing the collected gas into a buffer tank, introducing the gas from the buffer tank into a compressor for compression, and connecting the outlet of the compressor to the buffer tank. a pressure relief valve configured to open when a pressure threshold is greater than or equal to conduct a passage from the outlet of the compressor to the second inlet of the buffer tank, the combustible The gas circulation processing method further includes: adjusting the pressure threshold according to the predetermined pressure, so that the pressure threshold is higher than the predetermined pressure.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present invention, rather than limiting the present invention .

FIG. 1 is a schematic block diagram of a combustible gas circulation processing device according to some embodiments of the present disclosure;

Fig. 2 is a schematic block diagram of combustible gas circulation processing equipment according to other embodiments of the present disclosure;

FIG. 3 is a flowchart of a combustible gas circulation treatment method according to some embodiments of the present disclosure.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative effort fall within the protection scope of the present invention.

Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the usual meanings understood by those skilled in the art to which the present disclosure belongs. "First", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

At present, in the field of combustible gas separation, atmospheric pressure low-temperature liquefaction condensation or low-pressure membrane separation technology is generally used to separate it. For combustible gas leakage or volatilization, it is an organized discharge working condition, with fixed emission sources, fixed equipment, fixed process parameters, and gas treatment. Single type. Existing technologies cannot cope with unorganized emission conditions where the emission source is not fixed, the concentration of the exhaust gas, and the type of gas are not fixed.

Aiming at the above technical problems, at least some embodiments of the present disclosure provide a combustible gas circulation treatment device, including: a combustible gas collection device configured to collect and transport gas at a predetermined flow rate; a gas compression device and the combustible gas The outlet of the collection device is connected and configured to compress the gas to a predetermined pressure and discharge it; the gas-liquid separation device includes a condenser and a gas-liquid separator, the inlet of the condenser is connected to the outlet of the gas compression device, and the The outlet of the condenser is connected to the gas-liquid separator configured to separate gas and liquid in the condensed gas, and includes a gas outlet for discharging gas and a liquid outlet for discharging liquid, a membrane separator, and The gas outlets of the gas separator are connected, include a first outlet and a second outlet, and are configured to enrich the combustible gas and discharge it from the first outlet and discharge the remaining gas from the second outlet, so The first outlet is connected to the gas compression device, so that the gas discharged from the first outlet is sent to the gas compression device again for circulation treatment; the first concentration analyzer is arranged at the first outlet of the membrane separator and configured to measure the combustible gas concentration of the gas discharged from the first outlet of the membrane separator to obtain a first concentration value; the controller is configured to adjust the predetermined flow rate according to the first concentration value , at least one of the predetermined pressure and the condensation temperature of the condenser. Other embodiments of the present disclosure provide a combustible gas circulation treatment method, including: a combustible gas collection step: collecting gas containing combustible gas, and delivering it at a predetermined flow; gas compression step: collecting the combustible gas The collected gas is compressed to a predetermined pressure; gas-liquid separation step: the compressed gas is introduced into the condenser for condensation, and the condensed gas is subjected to gas-liquid separation; membrane separation step: the gas-liquid separation is separated by a membrane separator membrane separation of the gas to form a first part of the gas and a second part of the gas, the combustible gas concentration of the first part is greater than the combustible gas concentration of the second part, and the first part of the gas re-enters the combustible gas compression The steps are to perform circulation processing; measure the combustible gas concentration of the first part of the gas to obtain a first concentration value; and adjust the predetermined flow rate, the predetermined pressure and the condensation of the condenser according to the first concentration value at least one of the temperatures. The combustible gas circulation treatment device and combustible gas circulation treatment method according to the embodiments of the present disclosure can deal with fugitive emissions, can adjust process parameters according to actual working conditions, and effectively deal with various combustible gases such as various hydrocarbons, with circulation and data Match the characteristics of the analysis, and can manually/intelligently adjust the process parameters.

In the following, the combustible gas circulation treatment device and the combustible gas circulation treatment method according to some embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1 , the combustible gas circulation processing equipment according to at least one embodiment of the present disclosure includes: a combustible gas collection device 100, a gas compression device 200, a gas-liquid separation device 300, a membrane separator 400, a first concentration analyzer 500 and Controller 600. The combustible gas collection device is used to collect and deliver gas at a predetermined flow rate, and the outlet of the combustible gas collection device 100 is connected to a gas compression device 200 . The gas compression device 200 is used to compress the gas to a predetermined pressure and discharge it. The gas discharged from the gas compression device 200 is introduced into the gas-liquid separation device 300 . For example, the gas-liquid separation device 300 includes a condenser and a gas-liquid separator (please refer to FIG. 2 ). The inlet of the condenser is connected to the outlet of the gas compression device 300, and the outlet of the condenser is connected to the gas-liquid separator, so that the gas introduced from the condenser is separated into gas and liquid in the gas-liquid separator. For example, the gas introduced from the condenser contains small liquid droplets that have condensed into liquid. The gas-liquid separator includes a gas outlet and a liquid outlet, so that the separated gas and liquid are discharged from the gas outlet and the liquid outlet respectively. The gas discharged from the gas-liquid separator 300, that is, the gas discharged from the gas outlet of the gas-liquid separator, is introduced into the membrane separator 400. For example, the membrane separator 400 is connected to the gas outlet of the gas separator. Membrane separator 400 includes a first outlet and a second outlet, and is configured to enrich the combustible gas and discharge it from the first outlet and discharge the remaining gas from the second outlet (for example, the membrane in FIG. 1 shown by the arrow on the right side of separator 400). That is to say, the gas enriched in combustible gas is discharged from the first outlet, and the remaining gas is discharged from the second outlet. The first outlet is connected to the gas compression device 100, so that the gas discharged from the first outlet is sent to the gas compression device 100 again for circulation treatment. The first concentration analyzer 500 is arranged at the first outlet of the membrane separator, and is configured to measure the combustible gas concentration of the gas discharged from the first outlet of the membrane separator 400 to obtain a first concentration value. The controller 600 is configured to adjust at least one of the predetermined flow rate, the predetermined pressure and the condensation temperature of the condenser according to the first concentration value.

The combustible gas collection device 100 is used for collecting gas, for example, a mixed gas containing combustible gas. After the combustible gas collection device 100 collects the gas, it is transported to subsequent processing equipment at a predetermined flow rate. For example, the combustible gas collection device 100 may include a collection port and a fan (not shown in the figure) connected to the collection port. In some embodiments, a high pressure fan may be used to increase collection efficiency. The fan is the source of gas suction and collection by the combustible gas collection device. By controlling the working state of the fan, the output gas flow rate of the combustible gas collection device can be controlled, that is, the rate of gas collection. For example, the fan can be controlled by a variable frequency motor, thereby effectively controlling the working state of the fan and further controlling the predetermined flow rate of the gas delivered by the combustible gas collection device. The present disclosure has no particular limitation on the range of the predetermined flow rate, which can be determined according to the processing capacity of the subsequent processing device, the degree of leakage of combustible gas on site, and the like.

The gas compression device 200 is used to compress the gas collected by the combustible gas collection device 100 to a predetermined pressure. The aforementioned predetermined pressure can be adjusted by adjusting the working state of the gas compression device 200 . For example, the gas compression device 200 may include a compressor whose compression pressure is adjustable. The predetermined pressure can affect the efficiency of the subsequent combustible gas treatment, and it can be properly adjusted according to the type of gas to be treated, the treatment efficiency of the subsequent treatment device, and the like. For example, the gas source of the gas compression device 200 may include two sources, one is the gas collected by the combustible gas collection device 100 , and the other is the gas enriched in combustible gas discharged from the first outlet of the membrane separator 400 . Therefore, at least part of the gas is recycled.

The gas-liquid separation device 300 separates gas from liquid through condensation and gas-liquid separation. For example, at least part of the combustible gas in the mixed gas can be liquefied. The liquid formed after the combustible gas is liquefied is discharged through the liquid outlet (for example, please refer to the arrow on the right side of the gas-liquid separation device 300 in FIG. 1 ). Other gases are discharged through the gas outlet of the gas-liquid separator (gas outlet of the gas-liquid separator) (for example, please refer to the arrow on the lower side of the gas-liquid separator 300 in FIG. 1 ). The liquid discharged from the gas-liquid separation device 300 is subsequently processed, for example, by gasification and combustion. The gases formed after combustion can be directly vented to the outside world (eg, into the atmosphere).

The membrane separator 400 further processes the gas separated by the gas-liquid separation device 300 . For example, the membrane separator includes a gas filter membrane, and the first outlet of the membrane separator and the second outlet of the membrane separator are respectively located on both sides of the filter membrane, for example, the first outlet is located on the side enriched with combustible gas. Since the molecular size of combustible gases such as hydrocarbon combustible gases is different from that of gases in the air, the mixture of combustible gases and air can be separated by selecting a gas filter membrane with a suitable pore size, and the combustible gas can be enriched on the side of the filter membrane. Gas, while there is no combustible gas or the concentration of combustible gas is reduced on the other side of the filter membrane. As for the selection of the filter membrane, any suitable gas filter membrane can be selected, and the embodiments of the present disclosure are not particularly limited, so details will not be repeated here. As shown in Figure 1, the gas enriched in combustible gas through the membrane separator 400 can be returned to the gas compression device 200 for recycling treatment, while the concentration of combustible gas in the other gases discharged from the second outlet of the membrane separator 400 is very small, Presents no fire or explosion hazard, but cannot be discharged directly into the atmosphere. After this part of gas is discharged from the second outlet, waste gas treatment can be performed.

The first concentration analyzer 500 is provided at the first outlet of the membrane separator 400 . As shown in FIG. 1 , placing the first concentration analyzer anywhere in the path between the membrane separator 400 and the gas compression device 200 is to measure the gas concentration discharged from the first outlet of the first membrane separator 400 . Therefore, both can be regarded as being arranged at the first outlet of the membrane separator 400 . The specific structure and type of the first concentration analyzer are not particularly limited, as long as it can measure the concentration of combustible gas in the gas, so it will not be repeated here.

The controller 600 is used to adjust the predetermined flow rate of the combustible gas collection device, the predetermined pressure of the gas compression device 200 and the gas-liquid separation according to the combustible gas concentration in the gas discharged from the first outlet of the membrane separator 400 measured by the first concentration analyzer 500 At least one of the condensation temperatures of the condenser in the device. Although it is shown in FIG. 1 that the controller 600 is only connected to the first concentration analyzer 500, embodiments according to the present disclosure are not limited thereto. For example, if the controller 600 is required to automatically control the aforementioned predetermined flow rate, predetermined pressure and condensation temperature, the controller 600 can also be connected to the combustible gas collection device 100 , the gas compression device 200 and the gas-liquid separation device 300 . For example, it can be connected to the fan of the combustible gas collection device 100, the compressor in the gas compression device 200, and the condenser in the gas-liquid separation device 300 to control the corresponding components to achieve the purpose of controlling the above parameters. In addition, it should be noted that, in addition to the automatic control by the above-mentioned controller, the operator may also manually control at least part of the parameters of the device according to the information fed back by the controller. The above-mentioned control methods can all include that the controller adjusts the predetermined flow rate of the combustible gas collection device and the predetermined flow rate of the gas compression device 200 according to the combustible gas concentration in the gas discharged from the first outlet of the membrane separator 400 measured by the first concentration analyzer 500 . In the range of at least one of the pressure and the condensation temperature of the condenser in the gas-liquid separation device.

It should be noted that the first concentration value is measured during gas treatment by the combustible gas treatment equipment. Since the combustible gas processing equipment according to the embodiments of the present disclosure can be continuously cycled, the operating parameters of various devices or parts in the combustible gas processing equipment can be adjusted by detecting the first concentration value in real time. For example, when the combustible gas processing equipment starts to operate, the equipment can be operated with preset parameters according to the type of combustible gas discharged unorganizedly on site, for example, hydrocarbon combustible gases such as propylene. For example, the predetermined flow rate of the above-mentioned combustible gas collection device, the predetermined pressure of the gas compression device 200 and the condensation temperature of the condenser in the gas-liquid separation device may adopt preset parameters during the first cycle treatment. Then, various parameters are adjusted in real time according to the first concentration value.

In some examples, the controller may compare the first concentration value with the combustible gas concentration value at the inlet of the combustible gas collection device, and when the first concentration value is greater than the combustible gas concentration value at the inlet of the combustible gas collection device The gas concentration value and the difference between the two are not large, for example, when the difference between the two is less than 10% of the first concentration value, the predetermined pressure of the gas compression device can be increased. By increasing the predetermined pressure, the degree of enrichment of the combustible gas can be increased.

In some examples, the controller may compare the first concentration value with the combustible gas concentration value at the inlet of the combustible gas collection device, and when the first concentration value is greater than the combustible gas concentration value at the inlet of the combustible gas collection device The gas concentration value and the difference between the two are not large, for example, when the difference between the two is less than 10% of the first concentration value, the condensation temperature of the condenser in the gas-liquid separation device can be reduced. By lowering the above-mentioned condensation temperature, the enrichment degree of the combustible gas concentration can be increased.

In some examples, the controller may compare the first concentration value with the combustible gas concentration value at the inlet of the combustible gas collection device, and when the first concentration value is greater than the combustible gas concentration value at the inlet of the combustible gas collection device The gas concentration value and the difference between the two are not large, for example, when the difference between the two is less than 10% of the first concentration value, the predetermined pressure of the gas compression device can be increased and the condenser in the gas-liquid separation device can be lowered at the same time. condensing temperature. By increasing the above-mentioned predetermined pressure and lowering the above-mentioned condensation temperature, the concentration enrichment degree of the combustible gas can be increased.

In some examples, the gas-liquid separation device includes a liquid storage tank (please refer to FIG. 2 ) connected to the liquid outlet of the gas-liquid separator, and the volume of the liquid storage tank is V milliliters (ml). The embodiment of the present disclosure has no particular limitation on the specific volume of the liquid storage tank, and a liquid storage tank with a suitable volume can be determined according to actual needs. The controller may compare the first concentration value with the combustible gas concentration value at the inlet of the combustible gas collection device, when the first concentration value is greater than the combustible gas concentration value at the inlet of the combustible gas collection device and the When the liquid discharge rate of the liquid outlet of the gas-liquid separator is greater than zero and less than Vml/60min, increase the predetermined pressure of the gas compression device or reduce the condensation temperature of the condenser in the gas-liquid separation device, or simultaneously increase the the predetermined pressure and lower the condensation temperature. The liquid discharge rate of Vml/60min indicates that at this rate, it takes 60 minutes (min) to fill the liquid storage tank. By adjusting the above parameters, the efficiency of condensation can be improved, the speed of liquid generation can be accelerated, and the processing capacity of combustible gas can be improved.

In some examples, the controller may compare the first concentration value with the combustible gas concentration value at the inlet of the combustible gas collection device, and when the first concentration value is smaller than the combustible gas concentration at the inlet of the combustible gas collection device value, and the liquid discharge rate of the liquid outlet of the gas-liquid separator is greater than or equal to Vml/60min, increase the predetermined flow rate. If the liquid discharge speed is fast, it means that most of the combustible gases such as hydrocarbons are quickly liquefied. At this time, the flow rate of the fan of the gas collection device can be increased to speed up the processing speed of the combustible gas on site and improve the processing efficiency.

For example, a condenser in a gas-liquid separation plant includes multiple stages of refrigeration units with different condensation temperatures. The controller is configured to turn on one or more refrigeration units of the condenser according to the type of combustible gas collected. For example, the condenser may include three stages of condensing units with different condensing temperatures. Since different combustible gases have different liquefaction temperatures, different types of combustible gases can be liquefied by setting different condensation temperatures. For example, the greater the number of carbon atoms in the combustible gas molecule, the higher the liquefaction temperature. Therefore, when it is detected that the type of hydrocarbon gas processed on site is C4 and more carbon atoms, one or more condensing units can be closed. It can also meet the needs of liquefaction.

Fig. 2 is a schematic block diagram of a combustible gas circulation processing device according to some other embodiments of the present disclosure. The embodiment in FIG. 2 refines or adds part of the processing devices or components on the basis of the combustible gas circulation processing equipment in FIG. Refine or add any part of the device or component shown in Figure 2. For brevity of description, the parts that have the same structure and function as those in FIG. 1 will not be described in detail below.

As shown in Figure 2, the gas compression device includes a buffer tank, a compressor and a pressure reducing valve. The outlet of the combustible gas collection device is connected to the first inlet of the buffer tank, the outlet of the buffer tank is connected to the inlet of the compressor, and the outlet of the compressor is connected to the second inlet of the buffer tank through a pressure reducing valve. The decompression valve is configured to open when the pressure is greater than or equal to a threshold value, so as to conduct the passage from the outlet of the compressor to the second inlet of the buffer tank, so that the pipeline and subsequent processing The device is protected. It should be noted that although the first inlet and the second inlet are shown in the figure, they are respectively used for the introduction of the gas collected by the combustible gas collection device and the introduction of the gas returned in the subsequent processing device, but according to the implementation of the present disclosure Examples are not limited to this. The first entrance and the second entrance can also be combined together. Therefore, the meaning of the first inlet and the second inlet here includes the first inlet and the second inlet arranged separately, and may also include the first inlet and the second inlet combined together. The first inlet and the second inlet are only used to illustrate the different paths of various parts of the fluid leading into the buffer tank, and are not intended to limit the separation or combination of the first inlet and the second inlet. As mentioned above, the controller can adjust the predetermined pressure of the gas compression device according to the first concentration value measured by the first concentration analyzer. However, the pressure threshold of the pressure reducing valve is also a parameter related to the predetermined pressure, for example, the pressure threshold is based on the predetermined pressure plus a certain margin. Accordingly, in some examples, the controller is further configured to adjust the pressure threshold based on the predetermined pressure such that the pressure threshold is higher than the predetermined pressure.

For example, a pressure gauge may be provided at the outlet of the compressor, and the pressure gauge is used to detect the pressure of the gas discharged from the outlet of the compressor. For example, the gas pressure detected here corresponds to the predetermined pressure of the above-mentioned gas compression device or compressor.

As described above, the gas discharged at the second outlet of the membrane separator is subjected to waste gas treatment. As shown in Fig. 2, the exhaust gas treatment device may include an adsorption box. The inlet of the adsorption box is connected with the second outlet of the membrane separator to absorb the combustible gas entering the adsorption box, and discharge the unadsorbed gas through the outlet of the adsorption box. In addition, the exhaust gas treatment device may also include a vacuum pump, which is used to extract the combustible gas adsorbed in the adsorption box and reintroduce it into the buffer tank for circulation treatment. The exhaust gas treatment device may also include a blower, which is used to introduce the gas not absorbed by the adsorption box into the outside (such as the atmosphere). After being adsorbed by the adsorption box, the combustible gas concentration in the remaining gas is very small, which meets the emission standard at this time, so it can be discharged into the atmosphere.

In some examples, the combustible gas circulation processing equipment further includes a second concentration analyzer and a third concentration analyzer (ie, the second concentration meter and the third concentration meter described in the figure). The second concentration analyzer is arranged at the second outlet of the membrane separator, and is configured to measure the combustible gas concentration of the gas discharged from the second outlet of the membrane separator to obtain a second concentration value. The third concentration analyzer is arranged at the outlet of the adsorption box and is configured to measure the combustible gas concentration of the gas discharged from the outlet of the adsorption box to obtain a third concentration value. The second concentration value and the third concentration value respectively represent the combustible gas concentration of the gas discharged from the second outlet of the membrane separator before and after being adsorbed by the adsorption box. Through the first concentration value, the second concentration value and the third concentration value, the processing conditions of the membrane separator, the adsorption box and even the entire circulation treatment system can be comprehensively measured, so that the first, second and third concentration values can be integrated to adjust the above-mentioned At least one of a predetermined flow rate, a predetermined pressure, and a condensation temperature of the condenser.

In addition, as shown in FIG. 2 , the combustible gas circulation processing equipment may also include a thermal energy regulating circulation system located between the compressor and the condenser. The thermal energy regulating cycle system can regulate the thermal energy between the two devices of the compressor and the condenser, which determines the gas temperature between the gas from the compressor to the membrane separator.

For example, the liquid discharged from the gas-liquid separator can be introduced into the liquid storage tank, and the liquid level gauge is installed at the liquid storage tank. The liquid level gauge can detect the liquid volume state of the liquid storage tank, so that the liquid discharge speed of the gas-liquid separator can be obtained. . The liquid in the liquid storage tank can be introduced into the gasification burner through the pump circuit, so as to gasify and burn the generated liquid, and the gas after gasification and combustion can be discharged to the outside.

In addition, it should be noted that FIG. 2 is only a partial example of combustible gas circulation processing equipment, and it does not show the controller shown in FIG. 1 . However, the combustible body circulation processing equipment shown in FIG. 2 may include the controller shown in FIG. 1 and it may also realize various functions of the controller shown in FIG. 1 , so details will not be repeated here.

Although the above FIG. 1 only shows the controller 600 by taking a single component as an example, this is not a limitation to the embodiments of the present disclosure. The controller in the combustible gas circulation processing equipment according to the embodiment of the present disclosure can be a single controller, which is respectively connected with each device or part that needs to control or obtain signals; it can also be a plurality of different controllers, each The controller respectively realizes one or more functions mentioned above. In addition, the controller can be integrated with other components in the combustible gas processing equipment, or can be installed separately from other components, and its connection with other components can be a wired connection or a wireless communication connection. Embodiments of the present disclosure There is no particular limitation on this.

In the embodiments of the present disclosure, the above-mentioned various controllers or controller modules may be implemented by software so as to be executed by various types of processors. An identified module of executable code may, by way of example, comprise one or more physical or logical blocks of computer instructions which may, for example, be structured as an object, procedure, or function. Notwithstanding, the executable code of an identified module need not be physically located together, but may comprise distinct instructions stored on different physical locations which, when logically combined, constitute the module and carry out the stated purpose of the module .

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs and across multiple memory devices. Likewise, operational data may be identified within modules, and may be implemented in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed in different locations (including on different storage devices), and may exist, at least in part, only as electronic signals on a system or network.

When the module can be realized by software, considering the level of the existing hardware technology, the module that can be realized by software, regardless of the cost, those skilled in the art can build the corresponding hardware circuit to realize the corresponding function. The hardware circuit includes conventional very large scale integration (VLSI) circuits or gate arrays as well as existing semiconductors such as logic chips, transistors, or other discrete components. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices, and the like.

In addition, it should be noted that the inlet and outlet of each component in the figure are not shown in detail, but the flow direction of gas or liquid is shown in Figure 1 or Figure 2, and the gas or liquid flows into a certain component at the corresponding position Inlets are included, and outlets are included at corresponding locations for gas or liquid to flow out of a component. Therefore, the meanings of the inlets and outlets of the various components can be clearly and unambiguously determined from the written description and the drawings. In addition, certain components may include multiple inlets and/or multiple outlets, which are not particularly limited according to embodiments of the present disclosure.

Some embodiments according to the present disclosure provide a combustible gas circulation treatment method. The combustible gas circulation treatment method can be realized by using the above-mentioned combustible gas circulation treatment equipment, but there is no special limitation according to the embodiment of the present disclosure, and it can also be realized by using different combustible gas circulation treatment equipment, as long as the treatment method can realize Just follow the steps.

In some embodiments, the combustible gas circulation processing method includes: combustible gas collecting step: collecting gas containing combustible gas, and transporting it at a predetermined flow rate; gas compression step: compressing the gas collected in the combustible gas collecting step to a predetermined pressure; gas-liquid separation step: the compressed gas is introduced into the condenser for condensation, and the condensed gas is subjected to gas-liquid separation; membrane separation step: the gas separated from the gas-liquid separation is subjected to membrane separation using a membrane separator to forming a first portion of gas and a second portion of gas, the first portion having a combustible gas concentration greater than that of the second portion, and re-entering the first portion of gas into the combustible gas compression step for recycling; measuring the combustible gas concentration of the first part of the gas to obtain a first concentration value; and adjusting at least one of the predetermined flow rate, the predetermined pressure and the condensation temperature of the condenser according to the first concentration value .

In some examples, adjusting at least one of the predetermined flow rate, the predetermined pressure, and the condensation temperature of the condenser according to the first concentration value includes: comparing the first concentration value with the flammability of the collected gas. Gas concentration value, when the first concentration value is greater than the combustible gas concentration value of the collected gas and the difference between the two is less than 10% of the first concentration value, increase the predetermined pressure and/or Lower the condensation temperature of the condenser. The degree of enrichment of the combustible gas can be increased by raising the predetermined pressure and/or lowering the condensation temperature of the condenser.

In some examples, the liquid separated in the gas-liquid separation step is introduced into a liquid storage tank with a volume of V milliliters (ml). Adjusting at least one of the predetermined flow rate, the predetermined pressure, and the condensation temperature of the condenser according to the first concentration value includes: comparing the first concentration value with a combustible gas concentration value of the collected gas, When the first concentration value is greater than the combustible gas concentration value of the collected gas and the liquid discharge rate of gas-liquid separation is greater than zero and less than Vml/60min, increase the predetermined pressure and/or lower the condenser condensing temperature. Liquid discharge in gas-liquid separation indicates that the condensation is effective, but a relatively small liquid discharge rate indicates that the condensation efficiency is not high. At this time, by raising the predetermined pressure and/or lowering the condensation temperature of the condenser, the condensation efficiency can be improved and the liquid discharge speed can be accelerated.

In some examples, adjusting at least one of the predetermined flow rate, the predetermined pressure, and the condensation temperature of the condenser according to the first concentration value includes: comparing the first concentration value with the flammability of the collected gas. The gas concentration value, when the first concentration value is less than the combustible gas concentration value of the collected gas and the liquid discharge rate of gas-liquid separation is greater than Vml/60min, increase the predetermined flow rate. If the discharge speed of the liquid is fast, it means that most of the gas is liquefied quickly. At this time, by increasing the predetermined flow rate, the processing speed of the combustible gas on site can be accelerated and the processing efficiency can be improved.

In some examples, the condenser includes multi-stage refrigeration units with different condensation temperatures, and the method further includes turning on one or more stages of refrigeration units of the condenser according to the type of combustible gas in the collected gas.

In some examples, the combustible gas circulation treatment method further includes: performing waste gas treatment on the second part of the gas. For example, the combustible gas in the adsorption box is adsorbed, and the unadsorbed gas is discharged through the outlet of the adsorption box, and the combustible gas concentration is measured for the second part of the gas to obtain a second concentration value; The combustible gas concentration is measured to obtain a third concentration value of the gas discharged at the outlet of the outlet, and the predetermined flow rate, the predetermined pressure and the predetermined pressure are adjusted according to the first concentration value, the second concentration value and the third concentration value at least one of the condensation temperatures of the condenser. For example, the combustible gas adsorbed by the adsorption box can be sucked out by a vacuum pump, and then transported back to the gas compression step for recycling treatment.

In some examples, the gas compressing step includes: introducing the collected gas into a buffer tank, introducing the gas from the buffer tank into a compressor for compression, and connecting a pressure reducing valve between the outlet of the compressor and the buffer tank , the pressure reducing valve is configured to open when the pressure is greater than or equal to a threshold value, so as to conduct the passage from the outlet of the compressor to the second inlet of the buffer tank, and the combustible gas circulates The processing method further includes: adjusting the pressure threshold according to the predetermined pressure, so that the pressure threshold is higher than the predetermined pressure.

In the combustible gas circulation treatment method according to the embodiment of the present disclosure, the combustible gas collection step, the gas compression step, the gas-liquid separation step and the membrane separation step may be performed continuously. For example, in the initial stage, it can be operated with preset parameters according to the types of combustible gases emitted unorganizedly on site, such as propylene and other hydrocarbon combustible gases. A first concentration value is measured during processing. Since the method for treating combustible gas according to the embodiments of the present disclosure can be performed in a continuous cycle, the operating parameters of various devices or parts in the combustible gas processing equipment can be adjusted by detecting the first concentration value in real time.

For example, in an embodiment according to the present disclosure, the type of collected combustible gas can be detected by an external detection device. For example, determine the type of combustible gas by infrared analyzer. For example, the combustible gas circulation treatment device and the combustible gas circulation treatment method according to the present disclosure may process combustible gases including various hydrocarbons, but embodiments of the present disclosure are not limited thereto.

It should be noted that the combustible gas circulation treatment method in the embodiment of the present disclosure can be realized by the above-mentioned combustible gas circulation treatment device, therefore, the above description based on the combustible gas circulation device can also be applied to the combustible gas circulation according to the embodiment of the present disclosure The treatment method, the parts not described in the combustible gas circulation treatment method, including technical solutions and achieved technical effects, etc., can all be described in the above-mentioned combustible gas circulation treatment device.

The following points need to be explained:

(1) In the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are involved, and other structures may refer to general designs.

(2) In the case of no conflict, features in the same embodiment and different embodiments of the present disclosure can be combined with each other.

The above is only a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope of the present disclosure, and should cover all within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be determined by the protection scope of the claims.

Claims (14)

1. A combustible gas circulation treatment equipment, comprising:

   a combustible gas collection device configured to collect and deliver gas at a predetermined flow rate;

   a gas compression device connected to the outlet of the combustible gas collection device and configured to compress the gas to a predetermined pressure and discharge it;

   The gas-liquid separation device comprises a condenser and a gas-liquid separator, the inlet of the condenser is connected to the outlet of the gas compression device, the outlet of the condenser is connected to the gas-liquid separator, and the gas-liquid separator configured to separate gas and liquid from condensed gas, and comprising a gas outlet for discharging gas and a liquid outlet for discharging liquid,

   The membrane separator is connected to the gas outlet of the gas separator, includes a first outlet and a second outlet, and is configured to enrich the combustible gas and discharge it from the first outlet, and discharge the remaining gas from the second outlet. The second outlet is discharged, and the first outlet is connected to the gas compression device, so that the gas discharged from the first outlet is sent to the gas compression device again for recycling treatment;

   a first concentration analyzer, arranged at the first outlet of the membrane separator, and configured to measure the combustible gas concentration of the gas discharged from the first outlet of the membrane separator to obtain a first concentration value;

   A controller configured to adjust at least one of the predetermined flow rate, the predetermined pressure, and the condensation temperature of the condenser according to the first concentration value.
2. The combustible gas circulation treatment device according to claim 1, wherein adjusting at least one of the predetermined flow rate, the predetermined pressure and the condensation temperature of the condenser according to the first concentration value comprises:

   Comparing the first concentration value with the combustible gas concentration value at the inlet of the combustible gas collection device, when the first concentration value is greater than the combustible gas concentration value at the inlet of the combustible gas collection device and the difference between the two In the case of less than 10% of the first concentration value, the predetermined pressure is increased and/or the condensation temperature is decreased.
3. The combustible gas circulation treatment device according to claim 1, wherein the gas-liquid separation device comprises a liquid storage tank connected to the liquid outlet of the gas-liquid separator, the volume of the liquid storage tank is Vml,

   Adjusting at least one of the predetermined flow rate, the predetermined pressure, and the condensation temperature of the condenser according to the first concentration value includes:

   Comparing the first concentration value with the combustible gas concentration value at the inlet of the combustible gas collection device, when the first concentration value is greater than the combustible gas concentration value at the inlet of the combustible gas collection device and the gas-liquid When the liquid discharge rate of the liquid outlet of the separator is greater than zero and less than Vml/60min, the predetermined pressure is increased and/or the condensation temperature is decreased.
4. The combustible gas circulation treatment device according to any one of claims 1-3, wherein the gas-liquid separation device includes a liquid storage tank connected to the liquid outlet of the gas-liquid separator, and the volume of the liquid storage tank is for Vml,

   Adjusting at least one of the predetermined flow rate, the predetermined pressure, and the condensation temperature of the condenser according to the first concentration value includes:

   Comparing the first concentration value with the combustible gas concentration value at the inlet of the combustible gas collection device, the first concentration value is smaller than the combustible gas concentration value at the inlet of the combustible gas collection device, and the gas-liquid separation When the liquid discharge rate of the liquid outlet of the device is greater than or equal to Vml/60min, increase the predetermined flow rate.
5. The combustible gas circulation processing device according to claim 1, wherein the condenser includes multi-stage refrigeration units with different condensation temperatures, and the controller is configured to turn on the condenser according to the type of combustible gas collected One or more stages of refrigeration units.
6. The combustible gas circulation processing equipment according to any one of claims 1-5, further comprising:

   The exhaust gas treatment device includes an adsorption box, the inlet of the adsorption box is connected to the second outlet of the membrane separator, so as to absorb the combustible gas entering the adsorption box, and pass the unadsorbed gas through the adsorption box outlet discharge,

   The second concentration analyzer is arranged at the second outlet of the membrane separator and configured to measure the combustible gas concentration of the gas discharged from the second outlet of the membrane separator to obtain a second concentration value;

   The third concentration analyzer is arranged at the outlet of the adsorption box and configured to measure the combustible gas concentration of the gas discharged from the outlet of the adsorption box to obtain a third concentration value,

   Wherein, the controller is further configured to adjust the predetermined flow rate, the predetermined pressure and the condensation temperature of the condenser according to the first concentration value, the second concentration value and the third concentration value at least one of the .
7. The combustible gas circulation treatment device according to any one of claims 1-5, wherein the gas compression device includes a buffer tank, a compressor and a pressure relief valve, and the outlet of the gas collection device is connected to the buffer tank The first inlet, the outlet of the buffer tank is connected to the inlet of the compressor, the outlet of the compressor is connected to the second inlet of the buffer tank through the pressure reducing valve, and the pressure reducing valve is configured to opening at a pressure greater than or equal to a threshold to conduct a passage from the outlet of the compressor to the second inlet of the surge tank,

   The controller is further configured to adjust the pressure threshold based on the predetermined pressure such that the pressure threshold is higher than the predetermined pressure.
8. A combustible gas circulation treatment method, comprising:

   Combustible gas collection step: collecting gas containing combustible gas and delivering it at a predetermined flow rate;

   Gas compression step: compressing the gas collected in the combustible gas collection step to a predetermined pressure;

   Gas-liquid separation step: the compressed gas is introduced into the condenser for condensation, and the condensed gas is separated into gas and liquid;

   Membrane separation step: using a membrane separator to perform membrane separation on the separated gas after gas-liquid separation to form a first part of gas and a second part of gas, the concentration of combustible gas in the first part is greater than the concentration of combustible gas in the second part , and reintroduce the first part of the gas into the combustible gas compression step for recycling;

   measuring the combustible gas concentration of the first portion of gas to obtain a first concentration value; and

   At least one of the predetermined flow rate, the predetermined pressure, and the condensation temperature of the condenser is adjusted according to the first concentration value.
9. The combustible gas circulation treatment method according to claim 8, wherein adjusting at least one of the predetermined flow rate, the predetermined pressure and the condensation temperature of the condenser according to the first concentration value comprises:

   Comparing the first concentration value with the combustible gas concentration value of the collected gas, when the first concentration value is greater than the combustible gas concentration value of the collected gas and the difference between the two is less than 10% of the first concentration value In the case of , increase the predetermined pressure and/or decrease the condensation temperature of the condenser.
10. The combustible gas circulation treatment method according to claim 8, wherein the liquid separated in the gas-liquid separation step is introduced into a liquid storage tank with a volume of Vml,

    Adjusting at least one of the predetermined flow rate, the predetermined pressure, and the condensation temperature of the condenser according to the first concentration value includes:

    Comparing the first concentration value with the combustible gas concentration value of the collected gas, when the first concentration value is greater than the combustible gas concentration value of the collected gas and the liquid discharge rate of gas-liquid separation is greater than zero and less than Vml/60min In the case of , increase the predetermined pressure and/or decrease the condensation temperature of the condenser.
11. The combustible gas circulation treatment method according to any one of claims 8-10, wherein the liquid separated in the gas-liquid separation step is introduced into a liquid storage tank with a volume of Vml,

    Adjusting at least one of the predetermined flow rate, the predetermined pressure, and the condensation temperature of the condenser according to the first concentration value includes:

    Comparing the first concentration value with the combustible gas concentration value of the collected gas, when the first concentration value is less than the combustible gas concentration value of the collected gas and the liquid discharge rate of gas-liquid separation is greater than or equal to Vml/60min case, increase the predetermined flow rate.
12. The combustible gas circulation treatment method according to claim 8, wherein the condenser includes a multi-stage refrigeration unit with different condensation temperatures, and the method further includes turning on the condenser according to the type of combustible gas in the collected gas One or more stages of refrigeration units.
13. The combustible gas circulation treatment method according to any one of claims 8-12, further comprising:

    Adsorb the combustible gas in the second part of the gas through the adsorption box, and discharge the unadsorbed gas through the outlet of the adsorption box,

    performing a combustible gas concentration measurement on the second portion of the gas to obtain a second concentration value;

    performing combustible gas concentration measurement on the gas discharged from the outlet of the adsorption box to obtain a third concentration value,

    At least one of the predetermined flow rate, the predetermined pressure and the condensation temperature of the condenser is adjusted according to the first concentration value, the second concentration value and the third concentration value.
14. The combustible gas circulation treatment method according to any one of claims 8-12, wherein the gas compression step comprises: introducing the collected gas into a buffer tank, introducing the gas from the buffer tank into a compressor for compression, and A decompression valve is connected between the outlet of the compressor and the buffer tank, and the decompression valve is configured to open when the pressure is greater than or equal to a threshold value, so as to lead from the outlet of the compressor to the The passage between the second inlet of the buffer tank,

    The combustible gas circulation processing method further includes: adjusting the pressure threshold according to the predetermined pressure, so that the pressure threshold is higher than the predetermined pressure.

Images