Safe pressurization system for air-light hydrocarbon mixed fuel gas

Abstract

The utility model discloses a safe pressurization system for air-light hydrocarbon mixed fuel gas. The device at least comprises a fuel gas buffer tank and a gas storage tank, the buffer tank is used for buffering the air-light hydrocarbon mixed gas; a primary compressor; the pressurizing device is used for pressurizing the fuel gas output by the fuel gas buffer tank to 0.15 MPa; the first-stage cooler is used for cooling the fuel gas output by the first-stage compressor for the first time; the secondary cooler is used for cooling the fuel gas again; and the second-stage compressor is used for pressurizing the fuel gas cooled by the first-stage cooler to 0.3 MPa. By means of two-stage pressurization and two-stage cooling, pressurization safety control of large-flow 6000 Nm < 3 > / h pentane air-mixed fuel gas is well achieved.

Description

Technical Field

[0001] This utility model relates to a safe booster system for mixed-air light hydrocarbon gas. Background Technology

[0002] Mixed-air light hydrocarbon gas is a new type of green energy, produced by gasifying liquid light hydrocarbons and mixing them with air. Its main feedstock is a mixture of pentane and other hydrocarbons, a byproduct of oil and gas fields and refineries. It has been listed by the Ministry of Housing and Urban-Rural Development as the fourth type of city gas after manufactured gas, natural gas, and liquefied petroleum gas.

[0003] However, in solving the problem of high-pressure gas transmission, especially in the pressurization safety control of a large flow rate of 6000 Nm³ / h pentane mixed air gas, many problems were encountered: 1) The flow velocity in a DN200 pipeline at 6000 Nm³ / h reached 21.6 m / s, far exceeding the safety limit of >15 m / s; 2) Single-stage pressurization (compression) can easily lead to a gas temperature >260℃, which will cause the auto-ignition point of pentane to be affected; 3) Traditional coolers can reduce the gas temperature to 25℃, which may cause pentane liquefaction and pose a risk of condensation. Utility Model Content

[0004] To overcome the above-mentioned defects, the purpose of this utility model is to provide a safe booster system for mixed air and light hydrocarbon fuel gas.

[0005] To achieve the above objectives, the air-mixing light hydrocarbon gas safety booster system of this utility model includes at least the following components arranged sequentially via pipelines:

[0006] Gas buffer tank; used to buffer light hydrocarbon fuel gas in air mixtures;

[0007] A single-stage compressor; used to pressurize the gas output from the gas buffer tank to 0.15 MPa;

[0008] The first-stage cooler is used to cool the gas output from the first-stage compressor for the first time.

[0009] A secondary cooler is used to further cool the gas.

[0010] The secondary compressor is used to pressurize the gas cooled by the secondary cooler to 0.3 MPa.

[0011] Furthermore, the system specifically refers to:

[0012] Gas buffer tank; used to buffer light hydrocarbon fuel gas in air mixtures;

[0013] A single-stage compressor; used to pressurize the gas output from the gas buffer tank to 0.15 MPa;

[0014] The first main pipeline is used to transmit the gas output from the first-stage compressor;

[0015] The first branch of multiple parallel pipes is equipped with a first-stage cooler to cool the gas output from the main pipe for the first time.

[0016] The second main pipeline is used to combine and transmit the gas from each of the first branch pipelines after it has been cooled.

[0017] The secondary cooler is a water-cooled cooler, used to further cool the combined gas.

[0018] The two-stage compressor is used to pressurize the cooled gas to 0.3 MPa;

[0019] The second pipeline is used to transmit the recompressed gas.

[0020] Furthermore, the diameter of the main pipeline is DN250-DN300.

[0021] Furthermore, the diameter of the branch pipes is DN150-DN200.

[0022] Furthermore, the primary compressor is a screw compressor.

[0023] Furthermore, the secondary compressor is a reciprocating compressor.

[0024] Furthermore, the primary compressor and / or secondary compressor are variable frequency compressors;

[0025] Pressure sensors and / or temperature sensors are installed in the main pipeline and / or branch pipeline;

[0026] A control device for controlling the speed of a variable frequency compressor based on the output of a pressure sensor and / or a temperature sensor.

[0027] This invention effectively solves the problems of temperature rise, overspeed, and condensation during the pressurization process of 6000 Nm³ / h pentane mixed-air gas by using two-stage pressurization and two-stage cooling. The system has an energy efficiency ratio of ≥90% and its safety meets the GB / T 20801-2020 standard. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model.

[0029] Figure 2 This is a schematic diagram of an embodiment of the present invention. Detailed Implementation

[0030] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0031] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] like Figure 1 As shown, the air-mixed light hydrocarbon gas safety booster system of this utility model includes at least the following components arranged sequentially through pipelines:

[0035] The system comprises at least the following components arranged sequentially via pipes:

[0036] Gas buffer tank; used to buffer light hydrocarbon fuel gas in air mixtures;

[0037] The first-stage compressor is used to pressurize the gas output from the gas buffer tank to 0.15 MPa. After pressurization, the temperature of the gas in the pipeline is generally between 160 and 180 degrees Celsius.

[0038] The primary cooler is used to cool the gas output from the primary compressor for the first time, generally to below 100 degrees Celsius. The primary cooler uses air cooling to save energy. The temperature reduced by the primary cooler varies depending on the season. If the predetermined temperature cannot be reached, a secondary cooler is installed to cool the gas again. The secondary cooler is a water-cooled cooler, and the water flow can be adjusted as needed to ensure that the temperature is reduced to below 100 degrees Celsius.

[0039] The secondary compressor is used to pressurize the gas cooled by the cooler to 0.3 MPa. The pressurized gas can meet the pressure and temperature requirements of blast furnace gas. Example

[0040] Figure 2 The figure shows a specific embodiment of this utility model.

[0041] Gas buffer tank; used to buffer light hydrocarbon fuel gas in air mixtures;

[0042] The primary compressor is used to pressurize the gas output from the gas buffer tank to 0.15 MPa; the primary compressor is a screw compressor. For example, the LG-132W screw compressor has a flow rate of 6000 Nm³ / h and an outlet pressure of 0.15 MPa.

[0043] Variable frequency control, explosion-proof rating ExdⅡBT4.

[0044] The first main pipeline is used to transmit the gas output from the first-stage compressor (flow velocity 13.8 m / s); the diameter of the main pipeline is DN250-DN300.

[0045] The system consists of multiple parallel first-branch pipes (flow velocity ≤ 10m / s), each equipped with a primary cooler to initially cool the gas output from the main pipe; the primary cooler comprises three air-cooled units. For example, the FLQ-40 finned tube heat exchanger has an area of ​​40㎡ / unit, with three units operating in parallel, and features aluminum fins. The branch pipe diameter is DN150-DN200.

[0046] The second main pipeline is used to combine and transmit the gas from each of the first branch pipelines after cooling; the diameter of the main pipeline is DN250-DN300.

[0047] The secondary cooler is a water-cooled cooler used to further cool the gas in the second main pipeline; the secondary cooler is a plate water cooler, such as BR06-45, with a heat exchange area of ​​45㎡ and made of 316L stainless steel plates.

[0048] The two-stage compressor is used to pressurize the gas to 0.3MPa; the two-stage compressor is a reciprocating compressor. For example, the DW-75 reciprocating compressor has a flow rate of 6200 Nm³ / h and an outlet pressure of 0.3MPa, and is equipped with an interstage cooling jacket.

[0049] The second pipeline is used to transmit the gas after it has been cooled down again.

[0050] Pressure sensors and / or temperature sensors are installed in the main pipeline and / or branch pipelines; the temperature sensor can be an integrated PT100 with a range of 0-300℃ and an accuracy of ±0.5%; the pressure transmitter can be an EJA530A-DMS5A22 with a range of 0-0.5MPa and an accuracy of 0.1%.

[0051] The control unit is used to control the speed of the variable frequency compressor based on the output of pressure and / or temperature sensors. The control unit can be a PLC, such as PLC-S7-1200.

[0052] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Many other changes and modifications made without departing from the concept and scope of the present invention should be considered within the protection scope of the present invention.

[0053] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0054] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A safe booster system for mixed-air light hydrocarbon fuel gas, characterized in that, The system comprises at least the following components arranged sequentially via pipes: Gas buffer tank; used to buffer light hydrocarbon fuel gas in air mixtures; A single-stage compressor; used to pressurize the gas output from the gas buffer tank to 0.15 MPa; The first-stage cooler is used to cool the gas output from the first-stage compressor for the first time. A secondary cooler is used to further cool the gas. The secondary compressor is used to pressurize the gas cooled by the secondary cooler to 0.3 MPa.

2. The air-mixed light hydrocarbon gas safety booster system as described in claim 1, characterized in that, The system in question is specifically as follows: Gas buffer tank; used to buffer light hydrocarbon fuel gas in air mixtures; A single-stage compressor; used to pressurize the gas output from the gas buffer tank to 0.15 MPa; The first main pipeline is used to transmit the gas output from the first-stage compressor; The first branch of multiple parallel pipes is equipped with a first-stage cooler to cool the gas output from the main pipe for the first time. The second main pipeline is used to combine and transmit the gas from each of the first branch pipelines after it has been cooled. The secondary cooler is a water-cooled cooler, used to further cool the combined gas. The two-stage compressor is used to pressurize the cooled gas to 0.3 MPa; The second pipeline is used to transmit the recompressed gas.

3. The air-mixed light hydrocarbon gas safety booster system as described in claim 2, characterized in that, The diameter of the main pipeline is DN250-DN300.

4. The air-mixed light hydrocarbon gas safety booster system as described in claim 2, characterized in that, The diameter of the branch pipes is DN150-DN200.

5. The air-mixed light hydrocarbon gas safety booster system as described in claim 1, characterized in that, The primary compressor is a screw compressor.

6. The air-mixed light hydrocarbon gas safety booster system as described in claim 1, characterized in that, The secondary compressor is a reciprocating compressor.

7. The air-mixed light hydrocarbon gas safety booster system as described in claim 1, characterized in that, The primary compressor and / or secondary compressor are variable frequency compressors; Pressure sensors and / or temperature sensors are installed in the main pipeline and / or branch pipeline; A control device for controlling the speed of a variable frequency compressor based on the output of a pressure sensor and / or a temperature sensor.

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