A system for blending syngas and natural gas

Abstract

The application provides a synthetic gas and natural gas blending system and belongs to the technical field of energy utilization. The system comprises a natural gas metering device, a filtering device, a natural gas pressure regulating device, a synthetic gas metering device, a purification device, a synthetic gas pressure regulating device, a fuel gas mixing device, a buffer tank and a pressure stabilizing device. The system blends the synthetic gas and the natural gas to form mixed fuel gas, makes up for the deficiency of the synthetic gas in the heat value and the combustion stability by utilizing the characteristics of the stable combustion and the high heat value of the natural gas, and thus meets the requirement of the combustion equipment on the fuel quality; blending the synthetic gas in a certain proportion can reduce the consumption of the natural gas and thus reduces the fuel cost.

Description

Technical Field

[0001] This invention relates to the field of energy utilization, and more specifically to a blending system for syngas and natural gas. Background Technology

[0002] my country's energy resources are characterized by "abundant coal, scarce oil, and limited natural gas," with coal, oil, and natural gas accounting for 91.9%, 4.8%, and 3.3% of its total reserves, respectively. Coal reserves account for a significantly larger share than oil and natural gas reserves. Natural gas is a high-quality fuel with stable combustion and high calorific value, but domestic production is limited, resulting in a supply-demand gap and reliance on imports. This leads to significant price fluctuations and high costs. Syngas is primarily produced from coal through coal gasification technology, where coal reacts with a gasifying agent at high temperatures. Syngas feedstock reserves are abundant, giving it a cost advantage over natural gas in regions with sufficient supply. However, using syngas alone has significant drawbacks: firstly, its calorific value is relatively low, making it difficult to meet the demands of combustion equipment when burned alone; secondly, its combustion stability is poor.

[0003] Therefore, blending syngas and natural gas to form a mixed fuel gas can effectively combine the advantages of both. On the one hand, the stable combustion and high calorific value of natural gas can be used to compensate for the deficiencies of syngas in terms of calorific value and combustion stability, thereby meeting the fuel quality requirements of combustion equipment. On the other hand, by blending a certain proportion of syngas, the consumption of natural gas can be reduced, thereby lowering fuel costs. Summary of the Invention

[0004] The present invention aims to provide a blending system for syngas and natural gas to replace part of the natural gas consumption and reduce fuel costs.

[0005] To achieve the above objectives, the present invention employs the following technical solution: A blending system for syngas and natural gas includes a natural gas metering device, a filtration device, a natural gas pressure regulating device, a syngas metering device, a purification device, a syngas pressure regulating device, a fuel gas mixing device, a buffer tank, and a pressure stabilizing device. The outlet of the natural gas metering device is connected in sequence to the filter device and the natural gas pressure regulating device; The natural gas pressure regulating device is connected to the natural gas inlet of the fuel gas mixing device; The outlet of the syngas metering device is connected in sequence to the purification device and the syngas pressure regulating device; The syngas pressure regulating device is connected to the syngas inlet of the fuel gas mixing device; The mixed gas outlet of the fuel gas mixing device is sequentially connected to the buffer tank and the pressure stabilizing device.

[0006] Furthermore, the inlet of the natural gas metering device is connected to a natural gas pipeline, and a natural gas isolation valve and a natural gas emergency shut-off valve are sequentially installed between the natural gas pipeline and the natural gas metering device. Furthermore, the inlet of the syngas metering device is connected to the syngas pipeline, and a syngas isolation valve and a syngas emergency shut-off valve are sequentially provided between the syngas pipeline and the syngas metering device.

[0007] Furthermore, a natural gas regulating valve is provided between the natural gas pressure regulating device and the fuel gas mixing device.

[0008] Furthermore, a syngas regulating valve is provided between the syngas pressure regulating device and the fuel gas mixing device.

[0009] Furthermore, the filtration device and the purification device are respectively connected to the condensate tank, and the condensate tank is connected to the flare system.

[0010] Compared with conventional technologies, the beneficial effects of this invention are: by blending syngas and natural gas to form a mixed fuel gas, the stable combustion and high calorific value of natural gas are utilized to compensate for the deficiencies of syngas in terms of calorific value and combustion stability, thereby meeting the fuel quality requirements of combustion equipment; by blending a certain proportion of syngas, the consumption of natural gas can be reduced, thereby reducing fuel costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the system structure of the present invention. Wherein: 1-Natural gas isolation valve; 2-Natural gas emergency shut-off valve; 3-Synthetic gas isolation valve; 4-Synthetic gas emergency shut-off valve; 5-Flame system; 6-Fuel gas mixing device; 7-Natural gas regulating valve; 8-Synthetic gas regulating valve; 9-Natural gas metering device; 10-Filtering device; 11-Natural gas pressure regulating device; 12-Synthetic gas metering device; 13-Purification device; 14-Synthetic gas pressure regulating device; 15-Pressure stabilizing tank; 16-Condensate tank; 17-Pressure stabilizing device. Detailed Implementation

[0012] The present invention will now be described in further detail with reference to the accompanying drawings: like Figure 1 As shown, the blending system for syngas and natural gas according to the present invention includes a natural gas isolation valve 1, a natural gas emergency shut-off valve 2, a syngas isolation valve 3, a syngas emergency shut-off valve 4, a flare system 5, a fuel gas mixing device 6, a natural gas regulating valve 7, a syngas regulating valve 8, a natural gas metering device 9, a filter device 10, a natural gas pressure regulating device 11, a syngas metering device 12, a purification device 13, a syngas pressure regulating device 14, a pressure stabilizing tank 15, a condensate tank 16, and a pressure stabilizing device 17.

[0013] The outlet of the natural gas metering device 9 is connected in sequence to the filter device 10 and the natural gas pressure regulating device 11. The natural gas pressure regulating device 11 is connected to the natural gas inlet of the fuel gas mixing device 6.

[0014] The outlet of the syngas metering device 12 is connected in sequence to the purification device 13 and the syngas pressure regulating device 14. The syngas pressure regulating device 14 is connected to the syngas inlet of the fuel gas mixing device 6.

[0015] The outlet of the fuel gas mixing device 6 is connected in sequence to the buffer tank 15 and the pressure stabilizing device 17.

[0016] The inlet of the natural gas metering device 9 is connected to the natural gas pipeline. A natural gas isolation valve 1 and a natural gas emergency shut-off valve 2 are sequentially installed between the natural gas pipeline and the natural gas metering device 9. The natural gas isolation valve 1 is used to manually open and close the natural gas source; the natural gas emergency shut-off valve 2 can quickly close the valve and cut off the natural gas source in an emergency.

[0017] The inlet of the syngas metering device 12 is connected to the syngas pipeline. A syngas isolation valve 3 and a syngas emergency shut-off valve 4 are sequentially installed between the syngas pipeline and the syngas metering device 12. The syngas isolation valve 3 is used to manually open and close the syngas source; the syngas emergency shut-off valve 4 can quickly close the valve and cut off the syngas source in an emergency.

[0018] A natural gas regulating valve 7 is provided between the natural gas pressure regulating device 11 and the fuel gas mixing device 6. A syngas regulating valve 8 is provided between the syngas pressure regulating device 14 and the fuel gas mixing device 6. The regulating opening degree of the natural gas regulating valve 7 and the syngas regulating valve 8 is 0-100%, which can realize the mixing of natural gas and syngas in any proportion.

[0019] The filter device 10 and the purification device 13 are respectively connected to the condensate tank 16, which is connected to the flare system 5. The flare system 5 treats the toxic synthesis gas by combustion, preventing it from being directly released into the atmosphere to protect human health.

[0020] This invention also provides specific operation of a syngas and natural gas blending system: (1) The natural gas in the natural gas pipeline passes through the natural gas isolation valve 1, the natural gas emergency shut-off valve 2, the natural gas metering device 9, the filter device 10, the natural gas pressure regulating device 11, and the natural gas regulating valve 7 in sequence, and enters the fuel gas mixing device 6; (2) The natural gas in the syngas pipeline passes through the syngas isolation valve 3, the syngas emergency shut-off valve 4, the syngas metering device 12, the purification device 13, the syngas pressure regulating device 14, and the syngas regulating valve 8 in sequence, and enters the fuel gas mixing device 6. (3) The mixed gas in the fuel gas mixing device 6 passes through the buffer tank 15 and the pressure stabilizing device 17 in sequence, and then the mixed gas is sent to the user through the mixed gas pipeline; (4) The filter device 10 and the purification device 13 send the liquid impurities in the natural gas or syngas into the condensate tank 16 for temporary storage. The gas balance interface of the condensate tank 16 is connected to the flare system 5. The toxic syngas is treated by combustion to prevent the syngas from being directly discharged into the atmosphere, so as to protect human health.

Claims

1. A blending system for syngas and natural gas, characterized in that, It includes a natural gas metering device (9), a filter device (10), a natural gas pressure regulating device (11), a syngas metering device (12), a purification device (13), a syngas pressure regulating device (14), a fuel gas mixing device (6), a buffer tank (15), and a pressure stabilizing device (17). The outlet of the natural gas metering device (9) is connected in sequence to the filter device (10) and the natural gas pressure regulating device (11); the natural gas pressure regulating device (11) is connected to the natural gas inlet of the fuel gas mixing device (6); The outlet of the syngas metering device (12) is connected in sequence to the purification device (13) and the syngas pressure regulating device (14); the syngas pressure regulating device (14) is connected to the syngas inlet of the fuel gas mixing device (6); The outlet of the fuel gas mixing device (6) is connected in sequence to the buffer tank (15) and the pressure stabilizing device (17).

2. The syngas and natural gas blending system according to claim 1, characterized in that, The inlet of the natural gas metering device (9) is connected to the natural gas pipeline, and a natural gas isolation valve (1) and a natural gas emergency shut-off valve (2) are sequentially provided between the natural gas pipeline and the natural gas metering device (9).

3. The syngas and natural gas blending system according to claim 1, characterized in that, The inlet of the syngas metering device (12) is connected to the syngas pipeline, and a syngas isolation valve (3) and a syngas emergency shut-off valve (4) are sequentially provided between the syngas pipeline and the syngas metering device (12).

4. The syngas and natural gas blending system according to claim 1, characterized in that, A natural gas regulating valve (7) is provided between the natural gas pressure regulating device (11) and the fuel gas mixing device (6).

5. The syngas and natural gas blending system according to claim 1, characterized in that, A syngas regulating valve (8) is provided between the syngas pressure regulating device (14) and the fuel gas mixing device (6).

6. The syngas and natural gas blending system according to claim 1, characterized in that, The filtration device (10) and purification device (13) are respectively connected to the condensate tank (16), and the condensate tank (16) is connected to the flare system (5).

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