A device and method for treating low-concentration acid gas in a combined natural gas purification plant
A treatment method and low-concentration technology, which is applied in the field of low-concentration acid gas treatment devices in combined natural gas purification plants, can solve the problems of high operating costs and low sulfur recovery rates, and achieve the effects of reducing operating costs and increasing sulfur recovery rates
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Embodiment 1
[0039] The invention is a combined type natural gas purification plant low-concentration acid gas treatment method developed for the problems of low sulfur recovery rate and high operating cost in the treatment of low-concentration acid gas in the current natural gas purification plant. It adopts a new type of high-selectivity solid-phase catalyst oxidation process in series with liquid-phase oxidation process, which successfully solves the problems of low sulfur recovery rate and high operating cost in natural gas purification plants for low-concentration acid gas treatment.
[0040] The present invention provides as figure 1 The low-concentration sour gas treatment device and method of a combined natural gas purification plant shown are very effective for low-H 2 S concentration (H 2 S<15%) sour gas treatment process to meet the increasingly stringent emission standards.
[0041] Such as figure 1 As shown, it includes a solid-phase oxidation reaction device and a liquid-p...
Embodiment 2
[0049] A filter 17 is connected to the upper and lower outlets of the absorption oxidation tower 16 , and an air blower 18 is arranged between the filter 17 and the absorption oxidation tower 16 .
[0050] The tail gas exiting the secondary sulfur condensation separator 12 is cooled to 50°C through the tail gas cooler 14 and enters the absorption oxidation tower 16 through the gas-liquid separator 15, and the H2S gas in the tail gas reacts and absorbs with the alkaline solution in the absorption oxidation tower 16, It reacts with the chelated iron in the absorption oxidation tower 16 to generate sulfur element; the air passes through the filter 17 and enters the air blower 18 for pressurization, and then enters the absorption oxidation tower 16 to oxidize and regenerate iron ions for recycling.
Embodiment 3
[0052] The absorption and oxidation tower 16 is conical, and the outlet of the conical bottom of the absorption and oxidation tower 16 is connected with a sulfur slurry pump 19 .
[0053] It also includes a heat exchanger 21 , the two ends of the heat exchanger 21 are connected to the absorption oxidation tower 16 , and a solution circulation pump 20 is arranged between the heat exchanger 21 and the absorption oxidation tower 16 .
[0054] When the concentration of the sulfur slurry at the bottom of the vertebral body of the absorption and oxidation tower 16 reaches more than 5%, it is pumped by the sulfur slurry pump 19 to a belt filter to remove moisture to obtain 60.0% (wt) sulfur cake. SO in the up-to-standard tail gas discharged from the absorption oxidation tower 16 2 and H 2 The S concentration is less than 10ppm (v). The solution in the absorption oxidation tower enters the heat exchanger 21 through the solution circulation pump 20 to maintain a constant temperature ...
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