Pressure swing adsorption gas separation method for recycling displacement waste gas and directly-discharged gas
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A pressure swing adsorption and gas separation technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of limited implementation scope, high investment, complex process, etc., to reduce material consumption, energy consumption, investment Less and simpler process
Inactive Publication Date: 2015-07-01
SICHUAN TIANYI SCI & TECH
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[0007] Patent ZL200510118241.7, patent ZL200510129369.3, patent ZL201210394237.3 and patent ZL201410271598.8 disclose recycling methods involving the replacement of waste gas, but not related to the recycling method of exhaust gas, and these recycling methods of replacing waste gas are all through It is realized by combining two or more sets of adsorption devices including pressure swing adsorption gas separation devices, which not only requires high investment and complicated process, but also has various restrictions on the scope of implementation
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Embodiment 1
[0034] This embodiment is a pressure swing adsorption separation device for separating and recovering carbon monoxide from water gas, and the flow rate of fresh raw gas is 500Nm 3 / h, the adsorption pressure is 0.25MPa gauge pressure, the feed gas temperature is 40°C, and the fresh feed gas composition is shown in Table 1:
[0035] Table 1 Composition of fresh feed gas
[0036]
[0037] The volume of the adsorption tower of the pressure swing adsorption device in this embodiment is 5m 3 , where the loaded adsorbents are molecular sieve, activated carbon, and activated alumina from top to bottom, and the filling height ratio is 4:1:1. The device consists of 4 adsorption towers, 1 reverse tank, 1 vacuum tank, 3 vacuum pumps, 1 displacement waste gas buffer tank, 1 product mixing tank, 1 displacement gas buffer tank, 1 displacement gas compressor, 1 It is formed by connecting one product air compressor, one return air compressor and corresponding pipelines and program-contro...
Embodiment 2
[0055] This embodiment is a coke oven gas enrichment methane device after conversion and removal of carbon dioxide, and the coke oven gas flow rate is 42000Nm 3 / h, the adsorption pressure is 0.95MPa gauge pressure, the feed gas temperature is 30°C, and the fresh feed gas composition is shown in Table 4:
[0056] Table 4 Composition of Fresh Raw Gas
[0057]
[0058] The volume of adsorption tower is 90m in the present embodiment 3 The adsorbents filled in it are mainly activated alumina and activated carbon. The device consists of 8 adsorption towers, 2 reverse tanks, 2 product mixing tanks, 1 replacement waste gas buffer tank, 1 intermediate tank, and 1 replacement gas The buffer tank, vacuum pump unit, product gas compressor, displacement gas compressor, return gas compressor and corresponding pipelines and program-controlled valves are connected. Each adsorption tower sequentially undergoes adsorption A, first-average drop E1D, second-average drop E2D, third-average d...
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Abstract
The invention discloses a pressure swing adsorption gas separation method for recycling displacement waste gas and directly-discharged gas. According to the method, all or one part of the displacement waste gas flowing out from an adsorption tower is displaced by a pressure swing adsorption gas separation device, and is compressed and pressurized; and the waste gas returns back to be mixed with fresh raw gas and the mixed gas is used as raw gas of the pressure swing adsorption gas separation device. The method is applicable to a product mainly composed of adsorption phase components and the pressure swing adsorption gas separation device with a displacement operation step. According to the method which takes the displacement waste gas and the directly-discharged gas, which are pressurized and returned back to be mixed with the fresh raw gas, as the raw gas of the pressure swing adsorption gas separation device, other separation devices for separating and recycling the displacement waste gas and the directly-discharged gas do not need to be used, so that the recycling of the displacement waste gas and the directly-discharged gas is realized on one set of the pressure swing adsorption gas separation device. Compared with the prior art, the pressure swing adsorption gas separation method has a simple flow, low investment, low energy consumption and convenience for operation; and the waste gas can be recycled and the directly-discharged gas also can be recycled, and the high recycling rate of the adsorption phase product components in the fresh raw gas can be effectively guaranteed.
Description
technical field [0001] The invention relates to a pressure swing adsorption gas separation method for recovering and replacing waste gas and degassing, in particular to a pressure swing adsorption gas separation method in which the main component of the product is an adsorption phase component, and belongs to the field of gas separation and purification. Background technique [0002] Pressure swing adsorption is a method to realize gas separation by using the different characteristics of solid adsorbents in the adsorption capacity of different gas components. The substance adsorbed on the surface of the solid adsorbent is the adsorbed phase. The pressure swing adsorption gas separation device performs adsorption under a certain pressure, and achieves the purpose of desorption of the adsorption phase and regeneration of the adsorbent by reducing the partial pressure of the gas components of the adsorption phase by reducing pressure, vacuuming, and flushing. In the adsorption...
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