Novel methanation reaction process for preparing synthetic natural gas
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A methanation reactor and methanation technology, which is applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of reactor temperature rise, large heat release of methanation reaction, and cannot be removed quickly, so as to achieve energy utilization rate High heat utilization efficiency and reduced heat loss
Active Publication Date: 2015-05-20
CHINA NAT OFFSHORE OIL CORP +2
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[0015] The second technical problem to be solved in the present invention is to solve the large heat release of methanation reaction, CO+CO 2 Excessively high levels of components can cause excessive reactor temperature rise and cannot be removed quickly
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Embodiment 1
[0042] In this example, the methanation process of producing liquefied natural gas by using coal-to-gas is as follows: image 3 Shown:
[0043] see image 3 , First, the raw material gas is purified to remove benzene, naphthalene, oxygen and desulfurization. The composition of purified coal gas (vol% is dry basis, the same below) is: H 2 : 64.21,CH 4 : 14.30, CO: 20.13, CO 2 : 0.89,N 2 : 0.47. The gas volume after purification is 2000Nm 3 / h, as methanation raw material gas.
[0044] Under the condition of 3.6MPa(G) and 300℃, the raw material gas is divided into three streams and enters the first adiabatic reactor 1, the second adiabatic reactor and the third adiabatic reactor respectively according to the volume ratio of 24:33:43, and the circulating gas is used The compressor takes part of the off-gas to the inlet of the first adiabatic reactor. The ratio of recycle gas to fresh gas entering the first adiabatic reactor is adjusted according to the outlet temperature...
Embodiment 2
[0050] In this example, the methanation process of producing liquefied natural gas by using coal-to-gas is as follows: Figure 4 Shown:
[0051] see Figure 4 , First, the raw material gas is purified to remove benzene, naphthalene, oxygen and desulfurization. The composition of purified coal gas (vol% is dry basis, the same below) is: H 2 : 64.21,CH 4 : 14.30, CO: 20.13, CO 2 : 0.89,N 2 : 0.47. The gas volume after purification is 2000Nm 3 / h, as methanation raw material gas.
[0052] Under the condition of raw material gas at 3.6MPa(G) and 300°C, the raw material gas is divided into two streams with a volume ratio of 50:50 and enters the first adiabatic reactor and the second adiabatic reactor respectively, and the circulating gas compressor is used to Part of the outlet gas is carried to the inlet of the first adiabatic reactor. The ratio of recycle gas to fresh gas entering the first adiabatic reactor is adjusted according to the outlet temperature to be controlle...
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Abstract
The invention belongs to the technical field of chemical engineering, relates to a process operation for preparing synthetic natural gas by taking coal or biomass as a raw material through isothermal reactors in the technical field of chemical engineering, and in particular relates to a novel methanation reaction process for preparing synthetic natural gas from a raw material obtained by preparing coal into gas. The process comprises the following steps: purifying the synthetic gas; pretreating the synthetic gas; and performing methanation on the pretreated gas. In the methanation step, multistage methanation reactions are carried out by multistage methanation reactors, wherein not less than two adiabatic reactors are adopted during the first-stage methanation reaction so as to decrease the load of a single tower; isothermal methanation reactors are adopted during subsequent stages of methanation reactions; the isothermal methanation reactors are suitable for the methanation reactions greater than or equal to the second stage. The process is high in energy utilization rate; heat exchange units are reduced, so that the heat loss of the whole system is decreased. The heat energy utilization efficiency of the process provided by the invention is higher than that of an existing process. Thus, a phenomenon of carbon separation in the whole methanation process is avoided.
Description
technical field [0001] The invention belongs to the technical field of chemical industry, and relates to the process operation using an isothermal reactor in the chemical technical field of producing synthetic natural gas by using coal or biomass as raw materials, specifically, pressurizing raw coal to produce coal gas (hereinafter referred to as coal gas production). A new methanation reaction process for producing synthetic natural gas after purification as raw material. Background technique [0002] In recent years, natural gas has attracted much attention as a clean energy. At present, the global natural gas consumption has reached 2.32 trillion Nm3 per year, accounting for 24.3% of the world's total primary energy demand. At present, the continuous and rapid development momentum of China's economy is still continuing, but the energy power to protect the economy is extremely scarce. In the context of rising international oil prices, China's energy crisis has become eve...
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