Methanation process for effectively recovering low-grade waste heat

A methanation, low-grade technology, applied in the field of methanation process, can solve the problems of ineffective recycling, low waste heat recovery rate of methanation unit, and small amount of by-product steam, etc. The effect of comprehensive energy efficiency

Pending Publication Date: 2017-12-01
WISON ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of heat transfer temperature difference, a large part of these low-temperature waste heat cannot be effectively recycled, resulting in a low waste heat recovery rate of the methanation unit and a small amount of by-product steam

Method used

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  • Methanation process for effectively recovering low-grade waste heat
  • Methanation process for effectively recovering low-grade waste heat
  • Methanation process for effectively recovering low-grade waste heat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Taking the four-stage methanation reaction as an example, the annual production scale is 1 billion Nm 3 SNG, a new methanation process that effectively recovers low-grade waste heat is given. The process flow is as follows figure 2 As shown, the process includes the following steps:

[0033] The flow rate of raw synthesis gas 1 is 483470Nm 3 / h, temperature 30°C, pressure 3.3MPaG, composition (mol%): H 2 : 38.81, CO: 11.84, CO 2 : 35.26, H 2 O: 0.13, CH 4 : 13.78, N 2 : 0.11, Ar: 0.07, H 2 S: 0.1ppmv, after being preheated by the preheater 2, the preheated raw material gas 3 is obtained, and then enters the fine desulfurization reactor 4 to undergo a desulfurization chemical reaction to remove H 2 S and other sulfur-containing components to obtain desulfurized gas 5.

[0034]The obtained desulfurized gas 5 is mixed with the water in the water pipeline 35 to form the raw material gas 38 after water injection, enters the evaporator 6a for evaporation and gasifica...

Embodiment 2

[0041] Taking the four-stage methanation reaction as an example, the annual production scale is 1 billion Nm 3 SNG, a new methanation process that effectively recovers low-grade waste heat is given. The process flow is as follows image 3 As shown, the process includes the following steps:

[0042] The flow rate of raw synthesis gas 1 is 767077Nm 3 / h, temperature 30°C, pressure 3.3MPaG, composition (mol%): H 2 : 47.21, CO: 15.03, CO 2 : 36.61, H 2 O: 0.13, CH 4 : 0.63, N 2 : 0.28, Ar: 0.11, H 2 S: 0.1ppmv, after being preheated by the preheater 2, it enters the fine desulfurization reactor 4 to undergo a desulfurization chemical reaction to remove H 2 S and other sulfur-containing components to obtain desulfurized gas 5.

[0043] The obtained desulfurized gas 5 is mixed with the water in the water pipeline 35 to form a water-injected raw material gas 38 , which enters the evaporation superheater 6 for evaporation, gasification and superheating to obtain a superheated ...

Embodiment 3

[0051] The flow rate, temperature, and composition of the raw material synthesis gas in this embodiment are the same as those in Example 1. The difference is that the pressure of the raw material synthesis gas in this embodiment is 6.0 MPaG. Taking the three-stage methanation reaction as an example, the operating temperature of the first separation tank 24 is The operating temperature of the fine desulfurization reactor 4 is 250°C, and the inlet temperature of the third-stage methanation reactor is 150°C.

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Abstract

The invention relates to a methanation process for effectively recovering low-grade waste heat. The methanation process is characterized in that by a mode of filling water into raw synthesis gas, the gasifying-balance partial pressure and the gasifying temperature of water are reduced; and an evaporator and a superheater are arranged on an outlet pipeline of a final-stage methanation reactor, and the filled water is gasified till to be superheated by utilizing low-grade waste heat at an outlet of the final-stage methanation reactor. The methanation process has the advantages that on one hand, the recovery utilization rate of the final-stage low-level waste heat of the methanation reaction is increased, the yield of side-product steam is increased and the comprehensive energy efficiency of the methanation process is improved; on the other hand, according to the water filling amount, the heat release of the methanation reaction can be effectively controlled, the use of a high-temperature circulating gas compressor is avoided, the methanation reaction is easy to control and the safety of operation is improved.

Description

technical field [0001] The invention relates to the technical field of synthetic natural gas, in particular to a methanation process for effectively recovering low-grade waste heat. Background technique [0002] Natural gas is a clean energy with safe use and high calorific value. It is widely used in power generation, chemical industry, city gas, automobile fuel and other industries. It is one of the main clean energy sources in the world. Syngas methanation reaction is CO and H 2 , CO 2 with H 2 A strongly exothermic reaction that occurs under certain conditions of temperature, pressure and the presence of a catalyst. Typically, every 1 percent of CO methanation produces an adiabatic temperature rise of 74 °C; every 1 percent of CO 2 Methanation can produce an adiabatic temperature rise of 60°C. Therefore, how to effectively control the heat release of the methanation reaction and prevent the high temperature from burning out the catalyst and damaging the reactor is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
CPCC10L3/08
Inventor 宫万福闫兵海吕建宁侯宁圭多.科洛迪
Owner WISON ENG
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