The invention discloses a fluidized bed and fixed bed combined methanation method. The method comprises the steps that (1) a methanation feed gas is divided into two feed gases; one feed gas, water vapor and a recycle process gas from a fluidized bed methanation system enter the fluidized bed methanation system after being mixed to undergo methanation reaction under the action of a fluidized bed methanation catalyst; (2) a part of the outlet gas of the fluidized bed methanation system undergoes heat exchange, then is treated by a gas-liquid separator to separate condensed water and is mixed with the other feed gas; the gases enter a fixed bed methanation reaction system to undergo methanation reaction under the action of a fixed bed methanation catalyst; the other part of the outlet gas from the fluidized bed methanation system serves as the recycle process gas. Control of the temperature of the whole system is achieved by adding two system temperature control means, namely regulating the split ratio of the feed gases entering the two reactor systems and injecting the gas mixture of water vapor and the recycle process gas into the fluidized bed reaction system by an ejector.

Fluidized bed and fixed bed combined methanation method

The invention a method for producing synthetic natural gas or coproducing hydrogen using dry-method thermal desulfurization of a circulating fluidized bed. The method includes feeding crude syngas washed by water chilling to the dry-method desulfurization of the circulating fluidized bed to desulfurize into high-temperature desulfurized syngas and SO2-rich gas, feeding the high-temperature desulfurized syngas to desulfurize in the fine desulfurization process, feeding at least part of finely-desulfurized syngas to be subjected to sulfur non-tolerant conversion in the sulfur non-tolerant conversion process so as to obtain converted syngas, feeding NH3/HCN in the desorption converted syngas in the adsorption process to obtain impurity-removal converted syngas, feeding a part of the impurity-removal converted syngas into the methanation process to prepare methane syngas, and feeding the other part into the hydrogen making process to generate hydrogen gas. The invention further discloses a system implementing the method. Via effective reasonable configuration of dry-method thermal desulfurization of the circulating fluidized bed combined with the sulfur non-tolerant conversion, methanation and hydrogen making technology, reaction heat is sufficiently utilized, qualified SNG (synthetic natural gas) product or hydrogen products can be produced or co-produced.

Method and system for producing synthetic natural gas or coproducing hydrogen using dry-method thermal desulfurization of circulating fluidized bed

The invention discloses a process method of producing and synthesizing natural gas by gasifying garbage and solves the problem that there is no natural gas producing and synthesizing process based on the garbage gasification technology up to now. The process method includes the steps of garbage gasification, gas purification, and methanation. The garbage gasification step includes a garbage feeding and high-temperature gasification section, a coarse synthetic gas dust removal and heat recovery section, a coarse synthetic gas chilling and washing section, and a high-temperature slag chilling and slag removal section; the gas purification step includes a COS hydrolysis and normal pressure desulfurization section, an induced draft fan and gas holder storage section, a synthetic gas compression section, a CO shift conversion section and an acidic gas removal section; and the methanation step includes a methanation section and a natural purifying section. The method finally produces the qualified natural gas that satisfies requirement in national quality standard. The method is simple, has high energy utilization rate and good recovery effect, and is energy-saving, emission-reducing and environment-friendly.

Process method of producing and synthesizing natural gas by gasifying garbage

The invention provides a method for removing hydrogen sulfide by using riser self-circulation, and the method is suitable for treating all kinds of industrial gases containing the hydrogen sulfide with a concentration of 10 ppm-99%. The method comprises the following procedures: (1) when the hydrogen sulfide in airflow is removed by using a metal complex solution, a reaction riser is adopted, and by using material flow kinetic energy and a material flow density difference, full mixing and contacting of the treated airflow and the metal complex solution are realized, so that an oxidation desulfurization reaction is finished; (2) when the metal complex solution is subjected to oxidization and regeneration, a regeneration riser is adopted, and by using material flow kinetic energy and a material flow density difference, regenerated air and a metal complex solution to be generated are fully mixed, so that a reduction regeneration reaction is finished; and (3) a regenerated mixture enters a regeneration settler for separation, excess air is exhausted from the top of the regeneration settler, a regeneration metal complex solution cycles from the middle of the regeneration settler to the reaction riser, and a solid-sulfur-containing solution located at the lower part of the regeneration settler enters a filtration system, solid sulfur is obtained, and a solution filtered out from the filtration system returns to the reaction system.

Method for removing hydrogen sulfide by using riser self-circulation

The invention discloses a sulfur-tolerant shift and circulating fluidized bed hot desulfurization combination synthetic gas purifying method, and an apparatus and an application thereof. A sulfur-tolerant shift technology is combined with a circulating fluidized bed hot desulfurization technology to reasonably configure heat of a shift reaction and a circulating fluidized bed desulfurization system and remove sulfur-containing compounds, arsenic and compounds thereof, and light aromatic hydrocarbons from synthetic gas, a fixed bed adsorbent is adopted to remove ammonia and cyanide from the synthetic gas, and a protection bed device is optionally increased to remove tiny amounts of other impurities, such as mercury and hydrogen chloride from the deprivation in order to realize synthetic gas purification. The sulfur-tolerant shift and circulating fluidized bed hot desulfurization combination synthetic gas purifying method can simplify the purifying process and reduce devices, so the occupied area of the devices is effective saved, and the investment cost of the synthetic gas purifying apparatus is reduced.

Sulfur-tolerant shift and circulating fluidized bed hot desulfurization combination synthetic gas purifying method, and apparatus and application thereof

The utility model discloses a combine resistant sulphur transform and desulfurated synthetic gas purifier of circulating fluidized bed hot method, it combines circulating fluidized bed desulfurization technique through the converter technique of nai sulphur, appropriate allocation transformationreation and circulating fluidized bed desulfurization system's heat, sulfur containing compound in the desorption synthetic gas, arsenic and compound, selenium and compound, the light aromatics, through ammonia and the cyanide in the fixed bed adsorbent desorption synthetic gas, and other microimpurities of synthetic gas are detached like mercury to optional the protection bed device that increases, hydrogen chloride, realize the target of synthetic gas purification. The purification flow can be simplified, reduction equipment to the technology that adopts the converter technique of nai sulphur to combine circulating fluidized bed desulfurization technique desorption purified gas to effective equipment area of saving and the investment cost who reduces synthetic gas purifier.

Combine resistant sulphur transform and desulfurated synthetic gas purifier of circulating fluidized bed hot method

The utility model discloses a system for hot desulfurization of circulating fluidized bed dry process production synthetic natural gas or coproduction hydrogen manufacturing uses coordinately, it includes that quench washing device, circulating fluidized bed hot method desulphurization unit, smart desulfurization protection bed device, the non - converting means of nai sulphur, adsorption bed take off NH3HCN device and SNG product gas apparatus for producing to can increase by a hydrogen plant. The utility model discloses a hot desulfurization of circulating fluidized bed dry process combines effective appropriate allocation of the resistant sulphur transform of non - and methanation, hydrogen manufacturing technique, make full use of the heat of above -mentioned reaction, produce the qualified hydrogen product of qualified SNG product or coproduction production.

System for hot desulfurization of circulating fluidized bed dry process production synthetic natural gas or coproduction hydrogen manufacturing uses coordinately

Zong Li

Papers

Method and system for producing synthetic natural gas or coproducing hydrogen using dry-method thermal desulfurization of circulating fluidized bed

Combine resistant sulphur transform and desulfurated synthetic gas purifier of circulating fluidized bed hot method

Sulfur-tolerant shift and circulating fluidized bed hot desulfurization combination synthetic gas purifying method, and apparatus and application thereof

System for hot desulfurization of circulating fluidized bed dry process production synthetic natural gas or coproduction hydrogen manufacturing uses coordinately