CN218012023U - Carbon neutralization carbon emission reduction recycling treatment system - Google Patents

Abstract

The utility model provides a carbon neutralization carbon emission reduction retrieves resourceful processing system, including the alkali lye scrubbing tower, bag collector, rotatory absorption tower, a compressor, condenser and ammonium carbonate synthetic tower, the alkali lye scrubbing tower is used for washing with alkaline suction fan inspiratory carbon dioxide waste gas, bag collector removes dust to the waste gas after the alkali is washed, the waste gas after the dust removal finishes gets into inside the rotatory absorption tower, the carbon dioxide of rotatory absorption tower in to waste gas absorbs, waste liquid after the absorption condenses through the condenser, unabsorbed waste gas gets into inside the compressor through the condenser, waste gas after the compressor compression gets into inside the ammonium carbonate synthetic tower, will send into centrifuge through the ammonium bicarbonate solid suspension that the ammonium carbonate synthetic tower generated and separate, the ammonium bicarbonate solid after the separation is collected after the desiccator is dried, the utility model discloses carbon dioxide waste gas to industrial flue gas carries out the entrapment and recycles, reaches the reuse of carbon dioxide resource.

Description

Carbon neutralization carbon emission reduction recycling treatment system

Technical Field

The utility model relates to a carbon neutralization emission reduction technical field especially relates to a carbon neutralization carbon emission reduction recycling treatment system.

Background

The measurement and calculation of the special committee on climate change (IPCC), if the 2 ℃ temperature control target of Paris protocol is realized, the global carbon dioxide net zero emission (also called carbon neutralization) must be achieved in 2050, namely the annual carbon dioxide emission is equal to the offset of emission reduction by means of tree planting and the like; in 2067, the net zero emission of greenhouse gases (also called as greenhouse gas neutralization or climate neutrality) is achieved, namely, the emission amount and the offset amount of greenhouse gases such as methane and the like except carbon dioxide are balanced.

The carbon neutralization target is put forward in China, the responsibility of China on environmental protection and coping with climate change problems is reflected, and a great blueprint is also produced for green and low-carbon development of China. Compared with the world major carbon emission countries, the goal of realizing 'carbon neutralization' in 2060 years in China can be said to be: the method has the advantages that the pressure is high, the task is heavy, the time is tight, if the carbon emission reduction is promoted according to the scheduled places before, the method is far from enough, and the method needs to be realized by adopting stronger measures in the future with greater resolution and soul.

By 2025, an economic system developed in a green low-carbon cycle is formed initially, and the energy utilization efficiency of key industries is greatly improved. The total energy consumption of unit domestic production is reduced by 13.5 percent compared with 2020; the total carbon dioxide emission rate of unit domestic production is reduced by 18% in 2020; the consumption proportion of non-fossil energy reaches about 20 percent; the forest coverage rate reaches 24.1 percent, the forest accumulation amount reaches 180 billion cubic meters, and a solid foundation is laid for realizing carbon peak reaching and carbon neutralization.

By 2030, the economic society develops comprehensive green transformation and obtains remarkable effect, and the energy utilization efficiency of the key energy consumption industry reaches the international advanced level. The total energy consumption of the unit domestic production is greatly reduced; the total carbon dioxide emission rate of the unit domestic production is reduced by more than 65% in 2005; the consumption proportion of non-fossil energy reaches about 25 percent, and the total installed capacity of wind power generation and solar power generation reaches more than 12 hundred million kilowatts; the forest coverage rate reaches about 25 percent, the forest accumulation amount reaches 190 billion cubic meters, the carbon dioxide emission reaches the peak value, and steady decline is realized.

In 2060 years, an economic system with green low-carbon circular development and a clean, low-carbon, safe and efficient energy system are comprehensively established, the energy utilization efficiency reaches the international advanced level, the consumption proportion of non-fossil energy reaches more than 80%, the carbon neutralization target is smoothly realized, the ecological civilization construction obtains abundant results, and a new harmonious and symbiotic human and nature is created.

At present, the two-carbon treatment technology at home and abroad mainly comprises:

1. solvent absorption techniques;

the solvent is used for absorbing and resolving the carbon dioxide, and the concentration of the carbon dioxide can reach more than 98 percent. The method is only suitable for recovering carbon dioxide from low-concentration carbon dioxide waste gas, and has complex flow and high operation cost.

2. Pressure swing adsorption technology;

the carbon dioxide in the mixed gas is adsorbed by adopting a solid adsorbent, and the concentration can reach more than 60%. The method is only suitable for removing carbon dioxide from the transformed gas of a fertilizer plant, and the concentration of the carbon dioxide is too low to be used as a product.

3. Organic membrane separation techniques;

the hollow fiber membrane is used for separating carbon dioxide under high pressure, and is only suitable for occasions with clean gas sources and the required carbon dioxide concentration of not higher than 90 percent.

4. Catalytic combustion technology;

combustible impurities in the carbon dioxide are converted to carbon dioxide and water using a catalyst and pure oxygen. The method can only remove combustible impurities, has high energy consumption and cost, and is eliminated.

5. Low temperature distillation technology;

the method is suitable for occasions with the concentration of carbon dioxide in a gas source of more than 90 percent, high requirement on product purity, huge equipment, higher energy consumption and the need of liquefaction, storage and transportation.

6. Carbon dioxide geological sequestration technology;

the saline aquifer is a well-known ideal place for burying carbon dioxide on a large scale in the future, but the current geological carbon dioxide sequestration technology is lack of reliability and long-term property, and once the carbon dioxide is leaked, the influence on the surrounding ecological environment can be caused.

7. The low-carbon emission technology of fossil energy plus CCUS is adopted;

at present, the low-carbon emission technology is still in a laboratory stage, and the overall development process of the CCUS in the whole world is relatively slow due to high investment cost, difference of policy support and the like.

8. Direct carbon capture in air technology;

carbon capture directly from air, rather than from plant chimneys, is referred to as "direct air capture". The technology has the advantages of large occupied area of carbon emission treatment facilities, high investment cost, less carbon element content in the air due to direct carbon capture from the air, low equipment treatment efficiency and long treatment period.

Therefore the utility model provides a carbon neutralization carbon emission reduction recovery resourceful treatment system.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a not enough to prior art existence, the utility model aims at providing a carbon neutralization carbon emission reduction retrieves resourceful treatment system, the utility model discloses a carbon dioxide that discharges away in the production process of mill carries out the entrapment to the carbon dioxide waste gas of industrial flue gas and recycles through constructing high-efficient combined treatment system, reaches the purpose of the repeated reuse of carbon dioxide resource and energy saving and emission reduction, reaches the peak for accelerating the realization global carbon neutralization, carbon and provides powerful technical support.

In order to achieve the above purpose, the present invention is realized by the following technical solution: the utility model provides a carbon neutralization carbon emission reduction retrieves resourceful processing system, includes alkali lye scrubbing tower, bag collector, rotatory absorption tower, compressor, condenser and ammonium carbonate synthetic tower, the alkali lye scrubbing tower is used for carrying out the alkali wash to the inspiratory carbon dioxide waste gas of suction fan, the bag collector removes dust to the waste gas after the alkali wash, and the waste gas after the dust removal finishes gets into inside the rotatory absorption tower, and the carbon dioxide of rotatory absorption tower in to the waste gas absorbs, and the waste liquid after the absorption passes through the condenser and condenses, and the waste gas that does not absorb passes through inside the condenser gets into the compressor, and the waste gas after the compressor compression gets into inside the ammonium carbonate synthetic tower, will send into centrifuge through the ammonium bicarbonate solid suspension that the ammonium carbonate synthetic tower generated and separate, and the ammonium bicarbonate solid after the separation is collected after the desiccator is dried.

Further, the tail end of the compressor is respectively connected with the rotary absorption tower and the top of the ammonium carbonate synthetic tower.

Furthermore, the top of the rotary absorption tower is connected with a discharge chimney, and the ammonium carbonate synthetic tower is connected with a liquid ammonia storage tank.

The utility model has the advantages that:

1. the utility model discloses can make full use of the air with carbon dioxide as the raw materials, realize carbon dioxide ground emission reduction and resource ground and recycle.

2. The traditional gas-liquid countercurrent contact tower adopts a rotary absorption tower to replace a rotary packed bed due to low flooding point and small effective contact area in unit volume, so that the heat transfer and reaction processes are greatly enhanced.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic structural view of the carbon neutralization carbon emission reduction recycling treatment system of the present invention.

In the figure: 1. a suction fan; 2. an alkali liquor washing tower; 3. a bag type dust collector; 4. rotating the absorption tower; 5. discharging a chimney; 6. a centrifuge; 7. a dryer; 8. a cooling tower; 9. an ammonium carbonate synthesis tower; 10. a compressor; 11. a liquid ammonia storage tank; 12. storing the condensate in a tank; 13. a condenser.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

The utility model discloses in, please refer to and show fig. 1, a resource processing system is retrieved in carbon and carbon emission reduction, including alkali lye scrubbing tower 2, bag collector 3, rotatory absorption tower 4, compressor 10, condenser 13 and ammonium carbonate converter 9, alkali lye scrubbing tower 2 is used for carrying out the alkali wash to suction fan 1 inspiratory carbon dioxide waste gas, bag collector 3 removes dust to the waste gas after the alkali wash, the waste gas after the dust removal finishes gets into inside rotatory absorption tower 4, rotatory absorption tower 4 absorbs the carbon dioxide in the waste gas, the waste liquid after the absorption carries out the condensation through condenser 13, unabsorbed waste gas passes through condenser 13 and gets into inside compressor 10, waste gas after compressor 10 compression gets into inside ammonium carbonate converter 9, will send into centrifuge 6 through the ammonium bicarbonate solid suspension that converter 9 generated and separate, the ammonium bicarbonate solid after the separation is collected after 7 drying through the desiccator.

The tail end of the compressor 10 is respectively connected with the tops of the rotary absorption tower 4 and the ammonium carbonate synthetic tower 9, purge tail gas supplemented by the rotary absorption tower 4 is mixed at the outlet of the compressor 10, carbon dioxide waste gas passing through the top of the ammonium carbonate synthetic tower 9 is compressed to tail gas circulating compressor 10 through a tail gas water separator to be recycled to 0.5-0.9 MPa, and is mixed with the tail gas, the top of the rotary absorption tower 4 is connected with a discharge chimney 5, the discharge chimney 5 discharges the treated gas, the ammonium carbonate synthetic tower 9 is connected with a liquid ammonia storage tank 11, and liquid ammonia is supplied through the liquid ammonia storage tank 11.

The utility model discloses in, a carbon neutralization carbon emission reduction recovery resourceful treatment method, the method includes following step:

step S1: carrying out alkaline washing on the recovered carbon dioxide waste gas through an alkaline washing tower 2, and enabling the waste gas after the alkaline washing to enter a bag type dust collector 3 for dust removal;

when the alkali washing tower 2 is used for carrying out alkali washing on the carbon dioxide waste gas, the method specifically comprises the following steps:

step 1: the carbon dioxide waste gas enters the alkali liquor washing tower 2, the airflow generates rotation and centrifugal motion when passing through the blades, and the absorption liquid is uniformly distributed to each blade through the middle blind plate to form a thin liquid layer;

and 2, step: the blades and the airflow rotating upwards form rotating and centrifuging effects, are sprayed into fine liquid drops and are thrown to the tower wall;

and step 3: the absorption liquid enters from the upper part of the tower and exits from the lower part of the tower, the air flow and the absorption liquid do relative motion in the tower, and a water film with a large surface area is formed at the structural part of the rotational flow tower plate, thereby greatly improving the absorption effect.

And 4, step 4: the absorption liquid of each layer falls into a collection tank at the edge under the action of rotational flow centrifugation, and then enters a next layer of tower plate through a flow guide pipe for absorption of the next layer.

The main mechanism is inertial collision of dust particles and liquid drops, centrifugal separation, liquid film adhesion and the like, the tower plate allows high-speed airflow to pass due to large aperture ratio, so the tower plate has high load, high treatment capacity, low pressure drop, large operation elasticity and short gas-liquid contact time, and is suitable for gas phase diffusion control processes, such as gas-liquid direct contact heat transfer, rapid reaction absorption and the like, a pretreatment absorbent adopts sodium hydroxide, and the characteristic of alkaline solution is utilized to neutralize gas containing acidic impurities in combustion waste gas.

The waste gas washed by the alkali liquor enters the bag type dust collector 3 equipment, the carbon dioxide waste gas enters the dust hopper from the air inlet, a part of coarse dust particles fall into the dust hopper due to the rapid expansion of the gas volume or the reasons of inertia or natural sedimentation, the rest most dust particles rise along with the air flow and enter the bag chamber, the dust particles are retained outside the filter bag after being filtered by the dust removal filter bag, the purified gas enters the upper box body from the inside of the filter bag and then is discharged into the atmosphere through the valve plate hole and the air outlet, and therefore the purpose of dust removal is achieved.

Step S2: absorbing the carbon dioxide waste gas after dust removal through the rotary absorption tower 4, condensing waste liquid formed after the carbon dioxide is absorbed and discarded through a condenser 13, storing the waste liquid through a condensate storage tank 12, and enabling the carbon dioxide waste gas which is not absorbed to enter the compressor 10;

the rotary absorption tower 4 performs the carbon dioxide waste gas absorption process as follows:

step 21: the carbon dioxide-containing waste gas after dust removal is fully mixed in a buffer bottle and then enters the rotary absorption tower 4, and enters a filler layer filled with the organic polymer sieve through an even air distribution plate under the action of pressure;

step 22: spraying the inner edge of the packing layer in the inner cavity of a rotating shaft in the rotary absorption tower 4 along with the rotation of the rotating shaft, pushing the inner edge of the packing layer to the outer edge of the packing under the action of centrifugal force, and dispersing and crushing the liquid into liquid drops with continuously updated surface areas by the packing in the pushing process;

step 23: liquid is thrown to the shell by the rotating shaft, collected and leaves the rotating packed bed through the liquid outlet pipe, the concentration of carbon dioxide waste gas discharged from the top of the tower is measured by a chemical absorption method, and the treatment efficiency of the rotating absorption device is calculated according to the concentration of the front carbon dioxide waste gas and the concentration of the rear carbon dioxide waste gas;

step 24: the packing layer of the organic polymer sieve is divided into absorption, regeneration and cooling areas by external equipment, the cylindrical honeycomb absorbent inside the rotary absorption tower 4 rotates at a rotation speed of 2-3 r/min, and water vapor in a temperature range of 150-180 ℃ is supplied to the regeneration area, so that the separation reaction of carbon dioxide absorbed in the corrugated absorbent is carried out, and high-concentration concentrated carbon dioxide can be obtained.

The above-mentioned absorption-regeneration-cooling step is configured by cooling the high-temperature corrugated absorbent, which has rotated from the regeneration region and moved to the cooling region, with air at a temperature of less than 50 ℃ to a condition favorable for the absorption reaction, thereby achieving both adsorption removal and regeneration concentration of carbon dioxide in one cylindrical absorbent.

Carbon dioxide waste gas from the rotary absorption tower 4 passes through the raw gas-water separator to the inlet of a C02 compressor 10, is compressed to 0.7MPa by the compressor 10, is mixed with the supplementary purge tail gas from the rotary absorption tower 4 at the outlet of the compressor 10, and is mixed with the carbon dioxide waste gas from the top of the ammonium carbonate synthesis tower 9, which passes through the tail gas-water separator, to the tail gas circulating compressor 10, and is compressed to 0.7MPa to be recycled to form mixed gas.

Selection of carbon dioxide absorbents

The carbon dioxide separation technology depends on the state characteristics of the concentration, pressure, flow and the like of carbon dioxide to be captured (aiming at the characteristics of low concentration, low partial pressure, high content of impurities and oxygen in combustion flue gas, most of the carbon dioxide in the flue gas adopts an amine solution method, and an MEA (monoethanolamine) and DEA (diethanolamine) solution method has the defects of easy degradation of a solvent, strong corrosivity, large regeneration energy consumption and the like although the technology is mature, and a TEA (triethanolamine) and MDEA (N-methyldiethanolamine) solution method has single selectivity, good stability, small regeneration heat and basically no corrosion to equipment, but has a small absorption rate, and in order to accelerate the absorption and regeneration rates, a mixed organic amine absorption method which takes single-component organic amine as a main solvent and adds a small amount of activating components capable of performing strong chemical reaction with the carbon dioxide is adopted.

The absorption mechanism of the organic amine solution is as follows:

the absorption of carbon dioxide by an organic amine solution mainly depends on nitrogen atoms contained in amine molecules, amine is dissociated in an aqueous solution, so that the solution becomes alkaline and is easy to react with gases such as carbon dioxide, and the aim of removing the carbon dioxide is achieved; as The Enamine (TETA) content of the solution decreases, the amount dissolved increases, and the absorption rate decreases; it shows the characteristic of physical absorption of alcohol amine (MDEA).

It should be noted that, after the concentrated ammonia water in the ammonium carbonate synthesis tower 9 absorbs the carbon dioxide waste gas, 5% to 40% of the gas containing the carbon dioxide waste gas enters the bottom of the ammonium carbonate synthesis tower 9, the concentrated ammonia water in the carbonization secondary tower section of the ammonium carbonate synthesis tower 9 absorbs the carbon dioxide waste gas respectively to make the carbon dioxide waste content in the tail gas less than 0.4%, the gas enters the upper recovery cleaning section of the ammonium carbonate synthesis tower 9, and after the carbon dioxide is absorbed and the NH is cleaned by the desalted water in the cleaning section, the carbon dioxide content is less than 0.4% (Vol%) and the NH3 content is less than 0.07% (Vol%), and the tail gas with the pressure of 0.5MPa is compressed to 0.7MPa by the tail gas water separator to prepare a mixed gas, and then the mixed gas enters the carbonization process for recycling.

And step S3: compressor 10 compresses carbon dioxide waste gas, and the waste gas after compressing mixes with supplementary purge tail gas at compressor 10 exit earlier, mixes with the tail gas that comes from ammonium carbonate converter 9 again together, gets into the carbonization process, and the waste gas after will mixing is imported inside ammonium carbonate converter 9.

The carbonization process specifically comprises the following steps:

the prepared mixed gas enters the bottoms of the main towers of the double series of parallel carbonization towers;

adding a carbonization liquid from a carbonization pump at the upper part of a main tower of the carbonization tower, and carrying out countercurrent bubbling contact with the mixed gas to absorb carbon dioxide in the carbonization liquid, wherein 60-95% of carbon dioxide waste gas is absorbed to generate ammonium bicarbonate crystals, and 5-40% of carbon dioxide waste gas enters a carbonization auxiliary tower from the top of the main tower of the carbonization tower; the type of the carbonization pump is as follows: 02P0201abc, the carbonization liquid is a pre-carbonization liquid which comes from a carbonization sub-tower and is pre-carbonized.

Retrieve washing section upper portion at the carbonization tower main tower, add and get into through the soft water that soft water cooler cools off to 20 ℃ and retrieve washing tower upper portion, get into the absorption through the sieve at retrieving the washing section, NH and C02 among the recovery gas, it is qualified to guarantee the tail gas, the carbonization main tower produces the ammonium bicarbonate crystallization after absorbing, suspension is delivered to back workshop section, a small amount of crystallization adhesion is on tower wall and cooling water tank, influence the water tank heat transfer, change carbonization tower main tower and carbonization auxiliary tower 1 time per 1-2 in production, the carbonization tower main tower that will have the crystallization is changed and is changed into and change the auxiliary tower, including the bubbling of dense ammonia water washs and dissolves crystalline carbon, the water cooler model: 02E0201.

Wherein the main tower and the auxiliary tower of the carbonization tower jointly form an ammonium carbonate synthetic tower 9.

And step S4: ammonium carbonate synthetic tower 9 absorbs carbon dioxide waste gas and generates ammonium bicarbonate solid suspension, cools ammonium bicarbonate solid suspension through cooling tower 8, sends cooled ammonium bicarbonate solid suspension into centrifuge 6 for separation, and dries the ammonium bicarbonate solid of reposition of redundant personnel through desiccator 7.

Taking out the generated ammonium bicarbonate solid suspension containing crystals from the lower part of the ammonium carbonate synthesis tower 9, sending the suspension into a thickener, and flowing into a centrifuge 6 for separation to separate ammonium bicarbonate crystals from mother liquor to obtain a wet ammonium bicarbonate finished product;

one part of wet ammonium bicarbonate is used as agricultural ammonium bicarbonate discouraged finished products and is sent to a finished product warehouse after being weighed and packaged by a belt, the other part of wet ammonium bicarbonate is sent to a hot air drying pipe by a screw conveyor, hot air coming from an air blower and preheated by an air heater is introduced into the bottom of the hot air drying pipe, the dried ammonium bicarbonate is sent to a cyclone separator for further separation by air flow conveying, food-grade ammonium bicarbonate finished products are obtained, and the food ammonium bicarbonate finished products are sent to the finished product warehouse after being weighed and packaged by the belt.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still make modifications or changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some technical features, within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (3)

1. The utility model provides a resource processing system is retrieved in carbon and carbon emission reduction, its characterized in that, including alkali lye scrubbing tower, bag collector, rotatory absorption tower, compressor, condenser and ammonium carbonate synthetic tower, the alkali lye scrubbing tower is used for carrying out the alkali wash to the inspiratory carbon dioxide waste gas of suction fan, the bag collector removes dust to the waste gas after the alkali wash, and the waste gas after the dust removal finishes gets into inside the rotatory absorption tower, and the rotatory absorption tower absorbs the carbon dioxide in the waste gas, and the waste liquid after the absorption passes through the condenser and condenses, and the waste gas after the absorption passes through inside the condenser gets into the compressor, and the waste gas after the compressor compression gets into inside the ammonium carbonate synthetic tower, will send into centrifuge through the ammonium bicarbonate solid suspension that the synthetic tower generated and separate, and the ammonium bicarbonate solid after the separation is collected after the desiccator is dried.

2. The carbon neutralization, carbon emission reduction, recycling and resource treatment system according to claim 1, wherein the tail end of the compressor is connected with the top of the rotary absorption tower and the top of the ammonium carbonate synthesis tower respectively.

3. The system for carbon neutralization, carbon emission reduction, recycling and resource treatment according to claim 1, wherein a discharge chimney is connected to the top of the rotary absorption tower, and a liquid ammonia storage tank is connected to the ammonium carbonate synthesis tower.

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