Process method for deep capture of CO2 in exhaust gas of industrial furnace and isotope synergistic effect

Abstract

A kind of industrial furnace tail gas CO2 deep cut and isotope efficiency process method, including from the flue gas after pretreatment, heat exchange is carried out by heat exchanger, flue gas temperature drops to ≤40 ℃, flue gas is blown into flue gas low temperature dry method purifier by induced draft fan and is purified;In the state that flue gas temperature is ≤40 ℃, using new organic composite amine solution, by CO 2 Absorption tower high efficiency cut CO2, CO2 emission reduction 96% in flue gas.Finally enriched CO 2 By means of carbonization tank and ammonium chloride concentration crystallization tower, with CO 2 Gas as raw material, chemical reaction is carried out with industrial raw material magnesium chloride, water, ammonia in carbonization tank, then separation is obtained by centrifugal pump, and hydration magnesium carbonate and ammonium chloride widely used in industry and agriculture reach national standard, industry standard. Enterprise can obtain rich economic benefits, this is the industrial furnace flue gas CO 2 Deep emission reduction, efficiency can maintain the basis condition and vitality.

Description

Technical Field

[0001] This invention belongs to the field of CO2 emission reduction and treatment technology for industrial furnaces and kilns, and is particularly suitable for solving the problems of large investment and waste of CO2 resources in the emission reduction and treatment of tail gas from cement clinker kilns or dedicated lime kilns in large steel plants. Background Technology

[0002] With the acceleration of industrialization worldwide, CO2 emissions from industrial furnace exhaust are increasing, contributing to the devastating greenhouse effect and wasting precious carbon resources, now threatening the long-term stability of the environment for human survival. Therefore, controlling carbon dioxide emissions and implementing in-depth CO2 control measures in industrial furnace exhaust to achieve deep emission reduction and simultaneous efficiency improvement has become a major concern for countries worldwide. The flue gas from industrial furnaces, especially those using mineralized organic matter as primary fuel, can contain CO2 concentrations exceeding 25%. By employing new processes for deep purification and interception of CO2 in industrial furnace flue gas, and simultaneous efficiency improvement, not only can CO2 emissions be significantly reduced and the greenhouse effect eliminated, but simultaneous efficiency improvements and direct reuse can also be achieved, greatly enhancing the overall effectiveness of emission reduction for enterprises. This invention takes cement clinker kilns as an example, specifically proposing a technological innovation scheme for the treatment of large and medium-sized cement clinker kilns.

[0003] Currently, numerous large and medium-sized cement clinker kilns are key areas of environmental protection in various regions, and all are facing strategic transformation. Especially for the enterprises mentioned above, the exhaust gas from cement clinker kilns has long presented a challenge in controlling high-temperature, high-dust, and high-concentration pollution sources. Due to the complexity of treatment technologies and the high initial investment in process equipment, most enterprises have experienced pressure from environmental investment in environmental governance. Because of the diverse types of pollution sources, large emission volumes, complex treatment technologies, high investment, and low overall return on investment in exhaust gas, relying solely on investment from a single enterprise is difficult. Currently, the emission control standards for cement clinker kiln exhaust gas adopted by various countries worldwide employ a flexible management policy of transitional grading and phased compliance. Only emission and compliance standards are given for key pollution sources; such as NO... XRegarding CO2, a significant environmental pollutant, the aforementioned reasons have prevented the development of corresponding national standards for regulation. Currently, CO2 emissions have jeopardized the safety of the entire human environment. While national management agencies have been advocating emission reduction, they have not taken effective action, particularly in the cement industry's clinker kiln production systems. The concept of strategic environmental upgrades and dedicated equipment for simultaneous efficiency enhancement has been proposed long ago, and special engineering design demonstrations and subsidy policies have been promoted for many years. However, projects and promotion plans to ensure the industrialization of deep CO2 purification and simultaneous efficiency enhancement, along with related industrialization implementation phases, have yet to materialize. Experts are appealing for more inventors and entrepreneurs to dedicate their energy and resources to the early implementation and widespread application of this project, which is crucial for the long-term stability and security of all humanity. Summary of the Invention

[0004] This invention discloses a process for deep CO2 interception and in-situ efficiency enhancement in industrial furnace exhaust gas. The aim is to provide an environmentally friendly resource-based treatment solution for the valuable components, specifically CO2, in the exhaust gas of industrial furnaces using conventional fuels. This patent aims to achieve the dual benefits of environmental purification and increased enterprise profits, and to facilitate its application and further promotion.

[0005] The innovative design objective of this invention is very clear: a process method for deep purification, interception, and in-situ efficiency enhancement of CO2 in industrial furnace exhaust gas. This process method includes NO reduction for environmental compliance treatment of the flue gas emitted from industrial furnaces. X Cooling, dust removal, and further NO removal X The pretreatment process for compliant discharge of clinker kiln exhaust gas involves a sophisticated method that further purifies, retains, and simultaneously enhances the efficiency of CO2 removal from the pretreated exhaust gas. The steps are as follows: step The pre-treated exhaust gas, which has initially met the standards, is introduced into a dry purification and fine-control interception tower via a heat exchanger for further filtration and interception, achieving deep purification treatment. This reduces the temperature of the pre-treated exhaust gas to ≤40℃ and increases its CO2 content to 3-5%, laying the foundation for deep purification and CO2 resource conversion, and transforming it into raw materials for industrial production. This allows the calibration, deep purification, enrichment, and concentration processes to proceed steadily. step After deep purification, CO2 with a concentration of not less than 28% is sent into the CO2 enrichment system through the outlet of the dry purification and fine-control interception tower. Resource conversion and processing; CO2 enrichment system The system is equipped with a gas-liquid separator to form two streams: a novel organic compound amine solution stream and a CO2 gas stream with a concentration of 85-95%. It also utilizes specialized equipment such as an absorption tower and a regeneration tower to achieve the two tasks of CO2 concentration re-collection and resource concentration, and then leads out a CO2 enrichment system. step The novel organic composite amine solution flow P, cooled by an amine pump and heat exchanger (Z6), and the novel organic composite amine solution from the bottom of the regeneration tower are sprayed out from the top of the absorption tower by a sprinkler. This creates a convection current with the deeply purified tail gas introduced from the deep purification tail gas inlet at the bottom of the absorption tower, thus achieving a CO2 enrichment system. The CO2 is then recaptured; and then, with the aid of an amine pump, the temperature is significantly increased through a heat exchanger before being introduced into a regeneration tower to achieve CO2 reconcentration. Once the CO2 concentration in the CO2 gas stream f reaches the expected target designed in this application, it is then transported to the efficiency-enhancing production process system.

[0006] Further improvements primarily focus on the structural design of the dry purification and fine-control interception tower to achieve deep CO2 purification in the exhaust gas. The key lies in the aforementioned process steps. The specialized equipment used is a dry purification and fine-control interception tower. This tower has a cylindrical structure and contains five layers of three types of fluidized bed filters, arranged from top to bottom as follows: layers 1, 2, 3, and 4 are for catalytic cracking and NO removal. X The fifth bed is a microporous fine filter ball bed; each type of bed includes three structures: optimized activated carbon particles, adapted filter screen layer, and plate and frame support, to remove residual NO from the exhaust gas. X The process involves cracking and venting to achieve deep purification of CO2.

[0007] Further improve process steps The internal structural features of the dry purification and fine-control interception tower for specialized equipment are as follows: The top of the interception tower has a deep-purification CO2 outlet. Optimized activated carbon granules are installed between each type of filter layer. These granules enter the tower's 1st, 2nd, 3rd, and 4th beds via a vacuum pump from the hopper. Ammonia enters the tower through an ammonia-air mixing inlet. After passing through a heat exchanger, the exhaust gas reaches a temperature of ≤40℃ and is then drawn into the tower by an induced draft fan through the deep-purification exhaust gas inlet. It passes sequentially from bottom to top through the 5th, 4th, 3rd, 2nd, and 1st beds, with further dust removal occurring in the 5th bed.

[0008] The optimized activated carbon granules exhibit superior catalytic activity at temperatures ≤40℃, achieving an 85% NOx removal rate for exhaust gas passing through bed layers 4, 3, 2, and 1. Exhausted optimized activated carbon granules are discharged from the granule outlet and transported via a vacuum pump to the fuel bin, and then to the boiler for recycling.

[0009] Further improvements involve extending and supplementing the process method of this application. The key lies in the steps of the aforementioned process method. The CO2 enrichment system The system comprises specialized equipment, including an absorption tower, a regeneration tower, and a servo mechanism gas-liquid separator. These specialized components are interconnected by CO2 transmission pipelines, heat exchangers, a dedicated amine pump, and a temperature sampling and testing mechanism, forming a CO2 enrichment system. This structure enables a highly efficient CO2 enrichment system that allows for repeated capture and continuous improvement of CO2 concentration and purity. .

[0010] The key to this application lies in the aforementioned steps. CO2 enrichment system The specialized equipment includes an absorption tower, a regeneration tower, and a servo mechanism gas-liquid separator. Both the absorption tower and the regeneration tower are cylindrical tower structures, and both towers are equipped with a CO2 solubilizing packing layer. A metal mesh demister is installed at the top of the absorption tower, and a matching gas outlet is provided. A stable process temperature range is set in the regeneration tower, and a regeneration tower insulation device is provided.

[0011] The above-mentioned process methods have been extended and continuously improved to increase the CO2 concentration. This involves the repeated capture and concentration of CO2 in the deeply purified exhaust gas, timely replenishment with the help of gas-liquid separators and organic compound amine solvents, and the control of process temperature and environmental process pressure.

[0012] The key innovation of this invention lies in the deep purification and mass capture and concentration of CO2, which involves further refinement and improvement of the process method of this invention.

[0013] The aforementioned process steps for deep CO2 interception and in-situ efficiency enhancement of industrial furnace tail gas In China, CO2 enrichment system The process temperature inside the specialized regeneration tower is 103-110℃, and the outer shell is equipped with a steam pipe insulation device; the process temperature inside the absorption tower is ≤40℃; a specialized new type of organic composite amine solution conveying pipeline is installed between the absorption tower and the regeneration tower, and a heat exchanger Z is installed in the pipeline. 3、 Z 4、 Z2, Z6 and process temperature sampling point T 2、 T3 utilizes a servo-mechanical gas-liquid separator and an amine pump in the delivery pipeline to achieve a CO2 enrichment system. The internal process parameters of the specialized equipment are adaptively adjusted.

[0014] The key design also lies in the process steps of this invention. The overall structure of the CO2 enrichment system described herein has been improved. Specialized equipment includes an absorption tower, a regeneration tower, and a servo-mechanism gas-liquid separator, incorporating a novel organic composite amine solution transmission pipeline with a programmable flow switch and a heat exchanger Z. i A dedicated amine pump, along with a temperature sampling mechanism T, was also installed. i The CO2 enrichment system, composed of the above-mentioned structures, achieves the separation of deeply purified CO2 from the exhaust gas within the enrichment and concentration system, converting it from gaseous and liquid states into high-quality resource utilization. The purity of the deeply purified CO2 reaches 85-95%.

[0015] This invention employs a combination of optimized activated carbon particles to improve filtration efficiency and the reducing properties of ammonia in a deep-purification dry purification and fine-control interception tower, thereby enabling the cracking of NO... X The purification effect is remarkable. The CO2 concentration entering the absorption tower after deep purification can be further increased to 28%, and then further processed by the CO2 enrichment system. The process of capturing and concentrating CO2 to improve its purity gradually approaches the design specifications while simultaneously enhancing the level of purification. Based on this, the intercepted CO2 gains the value of resource conversion and isotopic synergistic utilization.

[0016] To further extend the invention towards the goal of synergistic effect, the steps described in the process method design of this invention... The special filter media used in the dry purification and fine control interception tower of the special equipment is microporous fine filter balls, which are more effective at adsorbing metal dust. The microporous fine filter balls are made of stainless steel without sintering process.

[0017] The steps of the aforementioned process for deep CO2 interception and in-situ efficiency enhancement in industrial furnace tail gas The amine pump used in this embodiment represents a specialized liquid delivery mechanism. It is a dedicated device that uses water as a carrier solvent and has the capacity to carry CO2. This device is connected in series with a novel organic composite amine tank, positioned in the middle of the delivery pipeline for the novel organic composite amine solution P. The organic composite amine tank contains a novel organic composite amine solution pool and a vaporization channel. The novel organic composite amine solution uses monoethanolamine as the main modifier, with a ≤30% (w / w) aqueous solution as the main component. The added additives and their (w / w) percentages are: corrosion inhibitor potassium vanadate 1.1%–6%, antioxidant V2O5 0.4%–1.2%, co-solvent tetraethylenepentamine 16%–22%, and other components being weakly alkaline water. Specific embodiments are detailed in the example list provided in the specific implementation method.

[0018] The CO2 retained after meeting the design requirements of this application is precisely proportioned, stirred, and mixed with industrial-grade magnesium chloride, ammonia, and weakly alkaline water to produce hydrated magnesium carbonate and ammonium chloride, which meet national product-grade standards. This allows enterprises to obtain substantial economic benefits while simultaneously reducing CO2 emissions for air pollution control. This is precisely the vitality that enables the deep CO2 retention, emission reduction, and efficiency enhancement process for industrial furnace flue gas to continue to develop, which is the ultimate goal of this invention.

[0019] CO2 capture and concentration between the absorption tower and the regeneration tower are continuously carried out along with the deep purification, capture, and concentration of the exhaust gas. The amine pump effectively replenishes the losses of the novel organic compound amine solution. Repeated capture and concentration of CO2 continuously increases the online concentration. The novel organic compound amine solution, having absorbed CO2 in the absorption tower, is transported to the regeneration tower where it is heated and decomposes, releasing more CO2. This CO2, along with water vapor and the novel organic compound amine solution, is discharged from the top pipeline of the regeneration tower. After multi-stage cooling, a dedicated gas-liquid separator separates the CO2 gas and novel organic compound amine solution into upper and lower streams, with a small amount of the novel organic compound amine solution also lost; this is replenished by the amine pump in subsequent process steps.

[0020] To achieve the objectives of this invention, this application further provides a simple yet efficient production process system. .

[0021] The aforementioned process for deep CO2 interception and in-situ efficiency enhancement in industrial furnace tail gas includes the following steps: The efficiency-enhancing production process system mentioned in the text The process structure design includes the main equipment carbonization tank and the auxiliary equipment ammonium chloride concentration and crystallization tower, and includes the following servo raw material conveying subsystems for the two production devices: Servo Subsystem 1: This is a dedicated liquid raw material conveying device for the carbonization tank of the main equipment; it includes pipelines for magnesium chloride and purified water raw materials, which are connected to the magnesium chloride solution preparation tank. The tank is equipped with a stirrer, and a liquid magnesium chloride passage is set at the bottom of the tank. The pipeline is connected to the carbonization tank, and together with CO2 and vaporized ammonia, it forms the raw material conveying servo subsystem 1 of the main equipment. Servo Subsystem 2: This is the raw material conveying channel of the ammonium chloride concentration crystallization tower. It consists of a storage tank, a booster pump, and the upper inlet of the ammonium chloride concentration crystallization tower, forming the first channel. The second channel passes through the storage tank, the booster pump, and the middle of the ammonium chloride concentration crystallization tower. The third channel returns from the intermediate storage tank to the top of the ammonium chloride concentration crystallization tower via a circulation pump. These three channels together constitute the concentration grading servo subsystem 2 of the ammonium chloride concentration crystallization tower.

[0022] The carbonization tank and auxiliary equipment, the ammonium chloride concentration and crystallization tower, form an efficiency-enhancing production process system. The main equipment in this process uses CO2 as the primary raw material, with industrial magnesium chloride, liquid ammonia, and purified water added in proportions according to the design principles of this invention. After mixing and stirring, two synergistic products, hydrated magnesium carbonate and ammonium chloride, are generated in the carbonization tank. The separation of the two synergistic products is achieved using a centrifugal pump in servo subsystem 1. A chemical reaction takes place in the carbonization tank of the production equipment to generate ammonium chloride, which has wide applications in industry and agriculture. hydrated magnesium carbonate Two independent products are formed by centrifugation and stepwise concentration.

[0023] The reaction equation is as follows: Attached Figure Description

[0025] Figure 1 Schematic diagram of CO2 deep emission reduction and in-situ efficiency enhancement process in industrial furnaces and kilns; Figure 2 Schematic diagram of the CO2 tail gas dry purification and fine control interception tower structure; Figure 3 Schematic diagram of a CO2 enrichment system after deep purification; Figure 4 Flowchart of the production process for hydrated magnesium carbonate and ammonium chloride.

[0026] Figure 1 middle: Steps for ensuring the exhaust gas from clinker kilns meets emission standards a) High-temperature denitrification, b) Waste heat power generation, c) Bag filter dust collection, d) Dedicated pyrolysis furnace calibration and purification; Deep purification system Z1 heat exchanger, 1-17 heat exchangers, 1-18 induced draft fan, 1 dry purification and fine control interception tower; CO2 enrichment system : 2-1-0 Absorption tower, 2-2-0 Regeneration tower, 2-2-4 Gas-liquid separator, 2-2-5 CO2 induced draft fan; Efficient production process system 3-0 Carbonization tank, 3-0-1 Magnesium chloride, 3-0-2 Water, 3-0-3 Liquid ammonia, 3-0-4 Centrifugal pump, 3-0-5 Hydrated magnesium carbonate dryer, 3-0-6 Hydrated magnesium carbonate product, 3-1 Ammonium chloride concentration crystallization tower, 3-1-3 Centrifugal pump, 3-1-4 Ammonium chloride dryer, 3-1-5 Ammonium chloride product.

[0027] Figure 2 middle: 1-0 Shell, 1-1a Optimized activated carbon granules, 1-2 Filter layer, 1-3 Plate and frame support, 1-4 Microporous fine filter ball, 1-5 Optimized activated carbon granule inlet, 1-6 Vacuum pump, 1-7 Hopper, 1-8 Ammonia and air mixing inlet, 1-9 Deep purification exhaust gas inlet, 1-12 Deep purification exhaust gas outlet, 1-11 Microporous fine filter ball inlet and outlet; 1-10 Optimized activated carbon granule outlet; 1-14 Vacuum pump ash unloading car; 1-15 Fuel bin; 1-16 Boiler.

[0028] Figure 3 middle: 2-1-0 Absorption tower, 2-1-1 CO2 solubilizer packing device, 2-1-2 Deep purification tail gas inlet, 2-1-3 Shower head, 2-1-4 Amine pump, Z2, Z3, Z4, Z5, Z6 heat exchangers, 2-2-0 Regeneration tower, 2-2-1 CO2 solubilizer packing device, 2-2-3 Insulation device, 2-2-4 Gas-liquid separator, 2-2-5 Exhaust fan, 2-2-6 Amine pump.

[0029] Figure 4 middle: 0-3-0 Magnesium chloride solution preparation tank, 0-3-1 stirrer, 3-0 carbonization tank, 3-0-9 stirrer, 3-0-1 magnesium chloride, 3-0-2 water, 3-0-3 gaseous ammonia, 3-0-4 centrifugal pump, 3-0-5 hydrated magnesium carbonate dryer, 3-0-6 hydrated magnesium carbonate product, 3-0-7 storage tank, 3-0-8 booster pump, 3-1 ammonium chloride concentration crystallization tower, 3-1-2 intermediate storage tank, 3-1-1 circulating pump, 3-1-3 centrifugal pump, 3-1-4 ammonium chloride dryer, 3-1-5 ammonium chloride product, 3-1-6 storage tank, 3-1-7 booster pump. Detailed Implementation

[0030] The following description, accompanying drawings, and examples of the novel composite amine solubilizer further illustrate how the purpose of this patent application is achieved step by step.

[0031] The following table shows examples of solubilizing and modifying agent formulations (mass percentage %):

[0032] Here, we would like to specifically mention the example of high-efficiency NO removal in cement clinker kilns. X The exhaust gas aftertreatment system is based on an earlier application by the applicant (refer to the earlier application of the patent applicant: A High-Efficiency NO Removal System for Cement Clinker Kilns). X The prior application for a tail gas after-treatment system (application number: 2025106089708, not yet published) aims to purify and treat the tail gas of a cement clinker kiln to meet environmental standards, including NO. X、Waste heat power generation for cooling, dust removal and cooling by dust removal units, high-temperature isotopic reduction purification inside the kiln, and step-by-step calibration technology using specialized intelligent calibration pyrolysis furnace equipment and low-temperature catalytic cracking agents are all ways to achieve environmental compliance and NO removal. X The innovative methods have already surpassed the existing national standards for denitrification.

[0033] The advanced purification steps in this application should include the technological innovations of the prior application: high-temperature denitrification in the clinker kiln and post-treatment steps to ensure the exhaust gas meets emission standards. This application only uses a heat exchanger to cool the compliant exhaust gas to ≤40℃ as a starting point. This creates conditions for advanced exhaust gas purification—efficient CO2 interception and filtration: enabling the CO2 in the exhaust gas to meet national environmental standards for compliant discharge and achieving the basic condition of ≤40℃ required by this application. This perfectly matches the novel organic compound amine and creates process conditions consistent with dry advanced purification, further enhancing CO2 capture and concentration.

[0034] The advanced purification method utilizes dry purification and fine-tuning interception tower 1. The key to converting CO2 into resources lies in the CO2 enrichment system, which meets national and industry standards for raw materials. This is crucial for producing high-quality ammonium chloride and hydrated magnesium carbonate, widely used in industry and agriculture. This enables enterprises to obtain considerable economic benefits, which is the fundamental condition and vitality for the sustainable development of advanced CO2 emission reduction and efficiency improvement treatment of industrial furnace flue gas.

[0035] In this application, optimizing the combination of activated carbon particles and the low-temperature dry purification tower of the specialized deep purification equipment is particularly important for further removing NO from the qualified flue gas. X The conversion of harmful residues such as particulate matter into resource-based standards plays a crucial role. Optimize the preparation of activated carbon granules: Currently used for NO removal X Activated carbon is generally made from high-quality anthracite and is used for NO removal. X Low efficiency; this invention uses lean coal and weakly caking coal as base materials to produce optimized activated carbon particles, which are then used as adsorbents, catalysts, and NO removal agents. X High efficiency.

[0036] Optimize the preparation of activated carbon granules: Methods for preparing activated carbon granules include: A. Lean coal and weakly caking coal are mixed, with the raw material ratio being: lean coal: weakly caking coal = 70:30; B. The mixture from step A is formed into Φ5×7mm cylindrical particles using a cylindrical forming machine, followed by dry distillation and activation with steam. Detailed preparation method of the above activated carbon granules: Lean coal and weakly caking coal are mixed and formed into Φ5×7mm columnar particles using a cylindrical forming machine. The mixture is then subjected to dry distillation at a final temperature not lower than 600℃. Finally, it is activated with steam at 850-950℃ to produce Φ5×7mm columnar optimized activated carbon particles.

[0037] In the advanced purification equipment described in this application, highly efficient optimized activated carbon particles play a crucial role. Their combination with the specialized dry purification and fine-tuning interception tower is particularly important for further removing NO from the exhaust gas. X The conversion of harmful residues such as metal micropowder into resource-based standards plays a crucial role.

[0038] Novel organic composite amine cosolvents play a crucial role in CO2 enrichment processes: the cosolvent formed by combining organic composite amine aqueous solution with corrosion inhibitors, antioxidants, and absorbents not only possesses anti-corrosion and anti-oxidation properties, effectively preventing corrosion of specialized equipment, but also allows the solubility of CO2 in the aqueous solution to be regulated by changes in temperature and pressure, thereby significantly reducing the processing cost of CO2 resource conversion.

[0039] Key equipment and process steps in the CO2 enrichment process include: CO2 capture in the absorption tower and CO2 release in the regeneration tower. In the absorption tower, CO2 in the exhaust gas is gradually heated to 80-120℃ at a temperature ≤40℃ using an amine pump and heat exchanger. It is then sprayed into the regeneration tower from the top. Inside the regeneration tower, a novel organic composite amine solution decomposes and releases CO2 under heat. The CO2 is then gradually cooled and depressurized to a concentration of 85-95% using a gas-liquid separator, and then transported to process 3 (the production process for hydrated magnesium carbonate and ammonium chloride) to form high-value CO2 product raw materials. The CO2 gas raw material with a purity of 85-95% collected from the deep purification exhaust gas of industrial furnaces is combined with industrial magnesium chloride and ammonium chloride solutions. The hydrated magnesium carbonate and ammonium chloride are then separated by a centrifugal pump, dehydrated, and dried to produce hydrated magnesium carbonate and ammonium chloride products that meet national and industry standards.

[0040] Flue gas with a temperature ≤40℃ after deep purification is introduced through the bottom inlet of the absorption tower, which is equipped with a packing layer. The flue gas undergoes mass transfer and heat absorption within the packing layer as atomized novel organic compound amine solution is sprayed from top to bottom. CO2 gas is efficiently absorbed by the novel organic compound amine solution and remains at the bottom of the absorption tower, becoming a rich solution. Unabsorbed gas is washed with a scrubbing liquid at the top of the absorption tower, then demisted and collected by a high-efficiency demister before being discharged into the atmosphere through pipelines. Measurements show that the CO2 emission content during the venting process is only 1%, with CO2 retention exceeding 96%, achieving deep CO2 emission reduction. The compliant CO2 recovery cost is 274 yuan / t, which is beneficial for the conversion and reuse of in-situ resources.

[0041] The gas is pumped from the bottom of the absorption tower to a gas-liquid heat exchanger for heat exchange. It then enters the heat exchanger and is heated to approximately 80-120°C before being sprayed into the regeneration tower from the top. Heating releases CO2, which, along with a large amount of water vapor and a small amount of novel organic composite amine solution, is discharged from the top of the regeneration tower. The CO2 then exchanges heat with the rich liquid pumped by the amine pump in the gas-liquid heat exchanger, further reducing the gas temperature. Circulating water then enters the heat exchanger for heat exchange, and subsequently enters the gas-liquid separator. In the separator, the condensate entrained in the gas is separated, and the CO2 gas is discharged by an induced draft fan, directly completing the isotopic resource recovery and being directly introduced into the dedicated system for enhancing product efficiency.

[0042] This invention includes a high-pressure steam boiler, using high-temperature steam as a heat source. Insulation devices are installed on the lower outer shell of the regeneration tower, such as... Figure 4 As shown, to ensure that the temperature inside the regeneration tower is 110℃, computer control is used to maintain the temperature inside the regeneration tower at 110℃.

[0043] The novel organic compound amine solution drawn from the bottom of the regeneration tower is cooled from 110℃ to 80℃ via a heat exchanger. It then merges with the novel organic compound amine solution stream P, which has been separated by a gas-liquid separator. The mixture is then pumped to a cooler, where its temperature is further reduced to ≤40℃. After filtration, the solution enters the upper part of the absorption tower via a spray nozzle, allowing for the recycling of the novel organic compound amine solution within the absorption tower and improving the repeated collection of CO2.

[0044] Using CO2 as a raw material, it reacts with industrial magnesium chloride and ammonia in a carbonization tank. The reaction formula is as follows:

[0045] Magnesium chloride solution is prepared by mixing magnesium chloride and water in a magnesium chloride aqueous solution preparer. After stirring, the solution enters a carbonization tank, where ammonia and CO2 also enter. After stirring, hydrated magnesium carbonate and ammonium chloride are generated and then pumped into a centrifugal pump. The hydrated magnesium carbonate precipitate is then dried in a hydrated magnesium carbonate dryer to obtain hydrated magnesium carbonate. The ammonium chloride solution is pumped from the storage tank to the ammonium chloride concentration and crystallization tower via a centrifugal pump. After concentration and crystallization, the solution enters an intermediate storage tank. A portion of the solution is then pumped back to the ammonium chloride concentration and crystallization tower via a circulation pump. Another portion is pumped through an ammonium chloride centrifugal pump, and the precipitate is dried in an ammonium chloride dryer to obtain ammonium chloride. In addition, a low-concentration ammonium chloride solution is pumped from the storage tank to the sodium chloride concentration and crystallization tower via a booster pump for further concentration and crystallization.

[0046] The method of deep CO2 emission reduction and efficiency improvement in industrial furnace flue gas not only eliminates CO2 pollution to the environment, but also uses the intercepted CO2 as raw material, combined with industrial magnesium chloride, ammonia, and industrial water, to produce hydrated magnesium carbonate and ammonium chloride, which are widely used in industry and agriculture and are of high price. This allows enterprises to obtain substantial economic benefits. This is the fundamental condition and vitality for the sustainable development of deep CO2 emission reduction and efficiency improvement in industrial furnace flue gas.

[0047] The following analysis, in conjunction with the accompanying drawings and descriptions, a list of embodiments, and some empirical data, further elucidates the innovative ideas and technical solutions of the present invention, and fully elaborates on the key innovative points of the invention. This method for deep CO2 emission reduction and efficiency improvement not only eliminates the CO2 greenhouse effect and improves the environment, but also achieves deep CO2 emission reduction and efficiency improvement, resulting in significant economic benefits.

[0048]

[0049] Brief description of the efficiency enhancement of this patent: Input-output calculation (in grams of molecular weight):

[0050] Raw material input costs: : 95:138 = X:1000 grams; X = 95 / 138 * 1000 grams = 688.4058 grams; 0.6884058 * 0.6 = 0.413043 yuan; : 34:138 = X:1000 grams; X = 34 / 138 * 1000 grams = 246.3768 grams; 0.2463768 * 3.5 = 0.8623188 yuan; CO2: 44:138 = X:1000 grams; X = 44 / 138 * 1000 grams = 318.8406 grams = 0.3188406 kg; 0.3188406 * 0.274 = 0.087362 yuan; H2O: 72:138 = X:1000 grams; X = 72 / 138 * 1000 grams = 521.7391 grams = 0.5217391 kg; 0.5217391 * 8 = 4.1739 yuan; Efficiency Improvement Input-Output Calculation: The profit calculation for an investment of 100 million yuan, a 3-year infrastructure construction period, and 7 years of operation after commissioning is as follows: Infrastructure investment: Interest over three years (6% annual interest rate): 100 million × 6% × 3 = 18 million yuan; Principal: 100 million; Total investment: 118 million yuan; 1t The corresponding input materials, prices, and costs are calculated in grams of molecular weight: Chemical formula: ; Relative molecular mass: MgCl2=95; 2NH3=34; CO2=44; 4H2O =72; 2NH4Cl =106; MgCO3·3H2O =138; Producing 1 ton Amount of substance required: 1000kg 1000 ÷ 138 = 7.246; Corresponding raw material input (kg) MgCl2: 95 × 7.246 = 688.4058 kg; 0.6884058 × 600 = 413.043 yuan; 2NH3: 34 × 7.246 = 246.3768 kg; 0.2463768 × 3500 = 862.3188 yuan; CO2: 44 × 7.246 = 318.824 kg; 0.318824 × 274 = 87.36 yuan; 4H₂O: 72 × 7.246 = 521.7391 kg; 0.5217391 × 8 = 4.1738 yuan; depreciation: 118 million ÷ 100,000 ÷ 7 = 168.5714 yuan; Material consumption (kg) and cost (yuan) for producing 1 ton of hydrated magnesium carbonate:

[0051] Depreciation: 168.5714; Labor: 120; Power: 268.5; Total: 1923.967; Generate 1t 1923.967 yuan; 1t Output price: 3500 yuan; Price of ammonium chloride (unit price 680 yuan / t): 106 × 7.246 × 1000 = 768 kg = 0.768 t; 0.768 × 680 yuan = 522.24 yuan; Total: 4022.24 yuan; Profit per ton: 4022.24 - 1923.967 = 2097.273 yuan; 100,000 tons per year Annual profit: 209.7273 million yuan; Profits over 7 years of production: 1.46809 billion yuan; After deducting the infrastructure investment of 118 million yuan, the profit is 1.46809 billion yuan - 118 million yuan = 1.35009 billion yuan; Investment recovery rate = 13.5009 ÷ 1.18 = 1144.14%.

[0052] The inventiveness of the process provided in this invention is mainly reflected in the complete realization of industrialization requirements through the supporting process equipment.

[0053]

[0054] A mixture of 70% lean coal and 30% weakly caking coal (powdered coal no larger than 7 mm) is formed, stirred until homogeneous, granulated into columnar particles, and then subjected to dry distillation. The particles are then activated with high-temperature steam to form optimized activated carbon particles.

Claims

1. A process for deep CO2 interception and in-situ efficiency enhancement of industrial furnace exhaust gas, the method comprising calibrating and high-temperature NO removal of the exhaust gas discharged from the industrial furnace. X Steps for cooling, dust removal, and ensuring the clinker kiln exhaust gas meets emission standards. Its characteristics It also includes a fine-tuning process for further deep purification and simultaneous efficiency enhancement of CO2 in the pretreated exhaust gas, with the following steps: step The pre-treated exhaust gas that has initially met the standards is introduced into the dry purification and fine control interception tower (1) after passing through the heat exchanger (1-17) for micro-dust interception and deep purification treatment, so that the temperature of the pre-treated exhaust gas is reduced to ≤40℃ and the CO2 concentration is increased by 3-5%, thereby achieving further purification and resource-based concentration pretreatment. step CO2 with a concentration of not less than 28% after deep purification is sent to the CO2 enrichment system through the deep purification tail gas outlet (1-12) of the dry purification and fine control interception tower (1). Pre-processing of resources for conversion; utilizing CO2 enrichment systems The gas-liquid separator (2-2-4) in the middle forms two streams: a novel organic composite amine solution stream P and a CO2 gas stream f. Using specialized equipment, an absorption tower (2-1-0) and a regeneration tower (2-2-0) respectively achieve the tasks of CO2 re-capture and resource concentration, before the CO2 is led out to the enrichment system. ; step The novel organic composite amine solution P, cooled by an amine pump (2-2-6) and a heat exchanger (Z6), and the novel organic composite amine solution from the bottom of the regeneration tower (2-2-0) are sprayed out from the top sprinkler (2-1-3) inside the absorption tower (2-1-0). This forms a convection flow with the deeply purified tail gas introduced from the bottom deep-purification tail gas inlet (2-1-2) of the absorption tower (2-1-0), thus achieving a CO2 enrichment system. The CO2 is then recaptured; and then, with the aid of an amine pump (2-1-4), the temperature is significantly increased through heat exchangers (Z3) and (Z4) before being introduced into the regeneration tower (2-2-0) to achieve further CO2 concentration. After the CO2 concentration in the CO2 gas stream f reaches the expected target designed in this application, it is then transported to the enhanced production process system. .

2. The deep CO2 interception and in-situ efficiency enhancement of industrial furnace tail gas as described in claim 1 The process method is characterized by, In the process steps The specialized equipment used in this process is a dry purification and fine control interception tower (1), which has a cylindrical tower structure and five layers of three types of boiling interception filter beds inside; from top to bottom, the beds are arranged as follows: the 1st, 2nd, 3rd, and 4th beds are for catalytic cracking and NO removal. X The fifth bed is a microporous fine filter ball bed made of stainless steel powder material through a sintering process; each type of bed structure includes optimized activated carbon particles (1-1a), filter mesh layer (1-2) and plate and frame support (1-3) structure, forming a cracking and venting of residual pollution sources, and the depleted optimized activated carbon particles are transported to the fuel bin for recycling.

3. The process method for deep CO2 interception and in-situ efficiency enhancement of industrial furnace tail gas according to claim 1, characterized in that, In the process steps The special equipment in the middle is a dry purification and fine control interception tower (1), and the top of the tower is equipped with a deep purification exhaust gas outlet (1-12); between each type of filter layer, there is an optimized activated carbon particle inlet (1-5), and a dedicated air duct with a programmable flow valve and a hopper (1-7) and a vacuum pump (1-6) that match the dedicated optimized activated carbon particles (1-1a).

4. The process method for deep CO2 interception and in-situ efficiency enhancement of industrial furnace tail gas according to claim 1, characterized in that, Process steps The CO2 enrichment system The specialized equipment includes an absorption tower (2-1-0), a regeneration tower (2-2-0), and a servo-mechanism gas-liquid separator (2-2-4); the specialized equipment is connected by CO2 transmission pipelines and is equipped with heat exchangers (Z). i ), dedicated amine pumps (2-1-4), (2-2-6), and temperature sampling and testing equipment (T i This forms a CO2 enrichment system. .

5. The process method for deep CO2 interception and in-situ efficiency enhancement of industrial furnace tail gas according to claim 1, characterized in that, The steps mentioned CO2 enrichment system The specialized equipment includes an absorption tower (2-1-0), a regeneration tower (2-2-0), and a servo mechanism gas-liquid separator (2-2-4); both the absorption tower (2-1-0) and the regeneration tower (2-2-0) are cylindrical tower structures, and each is equipped with a CO2 solubilizing packing device (2-1-1) inside.

6. The process method for deep CO2 interception and in-situ efficiency enhancement of industrial furnace tail gas according to claim 1, characterized in that, step The so-called CO2 enrichment system The ambient temperature inside the specialized absorption tower (2-1-0) is designed not to exceed 40℃.

7. The process method for deep CO2 interception and in-situ efficiency enhancement of industrial furnace tail gas according to claim 1, characterized in that, The steps CO2 enrichment system The dedicated regeneration tower (2-2-0) has a process temperature of 103-110℃ and is equipped with a heat insulation device (2-2-3) on its outer shell. A dedicated new type of organic composite amine solution conveying pipeline is installed between the absorption tower (2-1-0) and the regeneration tower (2-2-0). The pipeline is equipped with heat exchangers Z2-Z6 and process temperature test points (T). i A CO2 enrichment system is formed by using a servo-mechanism gas-liquid separator (2-2-4) and dedicated amine pumps (2-1-4) and (2-2-6). The process structure design.

8. The process method for deep CO2 interception and in-situ efficiency enhancement of industrial furnace tail gas according to claim 1, characterized in that, The steps The efficiency-enhancing production process system mentioned in the text The structural design includes the main equipment carbonization tank (3-0) and the auxiliary equipment ammonium chloride concentration crystallization tower (3-1), and also includes servo feeding subsystems for two dedicated production equipment: Servo Subsystem 1: A dedicated liquid raw material conveying device for the main equipment carbonization tank (3-0); including magnesium chloride and purified water raw material pipelines, which are connected to the magnesium chloride solution preparation tank (0-3-0). The tank is equipped with a stirrer (0-3-1), and a liquid magnesium chloride passage is set at the bottom of the tank. The pipeline is connected to the carbonization tank (3-0). Together with CO2 and gaseous ammonia (3-0-3), it forms the raw material conveying servo subsystem 1 of the main equipment. Servo Subsystem 2: This is the raw material conveying channel of the ammonium chloride concentration crystallization tower (3-1). It consists of a storage tank (3-0-7), a booster pump (3-0-8), and the upper inlet of the ammonium chloride concentration crystallization tower (3-1) to form the first channel. The second channel is formed by passing through the storage tank (3-1-6), the booster pump (3-1-7), and the middle of the ammonium chloride concentration crystallization tower (3-1). The third channel is formed by returning from the intermediate storage tank (3-1-2) to the top of the concentration crystallization tower via the circulation pump (3-1-1). The above three channels together constitute the concentration grading servo subsystem 2 of the ammonium chloride concentration crystallization tower (3-1).

9. The process method for deep CO2 interception and in-situ efficiency enhancement of industrial furnace tail gas according to claim 1, characterized in that, The steps described The optimized activated carbon particles in the dry purification and fine control interception tower (1) of the special equipment are made by mixing 70% lean coal and 30% weakly caking coal powdered coal with a diameter of no more than 7 mm as the base material, mixing the mixture evenly, making columnar particles and dry distilling them, and then activating them with high temperature steam.

10. The process method for deep CO2 interception and in-situ efficiency enhancement of industrial furnace tail gas according to claim 1, characterized in that, The steps described The amine pumps (2-1-4) and (2-2-6) represent a novel organic compound amine solution delivery device, which is a special device used to replenish the co-solvent. The device consists of an amine pump and an organic compound amine tank connected in series, and is located in the middle of the novel organic compound amine solution P delivery pipeline. The organic compound amine tank is equipped with a novel organic compound amine solution pool and a vaporization channel. The novel organic compound amine solution is modified with monoethanolamine as the main body, and is mainly composed of an aqueous solution with a mass percentage of ≤30%. The added auxiliary components and mass percentages are: corrosion inhibitor potassium vanadate 1.1%~6%, antioxidant V2O5 0.4%~1.2%, co-solvent tetraethylenepentamine 16%~22%, and other components are weakly alkaline water.

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