A system for venting air for power generation and pellet cooling medium
By designing a system that uses vented air for power generation and as a cooling medium for granulation, the problem of carbon dioxide waste in ammonia synthesis production was solved, achieving efficient utilization and reduced energy consumption, and improving the controllability of the granulation process and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUBEI SANNING CHEM
- Filing Date
- 2025-06-27
- Publication Date
- 2026-06-16
AI Technical Summary
In the process of ammonia synthesis, the direct release of carbon dioxide after decarbonization leads to resource waste and failure to be effectively utilized, increasing energy consumption and costs.
Design a system for using vented air as a cooling medium for power generation and granulation, including a residual pressure tail gas carbon dioxide system, a turbine generator system, a CO2 heat exchanger, a rotary drum spray granulation system, a granulation screening machine, and a granulation cooler. Through process optimization, the system achieves the exchange of matter and energy, and utilizes high-purity carbon dioxide for power generation and granulation cooling.
This achieves efficient resource reuse of carbon dioxide, reduces energy consumption and costs, and improves the controllability of the granulation process and product quality.
Smart Images
Figure CN224358380U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of residual pressure exhaust gas technology, specifically relating to a system for releasing air for power generation and granulation cooling medium. Background Technology
[0002] Ammonia is a crucial inorganic chemical product, playing a vital role in the national economy. 80% of ammonia is used in the production of chemical fertilizers, while 20% serves as a raw material for other chemical products. Ammonia is primarily used in the manufacture of nitrogen fertilizers and compound fertilizers, such as urea, ammonium nitrate, ammonium phosphate, ammonium chloride, and various nitrogen-containing compound fertilizers, all of which rely on ammonia as a raw material. Ammonia accounts for half of the world's production as an industrial raw material and for ammonified animal feed. Nitric acid, various nitrogen-containing inorganic salts and organic intermediates, sulfonamides, polyurethane, polyamide fibers, and nitrile rubber all require ammonia as a direct raw material.
[0003] The main steps in industrial ammonia synthesis include raw material processing, gasification, desulfurization, compression, shift conversion, decarbonization, fine desulfurization, methanation, and final ammonia synthesis. Using anthracite as raw material, the anthracite is first converted into semi-water gas in a gasifier, followed by desulfurization. The gas then passes through two compressor stages and enters a shift converter, where carbon monoxide is converted into hydrogen. The shifted gas undergoes further desulfurization, followed by further compression and desulfurization in compressor stage 3. The gas then passes through a copper washing unit and enters compressor stages 4 and 5, where ammonia is finally synthesized to produce ammonia.
[0004] The converted raw material gas contains a large amount of carbon dioxide, which must be completely removed before entering the ammonia synthesis process. Only a small portion of the removed carbon dioxide is used as raw material for manufacturing urea, ammonium bicarbonate, and soda ash, while the majority is directly vented. The carbon dioxide after decarbonization has high purity, and direct venting results in a large waste of resources. Utility Model Content
[0005] The purpose of this invention is to provide a system for releasing air for power generation and as a cooling medium for granulation. It utilizes carbon dioxide released during the decarbonization process in the ammonia synthesis production process as an energy source for power generation and cooling the rotary drum spray granulation. Through process optimization, it achieves the exchange of matter and energy, reduces energy consumption and costs, and improves the efficiency of resource reuse.
[0006] To solve the above problems, the technical solution of this utility model is as follows:
[0007] A system for releasing air as a power generation and granulation cooling medium includes, in sequence, a residual pressure tail gas carbon dioxide system, a turbine generator system, a CO2 heat exchanger, a rotary drum spray granulation system, a granulation screening machine, a granulation cooler, and a large-particle fertilizer conveying system. The liquid fertilizer conveying system and the seed fertilizer conveying system are connected to the feed inlet of the rotary drum spray granulation system, and the discharge outlet of the granulation screening machine is connected to the seed fertilizer conveying system.
[0008] Furthermore, the gas flow rate of the residual pressure tail gas carbon dioxide system is 90,000~110,000 Nm3 / h.
[0009] Furthermore, the residual pressure tail gas carbon dioxide system has a gas pressure of 0.2~0.3 MPa (a).
[0010] Furthermore, the residual pressure tail gas carbon dioxide system has a gas temperature of 20~30℃.
[0011] Furthermore, the turbine generator set system has an exhaust pressure of 0.1~0.15 MPa (a) and a temperature of 1~-6℃.
[0012] Furthermore, the heat exchange medium in the CO2 heat exchanger is circulating water.
[0013] Furthermore, the control gas temperature input to the rotary drum spray granulation system is 15~20℃.
[0014] The beneficial effects of this utility model are as follows:
[0015] 1. The decarbonized carbon dioxide released from the air can be used for power generation and as a cooling medium for granulation. This not only reduces energy consumption and costs but also generates added value. Because the decarbonized carbon dioxide has high purity, it will not introduce new impurities.
[0016] 2. The temperature of carbon dioxide gas after the turbine generator set generates electricity is very low. By controlling its temperature through circulating water, the particle size, shape and temperature of the granulated particles can be controlled to prevent agglomeration.
[0017] 3. Using a seed-drum granulation method can significantly accelerate the crystallization speed and shorten the crystallization time. By controlling the concentration and distribution of the seed crystals, the particle size and distribution uniformity of the crystals can be adjusted. Attached Figure Description
[0018] The present invention will be further described below with reference to the accompanying drawings:
[0019] Figure 1 This is a schematic diagram of the structure of this utility model.
[0020] In the diagram: 1. Turbine generator set system; 2. CO2 heat exchanger; 3. Rotary drum spray granulation system; 4. Granulation screening machine; 5. Granulation cooler. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] A system for releasing air as a power generation and granulation cooling medium includes, in sequence, a residual pressure tail gas carbon dioxide system, a turbine generator system 1, a CO2 heat exchanger 2, a rotary drum spray granulation system 3, a granulation screening machine 4, a granulation cooler 5, and a large-particle fertilizer conveying system. The liquid fertilizer conveying system and the seed fertilizer conveying system are connected to the feed inlet of the rotary drum spray granulation system 3, and the discharge outlet of the granulation screening machine 4 is connected to the seed fertilizer conveying system.
[0023] In the preferred embodiment, the residual pressure exhaust gas carbon dioxide system has a gas flow rate of 100,000 Nm3 / h, a pressure of 0.263 MPa (a), and a temperature of 27.5℃, while the turbine generator set system has an exhaust pressure of 0.135 MPa (a) and a temperature of -4℃.
[0024] In the preferred embodiment, the heat exchange medium of CO2 heat exchanger 2 is circulating water, and the gas temperature is controlled at 17°C for use by the rotary drum spray granulation system.
[0025] In the preferred embodiment, the granular fertilizer after drum granulation is screened and cooled to obtain large granular slow-release fertilizer with a strength greater than 35N and a particle size greater than 3.5mm.
[0026] In the preferred embodiment, the granulation screening machine 4 screens the small granular fertilizer and sends it to the seed fertilizer conveying system via a conveyor belt. After the small granular fertilizer is mixed with the seed, it enters the rotary drum spray granulation system 3.
[0027] The embodiments described in this specification are merely examples of implementations of the inventive concept. The scope of protection of this utility model should not be considered as limited to the specific forms described in the embodiments. The scope of protection of this utility model also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.
Claims
1. A system for using vented air as a cooling medium for power generation and granulation, characterized in that: The system includes a residual pressure tail gas carbon dioxide system, a turbine generator set system (1), a CO2 heat exchanger (2), a rotary drum spray granulation system (3), a granulation screening machine (4), a granulation cooler (5), and a large-particle fertilizer conveying system, which are connected in sequence. The liquid fertilizer conveying system and the seed fertilizer conveying system are connected to the feed inlet of the rotary drum spray granulation system (3), and the screen discharge outlet of the granulation screening machine (4) is connected to the seed fertilizer conveying system.
2. The system for using vented air as a cooling medium for power generation and granulation according to claim 1, characterized in that: The gas flow rate of the residual pressure tail gas carbon dioxide system is 90,000~110,000 Nm3 / h.
3. The system for using vented air as a cooling medium for power generation and granulation according to claim 1, characterized in that: The residual pressure tail gas carbon dioxide system has a gas pressure of 0.2~0.3 MPa (a).
4. A system for using vented air as a cooling medium for power generation and granulation according to claim 1, characterized in that: The residual pressure tail gas carbon dioxide system has a gas temperature of 20~30℃.
5. A system for using vented air as a cooling medium for power generation and granulation according to claim 1, characterized in that: The exhaust pressure of the turbine generator set system is 0.1~0.15 MPa (a), and the temperature is 1~-6℃.
6. A system for using vented air as a cooling medium for power generation and granulation according to claim 1, characterized in that: CO2 heat exchanger (2) The heat exchange medium is circulating water.
7. A system for using vented air as a cooling medium for power generation and granulation according to claim 1, characterized in that: The control gas temperature for the rotary drum spray granulation system is 15~20℃.