Drying system for dry-process deacidification of baking soda

Abstract

The utility model discloses a baking soda dry method deacidification drying system which comprises a PV / T heat collector, the PV / T heat collector is provided with a cold water inlet and a hot water outlet, the hot water outlet is connected with a first inlet of a heat accumulator, and a first hot water outlet of the heat accumulator is connected with a hot water coil pipe of a baking soda storage bin. A second hot water outlet of the heat accumulator is connected with a hot water coil pipe in the baking soda discharging bin, a water outlet of the hot water coil pipe is connected with a cold water inlet of the heat accumulator, a first cold water outlet of the heat accumulator is connected with a cold water inlet of the PV / T heat collector through a first pipeline, and a circulating water pump is arranged on the first pipeline. By changing the structures of the baking soda storage bin and the baking soda discharging bin, baking soda is dried and kept dry in the storage and discharging process, the problem that the baking soda is prone to deliquescence deterioration, caking and arching to cause blockage of a feeding system is solved, the deacidification efficiency and the raw material utilization rate are improved, no waste gas and waste water are generated, and the production cost is reduced. And the purposes of environmental protection, pollution reduction, carbon reduction, energy conservation and efficiency improvement are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of dry deacidification, and in particular relates to a baking soda dry deacidification drying system. Background Art

[0002] Flue gas desulfurization (FGD) at waste incineration power plants mostly uses a lime slurry semi-dry desulfurization process. This process suffers from low utilization, fly ash buildup on the desulfurization tower walls, high atomizer failure rates, ash accumulation and blockage in the horizontal flue gas duct at the desulfurization tower outlet, and high operation and maintenance costs. Baking soda dry desulfurization has attracted widespread attention due to its high removal efficiency, simple process, low energy consumption, no wastewater or acid disposal issues, minimal flue gas temperature drop, which facilitates exhaust diffusion through the chimney and eliminates "white smoke." The purified flue gas does not require secondary heating and is less corrosive. However, existing baking soda systems also present some challenges. Baking soda sacks stored inside the plant are prone to moisture absorption and deterioration; the large storage capacity of the baking soda silo and the long storage time lead to the baking soda becoming compacted and clumped; and the addition of a blower at the bottom outlet of the baking soda silo allows moisture to enter in humid weather, potentially causing hydrolysis of the baking soda and compromising subsequent desulfurization and purification. In coastal areas or humid weather, the surface of the silo with lower temperature will condense into water droplets when encountering warm and humid air currents. The water droplets will seep into the feed silo along the gaps in the silo, causing the baking soda to hydrolyze. The baking soda powder will absorb water, stick, clump and arch in the powder silo, causing the feeding system to be blocked. At the same time, it will affect the subsequent grinding and deacidification reactions, causing the entire desulfurization system to operate unstable.

[0003] Utility model CN218590174U, "A system for removing acidic substances from flue gas after solid waste incineration," provides a system for removing acidic substances from flue gas after solid waste incineration, comprising a baking soda injection system, a flue reactor, a bag filter, an induced draft fan, and a chimney, all connected in sequence. This system is characterized by a jet fan at the outlet of the screw feeder that sprays the raw baking soda powder into the grinder, effectively preventing the baking soda powder from compacting. However, this system only sprays the baking soda at the feeder outlet into the grinder, and does not address the problem of baking soda absorbing moisture during storage and transportation. This problem of raw material moisture absorption can still cause problems during the grinding process, impacting the grinding equipment. Furthermore, since the particles are smaller after grinding, the baking soda that absorbs moisture can compact more severely, leading to pipeline blockage and reduced deacidification efficiency.

[0004] Invention CN115805013A, "A Coke Oven Flue Gas Treatment System," provides a coke oven flue gas treatment system. It includes a feeding device comprising a feeding platform, a silo mounted on the platform, and a silo for storing baking soda powder, with a silo cover placed on top. This system addresses the problem of baking soda powder silos, which can cause blockages in the feeding system due to moisture absorption, resulting in compaction, caking, and arching. However, the system incorporates multiple crisscrossing heating pipes within the silo, significantly increasing energy consumption and economic costs.

[0005] Invention CN112642272A, "A Method for Treating Coal-Fired Flue Gas with Dry Desulfurization Using Baking Soda," discloses a method for treating coal-fired flue gas with dry desulfurization using baking soda. The method uses baking soda as a raw material to treat acidic pollutants in the flue gas. The baking soda undergoes a pretreatment process before reacting with the coal-fired flue gas as a reaction material. By preheating the baking soda powder, the preheated baking soda quickly reaches its decomposition temperature, thereby increasing the reaction rate of the device. However, ① the use of an electric heater to preheat the baking soda in the raw material bin increases energy consumption and costs; ② even with electric heating, the baking soda powder accumulates in the silo, but sufficient heating of the center of the powder accumulation area cannot be guaranteed, thus failing to prevent subsequent compaction and blockage and improve efficiency.

[0006] In summary, no current baking soda dry deacidification system can address the problems of compaction, arching, pipe blockage, and low utilization associated with baking soda deacidification systems while simultaneously utilizing the highly efficient, energy-efficient, pollution-free, renewable, and sustainable solar-coupled heat pump technology to generate electricity and heat. Designing a green and clean solution is crucial for waste-to-energy plants to achieve clean energy substitution, improve energy efficiency, reduce operating costs, and achieve synergistic improvements in pollution and carbon reduction. Utility Model Content

[0007] Technical problems solved: In response to the above technical problems, the utility model provides a baking soda dry deacidification drying system, which can effectively dry baking soda powder, avoid the efficiency reduction and equipment and pipeline blockage caused by the deterioration of baking soda powder due to moisture absorption, and greatly reduce the failure rate of the baking soda deacidification system.

[0008] Technical solution: A baking soda dry deacidification and drying system includes a PV / T collector, the PV / T collector is provided with a cold water inlet and a hot water outlet, the hot water outlet is connected to the first inlet of the heat accumulator, the first hot water outlet of the heat accumulator is connected to the hot water coil of the baking soda storage bin, the second hot water outlet of the heat accumulator is connected to the hot water coil in the baking soda discharge bin, the water outlet of the hot water coil is connected to the cold water inlet of the heat accumulator, the first cold water outlet of the heat accumulator is connected to the cold water inlet of the PV / T collector through a first pipe, and the first pipe is provided with a circulating water pump.

[0009] Preferably, the hot water coils of the baking soda storage bin are arranged around and at the bottom of the baking soda storage bin.

[0010] Preferably, the baking soda discharge silo includes an automatic unpacking machine, which is arranged at the feed port of the baking soda discharge silo. Several layers of heating plates are provided on the inner wall of the baking soda discharge silo. One end of the heating plate is connected to the inner wall of the baking soda discharge silo, and the other end is provided with a discharge port on the inner wall of the baking soda discharge silo, and the two adjacent discharge ports are in opposite directions.

[0011] Furthermore, the hot water coil in the heating plate is connected to the second hot water outlet of the heat accumulator.

[0012] Furthermore, a scraper is provided at one end of the heating plate connected to the inner wall of the baking soda lower hopper, the scraper is provided with a control system, and the bottom of the scraper is always in contact with the heating plate.

[0013] Furthermore, the angle between the heating plate and the horizontal direction is 0-15°.

[0014] Preferably, the baking soda dry deacidification drying system also includes an evaporator, the low-temperature and low-pressure steam outlet of the evaporator is connected to the inlet of the compressor, the outlet of the compressor is connected to the high-temperature and high-pressure gas inlet of the condenser, the high-pressure liquid outlet of the condenser is connected to the inlet of the throttle valve, the outlet of the throttle valve is connected to the low-temperature and low-pressure liquid inlet of the evaporator, the second cold water outlet of the heat accumulator is connected to the second water inlet of the heat accumulator through a second pipe, and the second pipe is coiled on the outer wall of the condenser to transfer the heat of the condenser to the heat accumulator.

[0015] Furthermore, it also includes an underground coil, which is partially set underground to absorb ground heat; the underground coil is partially wound around the outer side wall of the evaporator to transfer the ground heat to the evaporator.

[0016] Furthermore, the electric energy generated by the PV / T collector is supplied to the circulating water pump, the compressor and the control system through the inverter.

[0017] Beneficial Effects: 1) This utility model provides a baking soda dry deacidification drying system that effectively dries baking soda powder, preventing deterioration due to moisture absorption and resulting in reduced efficiency and equipment and pipeline blockage, significantly reducing the operational failure rate of the baking soda deacidification system. The use of a PV / T collector coupled with a ground-source heat pump—a highly efficient, energy-saving, pollution-free, renewable, and sustainable energy utilization method—has a positive effect on conserving traditional energy, improving operational economics, and mitigating air pollution and the greenhouse effect. This contributes to waste incineration power plants contributing to the nation's "dual carbon" goals.

[0018] 2) Solar photovoltaic power generation alone suffers from low efficiency and high costs. PV / T technology recovers and utilizes excess heat while generating electricity. This "one machine, multiple functions" technology cools the battery (increased battery temperature causes a decrease in photovoltaic conversion efficiency), improving power generation efficiency and lifespan. This significantly increases the overall efficiency of solar energy utilization while reducing the costs of separate electricity and heat supply.

[0019] 3) The combination of PV / T solar technology and heat pumps is highly complementary. When there is sufficient solar energy, the ground-source heat pump does not need to be started; when solar energy is insufficient, the ground-source heat pump can be used for heating, ensuring the reliability and stability of the system's continuous operation under different operating conditions.

[0020] 4) The electricity generated by PV / T technology can be used for compressors, circulating water pumps and electronic control systems. Compared with systems that use only electricity as power, it can significantly save electricity consumption and has the characteristics of high operating efficiency, obvious energy saving effect and low operating costs.

[0021] 5) The technology of combining PV / T collectors with heat pumps can reduce the installation area of PV modules and reduce costs;

[0022] 6) Circulating hot water pipes are added around and at the bottom of the baking soda storage bin to prevent the baking soda from absorbing moisture and hardening during storage in the factory, which would affect subsequent transportation and reaction.

[0023] 7) The baking soda feeding silo structure was redesigned and multiple layers of heating plates were added to ensure that the baking soda powder was heated layer by layer within a certain temperature range during the feeding process and fully dried;

[0024] 8) Each layer of heating plate is equipped with a scraper. By controlling the height, angle, length and other parameters of the scraper, the drying process of the baking soda can be flexibly controlled. At the same time, the baking soda lumps that have absorbed moisture and become compacted are broken and fully dried during the scraping and falling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a baking soda dry deacidification and drying system of the utility model;

[0026] Figure 2 This is a structural diagram of a small baking soda storage bin of the utility model;

[0027] Figure 3 This is a structural diagram of the baking soda feed bin of the utility model;

[0028] Serial numbers in the figure: 1. PV / T collector, 2. Inverter, 3. Circulating water pump, 4. Evaporator, 5. Condenser, 6. Throttle valve, 7. Compressor, 8. Heat accumulator, 9. Underground coil, 10. Baking soda storage silo, 10-1. Baking soda powder ton bag, 11. Baking soda discharge silo, 11-1. Automatic unpacking machine, 11-2. Scraper, 11-3. Heating plate, 12. Hot water coil. DETAILED DESCRIPTION

[0029] The technical solution of the present utility model is further described in detail below with reference to the accompanying drawings. Example 1

[0030] Reference Figure 1-Figure 3 The PV / T collector coupled with the ground-source heat pump system operates as follows: the PV / T collector 1 generates electricity and heat. The generated electricity is used for internal use within the factory through the inverter 2, including the operation of the compressor 7 and the circulating water pump 3, as well as the electronic control of the baking soda deacidification system. The heat source of the heat accumulator 8 includes the heat generated by the PV / T collector 1 and the ground-source heat pump. The ground-source heat pump includes an evaporator 4, a condenser 5, a throttle valve 6, a compressor 7, and an underground coil 9.

[0031] Under sufficient sunlight conditions, cold water enters the bottom of the PV / T collector 1 and is heated, and hot water at the top that reaches the set temperature flows into the heat accumulator 8 for storage, and this cycle produces hot water; when the hot water produced by solar energy is insufficient or the amount of hot water used is too large, the ground source heat pump is put into use, and the ground source heat is transferred to the evaporator 4 through the buried coil 9. The liquid working medium absorbs heat in the evaporator 4 and becomes low-temperature, low-pressure superheated steam. After adiabatic compression in the compressor 7, it becomes high-temperature, high-pressure gas, and then is condensed into high-pressure liquid at a constant pressure in the condenser 5, releasing the heat of vaporization of the working medium, and undergoing heat exchange with the water in the second pipeline, so that it is heated into hot water and stored in the heat accumulator 8 for use. The high-pressure liquid is then converted into low-temperature, low-pressure liquid through the throttle valve 6, enters the evaporator 4 to absorb heat and become low-temperature, low-pressure steam, and this cycle continuously produces hot water.

[0032] The heat accumulator 8 is connected to the baking soda storage bin 10 and the baking soda discharge bin 11, providing heat sources for the two systems:

[0033] A portion of the hot water in the heat accumulator 8 is used to heat the baking soda storage bin 10. Hot water coils 12 are laid on the surrounding walls and bottom floor of the baking soda storage bin 10 to ensure that the baking soda powder ton bag 10-1 will not deliquesce and deteriorate during long-term storage, which would affect the efficiency of subsequent reactions and cause problems such as clogging equipment and pipelines.

[0034] Another part of the hot water in the heat accumulator 8 is used to heat the baking soda discharge hopper 11. After the baking soda powder ton bag is opened by the automatic unpacking machine 11-1, it falls into the first layer of heating plate 11-3. A powder discharge port is left on the left side of the heating plate 11-3, and the other edges are tightly fitted with the baking soda discharge hopper 11 to prevent the powder from falling. The heating plate 11-3 forms a certain inclination angle (0~15°) with the horizontal line, which helps the powder to fall and increases the contact area between the powder and the heating plate 11-3. Heating plate 11-3 houses a hot water coil 12, providing heat for the heating plate 11-3. A scraper 11-2 scrapes the baking soda. Its direction and length can be freely adjusted by the control system (DCS or PLC), allowing the baking soda to be scraped from the first heating plate to the second. The discharge port of the second heating plate is located opposite to that of the first, with all other parameters remaining unchanged. In this manner, the baking soda is heated on the heating plates 11-3 and subsequently falls to the surface after passing through four layers of heating plates 11-3. The drying time of the baking soda can be adjusted by controlling the scraper 11-2 to ensure smooth subsequent operation and reaction. The temperature of each hot water coil 12 is maintained below 50°C, and the cold water outlet of each hot water coil 12 is connected to the cold water inlet of the heat accumulator 8, enabling reuse.

[0035] The embodiments of this specific implementation method are all preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the scope of protection of the present utility model.

Claims

1. A baking soda dry deacidification and drying system, characterized by: The invention comprises a PV / T heat collector, wherein the PV / T heat collector is provided with a cold water inlet and a hot water outlet, the hot water outlet is connected to a first inlet of a heat accumulator (8), the first hot water outlet of the heat accumulator (8) is connected to a hot water coil (12) of a baking soda storage bin (10), the second hot water outlet of the heat accumulator (8) is connected to a hot water coil (12) in a baking soda discharge bin (11), the water outlet of the hot water coil (12) is connected to the cold water inlet of the heat accumulator (8), the first cold water outlet of the heat accumulator (8) is connected to the cold water inlet of the PV / T heat collector via a first pipe, and a circulating water pump (3) is provided on the first pipe.

2. The baking soda dry deacidification and drying system according to claim 1, characterized in that: The hot water coil (12) of the baking soda storage bin (10) is arranged around and at the bottom of the baking soda storage bin (10).

3. The baking soda dry deacidification and drying system according to claim 1, characterized in that: The baking soda feeding bin (11) comprises an automatic unpacking machine (11-1), the automatic unpacking machine (11-1) being arranged at a feeding port of the baking soda feeding bin (11), a plurality of heating plates (11-3) being arranged on an inner side wall of the baking soda feeding bin (11), one end of the heating plate (11-3) being connected to the inner side wall of the baking soda feeding bin (11), and the other end of the heating plate (11-3) being provided with a feeding port on the inner side wall of the baking soda feeding bin (11), and two adjacent feeding ports being arranged in opposite directions.

4. The baking soda dry deacidification and drying system according to claim 3, characterized in that: The hot water coil (12) in the heating plate (11-3) is connected to the second hot water outlet of the heat accumulator (8).

5. The baking soda dry deacidification and drying system according to claim 3, characterized in that: A scraper (11-2) is provided at one end of the heating plate (11-3) connected to the inner wall of the baking soda lower hopper (11). The scraper (11-2) is provided with a control system, and the bottom of the scraper (11-2) always contacts the heating plate (11-3).

6. The baking soda dry deacidification and drying system according to claim 3, characterized in that: The angle between the heating plate (11-3) and the horizontal direction is 0-15 degrees.

7. The baking soda dry deacidification and drying system according to any one of claims 1 to 6, characterized in that: The invention also includes an evaporator (4), wherein the low-temperature and low-pressure steam outlet of the evaporator (4) is connected to the inlet of the compressor (7), the outlet of the compressor (7) is connected to the high-temperature and high-pressure gas inlet of the condenser (5), the high-pressure liquid outlet of the condenser (5) is connected to the inlet of the throttle valve (6), the outlet of the throttle valve (6) is connected to the low-temperature and low-pressure liquid inlet of the evaporator (4), and the second cold water outlet of the heat accumulator (8) is connected to the second water inlet of the heat accumulator (8) through a second pipe, and the second pipe is coiled on the outer wall of the condenser (5).

8. The baking soda dry deacidification and drying system according to claim 7, characterized in that: It also includes an underground coil (9), wherein the underground coil (9) is partially arranged underground and partially wound on the upper outer wall of the evaporator (4).

9. The baking soda dry deacidification and drying system according to claim 7, characterized in that: The electric energy generated by the PV / T collector is used to supply power to a circulating water pump (3), a compressor (7) and a control system via an inverter (2).

Images