Wet-process acid preparation and power station flue gas desulfurization coupling system
By directly denitrifying and converting SO2 to SO3 after the boiler economizer, and combining the design of the condenser and heat exchanger, the problem of low energy efficiency caused by the first cooling and then heating of flue gas in the wet sulfuric acid production process is solved, achieving efficient energy utilization and a simplified sulfuric acid treatment process.
Patent Information
- Application Number
- CN202423254410.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-28
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-28
AI Technical Summary
The wet acid production process suffers from low energy efficiency due to the initial cooling and subsequent heating of flue gas, especially in regions lacking alkaline resources such as limestone, where the system is complex and consumes a large amount of energy.
A wet sulfuric acid production and power plant flue gas desulfurization coupling system is adopted. The flue gas is directly fed into the dust and nitrogen denitrification integrated equipment after the boiler economizer for denitrification, avoiding the flue gas to be cooled down and then heated up. The high-temperature flue gas is used to convert SO2 into SO3 in the heat exchanger, and sulfuric acid is collected through the condenser. The cooling air is used for the boiler air system, and the low-temperature steam is used for the power plant steam and water system to do further work.
The process of sulfuric acid treatment has been simplified, energy efficiency has been improved, sulfuric acid treatment costs have been reduced, and the process of cooling and then heating the flue gas has been avoided, thus achieving high-efficiency energy utilization.
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Figure CN223595964U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power station flue gas system and waste heat utilization system, be applied to the power station of using wet process of acid technology desulfurization. BACKGROUND
[0002] In the area lacking limestone and other alkaline resources, the wet process of acid technology is used for the flue gas desulfurization of the thermal power plant. Generally, the wet process of acid device is arranged at the outlet of the boiler dust collector, and due to the reaction temperature required by the catalyst being 350~400℃, the flue gas needs to be heated twice after the dust collector at the outlet of the boiler air preheater, and the generated sulfuric acid needs to be condensed twice after the reaction, the system is complex, and the energy consumption is large. UTILITY MODEL CONTENT
[0003] The technical problem to be solved by the utility model is how to avoid the problem of low energy efficiency caused by the wet process of acid flue gas first cooling and then heating, the utility model provides a wet process of acid and power station flue gas desulfurization coupling system, which first removes nitrogen oxides, simplifies the subsequent sulfuric acid processing process, the whole process is simple, and the energy utilization efficiency is high.
[0004] The technical scheme of the utility model is as follows:
[0005] A wet process of acid and power station flue gas desulfurization coupling system, comprising a boiler economizer connected with a boiler, the boiler economizer is connected with a dust and nitrogen integrated device, the output end of the dust and nitrogen integrated device is connected with a reactor inlet flue, the reactor inlet flue is communicated with a reactor, the output end of the reactor is connected with a reactor outlet flue, the reactor outlet flue is connected with a heat exchanger, the output end of the heat exchanger is connected with a heat exchanger outlet flue, the other end of the heat exchanger outlet flue is connected with a condenser, the liquid output port of the condenser is connected with a sulfuric acid processing unit, the gas outlet of the condenser is connected with a condenser outlet flue, the condenser outlet flue is connected with a wet type electric dust collector, the outlet of the wet type electric dust collector is connected with an induced draft fan inlet flue, the induced draft fan inlet flue is connected with the gas inlet of an induced draft fan, and the outlet of the induced draft fan is connected with a chimney through a chimney inlet flue.
[0006] The input end of the heat exchanger is connected with a heat exchanger steam inlet pipeline, and the output end of the heat exchanger is connected with a heat exchanger steam outlet pipeline.
[0007] A cooling fan is arranged on the condenser, and the condenser is further connected with a cooling air outlet air duct, and the other end of the cooling air outlet air duct is communicated with a boiler air system.
[0008] The utility model discloses a beneficial effect is: cancel the air preheater of boiler body, flue gas is from coal economizer export after high temperature dust and nitration integration equipment dedusting denitration, directly into reactor, the cooling air in condenser is heated and enters the boiler wind system, and the steam enters the heat exchanger, and after being heated, enters the power station steam water system and further does work. After coupling, flue gas avoids the process of cooling first and then heating, and since denitration is carried out in advance, the treatment cost of collected sulfuric acid solution is reduced, the whole technological process is simple, and energy utilization efficiency is high. BRIEF DESCRIPTION OF DRAWINGS
[0009] Figure 1 It is the schematic diagram of the utility model. DETAILED DESCRIPTION
[0010] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.
[0011] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.
[0012] As Figure 1 Shown, a kind of wet method and power station flue gas desulfurization coupling system, including the boiler coal economizer 1 being connected with boiler, boiler coal economizer 1 connects dust and nitration integration equipment 2, the output end of dust and nitration integration equipment 2 connects reactor inlet flue 101, reactor inlet flue 101 is communicated with reactor 3, the output end of reactor 3 connects reactor outlet flue 102, reactor outlet flue 102 connects heat exchanger 4, the output end of heat exchanger 4 connects heat exchanger outlet flue 103, the other end of heat exchanger outlet flue 103 connects condenser 5, the liquid output port of condenser 5 connects sulfuric acid processing unit, the gas outlet of condenser 5 connects condenser outlet flue 104, condenser outlet flue 104 connects wet type electric precipitator 6, the outlet of wet type electric precipitator 6 connects induced draft fan inlet flue 105, induced draft fan inlet flue 105 connects the gas inlet of induced draft fan 7, the outlet of induced draft fan 7 is connected through chimney inlet flue 106 with chimney 8.
[0013] It needs to be explained that the input end of the heat exchanger 4 is connected with a heat exchanger steam inlet pipeline 107, and the output end of the heat exchanger 4 is connected with a heat exchanger steam outlet pipeline 108.
[0014] Further, the condenser 5 is also connected with a cooling air outlet air duct 109, and the other end of the cooling air outlet air duct 109 is communicated with a boiler air system.
[0015] Further, the condenser 5 is provided with a cooling fan 9.
[0016] The working principle and working process of the utility model are as follows:
[0017] The air preheater of the boiler is cancelled, the flue gas from the outlet of the coal economizer 1 of the boiler enters the dust and denitration integrated equipment 2 at the temperature of 350~400 DEG C, and after dust removal and denitration, the flue gas enters the reactor 3 through the reactor inlet flue 101, and the conversion of SO2 to SO3 is completed in the reactor 3. The high-temperature acid-containing flue gas enters the heat exchanger 4 through the reactor outlet flue 102, and the temperature of the flue gas after heat exchange is still above the condensation point of sulfuric acid, and then the flue gas enters the condenser 5 through the heat exchanger outlet flue 103, and the liquid sulfuric acid is collected at the bottom of the condenser 5 and sent to a sulfuric acid treatment unit, and the cooled flue gas enters the wet electrostatic precipitator 6 through the condenser outlet flue 104 to further remove acid mist, and the flue gas meeting the emission requirements enters the induced draft fan 7 through the induced draft fan inlet flue 105, and then is discharged into the chimney 8 through the chimney inlet flue 106. The cooling fan 9 is arranged on the condenser 5, the cooling air is heated after passing through the condenser, and can be sent to the boiler air system through the cooling air outlet air duct 109; since the conversion of SO2 to SO3 is an exothermic reaction, the temperature of the acid-containing flue gas is above 400 DEG C, and the heat is absorbed by steam, the low-temperature and low-pressure steam enters the heat exchanger 4 through the heat exchanger steam inlet pipeline 107, and is discharged through the heat exchanger steam outlet pipeline 108 after absorbing heat, and enters the power station steam-water system to further work. The process not only avoids the problem of low energy efficiency caused by the temperature drop and then the temperature rise of the flue gas in the wet acid-making process, but also reduces the processing cost of the subsequent sulfuric acid, so that the whole process is simple and the energy utilization efficiency is high.
[0018] The preferred embodiments of the utility model are described above, and it should be pointed out that for those skilled in the art, without departing from the overall concept of the utility model, some changes and improvements can be made, which should be regarded as the protection range of the utility model.
Claims
1. A coupled system for wet acid production and power plant flue gas desulfurization, characterized in that: Includes a boiler economizer (1) connected to the boiler, the boiler economizer (1) connected to a dust and nitrogen integrated equipment (2), the output end of the dust and nitrogen integrated equipment (2) connected to the reactor inlet flue (101), the reactor inlet flue (101) connected to the reactor (3), the output end of the reactor (3) connected to the reactor outlet flue (102), the reactor outlet flue (102) connected to the heat exchanger (4), the output end of the heat exchanger (4) connected to the heat exchanger outlet flue (103), the heat exchanger outlet flue (104) connected to the heat exchanger outlet flue (105), and the heat exchanger outlet flue (106) connected to the reactor outlet flue (107). The other end of 03) is connected to the condenser (5). The liquid outlet of the condenser (5) is connected to the sulfuric acid treatment unit. The gas outlet of the condenser (5) is connected to the condenser outlet flue (104). The condenser outlet flue (104) is connected to the wet electrostatic precipitator (6). The outlet of the wet electrostatic precipitator (6) is connected to the induced draft fan inlet flue (105). The induced draft fan inlet flue (105) is connected to the air inlet of the induced draft fan (7). The outlet of the induced draft fan (7) is connected to the chimney (8) through the chimney inlet flue (106).
2. The wet acid production and power plant flue gas desulfurization coupling system according to claim 1, characterized in that: The input end of the heat exchanger (4) is connected to the heat exchanger steam inlet pipe (107), and the output end of the heat exchanger (4) is connected to the heat exchanger steam outlet pipe (108).
3. The wet acid production and power plant flue gas desulfurization coupling system according to claim 2, characterized in that: A cooling fan (9) is installed on the condenser (5), and the condenser (5) is also connected to a cooling air outlet duct (109), the other end of which is connected to the boiler air system.