CN-224212438-U - Desulfurization wastewater zero-discharge system utilizing flue gas to directly spray and concentrate

CN224212438UCN 224212438 UCN224212438 UCN 224212438UCN-224212438-U

Abstract

The utility model relates to the technical field of environmental protection equipment, and provides a desulfurization wastewater zero-emission system utilizing flue gas to directly spray and concentrate, which comprises a boiler, an evaporation flue, a desulfurization tower, a sedimentation unit and a tail water treatment unit; the evaporation flue is internally provided with a sprayer which is communicated with the desulfurization tower through a water inlet pipe and used for spraying desulfurization wastewater in the desulfurization tower into the evaporation flue for concentration, the evaporation flue is provided with a first circulating pipe, a first pump body is arranged on the first circulating pipe, and the first pump body is used for spraying desulfurization wastewater and sediment at the bottom of the evaporation flue into the evaporation flue again for concentration. The desulfurization waste water is circularly sprayed in the evaporation flue through the special evaporation flue, so that the evaporation rate is improved, the treatment capacity of the desulfurization waste water is improved, and meanwhile, the problem of blockage caused by accumulation of solids such as crystals, salts and the like in the evaporation flue can be solved.

Inventors

XIE CHAOJIAN
SU JUN
LI WEIJUN
QIU HANGPING
Lai Tailong
YAO GUODONG
Wan Xiupeng

Assignees

广州市天赐三和环保工程有限公司

Dates

Publication Date: 20260508
Application Date: 20250414

Claims (10)

1. A desulfurization wastewater zero-emission system utilizing flue gas to directly spray and concentrate is characterized by comprising a boiler, an evaporation flue, a desulfurization tower, a sedimentation unit and a tail water treatment unit, wherein the boiler, the evaporation flue and the desulfurization tower are sequentially communicated through a main flue; The evaporator flue is internally provided with a sprayer which is communicated with the desulfurizing tower through a water inlet pipe and is used for spraying desulfurization wastewater in the desulfurizing tower into the evaporator flue for concentration; The evaporation flue is provided with a first circulating pipe, a first pump body is arranged on the first circulating pipe, one end of the first circulating pipe is connected to the bottom of the evaporation flue, the other end of the first circulating pipe is communicated with the sprayer, and the first pump body is used for spraying desulfurization wastewater and sediment at the bottom of the evaporation flue into the evaporation flue again for concentration; The sedimentation unit is communicated with the evaporation flue through a blow-down pipe, and the blow-down pipe is used for conveying high-salt wastewater generated after the desulfurization wastewater in the evaporation flue is concentrated to the sedimentation unit; And a water outlet pipe communicated with the tail water treatment unit is arranged above the sedimentation unit, and a sewage return pipe communicated with the water inlet pipe is arranged below the sedimentation unit.
2. The zero-emission system for desulfurization wastewater by direct flue gas spraying and concentrating according to claim 1 is characterized in that a second circulating pipe is further arranged on the evaporation flue, a second pump body is arranged on the second circulating pipe, one end of the second circulating pipe is connected to the bottom of the evaporation flue, the other end of the second circulating pipe is communicated with the sprayer, and the second pump body is used for spraying desulfurization wastewater at the bottom of the evaporation flue into the evaporation flue again for concentrating.
3. The zero-emission system for desulfurization wastewater by direct flue gas spray concentration according to claim 2, wherein the sprayer comprises a first spray pipe and a second spray pipe, wherein the first spray pipe is communicated with the first circulating pipe, and the second spray pipe is communicated with the second circulating pipe.
4. The desulfurization wastewater zero-emission system for direct flue gas spray concentration according to claim 3, wherein the first spray pipe is arranged below the flue gas duct and the second spray pipe is arranged above the flue gas duct.
5. The desulfurization wastewater zero-emission system utilizing direct flue gas spray concentration according to claim 2, wherein the bottom of the evaporation flue is gradually narrowed.
6. The zero-emission system for desulfurization wastewater by directly spraying and concentrating flue gas according to claim 5, wherein the evaporation flue is internally provided with an inverted V-shaped flow dividing block.
7. The zero-emission system for desulfurization wastewater by direct flue gas spray concentration according to claim 6, wherein the first circulation pipe and the second circulation pipe are provided on both sides of the split block.
8. The zero-emission system for desulfurization wastewater by direct flue gas spray concentration according to claim 1, wherein the tail water treatment unit comprises a water storage tank, a drying tower and a dust remover which are sequentially connected, and the water storage tank is communicated with the sedimentation unit through the water outlet pipe.
9. The zero-emission system for desulfurization wastewater by directly spraying and concentrating flue gas according to claim 1, wherein the sedimentation unit comprises a lime milk tank and a clarifying tank, the clarifying tank is communicated with the lime milk tank through a feeding pipeline, the input end of the clarifying tank is communicated with the evaporation flue through a blow-down pipe, the water outlet pipe is arranged above the clarifying tank, and the sewage return pipe is arranged below the clarifying tank.
10. The zero-emission system for desulfurization wastewater by direct flue gas spray concentration according to claim 1, further comprising a vacuum belt dehydrator, wherein the vacuum belt dehydrator is arranged at a conveying path of the water inlet pipe.

Description

Desulfurization wastewater zero-discharge system utilizing flue gas to directly spray and concentrate Technical Field The utility model relates to the technical field of environmental protection equipment, in particular to a desulfurization wastewater zero-discharge system utilizing flue gas to directly spray and concentrate. Background In the power generation industry, coal-fired power generation still occupies most part, and the wet flue gas desulfurization technology becomes the main flow process of flue gas desulfurization of coal-fired power plants in China due to the advantages of higher desulfurization efficiency, high reaction speed, high desulfurizing agent utilization rate and the like. The desulfurization waste water at the terminal of the coal-fired power plant has high floats, high salt content, high hardness and strong corrosiveness, and is difficult to directly recycle, so how to treat the desulfurization waste water becomes a serious issue. The flue evaporation technology is to spray the waste water into a flue between an air preheater and a dust remover, and completely evaporate the waste water by using hot flue gas, wherein pollutants in the waste water are converted into solids such as crystals or salts, but if the desulfurization waste water is completely evaporated by a main flue, the purpose of complete evaporation may not be achieved. CN113185045A discloses a device for evaporating zero discharge flue of desulfurization wastewater and cooperatively removing SO3/HCl, which comprises an SCR denitration reactor, an air preheater, a dust remover and a desulfurizing tower which are sequentially connected with a main flue, and further comprises a rotary atomization drying tower, a three-header, a stirring pool, a wastewater lifting pump, a high-level feed box, a spraying device and a salt recovery treatment system. The above patent adopts both main flue evaporation and bypass spray drying evaporation, thereby making up the incomplete problem of main flue evaporation. However, although the system can effectively reduce the generation amount of desulfurization wastewater, the equipment investment of the system is huge, the process flow is very lengthy, and the problems of main flue blockage and sprayer blockage still exist. Based on the above, the technical problem solved by the scheme is how to solve the problem of insufficient evaporation treatment capacity of the main flue. Disclosure of utility model In order to solve the technical problems, the utility model provides a desulfurization wastewater zero-emission system which utilizes flue gas to directly spray and concentrate, and the desulfurization wastewater is circularly sprayed in an evaporation flue through a special evaporation flue, so that the evaporation rate is improved, the treatment capacity of the desulfurization wastewater is improved, and meanwhile, the problem of blockage caused by accumulation of solids such as crystals, salts and the like in the evaporation flue can be solved. The technical scheme of the system is as follows: A desulfurization wastewater zero-emission system utilizing flue gas to directly spray and concentrate comprises a boiler, an evaporation flue, a desulfurization tower, a sedimentation unit and a tail water treatment unit, wherein the boiler, the evaporation flue and the desulfurization tower are sequentially communicated through a main flue; The evaporator flue is internally provided with a sprayer which is communicated with the desulfurizing tower through a water inlet pipe and is used for spraying desulfurization wastewater in the desulfurizing tower into the evaporator flue for concentration; The evaporation flue is provided with a first circulating pipe, a first pump body is arranged on the first circulating pipe, one end of the first circulating pipe is connected to the bottom of the evaporation flue, the other end of the first circulating pipe is communicated with the sprayer, and the first pump body is used for spraying desulfurization wastewater and sediment at the bottom of the evaporation flue into the evaporation flue again for concentration; The sedimentation unit is communicated with the evaporation flue through a blow-down pipe, and the blow-down pipe is used for conveying high-salt wastewater generated after the desulfurization wastewater in the evaporation flue is concentrated to the sedimentation unit; And a water outlet pipe communicated with the tail water treatment unit is arranged above the sedimentation unit, and a sewage return pipe communicated with the water inlet pipe is arranged below the sedimentation unit. In the desulfurization wastewater zero-emission system utilizing flue gas to directly spray and concentrate, the evaporation flue is further provided with a second circulating pipe, a second pump body is arranged on the second circulating pipe, one end of the second circulating pipe is connected to the bottom of the evaporation flue, the other end of the second circula