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CN-224212441-U - Flow equalizing device for outlet flue gas and raw flue gas of desulfurization wastewater drying tower

CN224212441UCN 224212441 UCN224212441 UCN 224212441UCN-224212441-U

Abstract

The utility model discloses a flow equalizer for outlet flue gas and raw flue gas of a desulfurization waste water drying tower, and relates to the technical field of zero discharge of desulfurization waste water of coal-fired units. The air preheater comprises an equalizing distribution pipe, equalizing distribution branch pipes, an air preheater and a drying tower, wherein the equalizing distribution pipe is positioned in an air preheater outlet flue of the air preheater, a plurality of equalizing distribution branch pipes are arranged on the equalizing distribution pipe at intervals, the air preheater outlet flue is connected with a plurality of air preheater outlet flue branch pipes, and the drying tower outlet flue of the drying tower is inserted into the air preheater outlet flue and is connected with the right end of the equalizing distribution pipe. The utility model can effectively reduce the amount of flue engineering in the conventional scheme, avoid the pollution and blockage of the heat exchange tube of the low-temperature economizer at the inlet of the dust remover caused by uneven split of wet flue gas of the desulfurization waste water, improve the utilization effect of flue gas waste heat and improve the economy of a unit.

Inventors

  • HAN LIANG
  • LI QINGHE
  • LIU FANGQI
  • LI XIN
  • CHEN QI
  • WANG WEI
  • DENG HAIWEN

Assignees

  • 中国电力工程顾问集团中南电力设计院有限公司

Dates

Publication Date
20260508
Application Date
20250521

Claims (10)

  1. 1. The flow equalizing device for the outlet flue gas and the raw flue gas of the desulfurization waste water drying tower is characterized by comprising a flow equalizing distribution pipe (110), flow equalizing distribution branch pipes (120), an air preheater (200) and a drying tower (300), wherein the flow equalizing distribution pipe (110) is positioned in an outlet flue (210) of the air preheater (200), the pipe diameter of the flow equalizing distribution pipe (110) is gradually reduced from right to left, and a plurality of flow equalizing distribution branch pipes (120) are arranged on the flow equalizing distribution pipe (110) at intervals; The air preheater outlet flues (210) are connected with a plurality of air preheater outlet flue branch pipes (220), and the flow equalizing distribution branch pipes (120) are in one-to-one correspondence with the air preheater outlet flue branch pipes (220); And a drying tower outlet flue (310) of the drying tower (300) is inserted into the air preheater outlet flue (210) and is connected with the right end of the flow equalizing distribution pipe (110).
  2. 2. The flow equalization device for flue gas and raw flue gas at the outlet of a desulfurization wastewater drying tower according to claim 1, wherein the flow equalization distribution pipe (110) is inclined from right to left, and the gradient is not less than 0.003.
  3. 3. The flow equalization device for flue gas and raw flue gas at the outlet of a desulfurization wastewater drying tower according to claim 2, wherein the flow equalization distribution pipe (110) comprises a plurality of steel pipes (111) which are sequentially connected from right to left and gradually reduced in pipe diameter, and the steel pipes (111) are connected with flow equalization distribution branch pipes (120).
  4. 4. The flow equalizing device for the flue gas and the raw flue gas at the outlet of the desulfurization wastewater drying tower according to claim 3 is characterized in that adjacent steel pipes (111) are connected through big-small heads (112), the leftmost steel pipe (111) is connected with an elbow (113), the big-small heads (112) adopt eccentric big-small heads, and the bottoms of the big-small heads (112) are flush.
  5. 5. The flow equalizer for flue gas and raw flue gas at the outlet of the desulfurization waste water drying tower according to claim 1, wherein the top windward side of the flow equalizing distribution pipe (110) is provided with wear-resistant angle steel (130).
  6. 6. The flow equalizer for flue gas and raw flue gas at the outlet of the desulfurization wastewater drying tower according to claim 4, further comprising an interface device (400), wherein the left end of the interface device (400) is connected with a steel pipe (111) at the rightmost end, and the right end of the interface device is sleeved with an outlet flue (310) of the drying tower.
  7. 7. The flow equalizer for flue gas and raw flue gas at the outlet of the desulfurization wastewater drying tower according to claim 6, wherein the inner diameter of the interface device (400) is 10mm larger than the outer diameter of the flue gas at the outlet of the drying tower (310), a plurality of circles of sealing teeth (410) are arranged in the interface device (400), and the height of the sealing teeth (410) is 3mm.
  8. 8. The desulfurization wastewater drying tower outlet flue gas and raw flue gas flow equalization apparatus as set forth in claim 6, wherein the drying tower outlet flue (310) is inserted 200mm into the air preheater outlet flue (210).
  9. 9. The flow equalizer for flue gas and raw flue gas at the outlet of the desulfurization waste water drying tower according to claim 7, wherein an expansion gap (420) is reserved between the interface device (400) and a wall plate (213) of the outlet flue (210) of the air preheater.
  10. 10. The desulfurization waste water drying tower outlet flue gas and raw flue gas flow equalizing device according to claim 1, further comprising a fixing support (510) and a guide support (520), wherein the fixing support (510) and the guide support (520) are of pipe clamping structures, the fixing support (510) is arranged at the middle position of the flow equalizing distribution pipe (110), the guide support (520) is arranged at two ends of the flow equalizing distribution pipe (110), and the fixing support (510) and the guide support (520) root on an inner supporting rod (211) or a diagonal brace (212) of an air preheater outlet flue (210).

Description

Flow equalizing device for outlet flue gas and raw flue gas of desulfurization wastewater drying tower Technical Field The utility model relates to the technical field of zero emission of desulfurization waste water of coal-fired units, in particular to a device suitable for mixing and equalizing flue gas at an outlet of a desulfurization waste water drying tower of a coal-fired unit with raw flue gas of a boiler. Background The coal-fired unit is a large household for industrial wastewater production, wherein desulfurization wastewater occupies a large proportion of the industrial wastewater of the coal-fired unit, the national requirements for wastewater discharge of the coal-fired unit are higher along with increasingly strict environmental requirements, the development and application of a high-quality development action plan (2022-2025 years) for environmental protection equipment manufacturing industry are clearly promoted, and the development and application of a desulfurization wastewater zero-discharge technology of the coal-fired power plant are listed as important development directions, and the pollution control feasible technical guidelines of the thermal power plant indicate that the core of realizing near-zero wastewater discharge of the thermal power plant is the realization of zero wastewater discharge of the desulfurization wastewater, and the environmental protection policy in part places more clearly requires that the coal-fired unit must synchronously construct a desulfurization wastewater zero-discharge device. Under the driving of the policy, the zero discharge technology of the desulfurization waste water is a complete discharge, wherein the 'concentration and drying' technical route becomes a main flow technical scheme which is applied to a large number of coal-fired units, the concentration schemes are various, the aim is to improve the concentration of the waste water and reduce the drying treatment capacity of the waste water, wherein the drying scheme is basically realized by adopting a desulfurization waste water drying tower scheme, high-temperature flue gas at the inlet of an air preheater is extracted or high-temperature air is extracted from hot secondary air to enter the drying tower, the high-temperature flue gas is mixed with concentrated desulfurization waste water sprayed into the drying tower for drying, and the mixed gas is sent into an outlet flue of the air preheater and is sent into smoke purification equipment such as a follow-up dust remover together with the raw flue gas of a boiler, so that the zero discharge of the desulfurization waste water is realized. The flue gas at the outlet of the conventional desulfurization waste water drying tower is connected into the original flue of the boiler by adopting two schemes, wherein one scheme is that the flue gas at the outlet of the drying tower is distributed into a plurality of branch pipes at the inlet of the dust remover through a pipeline, and the other scheme is that a single main pipe (a single-row air preheater unit) or two main pipes (a double-row air preheater unit) are connected into the flue gas at the outlet of the air preheater of the boiler; the two schemes are applied to coal-fired units, the drying tower outlet flue of the former scheme is longer, the arrangement space is tense, a compensator is also needed to be arranged on a pipeline to avoid overlarge thermal displacement of the pipeline, the scheme has larger pipeline engineering quantity and higher manufacturing cost, the drying tower outlet flue of the latter scheme is directly connected to the air preheater outlet flue, the pipeline is shorter, a certain pipeline engineering quantity can be saved, but due to wider section of the air preheater outlet flue, the drying tower outlet flue is inserted into the air preheater outlet flue, most of desulfurization waste water wet flue gas with higher relative humidity flows into one or two flue branch pipes close to the interface of the drying tower, so that the humidity of the flue gas in the branch pipes is increased, when the unit is provided with the low-temperature economizer at the inlet of the dust remover, the condensed wet flue gas with larger relative humidity is condensed after being cooled, small liquid drops and dust in the flue gas adhere to the heat exchange pipes of the low-temperature economizer, so that the low-temperature economizer is blocked, the heat exchange effect of the low-temperature economizer is affected, and the economical contamination of the unit is further affected. Therefore, under the premise of reducing the engineering quantity of the flue of the desulfurization waste water drying tower, the uniform distribution of wet flue gas of desulfurization waste water entering each branch pipe of the outlet flue of the air preheater is ensured, the pollution and blockage problems of the low-temperature economizer are avoided, and a flow equalizing device for improving the econo