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      Waste heat recovery technology for direct heat exchange of blast furnace slag flushing water

      • Overview
      • characteristic
      • Performance
      • Atlas
      • +

      The blast furnace ironmaking slag produces a large amount of slag washing water at 60 ~ 95 ℃ after water quenching, which contains a huge amount of heat, but it contains a large amount of solid particles and mineral fibers, and is corrosive. It is difficult to use its heat. Many iron and steel enterprises have tried to use the residual heat of the flushing slag water for heating, but they have not yet been fully and effectively used, especially in large blast furnaces.

      Tianjin Huasaier's 6 years of repeated research and experiments have achieved breakthrough results, developed a global original (see the table below for the details of patent names and patent numbers), the world's leading (2015, IPEEC international "top ten energy-saving technologies"). Non-filtering "Blast Furnace Slag Washing Water Direct Heat Exchange Residual Heat Recovery Technology". This technology does not have a sedimentation filtering device and directly enters the "slag washing heat exchanger" for heat exchange with heating water. The technical advantage lies in the total water volume. Heat extraction and heat recovery are large, the process is simple, and it is easy to operate. It can realize unattended operation. It is seamlessly connected with the blast furnace slag flushing system and does not interfere with the blast furnace operation. It is suitable for various water slag flushing processes. It occupies a small area and is easy to implement; it only takes heat and no secondary pollution; it has low operating costs and low maintenance.

      The non-filtering "slag water direct heat exchange waste heat recovery technology" developed by Wasser was listed by the National Development and Reform Commission as the "National Key Energy-Saving and Low-Carbon Technology Promotion Catalogue" for four consecutive years in 2014, 2015, 2016, and 2017, and In May 2015, the National Development and Reform Commission's Environment and Resources Department organized the review and selection of China's "Top Ten Energy-Saving Technologies and Top 10 Energy-Saving Practices" projects, and participated in the selection of the top 10 energy-saving technologies and ten energy-saving practices by the International Energy Efficiency Partnership (IPEEC) , And was eventually selected as one of the top ten energy-saving technologies in the world. "Blast furnace slag flushing water direct heat exchange waste heat recovery technology" has obtained 16 national patents, including 8 invention patents, and won the Tianjin Patent Gold Award.

      Announcement of 2014 "National Key Energy-saving and Low-carbon Technology Promotion Catalogue" NDRC 2014 No. 24

      http://www.ndrc.gov.cn/zcfb/zcfbgg/201501/t20150114_660123.html

      发改委 2015 35 Announcement of the 2015 National Catalogue of Promotion of Key Energy-Saving and Low-Carbon Technologies NDRC 2015 No. 35

      http://www.ndrc.gov.cn/zcfb/zcfbgg/201601/t20160106_770659.html

      发改委 2016 30 Announcement of the 2016 National Catalogue of Promotion of Key Energy-Saving and Low-Carbon Technologies NDRC 2016 No. 30

      http://www.ndrc.gov.cn/zcfb/zcfbgg/201701/t20170119_835577.html

      发改委 2018 3 2017 `` National Key Energy-Saving and Low-Carbon Technology Promotion Catalogue '' Announcement NDRC 2018 No. 3

      http://www.ndrc.gov.cn/zcfb/zcfbgg/201802/t20180212_877383.html

      IPEEC )十大节能技术和十大节能实践评选,并最终入选国际“十大节能技术”。 In May 2015, the Environmental Development Department of the National Development and Reform Commission organized the review and selection of China's "Top Ten Energy-Saving Technologies and Ten Energy-Saving Practices" projects, and participated in the selection of the Ten Energy-Saving Technologies and Ten Energy-Saving Practices by the International Energy Efficiency Partnership ( IPEEC ) And finally selected into the international "top ten energy-saving technologies."

      发改委 2015 32 Announcement of the 2015 International and Chinese "Double Ten Best" NDRC 2015 No. 32

      http://www.ndrc.gov.cn/zcfb/zcfbgg/201601/t20160106_770635.html

      Typical examples of slag water heat exchanger applications:

      TISCO Group project: Since 2013, TISCO 3 # 5 # 6 # blast furnace slag water waste heat recovery and utilization have been implemented successively. All three iron-making blast furnaces have realized nearly 7 million square meters of urban buildings in Taiyuan to replace coal-fired centralized heating. Banned 350 coal-fired boilers.

      Qianxi County Project of Tangshan City: In 2014, 12 blast furnace slag flushing water from Jinxi Iron and Steel and Wantong Iron and Steel used this project technology to implement waste heat recovery and utilization to provide centralized heating for cities and towns in Qianxi County. Qianxi County's coal-fired coal-fired boiler has realized the idea of centralizing low-grade industrial waste heat in Qianxi County, generating a warm response in Beijing, Tianjin, Hebei and surrounding areas. CCTV reported on this successful application on March 20, 2015 .

      Serial number

      patent name

      Patent No

      Certificate Number

      Authorization announcement date

      1

      Heat transfer plate for multi-pass staggered flow welding plate heat exchanger

      ZL201320059424.6

      3133459

      2013.08.28

      2

      Blast furnace slag flushing water heat exchanger

      ZL201320097656.0

      3133773

      2013.08.28

      3

      Multi-process heat exchanger for blast furnace slag flushing water

      ZL201310067758.2

      1444707

      2014.07.16

      4

      Multi-process heat exchanger for blast furnace slag flushing water

      ZL201310067879.7

      1506697

      2014.10.29

      5

      Blast furnace slag flushing heat extraction process system

      ZL201310105198.5

      2088449

      2016.05.25

      6

      Blast furnace slag flushing heat extraction process system

      ZL201310106313.0

      2086939

      2016.05.25

      7

      Blast furnace slag flushing heat extraction process system

      ZL201310106312.6

      1905243

      2015.12.30

      8

      Blast furnace slag flushing heat extraction process system

      ZL201310106314.5

      2088478

      2016.05.25

      9

      Blast furnace slag flushing heat extraction process system

      ZL201310104924.1

      2087208

      2016.05.25

      10

      Blast furnace slag flushing heat extraction process system

      ZL201310104925.6

      1905686

      2016.01.20

      11

      Blast furnace slag flushing water heat exchanger

      ZL201420864730.1

      4426878

      2015.07.08

      12

      Multi-channel and multi-process blast furnace slag flushing water heat exchanger

      ZL201420865332.1

      4422690

      2015.07.08

      13

      Waste heat recovery system for blast furnace slag flushing water

      ZL201420864879.X

      4430027

      2015.07.08

      14

      Blast furnace slag flushing waste heat recovery slag flushing switching system

      ZL201420864724.6

      4425587

      2015.07.08

      15

      Anti-blocking heat extraction pipeline system

      ZL201620839877.4

      5973408

      2017.3.8

      16

      Low-temperature waste heat recovery heating system

      ZL201621085296.2

      6332170

      2017.8.29


      特点.png


      Serial number

      client's name

      Number of blast furnaces

      Blast furnace volume

      Slag washing process

      time

      1

      TISCO Group

      3

      1800 ~ 4350

      Jiaheng, Inba

      2013

      2

      Sky Rail Group

      2

      750

      Bottom filter

      2013

      3

      Anyang Iron and Steel Group

      1

      2200

      Reinba

      2013

      4

      Jinxi Steel Works, Wantong Steel Works

      12

      450 ~ 800

      Advection sedimentation

      2014

      5

      ZTE Shanxi

      1

      230

      Advection sedimentation

      2014

      6

      Chifeng Gold Sword Copper

      1


      Advection sedimentation

      2014

      7

      Anshan Iron and Steel Group

      2

      2580

      Jiaheng

      2015

      8

      Bengang Group

      1

      2850

      Imba

      2016

      9

      Sunshine metallurgy

      1

      450

      Advection sedimentation

      2016

      10

      Guofeng Steel

      2

      1780

      Jiaheng

      2016

      11

      Yongyang Steel

      1

      1260

      Jiaheng

      2016

      12

      Jinan Meide

      1


      Advection sedimentation

      2016

      13

      Jianlong, Shanxi

      5

      750

      Bottom filter

      2017

      14

      Puyang Iron and Steel

      4

      800

      Jiaheng, advection precipitation

      2017

      15

      Zibo Longsheng

      2

      630, 720

      Advection sedimentation

      2017

      16

      Ganglu Iron and Steel

      6

      650 ~ 1080

      Minter, bottom filter

      2017

      17

      Tianjin Steel Pipe Group

      1

      1080

      Bottom filter

      2017

      18

      Guoyi Steel

      4

      450 ~ 660

      Advection sedimentation

      2017

      19

      Tangshan Donghai Iron & Steel

      4

      450 ~ 1080

      Advection sedimentation

      2017

      20

      Tangshan Shandong Special Steel

      7

      1080 ~ 1350

      Jiaheng, bottom filter

      2017

      twenty one

      Tang Steel Stainless

      4

      450 ~ 550

      Jiaheng

      2017

      twenty two

      Tangshan Xinbaotai

      4

      450 ~ 1080

      Bottom filter

      2017

      twenty three

      Golden autumn casting

      1

      200

      Advection sedimentation

      2017

      "Blast furnace slag water direct heat exchange waste heat recovery technology" successfully implemented nearly 70 blast furnace slag water waste heat recovery projects for heating, including one copper smelting furnace, two 4350 cubic meters of large ironmaking blast furnace, total heating area It reaches 32 million square meters. Its technology is mature, reliable and has a wide range of applications. It can be widely used in urban centralized heating over a long distance, and it can also be used for heating and domestic hot water supply in the plant area on a small scale. It can also be used in metallurgical industries such as iron and copper smelting, and has broad application prospects. It has opened an effective way for the waste heat recovery of the blast furnace slag water of iron and steel enterprises, and it has also opened up an effective environmental protection heat source for the heating of urban buildings around steel enterprises.


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