Desulfurization, denitrification and dust removal ultralow emission process and system for production of cement from low-sulfur raw materials

A desulfurization, denitrification and emission system technology, which is applied in the field of ultra-low emission processes and systems for desulfurization, denitrification and dust removal, can solve the problems of low frequency of use, large investment costs, and reduced equipment efficiency, so as to reduce overall costs, improve efficiency, and avoid ammonia escape. Effect

Pending Publication Date: 2019-08-02
TIANJIN CEMENT IND DESIGN & RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] When producing cement from low-sulfur raw materials, low-sulfur here refers to SO in raw materials 3 When it is 0.1-0.5%, the flue gas emission is easy to exceed the standard when the grinding is stopped. At this time, if the semi-dry d

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  • Desulfurization, denitrification and dust removal ultralow emission process and system for production of cement from low-sulfur raw materials
  • Desulfurization, denitrification and dust removal ultralow emission process and system for production of cement from low-sulfur raw materials
  • Desulfurization, denitrification and dust removal ultralow emission process and system for production of cement from low-sulfur raw materials

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Embodiment 1

[0047] See Figure 1~3 The embodiment of the present invention provides an ultra-low emission process for desulfurization, denitrification, and dust removal for producing cement from low-sulfur raw materials, including the following steps:

[0048] S1. Cement clinker firing: low-sulfur raw materials are fed into the decomposition furnace 1-2 through heat exchange with the hot flue gas through the kiln tail preheater 1-1, and then calcined in the rotary kiln 2, and then enter the cooler 4 to cool the cement clinker. When the cement clinker is fired, the firing system performs self-denitration, SNCR, self-desulfurization and dry desulfurization in the calciner. The self-denitration and SNCR of the calciner make the NOx in the flue gas exiting the kiln tail preheater control Within the lowest NOx emission range where ammonia escapes, NOx can be controlled at 50-200mg / Nm 3 (@10%O 2 ), self-desulfurization and dry desulfurization make SO 2 Control within the emission range that does n...

Embodiment 2

[0075] See Figure 1~3 , A desulfurization, denitrification and dust removal ultra-low emission system for producing cement with low-sulfur raw materials using the above process, including a cement clinker burning system, which includes a kiln tail preheater 1-1 and a decomposition furnace 1-2 , Cement kiln 2 and cooler 4, also including kiln tail high temperature fan 13-1, grinding system 8, kiln tail dust collector 6-2, low temperature SCR denitrification reactor 9, wet desulfurization tower 10, kiln head dust collection The outlet of the kiln tail preheater C1 is connected to the inlet of the grinding system 8 through the kiln tail high temperature fan 13-1, and the outlet of the grinding system 8 is connected to the kiln tail dust collector 6-2. The outlet of the kiln tail dust collector 6-2 is connected to the inlet of the low temperature SCR denitrification reactor 9, the outlet of the low temperature SCR denitrification reactor 9 is connected to the inlet of the wet desu...

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Abstract

The invention discloses a desulfurization, denitrification and dust removal ultralow emission process and system for production of cement from low-sulfur raw materials. The process comprises the stepsas follows: firing of cement clinker, dust removal, flue gas blending, low-temperature SCR denitrification and wet desulfurization. The system comprises a cement clinker firing system, a kiln tail high-temperature fan, a grinding system, a kiln tail dust collector, a low-temperature SCR denitrification reactor, a wet desulfurization tower, a kiln head dust collector and a kiln head induced draftfan; a kiln tail preheater C1 gas outlet, the kiln tail high-temperature fan, the grinding system, the kiln tail dust collector, the low-temperature SCR denitrification reactor, the wet desulfurization tower, an exhaust fan and a kiln tail chimney are sequentially arranged; a cooler, a kiln head dust collector and the kiln head induced draft fan are sequentially connected; an outlet of the kiln head induced draft fan is connected with a gas outlet of the kiln tail dust collector. Dry desulfurization, SCR and wet desulfurization processes are adopted for production of cement from the low-sulfurraw materials, and desulfurization and denitrification ultralow emission during production of the cement from the low-sulfur raw materials is realized.

Description

Technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to an ultra-low emission process and system for desulfurization, denitrification and dust removal for producing cement from low-sulfur raw materials. Background technique [0002] The national environmental protection policy is becoming more and more stringent. The national standard GB4915-2013 "Cement Industry Air Pollutant Emission Standard" sets special restrictions on the emission of air pollutants from cement kilns and waste heat utilization systems in key areas as NO x 320mg / Nm 3 , SO 2 100mg / Nm 3 , Particulate matter 20mg / Nm 3 . The second generation cement technical standard released by the Building Materials Association requires NO x Emission is 100mg / Nm 3 , SO 2 Emission is 50mg / Nm 3 , Dust emission is 10mg / Nm 3 . Recently, some local governments have introduced stricter policies to limit unit emissions and total emissions NO x Emission is 50mg / Nm 3 , SO 2 Emission i...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/56B01D53/50B01D53/79B01D53/86B01D53/83B01D53/78F27D17/00C04B7/47C04B7/43
CPCB01D53/75B01D53/56B01D53/50B01D53/508B01D53/79B01D53/8625B01D53/83B01D53/78F27D17/004F27D17/008C04B7/432C04B7/475C04B7/364B01D2251/2062B01D2251/404B01D2258/0283
Inventor 马娇媚彭学平陈昌华胡芝娟赵亮武晓萍李波王伟高为民
Owner TIANJIN CEMENT IND DESIGN & RES INST
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