Integrated device for wet-process acidification denitration and acid mist control

Abstract

The utility model provides an integrated device for wet-process acidification denitration and acid mist control. The integrated device for wet-process acid-making denitration and acid mist control comprises a storage tank, a mixer and a combustor which are sequentially connected through pipelines, a denitration agent and silicone oil are stored in the storage tank, and the combustor is connected with a pipeline at the rear end of a sulfur dioxide conversion tower through a pipeline. According to the integrated device for wet-process acid-making denitration and acid mist control, the problem that in the existing wet-process acid-making process, denitration and acid mist control need two sets of equipment for independent treatment is solved.

Description

Technical Field

[0001] The utility model relates to the field of wet acid production, and in particular to an integrated device for wet acid production, denitration and acid mist control. Background Art

[0002] Currently, sulfur recovery primarily relies on wet acid production processes, both domestically and internationally. In wet acid production, process gas denitrification typically utilizes the SCR process (selective catalytic reduction). This involves installing a catalytic denitrification unit before the SO2 conversion tower. Liquid ammonia, a reducing agent, is added to the process gas, reducing nitrogen oxides in the flue gas to nitrogen and water under the action of the catalyst, thereby removing nitrogen oxides. While SCR denitrification offers high denitrification efficiency, the catalysts used are highly imported, expensive, and require a short replacement cycle. The storage, transportation, and gasification of the accompanying liquid ammonia require specialized equipment and safety measures, resulting in high construction and operating costs. Industries other than wet acid production that require flue gas denitrification often utilize polymer denitrification processes. Polymer denitrification involves adding a polymer denitrification reducing agent directly to the flue gas at an appropriate temperature. The ammonia released by the thermal decomposition of the reducing agent, along with trace catalytic elements and reaction aids, reduces nitrogen oxides in the flue gas to nitrogen and water, thereby removing nitrogen oxides. Polymer denitrification is more efficient than the SCR denitrification process, and its construction and operating costs are much lower. Currently, a variety of polymer denitrification reducing agents suitable for high, medium, and low temperatures have been developed in China.

[0003] At the same time, during the wet acid production process, the high-temperature SO3 from the SO2 conversion tower combines with water vapor to enter the condenser in the form of gaseous sulfuric acid. In the condenser, the gaseous sulfuric acid is cooled to below the dew point temperature and condensed into liquid sulfuric acid. However, a small amount of gaseous sulfuric acid cannot be completely condensed into liquid sulfuric acid and is discharged as sulfuric acid mist with the system process exhaust, which can easily cause corrosion of equipment and pipelines and environmental pollution. In order to improve the conversion rate of gaseous sulfuric acid to liquid sulfuric acid and reduce the emission of sulfuric acid mist, SiO2 particles are generally added to the gaseous sulfuric acid before the condenser during the wet acid production process as crystal nuclei to improve the condensation effect and reduce the generation of sulfuric acid mist. Utility Model Content

[0004] In order to solve the problem that denitration and acid mist control require two sets of equipment to handle separately in the current wet acid production process, the utility model provides an integrated device for denitration and acid mist control in wet acid production.

[0005] An integrated device for wet acid denitration and acid mist control comprises a storage tank, a mixer and a burner connected in sequence by pipelines. The storage tank contains a denitrifier and silicone oil, and the burner pipeline is connected to the rear end pipeline of a sulfur dioxide conversion tower.

[0006] In a preferred embodiment of the integrated device for wet acid production, denitrification and acid mist control provided by the present invention, the storage tank includes a first storage tank containing a denitrification agent and a second storage tank containing silicone oil, and the two are respectively connected to the mixer by pipelines.

[0007] In a preferred embodiment of the integrated device for wet acid production, denitrification, and acid mist control provided by the present invention, the device further includes a compressed air source, the compressed air source pipeline of which is connected to the pipeline at the rear end of the storage tank and the pipeline at the rear end of the mixer. The device further includes a combustion-supporting gas source, the pipeline of which is connected to the burner. The device further includes a cooling air source, the pipeline of which is connected to the pipeline at the rear end of the burner.

[0008] In a preferred embodiment of the integrated device for wet acid production, denitrification, and acid mist control provided by the present invention, a regulator is further included. The regulator includes a first detection end located in the pipeline at the rear end of the condenser and a first regulating end located in the pipeline at the front end of the mixer. The regulator also includes a second detection end located in the pipeline at the rear end of the burner and a second regulating end located in the pipeline at the rear end of the combustion-supporting gas source. The regulator also includes a third detection end located in the pipeline at the rear end of the burner and a third regulating end located in the pipeline at the rear end of the cooling gas source.

[0009] Compared with the existing technology, the integrated device for wet acid production, denitrification and acid mist control provided by the utility model has the following beneficial effects:

[0010] 1. This device adopts polymer denitrification to replace the SCR denitrification process commonly used in the wet acid production process. The construction cost and subsequent operating cost of polymer denitrification are much lower than those of the SCR denitrification process, which can achieve good economic benefits.

[0011] 2. This device uses organic silicone oil to decompose under heat to form SiO2 particles, which serve as crystal nuclei for gaseous sulfuric acid to cool into liquid sulfuric acid, accelerate condensation and liquefaction, and reduce the generation of sulfuric acid mist.

[0012] 3. This device integrates the two independent devices of process gas denitrification and acid mist control in the wet acid production process into one integrated device, which has a higher degree of automation, simpler operation, more guaranteed denitrification and acid mist control effects, and good environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of an integrated device for wet acid production, denitrification and acid mist control.

[0014] Numbers in the figure: first storage tank 11, second storage tank 12, mixer 13, burner 14, compressed gas source 21, combustion-supporting gas source 22, cooling gas source 23, regulator 3, first detection end 311, first regulating end 312, second detection end 321, second regulating end 322, third detection end 331, third regulating end 332, sulfur dioxide conversion tower 4, condenser 5. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] See also Figure 1 , is a structural schematic diagram of an integrated device for wet acid production, denitrification and acid mist control provided by the utility model.

[0017] The integrated device for wet acid denitrification and acid mist control includes a first storage tank 11, a second storage tank 12, a mixer 13, a burner 14, a compressed air source 21, a combustion-supporting gas source 22, a cooling air source 23, and a regulator 3. To facilitate the presentation of the solution, the sulfur dioxide conversion tower 4 and condenser 5 from the wet acid production process are also introduced.

[0018] The first storage tank 11 stores a polymer denitrifier, and the second storage tank 12 stores silicone oil. Discharge pipes are provided at the bottom of both tanks, connected to a mixer 13. The mixer 13 is a spiral solid-liquid mixer, with the top connecting the discharge pipes of the first and second storage tanks 11, 12, and the bottom providing a mixing discharge pipe connected to a burner 14. The bottom of the burner 14 is a burner head, with a heating chamber located above. The mixing discharge pipe of the mixer 13 is connected to the lower portion of the heating chamber, while a mixed gas pipe is provided at the upper portion of the heating chamber, connected to the rear-end pipeline of the sulfur dioxide conversion tower 4.

[0019] The compressed gas source 21 is provided with a compressed gas source pipe, which is divided into two branches. One branch is connected to the two discharge pipes near the first storage tank 11 or the second storage tank 12, and the other branch is connected to the mixed discharge pipe near the mixer 13. The combustion-supporting gas source 22 is provided with a combustion-supporting gas source pipe connected to the burner of the burner 14. The cooling gas source 23 is provided with a cooling gas source pipe connected to the mixed gas pipe.

[0020] Regulator 3 includes:

[0021] A first detection end 311 is provided on the rear end pipe of the condenser 5, and a first adjustment end 312 is provided on one end of the two unloading pipes close to the mixer 13; a second detection end 321 is provided in the heating chamber of the burner 14, and a second adjustment end 322 is provided on the combustion-supporting gas source pipe; a third detection end 331 is provided on the mixed gas pipe downstream of the cooling gas source pipe, and a third adjustment end 332 is provided on the cooling gas source pipe.

[0022] The operating principle of the integrated device for wet acid denitrification and acid mist control is as follows:

[0023] The polymer denitrifier in the first storage tank 11 and the silicone oil in the second storage tank 12, powered by compressed air source 21, enter the mixer 13 through a discharge pipe. Mixer 13 thoroughly mixes the polymer denitrifier and silicone oil, which then enter the heating chamber of the burner 14 through a mixing discharge pipe, also powered by compressed air source 21.

[0024] In the heating chamber, the polymer denitrifier is decomposed by heat to release ammonia, catalytic elements and reaction aids, and the silicone oil is decomposed by heat to produce SiO2 particles, forming a mixed gas, which is transported through the mixed gas pipe to the rear end pipeline of the sulfur dioxide conversion tower 4 under the action of pressure difference.

[0025] The ammonia in the mixed gas reacts with the nitrogen oxides in the process gas. Under the combined action of the catalytic elements and reaction aids, the nitrogen oxides are reduced to nitrogen and water, and the nitrogen oxides in the process gas are removed. The SiO2 particles in the mixed gas become crystal nuclei for the gaseous sulfuric acid to cool into liquid sulfuric acid, accelerating the condensation and liquefaction of the gaseous sulfuric acid and reducing the generation of sulfuric acid mist.

[0026] The operating principle of regulator 3 is as follows:

[0027] The first detection terminal 311 determines the amount of polymer denitrifier and silicone oil required for thermal decomposition based on the nitrogen oxide and sulfuric acid mist content in the process exhaust. The first regulation terminal 312 is equipped with a flowmeter and a flow control valve. Based on this quantitative information and the flowmeter readings, the flow control valve is controlled to adjust the supply of polymer denitrifier and silicone oil to the appropriate level.

[0028] The second detection terminal 321 reads the temperature inside the heating chamber of the burner 14. The second regulating terminal 322 is equipped with a flow meter and a flow regulating valve. Based on the temperature and the flow meter reading, the amount of supporting gas supplied by the supporting gas source 22 is controlled to adjust the heating chamber to the appropriate temperature.

[0029] The third detection terminal 331 reads the temperature of the mixed gas in the mixed gas pipe. The third regulating terminal 332 is equipped with a flow meter and a flow regulating valve. Based on the temperature and the flow meter reading, the amount of cooling gas supplied by the cooling gas source 23 is controlled, thereby adjusting the mixed gas to the appropriate temperature.

[0030] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An integrated device for wet acid denitrification and acid mist control, characterized by: The invention comprises a storage tank, a mixer and a burner which are connected in sequence through pipelines. The storage tank contains denitrification agent and silicone oil, and the burner pipeline is connected to the rear end pipeline of the sulfur dioxide conversion tower.

2. The integrated device for wet acid denitrification and acid mist control according to claim 1, characterized in that: The storage tanks include a first storage tank storing a denitrifying agent and a second storage tank storing silicone oil, and the first and second storage tanks are connected to the mixer via pipelines.

3. The integrated device for wet acid production, denitrification and acid mist control according to claim 1 or 2, characterized in that: It also includes a compressed air source, wherein the compressed air source pipeline is connected to the rear end pipeline of the storage tank and the rear end pipeline of the mixer.

4. The integrated device for wet acid denitrification and acid mist control according to claim 3, characterized in that: It also includes a combustion-supporting gas source, and a pipeline is connected to the burner.

5. The integrated device for wet acid denitrification and acid mist control according to claim 4, characterized in that: It also includes a cooling air source, and a pipeline is connected to the rear end pipeline of the burner.

6. The integrated device for wet acid production, denitrification and acid mist control according to claim 5, characterized in that: The device further comprises a regulator, which comprises a first detection end arranged at the rear end pipeline of the condenser and a first regulating end arranged at the front end pipeline of the mixer.

7. The integrated device for wet acid production, denitrification and acid mist control according to claim 6, characterized in that: The regulator further includes a second detection end provided on the burner and a second regulating end provided on the rear end pipeline of the combustion-supporting gas source.

8. The integrated device for wet acid production, denitrification and acid mist control according to claim 7, characterized in that: The regulator further includes a third detection end provided at the rear end pipeline of the burner, and a third regulating end provided at the rear end pipeline of the cooling gas source.

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