Organic silicon waste incineration waste gas treatment system capable of recycling hydrochloric acid solution

Abstract

The utility model discloses an organic silicon waste incineration waste gas treatment system capable of recycling a hydrochloric acid solution. The organic silicon waste incineration waste gas treatment system comprises a quenching dust removal unit, a hydrochloric acid recycling unit, a filter residue treatment unit and a tail gas treatment unit, the hydrochloric acid recovery is realized through the quenching dust removal unit and the hydrochloric acid recovery unit; ton bag treatment of filter residues (silicon dioxide) after filter pressing is achieved through the filter residue treatment unit, dust raising can be avoided, and meanwhile the storage occupied area is small; overflow of acid mist in the treatment process is avoided through the tail gas treatment unit, and zero-pollution emission of gas in the treatment process can be achieved; and up-to-standard discharge of the sewage is realized through backflow of the sewage pump.

Description

Technical Field

[0001] The utility model relates to the field of organic silicon waste incineration treatment, in particular to an organic silicon waste incineration waste gas treatment system capable of recovering hydrochloric acid solution. Background Art

[0002] In recent years, incineration has become a key method for treating waste in my country's organosilicon industry. The incineration of organosilicon waste produces a large amount of exhaust gas, which contains silica dust and hydrogen chloride gas. Direct discharge of this exhaust gas can cause environmental pollution. Some companies use simple dust removal equipment to remove the silica dust from the exhaust gas, then store it directly in ton bags, which consumes significant storage resources. Some even directly pile up the waste, causing dust. Therefore, the scientific treatment of the exhaust gas from organosilicon waste incineration has become a growing concern within the industry. Utility Model Content

[0003] The utility model aims to provide an organosilicon waste incineration waste gas treatment system capable of recovering hydrochloric acid solution.

[0004] The innovation of this utility model lies in: the application realizes the recovery of hydrochloric acid through the rapid cooling dust removal unit and the hydrochloric acid recovery unit; the filter residue treatment unit realizes the ton bag treatment of the filter residue (silicon dioxide) after pressure filtration, which can avoid dust and at the same time, the storage occupies a small area; the exhaust gas treatment unit avoids the overflow of acid mist during the treatment process, and can achieve zero pollution emission of gas during the treatment process; and the sewage pump refluxes multiple cycles and acid-base neutralization to achieve standard sewage discharge.

[0005] In order to achieve the above-mentioned utility model purpose, the technical solution of the utility model is:

[0006] A waste gas treatment system for incineration of organic silicon waste capable of recovering hydrochloric acid solution comprises a quenching dust removal unit, a hydrochloric acid recovery unit, a filter residue treatment unit and a tail gas treatment unit; the quenching dust removal unit comprises a quenching dust removal tower, a dust-containing acid storage tank, a dust-containing acid delivery pump and a first filter press connected in sequence; the hydrochloric acid recovery unit comprises a filtrate temporary storage tank, a filtrate delivery pump and a hydrochloric acid storage tank connected in sequence; the inlet of the filtrate temporary storage tank is connected to the filtrate outlet of the first filter press; the filter residue treatment unit comprises a neutralization tank, a second filter press, a sewage tank and a sewage pump connected in sequence; the inlet of the neutralization tank is connected to the filter residue outlet of the first filter press; the filter residue outlet of the second filter press is connected to a ton bag device; the tail gas treatment unit comprises an induced draft fan and an alkali washing tower connected to the induced draft fan; the other end of the induced draft fan is connected to the exhaust port of the neutralization tank.

[0007] Furthermore, the quenching dust removal tower is an upper and lower structure, including an upper graphite quenching section and a lower dust removal section. Both the graphite quenching section and the dust removal section are provided with spray units. The bottom of the dust removal section is a recovery chamber, and the recovery chamber is connected to the dust-containing acid storage tank through a pipeline. The other route of the filtrate delivery pump is connected to the spray unit of the quenching dust removal tower.

[0008] Furthermore, a pH value detector is provided in the neutralization tank; another route of the dust-containing acid delivery pump is connected to the neutralization tank; and another route of the sewage pump is also connected to the neutralization tank.

[0009] Furthermore, the tail gas treatment unit also includes an acid mist exhaust pipe, one end of which is connected to the quenching dust removal tower; and the other end is respectively connected to the dust-containing acid storage tank, the filtrate temporary storage tank and the hydrochloric acid storage tank.

[0010] The beneficial effects of the utility model are:

[0011] This application realizes the recovery of hydrochloric acid through a rapid cooling dust removal unit and a hydrochloric acid recovery unit; realizes the ton bag treatment of the filter residue (silicon dioxide) after filtration through a filter residue treatment unit, which can avoid dust and at the same time, the storage occupies a small area; avoids the overflow of acid mist during the treatment process through an exhaust gas treatment unit, and realizes zero gas pollution emission during the treatment process; and realizes the discharge of sewage in compliance with the standards through multiple cycles of reflux and acid-base neutralization of the sewage pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of the utility model.

[0013] In the figure: 10 is a quenching dust removal unit, 11 is a quenching dust removal tower, 12 is a dust-containing acid storage tank, 13 is a dust-containing acid delivery pump, 14 is a first filter press, 20 is a hydrochloric acid recovery unit, 21 is a filtrate temporary storage tank, 22 is a filtrate delivery pump, 23 is a hydrochloric acid storage tank, 30 is a filter residue treatment unit, 31 is a neutralization tank, 32 is a second filter press, 33 is a sewage tank, 34 is a sewage pump, 35 is a ton bag device, 40 is an exhaust gas treatment unit, 41 is an induced draft fan, 42 is an alkali washing tower, 43 is an acid mist exhaust pipe, and 50 is a pH value detector. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0015] An organosilicon waste incineration exhaust gas treatment system capable of recovering hydrochloric acid solution comprises a quenching dust removal unit 10, a hydrochloric acid recovery unit 20, a filter residue treatment unit 30 and an exhaust gas treatment unit 40;

[0016] The quenching dust removal unit 10 includes a quenching dust removal tower 11, a dust-containing acid storage tank 12, a dust-containing acid delivery pump 13 and a first filter press 14 connected in sequence;

[0017] The hydrochloric acid recovery unit 20 includes a filtrate temporary storage tank 21, a filtrate delivery pump 22 and a hydrochloric acid storage tank 23 connected in sequence; the inlet of the filtrate temporary storage tank 21 is connected to the filtrate outlet of the first filter press 14;

[0018] The filter residue processing unit 30 includes a neutralization tank 31, a second filter press 32, a sewage tank 33, and a sewage pump 34 connected in sequence; the inlet of the neutralization tank 31 is connected to the filter residue outlet of the first filter press 14; the filter residue outlet of the second filter press 32 is connected to the ton bag device 35;

[0019] The tail gas treatment unit 40 includes an induced draft fan 41 and an alkali washing tower 42 connected to the induced draft fan 41 ; the other end of the induced draft fan 41 is connected to the exhaust port of the neutralization tank 31 .

[0020] Furthermore, the quenching dust removal tower 11 is an upper and lower structure, including an upper graphite quenching section and a lower dust removal section, and the structure is similar to the combination of a graphite quenching tower and a spray dust removal tower; the graphite quenching section and the dust removal section are both provided with a spray unit, and the bottom of the dust removal section is a recovery chamber, which is connected to the dust-containing acid storage tank 12 through a pipeline, and the other route of the filtrate delivery pump 22 is respectively connected to the spray unit of the quenching dust removal tower 11, and the filtrate delivery pump 22 delivers part of the acid liquid in the filtrate temporary storage tank 21 to the quenching dust removal tower 11 to facilitate the concentration of hydrochloric acid; the specific structure of the quenching dust removal tower 11 is not a technical point protected by this application and will not be repeated here.

[0021] Furthermore, the spraying device in the quenching dust removal tower 11 sprays the waste gas after incineration. The waste gas and waste liquid after incineration in the silicone industry contain hydrochloric acid gas, silica powder, etc. After spraying through the quenching dust removal tower 11, the hydrochloric acid gas is dissolved in the spray liquid, and the silica powder also falls into the recovery chamber at the bottom of the quenching dust removal tower 11 together with the spray liquid, and is transported to the dust-containing acid storage tank 12 through a pipeline, and then transported to the first filter press 14 by the dust-containing acid delivery pump 13 for filtration. The filtrate enters the filtrate temporary storage tank 21 and is transported to the hydrochloric acid storage tank 23 by the filtrate delivery pump 22 to realize the recovery of hydrochloric acid.

[0022] Furthermore, the filter residue from the first filter press 14 enters the neutralization tank 31, alkali is added to the neutralization tank 31 for neutralization, and then transported to the second filter press 32 for filtration. After filtration, the filter residue is transported to the ton bag device 35 for ton bag packaging. The ton bag packaging after filtration can avoid the generation of a large amount of silica dust and reduce the volume; the filtrate from the second filter press 32 is discharged into the sewage pool 33 for temporary storage.

[0023] Furthermore, the acid mist in the neutralization tank 31 can be introduced into the alkali washing tower 42 for treatment through the induced draft fan 41.

[0024] Furthermore, a pH value detector 50 is provided in the neutralization tank 31 ; another route of the dust-containing acid delivery pump 13 is connected to the neutralization tank 31 ; and another route of the sewage pump 34 is also connected to the neutralization tank 31 .

[0025] Furthermore, when the pH value in the neutralization tank 31 is greater than 10, the dusty acid in the dusty acid storage tank 12 may be transported to the neutralization tank 31 by the dusty acid transport pump 13 to adjust the pH value.

[0026] Furthermore, when the sewage in the sewage pool 33 does not meet the discharge conditions, the sewage can also be transported to the neutralization tank 31 for treatment through the sewage pump 34 to ensure that the pH value of the sewage meets the discharge conditions and is discharged to the subsequent sewage treatment system.

[0027] Furthermore, the tail gas treatment unit 40 further includes an acid mist exhaust pipe 43 , one end of which is connected to the quench dust removal tower 11 ; and the other end is connected to the dust-containing acid storage tank 12 , the filtrate temporary storage tank 21 and the hydrochloric acid storage tank 23 .

[0028] Furthermore, the acidic gases in the dusty acid storage tank 12, the filtrate temporary storage tank 21 and the hydrochloric acid storage tank 23 are collected uniformly by the acid mist exhaust pipe and then enter the quenching dust removal tower 11 to ensure that no acidic gas overflows.

[0029] The embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. An organosilicon waste incineration exhaust gas treatment system capable of recovering hydrochloric acid solution, characterized by: It includes a quenching dust removal unit (10), a hydrochloric acid recovery unit (20), a filter residue treatment unit (30) and an exhaust gas treatment unit (40); The quenching dust removal unit (10) comprises a quenching dust removal tower (11), a dust-containing acid storage tank (12), a dust-containing acid delivery pump (13) and a first filter press (14) connected in sequence; The hydrochloric acid recovery unit (20) comprises a filtrate temporary storage tank (21), a filtrate delivery pump (22), and a hydrochloric acid storage tank (23) connected in sequence; the inlet of the filtrate temporary storage tank (21) is connected to the filtrate outlet of the first filter press (14); The filter residue processing unit (30) includes a neutralization tank (31), a second filter press (32), a sewage tank (33), and a sewage pump (34) connected in sequence; the inlet of the neutralization tank (31) is connected to the filter residue outlet of the first filter press (14); the filter residue outlet of the second filter press (32) is connected to the ton bag device (35); The tail gas treatment unit (40) comprises an induced draft fan (41) and an alkali washing tower (42) connected to the induced draft fan (41); the other end of the induced draft fan (41) is connected to the exhaust port of the neutralization tank (31).

2. The organic silicon waste incineration exhaust gas treatment system capable of recovering hydrochloric acid solution according to claim 1, characterized in that: The quenching dust removal tower (11) is a top-bottom structure, comprising an upper graphite quenching section and a lower dust removal section. Both the graphite quenching section and the dust removal section are provided with spray units. The bottom of the dust removal section is a recovery chamber, which is connected to the dust-containing acid storage tank (12) through a pipeline. The other route of the filtrate delivery pump (22) is respectively connected to the spray units of the quenching dust removal tower (11).

3. The organic silicon waste incineration exhaust gas treatment system capable of recovering hydrochloric acid solution according to claim 1, characterized in that: A pH value detector (50) is provided in the neutralization tank (31); another path of the dust-containing acid delivery pump (13) is connected to the neutralization tank (31); and another path of the sewage pump (34) is also connected to the neutralization tank (31).

4. The organic silicon waste incineration exhaust gas treatment system capable of recovering hydrochloric acid solution according to claim 1, characterized in that: The tail gas treatment unit (40) further comprises an acid mist exhaust pipe (43), one end of which is connected to the quenching dust removal tower (11); and the other end of which is respectively connected to the dust-containing acid storage tank (12), the filtrate temporary storage tank (21), and the hydrochloric acid storage tank (23).

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