CN112225182A

CN112225182A - System and method for preparing acid by utilizing industrial sulfur-containing waste

Info

Publication number: CN112225182A
Application number: CN202011118643.8A
Authority: CN
Inventors: 赵传军; 项裕桥
Original assignee: Ningbo Fareasttech Catalyst Engineering Co ltd
Current assignee: Ningbo Fareasttech Catalyst Engineering Co ltd
Priority date: 2020-10-19
Filing date: 2020-10-19
Publication date: 2021-01-15
Anticipated expiration: 2040-10-19
Also published as: CN112225182B

Abstract

The invention relates to a system for preparing acid by utilizing industrial sulfur-containing waste, which comprises a pretreatment unit, a drying unit and a sulfur slurry preparation unit, wherein the pretreatment unit comprises a sulfur slurry preparation unit and a drying machine; the sulfur slurry preparation unit prepares industrial sulfur-containing waste into mixed waste liquid, and the mixed waste liquid is filtered and homogenized to prepare sulfur slurry which is sent to the dryer for treatment; the dryer comprises a cylinder body and a rotating shaft, wherein at least a heating medium is introduced into the cylinder body or the rotating shaft, and the rotating shaft can be driven to rotate so as to stir the sulfur slurry in the cylinder body. The acid making system treats sulfur-containing waste before drying, removes non-incineratable sulfur-containing waste and converts the non-incineratable sulfur-containing waste into SO₂The substances are used for preparing sulfur slurry with uniform components, which is beneficial to reducing incineration residues and improving SO₂The conversion efficiency.

Description

System and method for preparing acid by utilizing industrial sulfur-containing waste

Technical Field

The invention relates to the technical field of desulfurization waste treatment, in particular to a system and a method for preparing acid by utilizing industrial sulfur-containing waste.

Background

In the fields of chemical industry, metallurgy, coking, power plants and the like, wet desulphurization processes (such as HPF desulphurization processes) are widely adopted for desulphurization. The process produces a large amount of sulfur-containing waste, such as in a coke plant, which produces a large amount of sulfur sludge, sulfur paste, sulfur-containing foam, or sulfur-containing slurry, and these waste in various states are composed mainly of sulfur, ammonium thiosulfate, ammonium thiocyanate, benzene, and a small amount of tar, although the composition may vary depending on the industry, but in the present invention we refer to these waste in various states collectively as sulfur-containing waste. Such sulfur-containing wastes have low purity of sulfur, poor quality and almost no possibility of sale, so that the existing sulfur foams and desulfurization waste liquid need to be prepared into acid. The acid preparation from the desulfurization waste liquid is mainly divided into a dry acid preparation method and a wet acid preparation method, and the dilute acid generated by the dry acid preparation method is low in amount and is favored.

In the existing dry pretreatment process for preparing acid by a dry method, sulfur-containing waste is directly dried and then incinerated, SO that the energy consumption and the working procedure are saved, but the sulfur-containing waste is directly dried and incinerated without being treated due to complex composition of the sulfur-containing waste, and the sulfur-containing waste cannot be incinerated and converted into SO₂Other impurities also enter the incineration equipment together, the incineration residue can be increased, and the residue can wrap the sulfur-containing substances, SO that the equipment operation and maintenance are not facilitated on the one hand, and the SO is also not facilitated on the other hand₂And (4) improving the conversion efficiency.

In addition, the tail gas generated in the existing drying pretreatment process is directly discharged, so that the defects of poor field operation environment, serious dust discharge, peculiar smell, corrosion and incapability of meeting the environmental protection requirement are easily caused.

Therefore, it is of great significance to continue research and development of novel acid production systems utilizing industrial sulfur-containing waste.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects in the prior art and provide a novel acid making system utilizing industrial sulfur-containing waste, wherein the acid making system is used for treating the sulfur-containing waste before drying, removing the sulfur-containing waste which cannot be incinerated and converted into SO₂The sulfur slurry obtained after treatment is beneficial to reducing incineration residues and increasing SO₂The conversion efficiency.

In order to solve the technical problems, the technical scheme adopted by the invention has the following basic concept:

a system for producing acid by using industrial sulfur-containing waste comprises a pretreatment unit, a drying unit and a sulfur slurry preparation unit, wherein the pretreatment unit comprises a sulfur slurry preparation unit and a drying machine;

the sulfur slurry preparation unit is used for preparing industrial sulfur-containing waste into mixed waste liquid, filtering and homogenizing the mixed waste liquid to prepare sulfur slurry, and sending the sulfur slurry into the dryer for treatment;

the dryer comprises a cylinder body and a rotating shaft, wherein at least a heating medium is introduced into the cylinder body or the rotating shaft, and the rotating shaft can be driven to rotate so as to stir the sulfur slurry in the cylinder body.

As an embodiment, the sulfur slurry preparation unit includes a mixed waste liquid preparation device, a filtering device and a homogenizing device; the mixed waste liquid preparation device is used for preparing sulfur-containing waste into mixed waste liquid, and an outlet of the mixed waste liquid preparation device is connected with an inlet of the filtering device so as to treat the mixed waste liquid to obtain intermediate sulfur liquid; and an intermediate sulfur liquid outlet of the filtering device is connected with an inlet of the homogenizing device so as to process the intermediate sulfur liquid to obtain sulfur slurry.

Further, as an embodiment, the sulfur slurry preparation unit further comprises a sulfur slurry tank, a sulfur slurry outlet of the homogenizing device is connected to an inlet of the sulfur slurry tank, and an outlet of the sulfur slurry tank is connected to the dryer.

As an embodiment, an intermediate tank is further disposed between the filtering device and the homogenizing device, an intermediate sulfur liquid outlet of the filtering device is connected to an inlet of the intermediate tank, and an outlet of the intermediate tank is connected to an inlet of the homogenizing device, so as to process the intermediate sulfur liquid to obtain a sulfur slurry.

As an embodiment, the outlet of the mixed waste liquid preparation device is connected with the inlet of the filtering device through a delivery pump; or the outlet of the mixed waste liquid preparation device is directly connected with the inlet of the filtering device up and down through a pipeline and flows to the inlet of the filtering device by means of the position difference.

As an embodiment, the filtration device comprises a membrane filtration device provided with an intermediate sulfur liquid outlet, a regeneration liquid outlet and a filtrate outlet; the intermediate sulfur liquid outlet is connected with the inlet of the intermediate tank, the regenerated liquid outlet is connected with the mixed waste liquid preparation device, the filtrate outlet is connected with the filtrate tank, and the outlet of the filtrate tank is connected with the circulating cooling unit in the acid making system or the external coking desulfurization system.

Further, as an embodiment, the filtration device includes a plurality of membrane filtration devices arranged in parallel.

Further, as an embodiment, the membrane filtration device is a microporous filter.

Further, as an embodiment, the homogenizing device comprises a colloid mill.

Further, as an embodiment, the homogenizing device comprises a plurality of colloid mills arranged in series.

As an embodiment, at least one of the mixed spent liquor preparation apparatus, the intermediate tank, and the sulfur slurry tank is provided with an agitation element and a heating element.

In one embodiment, the heating element includes a heating pipe, and a heating medium is introduced into the heating pipe, and more preferably, the heating medium is from the dryer.

In one embodiment, the outlet of the sulfur slurry groove enters the feeding hole of the dryer through a hopper and a screw feeder; or the outlet of the sulfur pulp groove is directly connected with the feed inlet of the dryer up and down through a pipeline and naturally settles to the feed inlet of the dryer by means of gravity; or the outlet of the sulfur slurry tank is connected with the feed inlet of the dryer through a delivery pump.

As an implementation mode, the cylinder body is provided with a hollow inner cavity for containing sulfur slurry, two ends of the cylinder body are provided with sealing end covers, the rotating shaft penetrates through the sealing end covers at the two ends, and a sealing structure is arranged between the rotating shaft and the sealing end covers.

Further, as an embodiment, the sealing structure is a dynamic sealing ring.

In one embodiment, a barrel cover is connected to the top end of the barrel body, and a sight glass is arranged on the side wall of the barrel cover.

As an implementation mode, the drying machine further comprises a motor and a driving device, wherein one end of the rotating shaft, which is close to the feeding hole of the drying machine, is connected with the driving device, and the driving device is connected with the motor.

As an implementation mode, the rotating shaft is provided with a plurality of blades, and the blades are uniformly arranged along the axial direction of the rotating shaft at intervals and form a structure capable of pushing the sulfur slurry to move towards the discharge port of the dryer with the periphery of the rotating shaft.

In one embodiment, the blade has a hollow inner cavity, and the inner cavity of the blade is communicated with the inner cavity of the rotating shaft.

As an embodiment, the two ends of the rotating shaft are respectively provided with a first inlet and a first outlet; the side wall of the cylinder body is provided with a plurality of second inlets and second outlets which are arranged along the axial direction of the cylinder body, the side wall of the cylinder body is provided with a plurality of air cavities along the axial direction, the air cavities are hollow and independently sealed cavities, and each air cavity is respectively communicated with the corresponding second inlet and second outlet; the second inlet and the first inlet are communicated with a main pipeline, and a heating medium is introduced into the main pipeline.

Further, as an embodiment, the second inlet is connected in parallel with the first inlet after being gathered and communicated with the main pipeline.

Further, as an implementation mode, the feed inlet of the dryer is communicated with an air inlet, the outer side of the air inlet is sequentially connected with a heater and a filter, and a third inlet of the heater is communicated with the main pipeline.

Further, as an embodiment, the second inlet and the second outlet are respectively disposed at the top and the bottom of the cylinder.

In one embodiment, the rotation shaft includes a first rotation shaft and a second rotation shaft arranged in parallel in an axial direction of the cylinder, and the rotation directions of the first rotation shaft and the second rotation shaft are opposite.

Further, as an embodiment, the blades on the first rotating shaft and the blades on the second rotating shaft are arranged in a staggered manner; the blade includes the edge the fan-shaped blade surface of the circumferencial direction distribution of rotation axis, the radian on fan-shaped blade surface is not more than the semicircle of rotation axis.

In one embodiment, the end of the blade for stirring the sulfur slurry is provided with a scraping structure, and the scraping structure extends along the axial direction of the rotating shaft and can be in contact with the inner wall of the cylinder.

As an implementation mode, the pretreatment unit further comprises a processor, a temperature sensor and a pressure sensor, the temperature sensor and the pressure sensor are located in the cylinder, the temperature sensor and the pressure sensor are respectively connected with the processor, and the processor is respectively electrically connected with the motor and the induced draft fan.

As an embodiment, the acid making system further comprises:

the fluidized bed furnace is used for incinerating the sulfur-containing waste dried by the dryer to generate a process gas containing sulfur dioxide;

the waste heat boiler comprises an air inlet tower, an air outlet tower and a sealing plate, wherein the air inlet tower is communicated with the air outlet tower, the air inlet tower and the air outlet tower are hermetically connected with the sealing plate, an air inlet is formed in the side wall of the air inlet tower, and an air outlet is formed in the side wall of the air outlet tower; the side walls of the air inlet tower and the air outlet tower and the closing plate are provided with hollow clamping cavities, cooling water is introduced into the hollow clamping cavities of the side walls of the air inlet tower and the air outlet tower and communicated with the hollow clamping cavities, the cooling water in the side walls converges into the closing plate, and the closing plate is provided with a steam outlet; process gas is introduced into a gas inlet of the gas inlet tower, and the steam outlet is communicated with a main pipeline; the top parts of the air inlet tower and the air outlet tower are provided with bottom plates with downward sunken structures, the sealing plate is provided with a drainage plate which vertically extends downwards, the drainage plate extends downwards into the sunken structures of the bottom plates, the drainage plate and the bottom plates are both provided with hollow inner cavities, the inner cavities of the drainage plate are communicated with the inner cavities of the sealing plate, and the inner cavities of the bottom plates are respectively communicated with the inner cavities of the side walls of the air inlet tower and the air outlet tower; the dust leakage hole is formed in the downward sunken structure of the bottom plate, a valve device is arranged at the dust leakage hole and is set to be in a normally closed state, and the valve device is changed into an openable state by means of the weight of accumulated dust.

Further, as an embodiment, the bottom plate is in a shape of "V" or "U".

As an embodiment, the pretreatment unit further comprises a tail gas scrubbing recovery system;

the tail gas washing and recovering system comprises a water washing device, an acid washing device and a tail gas washing device;

the washing device is used for washing and cooling the tail gas discharged by the dryer, the gas inlet end of the washing device is connected with the tail gas discharge port, and part of washing mixed liquid generated by washing the tail gas is filtered and then supplied to the feed port of the dryer; the acid washing device is connected with an air outlet of the water washing device and is used for neutralizing ammonia in the tail gas after water washing to generate ammonium sulfate mother liquor; and the tail gas washing device is connected with the gas outlet of the acid washing device and is used for washing and cooling the tail gas after acid washing.

In one embodiment, an outlet of the ammonium sulfate mother liquor of the pickling device is connected with one or both of an ammonium sulfate production device for producing the ammonium sulfate mother liquor into an ammonium sulfate product and a pretreatment evaporation concentration system, and an outlet of the pretreatment evaporation concentration system is connected with the dryer.

Further, as an implementation mode, the water washing device is a water washing tower, and the water washing tower is provided with a cooling water inlet and a water washing circulating pump branch; the water washing circulating pump branch comprises a first path communicated with the internal circulation of the water washing tower and a second path connected to a feed inlet of the dryer through a filtering bypass system; the filter bypass system comprises a filter, and an outlet of the filter is connected with a feed inlet of the dryer; the acid cleaning device is an acid cleaning tower, the acid cleaning tower is provided with a dilute acid branch and an acid cleaning circulating pump branch, the dilute acid branch is connected with a dilute acid supply device, the acid cleaning circulating pump branch comprises a third path communicated with the internal circulation of the acid cleaning tower, and a fourth path connected with an ammonium sulfate mother liquor tank through an ammonium sulfate mother liquor bypass.

Further, as an embodiment, the dilute acid supply equipment is a system H₂SO₄Dynamic wave wash towers are used within the system.

Further, as an implementation mode, the gas outlet of the pickling device is connected to the tail gas washing device through an induced draft fan.

The invention also provides a method for preparing acid by utilizing industrial sulfur-containing waste, which comprises a pretreatment process, wherein the pretreatment process comprises the following steps:

the preparation method of the sulfur slurry comprises the following steps: preparing industrial sulfur-containing waste into mixed waste liquid, and preparing sulfur slurry through filtering and homogenizing;

the drying process comprises the following steps: and (3) sending the sulfur slurry obtained in the sulfur slurry preparation step into a drier, and heating and drying the sulfur slurry by using a heating medium.

As an embodiment, the step of preparing the sulfur slurry further comprises a water content adjusting process, wherein the water content adjusting process is at least one or more of the steps of preparing the mixed waste liquid, preparing the intermediate sulfur liquid by filtering the mixed waste liquid, or preparing the sulfur slurry by the intermediate sulfur liquid.

Further, as an embodiment, the acid making method further comprises a tail gas washing and recovering process, wherein the tail gas washing and recovering process comprises the following steps:

step S11: washing and cooling tail gas discharged by the dryer to form washing mixed liquid, and conveying a part of the washing mixed liquid into the dryer for recycling;

step S12: the tail gas after washing and cooling enters an acid washing tower, acid washing is carried out by acid liquor to generate ammonium sulfate mother liquor with certain concentration, and the ammonium sulfate mother liquor is utilized to prepare an ammonium sulfate finished product;

step S13: and (4) the tail gas after acid washing enters a tail gas washing device for washing and cooling, and the tail gas after washing is discharged into the atmosphere.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of a configuration of a sulfur-containing waste acid production system according to the present invention;

FIG. 2 is a schematic diagram of a configuration of a sulfur slurry preparation unit;

FIG. 3 is a schematic view of the structure of the dryer;

FIG. 4 is a schematic structural view of a waste heat boiler;

FIG. 5 is a cross-sectional view of a cartridge;

FIG. 6 is a cross-sectional view A-A shown in FIG. 5;

FIG. 7 is a side cross-sectional view of an alternative cartridge;

FIG. 8 is a cross-sectional view B-B shown in FIG. 7;

the figure is marked with: 10-a sulphur pulp preparation unit; 101-a mixed waste liquid preparation device; 102-a filtration device; 103-an intermediate tank; 104-an intermediate tank; 105-sulphur pulp tank; a barrel; 12-a rotating shaft; 13-a bearing seat; 14-a first inlet; 15-a first outlet; 16-a feed inlet; 17-a discharge hole; 18-exhaust gas discharge port; 19-a water wash column; 20-acid washing tower; 21-an off-gas wash column; 22-washing the circulating pump branch; 23-cooling water inlet; 24-a filtration bypass system; 25-dilute acid branch; 26-acid washing circulating pump branch; a 27-ammonium sulfate mother liquor bypass; 28-induced draft fan; 29-circulation washing pump branch; 30-an overflow outlet; 31-a discharge port; 32-a motor; 33-a drive device; 34-a blade; 35-a second inlet; 36-a second outlet; 37-air cavity; 38-main pipe; 39-an air inlet; 40-; heater 41-filter; 42-view mirror; 43-an air intake tower; 44-an air outlet tower; 45-a closing plate; 46-an air inlet; 47-air outlet; 48-a steam outlet; 49- "V" shaped bottom plate; 50-a drainage plate; 51-ash holes; 52-third inlet; 53-a valve arrangement; 54-cartridge cover; 60-coating; 61-inner sleeve; 62-spacer bush; 63-a baffle; 64-first slot; 65-second slot; 66-scraping structure; 121-a first axis of rotation; 122-second axis of rotation.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a system for preparing acid by utilizing industrial sulfur-containing waste, which comprises a pretreatment unit, a drying unit and a sulfur slurry preparation unit, wherein the pretreatment unit comprises a sulfur slurry preparation unit 10 and a dryer, and is shown in figure 1; the sulfur slurry preparation unit 10 prepares industrial sulfur-containing waste into mixed waste liquid, and then prepares sulfur slurry through filtration and homogenization and sends the sulfur slurry into the dryer for treatment; the dryer comprises a cylinder 11 and a rotating shaft 12, wherein at least a heating medium is introduced into the cylinder 11 or the rotating shaft 12, and the rotating shaft 12 can be driven to rotate so as to stir sulfur slurry in the cylinder 11.

The industrial sulfur-containing waste may be sulfur-containing waste generated by coal chemical industry, including but not limited to sulfur-containing waste generated by desulfurization process (e.g. HPF desulfurization process) using wet desulfurization process, such as in coke-oven plant, generating a large amount of sulfur sludge, sulfur paste, sulfur-containing foam or sulfur-containing slurry, and the waste in different states mainly consists of sulfur, ammonium thiosulfate, ammonium thiocyanate, benzene and a small amount of tar, although the composition varies according to different industries, but the waste in different states is collectively referred to as sulfur-containing waste in the present invention.

As an embodiment, the sulfur slurry preparation unit 10 has a structure shown in fig. 2, and the sulfur slurry preparation unit 10 includes a mixed waste liquid preparation device 101, a filtering device 102, a homogenizing device 104, and a sulfur slurry tank 105. The mixed waste liquid preparation device 101 is used for preparing the sulfur-containing waste into the mixed waste liquid, and an outlet of the mixed waste liquid preparation device 101 is connected with an inlet of the filtering device 102 so as to treat the mixed waste liquid to obtain an intermediate sulfur liquid (namely, a substance obtained after the mixed waste liquid is subjected to filtering treatment). The intermediate sulfur liquid outlet of the filtering device 102 is connected to the inlet of the homogenizing device 104 to process the intermediate sulfur liquid to obtain a sulfur slurry (i.e., a substance obtained by homogenizing the intermediate sulfur liquid, which can be directly fed into a dryer for processing).

Preferably, the sulfur slurry outlet of the homogenizing device 104 is connected with the inlet of the sulfur slurry tank 105, and the outlet of the sulfur slurry tank 105 is connected with the dryer.

Of course, the slurry outlet of the homogenizing device 104 may also be connected to the dryer by other similar means, for example, the slurry outlet of the homogenizing device 104 is directly connected to the dryer by a pipe.

The sulfur slurry prepared by the above-described sulfur slurry preparation unit 10 is non-incineratable to convert into SO₂The components are obviously reduced, a large amount of residues generated in the incinerator are avoided, the probability of stopping for cleaning or maintaining is reduced, the production efficiency of the whole acid making system is improved, and the service life of equipment is prolonged. In particular, the conversion of the sulfur slurry into SO-containing slurry is also improved₂The efficiency of the process gas and the yield of sulfuric acid are obviously increased.

Further, as another embodiment, an intermediate tank 103 is further disposed between the filtering device 102 and the homogenizing device 104, an intermediate sulfur liquid outlet of the filtering device 102 is connected to an inlet of the intermediate tank 103, and an outlet of the intermediate tank 103 is connected to an inlet of the homogenizing device 104, so as to process the intermediate sulfur liquid to obtain a sulfur slurry.

The arrangement of the intermediate tank 103 is convenient for flexibly adjusting the acid making rate of the system according to the operation condition of the acid making system, reduces the probability of accidental shutdown of the acid making system, and is beneficial to maintaining the operation continuity of the acid making system.

As an example, the outlet of the mixed waste liquid preparation apparatus 101 is connected to the inlet of the filtering apparatus 102 by a transfer pump. Or, the outlet of the mixed waste liquid preparation device 101 is directly connected with the inlet of the filtering device 102 up and down through a pipeline, and naturally flows to the inlet of the filtering device 102 by means of potential difference.

Specifically, as an example, the filtering device 102 includes a plurality of microporous filters arranged in parallel, and the microporous filters are provided with an intermediate sulfur liquid outlet, a regeneration liquid outlet and a filtrate outlet. The intermediate sulfur liquid outlet is connected with the inlet of the intermediate tank 103, the regenerated liquid outlet is connected with the mixed waste liquid preparation device 101, and the filtrate outlet is connected with a filtrate tank (not shown in the figure). The export of filtrate groove is connected with the inside circulative cooling unit of system acid, perhaps is connected with outside coking desulfurization system, so can utilize the filtrating that the separation obtained as the inside cooling medium of system acid to the condition that is equipped with coking desulfurization system to the factory, can also be used for outside coking desulfurization system's cooling medium, and then show reduction industrial water, the water economy resource reduces industrial cost.

The homogenizing device 104 comprises a plurality of colloid mills which are sequentially connected in series, so that the prepared sulfur slurry is more uniformly dispersed, the sulfur slurry is conveniently fully dried in a dryer to obtain powder sulfur with uniform particles, and the sulfur slurry is more favorably and efficiently converted to contain S0₂And (4) process gas.

The mixing waste liquid preparation device 101, the intermediate tank 103 and the sulfur slurry tank 105 are all provided with stirring elements and heating elements. The heating element comprises a heating pipeline, a heating medium is introduced into the heating pipeline, and the heating medium comes from the dryer. The outlet of the sulphur pulp tank 105 enters the feed inlet of the dryer through a hopper and a screw feeder. Or the outlet of the sulfur pulp groove 105 is directly connected with the feeding hole of the dryer up and down through a pipeline and naturally settles to the feeding hole of the dryer by means of gravity.

The heating element can utilize the heating medium from the dryer so as to adjust the water content of the mixed waste liquid, the intermediate sulfur liquid or the sulfur slurry to a proper range in the corresponding process section, obtain granular sulfur-containing materials with uniform particles and good dispersibility after being dried by the dryer, fully burn and convert, and reduce energy consumption under the condition of improving the utilization rate of the materials.

Controlling the heating temperature and the heating time of the heating element, controlling the water content of the intermediate sulfur liquid in the intermediate tank 103 to be 35-45 wt%, and controlling the water content of the sulfur slurry in the sulfur slurry tank 105 to be 40-55 wt%.

Further, as a preferred embodiment of the present invention, referring to fig. 1, the pretreatment unit further comprises a tail gas scrubbing recovery system. The tail gas washing and recovering system comprises a water washing device, an acid washing device and a tail gas washing device which are sequentially connected; the washing device is used for washing and cooling the tail gas discharged by the dryer, the gas inlet end of the washing device is connected with the tail gas discharge port 18, and part of washing mixed liquid generated by washing the tail gas is filtered and then supplied to the feed port of the dryer; the acid washing device is connected with an air outlet of the water washing device and is used for neutralizing ammonia in the tail gas after water washing to generate ammonium sulfate mother liquor; and the tail gas washing device is connected with the gas outlet of the acid washing device and is used for washing and cooling the tail gas after acid washing.

As an example, the water washing device is a water washing tower 19, the acid washing device is an acid washing tower 20, and the tail gas washing device is a tail gas washing tower 21.

As an embodiment, the sulfur slurry to be treated enters the feeding hole 16 of the dryer through a hopper and a screw feeder, or the sulfur slurry to be treated is directly connected up and down through a pipeline and naturally settles to the feeding hole 16 of the dryer by means of gravity.

As an embodiment, the cylinder 11 has a hollow inner cavity capable of containing sulfur-containing waste, two ends of the cylinder 11 are provided with end caps, the rotating shaft 12 penetrates through the end caps at the two ends, a dynamic seal ring is arranged between the rotating shaft 12 and the end caps, and the rotating shaft 12 is rotatably connected with bearing seats 13 at two sides.

The utility model discloses a heating device, including rotation axis 12, first import 14 and first export 15, the both ends of rotation axis 12 are equipped with feed inlet 16 and discharge gate 17 respectively, and feed inlet 16 is located the top of barrel 11 just is close to one side of first import 14, discharge gate 17 are located the bottom of barrel 11, the top of barrel 11 is equipped with exhaust emission port 18, and exhaust emission port 18 is located with discharge gate 17 the homonymy of barrel 11 just is close to one side of first export 15, first import 14 lets in heating medium.

As an embodiment, the tail gas washing and recovering system comprises a water washing tower 19, an acid washing tower 20 and a tail gas washing tower 21 which are connected in sequence; the air inlet end of the water washing tower 19 is connected with the tail gas discharge port 18, and the water washing tower 19 is connected with a water washing circulating pump branch 22 and a cooling water inlet 23.

The water washing circulation pump branch 22 includes a first branch communicated with the internal circulation of the water washing tower 19, and a second branch connected to the feed port of the dryer via a filtration bypass system 24. The filter bypass system 24 includes a filter having an outlet connected to the inlet of the dryer.

So set up, can utilize the washing mixed liquid of a part to continue to be used for the circulation to wash tail gas and carry out exhaust purification fully, another part is used as the raw materials liquid of sulphur cream preparation, realizes the inside material cyclic utilization of system, reduces outer waste liquid of arranging, improves the output of system acid, green.

In a preferred embodiment, the outlet of the ammonium sulfate mother liquor of the acid washing tower 20 is connected to one or both of an ammonium sulfate production device for producing the ammonium sulfate mother liquor into an ammonium sulfate product and a pretreatment evaporation concentration system, and the outlet of the pretreatment evaporation concentration system is connected to the dryer.

In one embodiment, the acid washing tower 20 is provided with a dilute acid branch 25 and an acid washing circulation pump branch 26, and the dilute acid branch 25 is connected to a dilute acid supply device.

By way of example, the dilute acid supply device may be a dynamic wave scrubber used in an acid making system, and the dilute acid branch 25 is used for delivering the dilute acid liquid of the dynamic wave scrubber used in the acid making system to the acid washing tower 20. An induced draft fan 28 is connected between the pickling tower 20 and the tail gas washing tower 21, the tail gas washing tower 21 is provided with a cooling water inlet 23, a circulating washing pump branch 29, an overflow outlet 30 and a discharge port 31, and the discharge port is arranged at the top of the tail gas washing tower 21.

The pickling circulation pump branch line 26 includes a third path that is in circulation communication with the inside of the pickling tower 20, and a fourth path that is connected to an ammonium sulfate mother liquor tank via an ammonium sulfate mother liquor bypass 27.

So set up, can utilize partly pickling mixed liquid to continue to be used for circulation washing tail gas to carry out exhaust purification fully, another part is used as the raw materials liquid of ammonium sulfate preparation, realizes the make full use of material, increases the product kind, improves economic income to it is few, more green to discharge the waste liquid.

For a better understanding of the present invention, an exemplary workflow of the present invention utilizing an industrial sulfur-containing waste acid production system is described in detail below:

industrial sulfur-containing wastes including but not limited to sulfur paste, sulfur foam, and concentrated salt from a coke plant are put into the mixed waste liquid preparing apparatus 101, sufficiently stirred and mixed while evaporating water by means of a heating element, to prepare a mixed waste liquid having a certain water content. Then the mixed waste liquid is pumped into two microporous filters which are arranged in parallel, impurities are removed through filtration, the middle sulfur liquid obtained through filtration of the microporous filters enters a middle groove 103 from a middle sulfur liquid outlet arranged below the middle sulfur liquid to be stored, secondary evaporation of water is carried out at the same time, the water content of the middle sulfur liquid is adjusted, then the middle sulfur liquid sequentially enters a first-stage colloid mill and a second-stage colloid mill which are arranged in series to be homogenized for the first stage and the second stage, and then the middle sulfur liquid enters a sulfur slurry groove 105 to be evaporated for the third time, so that sulfur slurry with the water content suitable for being dried in a dryer is obtained.

Still be equipped with the regeneration liquid export on the microporous filter, regeneration liquid exit linkage mixes waste liquid preparation facilities 101, carries out recycle as the partial raw materials of preparation mixed waste liquid with the regeneration liquid, reduces the waste liquid and arranges outward, improves material utilization. Meanwhile, a filtrate outlet is formed in the microporous filter and connected with a filtrate tank, and the outlet of the filtrate tank is connected with a circulating cooling unit inside the acid making system or connected with an external coking desulfurization system and used as a cooling medium, so that the additional use of cooling water is reduced, and water resources are saved.

The sulfur slurry obtained by the sulfur slurry preparation unit 10 enters the feed inlet of the dryer in any one or more of the following ways: an outlet of the sulfur slurry groove 105 enters a feeding hole of the dryer through a hopper and a screw feeder; or the outlet of the sulfur pulp tank 105 is directly connected with the feed inlet of the dryer up and down through a pipeline and naturally settles to the feed inlet of the dryer by means of gravity; alternatively, the outlet of the sulfur slurry tank 105 is connected with the feed inlet of the dryer through a delivery pump.

After the sulfur slurry enters the cylinder 11 of the dryer, the sulfur slurry is gradually conveyed to the discharge port through the rotation of the rotating shaft 12, and in the process of conveying the sulfur slurry to the discharge port, the sulfur slurry can be simultaneously heated and dried into powdered sulfur powder because the cylinder 11 or the rotating shaft 12 or the cylinder 11 and the rotating shaft 12 are filled with heating media.

The heating medium can be steam, and the dried sulfur slurry discharged from the discharge port is conveyed to the storage bin through a closed conveying system. The material particles are smaller after being dried by the dryer, part of the particles are taken out from the tail gas discharge port along with the gas, and the pollution can be caused by directly discharging the evaporated material from the tail gas discharge port due to the ammonia contained in the material. The gas discharged from the exhaust gas discharge port is collectively referred to as exhaust gas in the present invention.

The tail gas discharged by the dryer is washed and cooled by the water washing tower 19, one part of the water washing mixed liquid in the water washing tower 19 is filtered and separated by solid particles and then is used as acid making raw material to return to the feed inlet of the dryer, and the other part of the water washing mixed liquid is used as circulating washing liquid to circulate and fully wash the tail gas.

The tail gas enters the acid washing tower 20, ammonia in the tail gas is neutralized with dilute acid liquid to generate ammonium sulfate mother liquor, one part of acid washing mixed liquor is conveyed to the ammonium sulfate mother liquor tank to be manufactured into an ammonium sulfate finished product for sale, and the other part of acid washing mixed liquor is used for circularly washing the tail gas.

The tail gas after acid washing enters a tail gas washing tower 21 through a draught fan for further washing and cooling, and the tail gas after being washed clean meets the environmental protection requirement and is discharged into the atmosphere through a discharge port.

According to the invention, the induced draft fan is used between the pickling tower 20 and the tail gas washing tower 21, so that on one hand, micro negative pressure can be formed in each device and pipeline, the escape of powder particles is avoided, and on the other hand, the energy consumption is obviously reduced. The sealing structure of the dynamic sealing ring is arranged between the sealing end cover of the drying machine and the rotating shaft 12, so that the leakage of powder particles is further avoided.

In the drying pretreatment process, the generated tail gas is washed and purified, meanwhile, the ammonia is further recycled, the ammonia escape is reduced, the product is manufactured by using the ammonium sulfate mother liquor generated in the system, the cost is low, and the economic benefit is improved.

The invention also realizes the recycling of solid particles, reduces the emission of dust, improves the field operation environment and is more environment-friendly.

The following further describes a specific structure of the dryer used in the present invention:

referring to fig. 3 and 5-6, the dryer further includes a motor 32 and a driving device 33, wherein the end of the rotary shaft 12 near the feed opening 16 is connected to the driving device 33, and the driving device 33 is connected to the motor 32. The rotating shaft 12 is provided with a plurality of blades 34, the blades 34 are uniformly arranged along the axial direction of the rotating shaft 12 at intervals, and a structure capable of pushing the sulfur slurry to move towards the discharge port 17 of the dryer is formed on the periphery of the rotating shaft 12. The rotary shaft 12 is provided at both ends thereof with a first inlet 14 and a first outlet 15, respectively.

As a preferable mode, the top end of the barrel 11 is connected with the barrel cover 54, the side wall of the barrel cover 54 is provided with the sight glass 42, further, the sight glass 42 can be arranged on the side wall of the two sides of the barrel cover 54 which are inclined inwards and upwards, which is beneficial for an operator to observe the drying degree of the materials in the barrel, and the material feeding amount can be adjusted according to the material condition in the barrel, or the steam amount is adjusted to adjust the temperature in the barrel, thereby stably controlling the drying process.

The blade 34 has a hollow inner cavity, and the inner cavity of the blade 34 communicates with the inner cavity of the rotary shaft 12. The side wall of the cylinder 11 is provided with a plurality of second inlets 35 and second outlets 36, the second inlets 35 and the second outlets 36 are arranged along the axial direction of the cylinder 11, the second inlets 35 and the second outlets 36 are respectively arranged at the top and the bottom of the cylinder 11, the side wall of the cylinder 11 is provided with a plurality of air chambers 37 along the axial direction, the air chambers 37 are hollow and are independently sealed chambers, and each air chamber 37 is respectively communicated with the corresponding second inlet 35 and second outlet 36; the second inlet 35 is connected with the first inlet 14 in parallel after being gathered and is communicated with a main pipeline 38, and a heating medium is introduced into the main pipeline 38; the inlet 16 of the dryer is communicated with an air inlet 39, the outer side of the air inlet 39 is sequentially connected with a heater 40 and a filter 41, and a third inlet 52 of the heater 40 is communicated with the main pipeline 38. The plurality of second outlets 36 may be combined into a header pipe to discharge the condensed water generated by the heat release of the steam.

The following is a specific structure of the cylinder 11:

the cylinder 11 can include an outer sleeve 60, a plurality of inner sleeves 61 and a plurality of spacer sleeves 62, the spacer sleeves 62 are uniformly arranged along the axial direction of the outer sleeve 60 at intervals, an independent sealed air cavity 37 is formed between each inner sleeve 61, each spacer sleeve 62 and the outer sleeve 60, the air cavities at two ends are enclosed by end covers, a plurality of baffle plates 63 are uniformly arranged in each air cavity along the radial direction, the top end of the baffle plate 63 connected with the outer sleeve is provided with a first long hole 64, or the bottom end connected with the inner sleeve is provided with a second long hole 65, and the first long hole 64 and the second long hole 65 are arranged at intervals up and down; the steam enters the air cavity from the third inlet 35 and can reach the third outlet 36 at the bottom in a circuitous route (for example, an 'S' -shaped route) in two ways, so that the traveling path and the retention time of the steam in the air cavity can be prolonged, and in addition, the outer surface of the outer sleeve can be provided with a heat insulation material to promote the steam in the air cavity to better, more fully and more uniformly heat the materials in the cylinder; the third inlet 35 and the third outlet 36 are both provided in the casing 60.

As shown in fig. 7 to 8, another preferred embodiment of the barrel 11 in the present invention is:

the bottom of the cylinder body 11 is in a semi-elliptical arc shape, and the bottom and the side wall are in arc transition, so that the phenomenon of stacking in the cylinder body can be avoided; in addition, the two sides of the outer sleeve 60 of the cylinder body 11 are provided with second inlets 35, steam can be introduced, and condensed water is finally discharged from the second outlets 36 at the bottom of the cylinder body 11 after the materials in the cylinder are heated.

In order to avoid the wall hanging of the materials in the cylinder and improve the heating and drying efficiency of the materials, the technical scheme of the invention is also designed as follows:

the rotary shaft 12 includes a first rotary shaft 121 disposed in parallel in the axial direction of the cylinder 11 and

and a second rotation shaft 122, wherein the rotation directions of the first rotation shaft 121 and the second rotation shaft 122 are opposite.

The blades 34 of the first rotating shaft 121 are staggered with the blades 34 of the second rotating shaft 122. The blade 34 includes a fan-shaped blade surface that is distributed along the circumferential direction of the rotating shaft 12, and the radian of the fan-shaped blade surface is not greater than the semicircle of the rotating shaft 12.

The end of the blade 34 used for stirring the sulfur slurry is provided with a scraping structure 66, and the scraping structure 66 extends along the axial direction of the rotating shaft 12 and can be contacted with the inner wall of the cylinder 11.

The rotating shaft of the invention adopts double-shaft reverse rotation, thus improving the stirring efficiency of the rotating shaft to the materials, increasing the heated area of the materials while stirring, and being beneficial to the evaporation of the moisture in the materials; scraping structure 66 can also reach the effect that improves stirring efficiency to scraping the accumulational material in bottom in rotatory in-process, has also increased the radiant heat area simultaneously.

The pretreatment unit further comprises a processor, a temperature sensor and a pressure sensor, wherein the temperature sensor and the pressure sensor are located in the cylinder body 11, the temperature sensor and the pressure sensor are respectively connected with the processor, and the processor is respectively and electrically connected with the motor 32 and the induced draft fan 28.

Further, the acid making system utilizing industrial sulfur-containing waste further comprises:

the fluidized bed furnace is used for burning the dried sulfur slurry of the dryer to generate process gas containing sulfur dioxide;

a waste heat boiler, as shown in fig. 4, the heat boiler includes an air inlet tower 43, an air outlet tower 44 and a closing plate 45, the air inlet tower 43 is communicated with the air outlet tower 44, the air inlet tower 43 and the air outlet tower 44 are hermetically connected with the closing plate 45, an air inlet 46 is arranged on the side wall of the air inlet tower 43, and an air outlet 47 is arranged on the side wall of the air outlet tower 44; the side walls of the air inlet tower 43 and the air outlet tower 44 and the closing plate 45 are provided with hollow clamping cavities, cooling water is introduced into the hollow clamping cavities of the side walls of the air inlet tower 43 and the air outlet tower 44 and communicated with each other, the cooling water in the side walls converges into the closing plate 45, and the closing plate 45 is provided with a steam outlet 48; the process gas is introduced into the gas inlet 46 of the gas inlet tower 43, and the steam outlet 48 is communicated with the main pipeline 38; the top of the air inlet tower 43 and the top of the air outlet tower 44 are provided with a bottom plate 49 with a downward concave structure, the closing plate 45 is provided with a drainage plate 50 extending vertically downwards, the drainage plate 50 extends downwards into the concave structure of the bottom plate 49, the drainage plate 50 and the bottom plate 49 are both provided with hollow inner cavities, the inner cavity of the drainage plate 50 is communicated with the inner cavity of the closing plate 45, and the inner cavity of the bottom plate 49 is respectively communicated with the inner cavities of the side walls of the air inlet tower 43 and the air outlet tower 44;

the bottom plate 49 is provided with a dust leaking hole 51 at the downward concave structure, a valve device 53 is arranged at the dust leaking hole 51, the valve device 53 is set to be in a normally closed state, and the valve device 53 is changed into an openable state by means of the weight of accumulated dust.

In a specific embodiment, the bottom plate 49 may be in a V-shaped or U-shaped structure.

The invention also relates to a method for preparing acid by utilizing the industrial sulfur-containing waste, which comprises a pretreatment process; the pretreatment process comprises the following steps:

the drying process comprises the following steps: and (3) delivering the sulfur slurry obtained in the sulfur slurry preparation step into a cylinder body 11 of a dryer, and heating and drying the sulfur slurry by using a heating medium.

In one embodiment, in the step of preparing the sulfur slurry, the sulfur-containing waste is prepared into a mixed waste liquid in a mixed waste liquid preparation device 101, an outlet of the mixed waste liquid preparation device 101 is connected with an inlet of a filtering device 102, and an intermediate sulfur liquid is obtained by filtering treatment in the filtering device 102; an intermediate sulfur liquid outlet of the filtering device 102 is connected with an inlet of the homogenizing device 104 so as to process the intermediate sulfur liquid to obtain sulfur slurry; the sulfur slurry outlet of the homogenizing device 104 is connected with the inlet of the sulfur slurry tank 105, and the water content of the sulfur slurry is evaporated and adjusted in the sulfur slurry tank 105.

Further, the acid making method also comprises the following tail gas washing and recycling process steps:

As an embodiment, the drying process specifically comprises the following steps: the method comprises the steps of putting sulfur-containing waste into a cylinder body 11 of a dryer, stirring and pushing the sulfur-containing material to move from a feed inlet 16 to a discharge outlet 17 in the cylinder body 11 by a rotating shaft 12 of the dryer, and simultaneously heating and drying the sulfur-containing waste by a heating medium, wherein the heating medium is at least arranged in the cylinder body 11 or the rotating shaft 12.

As a preferred embodiment, the acid making method is based on the acid making system, and specifically adopts the following drying process steps:

heating medium introduced into the main pipeline 38 enters an inner cavity of the rotating shaft 12 through the second inlet 35, one end of the rotating shaft 12 close to the feeding hole 16 is driven by a motor, the blades 34 stir and push sulfur-containing materials to move in the cylinder from the feeding hole 16 to the discharging hole 17 in the rotating process, and the heating medium in the inner cavity of the rotating shaft 12 flows into the inner cavity of the blades 34 to heat sulfur slurry; heating medium introduced into the main pipeline 38 enters each air cavity on the side wall of the cylinder body through the second inlet 35 to heat and dry the sulfur slurry in the cylinder body 11; the heating medium that total 38 let in gets into the heater through third import 52, and the air that filters gets into in barrel 11 through the air inlet after the heating, and in the sulfur thick liquid got into barrel 11 through the feed inlet simultaneously, the heated air stirs and heats the drying to the sulfur thick liquid in the barrel 11, dilutes the ammonia concentration in the barrel 11 simultaneously.

As an embodiment, the pretreatment process further comprises the following steps:

the temperature sensor is used for detecting the working temperature in the cylinder and sending the detected temperature value to the processor, the processor receives and processes the detected temperature value, and if the temperature is lower than a set threshold value, the processor sends a signal to the motor, adjusts the speed of the motor and controls the speed of discharging;

the pressure sensor is used for detecting the working pressure in the cylinder and sending the detected pressure value to the processor, the processor receives and processes the detected pressure value, and if the pressure is higher than a set negative pressure threshold value, the processor sends a signal to the induced draft fan to adjust the speed of the induced draft fan.

As an embodiment, the acid production method of the present invention further includes:

the incineration recovery process comprises the following steps: burning granular solid sulfur powder obtained after drying by a dryer to generate process gas containing sulfur dioxide;

the waste heat recovery process comprises the following steps:

the process gas containing sulfur dioxide enters through the gas inlet on the side wall of the gas inlet tower close to the top end, is guided by the flow guide plate, ascends from top to bottom to enter the gas outlet tower according to the S-shaped route, then is guided by the flow guide plate of the gas outlet tower, ascends from top to bottom to reach the gas outlet according to the S-shaped route, meanwhile, the retention time of the process gas in the gas inlet tower and the gas outlet tower is prolonged, the inner cavity of the flow guide plate is communicated with cooling water in the inner cavity of the top sealing plate, the V-shaped bottom plates of the gas inlet tower and the gas outlet tower are communicated with the side wall, cooling water in the side wall converges into the sealing plate, and the process gas and the cooling water perform more sufficient and uniform heat exchange; the cooling water is heated to become steam, and the steam escapes from the top end of the sealing plate and is conveyed to the main pipeline to be used as a heating medium of the dryer, so that the waste heat recovery of the process gas containing sulfur dioxide by the waste heat boiler is realized.

The sulfur foam is filtered by a filter, and the filter is provided with a back flushing flow. The water content at the outlet of the filter is about 50 percent, the filter enters a sulfur slurry tank to be uniformly stirred and then is conveyed to a dryer through a sulfur slurry pump to be dried, because the water content is high, the required heat exchange area is large, the two-stage dryer connected in series is adopted for drying in the prior art, the occupied area of the system is large, the energy consumption is high, and aiming at the problem, the applicant of the invention adopts the following technical scheme:

the pretreatment process also comprises the following steps:

the sulfur slurry to be pretreated comprises sulfur paste and mixed salt; the sulfur paste after centrifugal dehydration by a horizontal centrifuge and the mixed salt after concentration and crystallization enter a feed inlet of a dryer through a hopper and a screw feeder;

or the sulfur paste after centrifugal dehydration by a horizontal centrifuge and the concentrated aqueous mixed salt concentrated solution are directly connected up and down through a pipeline and naturally settle to a feed inlet of a dryer by means of gravity.

After the improvement of the process steps, the requirements can be met by adopting a primary dryer, the total occupied area of an acid making system is reduced, the structure of the dryer is optimized, the steam consumption is reduced, and the energy is saved.

Compared with the prior art, the technical scheme also has the following advantages:

1. the invention provides a system and a method for preparing acid by utilizing sulfur pulp, and the system and the method are used in the drying pretreatment process

In the process, the generated tail gas is washed and purified, and meanwhile, the ammonia is recycled; the recycling of solid particles is realized, the escape of ammonia is reduced, the emission of dust is reduced, the field operation environment is improved, and the environmental protection requirement is met.

2. In the tail gas washing and recycling process, part of the mixed liquid of the tail gas discharged by the dryer and repeatedly washed by the washing tower and cooled by water is used as washing liquid for circular washing, and the other part of the mixed liquid is filtered by solid particles and then conveyed to the dryer for recycling, so that no solid waste is discharged and no secondary pollution is generated;

the tail gas washed and cooled by the washing tower enters an acid washing tower, dilute acid liquid generated by a dynamic wave washing tower in the integral subsequent process steps in the acid making method is conveyed to the acid washing tower, the dilute acid generated in the acid making process reacts with ammonia in the tail gas to generate ammonium sulfate, and the ammonium sulfate mother liquor with a certain concentration is formed through repeated circulating acid washing; the ammonium sulfate mother liquor and the mother liquor of the final tail gas treatment in the acid making process can be conveyed to the original ammonium sulfate mother liquor tank of the factory to be mixed for use, and the finished product of ammonium sulfate is prepared; or, the raw materials are firstly treated by a desulfurization liquid pretreatment evaporation concentration system, then are combined with sulfur paste to enter a dryer, and then enter a furnace for combustion and cracking as the raw materials of the preparation process gas, and the acid making system basically does not discharge dilute acid and salt-containing waste liquid, so that the waste discharge is reduced, the environment is protected, the utilization effect of the materials and the economic benefit of enterprises are improved, and the system is a green, environment-friendly, economic and efficient chemical production system.

3. The system and the method for preparing acid by utilizing the sulfur slurry are beneficial to observing the cylinder body by an operator

The drying degree of the materials in the drying device can adjust the feeding amount of the materials according to the material conditions in the cylinder, or the temperature in the cylinder can be adjusted by adjusting the steam amount, so that the drying process is stably controlled.

4. The system and the method for preparing acid by utilizing the sulfur slurry can utilize a waste heat boiler pair

The process gas containing sulfur dioxide is subjected to waste heat recovery, cooling water is heated to be changed into steam which is used as a heating medium of the dryer, and the steam is reused to heat materials in the cylinder body better, more fully and more uniformly.

5. The system and the method for preparing acid by utilizing the sulfur pulp, which are provided by the invention, have the advantages that through the improvement of the process steps,

the requirements can be met by adopting the primary dryer, the structure of the dryer is optimized, the steam consumption is reduced, and the energy is saved.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A system for producing acid by using industrial sulfur-containing waste is characterized by comprising a pretreatment unit, wherein the pretreatment unit comprises a sulfur slurry preparation unit (10) and a dryer;

the sulfur slurry preparation unit (10) prepares industrial sulfur-containing waste into mixed waste liquid, and then the mixed waste liquid is filtered and homogenized to prepare sulfur slurry which is sent to the dryer for treatment;

the dryer comprises a cylinder (11) and a rotating shaft (12), wherein at least a heating medium is introduced into the cylinder (11) or the rotating shaft (12), and the rotating shaft (12) can be driven to rotate so as to stir sulfur slurry in the cylinder (11).

2. The system for producing acid using industrial sulfur-containing waste according to claim 1, wherein the sulfur slurry preparation unit (10) comprises a mixed waste liquid preparation device (101) and a filtering device (102), a homogenizing device (104);

the mixed waste liquid preparation device (101) is used for preparing sulfur-containing waste into mixed waste liquid, and an outlet of the mixed waste liquid preparation device (101) is connected with an inlet of the filtering device (102) so as to treat the mixed waste liquid to obtain intermediate sulfur liquid; an intermediate sulfur liquid outlet of the filtering device (102) is connected with an inlet of the homogenizing device (104) so as to process the intermediate sulfur liquid to obtain sulfur slurry;

preferably, the sulfur pulp preparation unit (10) further comprises a sulfur pulp tank (105), the sulfur pulp outlet of the homogenizing device (104) is connected with the inlet of the sulfur pulp tank (105), and the outlet of the sulfur pulp tank (105) is connected with the dryer;

preferably, an intermediate tank (103) is further arranged between the filtering device (102) and the homogenizing device (104), an intermediate sulfur liquid outlet of the filtering device (102) is connected with an inlet of the intermediate tank (103), and an outlet of the intermediate tank (103) is connected with an inlet of the homogenizing device (104) so as to process the intermediate sulfur liquid to obtain sulfur slurry;

preferably, the outlet of the mixed waste liquid preparation device (101) is connected with the inlet of the filtering device (102) through a conveying pump; or the outlet of the mixed waste liquid preparation device (101) is directly connected with the inlet of the filtering device (102) up and down through a pipeline and flows to the inlet of the filtering device (102) by means of the position difference.

3. The system for producing acid from industrial sulfur-containing waste according to claim 2, wherein the filtering device (102) comprises a membrane filtering device provided with an intermediate sulfur liquid outlet, a regeneration liquid outlet and a filtrate outlet;

the intermediate sulfur liquid outlet is connected with an inlet of the intermediate tank (103), the regenerated liquid outlet is connected with the mixed waste liquid preparation device (101), the filtrate outlet is connected with a filtrate tank, and an outlet of the filtrate tank is connected with a circulating cooling unit in the acid making system or an external coking desulfurization system;

preferably, the filtration device (102) comprises a plurality of membrane filtration devices arranged in parallel;

preferably, the membrane filtration device is a microporous filter;

preferably, the homogenizing device (104) comprises a colloid mill;

preferably, the homogenizing device (104) comprises a plurality of colloid mills arranged in series.

4. The system for producing acid using industrial sulfur-containing waste according to claim 2 or 3, wherein at least one of the mixed waste liquid production apparatus (101), the intermediate tank (103), and the sulfur slurry tank (105) is provided with a stirring element and a heating element;

preferably, the heating element comprises a heating pipeline, a heating medium is introduced into the heating pipeline, and more preferably, the heating medium comes from the dryer;

preferably, the outlet of the sulfur slurry groove (105) enters the feeding hole of the dryer through a hopper and a screw feeder; or the outlet of the sulfur pulp groove (105) is directly connected with the feed inlet of the dryer from top to bottom through a pipeline and naturally settles to the feed inlet of the dryer by means of gravity; or the outlet of the sulfur slurry tank (105) is connected with the feed inlet of the dryer through a delivery pump.

5. The system for producing acid by using industrial sulfur-containing waste according to any one of claims 1 to 4, wherein the cylinder (11) has a hollow inner cavity for containing sulfur slurry, and is provided with end caps at two ends, the rotating shaft (12) penetrates through the end caps at two ends, and a sealing structure is arranged between the rotating shaft (12) and the end caps;

preferably, the sealing structure is a dynamic sealing ring;

preferably, the top end of the barrel body (11) is connected with a barrel cover (54), and a viewing mirror (42) is arranged on the side wall of the barrel cover (54);

preferably, the dryer further comprises a motor (32) and a driving device (33), one end of the rotating shaft (12) close to the feeding hole (16) of the dryer is connected with the driving device (33), and the driving device (33) is connected with the motor (32);

preferably, a plurality of blades (34) are arranged on the rotating shaft (12), the blades (34) are uniformly arranged along the axial direction of the rotating shaft (12) at intervals, and a structure capable of pushing the sulfur slurry to move towards the discharge hole (17) of the dryer is formed between the blades (34) and the periphery of the rotating shaft (12);

preferably, the blade (34) is provided with a hollow inner cavity, and the inner cavity of the blade (34) is communicated with the inner cavity of the rotating shaft (12);

preferably, both ends of the rotating shaft (12) are respectively provided with a first inlet (14) and a first outlet (15); the side wall of the cylinder body (11) is provided with a plurality of second inlets (35) and second outlets (36), the second inlets (35) and the second outlets (36) are arranged along the axial direction of the cylinder body (11), the side wall of the cylinder body (11) is provided with a plurality of air cavities (37) along the axial direction, the air cavities (37) are hollow and independently sealed cavities, and each air cavity (37) is respectively communicated with the corresponding second inlet (35) and second outlet (36); the second inlet (35) and the first inlet (14) are communicated with a main pipeline (38), and a heating medium is introduced into the main pipeline (38);

more preferably, the second inlet (35) is connected in parallel with the first inlet (14) after being converged and is communicated with a main pipeline (38);

more preferably, the feed inlet (16) of the dryer is communicated with an air inlet (39), the outer side of the air inlet (39) is sequentially connected with a heater (40) and a filter (41), and a third inlet (52) of the heater (40) is communicated with the main pipeline (38);

more preferably, the second inlet (35) and the second outlet (36) are provided at the top and bottom of the barrel (11), respectively.

6. The system for producing acid using industrial sulfur-containing waste according to any one of claims 1 to 5, characterized in that

Characterized in that the rotating shaft (12) comprises a first rotating shaft (121) and a second rotating shaft (122) which are arranged in parallel along the axial direction of the cylinder body (11), and the rotating directions of the first rotating shaft (121) and the second rotating shaft (122) are opposite;

preferably, the blades (34) on the first rotating shaft (121) and the blades (34) on the second rotating shaft (122) are arranged in a staggered manner; the blades (34) comprise fan-shaped blade surfaces distributed along the circumferential direction of the rotating shaft (12), and the radian of each fan-shaped blade surface is not larger than the semicircle of the rotating shaft (12);

preferably, the end part of the blade (34) for stirring the sulfur slurry is provided with a scraping structure (66), and the scraping structure (66) extends along the axial direction of the rotating shaft (12) and can be contacted with the inner wall of the cylinder (11);

preferably, the pretreatment unit further comprises a processor, a temperature sensor and a pressure sensor, wherein the temperature sensor and the pressure sensor are located in the cylinder body (11), the temperature sensor and the pressure sensor are respectively connected with the processor, and the processor is respectively electrically connected with the motor (32) and the induced draft fan (28).

7. The system for producing acid using industrial sulfur-containing waste according to any one of claims 1 to 6, further comprising:

the waste heat boiler comprises an air inlet tower (43), an air outlet tower (44) and a closing plate (45), wherein the air inlet tower (43) is communicated with the air outlet tower (44), the air inlet tower (43) and the air outlet tower (44) are hermetically connected with the closing plate (45), an air inlet (46) is formed in the side wall of the air inlet tower (43), and an air outlet (47) is formed in the side wall of the air outlet tower (44); the side walls of the air inlet tower (43) and the air outlet tower (44) and the closing plate (45) are respectively provided with a hollow clamping cavity, cooling water is introduced into the hollow clamping cavities of the side walls of the air inlet tower (43) and the air outlet tower (44) and communicated with each other, the cooling water in the side walls converges into the closing plate (45), and the closing plate (45) is provided with a steam outlet (48);

the gas inlet (46) of the gas inlet tower (43) is filled with process gas, and the steam outlet (48) is communicated with the main pipeline (38);

the top of the air inlet tower (43) and the top of the air outlet tower (44) are provided with bottom plates (49) with downward concave structures, the closing plate (45) is provided with a drainage plate (50) which vertically extends downwards, the drainage plate (50) extends downwards into the concave structures of the bottom plates (49), the drainage plate (50) and the bottom plates (49) are both provided with hollow inner cavities, the inner cavities of the drainage plate (50) are communicated with the inner cavities of the closing plate (45), and the inner cavities of the bottom plates (49) are respectively communicated with the inner cavities of the side walls of the air inlet tower (43) and the air outlet tower (44);

a dust leakage hole (51) is formed in a downward sunken structure of the bottom plate (49), a valve device (53) is arranged at the dust leakage hole (51), the valve device (53) is set to be in a normally closed state, and the valve device (53) is changed to be in an openable state by means of the weight of accumulated dust;

preferably, the bottom plate (49) is V-shaped or U-shaped;

preferably:

the pretreatment unit also comprises a tail gas washing and recovering system;

the washing device is used for washing and cooling the tail gas discharged by the dryer, the gas inlet end of the washing device is connected with the tail gas discharge port (18), and part of washing mixed liquid generated by washing the tail gas is filtered and then supplied to the feed port of the dryer;

the acid washing device is connected with an air outlet of the water washing device and is used for neutralizing ammonia in the tail gas after water washing to generate ammonium sulfate mother liquor;

and the tail gas washing device is connected with the gas outlet of the acid washing device and is used for washing and cooling the tail gas after acid washing.

8. The system for producing acid by using industrial sulfur-containing waste as claimed in claim 7, wherein the outlet of the ammonium sulfate mother liquor of the acid washing device is connected with one or two of an ammonium sulfate production device or a pretreatment evaporation concentration system, the ammonium sulfate production device is used for producing the ammonium sulfate mother liquor into an ammonium sulfate product, and the outlet of the pretreatment evaporation concentration system is connected with the dryer;

preferably, the water washing device is a water washing tower (19), and the water washing tower (19) is provided with a cooling water inlet (23) and a water washing circulating pump branch (22);

the water washing circulation pump branch (22) comprises a first path communicated with the internal circulation of the water washing tower (19), a second path connected to the feed inlet of the dryer via a filtration bypass system (24);

the filtration bypass system (24) comprises a filter, and the outlet of the filter is connected with the feed inlet of the dryer;

the pickling device is a pickling tower (20), the pickling tower (20) is provided with a dilute acid branch (25) and a pickling circulating pump branch (26), the dilute acid branch (25) is connected with a dilute acid supply device, and the pickling circulating pump branch (26) comprises a third path communicated with the internal circulation of the pickling tower (20) and a fourth path connected with an ammonium sulfate mother liquor tank through an ammonium sulfate mother liquor bypass (27);

preferably, the dilute acid supply equipment is used for producing H₂SO₄Dynamic wave wash towers used in the system;

preferably, the gas outlet of the pickling device is connected to the tail gas washing device through an induced draft fan (28).

9. The method for preparing the acid by utilizing the industrial sulfur-containing waste is characterized by comprising a pretreatment process, wherein the pretreatment process comprises the following steps:

10. The method for preparing acid by using industrial sulfur-containing waste according to claim 9, wherein the step of preparing the sulfur slurry further comprises a water content adjusting process, and the water content adjusting process is at least one or more of the steps of preparing mixed waste liquid, preparing intermediate sulfur liquid by filtering the mixed waste liquid, or preparing the sulfur slurry by the intermediate sulfur liquid;

preferably, the acid making method further comprises a tail gas washing and recovering process, wherein the tail gas washing and recovering process comprises the following steps: