CN214973025U - Chemical tail gas treatment device for realizing ultralow emission of sulfur dioxide - Google Patents
Chemical tail gas treatment device for realizing ultralow emission of sulfur dioxide Download PDFInfo
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- CN214973025U CN214973025U CN202121157839.8U CN202121157839U CN214973025U CN 214973025 U CN214973025 U CN 214973025U CN 202121157839 U CN202121157839 U CN 202121157839U CN 214973025 U CN214973025 U CN 214973025U
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Abstract
The utility model relates to the field of chemical industry environmental protection, and discloses a chemical industry tail gas treatment device for realizing ultralow emission of sulfur dioxide, which comprises a draught fan, a heat exchanger, a cooling tower, an alkali liquor preparation tank, a proportioning pump, a washing tower, an alkaline washing pump, a waste liquor extraction pump, a waste liquor regeneration preparation tank, a static mixer, a pipeline and a valve; the above-mentionedThe lower part of the washing tower is provided with a packing layer, the middle part is provided with an annular liquid accumulating tank along the wall of the tower, the upper part is sequentially provided with a three-layer alkaline washing atomization spraying system and a two-layer water washing atomization spraying system, and the top is sequentially provided with a demister and a chimney. The utility model discloses a packing layer and three-layer alkali wash atomizing spraying system's joint alkali wash, two-layer water wash atomizing spraying system's powerful is washed, the defroster is got rid of the droplet, hot-air drives and purifies comprehensive technological means such as gas rising, makes the sulfur dioxide concentration control after the tail gas treatment at 5mg/m3Realizing ultralow emission of sulfur dioxide; and zero discharge of waste liquid is realized.
Description
Technical Field
The utility model relates to a chemical industry environmental protection trade exhaust-gas treatment field, concretely relates to realize chemical industry tail gas processing apparatus of ultralow emission of sulfur dioxide.
Background
The emission standard of tail gas generated after the sulfur recovery unit is incinerated in an incinerator is changed. For example: the invention patent with the publication number of CN101054165A and the name of 'a sulfur recovery and tail gas treatment device and a sulfur recovery and tail gas treatment method thereof' introduces that sulfur tail gas after a series of treatments reaches GB1629 'comprehensive emission Standard of atmospheric pollutants', and the requirement of the current emission index is lower, namely the content of sulfur dioxide in the waste gas is less than or equal to 960mg/m3. With the increasing improvement of the construction of the national ecological civilization, the special action plans of 'winning blue sky guard war' and the like are also steadily promoted, and according to GB31571-2015 discharge Standard of pollutants for petrochemical industry, the concentration of sulfur dioxide discharged by a process heating furnace is required to be controlled<100mg/m3. According to regional air pollutant comprehensive emission standard DB37/2376 and 2019 of Shandong province, a general control area for sulfur dioxide emission concentration of a heating furnace in petrochemical industry process is required<100mg/m3Emphasis on control area<50mg/m3. If the requirements are met, the tail gas at the outlet of the sulfur recovery unit incinerator needs to be treated, so that the tail gas meets the requirements of petrochemical industry pollutant emission standard GB31571-2015 and regional atmospheric pollutant comprehensive emission standard DB 37/2376-2019.
SUMMERY OF THE UTILITY MODEL
In order to solve the prior art problem, the utility model provides a chemical industry tail gas processing apparatus who realizes the ultralow emission of sulfur dioxide.
The technical scheme is as follows: the system comprises an induced draft fan, a heat exchanger, a cooling tower, an alkali liquor preparation tank, a proportioning pump, a washing tower, an alkaline washing pump, a water washing pump, a waste liquor extraction pump, a waste liquor regeneration pump, a cache tank containing a filter screen, a static mixer, a pipeline and a valve; the lower part of the washing tower is provided with a packing layer, the middle part of the washing tower is provided with an annular liquid accumulating tank along the wall of the washing tower, the upper part of the washing tower is sequentially provided with a three-layer alkaline washing atomization spraying system and a two-layer water washing atomization spraying system, and the top of the washing tower is sequentially provided with a demister and a chimney; the valves comprise a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a ninth valve, a tenth valve, an eleventh valve, a twelfth valve, a thirteenth valve, a fourteenth valve, a fifteenth valve, a sixteenth valve and a seventeenth valve; the pipelines comprise an air pipeline, a tail gas pipeline, an alkali liquor pipeline, a waste liquid pipeline, an alkali washing pipeline and a water washing pipeline; the tail end of the air pipeline is connected with a chimney of the washing tower, and a draught fan, a first valve, a heat exchanger and a second valve are sequentially connected in series on the pipeline; the tail end of the tail gas pipeline is connected to the side wall of the washing tower and is positioned below the packing layer, and the pipeline is sequentially connected with the heat exchanger, the third valve, the cooling tower and the fourth valve in series; the initial end of the alkali liquor pipeline is connected to the bottom of the alkali liquor preparation tank, the tail end of the alkali liquor pipeline is connected to the annular liquid accumulation tank of the washing tower, and a fifth valve, a static mixer, a proportioning pump and a sixth valve are sequentially connected in series on the pipeline; the initial end of the alkaline washing pipeline is connected with an annular liquid accumulating tank of the washing tower, an eleventh valve and an alkaline washing pump are sequentially connected in series on the pipeline, three branches respectively connected with the three layers of alkaline washing atomization spraying systems are constructed, and a twelfth valve, a thirteenth valve and a fourteenth valve are respectively arranged on the three branches; the initial end of the waste liquid pipeline is connected to the side wall of the lower part of the washing tower, the tail end of the waste liquid pipeline is connected to the alkali liquid pipeline and is positioned between the fifth valve and the static mixer, the pipeline is sequentially connected with the tenth valve, the waste liquid extraction pump, the ninth valve, the cache tank containing the filter screen, the eighth valve, the waste liquid regeneration pump and the seventh valve in series, a branch for installing the seventeenth valve is constructed between the tenth valve and the waste liquid extraction pump of the pipeline, and the tail end of the branch is connected to the alkali washing pipeline and is positioned between the eleventh valve and the alkali washing pump; and after a washing pump is installed on the pipeline of the washing pipeline, two branches respectively connected with the two layers of washing atomization spraying systems are constructed, and a fifteenth valve and a sixteenth valve are respectively installed on the two branches.
The above technical solution can be further optimized as follows:
the induced draft fan adopts axial fan.
The heat exchanger adopts an air heat exchanger.
The cooling tower adopts a water-cooled cooling tower.
The demister is a flat plate type demister consisting of two layers of parallel demister blades.
The packing layer adopts ceramic corrugated structured packing.
The pipeline and the valve are made of 316L stainless steel.
The utility model discloses mainly have following advantage:
1. the method ensures the fastest tail gas desulfurization speed and the maximized desulfurization degree by the comprehensive technical means of combined alkali washing of a packing layer and a three-layer alkali washing atomization spraying system, powerful washing of a two-layer water washing atomization spraying system, mist drop removal of a demister, ascending of purified gas driven by hot air and the like from bottom to top in a washing tower, and controls the concentration of sulfur dioxide after tail gas treatment to be 5mg/m3 In the following, ultra-low emission of sulfur dioxide is achieved.
2. Sodium lye is adopted as absorption liquid, so that the problems of scaling and slurry blockage are avoided; the absorption rate of the sodium salt is higher than that of the calcium salt, and the required liquid-gas ratio is much lower, so that the power consumption can be saved.
3. The sodium-alkali absorption waste liquid is regenerated and recycled, and zero discharge of the waste liquid is realized.
4. The device is safe and reliable, the process flow is reasonable, the operation is simple and convenient, and the switching operation of various working conditions can be easily realized.
Drawings
Fig. 1 is a basic structure layout and a basic process flow diagram of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following examples.
Example 1
See fig. 1. The utility model provides a realize chemical industry tail gas processing apparatus of sulfur dioxide minimum discharge, includes draught fan, heat exchanger, cooling tower, alkali lye preparation jar, proportioning pump, scrubbing tower, alkali wash pump, washing pump, waste liquid pumper, waste liquid regeneration pump, waste liquid regeneration preparation jar, static mixer, pipeline and valve. The lower part of the washing tower is provided with a packing layer, the middle part is provided with an annular liquid accumulating tank along the wall of the tower, the upper part is sequentially provided with a three-layer alkaline washing atomization spraying system and a two-layer water washing atomization spraying system, and the top is sequentially provided with a demister and a chimney. The valves comprise a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a ninth valve, a tenth valve, an eleventh valve, a twelfth valve, a thirteenth valve, a fourteenth valve, a fifteenth valve, a sixteenth valve and a seventeenth valve. The pipelines comprise an air pipeline, a tail gas pipeline, an alkali liquor pipeline, a waste liquid pipeline, an alkali washing pipeline and a water washing pipeline. The tail end of the air pipeline is connected to a chimney of the washing tower, and the pipeline is sequentially connected with the draught fan, the first valve, the heat exchanger and the second valve in series. The tail end of the tail gas pipeline is connected to the side wall of the washing tower and located below the packing layer, and the heat exchanger, the third valve, the cooling tower and the fourth valve are sequentially connected in series on the pipeline. The initial end of the alkali liquor pipeline is connected to the bottom of the alkali liquor preparation tank, the tail end of the alkali liquor pipeline is connected to the annular liquid accumulating tank of the washing tower, and the pipeline is sequentially connected with the fifth valve, the static mixer, the proportioning pump and the sixth valve in series. The initial end of the alkaline washing pipeline is connected with an annular liquid accumulating tank of the washing tower, an eleventh valve and an alkaline washing pump are sequentially connected in series on the pipeline, three branches respectively connected with the three layers of alkaline washing atomization spraying systems are constructed, and a twelfth valve, a thirteenth valve and a fourteenth valve are respectively installed on the three branches. The initial end of the waste liquid pipeline is connected to the side wall of the lower part of the washing tower, the tail end of the waste liquid pipeline is connected to the alkali liquid pipeline and is positioned between the fifth valve and the static mixer, the tenth valve, the waste liquid extraction pump, the ninth valve, the waste liquid regeneration preparation tank, the eighth valve, the waste liquid regeneration pump and the seventh valve are sequentially connected in series on the pipeline, a branch for installing the seventeenth valve is constructed between the tenth valve and the waste liquid extraction pump of the pipeline, and the tail end of the branch is connected to the alkali washing pipeline and is positioned between the eleventh valve and the alkali washing pump. And after a washing pump is installed on a pipeline of the washing pipeline, two branches respectively connected with the two layers of washing atomization spraying systems are constructed, and a fifteenth valve and a sixteenth valve are respectively installed on the two branches.
Example 2
See fig. 1. The utility model provides a realize chemical industry tail gas processing apparatus of sulfur dioxide minimum discharge, on the technical scheme basis that embodiment 1 recorded, the draught fan adopts axial fan. The axial flow fan is simple in structure, convenient to install, good in air inducing effect and high in safety, and air flows in parallel to the fan shaft.
Example 3
See fig. 1. A chemical tail gas treatment device for realizing ultralow emission of sulfur dioxide is characterized in that on the basis of the technical scheme recorded in embodiment 1, an air heat exchanger is adopted as a heat exchanger to facilitate heat exchange between hot tail gas and cold air, so that the entering cold air is changed into hot air; the cooling tower adopts a water-cooled cooling tower, and water is used as a circulating coolant to cool the tail gas.
Example 4
See fig. 1. The utility model provides a realize chemical industry tail gas processing apparatus of ultralow emission of sulfur dioxide, on the technical scheme basis that embodiment 1 recorded, the defroster adopts flat defroster. The flat plate type demister consists of two layers of parallel demister blades, wherein the first layer of demister blades removes coarse particle fog drops, and the second layer of demister blades removes fine particle fog drops.
Example 5
See fig. 1. A chemical tail gas treatment device for realizing ultralow emission of sulfur dioxide is characterized in that a packing layer is a ceramic corrugated structured packing on the basis of the technical scheme recorded in embodiment 1. The ceramic filler has good surface wettability, corrosion resistance and heat resistance, and is cheap; in addition, the surface of the ceramic structured packing is smoother, and the liquid can more rapidly circulate in the ceramic structured packing.
Example 6
See fig. 1. On the basis of the technical scheme recorded in embodiment 1, the pipeline and the valve are made of 316L stainless steel so as to enhance the corrosion resistance and prolong the service life of the chemical tail gas treatment device.
The basic process flow and the principle of sulfur dioxide absorption in sulfur tail gas of the utility model are briefly introduced as follows:
the sulfur tail gas exchanges heat with air through a heat exchanger, is cooled through a cooling tower and then enters a washing tower; alkali liquor is mixed by a static mixer and then conveyed to an annular liquid accumulating tank of the washing tower by a proportioning pump, and then conveyed to a three-layer alkali washing atomization spraying system of the washing tower from the annular liquid accumulating tank of the washing tower by an alkali washing pump; fresh water is conveyed to a two-layer washing atomization spraying system of the washing tower through a washing pump; in the packing layer of the washing tower, the alkali liquor film and the rising tail gas are in reverse gas-liquid contact, and sulfur dioxide in the tail gas is absorbed and converted in a first round; after the three-layer alkali washing atomization spraying system of the washing tower operates, descending alkali liquor fog drops and ascending tail gas are in reverse gas-liquid contact, and sulfur dioxide in the tail gas is absorbed and converted in a second round; after the two-layer washing atomization spraying system of the washing tower operates, the water mist washes and removes dust for the rising tail gas; at the position of a demister of the washing tower, fog drops contained in the rising tail gas are removed, and the tail gas is changed into purified gas; at the chimney position of the washing tower, the purified gas is driven to rise by the hot air which has fully absorbed heat through the heat exchanger and is discharged from the chimney; the waste liquid flows out from the lower part of the washing tower, is transported to a waste liquid regeneration preparation tank through a waste liquid extraction pump, and is transported to an alkali liquor pipeline for recycling after being regenerated by adding alkali.
Sulfur dioxide in tail gas at an outlet of an incinerator of the sulfur recovery unit enters a washing tower and is sequentially subjected to first round absorption and conversion of an alkali liquor film generated by a packing layer and second round absorption and conversion of alkali liquor fog drops generated by a three-layer alkali washing atomization spraying system; almost all sulfur dioxide in the sulfur tail gas is absorbed and converted after two rounds of absorption and conversion. In the initial stage of operation, sodium hydroxide and sulfur dioxide captured from the sulfur tail gas are subjected to chemical reaction to generate sodium sulfite. With the generation of sodium sulfite, the sodium sulfite also reacts with sulfur dioxide to generate sodium bisulfite. However, sodium bisulfite is an acid salt that does not have an absorbing capacity for sulfur dioxide. As the operation continues, the amount of sodium bisulfite in the absorption liquid gradually increases, and the absorption capacity of the absorption liquid gradually decreases. Then, a seventeenth valve on a branch of the waste liquid pipeline leading to the alkaline washing pipeline is closed, and the waste liquid at the lower part of the washing tower is conveyed to a waste liquid regeneration preparation tank through a waste liquid extraction pump; adding fresh sodium hydroxide solution into the waste liquid regeneration preparation tank, and reacting the fresh sodium hydroxide solution with sodium bisulfite in the waste liquid to generate sodium sulfite with absorption capacity, namely recovering the absorption capacity of the waste liquid to obtain regeneration. The regenerated waste liquid is transferred to an alkali liquor pipeline through a waste liquid regeneration pump, and is mixed by a static mixer and then is pumped into a washing tower through a proportioning pump for recycling.
The specific reaction equation is as follows:
2NaOH+SO2→Na2SO3+H2O
Na2SO3+SO2+H2O→2NaHSO3
NaHSO3+NaOH→Na2SO3+H2O
the production practice proves that even the sulfur tail gas at the outlet of the incinerator has the sulfur dioxide concentration of 400mg/m3 Under the above conditions, the sulfur dioxide concentration can be reduced to 5mg/m after the treatment of the process of the invention3Realizing ultralow emission of sulfur dioxide; the sodium-alkali absorption waste liquid is regenerated and recycled, and zero discharge of the waste liquid is realized.
Claims (7)
1. The utility model provides a realize chemical industry tail gas processing apparatus of ultralow emission of sulfur dioxide which characterized in that: the system comprises an induced draft fan, a heat exchanger, a cooling tower, an alkali liquor preparation tank, a proportioning pump, a washing tower, an alkaline washing pump, a water washing pump, a waste liquor extraction pump, a waste liquor regeneration pump, a cache tank containing a filter screen, a static mixer, a pipeline and a valve; the lower part of the washing tower is provided with a packing layer, the middle part of the washing tower is provided with an annular liquid accumulating tank along the wall of the washing tower, the upper part of the washing tower is sequentially provided with a three-layer alkaline washing atomization spraying system and a two-layer water washing atomization spraying system, and the top of the washing tower is sequentially provided with a demister and a chimney; the valves comprise a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a ninth valve, a tenth valve, an eleventh valve, a twelfth valve, a thirteenth valve, a fourteenth valve, a fifteenth valve, a sixteenth valve and a seventeenth valve; the pipelines comprise an air pipeline, a tail gas pipeline, an alkali liquor pipeline, a waste liquid pipeline, an alkali washing pipeline and a water washing pipeline; the tail end of the air pipeline is connected with a chimney of the washing tower, and a draught fan, a first valve, a heat exchanger and a second valve are sequentially connected in series on the pipeline; the tail end of the tail gas pipeline is connected to the side wall of the washing tower and is positioned below the packing layer, and the pipeline is sequentially connected with the heat exchanger, the third valve, the cooling tower and the fourth valve in series; the initial end of the alkali liquor pipeline is connected to the bottom of the alkali liquor preparation tank, the tail end of the alkali liquor pipeline is connected to the annular liquid accumulation tank of the washing tower, and a fifth valve, a static mixer, a proportioning pump and a sixth valve are sequentially connected in series on the pipeline; the initial end of the alkaline washing pipeline is connected with an annular liquid accumulating tank of the washing tower, an eleventh valve and an alkaline washing pump are sequentially connected in series on the pipeline, three branches respectively connected with the three layers of alkaline washing atomization spraying systems are constructed, and a twelfth valve, a thirteenth valve and a fourteenth valve are respectively arranged on the three branches; the initial end of the waste liquid pipeline is connected to the side wall of the lower part of the washing tower, the tail end of the waste liquid pipeline is connected to the alkali liquid pipeline and is positioned between the fifth valve and the static mixer, the pipeline is sequentially connected with the tenth valve, the waste liquid extraction pump, the ninth valve, the cache tank containing the filter screen, the eighth valve, the waste liquid regeneration pump and the seventh valve in series, a branch for installing the seventeenth valve is constructed between the tenth valve and the waste liquid extraction pump of the pipeline, and the tail end of the branch is connected to the alkali washing pipeline and is positioned between the eleventh valve and the alkali washing pump; and after a washing pump is installed on the pipeline of the washing pipeline, two branches respectively connected with the two layers of washing atomization spraying systems are constructed, and a fifteenth valve and a sixteenth valve are respectively installed on the two branches.
2. The chemical tail gas treatment device for realizing ultralow emission of sulfur dioxide according to claim 1, characterized in that: the method is characterized in that: the induced draft fan adopts axial fan.
3. The chemical tail gas treatment device for realizing ultralow emission of sulfur dioxide according to claim 1, characterized in that: the heat exchanger adopts an air heat exchanger.
4. The chemical tail gas treatment device for realizing ultralow emission of sulfur dioxide according to claim 1, characterized in that: the cooling tower adopts a water-cooled cooling tower.
5. The chemical tail gas treatment device for realizing ultralow emission of sulfur dioxide according to claim 1, characterized in that: the demister is a flat plate type demister consisting of two layers of parallel demister blades.
6. The chemical tail gas treatment device for realizing ultralow emission of sulfur dioxide according to claim 1, characterized in that: the packing layer adopts ceramic corrugated structured packing.
7. The chemical tail gas treatment device for realizing ultralow emission of sulfur dioxide according to claim 1, characterized in that: the pipeline and the valve are made of 316L stainless steel.
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| CN202121157839.8U CN214973025U (en) | 2021-05-27 | 2021-05-27 | Chemical tail gas treatment device for realizing ultralow emission of sulfur dioxide |
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| CN202121157839.8U CN214973025U (en) | 2021-05-27 | 2021-05-27 | Chemical tail gas treatment device for realizing ultralow emission of sulfur dioxide |
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