50results about How to "Avoid Dew Point Corrosion" patented technology

The invention discloses a wet method used for preparing sulfuric acid from exhaust gas containing hydrogen sulfide, and belongs to the technical field of waste gas treatment in environmental protection industry and chemical production. The wet method comprises following steps: removal of nitrogen compounds of the exhaust gas containing hydrogen sulfide is realized using dilute sulphuric acid with a mass fraction of 30 to 50%; the treated exhaust gas containing hydrogen sulfide is delivered into an incinerator, preheated air is added so as to maintain a combustion temperature of 700 to 1000 DEG C and a reducing/oxidizing atmosphere, so that sufficient burning of hydrogen sulfide and other combustible components is realized, and generation amount of nitrogen oxide is reduced; high temperature gas at an incinerator outlet is delivered into a medium pressure waste heat boiler so as to recycle heat energy and byproduct saturated vapour; flue gas containing sulfur dioxide at a waste heat boiler outlet is delivered directly into a converter, and flue gas containing sulfur trioxide and vapour is obtained via primary conversion; reaction heat in the converter is removed in time using heat-exchange equipment; flue gas at a converter outlet is delivered into at least primary-stage condenser tube pass, and an appropriate amount of air is delivered into condenser shell pass to be used as a cooling medium; heat energy of high temperature concentrated sulfuric acid flows out from the bottom of the condenser is recycled via a desalting water preheater and an acid cooler; and exhaust gas at a condenser outlet is delivered into a desulfurization tower so as to remove sulfur dioxide and nitrogen oxides.

The invention provides a liquid-phase dechlorinating method for chlorine-contained alkalate oil. The method comprises the following steps: (1) liquid phase hydrogenation: under hydrogenation condition, enabling chlorine-contained alkalate oil in a liquid phase state to react with hydrogen and a hydrogenation catalyst to generate a hydrogenated product containing HCl; (2) liquid phase adsorption: contacting the hydrogenated product containing the HCl in a liquid phase state with an adsorbent and obtaining the hydrogenated product with the HCl removed after the HCl is adsorbed; (3) oil and gas separation: separating the hydrogenated product with the HCl removed from hydrogen and obtaining the dechlorinated alkalate oil. The synthesizing method utilizes liquid-phase hydrogenation, has moderate operation conditions and low hydrogen-oil ratio, avoids arranging equipment of hydrogenating furnaces, feeding furnaces, heating furnaces and the like, reduces investment and operation cost of devices and can achieve complete conversion of organic chloride.

The invention discloses a high-efficiency sulfur recovery method of hydrogen sulfide containing waste gas. The high-efficiency sulfur recovery method is characterized in that the H2S containing waste gas is completely burned in an incinerator to generate SO2 gas and water vapor, then the SO2 gas and the water vapor are cooled through a waste heat boiler to generate process gas with the temperature of 300 DEG C-500 DEG C, and simultaneously, the 7.0-7.5 MPa high-pressure gas is generated; the process gas enters an oxidation reactor with a reaction section and a cooling section and is catalyzed and oxidized in the oxidation reactor to generate SO3 which is converted into sulfuric acid vapor; the sulfuric acid vapor enters a cooler and is cooled by air when the temperature of the sulfuric acid vapor is above 250 DEG C, so that sulfuric acid liquid and non-condensable gas are generated; the non-condensable gas is subjected to multistage heating, and then is subjected to secondary catalytic oxidation and secondary cooling separation, the non-condensable gas reaching the emission standards is discharged, and the sulfuric acid liquid separated out is collected. The high-efficiency sulfur recovery method has the advantages that the corrosion on production equipment can be avoided, the technology practicability is ensured, the heat is stepwise used according to the difference of liquid levels, and the utilization rate of heat is high.

The invention relates to a tail gas treatment system for waste salt recycling treatment. The tail gas treatment system comprises a two-time combustion chamber, a waste heat boiler, a quench tower, a bag dust collector, a precooler, a two-stage washing tower, a white flue gas elimination device, a chimney and a circulating water tank, wherein the two-time combustion chamber comprises an input end and a flue gas output end, the input end of the two-time combustion chamber comprises a natural gas input end, a pyrolysis gas input end and an ammonium hydroxide input end, the natural gas input end is connected with natural gas, the natural gas can be input into the two-time combustion chamber through the natural gas input end, the pyrolysis gas input end of the two-time combustion chamber is connected with pyrolysis waste gas of a pyrolyzing furnace, the ammonium hydroxide input end is connected with ammonium hydroxide, and the ammonium hydroxide can be input into the two-time combustion chamber through the ammonium hydroxide input end. The tail gas treatment system for the waste salt recycling treatment has the advantages that the connection of the structure is simple, the use is convenient, after the pyrolysis waste gas in the pyrolyzing furnace is treated, pollutants in flue gas can completely meet emission standards, the cost is low, the effect is good, and the system can be applied in the waste salt recycling treatment.

The invention discloses a method for purifying an exhaust gas containing a hydrogen chloride gas and an organic chlorine compound gas. The method comprises the following steps: introducing a mixed gasof exhaust gas and air into a graphite preheater for preheating; exchanging heat and rising temperature by introducing a high-temperature gas from a shell side of a heat exchanger A and a fixed bed reactor; introducing the mixed gas into the fixed bed reactor for catalytic oxidation reaction; introducing high-temperature gas after reaction into a tube pass of the heat exchanger A, exchanging heatand cooling; introducing the cooled gas into a spraying washer for absorbing an acidic gas, and then introducing into a gas-liquid separator and directly discharging the gas. According to the invention, the method for catalytic oxidation by using the fixed bed reactor is adopted for efficiently low-cost treating the exhaust gas containing the hydrogen chloride gas and the organic chlorine compound gas; the graphite preheater is adopted for preheating the mixed gas, so that the dew point corrosion of HCl gas to the pipeline and the heat exchanger can be reduced; the high-temperature exhaust gas after catalytic oxidation exchanges heat with the to-be-treated exhaust gas through the heat exchanger, so that reaction heat can be fully utilized; the method has higher economic benefits.

The invention discloses a hydrogenation corrosion inhibitor. The hydrogenation corrosion inhibitor is prepared from the following components by mass: 8-12 percent of water-soluble quaternary ammoniumsalt, 1-5 percent of dispersant, 2-5 percent of monoethanolamine, 4-10 percent of water-soluble imidazoline compound, 1-5 percent of alkynol compound, 4-15 percent of nitrogen-containing adsorption corrosion inhibitor, and the balance of water. The synergistic effect of all the components of the hydrogenation corrosion inhibitor disclosed by the invention can significantly reduce acidic corrosioninhibition, and simultaneously reduce the amount of the hydrogenation corrosion inhibitor. Moreover, the hydrogenation corrosion inhibitor does not contain metals that are harmful to a catalyst, a pHvalue is 9-11, and a mechanical impurity is less than or equal to 0.08 percent.

The invention relates to a united acid manufacturing method by utilizing sulfuretted hydrogen and sulphur. The method is characterized in that in a united acid manufacturing production process by utilizing the sulfuretted hydrogen and the sulphur, a fire-tube boiler is adopted at a third section of outlet of a converter and behind an intermediate temperate superheater; the evaporating pressure of the boiler is controlled to be 5.1-5.6Mpa, and the saturation temperature is 265-271 DEG C, the inner wall temperature of a fire tube is improved, and the temperature of the fire tube wall is 265.5-271.4 DEG C, so that the condition that the temperature of the fire tube wall is higher than the dew point temperature of sulfuric acid in the gas is guaranteed, and the dew point temperature in a whole sulfuretted hydrogen working condition is 263 DEG C, so that the dew point corrosion is avoided; meanwhile, two acid manufacturing working conditions of a wet method and a dry method are considered, two fire tube boilers are adopted to be connected in series for operation; when the acid is manufactured by the wet method, the pressure of the two boilers is controlled to be 5.1-5.6Mpa; when the acid is manufactured by a dry method, the dew point of the sulfuric acid in the gas is about 155 DEG C according to the test of the dew point of the sulfuric acid in gas; the two boilers are separated to operate; the pressure of the first boiler is controlled to be 4.0-4.8Mpa; the pressure of the second boiler is controlled to be 1.0-1.8Mpa; and low-pressure steam is directly produced, and the heat is further recovered. With the adoption of the method provided by the invention, the dew point corrosion is avoided, and the use efficiency of process equipment is greatly improved.

The invention discloses an application of a gas-filled heat pipe in avoiding the dew point corrosion of a heat pipe exchanger. The gas-filled heat pipe comprises an evaporation segment and a condensation segment filled with a work substance. The application is characterized in that the condensation segment is also simultaneously filled with inert gases or nitrogen gas according to specified length and specified quantity of filled gases and can be filled with a mixture combined by gas molecules and the steam molecule of the work substance. The filled inert gases can automatically change occupied volume and filled gas length so as to change and adjust the temperature in the pipe and wall surface temperature, thus achieving the purpose of avoiding the dew point corrosion of the heat pipe.

The invention relates to a bidirectional internal sealing structure of a mechanical vibrator. The bidirectional internal sealing structure of the mechanical vibrator comprises a spring, a piston and a Y-shaped sealing ring, wherein the piston is arranged on one side of the spring and is in tight contact connection with the spring; an annular groove and a rectangular groove are formed on the piston; the Y-shaped sealing ring is arranged in the rectangular groove of the piston; the Y-shaped sealing ring is a bidirectional Y-shaped sealing ring consisting of two Y-shaped sealing rings; directions of lips of the two Y-shaped sealing rings are opposite; and the bidirectional Y-shaped sealing ring is sealed at the piston to achieve a bidirectional self-sealing effect, so as to improve a sealing effect of the bidirectional Y-shaped sealing ring between the piston and a piston sleeve. The bidirectional internal sealing structure of the mechanical vibrator has the main advantages that: the bidirectional Y-shaped sealing ring, a piston ring, the spring and other components act together to form a high-efficiency internal sealing system, so that the internal sealing performance of the mechanical vibrator is effectively improved and the service life of the mechanical vibrator is prolonged.

The invention relates to a device and process for utilizing waste heat of waste flue gas of a hot-blast stove. The process is characterized by comprising the steps that during normal operation, the waste flue gas sequentially enters secondary heat exchangers and primary heat exchangers through flue gas pipelines, and gas passing through the heat exchangers is preheated; when the temperature of the flue gas is higher than a design value, the amount of the flue gas entering the heat exchangers is controlled by adjusting regulating valves of the flue gas pipelines and inlets of the heat exchangers; and when the temperature of the flue gas is lower than the design value, the procedure includes the following steps that a, the valves arranged on the flue gas pipelines at the front ends of the heat exchangers are adjusted, and the amount of the flue gas entering the secondary heat exchangers is controlled; b, valves on bypass pipelines of the primary heat exchangers are opened, and the flue gas passing through the secondary heat exchangers are made to directly enter the flue gas pipelines at the rear ends of the primary heat exchangers by bypassing the primary heat exchangers; and c, the gas to be preheated sequentially enters the primary heat exchangers and the secondary heat exchangers and then enters bypass channels enabling outlets of the secondary heat exchangers and the inlets of the primary heat exchangers to be communicated, and therefore the temperature of the gas at the inlets of the primary heat exchangers is increased.

The invention belongs to the technical field of chemical industry production and is suitable for waste heat utilization of a waste sulfuric acid cracking treatment device using organic waste sulfuric acid as a raw material. The waste sulfuric acid cracking treatment device comprises a waste heat cracking furnace, a furnace gas cooler, an air fan, heat exchange equipment and a SO2 treatment system. High-temperature flue gas enters the furnace gas cooler after coming out from the waste heat cracking furnace and enters the SO2 treatment system after being cooled by cold air, the cold air is divided into two streams after being heated in the furnace gas cooler, one stream enters the waste heat cracking furnace to support combustion of fuel, and the other stream heats a cold medium for a user to use. Waste heat utilization of the waste heat cracking furnace is realized, and safety and stability in running of the device are greatly improved.

The invention discloses a hot gas comprehensive purification device for preventing the dew point corrosion at a boiler tail, which comprises a purification device body and an inclined partition plate.The tail heating surface is divided by the inclined partition plate into an upper chamber and a lower chamber which are independent from each other. The purification device body is internally and sequentially provided with an SCR denitration layer, a soda lime desulfurization layer, a secondary air preheater and a super absorbent resin layer from top to bottom. The purification device body is communicated with the upper chamber through an air inlet pipeline and is communicated with the lower chamber through an air outlet pipeline. A dust collecting groove, a dust removing net and a primary air preheater are arranged in the air inlet pipeline, and ultrasonic dust removers are arranged on the outer walls of the air inlet pipeline and the purification device body.According to the hot gas comprehensive purification device, the dust removal net and the three purification layers are used for reducing the contents of large-particle dust, nitrogen oxide compounds, sulfur oxide compounds and water vapor in the hot gas at the boiler tail, so that the occurrence of the dew point corrosion of a low-temperature heating surface at the boilertail is avoided, and the abrasion of dust particles onthe outer wall of an air preheater pipeline and dust deposition are slowed down.

The invention provides a method for measuring the flow of high-temperature highly corrosive flue gas. The method includes the following steps: 1), installing a Venturi flowmeter on a high temperature flue gas pipeline firstly, introducing the high-temperature flue gas into the Venturi flowmeter, and regulating the temperature of the high-temperature flue gas in a pressure measuring tube on the Venturi flowmeter to 100-180 DEG C; 2) measuring the temperature T and the pressure intensity P of the high-temperature flue gas entering the Venturi flowmeter, and measuring the differential pressure delta P of the Venturi flowmeter; 3) based on the temperature T, the pressure intensity P and the differential pressure delta P of the Venturi flowmeter, obtaining the actual flow Q1of the flue gas (please see the formula defined in the specification), and converting the Q1 into a flow value Q0 in the standard condition, wherein K refers to the flow coefficient of the Venturi flowmeter. The method is based on the properties of high-temperature highly corrosive flue gas, a radiator is adopted for cooling or a ribbon heater is adopted for thermal insulation, it is guaranteed that the flue gas in the pressure measuring tube reaches an appropriate temperature, dew point corrosion caused by the flue gas is prevented, the condensation droplet high-temperature gasification cycle is prevented, pressure fluctuation is avoided, and it is ensured that the measurement process is reliable and stable and the measurement is accurate.

The invention relates to a determination apparatus for the dew point of gas. The apparatus comprises an enclosed transparent cup and a copper cup inserted into the transparent cup; a gap is provided between the bottom of the copper cup and the bottom of the transparent cup, a gas inlet pipe and a gas outlet pipe are arranged on the transparent cup, the upper end of the copper cup is provided with an opening, and an acetone solution, dry ice and a mercury thermometer are provided in the copper cup. According to the invention, gas to be determined is blown into the transparent cup through the gas inlet pipe; dry ice is added into the acetone solution in the copper cup and is continuously stirred by using the mercury thermometer so as to allow temperature of the copper cup to decrease; when the temperature decreases to the dew point of the gas to be determined, condensable acid mist begins to coagulate and forms fine dew on the external surface of the copper cup, which enables the acid mist to lose its original luster, and temperature displayed by the mercury thermometer at the time is the dew point of the gas; through control of temperature of a heat exchanger, the service life of equipment can be prolonged, and dew point corrosion is prevented.