CN103711534B - Recovery method for low temperature exhaust heat of dimethyl ether production system - Google Patents
Recovery method for low temperature exhaust heat of dimethyl ether production system Download PDFInfo
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- CN103711534B CN103711534B CN201310695376.4A CN201310695376A CN103711534B CN 103711534 B CN103711534 B CN 103711534B CN 201310695376 A CN201310695376 A CN 201310695376A CN 103711534 B CN103711534 B CN 103711534B
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Abstract
The invention relates to a recovery method for low temperature exhaust heat of a dimethyl ether production system and belongs to the technical fields of energy saving, environmental protection and comprehensive utilization in industrial production. The recovery method comprises the following technical scheme of exchanging heat by using a low-boiling point liquid working medium and low temperature reaction gas of the dimethyl ether production system to make the low-boiling point liquid working medium evaporate into high pressure working medium steam to drive a generator to do work and generate power, wherein the heat of the reaction gas is transmitted to the low temperature liquid working medium, and then the temperature drops; directly supplying a gas-liquid mixture to a coarse dimethyl ether distillation process after the reaction gas is changed from high temperature gas into the low temperature gas-liquid mixture. According to the recovery method, cooling medium consumption and cooling energy consumption in the coarse dimethyl ether process are completely avoided, a great amount of low temperature exhaust heat is converted into electric power with high added value, and the electric power of a dimethyl ether production device can be self-sufficient or more than self-sufficient. Compared with the prior art, the recovery method is characterized in that the cooling medium consumption and cooling energy consumption of coarse dimethyl ether are reduced by 100 percent, the heat recovery efficiency of a methanol dehydration dimethyl ether production system is improved by 5 to 15 percent, and each ton of dimethyl ether byproduct electric power is 30 to 60 kwh.
Description
Technical field
The present invention relates to a kind of recovery method of low temperature exhaust heat of dimethyl ether production system, belong to industrial production energy-saving and environmental protection, technical field of comprehensive utilization.
Background technique
At field of industrial production, the heat of less than 150 DEG C media is referred to as low temperature exhaust heat, the low temperature exhaust heat of a large amount of less than 150 DEG C is there is at all types of industries production field, because not having suitable recovery method and low-temperature dew point corrosion problem to be difficult to the reasons such as solution, there is very large technical barrier in the recovery of this part low temperature exhaust heat at present, methanol vapor phase catalytic dehydration production dimethyl ether device is mainly divided into methanol gasifying, DME synthesis, three parts such as thick dimethyl ether rectifying, methanol gasifying and thick dimethyl ether rectifying need a large amount of heats, methanol dehydration dimethyl ether synthesis is exothermic reaction, release amount of heat, the pressure of whole system is 0.7-1.6MPa(absolute pressure), traditional residual heat of reaction recovery method is the reaction gas preheating material gas adopting higher temperature, heating or gasified methanol, the thick dimethyl ether of preheating etc., condensation of gas is the liquid of 30-40 DEG C by the method for the heat employing cooling of about remaining 80-120 DEG C reaction gas, direct or indirect by transfer of heat in air, cause the significant wastage of the energy, what have reclaims low temperature exhaust heat by the method for the hot water of by-product 60-80 DEG C, the employing also had is paid the method for producing 0.2MPa low-pressure steam and is reclaimed low temperature exhaust heat, as described in China Patent No. 200810054951.1, the subject matter existed: one is the water that methanol vapor phase catalytic dehydration produces that dimethyl ether that the reaction of dimethyl ether often produces 1 mole will produce 1 mole, by the moisture content of material benzenemethanol, the impact of catalyst activity and molecular balance, the conversion ratio of methyl alcohol is generally 75-90%, part methyl alcohol can not participate in reaction, reaction gas is dimethyl ether, water, the mixture of methyl alcohol, and the ratio that water accounts for is very large, be about 35-50%(molar percentage), unreacted methyl alcohol accounts for 10-25%(molar percentage), water, methyl alcohol and dimethyl ether are gaseous state in pyroreaction gas, in low-temp reaction gas, the overwhelming majority is gaseous state, therefore the low temperature exhaust heat overwhelming majority of reaction gas is heat of phase change, ratio shared by sensible heat is less, 0.7-1.6MPa(absolute pressure) under pressure, reaction gas drops to 60 DEG C of most vaporous waters by 120 DEG C and gaseous methanol will be condensed into liquid, a large amount of heat of condensation to be discharged in the process of condensation, the a large amount of cooling medium of consumption and power is needed to be removed by heat, often produce 1 ton of dimethyl ether, only the thick dimethyl ether Mixed Gas Condensation of 80-120 DEG C is the liquid of 30-40 DEG C, the consumption of recirculated cooling water is up to 30-60m3, two is the purposes adopting the method for by-product 0.2MPa low-pressure steam recovery waste heat will consider low-pressure steam, and simultaneously because the temperature of low-pressure steam self is higher, generally more than 100 DEG C, heat recovery efficiency is difficult to improve, adopt the method for by-product hot water to improve waste heat recovery rate, but the temperature of hot water is lower, the taste of heat recovery is lower, is difficult to reasonably be utilized, and adopts by-product Recovery of the hot water low temperature exhaust heat can realize in theory, but is difficult to realize industrialization operation.The device overwhelming majority of existing producing dimethyl ether by dehydrating methanol still adopts traditional heat recovery method, and the heat recovery efficiency of system is about 50-65%, and cooling water consumption is large, energy consumption high and low temperature waste heat serious waste phenomenon.
Summary of the invention
The object of this invention is to provide a kind of recovery method of low temperature exhaust heat of dimethyl ether production system, with specific low boiling working fluid for medium, by the low-temp reaction gas heat exchange of low boiling liquid refrigerant and dimethyl ether production system, low boiling liquid refrigerant is evaporated, produce the mechanical part acting drive electrical generators generating that the working substance steam with elevated pressures promotes power generation system, by the most vaporous waters in low-temp reaction gas while reducing reaction gas temperature, gaseous methanol and part gaseous dimethyl are condensed into liquid state, the cooled medium of low-temp reaction gas is gas-liquid mixture, directly deliver to thick dimethyl ether rectification working process, fully phase out the cooling energy consumption of reaction gas, reaction gas low temperature exhaust heat is converted into the electric power of high added value, realize the recycling of low temperature exhaust heat, reach energy-conservation, consumption reduction, environmental protection, the object of synergy.
The object of the present invention is achieved like this:
A kind of recovery method of low temperature exhaust heat of dimethyl ether production system, comprise following process step: 1. low boiling liquid refrigerant vaporizer is set, at the methyl alcohol heater of dimethyl ether production system reaction gas or the outlet of methanol evaporator, low boiling liquid refrigerant vaporizer is set, 0.7-1.6MPa absolute pressure, the low-temp reaction gas of 90-150 DEG C enters low boiling liquid refrigerant vaporizer, low boiling liquid refrigerant and reaction gas heat exchange are evaporated to more than 0.5MPa absolute pressure, the gas working medium of 80-120 DEG C, reaction gas is cooled to the gas-liquid mixture of 50-80 DEG C in low boiling liquid refrigerant vaporizer, directly deliver to thick dimethyl ether rectification working process, 2. power generation system is set, at low boiling liquid refrigerant evaporator outlet, power generation system by-product power is set, more than 0.5MPa absolute pressure, the gas working medium of 80-120 DEG C enters the mechanical driving part of power generation system, the generating of acting drive electrical generators, the gaseous working medium being less than 0.5MPa absolute pressure, 10-50 DEG C after generating, be condensed into liquid state through working fluid condenses device and enter low boiling liquid refrigerant storage tank, send into low boiling liquid refrigerant vaporizer by the pressurization of working medium compression pump and recycle.
Low boiling liquid refrigerant comprises fluorochlorohydrocarbon class, ethers, alkanes etc.; Low boiling liquid refrigerant is fluorochlorohydrocarbon class, ethers, alkanes one wherein, or uses after the mixing of two or more different working medium.
The mechanical work part of power generation system is impeller type or screw type or blade type etc., take screw type as the best.
Low boiling liquid refrigerant vaporizer is vertical, horizontal, take vertical type evaporator as the best, liquid enters from the middle and lower part of vertical type evaporator, and vertical type evaporator has the double effects of preheating and evaporation concurrently, improve the reuse efficiency of low temperature exhaust heat to greatest extent, reduce the temperature of reaction gas outlet.
Low boiling liquid refrigerant vaporizer can select preheating, evaporating integrated structure, also can select preheating, evaporation split-type structural.
The cooling of original thick ether can be utilized in order to reduce investment, storing, pressurization device transforms, by original thick ether cooling, store, pressurization device transform the cooling of low-boiling point liquid working medium as, store, pressurization device.
Good effect of the present invention is: most of according to low temperature exhaust heat of dimethyl ether production system is heat of condensation, waste heat amount is large, system pressure is higher, system media is mainly methyl alcohol, dimethyl ether, water, oxygen content in medium is very low, the features such as the corrosivity of medium to metallic material is less, the working substance steam drive electrical generators adopting the low-temp reaction gas heat exchange of low boiling liquid refrigerant and dimethyl ether production system to make low boiling liquid refrigerant be evaporated to elevated pressures does work and generates electricity, after the heat of reaction gas passes to low temperature liquid working medium, temperature declines, reaction gas is become after the lower gas-liquid mixture of temperature from the gaseous state that temperature is higher directly delivers to thick dimethyl ether rectification working process, fully phase out thick dimethyl ether operation cooling medium to consume and cooling energy consumption, a large amount of low temperature exhaust heat is converted to the electric power of high added value, realize the electric power self-sufficiency of Dimethyl ether production device or be self-sufficient and achieve a surplus, thick dimethyl ether cooling medium consumes and cooling energy consumption reduction by 100% compared with background technique, and the heat recovery efficiency of producing dimethyl ether by dehydrating methanol system improves 5-15%, dimethyl ether by-product power 30-60kwh per ton.
Accompanying drawing explanation
Fig. 1 is background technique schematic flow sheet of the present invention;
Fig. 2 is embodiment of the present invention schematic diagram;
In figure: methyl alcohol heater 1, thick ether heater 2, thick ether water cooler 3, thick ether storage tank 4, thick ether compression pump 5, low boiling liquid refrigerant vaporizer 6, power generation system 7, working fluid condenses device 8, low boiling liquid refrigerant storage tank 9, working medium compression pump 10.
Embodiment
Below in conjunction with accompanying drawing, by embodiment, the invention will be further described.
Embodiment one, background technique, with reference to accompanying drawing 1.
Accompanying drawing 1 produces 400000 tons of producing dimethyl ether by dehydrating methanol device schematic flow sheets per year for background technique, methyl alcohol heater 1 is set, thick ether heater 2, thick ether cooling, storage and pressurization device, cryogenic fluid evaporation, condensation, storage and pressurization device are not set, power generation system is not set; The reaction gas of 0.8-1.0MPa absolute pressure, 170-210 DEG C enters methyl alcohol heater 1 and heat exchange of methanol, it is that the thick ether of 30-40 DEG C is heated to 60-80 DEG C by temperature that the reaction gas that temperature drops to 120-150 DEG C enters thick ether heater 2, thick ether sends into rectification working process, reaction gas temperature drop to 90-110 DEG C enter thick ether water cooler 3 cool to further 30-40 DEG C be all condensed into liquid state after enter thick ether storage tank 4, then by thick ether compression pump 5 pressurize through thick ether heater 2 temperature be elevated to 60-80 DEG C send into thick ether rectification working process; Thick ether water cooler adopts circulating cooling water for cooling, and often producing 1 ton of dimethyl ether circulating cooling water consumption is 30-60m
3, cooling pressurization power electric consume about 5-10kwh; Recirculated cooling water rate of water make-up calculates by 1%, annual recirculating cooling water system moisturizing consumption 12-24 ten thousand m
3, thick ether cooling pressurization power electric consumes about 200-400 ten thousand kwh.
Embodiment two, with reference to accompanying drawing 2.
Embodiment two adopts the present invention, retains methyl alcohol heater 1, cancels thick ether heater 2 and thick ether cooling, stores, pressurization device; Newly-increased low boiling liquid refrigerant vaporizer 6, power generation system 7, working fluid condenses device 8, low boiling liquid refrigerant storage tank 9, working medium compression pump 10; Select R600a(isobutane) as low boiling liquid refrigerant; The reaction gas of 0.8-1.0MPa absolute pressure, 170-210 DEG C enters methyl alcohol heater 1 and heat exchange of methanol, the reaction gas that temperature drops to 120-150 DEG C enters the R600a(isobutane that temperature is 10-35 DEG C by low boiling liquid refrigerant vaporizer 6) evaporation, pressure 1.6-1.8MPa(absolute pressure), the R600a(isobutane of 90-110 DEG C) gas enters power generation system 7, by-product power; Reaction gas temperature is reduced to 60-80 DEG C and is directly sent into thick ether rectification working process for gas-liquid mixture, 30-50 DEG C, 0.3-0.5MPa(absolute pressure of power generation system outlet) R600a(isobutane) gas or gas-liquid mixture, cool to 10-35 DEG C through working fluid condenses device 8 and enter low boiling liquid refrigerant storage tank 9 and be pressurized to 1.7-1.9MPa by working medium compression pump 10 and deliver to low boiling liquid refrigerant vaporizer 6 and recycle; Compared with background technique embodiment 1, the present invention fully phases out thick ether cooling-water consumption and thick ether cooling energy consumption, often produces 1 ton of dimethyl ether circulating cooling water consumption decline 30-60m
3, thick ether cooling pressurization power electric consumption decline 5-10kwh, recovery waste heat generating deducts power generation system from the outer net electric generation 30-60kwh of power consumption; Compared with background technique, annual water-saving amount 12-24 ten thousand m
3, the consumption of thick ether cooling pressurization power electric reduces 200-400 ten thousand kwh, cogeneration by-product power 1200-2400 ten thousand kwh, energy-conservation and environmental benefit highly significant.
Claims (5)
1. the recovery method of a low temperature exhaust heat of dimethyl ether production system, it is characterized in that comprising following steps: 1. arrange low boiling liquid refrigerant vaporizer, at the methyl alcohol heater of dimethyl ether production system reaction gas or the outlet of methanol evaporator, low boiling liquid refrigerant vaporizer is set, 0.7-1.6MPa absolute pressure, the low-temp reaction gas of 90-150 DEG C enters low boiling liquid refrigerant vaporizer, low boiling liquid refrigerant and reaction gas heat exchange are evaporated to more than 0.5MPa absolute pressure, the gas working medium of 80-120 DEG C, reaction gas is cooled to the gas-liquid mixture of 50-80 DEG C in low boiling liquid refrigerant vaporizer, directly deliver to thick dimethyl ether rectification working process, 2. power generation system is set, at low boiling liquid refrigerant evaporator outlet, power generation system by-product power is set, more than 0.5MPa absolute pressure, the gas working medium of 80-120 DEG C enters the mechanical driving part of power generation system, the generating of acting drive electrical generators, the gaseous working medium being less than 0.5MPa absolute pressure, 10-50 DEG C after generating, be condensed into liquid state through working fluid condenses device and enter low boiling liquid refrigerant storage tank, send into low boiling liquid refrigerant vaporizer by the pressurization of working medium compression pump and recycle.
2. the recovery method of a kind of low temperature exhaust heat of dimethyl ether production system according to claim 1, is characterized in that low boiling liquid refrigerant comprises fluorochlorohydrocarbon class, ethers, alkanes.
3. the recovery method of a kind of low temperature exhaust heat of dimethyl ether production system according to claim 2, is characterized in that low boiling liquid refrigerant is fluorochlorohydrocarbon class, ethers, alkanes one wherein, or uses after the mixing of two or more different working medium.
4. the recovery method of a kind of low temperature exhaust heat of dimethyl ether production system according to claim 1 and 2, is characterized in that the mechanical work part of power generation system is impeller type or screw type or blade type.
5. the recovery method of a kind of low temperature exhaust heat of dimethyl ether production system according to claim 1 and 2, it is characterized in that low boiling liquid refrigerant vaporizer is vertical, liquid enters from the middle and lower part of vertical type evaporator.
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