CN105525957A

CN105525957A - Thermodynamic system for replacing molten salt by steam and combined heat and power generation method

Info

Publication number: CN105525957A
Application number: CN201510860152.3A
Authority: CN
Inventors: 吕桐华
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-11-20
Filing date: 2015-11-20
Publication date: 2016-04-27
Anticipated expiration: 2035-11-20
Also published as: CN105525957B

Abstract

The invention discloses a method of a thermodynamic system for replacing molten salt by steam. The steam can replace the molten salt to serve as a heat exchange medium of melamine to realize four times of acting of the steam from high to low and the combined heat and power generation; the technical effect of multiplying economic benefit is generated by using the same production cost with the prior art; in the reaction process of each ton of melamine, 6937 KW.h of electricity can be newly added; 21 ton of acting steam is sold; and the molten salt thermodynamic system can omit yield of the melamine.

Description

The method of fused salt thermodynamic system and cogeneration of heat and power is substituted with steam

Technical field:

The present invention relates to the heating power production capacity of prior art, thermoelectricity production capacity, particularly remove alternative another kind of known heat transferring medium with the known heat transferring medium of one, and in alternative Process, realize Organization of various factors of production between production capacity, omission and cogeneration of heat and power.

Background technique:

The existing melamine production capacity in home and abroad, what its reactor adopted is fused salt heat supply process, that is: make heat transferring medium with fused salt and provide heat energy to reactor, the eutectic that fused salt is made up of potassium nitrate (KNO3) 53%, sodium nitrate (NaNO3) 7%, natrium nitrosum (NaNO2) 40%, the initial stage fusing point of fused salt is 142.5 DEG C, and daily acting fusing point is 165---185 DEG C.As a rule, fused salt does work in temperature >=420 DEG C of melamine reactor, flows back to waste heat temperature of molten salt >=400 DEG C of storage tank after acting, and this waste heat fused salt can not secondary or step acting because of the high easily blocking pipe of fusing point

Existing fused salt thermodynamic system comprises: fused salt storage tank, fused salt, pump for liquid salts, conveyance conduit, fused salt oven and running subsidiary engine, vapor plume reduce discharging facility, chimney, melamine reactor built-in and preposition heat exchanger (hereinafter referred to as reacting replacing heat device), power, the facility such as water supply, its flow process of doing work can simply be expressed as: fused salt storage tank (constant base temperature >=400 DEG C) → pump for liquid salts → fused salt oven (be heated to >=420 DEG C) → reacting replacing heat device → be back to fused salt storage tank (constant base temperature >=400 DEG C).

From above-mentioned: the circular work flow process of fused salt, it is the thermodynamic system of independent operating in melamine production capacity, the only technical purpose of this thermodynamic system and technique effect: be fused salt is heated to technique temperature required after provide heat energy for the course of reaction of melamine, therefore, existing fused salt thermodynamic system is the mode of work-doing of traditional one-way type heat supply of typical " heat one is used ".This single mode of work-doing will certainly cause that energy consumption is high and comprehensive cost of production is high.Calculate by price in 2015 (lower with): the overall cost of the ton melamine course of reaction of existing fused salt thermodynamic system is 1590 yuan, and (fuel accounts for 45%, pump for liquid salts and relevant subsidiary engine power consumption account for 30%, the expenses such as other runs, maintenance, reduction of discharging pollution treatment, depreciation of equipment, personnel's wage account for 25%), these 1590 yuan are equivalent to calorific value of equal value 2730 kilograms mark coal

Summary of the invention:

1. the object of invention: change the high cost with low efficiency present situation that heat transferring medium does work single, realize heat transferring medium step circular work, relevant production capacity is combined into the energy conserving system of cogeneration of heat and power, to reach the object improving source benefit and omit production factors.

2. invent technical problem to be solved: find the heat transferring medium that a type can substitute fused salt, the thermal performance of this heat transferring medium must be better than fused salt, must production capacity involved by through the present invention different temperatures with can unit and not blocking pipe, only so, prior art heat transferring medium can be overcome to do work single defect, the step circular work of invention technology heat transferring medium can be realized, and taking this as an opportunity that the energy resource structure of relevant production capacity is carried out organically optimum organization, the each technical characteristics after combination is made to produce the function supported each other, the function mutually supported is provided with between production capacity, the technique effect omitting production factors and multiplication productivity effect can be produced.All these contents are all the technical barriers that the present invention must solve,

3. the technological scheme of invention: according to the contrast to existing various heat transferring medium thermal performance, analyze rear confirmation, the thermal performance of steam is better than fused salt, steam can 105---by the acting of self kinetic energy in the scope of 605 DEG C, again, there is not the problem of blocking pipe in steam, fused salt can be substituted in specific parameter area completely and provide heat energy to melamine reacting replacing heat device, and many steps circular work in addition can be realized.Therefore, substitute fused salt with steam and do heat transferring medium, can combine and through thermoelectricity production capacity, melamine production capacity and other relevant production capacity using steam heating.For ease of contrast and the technique effect of explaining invention technology, it is input energy sources benchmark that invention technology adopts with the equal cost of the ton melamine of existing fused salt thermodynamic system.That is: with the calorific value of equal value 2730 kilograms of the ton melamine overall cost 1590 yuan of existing fused salt thermodynamic system mark coal, the heat energy input reference of the ton melamine course of reaction of invention technology is made.These 2730 kilograms mark coal calorific values are combined into High Temperature High Pressure or the supercritical steam boiler of thermoelectricity production capacity, then can distinguish output High Temperature High Pressure (temperature 545 DEG C, pressure 14.5MPA) or overcritical (temperature 605 DEG C, pressure 25MPA) steam >=21 ton, the heat transferring medium of invention technology is made with this steam, this steam then can through the present invention combine each production capacity with can unit step circular work can be realized, both can be used for the generating of thermoelectricity production capacity, also can be used for the reacting replacing heat device of melamine production capacity, and waste heat overbottom pressure later use is in other relevant production capacity, the acting step of steam, parameter and flow process as follows:

One step acting steam: steam flow >=21 ton, temperature 545 DEG C, pressure 14.5MPA or temperature 605 DEG C, pressure 25MPA, this steam comes from High Temperature High Pressure or the supercritical steam boiler of thermoelectricity production capacity, first this steam do work in " preposition sucking condensing type steam turbine generator ", in acting generating 4037 kilowatts. Shi Hou, with temperature 399---391 DEG C, the parameter of pressure 2.6MPA, continue lower step do work by extracting 21 tons of steam in " preposition sucking condensing type steam turbine generator " out.

Two step acting steam: steam flow 21 tons, temperature 399---391 DEG C, pressure 2.6MPA, come from the waste heat overbottom pressure of " a step acting steam ", this steam enters and does work in " the reacting replacing heat device " of melamine production capacity, and state modulator with temperature automatically controlled pressure controlled valve is by the steam going out " reacting replacing heat device " after acting: temperature 390---386 DEG C, pressure 2.1MPA.Draw as calculated: the steam cost that the heat supply of ton melamine course of reaction consumes is 297 yuan, that is: with the repertoire of the steam cost of the 297 yuan just overall cost 1590 yuan of alternative fused salt thermodynamic system, and cogeneration of heat and power can be realized with the electric power that gets both.

Three steps acting steam: steam flow 21 tons, temperature >=386 DEG C, pressure 2.1MPA, come from the waste heat overbottom pressure of " two steps acting steam ", do work in " rearmounted sucking condensing type steam turbine generator ", can generate electricity 2900 kilowatts. time.

Four steps acting steam: steam flow 21 tons, temperature 190---105 DEG C, pressure 0.7MPA, comes from the waste heat overbottom pressure of " three steps acting steam ", export trade can do work in associated steam user or do insulation heating.Steam after acting or hot water closed circulating are recycled to the water supply system of steam boiler, form the heat energy acting flow process of full closed-circuit.

The technological scheme of invention and steam acting flow process can show for: 1. mark the export trade of the reacting replacing heat device → 6. rearmounted sucking condensing type steam turbine generator of the melamine production capacity of output steam >=21 of the High Temperature High Pressure of 2730 kilograms, coal → 2. enter thermoelectricity production capacity or supercritical steam boiler → 3. ton → 4. preposition sucking condensing type steam turbine generator → 5. → 7. and return steam boiler water supply system for steam afterwards or hot water, the steam working system of formation closed circulating for associated steam user → 8. outer outward.

The beneficial effect of the invention:

The fused salt thermodynamic system of thermoelectricity production capacity of the prior art, melamine production capacity carries out combining and one that forms new technological scheme by the present invention, production capacity refers to the prior art throughput used, and comprises whole technician of participation production, manufacturing mechanism and method of controlling operation thereof etc.Therefore, except steam acting flow process of the present invention and parameter, other is all the known content of related domain.Therefore those skilled in the art, according to above-mentioned disclosed steam acting flow process, parameter, and in conjunction with the known technology of related domain, intactly can understand, use and realize the present invention.

Novelty of the present invention is steam acting flow process and parameter, and this flow process has more rationality, and this parameter is closer to optimised process state.Creationary essence of the present invention is just combination itself, and the mutual support function of the rear each technical characteristics of combination.Beneficial effect of the present invention is as follows:

1. the cost of production of the ton melamine of prior art and invention technology is all calorific value of equal value 2730 kilograms and marks coal, this cost only technique effect in the prior art, is for the course of reaction of melamine per ton provides heat energy; This cost in invention technology except keeping same function, support that again thermoelectricity production capacity increases generating 6937 kilowatts newly. time (preposition generating 4037 kilowatts. time, rearmounted generating 2900 kilowatts. time) and export trade acting steam 21 tons, that is: the anti-life process of answering of melamine per ton increases generating 6937 kilowatts newly. time and steam 21 tons, be equivalent to one-way type produce similar production capacity energy-conservation 3500 kilograms mark coals.

2. provide heat energy with the reacting replacing heat device that the waste heat overbottom pressure steam of thermoelectricity production capacity is melamine, this technical characteristics supports that melamine production capacity eliminates fused salt thermodynamic system, but still maintains the production function of melamine production capacity.

3. with waste heat overbottom pressure steam outward for associated steam user, this technical characteristics can support that associated steam user eliminates steam boiler and energy consumption, steam user also supports that thermoelectricity production capacity has digested waste heat overbottom pressure, and existing mutual economic benefit, also has the social benefit of energy-saving and emission-reduction.

Claims

1. one kind substitutes the method for fused salt thermodynamic system with steam, its essential features comprises: by temperature 545 DEG C, pressure 14.5MPA or temperature 605 DEG C, the steam of pressure 25MPA does a step merit in preposition sucking condensing type steam turbine generator, temperature 399 is extracted out by preposition sucking condensing type steam turbine generator---391 DEG C, the steam of pressure 2.6MPA does two step merits in the reacting replacing heat device of melamine production capacity, temperature >=386 DEG C thus after acting, the steam of pressure 2.1MPA, continue to do three step merits in rearmounted sucking condensing type steam turbine generator, after acting 190 thus---105 DEG C, the steam of 0.7MPA, four step merits are done in associated steam user after export trade, do steam after four step merits or hot water closed circulating is recycled to steam boiler water supply system, form the steam working system of full closed-circuit.