CN105525957B

CN105525957B - Fused salt therrmodynamic system and the method for cogeneration of heat and power are substituted with steam

Info

Publication number: CN105525957B
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: 2018-08-14
Anticipated expiration: 2035-11-20
Also published as: CN105525957A

Abstract

The present invention is a kind of method substituting fused salt therrmodynamic system with steam, after making the heat transferring medium of melamine with steam replacement fused salt, four actings and cogeneration of heat and power of steam from high to low may be implemented, with the same production cost of the prior art, generate the technique effect of multiplication economic benefit, the reaction process of melamine per ton, when can increase 6937 kilowatts of of power generation newly, export trade 21 tons of steam of acting, and the fused salt therrmodynamic system of melamine production capacity can be omitted.

Description

Fused salt therrmodynamic system and the method for cogeneration of heat and power are substituted with steam

Technical field：

The present invention relates to the heating power production capacity of the prior art, thermoelectricity production capacities, more particularly to are gone with a kind of well known heat transferring medium Heat transferring medium well known to another kind is substituted, and realizes Organization of various factors of production, omission and thermoelectricity between production capacity in alternative Process Coproduction.

Background technology：

The existing melamine production capacity in home and abroad is fused salt heat supply process used by reactor, i.e.,：It is changed with fused salt Thermal medium provides thermal energy to reactor, and fused salt is by potassium nitrate (KNO3) 53%, sodium nitrate (NaNO3) 7%, sodium nitrite (NaNO2) the initial stage fusing point of the eutectic of 40% composition, fused salt is 142.5 DEG C, and daily acting fusing point is 165 --- 185 DEG C.It is logical For often, fused salt acting in temperature >=420 DEG C of melamine reactor, flowed back to after acting the waste heat temperature of molten salt of storage tank >= 400 DEG C, which cannot the acting ... of secondary or step because of the high easily blocking pipeline of fusing point

Existing fused salt therrmodynamic system includes：Fused salt storage tank, fused salt, pump for liquid salts, conveyance conduit, fused salt heating furnace and operating are auxiliary Machine, flue gas emission reduction facility, chimney, melamine reactor built-in and preposition heat exchanger (hereinafter referred to as：Reacting replacing heat device), The facilities such as power supply, water supply, acting flow can be represented simply as：Fused salt storage tank (constant base temperature >=400 DEG C) → pump for liquid salts → molten Salt heating furnace, which (is heated to >=420 DEG C), → reacting replacing heat device → is back to fused salt storage tank (constant base temperature >=400 DEG C).

From the foregoing, it can be seen that：The circular work flow of fused salt is independently operated therrmodynamic system in melamine production capacity, the heat The only technical purpose and technique effect of Force system：It is the reaction being heated to fused salt after technique required temperature for melamine Journey provides thermal energy, and therefore, existing fused salt therrmodynamic system is the acting side of traditional one-way type heat supply of typical " heat one is used " Formula.This single mode of work-doing will certainly cause high energy consumption and comprehensive production cost high.By the calculating of price (similarly hereinafter) in 2015： The overall cost of the ton melamine reaction process of existing fused salt therrmodynamic system be 1590 yuan (fuel accounts for about 45%, pump for liquid salts and Related subsidiary engine power consumption accounts for about 30%, 25%) expenses such as other operations, repair, emission reduction pollution treatment, equipment depreciation, personnel's wage account for about, This 1590 yuan are equivalent to 2730 kilograms of mark coals of calorific value of equal value

Invention content：

1. the purpose of invention：Change the high cost with low efficiency present situation that heat transferring medium does work single, realizes heat transferring medium step cycle Related production capacity, is combined into the energy conserving system of cogeneration of heat and power by acting, to reach the mesh for improving source benefit and omitting production factors 's.

2. the technical problems to be solved by the invention：The heat transferring medium of fused salt can be substituted by finding a type, the heat transferring medium Thermal performance must be better than fused salt, it has to be possible to which the different temperatures of production capacity involved by the perforation present invention is managed with energy unit without blocking Road can overcome prior art heat transferring medium to do work single defect only so, can realize that inventive technique heat exchange is situated between The step circular work of matter, and taking this as an opportunity that the energy resource structure of related production capacity is carried out organically optimum organization, after making combination Each technical characteristic generate the function supported each other, be provided with the function of mutually supporting between production capacity, you can generate and omit life Produce the technique effect of element and the productivity effect that doubles.All these contents are all the technical barriers that the present invention must solve,

3. the technical solution of invention：According to existing various heat transferring medium thermal performance comparison, confirm after analysis, steam Thermal performance be better than fused salt, steam can be 105 --- do work by itself kinetic energy in the range of 605 DEG C, in addition, there is no stifled for steam The problem of filling in pipeline can substitute fused salt in specific parameter area and provide thermal energy to melamine reacting replacing heat device completely, And it can realize more step circular works in addition to this.Therefore, it substitutes fused salt with steam and does heat transferring medium, merging perforation can be organized The production capacity of thermoelectricity production capacity, melamine production capacity and other steam heatings used in connection with.For ease of comparing and illustrating inventive technique Technique effect, inventive technique use the same cost with the ton melamine of existing fused salt therrmodynamic system for input energy sources benchmark. I.e.：With 2730 kilograms of mark coals of calorific value of equal value of 1590 yuan of the ton melamine overall cost of existing fused salt therrmodynamic system, invent The thermal energy input reference of the ton melamine reaction process of technology.This 2730 kilograms mark coal calorific values are combined into the height into thermoelectricity production capacity Warm high pressure or supercritical steam boiler can then distinguish output high temperature and pressure (545 DEG C of temperature, pressure 14.5MPA) or overcritical (temperature Spend 605 DEG C, pressure 25MPA) steam >=21 ton, make the heat transferring medium of inventive technique with the steam, which can then penetrate through this hair Bright combined each production capacity with energy unit and can realize step circular work, can be not only used for the power generation of thermoelectricity production capacity, it can also be used to The reacting replacing heat device and waste heat overbottom pressure later use of melamine production capacity are in other related production capacities, acting step, the ginseng of steam Number and flow are as follows：

One step acting steam：Quantity of steam >=21 ton, 545 DEG C of temperature, pressure 14.5MPA or 605 DEG C of temperature, pressure 25MPA, the steam come from the high temperature and pressure or supercritical steam boiler of thermoelectricity production capacity, which does work first in " preposition pumping Solidifying formula steam turbine generator ", when acting generates electricity 4037 kilowatts of after, with temperature 399 --- 391 DEG C, the parameter of pressure 2.6MPA, Continue lower step acting by 21 tons of steam of extraction in " preposition extraction condensing type steam turbine generator ".

Two steps acting steam：21 tons of quantity of steam, temperature 399 --- 391 DEG C, pressure 2.6MPA come from that " step is done The waste heat overbottom pressure of work(steam ", the steam enter and do work to go out " instead after " the reacting replacing heat device " of melamine production capacity, acting Answer heat exchanger " steam be by state modulator with temperature automatically controlled pressure valve：Temperature 390 --- 386 DEG C, pressure 2.1MPA.Through meter It obtains：Steam cost consumed in the heat supply of ton melamine reaction process is 297 yuan, i.e.,：Just with 297 yuan of steam costs The repertoire of 1590 yuan of the overall cost of alternative fused salt therrmodynamic system, and cogeneration of heat and power can be realized with the electric power that gets both.

Three steps acting steam：21 tons of quantity of steam, temperature >=386 DEG C, pressure 2.1MPA come from " two steps acting steaming The waste heat overbottom pressure of vapour ", acting in " postposition extraction condensing type steam turbine generator ", can generate electricity 2900 kilowatts of when.

Four steps acting steam：21 tons of quantity of steam, temperature 190 --- 105 DEG C, pressure 0.7MPA, come from that " three steps are done The waste heat overbottom pressure of work(steam ", can export trade acting in associated steam user or make heat preservation heating be used.Steam after acting or heat Water totally enclosed circulation and stress constitutes the thermal energy acting flow of full closed cycle to the water supply system of steam boiler.

Invention technical solution and steam acting flow can show for：1. 2730 kilograms of coal of mark → 2. enter thermoelectricity production capacity The melamine of the preposition extraction condensing type steam turbine generator in output steam >=21 ton of high temperature and pressure or supercritical steam boiler → 3. → 4. → 5. The reacting replacing heat device of amine production capacity → 6. postposition extraction condensing type steam turbine generator → 7. export trade is outside for associated steam user → 8. confession outside Steam or hot water later returns to steam boiler water supply system, forms the steam working system of closed circulating.

Advantageous effect of the invention：

The present invention is to be combined thermoelectricity production capacity in the prior art, the fused salt therrmodynamic system of melamine production capacity and structure At a new technical solution, production capacity refers to the prior art production capacity used, include participate in production whole skills Art personnel, production equipment and method of controlling operation thereof etc..Therefore, other to be all in addition to the steam of present invention acting flow and parameter The known content of this field.Therefore those skilled in the art, according to steam acting flow disclosed above, parameter, and combine this The known technology in field, you can be fully understood by, use and realize the present invention.

Novelty of the invention is that steam acting flow and parameter, the flow have more reasonability, the parameter is closer to most Good state of the art.The creative essence of the present invention is that the mutual support of each technical characteristic after combination itself, and combination Function.Beneficial effects of the present invention are as follows：

1. the production cost of the ton melamine of the prior art and inventive technique is all 2730 kilograms of mark coals of calorific value of equal value, should The only technique effect of cost in the prior art is to provide thermal energy for the reaction process of melamine per ton；The cost is being sent out In bright technology in addition to the function of maintaining like, and (preposition power generation 4,037,000 when support thermoelectricity production capacity 6937 kilowatts of of newly-increased power generation When watt, postposition generate electricity 2900 kilowatts of when) and export trade do work 21 tons of steam, i.e.,：The anti-life of melamine per ton answers process new When issuing additional 6937 kilowatts of of electricity and 21 tons of steam, energy saving 3500 kilograms of similar production capacity for being equivalent to one-way type production mark coal.

2. providing thermal energy with the waste heat overbottom pressure steam of thermoelectricity production capacity for the reacting replacing heat device of melamine, the technical characteristic branch It holds melamine production capacity and fused salt therrmodynamic system is omitted, but still maintain the production function of melamine production capacity.

3. associated steam user can be supported to be omitted for associated steam user, the technical characteristic outside waste heat overbottom pressure steam Steam boiler and energy consumption, steam user also support that thermoelectricity production capacity has digested waste heat overbottom pressure, existing mutual economic benefit, There is the social benefit of energy-saving and emission-reduction.

Claims

1. an acting step in a kind of flow of being done work with steam substitutes fused salt therrmodynamic system production melamine and thermoelectricity joins The method of production, essential features are：2730 kilograms of mark coal calorific values are combined into the high temperature and pressure of existing thermoelectricity production capacity or super Transcritical vapor boiler, then can output temperature 545 DEG C of pressure 14.5MPA or 605 DEG C of pressure 25MPA of temperature steam >=21 ton, use The steam does a step work(when preposition extraction condensing type steam turbine generator can generate electricity 4037 kilowatts of, the temperature after thus doing work 399 --- 21 tons of the waste heat overbottom pressure steam of 391 DEG C of pressure 2.6MPA does two step work(in the reacting replacing heat device of melamine production capacity I.e. alternative fused salt therrmodynamic system, 21 tons of temperature >=386 DEG C pressure 2.1MPA waste heat overbottom pressure steam after thus doing work continue Three step work(are done when postposition extraction condensing type steam turbine generator can generate electricity 2900 kilowatts of, the temperature 190 after thus doing work --- Four step work(are done after 21 tons of export trades of waste heat overbottom pressure steam of 105 DEG C of pressure 0.7MPA in associated steam user, do four step work(it Steam or hot water afterwards is recyclable to steam boiler water supply system, constitutes the steam working system of full closed cycle.