CN206257691U - A kind of flue gas MGGH systems of use condensate heat exchange - Google Patents

A kind of flue gas MGGH systems of use condensate heat exchange Download PDF

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Publication number
CN206257691U
CN206257691U CN201620791661.5U CN201620791661U CN206257691U CN 206257691 U CN206257691 U CN 206257691U CN 201620791661 U CN201620791661 U CN 201620791661U CN 206257691 U CN206257691 U CN 206257691U
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condensate
heat exchanger
heater
smoke
gas
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CN201620791661.5U
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张钧泰
张国柱
李本锋
卢海申
孟庆欣
邱寅晨
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Datang Beijing Energy Management Co Ltd
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Datang Beijing Energy Management Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/30Technologies for a more efficient combustion or heat usage

Abstract

A kind of flue gas MGGH systems of use condensate heat exchange, gas cooler is set on connection flue between boiler air preheater and deduster, smoke re-heater is set on connection flue between desulfurizer and chimney, condensate supplementary heat exchanger is set on the circulating water pipeline between gas cooler and smoke re-heater, in gas cooler, smoke re-heater, the circulating water pipeline and exits and entrances valve regulating system of connection are set between condensate supplementary heat exchanger, condensing water conduit is connected with condensate supplementary heat exchanger and control condenses the valving system of current direction, realize and can automatically control electric precipitation gas approach temperature under various operating modes, automatically control smoke stack emission temperature, have while fume emission environmental requirement is realized and economize on coal, water saving, reduce the technique effect of smoke discharge amount.

Description

A kind of flue gas MGGH systems of use condensate heat exchange
Technical field
The utility model is related to a kind of thermal power plant's minimum discharge MGGH (middle hot media flue gas heat-exchange units:Media Gas- GasHeater) energy-saving environmental protection device and method, belong to thermal power plant's minimum discharge MGGH technical fields.
Background technology
The minimum discharge problem of coal-fired plant boiler smoke evacuation has obtained national attention at present, in developed area for example The place such as the Yangtze River Delta, Zhujiang River triangle emits white cigarette to chimney and quite payes attention to.Because the leakage of the former GGH systems for using causes Minimum discharge is unable to reach, so the application of MGGH is more and more universal.
Flue gas desulfurization (Fluegasdesulfurization, abbreviation FGD).The lime-gypsum stone wet method cigarette of coal-fired flue-gas Desulfurization technology is current application most wide, efficiency highest desulfurization technology.It is considerably long at one from now on for coal-burning power plant In period, FGD will be the main method for controlling SO2 discharges.Flue gas desulfurization mainly has dry type flue gas desulfurizing and wet process of FGD Two kinds.Wherein wet fuel gas desulfurizing technology flow, form and mechanism are similar, mainly use lime stone (CaCO3), lime (CaO) or the slurries such as sodium carbonate (Na2CO3) make detergent, flue gas is washed in reaction tower, so that in removing flue gas SO2.The existing 50 years history of this technique, after continuously improving and improving, Technical comparing is ripe, and with desulfurization effect Rate is (90%~98%) high, and unit capacity is big, and coal adaptability is strong, the advantages of operating cost is relatively low and byproduct is easily reclaimed. Exactly wet desulfurizing process so that flue gas after desulfurization water capacity increases, these with saturation wet flue gas state from desulfurizing tower discharge into Enter chimney and arrange flue gas to air, cause grand chimney and emit white cigarette phenomenon.
Since saturation wet flue gas state can emit white cigarette from chimney discharge, then heating neat stress disengages it from saturation state again Discharge emits white cigarette phenomenon with regard to that can mitigate, thus using the neat stress after the flue gas heat heating desulfurizing tower before desulfurizing tower, MGGH skills The extensive use of art is arisen at the historic moment.After solving the key technical problem of flue gas low-temperature corrosion, the economy of MGGH systems seems Important, how on the premise of neat stress emission request is reached, it is vast electric power skill benefit of saving coal to be improved as far as possible and is become The target that art worker pursues
Existing MGGH (tubular type flue gas heat-exchange unit, water-borne formula flue gas heat-exchange unit, tubular type GGH) system, aids in steaming using winter The mode of vapour heating adjusts flue-gas temperature, and when summer condition runs, substantial amounts of smoke discharging residual heat enters whole system with heat medium water Desulfurization fume exhaust, the meaningless waste of assembly.Meanwhile, summer lacks the means of gas cooler outlet cigarette temperature before regulation deduster, presses Heat exchange area bigger than normal need to be designed with summer condition gas cooler according to existing design, the waste of metal material is caused, in the winter time Under operating mode and it is not suitable with.Simultaneously, it is necessary to control the inlet flue gas temperature of deduster, for electric dust collector, flue-gas temperature is reduced, subtracted Lack flue gas volume flow, reduced the ratio resistance of dust, improve efficiency of dust collection, reduce dedusting power consumption.Removed for cloth bag Dirt device, controls flue-gas temperature, prevents overtemperature flue gas from entering, it is ensured that the security of device and to reduce dedusting power consumption.Mesh It is poor that preceding MGGH systems adapt to seasonal variations ability to work.
Utility model content
The purpose of this utility model is to solve the problems, such as that existing MGGH adapts to seasonal variations ability.The utility model Realize that winter heats using condensate, the mode of summer heat absorption together with gas cooler, flue gas heater, solves existing electricity The low problem of factory's desulfurization fume exhaust temperature.
In order to solve the above-mentioned technical problem, the technical solution of the utility model there is provided a kind of use condensate heat exchange Flue gas MGGH systems, gas cooler is set on the connection flue between boiler air preheater and deduster, desulfurizer with Smoke re-heater is set on connection flue between chimney, deduster is set between gas cooler and smoke re-heater, is drawn Blower fan and desulfurizer, it is characterised in that set on the circulating water pipeline between gas cooler and smoke re-heater and condensed Water supplementary heat exchanger;Set between gas cooler, smoke re-heater, condensate supplementary heat exchanger connection circulating water pipeline and Exits and entrances valve regulating system, is connected with condensing water conduit on condensate supplementary heat exchanger and control condenses current direction Valving system.
Further, also set up on the circulating water pipeline between gas cooler and smoke re-heater and changed with condensate auxiliary Hot device bypass duct in parallel, coming into operation or bypassing for condensate supplementary heat exchanger is switched using control valve.
Further, water circulating pump is set on the cold section of circulating water pipeline between gas cooler and smoke re-heater; Using variable frequency pump.
Further, in the entrance point introduction pipe of one-level low-pressure heater, it is connected respectively to the condensation of supplementary heat exchanger Inlet pipeline and condensation outlet conduit;In the port of export introduction pipe of one-level low-pressure heater, same is connected respectively to auxiliary The condensation inlet pipeline and condensation outlet conduit of heat exchanger.
Further, control the condensation current direction from low-pressure heater to switch using control valve, realize that low temperature coagulates Inflow condensed water in high temperature outflow after heat absorption is born water, or condensed water in high temperature flows into the low-temperature condensate outflow after heat release.
The utility model contrast prior art has following beneficial effect:The utility model uses condensate there is provided one kind The flue gas MGGH systems of heat exchange, realize that condensing current direction changes to realize heat release or heat absorption switch operating, it is ensured that in various operating modes The influence of variation of ambient temperature and unit load change to exhaust gas temperature can be offset, no matter how environment temperature changes, No matter how unit load changes, to realize and can automatically control electric precipitation gas approach temperature under various operating modes, automatically control Smoke stack emission temperature, the technology effect with smoke discharge amount of economizing on coal, economize on water, reduce while fume emission environmental requirement is realized Really.
Brief description of the drawings
Fig. 1 is the structural representation of system
Wherein:Deduster 2, air-introduced machine 3, desulfurizer 4, chimney 9, gas cooler 1, smoke re-heater 5, water circulating pump 6th, supplementary heat exchanger 7, low-pressure heater 8
Specific embodiment
To become apparent the utility model, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
With reference to the accompanying drawings shown in 1, the present embodiment provides a kind of flue gas MGGH systems, between boiler air preheater and deduster Gas cooler 1 is set on connection flue, smoke re-heater 5 is set on the connection flue between desulfurizer 4 and chimney, On hot arc circulating water pipeline between gas cooler 1 and smoke re-heater 5 set supplementary heat exchanger 7, gas cooler 1 with Deduster 2, air-introduced machine 3 and desulfurizer 4 are set between smoke re-heater 5, between gas cooler 1 and smoke re-heater 5 Cold section of circulating water pipeline on frequency conversion water circulating pump 6 is set, by diagram meaning in gas cooler 1, smoke re-heater 5, auxiliary The circulating water pipeline and exits and entrances valve regulating system of connection are set between heat exchanger 7, are connected with supplementary heat exchanger 7 solidifying Bear water pipeline and valving system.
Also set up on hot arc circulating water pipeline between gas cooler 1 and smoke re-heater 5 in parallel with supplementary heat exchanger Bypass duct, coming into operation or bypassing for supplementary heat exchanger is switched using control valve.
In the entrance point introduction pipe of one-level low-pressure heater 8, the condensation inlet pipeline of supplementary heat exchanger is connected respectively to With condensation outlet conduit;In the port of export introduction pipe of one-level low-pressure heater, the same supplementary heat exchanger that is connected respectively to Condense inlet pipeline and condense outlet conduit.The condensation current direction from low-pressure heater is controlled to switch using control valve, Realize that low-temperature condensate flows into the condensed water in high temperature outflow after heat absorption, or condensed water in high temperature flows into the low-temperature condensate after heat release Outflow.
Accessed from low-pressure heater by increasing supplementary heat exchanger in existing gas cooler, flue gas heater system Condensate line, can be by supplementary heat exchanger in the winter time using condensed water in high temperature heating gas cooler, in flue gas heater Heating agent recirculated water, summer, using the heating agent recirculated water in low-temperature condensate heat absorption gas cooler, flue gas heater, forms season Adaptability heat exchanger.
A kind of flue gas MGGH operation methods, comprise the following steps:
The import cigarette temperature of deduster 2 is set as 90 DEG C (or between 85 DEG C -95 DEG C a certain require data), low temperature is realized Electric precipitation;
Chimney emission temperature is set as 80 DEG C (or a certain required values), elimination emits white cigarette phenomenon;
During winter operation, control the condensation current direction from low-pressure heater to switch using control valve, realize high temperature Condensate flows into the supplementary heat exchanger of the low-temperature condensate outflow after heat release;According to gas cooler exit gas temperature, (electricity is removed Dirt inlet flue gas temperature) regulation heat medium water system circulation water, quantity of circulating water can be adjusted by frequency conversion water circulating pump 6, according to cigarette Gas reheater inlet water temperature (smoke re-heater imports and exports cigarette temperature as the feedforward) condensing water flow of regulation from low-pressure heater, Low-pressure heater branch road condensate is adjusted using variable frequency pump and regulating valve mode
During summer operation, control the condensation current direction from low-pressure heater to switch using control valve, realize low temperature Condensate flows into the supplementary heat exchanger of the condensed water in high temperature outflow after heat absorption;According to smoke re-heater exit gas temperature (chimney Inlet flue gas temperature) regulation heat medium water system circulation water, quantity of circulating water can be adjusted by frequency conversion water circulating pump 6, according to flue gas Cooler inlet water temperature (gas cooler exports cigarette temperature as the feedforward) condensing water flow of regulation from low-pressure heater, low pressure Heater branch road condensate is adjusted using variable frequency pump and regulating valve mode.
Spring and autumn or be not required to come into operation seasonal adaptation heat exchanger when, open supplementary heat exchanger bypass valve in parallel, do not come into operation The steam supplementary heat exchanger.
During specific implementation, by detecting gas cooler 1, the smoke entrance temperature of smoke re-heater 5, heat medium water, solidifying Bear water the parameters such as out temperature, and by signal inputs such as flue-gas temperature flow, heating agent water-carrying capacity temperature, condensing water flow temperature To in control system, control system controls the operating of whole system.
Smoke entrance flow, temperature and heating agent water entrance flow, temperature according to gas cooler and smoke re-heater Degree, condensing water flow temperature, automatically adjust the heat recovery steam flow or the condensing water flow from low-pressure heater of access, so that It is adapted with the heat needed for smoke re-heater, while the heat medium water inlet temperature of smoke re-heater 5 is controlled at 95 DEG C or so, really The flue-gas temperature for entering chimney 10 is protected at 80 DEG C or so.
Condensing water flow from low-pressure heater passes through water inlet pipe water pump and valve regulated.
When break down work or be not required to come into operation supplementary heat exchanger when, can by pipe valve open association bypass, utilize Parallel connection bypass maintenance system is normally run.
Although the utility model is disclosed as above with preferred embodiment, its be not for limiting the utility model, it is any Those skilled in the art are not being departed from spirit and scope of the present utility model, can make possible variation and modification, because The scope that this protection domain of the present utility model should be defined by the utility model claim is defined.

Claims (4)

1. a kind of flue gas MGGH systems of use condensate heat exchange, set on the connection flue between boiler air preheater and deduster Gas cooler is put, smoke re-heater is set on the connection flue between desulfurizer and chimney, in gas cooler and cigarette Deduster, air-introduced machine and desulfurizer are set between gas reheater, it is characterised in that gas cooler and smoke re-heater it Between circulating water pipeline on set condensate supplementary heat exchanger;In gas cooler, smoke re-heater, condensate supplementary heat exchanger Between the circulating water pipeline and exits and entrances valve regulating system of connection are set, condensation is connected with condensate supplementary heat exchanger Waterpipe and control condense the valving system of current direction;Two-way pipeline is drawn in the entrance point of one-level low-pressure heater, point The condensation inlet pipeline of supplementary heat exchanger is not connected to and condenses outlet conduit;Two are drawn in the port of export of one-level low-pressure heater Road pipeline, same the condensation inlet pipeline for being connected respectively to supplementary heat exchanger and condensation outlet conduit.
2. according to claim 1 using the flue gas MGGH systems of condensate heat exchange, it is characterised in that gas cooler and cigarette The bypass duct in parallel with condensate supplementary heat exchanger is also set up on circulating water pipeline between gas reheater, using control valve To switch coming into operation or bypassing for condensate supplementary heat exchanger.
3. according to claim 1 using condensate heat exchange flue gas MGGH systems, it is characterised in that gas cooler with Water circulating pump is set on cold section of circulating water pipeline between smoke re-heater;Using variable frequency pump.
4. according to claim 1 using condensate heat exchange flue gas MGGH systems, it is characterised in that using control valve come The condensation current direction switching from low-pressure heater is controlled, realizes that low-temperature condensate flows into the condensed water in high temperature outflow after heat absorption, Or condensed water in high temperature flows into the low-temperature condensate outflow after heat release.
CN201620791661.5U 2016-07-06 2016-07-06 A kind of flue gas MGGH systems of use condensate heat exchange Active CN206257691U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106123002A (en) * 2016-07-06 2016-11-16 大唐(北京)能源管理有限公司 A kind of flue gas MGGH system and method using condensation water heat exchange
CN108911280A (en) * 2018-09-20 2018-11-30 西安热工研究院有限公司 A kind of flue gas condensing water Integrated Processing Unit and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106123002A (en) * 2016-07-06 2016-11-16 大唐(北京)能源管理有限公司 A kind of flue gas MGGH system and method using condensation water heat exchange
CN108911280A (en) * 2018-09-20 2018-11-30 西安热工研究院有限公司 A kind of flue gas condensing water Integrated Processing Unit and method

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