CN214115605U - Steam conditioning system for converter waste heat recovery - Google Patents

Abstract

The utility model discloses a steam quenching and tempering system for converter waste heat recovery, include the moisturizing subsystem that provides the circulating water for steam quenching and tempering system, for steam quenching and tempering system supplement the steam the mend vapour subsystem, carry out the air distribution subsystem of air distribution for the mend vapour subsystem and carry out on-line control's PLC controller to steam quenching and tempering system. The utility model can fully recover the heat energy of the converter through the water replenishing subsystem and control the flow rate of the circulating water; the steam supplementing subsystem can generate superheated steam to make up the deficiency of steam provided by the low-pressure steam distributing cylinder to the generator set; the air distribution subsystem reasonably distributes air to the boiler and the burner, so that the temperature and the pressure in the boiler are effectively controlled, the reasonable air distribution point is effectively controlled to fully combust the fuel, and the fuel resource is saved; through the cooperation among all subsystems, the steam can be continuously, stably and sufficiently supplied to the steam turbine generator unit, and the normal, stable and efficient operation of the steam turbine generator unit is realized; through setting up the PLC controller, degree of automation is high, the security is high.

Description

Steam conditioning system for converter waste heat recovery

Technical Field

The utility model relates to a steam quenching and tempering technical field, concretely relates to steam quenching and tempering system for converter waste heat recovery.

Background

A converter is a metallurgical furnace for converting steel, and its body can rotate, and is therefore called a converter. The converter generates a large amount of heat in the smelting process, and besides a part of the heat is used for smelting, a great part of other heat (waste heat) is dissipated, so that the converter does not accord with the environmental protection concept of energy conservation and emission reduction.

At present, in order to reduce the waste of converter waste heat resources, a power generation technology for recycling converter waste heat is applied. However, under the existing production conditions, due to the discontinuity of converter operation and a specific smelting period, the steam pressure and the output fluctuation are very large, so that the main steam and the steam supplement flow, the pressure, the temperature and the like of a steam turbine cannot reach the rated parameters of the unit, the long-term low-load operation of the steam turbine generator unit is caused, and the economical efficiency and the equipment utilization rate of the generator unit are seriously influenced. Therefore how to use a small amount of blast furnace gas burning to produce the flue gas, promote the steam production parameter, ensure steam turbine admission parameter, realize that turbo generator set is normal, stable, high-efficient operation, be the problem that this technical staff of present stage needs to solve urgently.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a steam quenching and tempering system for converter waste heat recovery is provided, can use a small amount of blast furnace gas burning to produce the flue gas, promote and produce vapour parameter, guarantee steam turbine admission parameter realizes that turbo generator set is normal, stable, high-efficient operation.

In order to solve the technical problem, the utility model adopts the following technical proposal.

The steam conditioning system for recovering the waste heat of the converter comprises a water supplementing subsystem for providing circulating water for the steam conditioning system, a steam supplementing subsystem for supplementing steam for the steam conditioning system, an air distribution subsystem for distributing air for the steam supplementing subsystem and a PLC (programmable logic controller) for controlling the steam conditioning system on line;

the water replenishing subsystem comprises a high-pressure steam distributing cylinder connected with a converter steam inlet pipeline through a pipeline, and a plurality of heat accumulators connected with steam outlets of the high-pressure steam distributing cylinder through pipelines, wherein water outlets of the heat accumulators are connected with the water replenishing subsystem through circulating water pipelines, and circulating water pipelines are sequentially provided with a circulating pump for exchanging heat between high-temperature circulating water and pure water and pumping the circulating water after heat exchange into the water replenishing subsystem and a circulating water flow meter for measuring the flow rate of the circulating water; the controlled end of the circulating pump is connected with the output end of the PLC controller, and the output end of the circulating water flowmeter is connected with the input end of the PLC controller; the steam supplementing subsystem is connected with the water return ports of the heat accumulators through water return pipelines, and the water inlets of the heat accumulators are connected to the condensed water pipe through water supplementing pipelines;

the steam supplementing subsystem comprises a low-pressure steam distributing cylinder and a boiler, wherein the low-pressure steam distributing cylinder is connected with steam outlets of heat accumulators in the steam supplementing subsystem through pipelines, and the boiler is connected with the steam outlets of the low-pressure steam distributing cylinder through saturated steam pipelines; the boiler is connected with three burners for heating the boiler, and a first economizer, a second economizer, a third economizer and a superheater positioned between the first economizer and the second economizer which are connected through pipelines are sequentially arranged in the boiler in a way of conforming to the traveling direction of flue gas generated by the combustion of the burners; the water inlet of the third economizer is connected with a circulating water pipeline, and the water outlet of the first economizer is connected with a water return pipeline; the steam inlet of the superheater is connected with the steam outlet of the low-pressure steam-distributing cylinder through a saturated steam pipeline, the steam outlet of the superheater is connected with the steam-water separator through a main steam pipeline, and the main steam pipeline is connected with the jet pump through a communicated main steam branch pipeline; a low-pressure steam inlet of the jet pump is connected with a steam inlet pipeline of the heating furnace through a steam supplementing pipeline, and a steam outlet of the jet pump is connected with a steam turbine through the steam supplementing pipeline;

the air distribution subsystem comprises an air preheater which is connected with the variable-frequency combustion fan through an air inlet pipeline and is used for preheating air; the variable-frequency combustion-supporting fan is interlocked with the flue gas pressure at the flue gas outlet of the air preheater, and the controlled end of the variable-frequency combustion-supporting fan is connected with the output end of the PLC; the gas inlet of the air preheater is connected with a boiler in the steam supplementing subsystem through a gas inlet pipeline, the gas outlet of the air preheater is connected with a variable frequency induced draft fan for extracting the gas in a boiler hearth through a gas outlet pipeline, the variable frequency induced draft fan is interlocked with the pressure in the hearth, and the controlled end of the variable frequency induced draft fan is connected with the output end of the PLC; the hot air outlet of the air preheater is respectively connected with the three burners through a hot air pipeline, three hot air branch pipelines, three primary air pipelines and three secondary air pipelines which are sequentially communicated; the primary air pipeline is provided with a primary air electric regulating valve for regulating the primary air quantity of the burner nozzle of the coal burner, the primary air electric regulating valve is interlocked with the front gas flow, the air flow and the air pressure of the burner nozzle of the corresponding burner, and the controlled end of the primary air electric regulating valve is connected with the output end of the PLC; a secondary air manual regulating valve for regulating the secondary air quantity in front of a burner nozzle of the coal burner is arranged on the secondary air pipeline; the hot air outlet of the air preheater is connected with the hearth through a cold air pipeline communicated with the hot air pipeline, a cold air mixing electric regulating valve used for controlling the amount of cold air entering the hearth is arranged on the cold air pipeline, the cold air mixing electric regulating valve is linked with the temperature in the hearth, and the controlled end of the cold air mixing electric regulating valve is connected with the output end of the PLC.

Preferably, the pipelines of the steam outlet of the heat accumulator in the water replenishing subsystem are provided with steam outlet adjusting electric valves for controlling the internal pressure of the heat accumulator and adjusting the steam outlet quantity of the heat accumulator; the steam outlet adjusting electric valve is interlocked with the liquid level of the corresponding heat accumulator, and the controlled end of the steam outlet adjusting electric valve is connected with the output end of the PLC.

Preferably, a superheater outlet remote pressure gauge for measuring the steam pressure of a superheater outlet header is arranged at a superheater outlet in the steam supplementing subsystem, the superheater outlet remote pressure gauge is interlocked with the flow of the burner front coal gas of the burner, and the output end of the superheater outlet remote pressure gauge is connected with the input end of the PLC.

Preferably, a high-pressure steam pressure regulating valve for regulating the amount of main steam entering the injection pump is arranged on a main steam branch pipeline in the steam supplementing subsystem, the high-pressure steam pressure regulating valve is interlocked with the steam pressure after injection, and the controlled end of the high-pressure steam pressure regulating valve is connected with the output end of the PLC.

Preferably, a steam outlet of the injection pump in the steam supplementing subsystem is provided with a post-injection steam pressure gauge for measuring the pressure of low-pressure steam after injection, and the output end of the post-injection steam pressure gauge is connected with the input end of the PLC.

Preferably, a steam supplementing port of a steam turbine in the steam supplementing subsystem is provided with a steam supplementing port pressure gauge for measuring steam supplementing pressure of the steam supplementing port of the steam turbine, and an output end of the steam supplementing port pressure gauge of the steam turbine is connected with an input end of the PLC.

Preferably, a flue gas pressure gauge for measuring the flue gas pressure at the flue gas outlet of the air preheater is arranged on the flue gas outlet pipeline in the air distribution subsystem, and the output end of the flue gas pressure gauge is connected with the input end of the PLC.

Preferably, two hearth pressure meters used for measuring the pressure in the hearth and two hearth temperature meters used for measuring the temperature in the hearth are symmetrically arranged in the lower part of the hearth in the air distribution subsystem, the output end of the hearth pressure meter is connected with the input end of the PLC, and the output end of the hearth temperature meter is connected with the input end of the PLC.

Preferably, three burners in the air distribution subsystem are connected with gas and natural gas through pipelines, three branch pipelines connected with the gas are respectively provided with a nozzle front branch gas pipeline electric regulating valve used for controlling the flow of the nozzle front gas, and the controlled end of the nozzle front branch gas pipeline electric regulating valve is connected with the output end of the PLC.

Preferably, a burner front air flow meter for measuring the flow of air in front of the burner is arranged on each hot air branch pipeline in the air distribution subsystem, and the output end of the burner front air flow meter is connected with the input end of the PLC; and a primary air remote transmission pressure gauge for measuring the air pressure in front of the burner is arranged on each primary air pipeline, and the output end of the primary air remote transmission pressure gauge is connected with the input end of the PLC.

Due to the adoption of the technical scheme, the utility model has the following technical progress.

The utility model can fully recover the heat energy of the converter through the water replenishing subsystem and control the flow rate of the circulating water; the steam supplementing subsystem can utilize circulating water of the water supplementing subsystem to generate superheated steam, so that the defect that the low-pressure steam distributing cylinder recovers converter waste heat steam to provide steam for the generator set can be overcome; the air distribution subsystem reasonably distributes air to the boiler and the burner, so that the temperature and the pressure in the boiler are effectively controlled, the reasonable air distribution point is effectively controlled to fully combust the fuel, and the fuel resource is saved; through the cooperation among all subsystems, the steam can be continuously, stably and sufficiently supplied to the steam turbine generator unit, and the normal, stable and efficient operation of the steam turbine generator unit is realized; through setting up the PLC controller, degree of automation is high, the security is high.

Drawings

FIG. 1 is a schematic structural view of a water supplement subsystem and a steam supplement subsystem of the present invention;

FIG. 2 is a schematic view of the structure at the position A of the present invention;

FIG. 3 is a schematic structural view of the air distribution subsystem of the present invention;

fig. 4 is a schematic diagram of the structure at B of the present invention.

Wherein: 1. the system comprises a low-pressure gas distributing cylinder, 2 high-pressure gas distributing cylinders, 3 heat accumulators, 4 steam outlet adjusting electric valves, 41 steam outlet gate valves, 42 steam outlet bypass valves, 5 coal economizers, 6 circulating water pipelines, 61 circulating pumps, 62 standby circulating pumps, 63 circulating water flow meters, 8 water return pipelines, 81 water return branch pipelines, 82 water return adjusting electric valves, 9 water replenishing pipelines, 10 superheaters, 11 boilers, 111 hearth furnaces, 12 frequency conversion combustion-supporting fans, 13 air preheaters, 131 air inlet pipelines, 132 flue gas inlet pipelines, 133 flue gas outlet pipelines, 134 cold air pipelines, 135 hot air pipelines, 136 hot air branch pipelines, 137 primary air pipelines, 138 secondary air pipelines, 14 frequency conversion induced draft fans, 15 burners I, 16 burners II, 17 burners III, 18 primary air power adjusting valves, 19 secondary air manual adjusting valves, 19 primary air manual adjusting valves, and a secondary air manual adjusting valve, 20. The system comprises a burner front branch gas pipeline electric regulating valve, a 21 cold air mixing electric regulating valve, a 22 burner front air flow meter, a 23 saturated steam pipeline, a 24 main steam pipeline, a 25 main steam branch pipeline, a 26 high-pressure steam pressure regulating valve, a 27 steam supplementing pipeline, a 28 low-pressure steam pressure regulating valve, a 29 injection pump, a 30 superheater outlet remote pressure gauge, a 31 injection rear steam pressure gauge, a 32 steam supplementing speed closing regulating valve and a 33 steam turbine steam supplementing port pressure gauge.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

A steam conditioning system for recovering converter waste heat is shown in a combined mode in fig. 1-4 and comprises a high-pressure steam distributing cylinder 2, a heat accumulator 3, a low-pressure steam distributing cylinder 1, a boiler 11, an injection pump 29, an air preheater 13, a variable-frequency combustion fan 12, a variable-frequency induced draft fan 14 and a PLC (programmable logic controller) for controlling the system on line. The boiler 11 is connected with three burners, a first economizer 5, a second economizer 5, a third economizer 5 and a superheater 10 positioned between the first economizer 5 and the second economizer 5 are sequentially arranged in the boiler 11 in a direction conforming to the traveling direction of flue gas generated by the burners, and the three economizers 5 are sequentially connected through a pipeline.

The steam inlet of the high-pressure gas distributing cylinder 2 is connected with a converter steam inlet pipeline through a pipeline, the steam outlet of the high-pressure gas distributing cylinder 2 is connected with the steam inlets of the two heat accumulators 3 through pipelines (the number of the heat accumulators 3 connected with each high-pressure gas distributing cylinder 2 can be changed according to actual demand conditions), the water outlet of each heat accumulator 3 is connected with the water inlet of the third economizer 5 through a circulating water pipeline 6, the water outlet of the first economizer 5 is connected with the water return port of the heat accumulator 3 through a water return pipeline 8, and the water inlet of each heat accumulator 3 is connected with a condensate pipe through a water replenishing pipeline 9 to form a water replenishing subsystem.

The steam inlet of the low-pressure steam distributing cylinder 1 is connected with the steam outlet of each heat accumulator 3 through a pipeline, the steam outlet of the low-pressure steam distributing cylinder 1 is connected with the steam inlet of the superheater 10 through a saturated steam pipeline 23, and the steam outlet of the superheater 10 is connected with a steam-water separator through a main steam pipeline 24; the main steam pipe 24 is connected with an injection pump 29 through a main steam branch pipe 25 which is communicated; the low-pressure steam inlet of the jet pump 29 is connected with a steam inlet pipeline of the heating furnace through a steam supplementing pipeline 27, and the steam outlet of the jet pump 29 is connected with a steam turbine through the steam supplementing pipeline 27 to form a steam supplementing subsystem.

The air inlet of the air preheater 13 is connected with the variable-frequency combustion fan 12 through an air inlet pipeline 131; the flue gas inlet of the air preheater 13 is connected with the boiler 11 through a flue gas inlet pipeline 132; the smoke outlet of the air preheater 13 is connected with a variable-frequency induced draft fan 14 through a smoke outlet pipeline 133; the hot air outlet of the air preheater 13 is connected with three burners through a hot air pipeline 135, three hot air branch pipelines 136, three primary air pipelines 137 and three secondary air pipelines 138 which are sequentially communicated; the hot air outlet of the air preheater 13 is connected with the hearth 111 at the bottom of the boiler 11 through a cold air pipeline 134 communicated with a hot air pipeline 135 to form an air distribution subsystem.

The number of the high-pressure gas distributing cylinders 2 is set according to the number of the converters, and the high-pressure gas distributing cylinders are used for distributing converter incoming gas with high temperature to the heat accumulators 3. The high-pressure branch cylinders 2 can be communicated through pipelines, so that the steam distribution quantity of the regenerator 3 under the incoming steam of different converters can be adjusted when the incoming steam of each converter is unbalanced.

A water taking hand valve is arranged on a water outlet of the heat accumulator 3 and is in a normally open state. When the pressure in the heat accumulator 3 is increased due to the increase of steam, water is discharged from the water outlet through the water outlet branch pipeline, and the discharged water is collected into the circulating water pipeline 6 as circulating water. The circulating water pipeline 6 is sequentially provided with a circulating water temperature meter TE701, a circulating water remote pressure meter PT701, a Y-shaped filter, a circulating pump 61, a circulating pump outlet remote pressure meter PT702, a circulating pump outlet local pressure meter PG702 and a circulating water flow meter 63.

Circulating water temperature table TE701 is used for conveying the circulating water temperature of circulating pump entry end to the PLC controller, and the input of PLC controller is connected to circulating water temperature table TE 701's output. The circulating water remote pressure gauge PT701 is used for conveying the circulating water pressure at the inlet end of the circulating pump to the PLC, and the output end of the circulating water remote pressure gauge PT701 is connected with the input end of the PLC. The Y-shaped filter is used for removing impurities in the circulating water to protect the normal use of the circulating pump, and the Y-shaped filter is used for cleaning sand, soil, impurities and the like in the circulating pump before being put into use so as to prevent the mechanical seal from being damaged.

The high-temperature water inlet end and the low-temperature water outlet end of the circulating pump 61 are connected with the circulating water pipeline 6, and the low-temperature water inlet end and the high-temperature water outlet end of the circulating pump 61 are connected with the purified water pipeline. The circulating pump is used for exchanging heat between high-temperature circulating water and purified water, recovering heat resources, and pumping the circulating water after heat exchange into the economizer 5. Circulating water pipeline 6 is provided with the reserve circulating pump 62 parallelly connected with circulating pump 61 through the bypass pipeline, when circulating pump 61 breaks down, starts reserve circulating pump 62, when two circulating pump colleagues break down, and the system on-line control is shut down the protection, and the output of PLC controller is connected to the controlled end of circulating pump 61 and reserve circulating pump 62.

The high-temperature water inlet ends of the circulating pump 61 and the standby circulating pump 62 are provided with normally open inlet hand valves, and the inlet hand valves are used for manually switching on and off circulating water flowing into the circulating pump; the low-temperature water outlet ends of the circulating pump 61 and the standby circulating pump 62 are sequentially provided with a check valve and an outlet electric gate valve, wherein the check valve is used for blocking backflow of circulating water, the outlet electric gate valve is used for controlling opening and closing of the circulating pump in an online mode, and the controlled end of the outlet electric gate valve is connected with the output end of the PLC.

The remote pressure gauge PT702 at the outlet of the circulating pump is used for transmitting the circulating water pressure at the outlet of the circulating pump to the PLC so as to monitor the pressure value on line; the output end of the remote pressure gauge PT702 at the outlet of the circulating pump is connected with the input end of the PLC. Circulating pump export manometer PG702 on spot is used for the on-the-spot monitoring pressure value, and the circulating pump export manometer PG702 on spot can not appear the signal transmission deviation problem of electronic measurement original paper, and the deviation appears when two manometer numerical values, can remind operating personnel pressure to have a problem to help the maintenance system. Circulating water flowmeter 63 is used for measuring the circulating water flow, and the input of PLC controller is connected to the output of circulating water flowmeter 63.

The outlet of each coal economizer 5 is provided with an economizer outlet local pressure gauge and an economizer outlet remote pressure gauge. The remote pressure gauge at the outlet of the economizer is used for transmitting the pressure at the outlet of the economizer 5 to the PLC so as to monitor the pressure value on line; the output end of the long-distance pressure at the outlet of the economizer is connected with the input end of the PLC. The economizer export manometer in the spot is used for the on-the-spot monitoring pressure value, and the signal transmission deviation problem of electron measurement original paper can not appear in economizer export manometer in the spot, appears the deviation when two manometer numerical values, can remind operating personnel pressure to have the problem to help the maintenance system. The inlet end that circulating water pipeline 6 is connected to third economizer 5 is provided with and is used for conveying the thermometer of PLC controller with 5 entry temperatures of economizer who measures, and the input of PLC controller is connected to the output of thermometer.

The outlet of the first economizer 5 is connected to the return water port of the heat accumulator 3 through a return water pipe 8 and a return water branch pipe 81, and the circulating water is returned to the heat accumulator 3. Each return water branch pipeline 81 is provided with a return water adjusting electric valve 82, each return water adjusting electric valve 82 is used for controlling the return water amount of the corresponding heat accumulator 3, each return water adjusting electric valve 82 is interlocked with the liquid level of the corresponding heat accumulator 3, and the controlled end of each return water adjusting electric valve 82 is connected with the output end of the PLC. And a gate valve is arranged in front of and behind the backwater adjusting electric valve 82 and used for manually controlling on-off backwater, the gate valve is normally in an open state, and when the backwater adjusting electric valve 82 breaks down, the gate valve is closed, and the steam outlet adjusting electric valve 82 is overhauled. Each water return branch pipeline 81 is also communicated with a bypass pipeline, a bypass valve is arranged on each bypass pipeline, the bypass valve is normally in a closed state, and when the steam outlet adjusting electric valve 82 breaks down, the gate valve is closed, the bypass valve is opened, and the normal operation of the system is guaranteed.

The water inlet of the heat accumulator 3 is connected to a water replenishing pipeline 9 through a water replenishing branch pipeline, the water replenishing pipeline 9 is communicated with a condensed water pipe, and the condensed water pipe is connected to a steam turbine condenser hot water well. The condensed water is pressurized by the condensed water pump, enters the heat accumulator 3 through the water replenishing pipeline 9 and the water replenishing branch pipeline, and is replenished for the heat accumulator 3. And a water replenishing branch pipeline connected with the water inlet of each heat accumulator 3 is provided with a valve for switching on and off water replenishing, and when the pressure of the heat accumulator 3 is controlled and the requirement of the circulating water volume cannot be met, the heat accumulator 3 is replenished with water.

The heat accumulator 3 is filled with water with the same liquid level at normal pressure, a steam outlet adjusting electric valve 4 is arranged on a pipeline of a steam outlet of the heat accumulator 3, and the steam outlet adjusting electric valve 4 is used for adjusting the steam outlet quantity in the heat accumulator 3. The steam outlet adjusting electric valve 4 is interlocked with the liquid level of the corresponding heat accumulator 3 and is connected with a PLC controller, and the PLC controller is used for controlling the opening of the steam outlet adjusting electric valve according to the liquid level in the heat accumulator 3, so that the pressure in each heat accumulator 3 is kept the same and the liquid level is the same, and the water outlet quantity of the water outlet of the heat accumulator 3 is controlled to be uniform. The controlled end of the steam outlet adjusting electric valve 4 is connected with the output end of the PLC controller.

Referring to fig. 2, a steam outlet gate valve 41 is respectively arranged in front of and behind the steam outlet adjusting electric valve 4 through pipeline connection, and the steam outlet gate valves 41 are used for switching on and off steam flowing into the low pressure steam distributing cylinder 1. The steam outlet gate valve 41 is normally in an open state, and when the steam outlet adjusting electric valve 4 fails, the steam outlet gate valve 41 is closed, and the steam outlet adjusting electric valve 4 is overhauled.

A bypass pipeline is arranged between the heat accumulator 3 and the low-pressure steam distributing cylinder 1, a steam outlet bypass valve 42 connected with the steam outlet adjusting electric valve 4 and the steam outlet gate valve 41 in parallel is arranged on the bypass pipeline, the steam outlet bypass valve 42 is normally in a closed state, when the steam outlet adjusting electric valve 4 breaks down, the steam outlet gate valve 41 is closed, the steam outlet bypass valve 42 is opened, and the normal operation of the system is guaranteed.

A saturated steam pipe 23 of which the steam outlet of the low-pressure steam distributing cylinder 1 is connected to the steam inlet of the superheater 10 is provided with a superheater inlet electric gate valve, and the superheater inlet electric gate valve is used for switching on and off the steam coming out of the low-pressure steam distributing cylinder 1 and entering the superheater 10.

The superheater 10 is used for superheating saturated steam into superheated steam for the steam turbine, a steam outlet of the superheater 10 is connected with a steam-water separator through a main steam pipeline 24, and a steam outlet of the steam-water separator is connected with a main steam port of the steam turbine. The steam-water separator is used for separating steam from water of the superheated steam. The outlet of the superheater 10 is sequentially provided with a superheated steam outlet relief valve, a superheater outlet remote thermometer, a superheater outlet local pressure gauge, a superheater outlet remote pressure gauge and a superheater outlet remote pressure gauge 30. The superheated steam outlet relief valve is interlocked with the remote pressure of the superheater outlet, when the pressure of the outlet of the superheater 10 is overlarge, the superheated steam outlet relief valve is automatically opened for pressure relief, and the controlled end of the superheated steam outlet relief valve is connected with the output end of the PLC; the superheater outlet remote thermometer is used for monitoring the superheater outlet temperature, and the output end of the superheater outlet remote thermometer is connected with the input end of the PLC; the superheater outlet local pressure gauge is used for monitoring the pressure value on site; the superheater outlet remote pressure gauge 30 is used for measuring the steam pressure of a superheater outlet header, and the superheater outlet remote pressure gauge 30 is interlocked with the gas flow in front of a burner nozzle of a burner and used for combustion control to increase and decrease fuel to ensure the steam point temperature for the steam turbine; the output end of the superheater outlet remote pressure gauge 30 is connected with the input end of the PLC controller. The signal transmission deviation problem of electron measurement original paper can not appear in the manometer on the spot, and the deviation appears when two blocks of manometer numerical values, can remind operating personnel pressure to have the problem to help maintaining the system.

And a superheater outlet electric gate valve is arranged on the main steam pipeline 24 and is used for switching the superheated steam coming out of the superheater 10 into a steam-water separator. A connecting pipeline is communicated between the saturated steam pipe 23 and the main steam pipeline 24, and the communicating points are positioned at the steam inlet end of the electric gate valve at the inlet of the superheater and the steam outlet end of the electric gate valve at the outlet of the superheater. The connecting pipeline is provided with an electric connecting gate valve for an inlet and an outlet of the superheater, and the electric connecting gate valve for the inlet and the outlet of the superheater is used for adjusting the flow direction of saturated steam and superheated steam.

The main steam pipe 24 is connected to the high-pressure steam inlet of the jet pump 29 near the outlet end of the superheater 10 through a main steam branch pipe 25. The main steam branch pipe 25 is sequentially provided with a high-pressure steam pressure regulating valve 26 and a high-pressure steam pressure gauge in front of the injection pump. The high pressure steam pressure regulating valve 26 is used to regulate the amount of main steam entering the jet pump 29. The high-pressure steam pressure regulating valve 26 is interlocked with the steam pressure after injection, and the controlled end of the high-pressure steam pressure regulating valve 26 is connected with the output end of the PLC. The injection pump front high-pressure steam pressure gauge is used for transmitting the injection pump front high-pressure steam pressure to the PLC so as to monitor the pressure value on line; the output end of the high-pressure steam pressure gauge in front of the jet pump is connected with the input end of the PLC controller.

The low-pressure steam inlet of the jet pump 29 is connected with a heating furnace steam inlet pipeline through a steam supplementing pipeline 27, and a low-pressure steam pressure gauge in front of the jet pump, a low-pressure steam pressure regulating valve 28, a steel rolling heating furnace steam temperature gauge and a steel rolling heating furnace steam pressure gauge are sequentially arranged between the jet pump 29 and the heating furnace steam inlet pipeline through the steam supplementing pipeline 27.

The low-pressure steam pressure gauge in front of the injection pump is used for transmitting the steam of the heating furnace in front of the injection pump to the PLC so as to monitor the pressure value on line; the output end of the low-pressure steam pressure gauge in front of the jet pump is connected with the input end of the PLC controller. The low-pressure steam pressure regulating valve 28 is used for regulating the steam pressure of the heating furnace, and the controlled end of the low-pressure steam pressure regulating valve 28 is connected with the output end of the PLC controller. The front and the back of the low-pressure steam pressure regulating valve 28 are respectively provided with a gate valve through pipeline connection, and the gate valves are used for switching on and off the steam of the heating furnace. The gate valve is normally in an open state, and when the low-pressure steam pressure regulating valve 28 fails, the gate valve is closed, and the low-pressure steam pressure regulating valve 28 is overhauled. The steam compensating pipeline 27 is communicated with a bypass pipeline, a bypass valve connected with the low-pressure steam pressure regulating valve 28 and the gate valve in parallel is arranged on the bypass pipeline, the bypass valve is normally in a closed state, and when the low-pressure steam pressure regulating valve 28 fails, the gate valve is closed, the bypass valve is opened, and normal operation of the system is guaranteed. The steel rolling heating furnace steam temperature gauge and the steel rolling heating furnace steam pressure gauge are respectively used for transmitting the heating furnace steam temperature and the heating furnace steam pressure to the PLC so as to monitor the pressure value on line; the output end of the steel rolling heating furnace steam temperature gauge and the output end of the steel rolling heating furnace steam pressure gauge are connected with the input end of the PLC.

The steam outlet of the jet pump 29 is connected with the steam supplementing port of the steam turbine through a steam supplementing pipeline 27. The steam supplementing pipeline 27 between the jet pump 29 and the steam turbine is sequentially provided with a jet pump rear steam temperature meter, a jet rear steam pressure meter 31, a steam supplementing speed closing regulating valve 32, a steam turbine steam supplementing port pressure meter 33 and a steam turbine steam supplementing port steam inlet temperature meter.

And the injection pump rear steam temperature meter is used for transmitting the injection rear low-pressure steam temperature to the PLC so as to monitor the pressure value on line. The steam pressure gauge 31 after spraying is used for transmitting the pressure of the low-pressure steam after spraying to the PLC, and the output end of the steam pressure gauge 31 after spraying is connected with the input end of the PLC. The low-pressure steam after the steam supplementing quick closing regulating valve 32 is quickly opened and closed and sprayed enters a steam supplementing port of the steam turbine, the steam supplementing quick closing regulating valve 32 is interlocked with steam supplementing pressure of the steam supplementing port of the steam turbine, and the controlled end of the steam supplementing quick closing regulating valve 32 is connected with the output end of the PLC. The steam turbine steam supplementing port pressure gauge 33 is used for transmitting steam supplementing pressure of the steam turbine steam supplementing port to the PLC so as to monitor a pressure value on line. The output end of the steam turbine steam supplementing port pressure gauge 33 is connected with the input end of the PLC.

Thermometers are arranged between the three economizers 5 and the superheater 10 and between the third economizer 5 and the furnace 111, the thermometers are used for measuring the smoke temperature in the furnace between every two economizers, the output end of each thermometer is connected with the input end of the control device, the thermometers between the third economizer 5 and the furnace 111 alarm in a linkage mode, and when the smoke temperature is lowered to a certain value, the system alarms. Two hearth pressure meters and two hearth temperature meters are symmetrically arranged between the first economizer 5 and the hearth 111. The furnace manometer is used for measuring the pressure in furnace 111, and the furnace thermometer is used for measuring the temperature in furnace 111, and the input of PLC controller is connected to the output of furnace manometer, and the input of PLC controller is connected to the output of furnace thermometer. The bottom of the hearth 111 is connected with three burners, fire observation holes are formed in the side wall of the hearth 111, and the combustion state of burner nozzles of the burners can be observed through the fire observation holes.

The flue gas inlet of the air preheater 13 is connected with the flue gas outlet of the boiler 11 through a flue gas inlet pipeline 132, the flue gas outlet of the air preheater 13 is connected with a variable frequency induced draft fan 14 through a flue gas outlet pipeline 133, and the variable frequency induced draft fan 14 is connected with a chimney through a pipeline. The smoke outlet pipeline 133 is provided with a smoke pressure gauge for measuring the smoke pressure at the smoke outlet of the air preheater 13 and a smoke temperature gauge for measuring the smoke temperature at the smoke outlet. The output end of the flue gas pressure gauge is connected with the input end of the PLC; the output end of the flue gas thermometer is connected with the input end of the PLC controller. The frequency conversion draught fan 14 is used for extracting high-temperature flue gas generated by heating of the burner in the hearth 111, and the high-temperature flue gas is subjected to heat exchange through the air preheater 13 and then is pumped into a chimney by the frequency conversion draught fan 14 to be exhausted to the atmosphere. The variable frequency induced draft fan 14 is interlocked with the pressure in the hearth 111, the negative pressure of the hearth 111 is controlled by adjusting the frequency of the induced draft fan, and the controlled end of the variable frequency induced draft fan 14 is connected with the output end of the PLC.

The air inlet of the air preheater 13 is connected with a variable-frequency combustion-supporting fan 12 through an air inlet pipeline 131, the variable-frequency combustion-supporting fan 12 is used for blowing air to the air preheater 13, the variable-frequency combustion-supporting fan 12 is interlocked with the smoke pressure of the smoke outlet of the air preheater 13, the frequency of a variable-frequency blower is controlled through the smoke pressure of the smoke outlet, so that the smoke pressure of the smoke outlet of the air preheater 13 is adjusted, and the controlled end of the variable-frequency combustion-supporting fan 12 is connected with the output end of a PLC (programmable logic controller). And a combustion fan outlet air pressure gauge is arranged on the air inlet pipeline 131, the combustion fan outlet air pressure is used for monitoring the combustion fan outlet air pressure, and the output end of the combustion fan outlet air pressure gauge is connected with the input end of the PLC.

The cold air duct 134, which connects the hot air outlet of the air preheater 13 with the furnace 111, is sequentially provided with a cold air doping manual butterfly valve, a cold air doping electric regulating valve 21, a cold air pressure gauge and a cold air temperature gauge, when the temperature in the furnace 111 is too high, the air preheater 13 dopes cold air to the furnace 111 (the cold air is the hot air preheated by the air preheater 13, and the temperature of the hot air is much lower than the temperature in the furnace 111, so the air is called as cold air), thereby reducing the furnace 111. The cold air mixing manual butterfly valve is used for switching on and off cold air and is in a normally open state. The cold air mixing electric regulating valve 21 is used for regulating the opening of the valve and controlling the inflow amount of cold air so as to control the temperature in the hearth 111, the cold air mixing electric regulating valve 21 is linked with the temperature in the hearth 111, and the controlled end of the cold air mixing electric regulating valve 21 is connected with the output end of the PLC.

Referring to fig. 4, the hot air duct 135 connecting the hot air outlet of the air preheater 13 to the burners is connected to three hot air branch ducts 136, and each hot air branch duct 136 is connected to each burner through a primary air duct 137 and a secondary air duct 138. Each hot air branch pipeline 136 is sequentially provided with a burner air manual butterfly valve and a burner front air flow meter 22. The manual butterfly valve of nozzle air is used for the hot-blast of each hot-blast branch pipeline 136 of break-make, and is the normally open state. The burner front air flow meter 22 is used for measuring the air flow in each hot air branch pipeline 136, and the output end of the burner front air flow meter 22 is connected with the input end of the PLC controller.

Each primary air pipeline 137 is sequentially provided with a primary air electric regulating valve 18, a primary air local pressure gauge and a primary air remote transmission pressure gauge. The primary wind electric control valves 18 are used for adjusting primary wind amount in front of the burner of the coal burner so as to control air flow and pressure in front of the burner of the coal burner, each primary wind electric control valve 18 is interlocked with the gas flow, the air flow and the air pressure in front of the burner of the corresponding burner, and the controlled end of each primary wind electric control valve 18 is connected with the output end of the PLC. The primary air local pressure gauge is used for monitoring the primary air pressure value on site. The primary air remote transmission pressure gauge is used for transmitting a primary air pressure value to the PLC so as to monitor the pressure value on line, and the output end of the primary air remote transmission pressure is connected with the input end of the PLC. The signal transmission deviation problem of electronic measurement original paper can not appear in the wind manometer on the spot, and the deviation appears when two blocks of manometer numerical values, can remind operating personnel that pressure has the problem to help maintaining the system.

Each secondary air pipeline 138 is sequentially provided with a secondary air manual regulating valve 19 and a secondary air local pressure gauge. The secondary air manual regulating valve 19 is used for regulating the secondary air quantity in front of the burner of the coal burner. The secondary air on-site pressure gauge is used for monitoring the pressure value of the secondary air on site.

The three burners are connected with coal gas and natural gas through pipelines, three branch pipelines connected with the coal gas are respectively provided with a nozzle front branch coal gas pipeline electric adjusting valve 20, the nozzle front branch coal gas pipeline electric adjusting valves 20 are used for controlling the flow of the nozzle front coal gas, and the controlled end of each nozzle front branch coal gas pipeline electric adjusting valve 20 is connected with the output end of the PLC.

The pipeline for connecting the coal gas is connected with a nitrogen pipeline, a sampling pipeline and a diffusing pipeline. The nitrogen pipeline is used for introducing nitrogen into the gas pipeline for purging; the sampling pipeline is used for sampling to perform an explosion experiment or an assay; the bleeding line is used for discharging gas in the line during purging or discharging nitrogen during gas replacement.

The PLC is used for controlling the system on line, monitoring and recording data of each meter, and giving an alarm when the data transmitted from the meters exceeds the limit in time, so as to prompt related personnel and contribute to the automation and the safety of the system.

When the utility model is used, before the ignition of the burner is started, the fuel replacement work of the fuel pipeline is strictly carried out according to the regulations, the explosion test is carried out, and the ignition operation can be carried out after the fuel pipeline is qualified; starting the variable-frequency combustion-supporting fan 12, setting the air supply pressure of the variable-frequency combustion-supporting fan, and automatically operating the air supply machine by throwing constant air pressure to blow air into the air preheater 13; starting the variable-frequency draught fan 14, setting the negative pressure of a hearth of the variable-frequency draught fan 14, and automatically operating the variable-frequency draught fan 14 at a constant negative pressure; in order to prevent the boiler 11 pipes from being burnt after ignition, the heat accumulator 3 is filled with water at normal pressure, and the circulating water pump is started to ensure the flow of circulating water; confirming the opening degree and the position of the manual valve on site, carrying out 300-second furnace chamber purging work, and finishing the ignition preparation stage after purging. The ignition sequence is sequentially a second burner 16, a first burner 15 and a third burner 17.

The high-pressure steam distributing cylinder 2 distributes converter incoming steam to each heat accumulator 3; the heat accumulators 3 store heat energy in the form of saturated water, and the pressure and the liquid level in the heat accumulators 3 are controlled through the steam outlet adjusting electric valve 4, so that water is uniformly discharged from water outlets in the heat accumulators, and the flow value of circulating water is met; when the circulating water flow value can not meet the requirement, the circulating water flow can meet the requirement by supplementing water through the condensed water connected with the water inlet of the heat accumulator 3.

The low-pressure steam distributing cylinder 1 conveys saturated steam to the superheater 10 to be superheated into superheated steam, the amount of the superheated steam cannot meet the requirement of continuous and sufficient supply to a steam turbine, the boiler 11 uniformly heats circulating water in the economizer 5 through three combustors to generate saturated steam, and the saturated steam is superheated into superheated steam through the superheater 10. The superheated steam is mainly conveyed to the steam-water separator through a pipeline to be subjected to steam-water separation and then supplied to a main steam port of the steam turbine, and the small part of the superheated steam is conveyed to the injection pump 29 through a pipeline, is mixed with steam from the heating furnace through the injection pump 29 and is injected into low-pressure steam, and then is supplied to a steam supplementing port of the steam turbine.

In the heating process, hot air output by the air preheater 13 is conveyed to a burner of the burner through a hot air pipeline 135, a hot air branch pipeline 136, a primary air pipeline 137 and a secondary air pipeline 138, the opening degree of the gas flow in front of the burner is controlled through the arranged air flow in front of the burner, which is displayed by a burner front air flow meter 22, the air pressure in front of the burner, which is displayed by a primary air remote transmission pressure meter, and a burner front branch gas pipeline electric regulating valve 20, the opening degree of a primary air electric regulating valve 18 is gradually regulated, and the air is reasonably distributed to the burner, so that the gas and the air are fully combusted; with the increase of the temperature of the furnace 111 due to sufficient combustion, when the temperature in the furnace 111 is too high, the hot air output by the air preheater 13 is conveyed to the furnace 111 through the cold air pipe 134 to cool the furnace 111; the flue gas generated in the combustion process is extracted by a variable frequency induced draft fan 14, and is discharged into a chimney after heat exchange by an air preheater 13.

Claims (10)

1. A steam quenching and tempering system for converter waste heat recovery, its characterized in that: the system comprises a water supplementing subsystem for providing circulating water for a steam conditioning system, a steam supplementing subsystem for supplementing steam for the steam conditioning system, an air distribution subsystem for distributing air for the steam supplementing subsystem and a PLC (programmable logic controller) for controlling the steam conditioning system on line;

the water replenishing subsystem comprises a high-pressure steam distributing cylinder (2) connected with a converter steam inlet pipeline through a pipeline, and a plurality of heat accumulators (3) connected with steam outlets of the high-pressure steam distributing cylinder (2) through pipelines, and water outlets of the heat accumulators (3) are connected with the water replenishing subsystem through circulating water pipelines (6); the circulating water pipeline (6) is sequentially provided with a circulating pump for exchanging heat between high-temperature circulating water and purified water and pumping the circulating water after heat exchange into the steam supplementing subsystem and a circulating water flow meter (63) for measuring the flow rate of the circulating water; the controlled end of the circulating pump is connected with the output end of the PLC, and the output end of the circulating water flowmeter (63) is connected with the input end of the PLC; the steam supplementing subsystem is connected with the water return port of each heat accumulator (3) through a water return pipeline (8), and the water inlet of each heat accumulator (3) is connected to a condensed water pipe through a water supplementing pipeline (9);

the steam supplementing subsystem comprises a low-pressure steam distributing cylinder (1) connected with steam outlets of the heat accumulators (3) in the steam supplementing subsystem through pipelines and a boiler (11) connected with the steam outlets of the low-pressure steam distributing cylinder (1) through saturated steam pipelines (23); the boiler (11) is connected with three burners for heating the boiler, a first economizer (5), a second economizer (5), a third economizer (5) and a superheater (10) positioned between the first economizer and the second economizer (5), which are connected through pipelines, are sequentially arranged in the boiler (11) in a way of conforming to the traveling direction of flue gas generated by the combustion of the burners; the water inlet of the third economizer (5) is connected with a circulating water pipeline (6), and the water outlet of the first economizer (5) is connected with a water return pipeline (8); a steam inlet of the superheater (10) is connected with a steam outlet of the low-pressure steam-distributing cylinder (1) through a saturated steam pipeline (23), a steam outlet of the superheater (10) is connected with a steam-water separator through a main steam pipeline (24), and the main steam pipeline (24) is connected with an injection pump (29) through a communicated main steam branch pipeline (25); a low-pressure steam inlet of the jet pump (29) is connected with a heating furnace steam supply pipeline through a steam supply pipeline (27), and a steam outlet of the jet pump (29) is connected with a steam turbine through the steam supply pipeline (27);

the air distribution subsystem comprises an air preheater (13) which is connected with a variable-frequency combustion fan (12) through an air inlet pipeline (131) and is used for preheating air; the variable-frequency combustion-supporting fan (12) is interlocked with the flue gas pressure at the flue gas outlet of the air preheater (13), and the controlled end of the variable-frequency combustion-supporting fan (12) is connected with the output end of the PLC; a smoke inlet of the air preheater (13) is connected with a boiler (11) in the steam compensation subsystem through a smoke inlet pipeline (132), a smoke outlet of the air preheater (13) is connected with a variable-frequency induced draft fan (14) used for extracting smoke in a hearth (111) of the boiler (11) through a smoke outlet pipeline (133), the variable-frequency induced draft fan (14) is interlocked with the pressure in the hearth (111), and a controlled end of the variable-frequency induced draft fan (14) is connected with an output end of the PLC; the hot air outlet of the air preheater (13) is respectively connected with the three burners through a hot air pipeline (135), three hot air branch pipelines (136), three primary air pipelines (137) and three secondary air pipelines (138) which are sequentially communicated; a primary air electric regulating valve (18) for regulating the primary air quantity of the burner of the coal burner is arranged on the primary air pipeline (137), the primary air electric regulating valve (18) is interlocked with the burner front gas flow, the air flow and the air pressure of a corresponding burner, and the controlled end of the primary air electric regulating valve (18) is connected with the output end of the PLC controller; a secondary air manual regulating valve (19) for regulating the secondary air quantity in front of a burner of the coal burner is arranged on the secondary air pipeline (138); the hot air outlet of the air preheater (13) is connected with the hearth (111) through a cold air pipeline (134) communicated with a hot air pipeline (135), a cold air mixing electric regulating valve (21) used for controlling the amount of cold air entering the hearth (111) is arranged on the cold air pipeline (134), the cold air mixing electric regulating valve (21) is linked with the temperature in the hearth (111), and the controlled end of the cold air mixing electric regulating valve (21) is connected with the output end of the PLC.

2. The steam conditioning system for converter waste heat recovery of claim 1, characterized in that: a steam outlet adjusting electric valve (4) for controlling the internal pressure of the heat accumulator (3) and adjusting the steam outlet quantity of the heat accumulator (3) is arranged on a pipeline of a steam outlet of the heat accumulator (3) in the water replenishing subsystem; the steam outlet adjusting electric valve (4) is interlocked with the liquid level of the corresponding heat accumulator (3), and the controlled end of the steam outlet adjusting electric valve (4) is connected with the output end of the PLC controller.

3. The steam conditioning system for converter waste heat recovery of claim 1, characterized in that: an outlet of the superheater (10) in the steam supplementing subsystem is provided with a superheater outlet remote pressure gauge (30) used for measuring the steam pressure of a superheater outlet header, the superheater outlet remote pressure gauge (30) is interlocked with the flow of the burner front coal gas of the burner, and the output end of the superheater outlet remote pressure gauge (30) is connected with the input end of the PLC.

4. The steam conditioning system for converter waste heat recovery of claim 1, characterized in that: a high-pressure steam pressure regulating valve (26) used for regulating the amount of main steam entering the jet pump (29) is arranged on a main steam branch pipeline (25) in the steam supplementing subsystem, the high-pressure steam pressure regulating valve (26) is interlocked with the steam pressure after jet, and the controlled end of the high-pressure steam pressure regulating valve (26) is connected with the output end of the PLC.

5. The steam conditioning system for converter waste heat recovery of claim 4, characterized in that: and a steam outlet of the injection pump (29) in the steam supplementing subsystem is provided with a post-injection steam pressure gauge (31) for measuring the pressure of low-pressure steam after injection, and the output end of the post-injection steam pressure gauge (31) is connected with the input end of the PLC.

6. The steam conditioning system for converter waste heat recovery of claim 1, characterized in that: and a steam supplementing port of a steam turbine in the steam supplementing subsystem is provided with a steam supplementing port pressure gauge (33) for measuring steam supplementing pressure of the steam supplementing port of the steam turbine, and the output end of the steam supplementing port pressure gauge (33) of the steam turbine is connected with the input end of the PLC.

7. The steam conditioning system for converter waste heat recovery of claim 1, characterized in that: and a flue gas pressure gauge for measuring the flue gas pressure at the flue gas outlet of the air preheater (13) is arranged on the flue gas outlet pipeline (133) in the air distribution subsystem, and the output end of the flue gas pressure gauge is connected with the input end of the PLC.

8. The steam conditioning system for converter waste heat recovery of claim 1, characterized in that: two hearth pressure meters used for measuring the pressure in the hearth (111) and two hearth thermometers used for measuring the temperature in the hearth (111) are symmetrically arranged in the lower portion of the hearth (111) in the air distribution subsystem, the output end of the hearth pressure meter is connected with the input end of the PLC, and the output end of the hearth thermometer is connected with the input end of the PLC.

9. The steam conditioning system for converter waste heat recovery of claim 1, characterized in that: three burners in the air distribution subsystem are connected with coal gas and natural gas through pipelines, three branch pipelines connected with the coal gas are provided with nozzle front branch coal gas pipeline electric regulating valves (20) used for controlling the flow of the nozzle front coal gas, and the controlled ends of the nozzle front branch coal gas pipeline electric regulating valves (20) are connected with the output end of the PLC.

10. The steam conditioning system for converter waste heat recovery of claim 1, characterized in that: a burner front air flow meter (22) for measuring the flow of air in front of the burner is arranged on each hot air branch pipeline (136) in the air distribution subsystem, and the output end of the burner front air flow meter (22) is connected with the input end of the PLC; each primary air pipeline (137) is provided with a primary air remote transmission pressure gauge for measuring the air pressure in front of the burner, and the output end of the primary air remote transmission pressure gauge is connected with the input end of the PLC.

Images