CN111649310A - A waste heat boiler and a high-efficiency recovery power generation system using the waste heat boiler - Google Patents

Abstract

The invention discloses a waste heat boiler and a high-efficiency recovery power generation system using the same, wherein the waste heat boiler comprises a preheating boiler hearth, the upper part of the preheating boiler hearth is provided with a high-temperature flue gas inlet, and a superheater, an evaporator and an economizer are sequentially arranged in the preheating boiler hearth from top to bottom; a reheater is arranged in parallel with the superheater; the boiler water supply is connected with an economizer, a header on the economizer is connected with a steam pocket, the boiler water supply enters the economizer for heating, and the boiler water supply is pumped into the steam pocket from a water inlet pipe through the header on the economizer; the water in the steam pocket descends in the descending pipe, the descending pipe is connected with the lower header of the evaporator and enters the evaporator for heat exchange, and the upper header of the evaporator is connected with the ascending pipe to the steam-water separator; the saturated steam outlet of the steam drum is connected with the lower header of the superheater, and the outlet of the upper header of the superheater is communicated with the main steam pipeline. The invention overcomes the inherent defects of serious ash deposition and serious abrasion of the traditional waste heat boiler and the limitations of thermal expansibility and adaptability, avoids temperature difference pinch points and realizes safe and efficient recovery of heat energy.

Description

A waste heat boiler and a high-efficiency recovery power generation system using the waste heat boiler

technical field

The invention belongs to the technical field of waste heat boilers, and in particular relates to an efficient recycling and utilization waste heat boiler power generation system.

Background technique

Boilers that use the sensible heat of various waste gases and waste heat after incineration as heat sources are called waste heat boilers, also known as waste heat boilers. In the traditional waste heat boiler power generation system, the main body of the waste heat boiler heats and pressurizes the boiler feed water, and the steam turbine realizes the steam to do work, and completes the thermal power conversion to drive the generator to generate electricity. Common waste heat boilers generally use flue pipes for heat exchange, and the minimum wall temperature of the metal heating surface is roughly in a multiple relationship with the discharge temperature of the hot fluid. In the design of waste heat boiler, how to reasonably divide the temperature section is the basis for rationally arranging the heating surface of the waste heat boiler and maximizing the utilization of waste heat. The state advocates vigorous development of waste heat utilization, energy conservation and emission reduction, which play a positive role in protecting energy and improving the quality of human living environment.

The utility model of bulletin number CN101571280A discloses a waste heat boiler steam power generation system, which comprises a sintering waste heat boiler system (2), a steam matching system (3), a gas superheating boiler system (4) and A turbo-generator system (5). The steam power generation system of this waste heat boiler will pass the high temperature flue gas of the waste heat boiler for recycling, and the saturated steam generated will pass into the gas boiler to form superheated steam, and the superheated steam will pass into the steam turbine for efficient power generation, thus effectively utilizing the flue gas. waste heat, avoid energy waste and reduce production costs.

The utility model of bulletin number CN204943433U discloses a waste heat boiler that utilizes high-temperature flue gas to recover waste heat to generate steam for power generation. It adopts a single-drum horizontal structure, and a membrane-type water-cooling wall system is arranged at the inlet of the flue gas. The membrane-type water-cooling wall system passes through a high-temperature superheater. It is connected with the low temperature superheater and the evaporating tube bundle. The evaporating tube bundle is connected to the flue gas outlet through the high temperature economizer, the medium temperature economizer and the low temperature economizer in turn. The high temperature economizer is connected to the membrane water wall system through the drum. The water cooling wall system includes a front membrane type wall, a rear membrane type wall, a side membrane type wall and a smoke inlet membrane type wall, and a rising pipe is connected between the front membrane type wall and the rear membrane type wall. The utility model has the characteristics of compact structure, high heat recovery efficiency, reliable operation, energy saving and environmental protection, good sealing performance, completely solves the problem of boiler air leakage, greatly improves the boiler steam output, fully recovers the waste heat, reduces the cost of power generation, and improves the economy. The thermal efficiency is over 86%, and it can be used for waste heat recovery and utilization in carbon, glass kiln, coking and other industries.

The utility model of bulletin number CN205578050U relates to a steam power generation system of a waste heat boiler, which is characterized in that it comprises a sintering waste heat boiler system (2), a steam matching system (3), a gas superheating boiler system ( 4) and the steam turbine generator system (5). The steam power generation system of this waste heat boiler will pass the high temperature flue gas of the waste heat boiler for recycling, and the saturated steam generated will pass into the gas boiler to form superheated steam, and the superheated steam will pass into the steam turbine for efficient power generation, thus effectively utilizing the flue gas. waste heat, avoid energy waste and reduce production costs.

The utility model of bulletin number CN208983326U discloses a self-deoxidizing subcritical CDQ waste heat boiler, which includes a furnace, a turning chamber, a water-cooled wall hanging pipe, a deaerator and a high-pressure drum, and the furnace is provided with water supply in order from bottom to top. Heaters, low pressure evaporators, high pressure economizers, high pressure fin tube evaporators, high pressure light tube evaporators, low temperature superheaters, reheaters and high temperature superheaters. After the utility model is adopted, the pressure of the superheated steam at the outlet of the high-temperature superheater can reach 17.4-17.8MPa, the temperature can reach 571±5°C, and the power generation is about 5% higher than that of the existing high-temperature and high-pressure CDQ waste heat boiler with the same amount of flue gas. , saves externally supplied steam and its supporting equipment, greatly reduces the investment and operating costs of the entire project, has a more compact structure and occupies less land.

However, the above technical solutions have unreasonable temperature section division in the design of the preheating boiler; in the design of the entire preheating boiler power generation system, the system layout is unreasonable; thus affecting the safe and efficient recovery of heat energy.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an efficient recycling waste heat boiler power generation system.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A waste heat boiler includes a preheating boiler hearth, a high-temperature flue gas inlet is arranged on the upper part of the preheating boiler hearth, and a superheater, an evaporator and an economizer are sequentially arranged in the preheating boiler hearth from top to bottom; A reheater is arranged in parallel at the upper end of the boiler; the high temperature flue gas enters the furnace of the preheating boiler and exchanges heat with the superheater, reheater, evaporator and economizer respectively;

The boiler feed water is connected to the economizer, collected in the economizer lower header and enters the economizer for heat exchange, the economizer upper header is connected to the steam drum, the boiler feed water enters the economizer for heating, and passes through the economizer upper header from the water inlet pipe Pump into the steam drum; the water outlet of the steam drum is connected to the descending pipe, the water in the steam drum descends in the descending pipe, the descending pipe is connected to the lower header of the evaporator and enters the evaporator for heat exchange, and the upper header of the evaporator is connected to the rising pipe to the steam-water separator; The saturated steam outlet of the steam drum is connected to the lower header of the superheater, and the outlet of the upper header of the superheater is connected to the main steam pipeline.

The high temperature flue gas inlet is connected to the exhaust of the Ender furnace process.

A membrane-type water-cooling wall is arranged at the furnace chamber of the preheating boiler.

A high-efficiency recovery power generation system utilizing a waste heat boiler, comprising the waste heat boiler, and further comprising: a steam turbine, a generator, a condenser, a steam turbine extraction pipeline, a condensate pump, a high-pressure condensate pump, a low-pressure heater, a feed pump, a high-pressure heaters and soft water heaters;

The superheated steam in the main steam pipeline enters the steam turbine to drive the steam turbine to do work, complete the thermal power conversion and drive the generator to generate electricity;

The steam turbine is connected with a steam turbine reheating steam pipeline. The steam turbine reheating steam pipeline extracts the medium and low pressure steam of the steam turbine and sends it to the reheater for heat exchange, and the formed pressure steam is sent back to the corresponding pressure stage of the steam turbine for expansion work;

The steam turbine is connected with a multi-channel steam turbine extraction pipeline, and the multi-channel steam turbine extraction steam pipeline is divided into two channels, which are a pipeline and a pipeline respectively; the steam in the first pipeline and the high-pressure heater exchange heat and collect in the second pipeline; the second pipeline The circuit is connected to the low-pressure heater for heat exchange to form condensed water into the condensed water pipeline;

The condenser is connected to the exhaust steam outlet of the steam turbine, and the condenser condenses the exhaust steam to form condensate water, which enters the condensate water pipeline;

The condensate pipeline is divided into two paths, which are respectively connected to the low-pressure condensate pump and the high-pressure condensate pump; the outlet of the low-pressure condensate pump is sequentially connected to the low-pressure heater, the feed pump and the high-pressure heater, and then connected to the waste heat boiler feed water pipeline after heat exchange; the high-pressure condensate pump increases the condensate pressure. To the boiler feed water pressure, connect the soft water heater to be heated by the exhaust gas of the boiler tail process, and then connect the waste heat boiler feed water pipeline.

It also includes the Ende furnace. The superheated steam in the main steam pipeline is divided into two paths. The main path enters the steam turbine to drive the steam turbine to do work, and the other way leads to the Ende furnace as a gasification agent to participate in the water-gas gasification reaction cycle.

It also includes a pressure vessel. After the exhaust gas at the tail of the boiler is cooled by the soft water heater to reach a predetermined temperature, it is pressurized and stored in the pressure vessel.

The heating surface on the exhaust side of the soft water heater adopts an extended heating surface.

The beneficial effects of the present invention are:

The waste heat boiler of the present invention adopts a vertical structure, and the high-temperature flue gas is transported from the upper end of the waste heat boiler to the lower end to exchange heat with the heat exchange equipment in turn, and a large amount of dust in the exhaust gas is collected at the bottom end in the ash falling device; The air intake method realizes the self-purging characteristics of the heat exchange device of the waste heat boiler, overcomes the serious problem of fouling of the traditional waste heat boiler, and has stronger adaptability and larger application space.

The waste heat boiler of the invention overcomes the inherent defects of the traditional waste heat boiler with serious ash accumulation, serious wear and the limitation of thermal expansion and adaptability, utilizes the flow of flue gas, realizes the function of self-purging, solves the phenomenon of ash on the heating surfaces at all levels, and improves the The heat transfer performance of the heating surface avoids the pinch point of temperature difference and realizes the safe and efficient recovery of heat energy.

The heat exchange method between the high temperature flue gas and the circulating working medium adopts the reverse flow heat exchange method, which enhances the heat exchange efficiency as much as possible while strengthening the heat exchange; controls the low pressure condensate pump and the high pressure condensate pump, and strictly regulates the condensate water flow to make the high pressure and In the low-pressure heater, the temperature drop of the steam extraction steam of the steam turbine and the temperature rise of the condensate water are constant, and the steam extraction of the steam turbine is ensured to form a drain; the heating surface on the exhaust side of the soft water heater process connected with the high-pressure condensate pump adopts an extended heating surface to enhance heat transfer to ensure the Ende furnace. The process exhaust is cooled to a predetermined temperature for easy collection.

Description of drawings

FIG. 1 is a schematic diagram of the system of the present invention.

The reference signs of each component in the figure: 1—waste heat boiler furnace; 2—waste heat boiler feed water pipeline; 3—coal economizer; 4—evaporator; 5—superheater; 6—steam drum; 7—steam-water separator; 8 - reheater; 9 - main steam pipeline; 10 - steam turbine; 11 - generator; 12 - steam turbine reheat steam pipeline; 13 - exhaust steam pipeline; 14 - condenser; 15 - steam turbine extraction steam pipeline; 16 - Ende Furnace generator; 17—low pressure condensate pump; 18—high pressure condensate pump; 19—low pressure heater; 20—feed water pump; 21—high pressure heater; 22—ash outlet; 23—soft water heater; 24—pressure vessel; 25—High temperature flue gas inlet.

Detailed ways

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

Example 1:

As shown in FIG. 1 , this embodiment discloses a waste heat boiler, which includes a preheating boiler hearth 1 , and a membrane-type water wall is arranged at the preheating boiler hearth 1 . The upper part of the furnace chamber 1 of the preheating boiler is provided with a high temperature flue gas inlet 25 . In this embodiment, the high temperature flue gas inlet 25 is connected to the exhaust of the Ender furnace process.

A superheater 5, an evaporator 4 and an economizer 3 are arranged in order from top to bottom in the preheating boiler furnace 1; a reheater 8 is arranged parallel to the superheater 5 and is located at the upper end of the boiler. After the high-temperature flue gas enters the furnace 1 of the preheating boiler, heat exchange occurs with the superheater 5, the reheater 8, the evaporator 4 and the economizer 3, and the saturated steam is heated to become superheated steam (corresponding to the superheater 5), and the reheated steam is heated in turn. Steam is superheated steam (corresponding to reheater 8), heating saturated water is a mixture of soda and water (corresponding to evaporator 4) and heating boiler feed water (corresponding to economizer 3). The circulating working medium flow in the reheater 9, the evaporator 4 and the economizer 3 makes the two heat exchange media have the same heat capacity flow rate.

The boiler feed water is connected to the economizer 3, collected in the lower header of the economizer 3 and enters the economizer 3 for heat exchange, the upper header of the economizer 3 is connected to the steam drum 6, the boiler feed water enters the economizer 3 for heating, and passes through the economizer. 3 The upper header is pumped into the steam drum 6 from the water inlet pipe; the water outlet of the steam drum 6 is connected to the descending pipe, the water in the steam drum 6 descends in the descending pipe, and the descending pipe is connected to the evaporator 4. The lower header enters the evaporator 4 for heat exchange and evaporation The upper header of the boiler 4 is connected to the riser pipe to the steam-water separator 7 in the steam drum 6; the saturated steam outlet of the steam drum 6 is connected to the lower header of the superheater 5, and the outlet of the upper header of the superheater 5 is connected to the main steam pipeline 9.

The process exhaust of the Ende furnace enters the high temperature flue gas inlet 25 at the upper end of the waste heat boiler, and the process exhaust heat is transferred to the circulating working medium through the furnace and the heat exchange device in the furnace. The heat exchange device in the furnace includes: superheater 5, reheater 8, Evaporator 4, economizer 3 and membrane-type water-cooled wall, the process exhaust gas is transported from top to bottom for heat exchange in sequence, and the circulating working medium flow of the heat exchange device in the furnace is matched to form a reverse flow heat exchange mode between the exhaust gas and the circulating working medium , to improve the heat exchange efficiency.

The waste heat boiler of this embodiment overcomes the traditional waste heat boiler's inherent defects of serious ash accumulation, serious wear, and the limitation of thermal expansion and adaptability, and uses the flow of flue gas to achieve the effect of self-purging, and solve the phenomenon of ash on the heating surfaces at all levels, Improve the heat transfer performance of the heating surface, avoid the pinch point of temperature difference, and realize the safe and efficient recovery of heat energy.

Embodiment 2:

As shown in FIG. 1 , this embodiment discloses a high-efficiency recovery and power generation system using a waste heat boiler, including the waste heat boiler described in the first embodiment, and further comprising: a steam turbine 10 , a generator 11 , a condenser 14 , and a steam turbine extraction pipeline 15. Ender furnace generator 16, condensate water pump 17, high pressure condensate water pump 18, low pressure heater 19, feed water pump 20, high pressure heater 21, soft water heater 23 and pressure vessel 24.

The superheated steam in the main steam pipeline 9 is divided into two paths, the main path enters the steam turbine to push the steam turbine 10 to do work, and the thermal power conversion is completed to drive the generator 11 to generate electricity; Reaction recycling.

The steam turbine 10 is connected with a steam turbine reheating steam pipeline 12. The steam turbine reheating steam pipeline 12 extracts the low-pressure steam from the steam turbine and sends it to the reheater 8 for heat exchange.

The steam turbine 10 is connected with a multi-channel steam turbine extraction steam pipeline 15, and the multi-channel steam turbine extraction steam pipeline 15 is divided into two channels, which are respectively a pipeline and a second pipeline; the steam in the first pipeline exchanges heat with the high-pressure heater 21 and collects in the second pipeline. The second pipeline is connected to the low-pressure heater 19 for heat exchange to form condensed water into the condensed water pipeline.

The condenser 14 is connected to the exhausted steam outlet of the steam turbine 10, and the condenser 14 condenses the exhausted steam to form condensed water, which enters the condensed water pipeline.

The condensate pipeline is divided into two paths, which are respectively connected to the low-pressure condensate pump 17 and the high-pressure condensate pump 18; the outlet of the low-pressure condensate pump 17 is sequentially connected to the low-pressure heater 19, the feed pump 20 and the high-pressure heater 21, and then communicates with the waste heat boiler feed water pipeline 2 after heat exchange; The high pressure condensate pump 18 raises the condensate water pressure to the boiler feed water pressure, connects to the soft water heater 23 to be heated by the exhaust gas from the boiler tail process, and then connects to the waste heat boiler feed water pipeline 2 for the next cycle.

After the exhaust gas from the boiler tail process is cooled to a predetermined temperature by heat exchange by the soft water heater 23 , it is pressurized and stored in the pressure vessel 24 .

The working principle of the high-efficiency recovery power generation system utilizing the waste heat boiler in the present embodiment is as follows:

The process exhaust of the Ende furnace enters the high temperature flue gas inlet 25 at the upper end of the waste heat boiler, and the process exhaust heat is transferred to the circulating working medium through the furnace and the heat exchange device in the furnace. The heat exchange device in the furnace includes: superheater 5, reheater 8, Evaporator 4, economizer 3 and membrane-type water-cooled wall, the process exhaust gas is transported from top to bottom for heat exchange in sequence, and the circulating working medium flow of the heat exchange device in the furnace is matched to form a reverse flow heat exchange mode between the exhaust gas and the circulating working medium , to improve the heat exchange efficiency.

The exhaust heat in the furnace of the waste heat boiler heats the boiler feed water. First, the waste heat boiler feed water is connected to the economizer 3 through the boiler feed water pipe 2, and then injected into the steam drum 6 by the feed water pipe. The steam drum 6 is connected to the down pipe to the lower header of the evaporator 4, and the evaporator 4 The water in the tube cluster is heated into a steam-water mixture, and a pressure difference is formed in the lower header, which pushes the steam-water mixture to enter the steam-water separator 7 in the steam drum 6 along the riser. The saturated steam pipe enters the superheater 5 , and the superheated steam generated by further heating through the superheater enters the steam turbine 10 along the main steam pipe 9 .

The superheated steam generated by the superheater is divided into two paths through the main steam pipeline 9. The main path is connected to the steam turbine 10 and sent to the high-pressure cylinder of the steam turbine to do work; Gasification agent for water gas reaction in Ender furnace.

The steam turbine is connected to the steam turbine reheating steam pipeline 12. The steam turbine reheating steam pipeline 12 extracts the low-pressure steam from the steam turbine and sends it to the reheater 8 for heat exchange.

The steam turbine is connected to the multi-channel steam turbine extraction pipeline 15, and the multi-channel steam turbine extraction steam pipeline 12 is connected to the high-pressure heater 21 and the low-pressure heater 19, and the condensed water is heated by partial extraction steam of the steam turbine. The extraction steam pipeline 15 of the multi-channel steam turbine is divided into two channels. Drain and condensate in the condenser collect.

The exhausted steam at the end of the steam turbine is passed into the condenser 14 to exchange heat with the circulating cooling medium to form condensed water; the drains of the high-pressure heater 21 and the low-pressure heater 19 are collected with the condensed water in the condenser, and then divided into two paths, one of which is condensed at low pressure The water pump 17 is sent to the low pressure heater 17 to be heated and deoxygenated by the extraction steam from the low pressure stage of the steam turbine, and then sent to the high pressure heater 21 through the feed water pump 20 to be heated to a higher temperature by the extraction steam from the high pressure stage of the steam turbine, and then enters the boiler Water supply pipeline 2; the other way is directly sent to the soft water heater 23 through the high-pressure condensate pump 18 without steam extraction heating, and is heated by the exhaust heat from the boiler tail process and then enters the boiler water supply pipeline 2 together with the working water of the high-pressure heater. , and then successively pass through the furnace heat exchange devices at all levels to be heated into superheated main steam of high temperature and high pressure.

The exhaust gas from the Ende furnace process enters from the upper end of the waste heat boiler, exchanges heat with the superheater 5, the reheater 8, the evaporator 4 and the economizer 3 in turn, and then discharges at the lower end of the waste heat boiler through the softened water heater 23 to heat the condensed water and After the exhaust gas is cooled to a predetermined temperature, it is stored under pressure in the pressure vessel 24 .

The waste heat boiler adopts a vertical structure, and the exhaust gas of the Ende furnace process is transported from the upper end of the waste heat boiler to the lower end to exchange heat with the heat exchange equipment in turn, and a large amount of dust in the exhaust gas is collected at the bottom end in the ash falling device; the exhaust gas of the Ende furnace process The special transportation method realizes the self-purging characteristics of the heat exchange device of the waste heat boiler, overcomes the serious problem of ash accumulation in the traditional waste heat boiler, and has stronger adaptability and larger application space.

The heat exchange method of exhaust gas and circulating working fluid in the Ende furnace process adopts the reverse flow heat exchange method to enhance the heat exchange efficiency as much as possible while strengthening the heat exchange; control the low-pressure condensate pump 17 and the high-pressure condensate pump 18, and strictly regulate the condensate water The flow rate makes the temperature drop of the steam extraction steam of the steam turbine in the high-pressure heater 21 and the low-pressure heater 19 equal to the temperature rise of the condensate water, and ensures that the steam extraction of the steam turbine forms a drain; The type heating surface strengthens heat transfer to ensure that the exhaust gas of the Ende furnace process is cooled to a predetermined temperature for easy collection.

This embodiment overcomes the inherent defects of serious fouling and wear and the limitation of thermal expansion and adaptability of the traditional waste heat boiler, avoids the pinch point of temperature difference, and realizes safe and efficient recovery of heat energy.

The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced without departing from the Any modification or partial replacement of the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

In the description of the present invention, it should be understood that the terms "front", "rear", upper", "lower", "left", "right", "middle" and "a" indicate the orientation or positional relationship Based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated for a specific orientation, and thus It should not be construed as a limitation on the protection content of the present invention.

Claims (7)

1. The utility model provides a waste heat boiler, includes preheating boiler furnace, its characterized in that: the upper part of the preheating boiler furnace is provided with a high-temperature flue gas inlet, and a superheater, an evaporator and an economizer are sequentially arranged in the preheating boiler furnace from top to bottom; a reheater is arranged in parallel with the superheater and is positioned at the upper end of the boiler; after entering a hearth of a preheating boiler, the high-temperature flue gas respectively exchanges heat with a superheater, a reheater, an evaporator and an economizer;

the boiler water supply is connected with an economizer, collected at a lower header of the economizer and enters the economizer for heat exchange, an upper header of the economizer is connected with a steam pocket, the boiler water supply enters the economizer for heating, and is pumped into the steam pocket from a water inlet pipe through the upper header of the economizer; a steam drum water outlet is connected with a downcomer, water in a steam drum descends on the downcomer, the downcomer is connected with a lower header of an evaporator and enters the evaporator for heat exchange, and an upper header of the evaporator is connected with an ascending pipe to a steam-water separator; the saturated steam outlet of the steam drum is connected with the lower header of the superheater, and the outlet of the upper header of the superheater is communicated with the main steam pipeline.

2. The waste heat boiler as claimed in claim 1, characterized in that: and the high-temperature flue gas inlet is connected with the Ender furnace process exhaust.

3. The waste heat boiler as claimed in claim 1, characterized in that: and a membrane water-cooled wall is arranged at the hearth of the preheating boiler.

4. The utility model provides an utilize exhaust-heat boiler's high-efficient recovery power generation system which characterized in that: comprising a waste heat boiler as claimed in any of claims 1-3, further comprising: the system comprises a steam turbine, a generator, a condenser, a steam turbine steam extraction pipeline, a condensate pump, a high-pressure condensate pump, a low-pressure heater, a water feed pump, a high-pressure heater and a soft water heater;

the superheated steam in the main steam pipeline enters a steam turbine to push the steam turbine to do work, and the heat-work conversion is completed to drive a generator to generate electricity;

the steam turbine is connected with a steam turbine reheating steam pipeline, the steam turbine reheating steam pipeline extracts low-pressure steam in the steam turbine and sends the low-pressure steam to the reheater for heat exchange, and the formed pressure steam is sent back to a corresponding pressure stage of the steam turbine for expansion to do work;

the steam turbine is connected with a plurality of steam turbine steam extraction pipelines which are divided into two paths, namely a pipeline and a second pipeline; the steam in the first pipeline exchanges heat with the high-pressure heater and then is collected in the second pipeline; the two pipelines are connected with the low-pressure heater for heat exchange to form a condensed water gathering pipeline;

the condenser is connected with an exhaust steam outlet of the steam turbine, and the exhaust steam is condensed by the condenser to form condensed water which enters a condensed water pipeline;

the condensed water pipeline is divided into two paths which are respectively connected with a low-pressure condensed water pump and a high-pressure condensed water pump; the outlet of the low-pressure condensate pump is sequentially connected with a low-pressure heater, a water feed pump and a high-pressure heater for heat exchange and then communicated with a water feed pipeline of the waste heat boiler; the high-pressure condensate pump lifts the condensate water pressure to the boiler water supply pressure, is connected with the soft water heater and is heated by the exhaust gas of the boiler tail process, and then is connected with the water supply pipeline of the waste heat boiler.

5. The high efficiency recovery waste heat boiler power generating system of claim 4, wherein: the system also comprises an Ender furnace, superheated steam in a main steam pipeline is divided into two paths, a main path enters a steam turbine to push the steam turbine to do work, and the other path is communicated to the Ender furnace to be used as a gasifying agent to participate in the water gas gasification reaction for cyclic utilization.

6. The high efficiency recovery waste heat boiler power generating system according to claim 4 or 5, characterized in that: the boiler tail process exhaust gas is subjected to heat exchange and cooling through a soft water heater to reach a set temperature, and then is pressurized and stored in the pressure container.

7. The high efficiency recovery waste heat boiler power generating system of claim 6, wherein: the exhaust side heating surface of the soft water heater adopts an expansion type heating surface.

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