Solid waste melting furnace waste heat boiler power generation system

Abstract

The utility model relates to the field of solid waste resource recycling, and provides a solid waste melting furnace waste heat boiler power generation system. Comprising a steam turbine and a generator, a gas-liquid separator is installed on a pipeline connecting an air inlet of the steam turbine and a waste heat boiler, the output end of the gas-liquid separator is connected with the air inlet of the steam turbine and a pressure equalizing box through branch pipelines, and an exhaust port of the steam turbine is connected with the top of a condenser through a pipeline; the pressure equalizing box is connected with air sealing devices at the two ends of a steam turbine rotating shaft through pipelines. The pressure equalizing box forms air sealing for the air sealing devices at the two ends of the steam turbine and is used for balancing the pressure of the air inlet end and the air outlet end of the steam turbine, and the power generation efficiency of the steam turbine is improved. And after redundant steam in the steam turbine is condensed through the condenser, condensed water is fed into the waste heat boiler for cyclic utilization.

Description

Technical Field

[0001] The utility model relates to the field of solid waste resource recovery and utilization, in particular to a power generation system of a waste heat boiler for a solid waste melting furnace. Background Art

[0002] Common methods for solid waste treatment are incineration or melting, and a large amount of heat will be generated during the treatment process. In order to cool and protect equipment such as the furnace body and hopper and prevent the steel plate of the equipment from burning through, a cooling jacket is generally adopted to cool the equipment. Circulating cooling water is introduced into the cooling jacket to recover and utilize the heat. At the same time, a waste heat boiler is set up to recover the heat. The waste heat boiler can convert the heat generated by combustion into steam for use in the workshop. When the steam is in surplus, the steam of the waste heat boiler can be further recovered and utilized by means of power generation.

[0003] The steam of the waste heat boiler is generally converted into electric energy by driving a steam turbine to do work. During the waste heat power generation process, the steam does work and condenses into water. In order to ensure the power generation efficiency, it is necessary to ensure the balance of the internal pressure difference of the steam turbine. At the same time, condensate will also be generated at the gas seals on both sides of the steam turbine, which needs to be effectively removed in time. The remaining steam and condensate during the steam power generation process need to be treated and recycled to avoid waste. Summary of the Invention

[0004] In order to effectively recover the heat during the solid waste melting process and reduce energy consumption, the utility model provides a power generation system of a waste heat boiler for a solid waste melting furnace.

[0005] The technical solution adopted by the utility model is as follows:

[0006] Waste solid melting furnace waste heat boiler power generation system, including a steam turbine and a generator, the intake of the steam turbine is connected to the steam outlet of the waste heat boiler, the steam turbine drives the generator, and an air-liquid separator and a control valve are installed on the pipeline connecting the intake of the steam turbine and the waste heat boiler. The output end of the air-liquid separator is respectively connected to the intake of the steam turbine and the pressure equalizing box through branch pipelines. The exhaust port of the steam turbine is connected to the top of the condenser through a pipeline; the pressure equalizing box is respectively connected to the air seals at both ends of the steam turbine shaft through pipelines; a coil is installed in the condenser, and the coil is connected with a condensate input pipeline and a condensate output pipeline. The condensate input pipeline is connected in parallel with a generator air cooler and an oil cooler through pipelines. The generator air cooler is connected to the generator, and the oil cooler is connected to the bearing lubrication systems of the steam turbine and the generator; a condensate outlet pipe is provided at the bottom of the condenser, and the condensate outlet pipe is connected to the water tank of the waste heat boiler through a condensate pump and a boiler pipeline; the top of the condenser is connected with a vacuum device, and the vacuum device includes a water tank, a water jet air ejector and a water jet pump. The water jet air ejector and the water jet pump form a closed loop with the water tank through pipelines, and the water jet air ejector is connected to the top of the condenser cavity through a pipeline.

[0007] Further, the air seal device is connected with a drain pipeline, and the branch pipelines on the drain pipeline and the condensate outlet pipe are respectively connected to two heat exchange channels of the air seal heat exchanger. The water after heat exchange in the two heat exchange channels enters the water tank of the waste heat boiler through the boiler pipeline.

[0008] Further, an exhaust port is provided in the heat exchange channel corresponding to the drain pipeline in the air seal heat exchanger, and the exhaust port is connected with an exhaust fan through a pipeline.

[0009] Further, the steam turbine is provided with a plurality of drain ports, and each drain port is connected with a drain expansion tank through a pipeline. The top of the drain expansion tank is connected to the top of the condenser through a gas pipeline, and the bottom of the drain expansion tank is connected to the condenser through a water pipe.

[0010] Further, the bottom of the air-liquid separator is connected to the condenser through a pipeline and a valve.

[0011] Further, the pressure equalizing box is provided with a branch connecting the condenser.

[0012] Still further, the boiler pipeline is connected with a water replenishing device, and the water replenishing device includes a drain tank and a drain pump.

[0013] After adopting the above technical solutions, the beneficial effects of the present utility model are as follows:

[0014] The equalizing chamber is provided to form a gas seal for the gas seal devices at both ends of the steam turbine, and is used to balance the pressures at the inlet end and the exhaust end of the steam turbine, thereby improving the power generation efficiency of the steam turbine. For the excess steam in the steam turbine, after being condensed by the condenser, the condensate is sent to the waste heat boiler for recycling; the condensate generated inside the steam turbine and in the gas seal section is also collected, heat-exchanged through condensation, and then sent to the waste heat boiler for recycling; a negative pressure is formed in the condenser by the vacuum device to ensure the low pressure at the exhaust end of the steam turbine and improve the operating efficiency of the steam turbine. This technical solution can convert the steam of the waste heat boiler into electrical energy for utilization, fully recover the water generated by the steam, and recycle it to achieve the purpose of reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the present utility model.

[0016] In the figure: steam turbine 1, generator 2, gas-liquid separator 3, equalizing chamber 4, condenser 5, generator air cooler 6, oil cooler 7, vacuum device 8, drain expansion tank 9, make-up water device 10, gas seal heat exchanger 11, condensate pump 12, boiler pipeline 13, gas seal device 14, condensate outlet pipe 15, exhaust fan 16. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following further details the specific embodiments of the present utility model with reference to the accompanying drawings:

[0018] As Figure 1 shown, the waste heat boiler power generation system for solid waste melting furnace includes a steam turbine 1, a generator 2, a gas-liquid separator 3, an equalizing chamber 4, a condenser 5, a generator air cooler 6, an oil cooler 7, a vacuum device 8, a drain expansion tank 9, a make-up water device 10, a gas seal heat exchanger 11, and related pipelines and valves, and is used for the steam power generation of the waste heat boiler and the recovery of condensate.

[0019] The steam in the waste heat boiler enters the gas-liquid separator 3 through the control of pipelines and valves. The steam separated in the gas-liquid separator 3 is divided into two branches and enters the inlet of the steam turbine and the equalizing chamber respectively. The condensate separated in the gas-liquid separator enters the condenser 5 or the gas seal heat exchanger 11 through pipelines. The equalizing chamber 4 is connected to the gas seal devices 14 at both ends of the steam turbine shaft through pipelines, as well as the inlet end and the exhaust end inside the steam turbine 1. The equalizing chamber also has a branch connected to the condenser 5. In the initial stage of the operation of the steam turbine 1, the steam provided by the equalizing chamber 4 forms a gas seal for the steam turbine. The condensate formed during the gas seal process enters the gas seal heat exchanger 11 through the drainage pipeline for heat exchange; during the operation stage of the steam turbine 1, the steam inside the equalizing chamber is used to balance the pressure difference between the inlet and exhaust ends of the steam turbine 1, thereby improving the operating efficiency of the steam turbine 1. The steam turbine 1 outputs under the drive of the steam and drives the generator 2 to generate electricity, realizing the steam power generation of the waste heat boiler.

[0020] After the steam in the steam turbine 1 does work, part of it condenses into water, and part of the steam is discharged from the exhaust end. The discharged steam directly enters the condenser 5 for cooling and liquefaction. Coils are installed in the condenser 5, and the coils are connected with a condensate input pipeline and a condensate output pipeline. The condensate input pipeline is connected in parallel through a pipeline with the generator air cooler 6 and the oil cooler 7. The generator air cooler 6 is used for the air-cooling of the generator, and the oil cooler 7 is used for the cooling of the bearing lubricating oil of the steam turbine 1 and the generator 2. A condensate outlet pipe 15 is provided at the bottom of the condenser 5, and the condensate is sent into the water tank of the waste heat boiler for recycling through the condensate pump 12 and the boiler pipeline 13.

[0021] Multiple drain ports are provided on the steam turbine 1, and the condensate enters the drain expansion tank 9 through the pipeline from the drain ports. The drain expansion tank 9 collects the condensate and a small amount of steam. The steam enters the condenser from the top of the drain expansion tank 9, and the condensate enters the condenser from the bottom of the drain expansion tank 9.

[0022] The top of the condenser 5 is connected with a vacuum device 8. The vacuum device consists of a water tank, a water jet air ejector and a water jet pump. The water jet air ejector and the water jet pump form a closed loop with the water tank through the pipeline, and the water jet air ejector is connected to the top of the condenser cavity through the pipeline. The water jet air ejector is used to form a low pressure in the condenser 5 to reduce the pressure at the exhaust end of the steam turbine 1, facilitating the entry of steam into the condenser for cooling and liquefaction.

[0023] The steam seal heat exchanger 11 is arranged in parallel on the boiler pipeline 13 and is provided with two heat exchange channels. One of the heat exchange channels is connected to the drain pipeline of the steam seal device 14, and the other channel is connected to the branch pipeline on the condensate outlet pipe 15. After the condensate in the condenser 5 cools the condensate in the steam seal device 14, it enters the boiler pipeline and is sent to the water tank of the waste heat boiler through the condensate pump 12. An exhaust port is provided in the heat exchange channel corresponding to the drain pipeline in the steam seal heat exchanger 11, and the exhaust port is connected with an exhaust fan 16 through the pipeline. The non-condensable gas contained in the condensate of the steam seal device 14 is discharged to the atmosphere through the exhaust fan 16.

[0024] A water replenishing device 10 is also connected to the boiler pipeline 13. The water replenishing device includes a drain water tank and a drain water pump. When the circulating water is lost, water is pumped from the drain water tank by the drain water pump to supplement the waste heat boiler.

Claims

1. A waste heat boiler power generation system for a solid waste melting furnace, comprising a steam turbine and a generator, wherein the air inlet of the steam turbine is connected to the steam outlet of the waste heat boiler, and the steam turbine drives the generator, characterized in that: A gas-liquid separator and a control valve are installed on the pipeline connecting the air inlet of the steam turbine and the waste heat boiler. The output end of the gas-liquid separator is connected to the air inlet of the steam turbine and the pressure equalizing box through a branch pipeline, and the exhaust port of the steam turbine is connected to the top of the condenser through a pipeline; the pressure equalizing box is connected to the gas sealing devices at both ends of the turbine shaft through a pipeline; a coil is installed in the condenser, and the coil is connected to a condensate input pipeline and a condensate output pipeline. The condensate input pipeline is connected in parallel with a generator air cooler through a pipeline. and an oil cooler, the generator air cooler is connected to the generator, the oil cooler is connected to the bearing lubrication system of the turbine and the generator; a condensate outlet pipe is provided at the bottom of the condenser, and the condensate outlet pipe is connected to the water tank of the waste heat boiler through a condensate pump and a boiler pipeline; a vacuum device is connected to the top of the condenser, and the vacuum device includes a water tank, a water jet vacuum pump and a water jet pump, the water jet vacuum pump and the water jet pump form a closed loop with the water tank through a pipeline, and the water jet vacuum pump is connected to the top of the condenser cavity through a pipeline.

2. The solid waste melting furnace waste heat boiler power generation system according to claim 1, characterized in that: The air sealing device is connected to a drainage pipe, and the drainage pipe and the branch pipe on the condensate outlet pipe are respectively connected to two heat exchange channels of the air sealing heat exchanger. The water after heat exchange in the two heat exchange channels enters the water tank of the waste heat boiler through the boiler pipe.

3. The solid waste melting furnace waste heat boiler power generation system according to claim 2, characterized in that: An exhaust port is provided in the heat exchange channel in the air-sealed heat exchanger corresponding to the drainage pipe, and the exhaust port is connected to an exhaust fan via a pipe.

4. The solid waste melting furnace waste heat boiler power generation system according to claim 1, characterized in that: The steam turbine is provided with a plurality of drain ports, each of which is connected to a drain expansion tank via a pipeline. The top of the drain expansion tank is connected to the top of the condenser via a gas pipeline, and the bottom of the drain expansion tank is connected to the condenser via a water pipe.

5. The solid waste melting furnace waste heat boiler power generation system according to claim 1, characterized in that: The bottom of the gas-liquid separator is connected to the condenser through a pipeline and a valve.

6. The solid waste melting furnace waste heat boiler power generation system according to claim 1, characterized in that: The pressure equalizing tank is provided with a branch line connected to the condenser.

7. The solid waste melting furnace waste heat boiler power generation system according to claim 1, characterized in that: The boiler pipeline is connected with a water replenishing device, and the water replenishing device includes a drain tank and a drain pump.

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