Heat supply system of solid waste furnace

Abstract

The utility model discloses a heat supply system of a solid waste boiler, which comprises a solid waste mixing bin, a solid waste boiler and a dust removal mechanism which are sequentially connected, the solid waste boiler is connected with a main steam pipeline, the main steam pipeline is used for outputting high-temperature and high-pressure airflow, and a combustion chamber, a rotary separator, a return feeder, an external bed and an economizer are arranged in the solid waste boiler. The top of the combustion chamber is communicated with the rotary separator, the bottom of the rotary separator is connected with the return feeder, the return feeder is further connected with the external bed, the external bed is communicated with the bottom of the combustion chamber, and the top of the rotary separator is communicated with the economizer. The solid waste mixing bin and the solid waste boiler are arranged, waste is combusted to provide energy, the waste is fully combusted through the material returning device and the external bed, heat flows back to the solid waste boiler through the coal economizer, and low-consumption and high-efficiency combustion is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heating systems, in particular to a heating system for a solid waste furnace. Background Art

[0002] The high-temperature and high-pressure steam generated by conventional coal-fired boilers is reduced in pressure and temperature through a temperature and pressure reducer, and then output to a steam turbine generator for power generation. During this process, there is serious energy loss, resulting in problems such as rising energy costs.

[0003] The paper machine requires the heating pipe to adjust the pressure of 15KG or 10KG to supply heat to the paper machine, but the existing heating pipe pressure is very unstable, which affects the production process of the paper machine. Utility Model Content

[0004] The purpose of the utility model is to provide a heating system for a solid waste furnace, which solves the problems in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a heating system for a solid waste furnace, comprising a solid waste mixing bin, a solid waste boiler and a dust removal mechanism connected in sequence, the solid waste boiler is connected to a main steam pipe, the main steam pipe is used to output a high-temperature and high-pressure airflow, the solid waste boiler is provided with a combustion chamber, a rotary separator, a returner, an external bed and an economizer, the top of the combustion chamber is connected to the rotary separator, the bottom of the rotary separator is connected to the returner, the returner is also connected to the external bed, and the external bed is connected to the bottom of the combustion chamber, and the top of the rotary separator is connected to the economizer.

[0006] Preferably, a water-cooled wall pipe extends outward from the economizer, and the water-cooled wall pipe is interconnected with the rotary separator.

[0007] Preferably, the main steam pipeline is connected with a first branch and a second branch, and the first branch is connected with the second branch in parallel, wherein the first branch is connected with a gas turbine generator, and a temperature and pressure reducer is arranged on the second branch.

[0008] Preferably, the temperature and pressure reducing device comprises an electric regulating valve and two regulating drain valves connected by a pipeline, and a temperature reducing pipeline is externally connected to the pipeline.

[0009] Preferably, the dust removal mechanism includes an electrostatic precipitator, a dry tower, a first-level bag, a second-level bag, an induced draft fan and a smoke exhaust chimney connected in sequence, and the dust removal mechanism also includes an ash bin, which is respectively connected to the bottom of the electrostatic precipitator, the bottom of the first-level bag and the bottom of the second-level bag.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0011] The utility model provides a solid waste mixing bin and a solid waste boiler to burn papermaking solid waste to provide high-temperature and high-pressure steam energy, and fully burns the waste through a return device and an external bed, and returns heat to the solid waste boiler by providing an economizer, thereby achieving low-consumption and high-efficiency coal-free combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is a structural schematic diagram of the temperature and pressure reducing device of the utility model. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] See also Figure 1 to Figure 2 The utility model provides an embodiment: a heating system for a solid waste furnace, comprising a solid waste mixing bin 10, a solid waste boiler 20 and a dust removal mechanism 30 connected in sequence. The solid waste mixing bin 10 can mix the sludge and paper residue produced by papermaking, and then crush, remove iron, and screen them before transmitting them to the solid waste boiler 20. The solid waste boiler 20 is connected to a main steam pipeline 21. The solid waste boiler 20 produces high-temperature and high-pressure steam by burning feed water, and outputs high-temperature and high-pressure steam through the main steam pipeline 21. The solid waste boiler 20 is provided with a combustion chamber 22, a rotary separator 23, a return device 24, and an external bed 2 5 and economizer 26. The top of the combustion chamber 22 is connected with the rotary separator 23. When the combustion chamber 22 is burning, the incompletely burned materials follow the smoke flow into the rotary separator 23. The rotary separator 23 separates the smoke and the incompletely burned materials. The smoke enters the economizer 26. The incompletely burned materials enter the return device 24 along the bottom of the rotary separator 23. The return device 24 returns the relatively large materials to the combustion chamber 22 for secondary combustion. Some of the smaller materials are transmitted to the external bed 25 through the return device 24, and the external bed 25 is connected with the bottom of the combustion chamber 22.

[0016] The external bed 25 is the abbreviation of the external fluidized bed heat exchanger, which is a heat exchanger mainly arranged on the ash circulation loop of the circulating fluidized bed boiler. The function of the external bed 25 is to transfer part of the heat carried by the circulating ash to one or more groups of heating surfaces, and also has the function of circulating ash return. It usually consists of an ash distribution chamber and one or more bed chambers arranged with buried heating surface pipes. These pipe bundles can be superheaters, reheaters or evaporation heating surfaces according to the temperature of the ash. The external bed 25 transfers part of the heat of the ash back to the combustion chamber 22, and returns the ash to the combustion chamber 22 to maximize the utilization of thermal energy and consumables.

[0017] A water-cooled wall pipe 27 extends outward from the economizer 26, and the water-cooled wall pipe 27 is interconnected with the rotary separator 23. The high-temperature flue gas diverted by the rotary separator 23 passes through the water-cooled wall pipe 27 and the economizer 26 in turn. The walls of the economizer 26 and the water-cooled wall pipe 27 are both hollow structures. The feed water first enters the hollow structure and absorbs the heat of the high-temperature flue gas to cool the flue gas. At the same time, the feed water flows back to the solid waste boiler 20 for combustion. After absorbing the heat, the feed water can reduce the combustion energy consumption of the solid waste boiler 20, thereby achieving energy-saving effects.

[0018] The water-cooled wall pipe 27 is provided to increase the contact area and further improve the heat absorption effect.

[0019] The main steam pipe 21 is connected to a first branch 28 and a second branch 29, and the first branch 28 is connected in parallel with the second branch 29, wherein the first branch 28 transmits high-temperature and high-pressure steam to the gas turbine generator 40 for use by the gas turbine engine 40 and converted into electrical energy, and a temperature and pressure reducer 50 is provided on the second branch 29.

[0020] The temperature reducer and pressure reducer 50 includes an electric regulating valve 51 and two regulating drain valves 52 connected by pipelines. The drain valve 52 is adjusted to discharge and reduce pressure, and the temperature is reduced by a temperature reduction pipeline 53 externally connected to the pipeline. The temperature reduction pipeline 53 inputs cooling water into the pipeline to achieve water cooling, and the output pressure of the second branch 29 is controlled in real time by the electric regulating valve 51.

[0021] The temperature and pressure reducer 50 has strong flexibility in regulating the heating pressure, and can provide both 10KG and 15KG of heating, meeting the steam pressure requirements for papermaking.

[0022] The dust removal mechanism 30 includes an electrostatic precipitator 31, a dry tower 32, a primary bag 33, a secondary bag 34, an induced draft fan 35 and a smoke exhaust chimney 36 which are connected in sequence. The induced draft fan 35 drives the smoke flow to sequentially enter the electrostatic precipitator 31, the dry tower 32, the primary bag 33, the secondary bag 34 for multiple dust removals, and finally the gas is discharged through the smoke exhaust chimney 36.

[0023] The dust removal mechanism 30 also includes an ash bin 37. In the present embodiment, two ash bins 37 are provided, wherein one ash bin 37 is connected to the bottom of the electrostatic precipitator and the bottom of the first-level bag, respectively, and the other ash bin 37 is connected to the bottom of the second-level bag. The ash bin 37 is mainly used to collect the ash removed by dust removal to prevent the ash from flying away along the air flow and to facilitate subsequent cleaning.

[0024] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A heating system for a solid waste furnace, comprising a solid waste mixing bin, a solid waste boiler and a dust removal mechanism connected in sequence, characterized in that: The solid waste boiler is connected to the main steam pipeline, which is used to output high-temperature and high-pressure airflow. The solid waste boiler is provided with a combustion chamber, a rotary separator, a return feeder, an external bed and an economizer. The top of the combustion chamber is connected to the rotary separator, the bottom of the rotary separator is connected to the return feeder, the return feeder is also connected to the external bed, and the external bed is connected to the bottom of the combustion chamber, and the top of the rotary separator is connected to the economizer.

2. A heating system for a solid waste furnace according to claim 1, characterized in that: A water-cooled wall pipe extends outward from the economizer, and the water-cooled wall pipe is communicated with the rotary separator.

3. A heating system for a solid waste furnace according to claim 1, characterized in that: The main steam pipeline is connected with a first branch and a second branch, and the first branch is connected with the second branch in parallel, wherein the first branch is connected with a gas turbine generator, and a temperature and pressure reducer is arranged on the second branch.

4. A heating system for a solid waste furnace according to claim 3, characterized in that: The temperature and pressure reducer comprises an electric regulating valve and two regulating drain valves connected by pipelines, and a temperature reducing pipeline is externally connected to the pipeline.

5. The solid waste furnace heating system according to claim 1, characterized in that: The dust removal mechanism includes an electrostatic precipitator, a dry tower, a primary bag, a secondary bag, an induced draft fan and a smoke exhaust pipe connected in sequence. The dust removal mechanism also includes an ash bin, which is respectively connected to the bottom of the electrostatic precipitator, the bottom of the primary bag and the bottom of the secondary bag.

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