Blending combustion supply pipeline system for waste mash thick slurry of circulating fluidized bed boiler

Abstract

The utility model discloses a blending combustion supply pipeline system for waste mash thick slurry of a circulating fluidized bed boiler, which solves the problems that the boiler is easy to coke and a nozzle is easy to carbonize and block when the thick slurry is sprayed into a combustion chamber. Comprising a thick slurry tank (1) and a thick slurry spray gun (10), the thick slurry tank is communicated with a thick slurry supply main pipeline (4), the other end of the thick slurry supply main pipeline is connected with a thick slurry supply branch pipeline (14), and the other end of the thick slurry supply branch pipeline is connected with the thick slurry spray gun; a compressed air communicating pipe (12) and a cooling spray gun primary hot air pipeline (13) are respectively connected to the thick slurry spray gun; a screw pump (2) and a flow meter (3) are respectively arranged on the thick slurry supply main pipeline; a pressure transmitter (6), a diaphragm pressure gauge (7), an electric stop valve (8) and a steam blowing pipeline (11) are respectively arranged on the thick slurry supply branch pipeline; and carbonization and blockage of the spray head are avoided, and waste mash thick slurry burning in the boiler can be fully burnt.

Description

TECHNICAL FIELD

[0001] The utility model relates to a circulating fluidized bed boiler, especially a waste mash thick slurry blending combustion feeding pipeline system of circulating fluidized bed boiler. BACKGROUND

[0002] With the rapid development of biomass energy technology, the process of preparing cellulose fuel ethanol from straw raw materials is increasingly mature; the waste mash slurry after preparing fuel ethanol is a kind of high-concentration organic wastewater, and the organic wastewater has a pungent smell and corrosivity, which can destroy the ecological balance of water body, cause water quality deterioration and pollute the surrounding environment once entering the natural water body; the prior art is to filter the waste mash slurry through a plate frame to obtain lignin residue, and to distill and concentrate the filter liquor into thick slurry; in order to treat the waste mash slurry after preparing fuel ethanol, a circulating fluidized bed boiler using lignin residue as fuel is developed by a boiler production enterprise, and the circulating fluidized bed boiler uses lignin residue as fuel and is assisted by blending combustion of concentrated waste mash slurry to realize combustion treatment of harmful materials; how to design a pipeline system suitable for conveying concentrated waste mash slurry to a circulating fluidized bed boiler becomes a problem to be solved on site. SUMMARY

[0003] The utility model provides a kind of waste mash thick slurry blending combustion feeding pipeline system of circulating fluidized bed boiler, solve how to design a kind of technical problems of pipeline system suitable for conveying concentrated waste mash slurry to circulating fluidized bed boiler.

[0004] The utility model is through following technical scheme solves above technical problem:

[0005] A kind of waste mash thick slurry blending combustion feeding pipeline system of circulating fluidized bed boiler, including thick slurry tank and thick slurry lance, there is thick slurry feeding main pipeline in communication on thick slurry tank, thick slurry feeding branch pipeline is connected in another end of thick slurry feeding main pipeline, thick slurry lance is connected in another end of thick slurry feeding branch pipeline;Compressed air communication pipe and cooling lance primary hot air pipeline are connected on thick slurry lance respectively;Screw pump and flowmeter are respectively arranged on thick slurry feeding main pipeline;Pressure transmitter, diaphragm pressure gauge, electric stop valve and steam purging pipeline are respectively arranged on thick slurry feeding branch pipeline.

[0006] Cooling lance primary hot air pipeline is communicated together with thick slurry lance by metal hose;Thick slurry lance is horizontally inserted into circulating fluidized bed boiler, and waste mash thick slurry conveyed from thick slurry tank is in fan-shaped atomization state after passing through thick slurry lance and enters into circulating fluidized bed boiler.

[0007] Two of the four thick slurry supply sub-pipes are connected to the outlet of the thick slurry supply main pipe through a first stop valve, and the other two thick slurry supply sub-pipes are connected to the outlet of the thick slurry supply main pipe through a second stop valve.

[0008] The concentration of the waste slurry liquid in the thick slurry tank is 40%-50%; the thick slurry tank is provided with a stirrer, and a steam coil heat exchanger is arranged at the bottom of the thick slurry tank; the temperature of the steam in the steam purging pipe is 120 DEG C, and the pressure of the steam is 0.8 MPa; the temperature of the compressed air in the compressed air communication pipe is 75 DEG C, and the pressure of the compressed air is 0.7 MPa.

[0009] The pipeline structure is designed according to the characteristics of the waste slurry liquid, the waste slurry liquid is sprayed into the circulating fluidized bed boiler through compressed air, the flow rate and speed of the waste slurry liquid sprayed into the circulating fluidized bed boiler are effectively controlled through the screw pump, and the hot air in the primary hot air pipeline is introduced into the spray head, so that the spray head is prevented from being carbonized and blocked, and the waste slurry liquid mixed and burned in the boiler can be fully burned. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 The pipeline structure is designed according to the characteristics of the waste slurry liquid, the waste slurry liquid is sprayed into the circulating fluidized bed boiler through compressed air, the flow rate and speed of the waste slurry liquid sprayed into the circulating fluidized bed boiler are effectively controlled through the screw pump, and the hot air in the primary hot air pipeline is introduced into the spray head, so that the spray head is prevented from being carbonized and blocked, and the waste slurry liquid mixed and burned in the boiler can be fully burned. DETAILED DESCRIPTION

[0011] The pipeline structure is designed according to the characteristics of the waste slurry liquid, the waste slurry liquid is sprayed into the circulating fluidized bed boiler through compressed air, the flow rate and speed of the waste slurry liquid sprayed into the circulating fluidized bed boiler are effectively controlled through the screw pump, and the hot air in the primary hot air pipeline is introduced into the spray head, so that the spray head is prevented from being carbonized and blocked, and the waste slurry liquid mixed and burned in the boiler can be fully burned.

[0012] A waste slurry liquid mixing and burning supply pipeline system of a circulating fluidized bed boiler, comprising a thick slurry tank 1 and a thick slurry lance 10, a thick slurry supply main pipe 4 is communicated with the thick slurry tank 1, thick slurry supply sub-pipes 14 are connected to the other end of the thick slurry supply main pipe 4, and the thick slurry lance 10 is connected to the other end of the thick slurry supply sub-pipes 14; a compressed air communication pipe 12 and a cooling lance primary hot air pipeline 13 are respectively connected to the thick slurry lance 10; a screw pump 2 and a flow meter 3 are respectively arranged on the thick slurry supply main pipe 4; a pressure transmitter 6, a diaphragm pressure gauge 7, an electric stop valve 8 and a steam purging pipe 11 are respectively arranged on the thick slurry supply sub-pipes 14; the flow meter 3 monitors the flow rate of the thick slurry into the furnace in real time, so that the thick slurry does not exceed the rated flow rate in the combustion process, and the coking of the boiler is prevented; the thick slurry liquid is given sufficient flow rate and pressure by the screw pump 2 to the spray head of the lance, the spray head is provided with a compressed air atomizing pipeline, so that the thick slurry cannot be carbonized and blocked in the high-temperature combustion process in the dense phase zone; the spray head of the thick slurry lance 10 is a rectangular flat mouth, which is inserted into the furnace from the secondary air port of the boiler and requires horizontal insertion, the compressed air is atomized and scattered into the material in the form of a fan, and after entering the furnace, the atomized state is disturbed by the high-temperature flue gas and burns.

[0013] The cooling spray gun once hot air pipeline 13 is communicated with the thick slurry spray gun 10 through the metal hose 9; the thick slurry spray gun 10 is horizontally inserted into the circulating fluidized bed boiler, and the waste mash thick slurry liquid delivered from the thick slurry tank 1 is in a fan-shaped atomization state after passing through the thick slurry spray gun 10 and enters the circulating fluidized bed boiler.

[0014] Four thick slurry supply branch pipelines 14 are connected in parallel at the outlet of the thick slurry supply main pipeline 4, two of which are connected in parallel first and then communicated with the outlet of the thick slurry supply main pipeline 4 through the first stop valve 15, and the other two are connected in parallel first and then communicated with the outlet of the thick slurry supply main pipeline 4 through the second stop valve 5; two thick slurry supply branch pipelines 14 are put into operation during normal full load operation, and the other two are standby.

[0015] The concentration of the waste mash thick slurry liquid in the thick slurry tank 1 is 40%-50%; the thick slurry tank 1 is provided with a stirrer, and a steam coil heat exchanger is arranged at the bottom of the thick slurry tank 1; the temperature of the steam in the steam purging pipeline 11 is 120℃, and the pressure of the steam is 0.8MPa; the temperature of the compressed air in the compressed air communication pipeline 12 is 75℃, and the pressure of the compressed air is 0.7MPa; the waste mash thick slurry liquid has high viscosity and poor flowability, and is easy to harden and block; the steam purging pipeline 11 and the compressed air communication pipeline 12 provided in the system are cleaned and purged to ensure that the pipelines are not easy to harden and block.

[0016] When the furnace temperature of the boiler is greater than 600℃, the waste mash thick slurry liquid is started to be delivered, then the amount value is gradually increased, and the ratio of the waste mash thick slurry liquid to the lignin residue delivered to the boiler is 1:3, starting from one thick slurry spray gun 10 to two thick slurry spray guns 10; when the load decreases, the slurry mixed and burned in the boiler is gradually reduced, and when the flow of the mixed and burned slurry is reduced to 2000kg / h, one thick slurry spray gun 10 is cut off, leaving one thick slurry spray gun 10 for mixing and burning, and the cut-off gun needs to be cleaned and purged to prevent end carbonization; the slurry is started to be delivered according to more than 60% load in the early stage, and the lower limit is gradually explored after stable operation; the spray gun and the pipeline need to be purged in time after each shutdown to prevent thick slurry solidification and blockage of the pipeline.

Claims

1. A system for feeding a waste thickened slurry of a circulating fluidized bed boiler, comprising a thickened slurry tank (1) and a thickened slurry lance (10), characterized in that A thick slurry tank (1) is communicated with a thick slurry supply main pipeline (4), the other end of the thick slurry supply main pipeline (4) is connected with a thick slurry supply branch pipeline (14), the other end of the thick slurry supply branch pipeline (14) is connected with a thick slurry spray gun (10); the thick slurry spray gun (10) is respectively connected with a compressed air communication pipe (12) and a cooling spray gun primary hot air pipeline (13); the thick slurry supply main pipeline (4) is respectively provided with a screw pump (2) and a flow meter (3); the thick slurry supply branch pipeline (14) is respectively provided with a pressure transmitter (6), a diaphragm pressure gauge (7), an electric stop valve (8) and a steam blowing pipeline (11).

2. A system for feeding a mixture of concentrated spent liquor and fuel to a circulating fluidized bed boiler according to claim 1, characterized in that Four thick slurry supply branch pipelines (14) are connected in parallel at the outlet of the thick slurry supply main pipeline (4), two of the thick slurry supply branch pipelines (14) are connected in parallel first and then communicated together with the outlet of the thick slurry supply main pipeline (4) through a first stop valve (15), and the other two thick slurry supply branch pipelines (14) are connected in parallel first and then communicated together with the outlet of the thick slurry supply main pipeline (4) through a second stop valve (5).

3. A system for feeding a mixture of concentrated spent liquor and fuel to a circulating fluidized bed boiler according to claim 2, characterized in that The concentration of the waste slurry liquid in the thick slurry tank (1) is 40%-50%; the thick slurry tank (1) is provided with an agitator, and a steam coil heat exchanger is arranged at the bottom of the thick slurry tank (1); the temperature of the steam in the steam blowing pipeline (11) is 120℃, and the pressure of the steam is 0.8MPa; the temperature of the compressed air in the compressed air communication pipe (12) is 75℃, and the pressure of the compressed air is 0.7MPa.

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