Entrained flow coal gasification black ash water sedimentation and dispersion system and black ash water sedimentation method thereof
阅读说明：本技术 一种气流床煤气化黑灰水沉降、分散系统及其黑灰水沉降方法 (Entrained flow coal gasification black ash water sedimentation and dispersion system and black ash water sedimentation method thereof ) 是由 邓金泉 郝占全 陈慧刚 裴剑 王福强 吉烘樟 赵媛媛 于 2019-09-09 设计创作，主要内容包括：本发明属气流床煤气化技术领域,为提高气流床煤气化黑水沉降效能,提供了一种气流床煤气化黑灰水沉降、分散系统及其黑灰水沉降方法。一级絮凝剂添加装置为絮凝罐I通过絮凝泵I与混合器I相连接；所述二级絮凝剂添加装置为絮凝罐II通过絮凝泵II与混合器II相连接；所述混合器I与混合器II与沉降槽黑水管线相连接,沉降槽底部连接排水泵,沉降槽顶部通过溢流堰与折流澄清器进水口连接；所述折流澄清器底部设置排污口,顶部设置排水管,排水管端部连接灰水槽；所述折流澄清器与灰水槽之间通过分散剂泵连接分散剂罐。在两级装置中添加不同种类的絮凝剂,一方面可以达到降低总药剂用量的目的,另一方面可以对黑水有更好的沉降处理效果。(The invention belongs to the technical field of entrained flow coal gasification, and provides an entrained flow coal gasification black ash water sedimentation and dispersion system and a black ash water sedimentation method thereof for improving sedimentation efficiency of entrained flow coal gasification black water. The primary flocculant adding device is characterized in that a flocculation tank I is connected with a mixer I through a flocculation pump I; the secondary flocculant adding device is characterized in that a flocculation tank II is connected with a mixer II through a flocculation pump II; the mixer I and the mixer II are connected with a black water pipeline of the settling tank, the bottom of the settling tank is connected with a drainage pump, and the top of the settling tank is connected with a water inlet of the baffling clarifier through an overflow weir; the bottom of the baffling clarifier is provided with a sewage discharge outlet, the top of the baffling clarifier is provided with a drain pipe, and the end part of the drain pipe is connected with an ash water tank; and the baffled clarifier is connected with the grey water tank through a dispersant pump. Different kinds of flocculating agents are added into the two-stage device, so that the purpose of reducing the total dosage of the medicine can be achieved, and the black water can be better settled.)
1. The utility model provides an entrained flow coal gasification black grey water subsides, disperse system, includes that set gradually the outer one-level flocculating agent of gasifier outlet adds device, second grade flocculating agent and adds device, subsider (7), baffling clarifier (8), dispersant and add device and grey water groove (9) and constitute its characterized in that: the primary flocculant adding device is characterized in that a flocculation tank I (1) is connected with a mixer I (3) through a flocculation pump I (2); the secondary flocculant adding device is characterized in that a flocculation tank II (4) is connected with a mixer II (6) through a flocculation pump II (5); the mixer I (3) and the mixer II (6) are connected with a black water pipeline of the settling tank (7), the bottom of the settling tank (7) is connected with a drainage pump, and the top of the settling tank (7) is connected with a water inlet of the baffling clarifier (8) through an overflow weir; a sewage discharge outlet is arranged at the bottom of the baffling clarifier (8), a drain pipe is arranged at the top of the baffling clarifier, and the end part of the drain pipe is connected with an ash water tank (9); the baffling clarifier (8) is connected with the grey water tank (9) through a dispersant pump (11) to form a dispersant tank (10).
2. The entrained flow coal gasification black ash water sedimentation and dispersion system according to claim 1, wherein: and the bottom of the settling tank is connected with a filtering device.
3. The entrained flow coal gasification black ash water sedimentation and dispersion system according to claim 2, wherein: the filtering device is a band removing filter.
4. The entrained flow coal gasification black ash water sedimentation and dispersion system according to claim 1, wherein: the bottom of the baffling clarifier is connected with a continuous sewage draining device, the middle part of the baffling clarifier is provided with a water inlet, the top of the baffling clarifier is provided with a water outlet, and the water outlet is connected with a water draining pipe.
5. The entrained flow coal gasification black ash water sedimentation and dispersion system according to claim 1, wherein: the flocculation tank I and the flocculation tank II are vacuum flash tanks.
6. The method for settling black grey water by using the entrained flow coal gasification black grey water settling and dispersing system as claimed in any one of claims 1 to 4, wherein: the specific method comprises the following steps:
(1) before the gasification starts, water is firstly supplied to the settling tank, and after the water supply is finished, a settling tank raking machine is started;
(2) preparation of the medicament: adding nonionic polyacrylamide into the flocculant tank I, and adding cationic polyacrylamide into the flocculant tank II, wherein the concentration is 2-3 ppm;
(3) adding a medicament: when the gasification furnace starts to feed coal, a flocculating agent pump I, a flocculating agent pump II and a dispersing agent pump are started, and a dispersing agent and a flocculating agent are added into the system; flocculating agents are added into a flocculating agent tank to a black water pipeline of a settling tank in two stages, and the black water enters the settling tank from a central pipe under the action of the two flocculating agents and is settled in the settling tank;
(4) starting a underflow pump of the settling tank, and pumping black water with high solid content into the latter system; the settled ash water enters a baffling clarifier through an overflow weir;
(5) the grey water enters the deflection clarifier from the middle part of the deflection clarifier, the grey water continues to settle in the deflection clarifier under the action of the original flocculant, the bottom of the deflection clarifier is opened for continuous sewage discharge, the high solid content grey water is continuously discharged from the bottom, the further settled grey water flows out from the top and enters a grey water tank, and a dispersing agent is added on a communication pipeline between the deflection clarifier and the grey water tank.
7. The method for settling black grey water using an entrained flow coal gasification black grey water settling, dispersion system of claim 5, wherein: the grey water discharged from the bottom of the baffle clarifier continuously enters the baffle clarifier for treatment.
8. The method for settling black grey water using an entrained flow coal gasification black grey water settling, dispersion system of claim 5, wherein: and the water in the grey water tank is continuously returned to the system for treatment.
Technical Field
The invention belongs to the technical field of entrained flow coal gasification, and particularly relates to a coal gasification black ash water sedimentation and dispersion system of an entrained flow coal and a black ash water sedimentation method thereof.
Background
The black (grey) water system is the key for long-period and stable operation of entrained flow coal gasification, and the problem of the black (grey) water quality is the key for the operation of the black (grey) water system, so that the control of the black (grey) water quality is very important for gasification operation. Currently, in the sedimentation and dispersion processes of black (grey) water, a flocculating agent and a dispersing agent need to be added respectively so as to respectively improve the sedimentation performance of the black water and the performance of avoiding scaling. However, due to various reasons, the turbidity of the grey water is high, the solid content is high, the equipment and the pipeline are easy to scale, and the stable operation of the gasification system is seriously influenced. For this reason, either the investment or the operating costs are increased by increasing the volume of the settler or by substantially increasing the dosage of flocculant. The original process system adopts the steps of adding a flocculating agent before entering a settling tank, adding a dispersing agent after leaving the settling tank, and then adding an ash water-removing tank. Combining with practical experience of production, provides a settling and dispersing process technology of coal gasification black (ash) water of an entrained flow bed.
Disclosure of Invention
The invention provides a sedimentation and dispersion system for coal gasification black grey water of an entrained flow bed and a black grey water sedimentation method thereof, aiming at improving sedimentation efficiency of coal gasification black water of the entrained flow bed.
The invention is realized by the following technical scheme: a sedimentation and dispersion system for entrained-flow bed coal gasification black grey water comprises a primary flocculant adding device, a secondary flocculant adding device, a sedimentation tank, a deflection clarifier, a dispersing agent adding device and a grey water tank which are sequentially arranged outside a water outlet of a gasification furnace, wherein the primary flocculant adding device is a flocculation tank I connected with a mixer I through a flocculation pump I; the secondary flocculant adding device is characterized in that a flocculation tank II is connected with a mixer II through a flocculation pump II; the mixer I and the mixer II are connected with a black water pipeline of the settling tank, the bottom of the settling tank is connected with a drainage pump, and the top of the settling tank is connected with a water inlet of the baffling clarifier through an overflow weir; the bottom of the baffling clarifier is provided with a sewage discharge outlet, the top of the baffling clarifier is provided with a drain pipe, and the end part of the drain pipe is connected with an ash water tank; and the baffled clarifier is connected with the grey water tank through a dispersant pump.
And the bottom of the settling tank is connected with a filtering device. The filtering device is a band removing filter.
The bottom of the baffling clarifier is connected with a continuous sewage draining device, the middle part of the baffling clarifier is provided with a water inlet, the top of the baffling clarifier is provided with a water outlet, and the water outlet is connected with a water draining pipe.
The flocculation tank I and the flocculation tank II are vacuum flash tanks.
The method for settling the black grey water by utilizing the entrained flow coal gasification black grey water settling and dispersing system comprises the following specific steps:
(1) before the gasification starts, water is firstly supplied to the settling tank, and after the water supply is finished, a settling tank raking machine is started;
(2) preparation of the medicament: adding nonionic polyacrylamide into the flocculant tank I, and adding cationic polyacrylamide into the flocculant tank II, wherein the concentration is 2-3 ppm;
(3) adding a medicament: when the gasification furnace starts to feed coal, a flocculating agent pump I, a flocculating agent pump II and a dispersing agent pump are started, and a dispersing agent and a flocculating agent are added into the system; flocculating agents are added into a flocculating agent tank to a black water pipeline of a settling tank in two stages, the black water enters the settling tank from a central pipe under the action of the two flocculating agents and is settled in the settling tank,
(4) starting a underflow pump of the settling tank, and pumping black water with high solid content into the latter system; the settled ash water enters a baffling clarifier through an overflow weir;
(5) the grey water enters the deflection clarifier from the middle part of the deflection clarifier, the grey water continues to settle in the deflection clarifier under the action of the original flocculant, the bottom of the deflection clarifier is opened for continuous sewage discharge, the high solid content grey water is continuously discharged from the bottom, the further settled grey water flows out from the top and enters a grey water tank, and a dispersing agent is added on a communication pipeline between the deflection clarifier and the grey water tank.
The grey water discharged from the bottom of the baffle clarifier continuously enters the baffle clarifier for treatment.
And continuously returning the water in the ash water tank to the system for treatment until the discharged water reaches a discharge standard and then performing subsequent sewage treatment.
The flocculant is added into a black water pipeline of a settling tank from a vacuum flash tank in two stages, black water enters the settling tank from a central pipe under the action of the two flocculants and is settled in the settling tank, the black water with high solid content at the bottom of the settling tank is sent to the next procedure for treatment by a pump, and settled grey water enters a baffling clarifier through an overflow weir. The grey water enters the baffling clarifier from the middle part of the baffling clarifier, the grey water continues to be settled in the baffling clarifier under the action of the original flocculating agent, continuous pollution discharge is arranged at the bottom, the grey water with high solid content is continuously discharged from the bottom, the further settled grey water flows out from the top and enters a grey water tank, and a dispersing agent is added on a communicating pipeline of the baffling clarifier and the grey water tank.
Different kinds of flocculating agents are added into the two-stage device, so that the purpose of reducing the total dosage of the medicine can be achieved, and the black water can be better settled. The dosage of the medicament is reduced, the sedimentation performance is improved, and the quality of the circulating water is improved.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
in the figure: 1-flocculation tank I; 2-a flocculation pump I; 3-mixer I; 4-flocculation tank II; 5-a flocculation pump II; 6-mixer II; 7-a settling tank; 8-baffled clarifier; 9-ash water tank; 10-a dispersant tank; 11-dispersant pump.
Detailed Description
As shown in fig. 1, the entrained flow coal gasification black grey water settling and dispersing system comprises a primary flocculant adding device, a secondary flocculant adding device, a settling tank 7, a
The bottom of the settling tank is connected with a filtering device to remove the belt filter. The bottom of the baffling clarifier is connected with a continuous sewage discharge device, the middle part of the baffling clarifier is provided with a water inlet, the top of the baffling clarifier is provided with a water outlet, and the water outlet is connected with a drain pipe. The flocculation tank I and the flocculation tank II are vacuum flash tanks.
Under the action of two kinds of flocculant, the black water is fed into the settling tank from central pipe and settled in the settling tank, the high-solid black water at the bottom of the settling tank is pumped into next procedure for treatment, and the settled grey water is fed into baffling clarifier via overflow weir. The ash water enters the baffling clarifier from the middle part of the baffling clarifier, the ash water continues to be settled in the baffling clarifier under the action of the original flocculating agent, the bottom is provided with a continuous sewage discharge device, the ash water with high solid content is continuously discharged from the bottom, the ash water after continuous sewage discharge continues to return to the baffling clarifier for treatment, the ash water after further settlement flows out from the top and enters an ash water tank, and a dispersing agent is added on a communicating pipeline of the baffling clarifier and the ash water tank. And continuously returning the water in the ash water tank to the system for treatment until the discharged water reaches the discharge standard and then performing subsequent sewage treatment.
The method for settling the black grey water by utilizing the entrained flow coal gasification black grey water settling and dispersing system comprises the following specific steps:
(1) before the gasification starts, water is firstly supplied to the settling tank, and after the water supply is finished, a settling tank raking machine is started;
(2) preparation of the medicament: adding nonionic polyacrylamide into the flocculant tank I, and adding cationic polyacrylamide into the flocculant tank II, wherein the concentration is 2-3 ppm;
(3) adding a medicament: when the gasification furnace starts to feed coal, a flocculating agent pump I, a flocculating agent pump II and a dispersing agent pump are started, and a dispersing agent and a flocculating agent are added into the system; flocculating agents are added into a flocculating agent tank to a black water pipeline of a settling tank in two stages, and the black water enters the settling tank from a central pipe under the action of the two flocculating agents and is settled in the settling tank;
(4) starting a underflow pump of the settling tank, and pumping black water with high solid content into the latter system; the settled ash water enters a baffling clarifier through an overflow weir;
(5) the grey water enters the deflection clarifier from the middle part of the deflection clarifier, the grey water continues to settle in the deflection clarifier under the action of the original flocculant, the bottom of the deflection clarifier is opened for continuous sewage discharge, the grey water with high solid content is continuously discharged from the bottom, the further settled grey water flows out from the top and enters a grey water tank, and a dispersing agent is added on a communication pipeline between the deflection clarifier and the grey water tank.
The grey water discharged from the bottom of the baffle clarifier continuously enters the baffle clarifier for treatment. The water in the grey water tank continues to return to the system for treatment.
The flocculating agent is added into a black water pipeline of the sedimentation tank from the vacuum flash tank in two stages, the black water enters the sedimentation tank from the central pipe under the action of the two flocculating agents and is settled in the sedimentation tank, the black water with high solid content at the bottom of the sedimentation tank is pumped into the next procedure for treatment, and the settled grey water enters the baffling clarifier through the overflow weir. The ash water enters the baffling clarifier from the middle part of the baffling clarifier, the ash water continues to be settled in the baffling clarifier under the action of the original flocculating agent, the bottom is provided with a continuous sewage discharge device, the ash water with high solid content is continuously discharged from the bottom, the ash water after continuous sewage discharge continues to return to the baffling clarifier for treatment, the ash water after further settlement flows out from the top and enters an ash water tank, and a dispersing agent is added on a communicating pipeline of the baffling clarifier and the ash water tank. And continuously returning the water in the ash water tank to the system for treatment until the discharged water reaches the discharge standard and then performing subsequent sewage treatment.
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