CN112320974A

CN112320974A - Raw salt dissolving system for coal gasification ash water hardness removal device

Info

Publication number: CN112320974A
Application number: CN202011204421.8A
Authority: CN
Inventors: 孙世岩; 马艳军; 刘彦文; 霍震霆; 石炜鑫
Original assignee: Hengli Petrochemical Dalian Refining Co Ltd
Current assignee: Hengli Petrochemical Dalian Refining Co Ltd
Priority date: 2020-11-02
Filing date: 2020-11-02
Publication date: 2021-02-05

Abstract

The invention provides a raw salt dissolving system for a coal gasification grey water hardness removal device. The system comprises a multistage salt pond, wherein a first-stage salt pond is used for preparing saturated brine, a second-stage salt pond is used for precipitating the saturated brine, and a third-stage salt pond is used for conveying the saturated brine to a coal gasification grey water hardness removal device. The saturated saline water is conveyed from the first-level salt pond to the second-level salt pond in an overflow mode, and is conveyed from the second-level salt pond to the third-level salt pond. In the operation process of the salt dissolving pool, the salt solution overflowing to the third-level pool is always in a saturated state by controlling the adding amount of the raw salt and the water in the salt dissolving pool, the concentration of the salt solution can be ensured, the workload and the number of personnel for preparing the salt solution can be reduced, and meanwhile, the water used for preparing the salt is the recovered water and the produced water of the hardness removing device, so that the consumption is not increased.

Description

Raw salt dissolving system for coal gasification ash water hardness removal device

Technical Field

The invention relates to the technical field of coal water slurry gasification, in particular to a raw salt dissolving system used for a coal gasification grey water hardness removal device.

Background

The coal water slurry gasification technology is characterized in that coal is used as a raw material, the coal water slurry is prepared into coal water slurry, the coal water slurry and oxygen are mixed through a special process burner and then are sprayed into a gasification furnace for gasification reaction, and CO is generated₂And H₂The water gas, which is the main component, needs to be washed with water to reduce the temperature and remove dust because the water gas has a high temperature and contains a large amount of dust. Water is like blood in the field of coal water slurry gasification, needs to be supplied continuously, is very high in consumption, in order to save water, a gasification device precipitates and filters washed water for reuse, the water after precipitation and filtration is called as grey water, therefore, Ca ions in raw material coal can be accumulated continuously in the water, the hardness in the grey water is increased continuously, and equipment and pipelines can generate CaCO gradually₃And precipitation affects long-term operation of the system.

Disclosure of Invention

In view of the above-mentioned problems, a raw salt dissolving system for a coal gasification grey water hardness removal device is provided. The technical means adopted by the invention are as follows:

a raw salt dissolving system used by a coal gasification grey water hardness removal device comprises a multi-stage salt pond, wherein a primary salt pond is used for preparing saturated brine, a secondary salt pond is used for precipitating the saturated brine, and a tertiary salt pond is used for conveying the saturated brine to the coal gasification grey water hardness removal device.

Further, the first-stage salt pond, the second-stage salt pond and the third-stage salt pond are all underground ponds.

Further, the first-level salt pond, the second-level salt pond and the third-level salt pond are sequentially arranged, separation mechanisms are arranged between the first-level salt pond and the second-level salt pond and between the second-level salt pond and the third-level salt pond, saturated salt water is conveyed to the second-level salt pond from the first-level salt pond in an overflow mode, and is conveyed to the third-level salt pond from the second-level salt pond.

Furthermore, a raw salt feeding port is arranged at the primary salt pond, and a water inlet is also arranged at the primary salt pond and is connected with a reclaimed water outlet of the hardness removal device.

Further, the bottom of each salt pond is provided with an aeration pipe.

The invention has the following advantages: in the operation of salt dissolving pond in-process, through the addition of the interior raw salt of control salt dissolving pond and water, guarantee that the overflow is the saturated condition all the time to tertiary pond salt solution, can guarantee salt solution concentration, reduce configuration salt solution personnel work load and personnel's quantity, simultaneously, the water that joins in marriage the salt and use is the recovery water and the product water that removes hard device, does not increase the consumption.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the structure of the present invention.

In the figure: 1. a first-stage salt pond; 2. a secondary salt pond; 3. a third-stage salt pond; 4. an aeration pipe; 5. a pump; 6. a pump water inlet pipe; 7. a pump-out water pipe; 8. an air inlet pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in figure 1, the invention discloses a raw salt dissolving system used for a coal gasification grey water hardness removal device, which uses an adsorption principle, Na ions in NaCL are adsorbed by an adsorbent, Ca ions in the grey water are exchanged with Na ions by the adsorbent, and the Ca ions in the grey water are removed to achieve the purpose of hardness removal. This process requires continuous replenishment of aqueous NaCL solution, which is consumed in amounts of about 20 tons per day, with a corresponding increase in the salination underground pond in order to make up such large quantities of aqueous NaCL solution.

The crude salt dissolving system comprises a multi-stage salt pond, wherein the primary salt pond is used for preparing saturated brine, the secondary salt pond is used for precipitating the saturated brine, and the tertiary salt pond is used for conveying the saturated brine to the coal gasification grey water hardness removal device. The first-stage salt pond, the second-stage salt pond and the third-stage salt pond are all underground ponds.

The one-level salt pond 1, the second-level salt pond 2 and the third-level salt pond 3 are arranged in sequence, separation mechanisms are arranged between the one-level salt pond and the second-level salt pond and between the second-level salt pond and the third-level salt pond, saturated salt water is conveyed to the second-level salt pond from the one-level salt pond in an overflowing mode, and is conveyed to the third-level salt pond from the second-level salt pond. In this embodiment, the primary tank is 3.2 meters long, 4.4 meters wide, and 3.3 meters deep; the length of the secondary pool is 1 meter, the width is 4.4 meters, and the depth is 2.7 meters; the third-stage pool is 2.4 meters long, 4.4 meters wide and 3.3 meters deep.

The primary salt pond is provided with a raw salt feeding port and a water inlet, and the water inlet is connected with a recycled water outlet of the hardness removal device.

The bottom of each salt pond is provided with an aeration pipe 4, and aeration is carried out to the aeration pipe 4 through an air inlet pipe 8 according to preset indexes.

The primary salt to be dissolved is poured into the primary salt dissolving pool, the salt in the primary pool is dissolved to prepare saturated salt water, the saturated salt water overflows into the secondary pool, undissolved salt is precipitated in the secondary pool, the saturated salt water after secondary precipitation overflows into the tertiary pool again, and the saturated salt water is sent into the hardness removing device through the pump 5, wherein the water inlet pipe 6 of the pump is connected into the tertiary salt pool, and the water outlet pipe 7 of the pump is connected with the water inlet of the hardness removing device.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A raw salt dissolving system used by a coal gasification grey water hardness removal device is characterized by comprising a multi-stage salt pond, wherein a first-stage salt pond is used for preparing saturated brine, a second-stage salt pond is used for precipitating the saturated brine, and a third-stage salt pond is used for conveying the saturated brine to the coal gasification grey water hardness removal device.

2. The raw salt dissolving system for use in the coal gasification grey water hardness removal apparatus of claim 1, wherein the primary salt pond, the secondary salt pond, and the tertiary salt pond are all underground ponds.

3. The raw salt dissolving system for the coal gasification grey water hardness removal device according to claim 1, wherein the primary salt pond, the secondary salt pond and the tertiary salt pond are arranged in sequence, blocking mechanisms are arranged between the primary salt pond and the secondary salt pond and between the secondary salt pond and the tertiary salt pond, and saturated brine is conveyed from the primary salt pond to the secondary salt pond and from the secondary salt pond to the tertiary salt pond in an overflow mode.

4. The raw salt dissolving system for the coal gasification grey water hardness removal device according to claim 1, wherein a raw salt feeding port is arranged at the primary salt pond, and a water inlet is further arranged at the primary salt pond and is connected with a recovered water outlet of the hardness removal device.

5. The raw salt dissolving system for the coal gasification grey water hardness removal device according to claim 1, wherein the bottom of each salt pond is provided with an aeration pipe.