GB/T 18916.34-2018Norm of water intake—Part 34: Direct coal liquefaction (English PDF)

3.1 Direct Coal Liquefaction

Direct coal liquefaction refers to the process technology of coal's direct conversion into liquid products through hydrogenation reaction under the effect of catalyst, and the condition of high temperature, high pressure and hydrogenation.

3.2 Quantity of Water Intake for Per Ton Hydrocarbon

Quantity of water intake for per ton hydrocarbon refers to the ratio of the quantity of water that direct coal liquefaction enterprises extract from various conventional water resources to the total output of petroleum products (hydrocarbon products) during the production process within a certain measuring time.

4.1 General Stipulations

4.1.1 Scope of water intake

Range of water intake refers to the quantity of water that enterprises extract from various conventional water resources, including water extracted from surface water (calculated by water supply from water purification plants), underground water, water supply engineering in cities and towns, and other water or water products (such as steam, hot water and geothermal water, etc.) that enterprises purchase from the market.

4.1.2 Range of water intake supply

Range of water intake supply for direct coal liquefaction includes primary production [including coal preparation, catalyst preparation, direct coal liquefaction, hydrogenation stabilization (solvent hydrogenation), hydrogenation upgrading, light hydrocarbon recovery, Sulphur-containing sewage stripping, desulfurization, sulfur recovery, phenol recovery, oil residue forming, coal hydrogen production, air separation and reorganization, etc.], auxiliary production (including power supply, machine maintenance, water supply and gas supply, etc.) and subsidiary production (including office, testing, maintenance, plant canteen, bathroom and toilet, etc.), excluding self-supplied power station (power center), product deep-processing unit and living area facilities.

4.1.3 Measuring of water intake

The quantity of water intake shall be measured with enterprises' Level-1 measuring table.

4.2 Quantity of Water Intake for Direct Coal Liquefaction

The quantity of water intake for direct coal liquefaction shall be calculated in accordance with Formula (1). Where.

Vin---quantity of water intake for direct coal liquefaction, expressed in (m3);

Vtin---quantity of water intake for self-constructed water supply facilities, expressed in (m3);

Vob---quantity of water purchased from external sources, expressed in (m3);

Vos---quantity of water supplied by external sources, expressed in (m3).

4.3 Quantity of Water Intake for Per Ton Hydrocarbon

The quantity of water intake for per ton hydrocarbon shall be calculated in accordance with Formula (2). Where.

Vui---quantity of water intake for per ton hydrocarbon, expressed in (m3/t);

Vin---within a certain measuring time, quantity of water intake for direct coal liquefaction, expressed in (m3);

W---within corresponding measuring time, output of petroleum products from direct coal liquefaction, expressed in (t).

5.1 Water Intake Norm of Existing Enterprises

The norm of water intake of existing enterprises in the production of petroleum products from direct coal liquefaction shall be not more than 6.5 m³/t.

5.2 Water Intake Norm of Newly Constructed, Reorganized and Expanded Enterprises

The norm of water intake of newly constructed, reorganized and expanded enterprises in the production of petroleum products from direct coal liquefaction shall be not more than 6.2 m³/t.

5.3 Water Intake Norm of Advanced Enterprises

The norm of water intake of advanced enterprises in the production of petroleum products from direct coal liquefaction shall be not more than 6.2 m³/t.

A.1 Calculation of Quantity of Water Purchased from External Sources

The quantity of water purchased from external sources shall be calculated in accordance with Formula (A.1). Where.

Vob---quantity of water purchased from external sources, expressed in (m3);

Vinb---quantity of water intake purchased from external sources, expressed in (m3);

k1---softened water and demineralized water preparation (conversion) coefficient (please refer to Appendix B for the calculation);

Vchb---quantity of chemical water purchased from external sources, expressed in (m3);

k2---steam preparation (conversion) coefficient (please refer to Appendix B for the calculation);

Dstb---quantity of steam purchased from external sources, expressed in (t);

rho---water density, expressed in (t/m3) (water density shall be calculated as 1 t/m3)).

A.2 Calculation of Quantity of Water Supplied by External Sources

The quantity of water supplied by external sources shall be calculated in accordance with Formula (A.2). Where.

Vos---quantity of water supplied by external sources, expressed in (m3);

Vinb---quantity of water intake supplied by external sources, expressed in (m3);

k1---softened water and demineralized water preparation (conversion) coefficient (please refer to Appendix B for the calculation);

Vchs---quantity of chemical water supplied by external sources, expressed in (m3);

k2---steam preparation (conversion) coefficient (please refer to Appendix B for the calculation);

Dsts---quantity of steam supplied by external sources, expressed in (t);

rho---water density, expressed in (t/m3) (water density shall be calculated as 1 t/m3).

B.1 Softened Water and Demineralized Water Preparation (conversion) Coefficient

The coefficient of converting the quantity of softened water and demineralized water into the quantity of water intake shall be calculated in accordance with Formula (B.1). Where.

k1---conversion coefficient of softened water and demineralized water;

Vcin---quantity of water intake for the preparation of softened water and demineralized water (quantity of water intake that is converted from the quantity of softened water and demineralized water), expressed in (m3);

Vcn---quantity of softened water and demineralized water, expressed in (m3).

B.2 Steam Preparation (conversion) Coefficient

The coefficient of converting the quantity of steam into the quantity of water intake shall be calculated in accordance with Formula (B.2).

Where.

k1---conversion coefficient of softened water and demineralized water;

k2---steam conversion coefficient;

Vsin---quantity of water intake for steam preparation (the quantity of steam that is converted into the quantity of water intake), expressed in (m3);

Dst---output of steam, expressed in (t);

rho---water density, expressed in (t/m3) (water density shall be calculated as 1 t/m3);

Vich---quantity of softened water and demineralized water for steam preparation (excluding condensate recovery), expressed in (m3).

NOTE: when there is no calculation data, the conversion coefficient can be calculated as 1.15. […]